summaryrefslogtreecommitdiffstats
path: root/Bugzilla/Bug.pm
blob: b4e8c361a574e74a6fec8b497d3507aad2410a56 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.

package Bugzilla::Bug;

use 5.10.1;
use strict;

use Bugzilla::Attachment;
use Bugzilla::Constants;
use Bugzilla::Field;
use Bugzilla::Flag;
use Bugzilla::FlagType;
use Bugzilla::Hook;
use Bugzilla::Keyword;
use Bugzilla::Milestone;
use Bugzilla::User;
use Bugzilla::Util;
use Bugzilla::Version;
use Bugzilla::Error;
use Bugzilla::Product;
use Bugzilla::Component;
use Bugzilla::Group;
use Bugzilla::Status;
use Bugzilla::Comment;
use Bugzilla::BugUrl;

use List::MoreUtils qw(firstidx uniq part);
use List::Util qw(min max first);
use Storable qw(dclone);
use URI;
use URI::QueryParam;
use Scalar::Util qw(blessed);

use parent qw(Bugzilla::Object Exporter);
@Bugzilla::Bug::EXPORT = qw(
    bug_alias_to_id
    LogActivityEntry
    editable_bug_fields
);

#####################################################################
# Constants
#####################################################################

use constant DB_TABLE   => 'bugs';
use constant ID_FIELD   => 'bug_id';
use constant NAME_FIELD => 'alias';
use constant LIST_ORDER => ID_FIELD;
# Bugs have their own auditing table, bugs_activity.
use constant AUDIT_CREATES => 0;
use constant AUDIT_UPDATES => 0;

# This is a sub because it needs to call other subroutines.
sub DB_COLUMNS {
    my $dbh = Bugzilla->dbh;
    my @custom = grep {$_->type != FIELD_TYPE_MULTI_SELECT}
                      Bugzilla->active_custom_fields;
    my @custom_names = map {$_->name} @custom;

    my @columns = (qw(
        alias
        assigned_to
        bug_file_loc
        bug_id
        bug_severity
        bug_status
        cclist_accessible
        component_id
        creation_ts
        delta_ts
        estimated_time
        everconfirmed
        lastdiffed
        op_sys
        priority
        product_id
        qa_contact
        remaining_time
        rep_platform
        reporter_accessible
        resolution
        short_desc
        status_whiteboard
        target_milestone
        version
    ),
    'reporter    AS reporter_id',
    $dbh->sql_date_format('deadline', '%Y-%m-%d') . ' AS deadline',
    @custom_names);
    
    Bugzilla::Hook::process("bug_columns", { columns => \@columns });
    
    return @columns;
}

sub VALIDATORS {

    my $validators = {
        alias          => \&_check_alias,
        assigned_to    => \&_check_assigned_to,
        blocked        => \&_check_dependencies,
        bug_file_loc   => \&_check_bug_file_loc,
        bug_severity   => \&_check_select_field,
        bug_status     => \&_check_bug_status,
        cc             => \&_check_cc,
        comment        => \&_check_comment,
        component      => \&_check_component,
        creation_ts    => \&_check_creation_ts,
        deadline       => \&_check_deadline,
        dependson      => \&_check_dependencies,
        dup_id         => \&_check_dup_id,
        estimated_time => \&_check_time_field,
        everconfirmed  => \&Bugzilla::Object::check_boolean,
        groups         => \&_check_groups,
        keywords       => \&_check_keywords,
        op_sys         => \&_check_select_field,
        priority       => \&_check_priority,
        product        => \&_check_product,
        qa_contact     => \&_check_qa_contact,
        remaining_time => \&_check_time_field,
        rep_platform   => \&_check_select_field,
        resolution     => \&_check_resolution,
        short_desc     => \&_check_short_desc,
        status_whiteboard => \&_check_status_whiteboard,
        target_milestone  => \&_check_target_milestone,
        version           => \&_check_version,

        cclist_accessible   => \&Bugzilla::Object::check_boolean,
        reporter_accessible => \&Bugzilla::Object::check_boolean,
    };

    # Set up validators for custom fields.    
    foreach my $field (Bugzilla->active_custom_fields) {
        my $validator;
        if ($field->type == FIELD_TYPE_SINGLE_SELECT) {
            $validator = \&_check_select_field;
        }
        elsif ($field->type == FIELD_TYPE_MULTI_SELECT) {
            $validator = \&_check_multi_select_field;
        }
        elsif ($field->type == FIELD_TYPE_DATETIME) {
            $validator = \&_check_datetime_field;
        }
        elsif ($field->type == FIELD_TYPE_DATE) {
            $validator = \&_check_date_field;
        }
        elsif ($field->type == FIELD_TYPE_FREETEXT) {
            $validator = \&_check_freetext_field;
        }
        elsif ($field->type == FIELD_TYPE_BUG_ID) {
            $validator = \&_check_bugid_field;
        }
        elsif ($field->type == FIELD_TYPE_TEXTAREA) {
            $validator = \&_check_textarea_field;
        }
        else {
            $validator = \&_check_default_field;
        }
        $validators->{$field->name} = $validator;
    }

    return $validators;
};

sub VALIDATOR_DEPENDENCIES {
    my $cache = Bugzilla->request_cache;
    return $cache->{bug_validator_dependencies} 
        if $cache->{bug_validator_dependencies};

    my %deps = (
        assigned_to      => ['component'],
        blocked          => ['product'],
        bug_status       => ['product', 'comment', 'target_milestone'],
        cc               => ['component'],
        comment          => ['creation_ts'],
        component        => ['product'],
        dependson        => ['product'],
        dup_id           => ['bug_status', 'resolution'],
        groups           => ['product'],
        keywords         => ['product'],
        resolution       => ['bug_status', 'dependson'],
        qa_contact       => ['component'],
        target_milestone => ['product'],
        version          => ['product'],
    );

    foreach my $field (@{ Bugzilla->fields }) {
        $deps{$field->name} = [ $field->visibility_field->name ]
            if $field->{visibility_field_id};
    }

    $cache->{bug_validator_dependencies} = \%deps;
    return \%deps;
};

sub UPDATE_COLUMNS {
    my @custom = grep {$_->type != FIELD_TYPE_MULTI_SELECT}
                      Bugzilla->active_custom_fields;
    my @custom_names = map {$_->name} @custom;
    my @columns = qw(
        alias
        assigned_to
        bug_file_loc
        bug_severity
        bug_status
        cclist_accessible
        component_id
        deadline
        estimated_time
        everconfirmed
        op_sys
        priority
        product_id
        qa_contact
        remaining_time
        rep_platform
        reporter_accessible
        resolution
        short_desc
        status_whiteboard
        target_milestone
        version
    );
    push(@columns, @custom_names);
    return @columns;
};

use constant NUMERIC_COLUMNS => qw(
    estimated_time
    remaining_time
);

sub DATE_COLUMNS {
    my @fields = (@{ Bugzilla->fields({ type => [FIELD_TYPE_DATETIME,
                                                 FIELD_TYPE_DATE] })
                   });
    return map { $_->name } @fields;
}

# Used in LogActivityEntry(). Gives the max length of lines in the
# activity table.
use constant MAX_LINE_LENGTH => 254;

# This maps the names of internal Bugzilla bug fields to things that would
# make sense to somebody who's not intimately familiar with the inner workings
# of Bugzilla. (These are the field names that the WebService and email_in.pl
# use.)
use constant FIELD_MAP => {
    blocks           => 'blocked',
    cc_accessible    => 'cclist_accessible',
    commentprivacy   => 'comment_is_private',
    creation_time    => 'creation_ts',
    creator          => 'reporter',
    description      => 'comment',
    depends_on       => 'dependson',
    dupe_of          => 'dup_id',
    id               => 'bug_id',
    is_confirmed     => 'everconfirmed',
    is_cc_accessible => 'cclist_accessible',
    is_creator_accessible => 'reporter_accessible',
    last_change_time => 'delta_ts',
    platform         => 'rep_platform',
    severity         => 'bug_severity',
    status           => 'bug_status',
    summary          => 'short_desc',
    url              => 'bug_file_loc',
    whiteboard       => 'status_whiteboard',
};

use constant REQUIRED_FIELD_MAP => {
    product_id   => 'product',
    component_id => 'component',
};

# Creation timestamp is here because it needs to be validated
# but it can be NULL in the database (see comments in create above)
#
# Target Milestone is here because it has a default that the validator
# creates (product.defaultmilestone) that is different from the database
# default.
#
# CC is here because it is a separate table, and has a validator-created
# default of the component initialcc.
#
# QA Contact is allowed to be NULL in the database, so it wouldn't normally
# be caught by _required_create_fields. However, it always has to be validated,
# because it has a default of the component.defaultqacontact.
#
# Groups are in a separate table, but must always be validated so that
# mandatory groups get set on bugs.
use constant EXTRA_REQUIRED_FIELDS => qw(creation_ts target_milestone cc qa_contact groups);

#####################################################################

sub new {
    my $invocant = shift;
    my $class = ref($invocant) || $invocant;
    my $param = shift;

    # Remove leading "#" mark if we've just been passed an id.
    if (!ref $param && $param =~ /^#(\d+)$/) {
        $param = $1;
    }

    # If we get something that looks like a word (not a number),
    # make it the "name" param.
    if (!defined $param
        || (!ref($param) && $param =~ /\D/)
        || (ref($param) && $param->{id} =~ /\D/))
    {
        if ($param) {
            $param = { name => ref($param) ? $param->{id} : $param,
                       cache => ref($param) ? $param->{cache} : 0 };
        }
        else {
            # We got something that's not a number.
            my $error_self = {};
            bless $error_self, $class;
            $error_self->{'bug_id'} = $param;
            $error_self->{'error'}  = 'InvalidBugId';
            return $error_self;
        }
    }

    unshift @_, $param;
    my $self = $class->SUPER::new(@_);

    # Bugzilla::Bug->new always returns something, but sets $self->{error}
    # if the bug wasn't found in the database.
    if (!$self) {
        my $error_self = {};
        if (ref $param) {
            $error_self->{bug_id} = $param->{name};
            $error_self->{error}  = 'InvalidBugId';
        }
        else {
            $error_self->{bug_id} = $param;
            $error_self->{error}  = 'NotFound';
        }
        bless $error_self, $class;
        return $error_self;
    }

    return $self;
}

sub initialize {
    $_[0]->_create_cf_accessors();
}

sub object_cache_key {
    my $class = shift;
    my $key = $class->SUPER::object_cache_key(@_)
      || return;
    return $key . ',' . Bugzilla->user->id;
}

sub check {
    my $class = shift;
    my ($param, $field) = @_;

    # Bugzilla::Bug throws lots of special errors, so we don't call
    # SUPER::check, we just call our new and do our own checks.
    my $id = ref($param)
        ? ($param->{id} = trim($param->{id}))
        : ($param = trim($param));
    ThrowUserError('improper_bug_id_field_value', { field => $field }) unless defined $id;

    my $self = $class->new($param);

    if ($self->{error}) {
        # For error messages, use the id that was returned by new(), because
        # it's cleaned up.
        $id = $self->id;

        if ($self->{error} eq 'NotFound') {
             ThrowUserError("bug_id_does_not_exist", { bug_id => $id });
        }
        if ($self->{error} eq 'InvalidBugId') {
            ThrowUserError("improper_bug_id_field_value",
                              { bug_id => $id,
                                field  => $field });
        }
    }

    unless ($field && $field =~ /^(dependson|blocked|dup_id)$/) {
        $self->check_is_visible($id);
    }
    return $self;
}

sub check_for_edit {
    my $class = shift;
    my $bug = $class->check(@_);

    Bugzilla->user->can_edit_product($bug->product_id)
        || ThrowUserError("product_edit_denied", { product => $bug->product });

    return $bug;
}

sub check_is_visible {
    my ($self, $input_id) = @_;
    $input_id ||= $self->id;
    my $user = Bugzilla->user;

    if (!$user->can_see_bug($self->id)) {
        # The error the user sees depends on whether or not they are
        # logged in (i.e. $user->id contains the user's positive integer ID).
        # If we are validating an alias, then use it in the error message
        # instead of its corresponding bug ID, to not disclose it.
        if ($user->id) {
            ThrowUserError("bug_access_denied", { bug_id => $input_id });
        } else {
            ThrowUserError("bug_access_query", { bug_id => $input_id });
        }
    }
}

sub match {
    my $class = shift;
    my ($params) = @_;

    # Allow matching certain fields by name (in addition to matching by ID).
    my %translate_fields = (
        assigned_to => 'Bugzilla::User',
        qa_contact  => 'Bugzilla::User',
        reporter    => 'Bugzilla::User',
        product     => 'Bugzilla::Product',
        component   => 'Bugzilla::Component',
    );
    my %translated;

    foreach my $field (keys %translate_fields) {
        my @ids;
        # Convert names to ids. We use "exists" everywhere since people can
        # legally specify "undef" to mean IS NULL (even though most of these
        # fields can't be NULL, people can still specify it...).
        if (exists $params->{$field}) {
            my $names = $params->{$field};
            my $type = $translate_fields{$field};
            my $param = $type eq 'Bugzilla::User' ? 'login_name' : 'name';
            # We call Bugzilla::Object::match directly to avoid the
            # Bugzilla::User::match implementation which is different.
            my $objects = Bugzilla::Object::match($type, { $param => $names });
            push(@ids, map { $_->id } @$objects);
        }
        # You can also specify ids directly as arguments to this function,
        # so include them in the list if they have been specified.
        if (exists $params->{"${field}_id"}) {
            my $current_ids = $params->{"${field}_id"};
            my @id_array = ref $current_ids ? @$current_ids : ($current_ids);
            push(@ids, @id_array);
        }
        # We do this "or" instead of a "scalar(@ids)" to handle the case
        # when people passed only invalid object names. Otherwise we'd
        # end up with a SUPER::match call with zero criteria (which dies).
        if (exists $params->{$field} or exists $params->{"${field}_id"}) {
            $translated{$field} = scalar(@ids) == 1 ? $ids[0] : \@ids;
        }
    }

    # The user fields don't have an _id on the end of them in the database,
    # but the product & component fields do, so we have to have separate
    # code to deal with the different sets of fields here.
    foreach my $field (qw(assigned_to qa_contact reporter)) {
        delete $params->{"${field}_id"};
        $params->{$field} = $translated{$field} 
            if exists $translated{$field};
    }
    foreach my $field (qw(product component)) {
        delete $params->{$field};
        $params->{"${field}_id"} = $translated{$field} 
            if exists $translated{$field};
    }

    return $class->SUPER::match(@_);
}

# Helps load up information for bugs for show_bug.cgi and other situations
# that will need to access info on lots of bugs.
sub preload {
    my ($class, $bugs) = @_;
    my $user = Bugzilla->user;

    # It would be faster but MUCH more complicated to select all the
    # deps for the entire list in one SQL statement. If we ever have
    # a profile that proves that that's necessary, we can switch over
    # to the more complex method.
    my @all_dep_ids;
    foreach my $bug (@$bugs) {
        push(@all_dep_ids, @{ $bug->blocked }, @{ $bug->dependson });
        push(@all_dep_ids, @{ $bug->duplicate_ids });
    }
    @all_dep_ids = uniq @all_dep_ids;
    # If we don't do this, can_see_bug will do one call per bug in
    # the dependency and duplicate lists, in Bugzilla::Template::get_bug_link.
    $user->visible_bugs(\@all_dep_ids);
}

sub possible_duplicates {
    my ($class, $params) = @_;
    my $short_desc = $params->{summary};
    my $products = $params->{products} || [];
    my $limit = $params->{limit} || MAX_POSSIBLE_DUPLICATES;
    $limit = MAX_POSSIBLE_DUPLICATES if $limit > MAX_POSSIBLE_DUPLICATES;
    $products = [$products] if !ref($products) eq 'ARRAY';

    my $orig_limit = $limit;
    detaint_natural($limit) 
        || ThrowCodeError('param_must_be_numeric', 
                          { function => 'possible_duplicates',
                            param    => $orig_limit });

    my $dbh = Bugzilla->dbh;
    my $user = Bugzilla->user;
    my @words = split(/[\b\s]+/, $short_desc || '');
    # Exclude punctuation from the array.
    @words = map { /(\w+)/; $1 } @words;
    # And make sure that each word is longer than 2 characters.
    @words = grep { defined $_ and length($_) > 2 } @words;

    return [] if !@words;

    my ($where_sql, $relevance_sql);
    if ($dbh->FULLTEXT_OR) {
        my $joined_terms = join($dbh->FULLTEXT_OR, @words);
        ($where_sql, $relevance_sql) = 
            $dbh->sql_fulltext_search('bugs_fulltext.short_desc', $joined_terms);
        $relevance_sql ||= $where_sql;
    }
    else {
        my (@where, @relevance);
        foreach my $word (@words) {
            my ($term, $rel_term) = $dbh->sql_fulltext_search(
                'bugs_fulltext.short_desc', $word);
            push(@where, $term);
            push(@relevance, $rel_term || $term);
        }

        $where_sql = join(' OR ', @where);
        $relevance_sql = join(' + ', @relevance);
    }

    my $product_ids = join(',', map { $_->id } @$products);
    my $product_sql = $product_ids ? "AND product_id IN ($product_ids)" : "";

    # Because we collapse duplicates, we want to get slightly more bugs
    # than were actually asked for.
    my $sql_limit = $limit + 5;

    my $possible_dupes = $dbh->selectall_arrayref(
        "SELECT bugs.bug_id AS bug_id, bugs.resolution AS resolution,
                ($relevance_sql) AS relevance
           FROM bugs
                INNER JOIN bugs_fulltext ON bugs.bug_id = bugs_fulltext.bug_id
          WHERE ($where_sql) $product_sql
       ORDER BY relevance DESC, bug_id DESC " .
          $dbh->sql_limit($sql_limit), {Slice=>{}});

    my @actual_dupe_ids;
    # Resolve duplicates into their ultimate target duplicates.
    foreach my $bug (@$possible_dupes) {
        my $push_id = $bug->{bug_id};
        if ($bug->{resolution} && $bug->{resolution} eq 'DUPLICATE') {
            $push_id = _resolve_ultimate_dup_id($bug->{bug_id});
        }
        push(@actual_dupe_ids, $push_id);
    }
    @actual_dupe_ids = uniq @actual_dupe_ids;
    if (scalar @actual_dupe_ids > $limit) {
        @actual_dupe_ids = @actual_dupe_ids[0..($limit-1)];
    }

    my $visible = $user->visible_bugs(\@actual_dupe_ids);
    return $class->new_from_list($visible);
}

# Docs for create() (there's no POD in this file yet, but we very
# much need this documented right now):
#
# The same as Bugzilla::Object->create. Parameters are only required
# if they say so below.
#
# Params:
#
# C<product>     - B<Required> The name of the product this bug is being
#                  filed against.
# C<component>   - B<Required> The name of the component this bug is being
#                  filed against.
#
# C<bug_severity> - B<Required> The severity for the bug, a string.
# C<creation_ts>  - B<Required> A SQL timestamp for when the bug was created.
# C<short_desc>   - B<Required> A summary for the bug.
# C<op_sys>       - B<Required> The OS the bug was found against.
# C<priority>     - B<Required> The initial priority for the bug.
# C<rep_platform> - B<Required> The platform the bug was found against.
# C<version>      - B<Required> The version of the product the bug was found in.
#
# C<alias>        - An alias for this bug.
# C<target_milestone> - When this bug is expected to be fixed.
# C<status_whiteboard> - A string.
# C<bug_status>   - The initial status of the bug, a string.
# C<bug_file_loc> - The URL field.
#
# C<assigned_to> - The full login name of the user who the bug is
#                  initially assigned to.
# C<qa_contact>  - The full login name of the QA Contact for this bug. 
#                  Will be ignored if C<useqacontact> is off.
#
# C<estimated_time> - For time-tracking. Will be ignored if 
#                     C<timetrackinggroup> is not set, or if the current
#                     user is not a member of the timetrackinggroup.
# C<deadline>       - For time-tracking. Will be ignored for the same
#                     reasons as C<estimated_time>.
sub create {
    my ($class, $params) = @_;
    my $dbh = Bugzilla->dbh;

    $dbh->bz_start_transaction();

    # These fields have default values which we can use if they are undefined.
    $params->{bug_severity} = Bugzilla->params->{defaultseverity}
      unless defined $params->{bug_severity};
    $params->{priority} = Bugzilla->params->{defaultpriority}
      unless defined $params->{priority};
    $params->{op_sys} = Bugzilla->params->{defaultopsys}
      unless defined $params->{op_sys};
    $params->{rep_platform} = Bugzilla->params->{defaultplatform}
      unless defined $params->{rep_platform};
    # Make sure a comment is always defined.
    $params->{comment} = '' unless defined $params->{comment};

    $class->check_required_create_fields($params);
    $params = $class->run_create_validators($params);

    # These are not a fields in the bugs table, so we don't pass them to
    # insert_create_data.
    my $cc_ids           = delete $params->{cc};
    my $groups           = delete $params->{groups};
    my $depends_on       = delete $params->{dependson};
    my $blocked          = delete $params->{blocked};
    my $keywords         = delete $params->{keywords};
    my $creation_comment = delete $params->{comment};

    # We don't want the bug to appear in the system until it's correctly
    # protected by groups.
    my $timestamp = delete $params->{creation_ts}; 

    my $ms_values = $class->_extract_multi_selects($params);
    my $bug = $class->insert_create_data($params);

    # Add the group restrictions
    my $sth_group = $dbh->prepare(
        'INSERT INTO bug_group_map (bug_id, group_id) VALUES (?, ?)');
    foreach my $group (@$groups) {
        $sth_group->execute($bug->bug_id, $group->id);
    }

    $dbh->do('UPDATE bugs SET creation_ts = ? WHERE bug_id = ?', undef,
             $timestamp, $bug->bug_id);
    # Update the bug instance as well
    $bug->{creation_ts} = $timestamp;

    # Add the CCs
    my $sth_cc = $dbh->prepare('INSERT INTO cc (bug_id, who) VALUES (?,?)');
    foreach my $user_id (@$cc_ids) {
        $sth_cc->execute($bug->bug_id, $user_id);
    }

    # Add in keywords
    my $sth_keyword = $dbh->prepare(
        'INSERT INTO keywords (bug_id, keywordid) VALUES (?, ?)');
    foreach my $keyword_id (map($_->id, @$keywords)) {
        $sth_keyword->execute($bug->bug_id, $keyword_id);
    }

    # Set up dependencies (blocked/dependson)
    my $sth_deps = $dbh->prepare(
        'INSERT INTO dependencies (blocked, dependson) VALUES (?, ?)');
    my $sth_bug_time = $dbh->prepare('UPDATE bugs SET delta_ts = ? WHERE bug_id = ?');

    foreach my $depends_on_id (@$depends_on) {
        $sth_deps->execute($bug->bug_id, $depends_on_id);
        # Log the reverse action on the other bug.
        LogActivityEntry($depends_on_id, 'blocked', '', $bug->bug_id,
                         $bug->{reporter_id}, $timestamp);
        $sth_bug_time->execute($timestamp, $depends_on_id);
    }
    foreach my $blocked_id (@$blocked) {
        $sth_deps->execute($blocked_id, $bug->bug_id);
        # Log the reverse action on the other bug.
        LogActivityEntry($blocked_id, 'dependson', '', $bug->bug_id,
                         $bug->{reporter_id}, $timestamp);
        $sth_bug_time->execute($timestamp, $blocked_id);
    }

    # Insert the values into the multiselect value tables
    foreach my $field (keys %$ms_values) {
        $dbh->do("DELETE FROM bug_$field where bug_id = ?",
                undef, $bug->bug_id);
        foreach my $value ( @{$ms_values->{$field}} ) {
            $dbh->do("INSERT INTO bug_$field (bug_id, value) VALUES (?,?)",
                    undef, $bug->bug_id, $value);
        }
    }

    # Comment #0 handling...

    # We now have a bug id so we can fill this out
    $creation_comment->{'bug_id'} = $bug->id;

    # Insert the comment. We always insert a comment on bug creation,
    # but sometimes it's blank.
    Bugzilla::Comment->insert_create_data($creation_comment);

    Bugzilla::Hook::process('bug_end_of_create', { bug => $bug,
                                                   timestamp => $timestamp,
                                                 });

    $dbh->bz_commit_transaction();

    # Because MySQL doesn't support transactions on the fulltext table,
    # we do this after we've committed the transaction. That way we're
    # sure we're inserting a good Bug ID.
    $bug->_sync_fulltext( new_bug => 1 );

    return $bug;
}

sub run_create_validators {
    my $class  = shift;
    my $params = $class->SUPER::run_create_validators(@_);

    # Add classification for checking mandatory fields which depend on it
    $params->{classification} = $params->{product}->classification->name;

    my @mandatory_fields = @{ Bugzilla->fields({ is_mandatory => 1,
                                                 enter_bug    => 1,
                                                 obsolete     => 0 }) };
    foreach my $field (@mandatory_fields) {
        $class->_check_field_is_mandatory($params->{$field->name}, $field,
                                          $params);
    }

    my $product = delete $params->{product};
    $params->{product_id} = $product->id;
    my $component = delete $params->{component};
    $params->{component_id} = $component->id;

    # Callers cannot set reporter, creation_ts, or delta_ts.
    $params->{reporter} = $class->_check_reporter();
    $params->{delta_ts} = $params->{creation_ts};

    if ($params->{estimated_time}) {
        $params->{remaining_time} = $params->{estimated_time};
    }

    $class->_check_strict_isolation($params->{cc}, $params->{assigned_to},
                                    $params->{qa_contact}, $product);

    # You can't set these fields.
    delete $params->{lastdiffed};
    delete $params->{bug_id};
    delete $params->{classification};

    Bugzilla::Hook::process('bug_end_of_create_validators',
                            { params => $params });

    # And this is not a valid DB field, it's just used as part of 
    # _check_dependencies to avoid running it twice for both blocked 
    # and dependson.
    delete $params->{_dependencies_validated};

    return $params;
}

sub update {
    my $self = shift;
    my $dbh  = Bugzilla->dbh;
    my $user = Bugzilla->user;

    # XXX This is just a temporary hack until all updating happens
    # inside this function.
    my $delta_ts = shift || $dbh->selectrow_array('SELECT LOCALTIMESTAMP(0)');

    $dbh->bz_start_transaction();

    my ($changes, $old_bug) = $self->SUPER::update(@_);

    Bugzilla::Hook::process('bug_start_of_update',
        { timestamp => $delta_ts, bug => $self,
           old_bug => $old_bug, changes => $changes });

    # Certain items in $changes have to be fixed so that they hold
    # a name instead of an ID.
    foreach my $field (qw(product_id component_id)) {
        my $change = delete $changes->{$field};
        if ($change) {
            my $new_field = $field;
            $new_field =~ s/_id$//;
            $changes->{$new_field} = 
                [$self->{"_old_${new_field}_name"}, $self->$new_field];
        }
    }
    foreach my $field (qw(qa_contact assigned_to)) {
        if ($changes->{$field}) {
            my ($from, $to) = @{ $changes->{$field} };
            $from = $old_bug->$field->login if $from;
            $to   = $self->$field->login    if $to;
            $changes->{$field} = [$from, $to];
        }
    }

    # CC
    my @old_cc = map {$_->id} @{$old_bug->cc_users};
    my @new_cc = map {$_->id} @{$self->cc_users};
    my ($removed_cc, $added_cc) = diff_arrays(\@old_cc, \@new_cc);
    
    if (scalar @$removed_cc) {
        $dbh->do('DELETE FROM cc WHERE bug_id = ? AND ' 
                 . $dbh->sql_in('who', $removed_cc), undef, $self->id);
    }
    foreach my $user_id (@$added_cc) {
        $dbh->do('INSERT INTO cc (bug_id, who) VALUES (?,?)',
                 undef, $self->id, $user_id);
    }
    # If any changes were found, record it in the activity log
    if (scalar @$removed_cc || scalar @$added_cc) {
        my $removed_users = Bugzilla::User->new_from_list($removed_cc);
        my $added_users   = Bugzilla::User->new_from_list($added_cc);
        my $removed_names = join(', ', (map {$_->login} @$removed_users));
        my $added_names   = join(', ', (map {$_->login} @$added_users));
        $changes->{cc} = [$removed_names, $added_names];
    }
    
    # Keywords
    my @old_kw_ids = map { $_->id } @{$old_bug->keyword_objects};
    my @new_kw_ids = map { $_->id } @{$self->keyword_objects};

    my ($removed_kw, $added_kw) = diff_arrays(\@old_kw_ids, \@new_kw_ids);

    if (scalar @$removed_kw) {
        $dbh->do('DELETE FROM keywords WHERE bug_id = ? AND ' 
                 . $dbh->sql_in('keywordid', $removed_kw), undef, $self->id);
    }
    foreach my $keyword_id (@$added_kw) {
        $dbh->do('INSERT INTO keywords (bug_id, keywordid) VALUES (?,?)',
                 undef, $self->id, $keyword_id);
    }
    # If any changes were found, record it in the activity log
    if (scalar @$removed_kw || scalar @$added_kw) {
        my $removed_keywords = Bugzilla::Keyword->new_from_list($removed_kw);
        my $added_keywords   = Bugzilla::Keyword->new_from_list($added_kw);
        my $removed_names = join(', ', (map {$_->name} @$removed_keywords));
        my $added_names   = join(', ', (map {$_->name} @$added_keywords));
        $changes->{keywords} = [$removed_names, $added_names];
    }

    # Dependencies
    foreach my $pair ([qw(dependson blocked)], [qw(blocked dependson)]) {
        my ($type, $other) = @$pair;
        my $old = $old_bug->$type;
        my $new = $self->$type;
        
        my ($removed, $added) = diff_arrays($old, $new);
        foreach my $removed_id (@$removed) {
            $dbh->do("DELETE FROM dependencies WHERE $type = ? AND $other = ?",
                     undef, $removed_id, $self->id);
            
            # Add an activity entry for the other bug.
            LogActivityEntry($removed_id, $other, $self->id, '',
                             $user->id, $delta_ts);
            # Update delta_ts on the other bug so that we trigger mid-airs.
            $dbh->do('UPDATE bugs SET delta_ts = ? WHERE bug_id = ?',
                     undef, $delta_ts, $removed_id);
        }
        foreach my $added_id (@$added) {
            $dbh->do("INSERT INTO dependencies ($type, $other) VALUES (?,?)",
                     undef, $added_id, $self->id);
            
            # Add an activity entry for the other bug.
            LogActivityEntry($added_id, $other, '', $self->id,
                             $user->id, $delta_ts);
            # Update delta_ts on the other bug so that we trigger mid-airs.
            $dbh->do('UPDATE bugs SET delta_ts = ? WHERE bug_id = ?',
                     undef, $delta_ts, $added_id);
        }
        
        if (scalar(@$removed) || scalar(@$added)) {
            $changes->{$type} = [join(', ', @$removed), join(', ', @$added)];
        }
    }

    # Groups
    my %old_groups = map {$_->id => $_} @{$old_bug->groups_in};
    my %new_groups = map {$_->id => $_} @{$self->groups_in};
    my ($removed_gr, $added_gr) = diff_arrays([keys %old_groups],
                                              [keys %new_groups]);
    if (scalar @$removed_gr || scalar @$added_gr) {
        if (@$removed_gr) {
            my $qmarks = join(',', ('?') x @$removed_gr);
            $dbh->do("DELETE FROM bug_group_map
                       WHERE bug_id = ? AND group_id IN ($qmarks)", undef,
                     $self->id, @$removed_gr);
        }
        my $sth_insert = $dbh->prepare(
            'INSERT INTO bug_group_map (bug_id, group_id) VALUES (?,?)');
        foreach my $gid (@$added_gr) {
            $sth_insert->execute($self->id, $gid);
        }
        my @removed_names = map { $old_groups{$_}->name } @$removed_gr;
        my @added_names   = map { $new_groups{$_}->name } @$added_gr;
        $changes->{'bug_group'} = [join(', ', @removed_names),
                                   join(', ', @added_names)];
    }

    # Flags
    my ($removed, $added) = Bugzilla::Flag->update_flags($self, $old_bug, $delta_ts);
    if ($removed || $added) {
        $changes->{'flagtypes.name'} = [$removed, $added];
    }

    # Comments
    foreach my $comment (@{$self->{added_comments} || []}) {
        # Override the Comment's timestamp to be identical to the update
        # timestamp.
        $comment->{bug_when} = $delta_ts;
        $comment = Bugzilla::Comment->insert_create_data($comment);
        if ($comment->work_time) {
            LogActivityEntry($self->id, "work_time", "", $comment->work_time,
                             $user->id, $delta_ts);
        }
    }

    # Comment Privacy 
    foreach my $comment (@{$self->{comment_isprivate} || []}) {
        $comment->update();
        
        my ($from, $to) 
            = $comment->is_private ? (0, 1) : (1, 0);
        LogActivityEntry($self->id, "longdescs.isprivate", $from, $to, 
                         $user->id, $delta_ts, $comment->id);
    }

    # Insert the values into the multiselect value tables
    my @multi_selects = grep {$_->type == FIELD_TYPE_MULTI_SELECT}
                             Bugzilla->active_custom_fields;
    foreach my $field (@multi_selects) {
        my $name = $field->name;
        my ($removed, $added) = diff_arrays($old_bug->$name, $self->$name);
        if (scalar @$removed || scalar @$added) {
            $changes->{$name} = [join(', ', @$removed), join(', ', @$added)];

            $dbh->do("DELETE FROM bug_$name where bug_id = ?",
                     undef, $self->id);
            foreach my $value (@{$self->$name}) {
                $dbh->do("INSERT INTO bug_$name (bug_id, value) VALUES (?,?)",
                         undef, $self->id, $value);
            }
        }
    }

    # See Also

    my ($removed_see, $added_see) =
        diff_arrays($old_bug->see_also, $self->see_also, 'name');

    $_->remove_from_db foreach @$removed_see;
    $_->insert_create_data($_) foreach @$added_see;

    # If any changes were found, record it in the activity log
    if (scalar @$removed_see || scalar @$added_see) {
        $changes->{see_also} = [join(', ', map { $_->name } @$removed_see),
                                join(', ', map { $_->name } @$added_see)];
    }

    $_->update foreach @{ $self->{_update_ref_bugs} || [] };
    delete $self->{_update_ref_bugs};

    # Log bugs_activity items
    # XXX Eventually, when bugs_activity is able to track the dupe_id,
    # this code should go below the duplicates-table-updating code below.
    foreach my $field (keys %$changes) {
        my $change = $changes->{$field};
        my $from = defined $change->[0] ? $change->[0] : '';
        my $to   = defined $change->[1] ? $change->[1] : '';
        LogActivityEntry($self->id, $field, $from, $to,
                         $user->id, $delta_ts);
    }

    # Check if we have to update the duplicates table and the other bug.
    my ($old_dup, $cur_dup) = ($old_bug->dup_id || 0, $self->dup_id || 0);
    if ($old_dup != $cur_dup) {
        $dbh->do("DELETE FROM duplicates WHERE dupe = ?", undef, $self->id);
        if ($cur_dup) {
            $dbh->do('INSERT INTO duplicates (dupe, dupe_of) VALUES (?,?)',
                     undef, $self->id, $cur_dup);
            if (my $update_dup = delete $self->{_dup_for_update}) {
                $update_dup->update();
            }
        }

        $changes->{'dup_id'} = [$old_dup || undef, $cur_dup || undef];
    }

    Bugzilla::Hook::process('bug_end_of_update', 
        { bug => $self, timestamp => $delta_ts, changes => $changes,
          old_bug => $old_bug });

    # If any change occurred, refresh the timestamp of the bug.
    if (scalar(keys %$changes) || $self->{added_comments}
        || $self->{comment_isprivate})
    {
        $dbh->do('UPDATE bugs SET delta_ts = ? WHERE bug_id = ?',
                 undef, ($delta_ts, $self->id));
        $self->{delta_ts} = $delta_ts;
    }

    # Update bug ignore data if user wants to ignore mail for this bug
    if (exists $self->{'bug_ignored'}) {
        my $bug_ignored_changed;
        if ($self->{'bug_ignored'} && !$user->is_bug_ignored($self->id)) {
            $dbh->do('INSERT INTO email_bug_ignore
                      (user_id, bug_id) VALUES (?, ?)',
                     undef, $user->id, $self->id);
            $bug_ignored_changed = 1;

        }
        elsif (!$self->{'bug_ignored'} && $user->is_bug_ignored($self->id)) {
            $dbh->do('DELETE FROM email_bug_ignore
                      WHERE user_id = ? AND bug_id = ?',
                     undef, $user->id, $self->id);
            $bug_ignored_changed = 1;
        }
        delete $user->{bugs_ignored} if $bug_ignored_changed;
    }

    $dbh->bz_commit_transaction();

    # The only problem with this here is that update() is often called
    # in the middle of a transaction, and if that transaction is rolled
    # back, this change will *not* be rolled back. As we expect rollbacks
    # to be extremely rare, that is OK for us.
    $self->_sync_fulltext(
        update_short_desc => $changes->{short_desc},
        update_comments   => $self->{added_comments} || $self->{comment_isprivate}
    );

    # Remove obsolete internal variables.
    delete $self->{'_old_assigned_to'};
    delete $self->{'_old_qa_contact'};

    # Also flush the visible_bugs cache for this bug as the user's
    # relationship with this bug may have changed.
    delete $user->{_visible_bugs_cache}->{$self->id};

    return $changes;
}

# Used by create().
# We need to handle multi-select fields differently than normal fields,
# because they're arrays and don't go into the bugs table.
sub _extract_multi_selects {
    my ($invocant, $params) = @_;

    my @multi_selects = grep {$_->type == FIELD_TYPE_MULTI_SELECT}
                             Bugzilla->active_custom_fields;
    my %ms_values;
    foreach my $field (@multi_selects) {
        my $name = $field->name;
        if (exists $params->{$name}) {
            my $array = delete($params->{$name}) || [];
            $ms_values{$name} = $array;
        }
    }
    return \%ms_values;
}

# Should be called any time you update short_desc or change a comment.
sub _sync_fulltext {
    my ($self, %options) = @_;
    my $dbh = Bugzilla->dbh;

    my($all_comments, $public_comments);
    if ($options{new_bug} || $options{update_comments}) {
        my $comments = $dbh->selectall_arrayref(
            'SELECT thetext, isprivate FROM longdescs WHERE bug_id = ?',
            undef, $self->id);
        $all_comments = join("\n", map { $_->[0] } @$comments);
        my @no_private = grep { !$_->[1] } @$comments;
        $public_comments = join("\n", map { $_->[0] } @no_private);
    }

    if ($options{new_bug}) {
        $dbh->do('INSERT INTO bugs_fulltext (bug_id, short_desc, comments,
                                             comments_noprivate)
                 VALUES (?, ?, ?, ?)',
                 undef,
                 $self->id, $self->short_desc, $all_comments, $public_comments);
    } else {
        my(@names, @values);
        if ($options{update_short_desc}) {
            push @names, 'short_desc';
            push @values, $self->short_desc;
        }
        if ($options{update_comments}) {
            push @names, ('comments', 'comments_noprivate');
            push @values, ($all_comments, $public_comments);
        }
        if (@names) {
            $dbh->do('UPDATE bugs_fulltext SET ' .
                     join(', ', map { "$_ = ?" } @names) .
                     ' WHERE bug_id = ?',
                     undef,
                     @values, $self->id);
        }
    }
}

sub remove_from_db {
    my ($self) = @_;
    my $dbh = Bugzilla->dbh;

    ThrowCodeError("bug_error", { bug => $self }) if $self->{'error'};

    my $bug_id = $self->{'bug_id'};
    $self->SUPER::remove_from_db();
    # The bugs_fulltext table doesn't support foreign keys.
    $dbh->do("DELETE FROM bugs_fulltext WHERE bug_id = ?", undef, $bug_id);
}

#####################################################################
# Sending Email After Bug Update
#####################################################################

sub send_changes {
    my ($self, $changes, $vars) = @_;

    my $user = Bugzilla->user;

    my $old_qa  = $changes->{'qa_contact'}  
                  ? $changes->{'qa_contact'}->[0] : '';
    my $old_own = $changes->{'assigned_to'} 
                  ? $changes->{'assigned_to'}->[0] : '';
    my $old_cc  = $changes->{cc}
                  ? $changes->{cc}->[0] : '';

    my %forced = (
        cc        => [split(/[,;]+/, $old_cc)],
        owner     => $old_own,
        qacontact => $old_qa,
        changer   => $user,
    );

    _send_bugmail({ id => $self->id, type => 'bug', forced => \%forced }, 
                  $vars);

    # If the bug was marked as a duplicate, we need to notify users on the
    # other bug of any changes to that bug.
    my $new_dup_id = $changes->{'dup_id'} ? $changes->{'dup_id'}->[1] : undef;
    if ($new_dup_id) {
        _send_bugmail({ forced => { changer => $user }, type => "dupe",
                        id => $new_dup_id }, $vars);
    }

    # If there were changes in dependencies, we need to notify those
    # dependencies.
    if ($changes->{'bug_status'}) {
        my ($old_status, $new_status) = @{ $changes->{'bug_status'} };

        # If this bug has changed from opened to closed or vice-versa,
        # then all of the bugs we block need to be notified.
        if (is_open_state($old_status) ne is_open_state($new_status)) {
            my $params = { forced   => { changer => $user },
                           type     => 'dep',
                           dep_only => 1,
                           blocker  => $self,
                           changes  => $changes };

            foreach my $id (@{ $self->blocked }) {
                $params->{id} = $id;
                _send_bugmail($params, $vars);
            }
        }
    }

    # To get a list of all changed dependencies, convert the "changes" arrays
    # into a long string, then collapse that string into unique numbers in
    # a hash.
    my $all_changed_deps = join(', ', @{ $changes->{'dependson'} || [] });
    $all_changed_deps = join(', ', @{ $changes->{'blocked'} || [] },
                                   $all_changed_deps);
    my %changed_deps = map { $_ => 1 } split(', ', $all_changed_deps);
    # When clearning one field (say, blocks) and filling in the other
    # (say, dependson), an empty string can get into the hash and cause
    # an error later.
    delete $changed_deps{''};

    foreach my $id (sort { $a <=> $b } (keys %changed_deps)) {
        _send_bugmail({ forced => { changer => $user }, type => "dep",
                         id => $id }, $vars);
    }

    # Sending emails for the referenced bugs.
    foreach my $ref_bug_id (uniq @{ $self->{see_also_changes} || [] }) {
        _send_bugmail({ forced => { changer => $user },
                        id => $ref_bug_id }, $vars);
    }
}

sub _send_bugmail {
    my ($params, $vars) = @_;

    require Bugzilla::BugMail;

    my $results = 
        Bugzilla::BugMail::Send($params->{'id'}, $params->{'forced'}, $params);

    if (Bugzilla->usage_mode == USAGE_MODE_BROWSER) {
        my $template = Bugzilla->template;
        $vars->{$_} = $params->{$_} foreach keys %$params;
        $vars->{'sent_bugmail'} = $results;
        $template->process("bug/process/results.html.tmpl", $vars)
            || ThrowTemplateError($template->error());
        $vars->{'header_done'} = 1;
    }
}

#####################################################################
# Validators
#####################################################################

sub _check_alias {
   my ($invocant, $alias) = @_;
   $alias = trim($alias);
   return undef if (!$alias);

    # Make sure the alias isn't too long.
    if (length($alias) > 20) {
        ThrowUserError("alias_too_long");
    }
    # Make sure the alias isn't just a number.
    if ($alias =~ /^\d+$/) {
        ThrowUserError("alias_is_numeric", { alias => $alias });
    }
    # Make sure the alias has no commas or spaces.
    if ($alias =~ /[, ]/) {
        ThrowUserError("alias_has_comma_or_space", { alias => $alias });
    }
    # Make sure the alias is unique, or that it's already our alias.
    my $other_bug = new Bugzilla::Bug($alias);
    if (!$other_bug->{error}
        && (!ref $invocant || $other_bug->id != $invocant->id))
    {
        ThrowUserError("alias_in_use", { alias => $alias,
                                         bug_id => $other_bug->id });
    }

   return $alias;
}

sub _check_assigned_to {
    my ($invocant, $assignee, undef, $params) = @_;
    my $user = Bugzilla->user;
    my $component = blessed($invocant) ? $invocant->component_obj
                                       : $params->{component};

    # Default assignee is the component owner.
    my $id;
    # If this is a new bug, you can only set the assignee if you have editbugs.
    # If you didn't specify the assignee, we use the default assignee.
    if (!ref $invocant
        && (!$user->in_group('editbugs', $component->product_id) || !$assignee))
    {
        $id = $component->default_assignee->id;
    } else {
        if (!ref $assignee) {
            $assignee = trim($assignee);
            # When updating a bug, assigned_to can't be empty.
            ThrowUserError("reassign_to_empty") if ref $invocant && !$assignee;
            $assignee = Bugzilla::User->check($assignee);
        }
        $id = $assignee->id;
        # create() checks this another way, so we don't have to run this
        # check during create().
        $invocant->_check_strict_isolation_for_user($assignee) if ref $invocant;
    }
    return $id;
}

sub _check_bug_file_loc {
    my ($invocant, $url) = @_;
    $url = '' if !defined($url);
    $url = trim($url);
    # On bug entry, if bug_file_loc is "http://", the default, use an 
    # empty value instead. However, on bug editing people can set that
    # back if they *really* want to.
    if (!ref $invocant && $url eq 'http://') {
        $url = '';
    }
    return $url;
}

sub _check_bug_status {
    my ($invocant, $new_status, undef, $params) = @_;
    my $user = Bugzilla->user;
    my @valid_statuses;
    my $old_status; # Note that this is undef for new bugs.

    my ($product, $comment);
    if (ref $invocant) {
        @valid_statuses = @{$invocant->statuses_available};
        $product = $invocant->product_obj;
        $old_status = $invocant->status;
        my $comments = $invocant->{added_comments} || [];
        $comment = $comments->[-1];
    }
    else {
        $product = $params->{product};
        $comment = $params->{comment};
        @valid_statuses = @{ Bugzilla::Bug->statuses_available($product) };
    }

    # Check permissions for users filing new bugs.
    if (!ref $invocant) {
        if ($user->in_group('editbugs', $product->id)
            || $user->in_group('canconfirm', $product->id)) {
            # If the user with privs hasn't selected another status,
            # select the first one of the list.
            unless ($new_status) {
                if (scalar(@valid_statuses) == 1) {
                    $new_status = $valid_statuses[0];
                }
                else {
                    $new_status = ($valid_statuses[0]->name ne 'UNCONFIRMED') ?
                                  $valid_statuses[0] : $valid_statuses[1];
                }
            }
        }
        else {
            # A user with no privs cannot choose the initial status.
            # If UNCONFIRMED is valid for this product, use it; else
            # use the first bug status available.
            if (grep {$_->name eq 'UNCONFIRMED'} @valid_statuses) {
                $new_status = 'UNCONFIRMED';
            }
            else {
                $new_status = $valid_statuses[0];
            }
        }
    }

    # Time to validate the bug status.
    $new_status = Bugzilla::Status->check($new_status) unless ref($new_status);
    # We skip this check if we are changing from a status to itself.
    if ( (!$old_status || $old_status->id != $new_status->id)
          && !grep {$_->name eq $new_status->name} @valid_statuses) 
    {
        ThrowUserError('illegal_bug_status_transition',
                       { old => $old_status, new => $new_status });
    }

    # Check if a comment is required for this change.
    if ($new_status->comment_required_on_change_from($old_status)
        && !$comment->{'thetext'})
    {
        ThrowUserError('comment_required',
          { old => $old_status ? $old_status->name : undef,
            new => $new_status->name, field => 'bug_status' });
    }
    
    if (ref $invocant 
        && ($new_status->name eq 'IN_PROGRESS'
            # Backwards-compat for the old default workflow.
            or $new_status->name eq 'ASSIGNED')
        && Bugzilla->params->{"usetargetmilestone"}
        && Bugzilla->params->{"musthavemilestoneonaccept"}
        # musthavemilestoneonaccept applies only if at least two
        # target milestones are defined for the product.
        && scalar(@{ $product->milestones }) > 1
        && $invocant->target_milestone eq $product->default_milestone)
    {
        ThrowUserError("milestone_required", { bug => $invocant });
    }

    if (!blessed $invocant) {
        $params->{everconfirmed} = $new_status->name eq 'UNCONFIRMED' ? 0 : 1;
    }

    return $new_status->name;
}

sub _check_cc {
    my ($invocant, $ccs, undef, $params) = @_;
    my $component = blessed($invocant) ? $invocant->component_obj
                                       : $params->{component};
    return [map {$_->id} @{$component->initial_cc}] unless $ccs;

    # Allow comma-separated input as well as arrayrefs.
    $ccs = [split(/[,;]+/, $ccs)] if !ref $ccs;

    my %cc_ids;
    foreach my $person (@$ccs) {
        $person = trim($person);
        next unless $person;
        my $id = login_to_id($person, THROW_ERROR);
        $cc_ids{$id} = 1;
    }

    # Enforce Default CC
    $cc_ids{$_->id} = 1 foreach (@{$component->initial_cc});

    return [keys %cc_ids];
}

sub _check_comment {
    my ($invocant, $comment_txt, undef, $params) = @_;

    # Comment can be empty. We should force it to be empty if the text is undef
    if (!defined $comment_txt) {
        $comment_txt = '';
    }

    # Load up some data
    my $isprivate = delete $params->{comment_is_private};
    my $timestamp = $params->{creation_ts};

    # Create the new comment so we can check it
    my $comment = {
        thetext  => $comment_txt,
        bug_when => $timestamp,
    };

    # We don't include the "isprivate" column unless it was specified. 
    # This allows it to fall back to its database default.
    if (defined $isprivate) {
        $comment->{isprivate} = $isprivate;
    }

    # Validate comment. We have to do this special as a comment normally
    # requires a bug to be already created. For a new bug, the first comment
    # obviously can't get the bug if the bug is created after this
    # (see bug 590334)
    Bugzilla::Comment->check_required_create_fields($comment);
    $comment = Bugzilla::Comment->run_create_validators($comment,
                                                        { skip => ['bug_id'] }
    );

    return $comment; 
}

sub _check_commenton {
    my ($invocant, $new_value, $field, $params) = @_;

    my $has_comment =
        ref($invocant) ? $invocant->{added_comments}
                       : (defined $params->{comment}
                          and $params->{comment}->{thetext} ne '');

    my $is_changing = ref($invocant) ? $invocant->$field ne $new_value
                                     : $new_value ne '';

    if ($is_changing && !$has_comment) {
        my $old_value = ref($invocant) ? $invocant->$field : undef;
        ThrowUserError('comment_required',
            { field => $field, old => $old_value, new => $new_value });
    }
}

sub _check_component {
    my ($invocant, $name, undef, $params) = @_;
    $name = trim($name);
    $name || ThrowUserError("require_component");
    my $product = blessed($invocant) ? $invocant->product_obj 
                                     : $params->{product};
    my $old_comp = blessed($invocant) ? $invocant->component : '';
    my $object = Bugzilla::Component->check({ product => $product, name => $name });
    if ($object->name ne $old_comp && !$object->is_active) {
        ThrowUserError('value_inactive', { class => ref($object), value => $name });
    }
    return $object;
}

sub _check_creation_ts {
    return Bugzilla->dbh->selectrow_array('SELECT LOCALTIMESTAMP(0)');
}

sub _check_deadline {
    my ($invocant, $date) = @_;

    # When filing bugs, we're forgiving and just return undef if
    # the user isn't a timetracker. When updating bugs, check_can_change_field
    # controls permissions, so we don't want to check them here.
    if (!ref $invocant and !Bugzilla->user->is_timetracker) {
        return undef;
    }

    # Validate entered deadline
    $date = trim($date);
    return undef if !$date;
    validate_date($date)
        || ThrowUserError('illegal_date', { date   => $date,
                                            format => 'YYYY-MM-DD' });
    return $date;
}

# Takes two comma/space-separated strings and returns arrayrefs
# of valid bug IDs.
sub _check_dependencies {
    my ($invocant, $value, $field, $params) = @_;

    return $value if $params->{_dependencies_validated};

    if (!ref $invocant) {
        # Only editbugs users can set dependencies on bug entry.
        return ([], []) unless Bugzilla->user->in_group(
            'editbugs', $params->{product}->id);
    }

    # This is done this way so that dependson and blocked can be in
    # VALIDATORS, meaning that they can be in VALIDATOR_DEPENDENCIES,
    # which means that they can be checked in the right order during
    # bug creation.
    my $opposite = $field eq 'dependson' ? 'blocked' : 'dependson';
    my %deps_in = ($field => $value || '',
                   $opposite => $params->{$opposite} || '');

    foreach my $type (qw(dependson blocked)) {
        my @bug_ids = ref($deps_in{$type}) 
            ? @{$deps_in{$type}} 
            : split(/[\s,]+/, $deps_in{$type});
        # Eliminate nulls.
        @bug_ids = grep {$_} @bug_ids;

        my @check_access = @bug_ids;
        # When we're updating a bug, only added or removed bug_ids are 
        # checked for whether or not we can see/edit those bugs.
        if (ref $invocant) {
            my $old = $invocant->$type;
            my ($removed, $added) = diff_arrays($old, \@bug_ids);
            @check_access = (@$added, @$removed);
            
            # Check field permissions if we've changed anything.
            if (@check_access) {
                my $privs;
                if (!$invocant->check_can_change_field($type, 0, 1, \$privs)) {
                    ThrowUserError('illegal_change', { field => $type,
                                                       privs => $privs });
                }
            }
        }

        my $user = Bugzilla->user;
        foreach my $modified_id (@check_access) {
            my $delta_bug = $invocant->check($modified_id);
            # Under strict isolation, you can't modify a bug if you can't
            # edit it, even if you can see it.
            if (Bugzilla->params->{"strict_isolation"}) {
                if (!$user->can_edit_product($delta_bug->{'product_id'})) {
                    ThrowUserError("illegal_change_deps", {field => $type});
                }
            }
        }
        # Replace all aliases by their corresponding bug ID.
        @bug_ids = map { $_ =~ /^(\d+)$/ ? $1 : $invocant->check($_, $type)->id } @bug_ids;
        $deps_in{$type} = \@bug_ids;
    }

    # And finally, check for dependency loops.
    my $bug_id = ref($invocant) ? $invocant->id : 0;
    my %deps = ValidateDependencies($deps_in{dependson}, $deps_in{blocked},
                                    $bug_id);

    $params->{$opposite} = $deps{$opposite};
    $params->{_dependencies_validated} = 1;
    return $deps{$field};
}

sub _check_dup_id {
    my ($self, $dupe_of) = @_;
    my $dbh = Bugzilla->dbh;

    # Store the bug ID/alias passed by the user for visibility checks.
    my $orig_dupe_of = $dupe_of = trim($dupe_of);
    $dupe_of || ThrowCodeError('undefined_field', { field => 'dup_id' });
    # Validate the bug ID. The second argument will force check() to only
    # make sure that the bug exists, and convert the alias to the bug ID
    # if a string is passed. Group restrictions are checked below.
    my $dupe_of_bug = $self->check($dupe_of, 'dup_id');
    $dupe_of = $dupe_of_bug->id;

    # If the dupe is unchanged, we have nothing more to check.
    return $dupe_of if ($self->dup_id && $self->dup_id == $dupe_of);

    # If we come here, then the duplicate is new. We have to make sure
    # that we can view/change it (issue A on bug 96085).
    $dupe_of_bug->check_is_visible($orig_dupe_of);

    # Make sure a loop isn't created when marking this bug
    # as duplicate.
   _resolve_ultimate_dup_id($self->id, $dupe_of, 1);

    my $cur_dup = $self->dup_id || 0;
    if ($cur_dup != $dupe_of && Bugzilla->params->{'commentonduplicate'}
        && !$self->{added_comments})
    {
        ThrowUserError('comment_required');
    }

    # Should we add the reporter to the CC list of the new bug?
    # If he can see the bug...
    if ($self->reporter->can_see_bug($dupe_of)) {
        # We only add him if he's not the reporter of the other bug.
        $self->{_add_dup_cc} = 1
            if $dupe_of_bug->reporter->id != $self->reporter->id;
    }
    # What if the reporter currently can't see the new bug? In the browser 
    # interface, we prompt the user. In other interfaces, we default to 
    # not adding the user, as the safest option.
    elsif (Bugzilla->usage_mode == USAGE_MODE_BROWSER) {
        # If we've already confirmed whether the user should be added...
        my $cgi = Bugzilla->cgi;
        my $add_confirmed = $cgi->param('confirm_add_duplicate');
        if (defined $add_confirmed) {
            $self->{_add_dup_cc} = $add_confirmed;
        }
        else {
            # Note that here we don't check if he user is already the reporter
            # of the dupe_of bug, since we already checked if he can *see*
            # the bug, above. People might have reporter_accessible turned
            # off, but cclist_accessible turned on, so they might want to
            # add the reporter even though he's already the reporter of the
            # dup_of bug.
            my $vars = {};
            my $template = Bugzilla->template;
            # Ask the user what they want to do about the reporter.
            $vars->{'cclist_accessible'} = $dupe_of_bug->cclist_accessible;
            $vars->{'original_bug_id'} = $dupe_of;
            $vars->{'duplicate_bug_id'} = $self->id;
            print $cgi->header();
            $template->process("bug/process/confirm-duplicate.html.tmpl", $vars)
              || ThrowTemplateError($template->error());
            exit;
        }
    }

    return $dupe_of;
}

sub _check_groups {
    my ($invocant, $group_names, undef, $params) = @_;

    my $bug_id = blessed($invocant) ? $invocant->id : undef;
    my $product = blessed($invocant) ? $invocant->product_obj 
                                     : $params->{product};
    my %add_groups;

    # In email or WebServices, when the "groups" item actually 
    # isn't specified, then just add the default groups.
    if (!defined $group_names) {
        my $available = $product->groups_available;
        foreach my $group (@$available) {
            $add_groups{$group->id} = $group if $group->{is_default};
        }
    }
    else {
        # Allow a comma-separated list, for email_in.pl.
        $group_names = [map { trim($_) } split(',', $group_names)]
            if !ref $group_names;

        # First check all the groups they chose to set.
        my %args = ( product => $product->name, bug_id => $bug_id, action => 'add' );
        foreach my $name (@$group_names) {
            my $group = Bugzilla::Group->check_no_disclose({ %args, name => $name });

            if (!$product->group_is_settable($group)) {
                ThrowUserError('group_restriction_not_allowed', { %args, name => $name });
            }
            $add_groups{$group->id} = $group;
        }
    }

    # Now enforce mandatory groups.
    $add_groups{$_->id} = $_ foreach @{ $product->groups_mandatory };

    my @add_groups = values %add_groups;
    return \@add_groups;
}

sub _check_keywords {
    my ($invocant, $keywords_in, undef, $params) = @_;

    return [] if !defined $keywords_in;

    my $keyword_array = $keywords_in;
    if (!ref $keyword_array) {
        $keywords_in = trim($keywords_in);
        $keyword_array = [split(/[\s,]+/, $keywords_in)];
    }
 
    my %keywords;
    foreach my $keyword (@$keyword_array) {
        next unless $keyword;
        my $obj = Bugzilla::Keyword->check($keyword);
        $keywords{$obj->id} = $obj;
    }
    return [values %keywords];
}

sub _check_product {
    my ($invocant, $name) = @_;
    $name = trim($name);
    # If we're updating the bug and they haven't changed the product,
    # always allow it.
    if (ref $invocant && lc($invocant->product_obj->name) eq lc($name)) {
        return $invocant->product_obj;
    }
    # Check that the product exists and that the user
    # is allowed to enter bugs into this product.
    my $product = Bugzilla->user->can_enter_product($name, THROW_ERROR);
    return $product;
}

sub _check_priority {
    my ($invocant, $priority) = @_;
    if (!ref $invocant && !Bugzilla->params->{'letsubmitterchoosepriority'}) {
        $priority = Bugzilla->params->{'defaultpriority'};
    }
    return $invocant->_check_select_field($priority, 'priority');
}

sub _check_qa_contact {
    my ($invocant, $qa_contact, undef, $params) = @_;
    $qa_contact = trim($qa_contact) if !ref $qa_contact;
    my $component = blessed($invocant) ? $invocant->component_obj
                                       : $params->{component};
    if (!ref $invocant) {
        # Bugs get no QA Contact on creation if useqacontact is off.
        return undef if !Bugzilla->params->{useqacontact};
        # Set the default QA Contact if one isn't specified or if the
        # user doesn't have editbugs.
        if (!Bugzilla->user->in_group('editbugs', $component->product_id)
            || !$qa_contact)
        {
            return $component->default_qa_contact ? $component->default_qa_contact->id : undef;
        }
    }

    # If a QA Contact was specified or if we're updating, check
    # the QA Contact for validity.
    my $id;
    if ($qa_contact) {
        $qa_contact = Bugzilla::User->check($qa_contact) if !ref $qa_contact;
        $id = $qa_contact->id;
        # create() checks this another way, so we don't have to run this
        # check during create().
        # If there is no QA contact, this check is not required.
        $invocant->_check_strict_isolation_for_user($qa_contact)
            if (ref $invocant && $id);
    }

    # "0" always means "undef", for QA Contact.
    return $id || undef;
}

sub _check_reporter {
    my $invocant = shift;
    my $reporter;
    if (ref $invocant) {
        # You cannot change the reporter of a bug.
        $reporter = $invocant->reporter->id;
    }
    else {
        # On bug creation, the reporter is the logged in user
        # (meaning that he must be logged in first!).
        Bugzilla->login(LOGIN_REQUIRED);
        $reporter = Bugzilla->user->id;
    }
    return $reporter;
}

sub _check_resolution {
    my ($invocant, $resolution, undef, $params) = @_;
    $resolution = trim($resolution);
    my $status = ref($invocant) ? $invocant->status->name 
                                : $params->{bug_status};
    my $is_open = ref($invocant) ? $invocant->status->is_open 
                                 : is_open_state($status);
    
    # Throw a special error for resolving bugs without a resolution
    # (or trying to change the resolution to '' on a closed bug without
    # using clear_resolution).
    ThrowUserError('missing_resolution', { status => $status })
        if !$resolution && !$is_open;
    
    # Make sure this is a valid resolution.
    $resolution = $invocant->_check_select_field($resolution, 'resolution');

    # Don't allow open bugs to have resolutions.
    ThrowUserError('resolution_not_allowed') if $is_open;
    
    # Check noresolveonopenblockers.
    my $dependson = ref($invocant) ? $invocant->dependson
                                   : ($params->{dependson} || []);
    if (Bugzilla->params->{"noresolveonopenblockers"}
        && $resolution eq 'FIXED'
        && (!ref $invocant or !$invocant->resolution 
            or $resolution ne $invocant->resolution)
        && scalar @$dependson)
    {
        my $dep_bugs = Bugzilla::Bug->new_from_list($dependson);
        my $count_open = grep { $_->isopened } @$dep_bugs;
        if ($count_open) {
            my $bug_id = ref($invocant) ? $invocant->id : undef;
            ThrowUserError("still_unresolved_bugs",
                           { bug_id => $bug_id, dep_count => $count_open });
        }
    }

    # Check if they're changing the resolution and need to comment.
    if (Bugzilla->params->{'commentonchange_resolution'}) {
        $invocant->_check_commenton($resolution, 'resolution', $params);
    }
    
    return $resolution;
}

sub _check_short_desc {
    my ($invocant, $short_desc) = @_;
    # Set the parameter to itself, but cleaned up
    $short_desc = clean_text($short_desc) if $short_desc;

    if (!defined $short_desc || $short_desc eq '') {
        ThrowUserError("require_summary");
    }
    if (length($short_desc) > MAX_FREETEXT_LENGTH) {
        ThrowUserError('freetext_too_long', 
                       { field => 'short_desc', text => $short_desc });
    }
    return $short_desc;
}

sub _check_status_whiteboard { return defined $_[1] ? $_[1] : ''; }

# Unlike other checkers, this one doesn't return anything.
sub _check_strict_isolation {
    my ($invocant, $ccs, $assignee, $qa_contact, $product) = @_;
    return unless Bugzilla->params->{'strict_isolation'};

    if (ref $invocant) {
        my $original = $invocant->new($invocant->id);

        # We only check people if they've been added. This way, if
        # strict_isolation is turned on when there are invalid users
        # on bugs, people can still add comments and so on.
        my @old_cc = map { $_->id } @{$original->cc_users};
        my @new_cc = map { $_->id } @{$invocant->cc_users};
        my ($removed, $added) = diff_arrays(\@old_cc, \@new_cc);
        $ccs = Bugzilla::User->new_from_list($added);

        $assignee = $invocant->assigned_to
            if $invocant->assigned_to->id != $original->assigned_to->id;
        if ($invocant->qa_contact
            && (!$original->qa_contact
                || $invocant->qa_contact->id != $original->qa_contact->id))
        {
            $qa_contact = $invocant->qa_contact;
        }
        $product = $invocant->product_obj;
    }

    my @related_users = @$ccs;
    push(@related_users, $assignee) if $assignee;

    if (Bugzilla->params->{'useqacontact'} && $qa_contact) {
        push(@related_users, $qa_contact);
    }

    @related_users = @{Bugzilla::User->new_from_list(\@related_users)}
        if !ref $invocant;

    # For each unique user in @related_users...(assignee and qa_contact
    # could be duplicates of users in the CC list)
    my %unique_users = map {$_->id => $_} @related_users;
    my @blocked_users;
    foreach my $id (keys %unique_users) {
        my $related_user = $unique_users{$id};
        if (!$related_user->can_edit_product($product->id) ||
            !$related_user->can_see_product($product->name)) {
            push (@blocked_users, $related_user->login);
        }
    }
    if (scalar(@blocked_users)) {
        my %vars = ( users   => \@blocked_users,
                     product => $product->name );
        if (ref $invocant) {
            $vars{'bug_id'} = $invocant->id;
        }
        else {
            $vars{'new'} = 1;
        }
        ThrowUserError("invalid_user_group", \%vars);
    }
}

# This is used by various set_ checkers, to make their code simpler.
sub _check_strict_isolation_for_user {
    my ($self, $user) = @_;
    return unless Bugzilla->params->{"strict_isolation"};
    if (!$user->can_edit_product($self->{product_id})) {
        ThrowUserError('invalid_user_group',
                       { users   => $user->login,
                         product => $self->product,
                         bug_id  => $self->id });
    }
}

sub _check_tag_name {
    my ($invocant, $tag) = @_;

    $tag = clean_text($tag);
    $tag || ThrowUserError('no_tag_to_edit');
    ThrowUserError('tag_name_too_long') if length($tag) > MAX_LEN_QUERY_NAME;
    trick_taint($tag);
    # Tags are all lowercase.
    return lc($tag);
}

sub _check_target_milestone {
    my ($invocant, $target, undef, $params) = @_;
    my $product = blessed($invocant) ? $invocant->product_obj 
                                     : $params->{product};
    my $old_target = blessed($invocant) ? $invocant->target_milestone : '';
    $target = trim($target);
    $target = $product->default_milestone if !defined $target;
    my $object = Bugzilla::Milestone->check(
        { product => $product, name => $target });
    if ($old_target && $object->name ne $old_target && !$object->is_active) {
        ThrowUserError('value_inactive', { class => ref($object),  value => $target });
    }
    return $object->name;
}

sub _check_time_field {
    my ($invocant, $value, $field, $params) = @_;

    # When filing bugs, we're forgiving and just return 0 if
    # the user isn't a timetracker. When updating bugs, check_can_change_field
    # controls permissions, so we don't want to check them here.
    if (!ref $invocant and !Bugzilla->user->is_timetracker) {
        return 0;
    }

    # check_time is in Bugzilla::Object.
    return $invocant->check_time($value, $field, $params);
}

sub _check_version {
    my ($invocant, $version, undef, $params) = @_;
    $version = trim($version);
    my $product = blessed($invocant) ? $invocant->product_obj 
                                     : $params->{product};
    my $old_vers = blessed($invocant) ? $invocant->version : '';
    my $object = Bugzilla::Version->check({ product => $product, name => $version });
    if ($object->name ne $old_vers && !$object->is_active) {
        ThrowUserError('value_inactive', { class => ref($object), value => $version });
    }
    return $object->name;
}

# Custom Field Validators

sub _check_field_is_mandatory {
    my ($invocant, $value, $field, $params) = @_;

    if (!blessed($field)) {
        $field = Bugzilla::Field->new({ name => $field });
        return if !$field;
    }

    return if !$field->is_mandatory;

    return if !$field->is_visible_on_bug($params || $invocant);

    return if ($field->type == FIELD_TYPE_SINGLE_SELECT
                 && scalar @{ get_legal_field_values($field->name) } == 1);

    return if ($field->type == FIELD_TYPE_MULTI_SELECT
                 && !scalar @{ get_legal_field_values($field->name) });

    if (ref($value) eq 'ARRAY') {
        $value = join('', @$value);
    }

    $value = trim($value);
    if (!defined($value)
        or $value eq ""
        or ($value eq '---' and $field->type == FIELD_TYPE_SINGLE_SELECT)
        or ($value =~ EMPTY_DATETIME_REGEX
            and $field->type == FIELD_TYPE_DATETIME))
    {
        ThrowUserError('required_field', { field => $field });
    }
}

sub _check_date_field {
    my ($invocant, $date) = @_;
    return $invocant->_check_datetime_field($date, undef, {date_only => 1});
}

sub _check_datetime_field {
    my ($invocant, $date_time, $field, $params) = @_;

    # Empty datetimes are empty strings or strings only containing
    # 0's, whitespace, and punctuation.
    if ($date_time =~ /^[\s0[:punct:]]*$/) {
        return undef;
    }

    $date_time = trim($date_time);
    my ($date, $time) = split(' ', $date_time);
    if ($date && !validate_date($date)) {
        ThrowUserError('illegal_date', { date   => $date,
                                         format => 'YYYY-MM-DD' });
    }
    if ($time && $params->{date_only}) {
        ThrowUserError('illegal_date', { date   => $date_time,
                                         format => 'YYYY-MM-DD' });
    }
    if ($time && !validate_time($time)) {
        ThrowUserError('illegal_time', { 'time' => $time,
                                         format => 'HH:MM:SS' });
    }
    return $date_time
}

sub _check_default_field { return defined $_[1] ? trim($_[1]) : ''; }

sub _check_freetext_field {
    my ($invocant, $text, $field) = @_;

    $text = (defined $text) ? trim($text) : '';
    if (length($text) > MAX_FREETEXT_LENGTH) {
        ThrowUserError('freetext_too_long', 
                       { field => $field, text => $text });
    }
    return $text;
}

sub _check_multi_select_field {
    my ($invocant, $values, $field) = @_;

    # Allow users (mostly email_in.pl) to specify multi-selects as
    # comma-separated values.
    if (defined $values and !ref $values) {
        # We don't split on spaces because multi-select values can and often
        # do have spaces in them. (Theoretically they can have commas in them
        # too, but that's much less common and people should be able to work
        # around it pretty cleanly, if they want to use email_in.pl.)
        $values = [split(',', $values)];
    }

    return [] if !$values;
    my @checked_values;
    foreach my $value (@$values) {
        push(@checked_values, $invocant->_check_select_field($value, $field));
    }
    return \@checked_values;
}

sub _check_select_field {
    my ($invocant, $value, $field) = @_;
    my $object = Bugzilla::Field::Choice->type($field)->check($value);
    return $object->name;
}

sub _check_bugid_field {
    my ($invocant, $value, $field) = @_;
    return undef if !$value;
    
    # check that the value is a valid, visible bug id
    my $checked_id = $invocant->check($value, $field)->id;
    
    # check for loop (can't have a loop if this is a new bug)
    if (ref $invocant) {
        _check_relationship_loop($field, $invocant->bug_id, $checked_id);
    }

    return $checked_id;
}

sub _check_textarea_field {
    my ($invocant, $text, $field) = @_;

    $text = (defined $text) ? trim($text) : '';

    # Web browsers submit newlines as \r\n.
    # Sanitize all input to match the web standard.
    # XMLRPC input could be either \n or \r\n
    $text =~ s/\r?\n/\r\n/g;

    return $text;
}

sub _check_relationship_loop {
    # Generates a dependency tree for a given bug.  Calls itself recursively
    # to generate sub-trees for the bug's dependencies.
    my ($field, $bug_id, $dep_id, $ids) = @_;

    # Don't do anything if this bug doesn't have any dependencies.
    return unless defined($dep_id);

    # Check whether we have seen this bug yet
    $ids = {} unless defined $ids;
    $ids->{$bug_id} = 1;
    if ($ids->{$dep_id}) {
        ThrowUserError("relationship_loop_single", {
            'bug_id' => $bug_id,
            'dep_id' => $dep_id,
            'field_name' => $field});
    }
    
    # Get this dependency's record from the database
    my $dbh = Bugzilla->dbh;
    my $next_dep_id = $dbh->selectrow_array(
        "SELECT $field FROM bugs WHERE bug_id = ?", undef, $dep_id);

    _check_relationship_loop($field, $dep_id, $next_dep_id, $ids);
}

#####################################################################
# Class Accessors
#####################################################################

sub fields {
    my $class = shift;

   my @fields =
   (
        # Standard Fields
        # Keep this ordering in sync with bugzilla.dtd.
        qw(bug_id alias creation_ts short_desc delta_ts
           reporter_accessible cclist_accessible
           classification_id classification
           product component version rep_platform op_sys
           bug_status resolution dup_id see_also
           bug_file_loc status_whiteboard keywords
           priority bug_severity target_milestone
           dependson blocked everconfirmed
           reporter assigned_to cc estimated_time
           remaining_time actual_time deadline),

        # Conditional Fields
        Bugzilla->params->{'useqacontact'} ? "qa_contact" : (),
        # Custom Fields
        map { $_->name } Bugzilla->active_custom_fields
    );
    Bugzilla::Hook::process('bug_fields', {'fields' => \@fields} );
    
    return @fields;
}

#####################################################################
# Mutators 
#####################################################################

# To run check_can_change_field.
sub _set_global_validator {
    my ($self, $value, $field) = @_;
    my $current = $self->$field;
    my $privs;

    if (ref $current && ref($current) ne 'ARRAY'
        && $current->isa('Bugzilla::Object')) {
        $current = $current->id ;
    }
    if (ref $value && ref($value) ne 'ARRAY'
        && $value->isa('Bugzilla::Object')) {
        $value = $value->id ;
    }
    my $can = $self->check_can_change_field($field, $current, $value, \$privs);
    if (!$can) {
        if ($field eq 'assigned_to' || $field eq 'qa_contact') {
            $value   = user_id_to_login($value);
            $current = user_id_to_login($current);
        }
        ThrowUserError('illegal_change', { field    => $field,
                                           oldvalue => $current,
                                           newvalue => $value,
                                           privs    => $privs });
    }
    $self->_check_field_is_mandatory($value, $field);
}


#################
# "Set" Methods #
#################

# Note that if you are changing multiple bugs at once, you must pass
# other_bugs to set_all in order for it to behave properly.
sub set_all {
    my $self = shift;
    my ($input_params) = @_;
    
    # Clone the data as we are going to alter it, and this would affect
    # subsequent bugs when calling set_all() again, as some fields would
    # be modified or no longer defined.
    my $params = {};
    %$params = %$input_params;

    # You cannot mark bugs as duplicate when changing several bugs at once
    # (because currently there is no way to check for duplicate loops in that
    # situation). You also cannot set the alias of several bugs at once.
    if ($params->{other_bugs} and scalar @{ $params->{other_bugs} } > 1) {
        ThrowUserError('dupe_not_allowed') if exists $params->{dup_id};
        ThrowUserError('multiple_alias_not_allowed') 
            if defined $params->{alias};
    }

    # For security purposes, and because lots of other checks depend on it,
    # we set the product first before anything else.
    my $product_changed; # Used only for strict_isolation checks.
    if (exists $params->{'product'}) {
        $product_changed = $self->_set_product($params->{'product'}, $params);
    }

    # strict_isolation checks mean that we should set the groups
    # immediately after changing the product.
    $self->_add_remove($params, 'groups');

    if (exists $params->{'dependson'} or exists $params->{'blocked'}) {
        my %set_deps;
        foreach my $name (qw(dependson blocked)) {
            my @dep_ids = @{ $self->$name };
            # If only one of the two fields was passed in, then we need to
            # retain the current value for the other one.
            if (!exists $params->{$name}) {
                $set_deps{$name} = \@dep_ids;
                next;
            }

            # Explicitly setting them to a particular value overrides
            # add/remove.
            if (exists $params->{$name}->{set}) {
                $set_deps{$name} = $params->{$name}->{set};
                next;
            }

            foreach my $add (@{ $params->{$name}->{add} || [] }) {
                push(@dep_ids, $add) if !grep($_ == $add, @dep_ids);
            }
            foreach my $remove (@{ $params->{$name}->{remove} || [] }) {
                @dep_ids = grep($_ != $remove, @dep_ids);
            }
            $set_deps{$name} = \@dep_ids;
        }

        $self->set_dependencies($set_deps{'dependson'}, $set_deps{'blocked'});
    }

    if (exists $params->{'keywords'}) {
        # Sorting makes the order "add, remove, set", just like for other
        # fields.
        foreach my $action (sort keys %{ $params->{'keywords'} }) {
            $self->modify_keywords($params->{'keywords'}->{$action}, $action);
        }
    }

    if (exists $params->{'comment'} or exists $params->{'work_time'}) {
        # Add a comment as needed to each bug. This is done early because
        # there are lots of things that want to check if we added a comment.
        $self->add_comment($params->{'comment'}->{'body'},
            { isprivate => $params->{'comment'}->{'is_private'},
              work_time => $params->{'work_time'} });
    }

    my %normal_set_all;
    foreach my $name (keys %$params) {
        # These are handled separately below.
        if ($self->can("set_$name")) {
            $normal_set_all{$name} = $params->{$name};
        }
    }
    $self->SUPER::set_all(\%normal_set_all);

    $self->reset_assigned_to if $params->{'reset_assigned_to'};
    $self->reset_qa_contact  if $params->{'reset_qa_contact'};

    $self->_add_remove($params, 'see_also');

    # And set custom fields.
    my @custom_fields = Bugzilla->active_custom_fields;
    foreach my $field (@custom_fields) {
        my $fname = $field->name;
        if (exists $params->{$fname}) {
            $self->set_custom_field($field, $params->{$fname});
        }
    }

    $self->_add_remove($params, 'cc');

    # Theoretically you could move a product without ever specifying
    # a new assignee or qa_contact, or adding/removing any CCs. So,
    # we have to check that the current assignee, qa, and CCs are still
    # valid if we've switched products, under strict_isolation. We can only
    # do that here, because if they *did* change the assignee, qa, or CC,
    # then we don't want to check the original ones, only the new ones.
    $self->_check_strict_isolation() if $product_changed;
}

# Helper for set_all that helps with fields that have an "add/remove"
# pattern instead of a "set_" pattern.
sub _add_remove {
    my ($self, $params, $name) = @_;
    my @add    = @{ $params->{$name}->{add}    || [] };
    my @remove = @{ $params->{$name}->{remove} || [] };
    $name =~ s/s$//;
    my $add_method = "add_$name";
    my $remove_method = "remove_$name";
    $self->$add_method($_) foreach @add;
    $self->$remove_method($_) foreach @remove;
}

sub set_alias { $_[0]->set('alias', $_[1]); }
sub set_assigned_to {
    my ($self, $value) = @_;
    $self->set('assigned_to', $value);
    # Store the old assignee. check_can_change_field() needs it.
    $self->{'_old_assigned_to'} = $self->{'assigned_to_obj'}->id;
    delete $self->{'assigned_to_obj'};
}
sub reset_assigned_to {
    my $self = shift;
    my $comp = $self->component_obj;
    $self->set_assigned_to($comp->default_assignee);
}
sub set_bug_ignored       { $_[0]->set('bug_ignored',       $_[1]); }
sub set_cclist_accessible { $_[0]->set('cclist_accessible', $_[1]); }
sub set_comment_is_private {
    my ($self, $comment_id, $isprivate) = @_;

    # We also allow people to pass in a hash of comment ids to update.
    if (ref $comment_id) {
        while (my ($id, $is) = each %$comment_id) {
            $self->set_comment_is_private($id, $is);
        }
        return;
    }

    my ($comment) = grep($comment_id == $_->id, @{ $self->comments });
    ThrowUserError('comment_invalid_isprivate', { id => $comment_id }) 
        if !$comment;

    $isprivate = $isprivate ? 1 : 0;
    if ($isprivate != $comment->is_private) {
        ThrowUserError('user_not_insider') if !Bugzilla->user->is_insider;
        $self->{comment_isprivate} ||= [];
        $comment->set_is_private($isprivate);
        push @{$self->{comment_isprivate}}, $comment;
    }
}
sub set_component  {
    my ($self, $name) = @_;
    my $old_comp  = $self->component_obj;
    my $component = $self->_check_component($name);
    if ($old_comp->id != $component->id) {
        $self->{component_id}  = $component->id;
        $self->{component}     = $component->name;
        $self->{component_obj} = $component;
        # For update()
        $self->{_old_component_name} = $old_comp->name;
        # Add in the Default CC of the new Component;
        foreach my $cc (@{$component->initial_cc}) {
            $self->add_cc($cc);
        }
    }
}
sub set_custom_field {
    my ($self, $field, $value) = @_;

    if (ref $value eq 'ARRAY' && $field->type != FIELD_TYPE_MULTI_SELECT) {
        $value = $value->[0];
    }
    ThrowCodeError('field_not_custom', { field => $field }) if !$field->custom;
    $self->set($field->name, $value);
}
sub set_deadline { $_[0]->set('deadline', $_[1]); }
sub set_dependencies {
    my ($self, $dependson, $blocked) = @_;
    my %extra = ( blocked => $blocked );
    $dependson = $self->_check_dependencies($dependson, 'dependson', \%extra);
    $blocked = $extra{blocked};
    # These may already be detainted, but all setters are supposed to
    # detaint their input if they've run a validator (just as though
    # we had used Bugzilla::Object::set), so we do that here.
    detaint_natural($_) foreach (@$dependson, @$blocked);
    $self->{'dependson'} = $dependson;
    $self->{'blocked'}   = $blocked;
    delete $self->{depends_on_obj};
    delete $self->{blocks_obj};
}
sub _clear_dup_id { $_[0]->{dup_id} = undef; }
sub set_dup_id {
    my ($self, $dup_id) = @_;
    my $old = $self->dup_id || 0;
    $self->set('dup_id', $dup_id);
    my $new = $self->dup_id;
    return if $old == $new;

    # Make sure that we have the DUPLICATE resolution. This is needed
    # if somebody calls set_dup_id without calling set_bug_status or
    # set_resolution.
    if ($self->resolution ne 'DUPLICATE') {
        # Even if the current status is VERIFIED, we change it back to
        # RESOLVED (or whatever the duplicate_or_move_bug_status is) here,
        # because that's the same thing the UI does when you click on the
        # "Mark as Duplicate" link. If people really want to retain their
        # current status, they can use set_bug_status and set the DUPLICATE
        # resolution before getting here.
        $self->set_bug_status(
            Bugzilla->params->{'duplicate_or_move_bug_status'},
            { resolution => 'DUPLICATE' });
    }
    
    # Update the other bug.
    my $dupe_of = new Bugzilla::Bug($self->dup_id);
    if (delete $self->{_add_dup_cc}) {
        $dupe_of->add_cc($self->reporter);
    }
    $dupe_of->add_comment("", { type       => CMT_HAS_DUPE,
                                extra_data => $self->id });
    $self->{_dup_for_update} = $dupe_of;
    
    # Now make sure that we add a duplicate comment on *this* bug.
    # (Change an existing comment into a dup comment, if there is one,
    # or add an empty dup comment.)
    if ($self->{added_comments}) {
        my @normal = grep { !defined $_->{type} || $_->{type} == CMT_NORMAL }
                          @{ $self->{added_comments} };
        # Turn the last one into a dup comment.
        $normal[-1]->{type} = CMT_DUPE_OF;
        $normal[-1]->{extra_data} = $self->dup_id;
    }
    else {
        $self->add_comment('', { type       => CMT_DUPE_OF,
                                 extra_data => $self->dup_id });
    }
}
sub set_estimated_time { $_[0]->set('estimated_time', $_[1]); }
sub _set_everconfirmed { $_[0]->set('everconfirmed', $_[1]); }
sub set_flags {
    my ($self, $flags, $new_flags) = @_;

    Bugzilla::Flag->set_flag($self, $_) foreach (@$flags, @$new_flags);
}
sub set_op_sys         { $_[0]->set('op_sys',        $_[1]); }
sub set_platform       { $_[0]->set('rep_platform',  $_[1]); }
sub set_priority       { $_[0]->set('priority',      $_[1]); }
# For security reasons, you have to use set_all to change the product.
# See the strict_isolation check in set_all for an explanation.
sub _set_product {
    my ($self, $name, $params) = @_;
    my $old_product = $self->product_obj;
    my $product = $self->_check_product($name);
    
    my $product_changed = 0;
    if ($old_product->id != $product->id) {
        $self->{product_id}  = $product->id;
        $self->{product}     = $product->name;
        $self->{product_obj} = $product;
        # For update()
        $self->{_old_product_name} = $old_product->name;
        # Delete fields that depend upon the old Product value.
        delete $self->{choices};
        $product_changed = 1;
    }

    $params ||= {};
    # We delete these so that they're not set again later in set_all.
    my $comp_name = delete $params->{component} || $self->component;
    my $vers_name = delete $params->{version}   || $self->version;
    my $tm_name   = delete $params->{target_milestone};
    # This way, if usetargetmilestone is off and we've changed products,
    # set_target_milestone will reset our target_milestone to
    # $product->default_milestone. But if we haven't changed products,
    # we don't reset anything.
    if (!defined $tm_name
        && (Bugzilla->params->{'usetargetmilestone'} || !$product_changed))
    {
        $tm_name = $self->target_milestone;
    }

    if ($product_changed && Bugzilla->usage_mode == USAGE_MODE_BROWSER) {
        # Try to set each value with the new product.
        # Have to set error_mode because Throw*Error calls exit() otherwise.
        my $old_error_mode = Bugzilla->error_mode;
        Bugzilla->error_mode(ERROR_MODE_DIE);
        my $component_ok = eval { $self->set_component($comp_name);      1; };
        my $version_ok   = eval { $self->set_version($vers_name);        1; };
        my $milestone_ok = 1;
        # Reporters can move bugs between products but not set the TM.
        if ($self->check_can_change_field('target_milestone', 0, 1)) {
            $milestone_ok = eval { $self->set_target_milestone($tm_name); 1; };
        }
        else {
            # Have to set this directly to bypass the validators.
            $self->{target_milestone} = $product->default_milestone;
        }
        # If there were any errors thrown, make sure we don't mess up any
        # other part of Bugzilla that checks $@.
        undef $@;
        Bugzilla->error_mode($old_error_mode);
        
        my $verified = $params->{product_change_confirmed};
        my %vars;
        if (!$verified || !$component_ok || !$version_ok || !$milestone_ok) {
            $vars{defaults} = {
                # Note that because of the eval { set } above, these are
                # already set correctly if they're valid, otherwise they're
                # set to some invalid value which the template will ignore.
                component => $self->component,
                version   => $self->version,
                milestone => $milestone_ok ? $self->target_milestone
                                           : $product->default_milestone
            };
            $vars{components} = [map { $_->name } grep($_->is_active, @{$product->components})];
            $vars{milestones} = [map { $_->name } grep($_->is_active, @{$product->milestones})];
            $vars{versions}   = [map { $_->name } grep($_->is_active, @{$product->versions})];
        }

        if (!$verified) {
            $vars{verify_bug_groups} = 1;
            my $dbh = Bugzilla->dbh;
            my @idlist = ($self->id);
            push(@idlist, map {$_->id} @{ $params->{other_bugs} })
                if $params->{other_bugs};
            @idlist = uniq @idlist;
            # Get the ID of groups which are no longer valid in the new product.
            my $gids = $dbh->selectcol_arrayref(
                'SELECT bgm.group_id
                   FROM bug_group_map AS bgm
                  WHERE bgm.bug_id IN (' . join(',', ('?') x @idlist) . ')
                    AND bgm.group_id NOT IN
                        (SELECT gcm.group_id
                           FROM group_control_map AS gcm
                           WHERE gcm.product_id = ?
                                 AND ( (gcm.membercontrol != ?
                                        AND gcm.group_id IN ('
                                        . Bugzilla->user->groups_as_string . '))
                                       OR gcm.othercontrol != ?) )',
                undef, (@idlist, $product->id, CONTROLMAPNA, CONTROLMAPNA));
            $vars{'old_groups'} = Bugzilla::Group->new_from_list($gids);

            # Did we come here from editing multiple bugs? (affects how we
            # show optional group changes)
            $vars{multiple_bugs} = (@idlist > 1) ? 1 : 0;
        }

        if (%vars) {
            $vars{product} = $product;
            $vars{bug} = $self;
            my $template = Bugzilla->template;
            $template->process("bug/process/verify-new-product.html.tmpl",
                \%vars) || ThrowTemplateError($template->error());
            exit;
        }
    }
    else {
        # When we're not in the browser (or we didn't change the product), we
        # just die if any of these are invalid.
        $self->set_component($comp_name);
        $self->set_version($vers_name);
        if ($product_changed 
            and !$self->check_can_change_field('target_milestone', 0, 1)) 
        {
            # Have to set this directly to bypass the validators.
            $self->{target_milestone} = $product->default_milestone;
        }
        else {
            $self->set_target_milestone($tm_name);
        }
    }

    if ($product_changed) {
        # Remove groups that can't be set in the new product.
        # We copy this array because the original array is modified while we're
        # working, and that confuses "foreach".
        my @current_groups = @{$self->groups_in};
        foreach my $group (@current_groups) {
            if (!$product->group_is_valid($group)) {
                $self->remove_group($group);
            }
        }

        # Make sure the bug is in all the mandatory groups for the new product.
        foreach my $group (@{$product->groups_mandatory}) {
            $self->add_group($group);
        }
    }
    
    return $product_changed;
}

sub set_qa_contact {
    my ($self, $value) = @_;
    $self->set('qa_contact', $value);
    # Store the old QA contact. check_can_change_field() needs it.
    if ($self->{'qa_contact_obj'}) {
        $self->{'_old_qa_contact'} = $self->{'qa_contact_obj'}->id;
    }
    delete $self->{'qa_contact_obj'};
}
sub reset_qa_contact {
    my $self = shift;
    my $comp = $self->component_obj;
    $self->set_qa_contact($comp->default_qa_contact);
}
sub set_remaining_time { $_[0]->set('remaining_time', $_[1]); }
# Used only when closing a bug or moving between closed states.
sub _zero_remaining_time { $_[0]->{'remaining_time'} = 0; }
sub set_reporter_accessible { $_[0]->set('reporter_accessible', $_[1]); }
sub set_resolution {
    my ($self, $value, $params) = @_;
    
    my $old_res = $self->resolution;
    $self->set('resolution', $value);
    delete $self->{choices};
    my $new_res = $self->resolution;

    if ($new_res ne $old_res) {
        # Clear the dup_id if we're leaving the dup resolution.
        if ($old_res eq 'DUPLICATE') {
            $self->_clear_dup_id();
        }
        # Duplicates should have no remaining time left.
        elsif ($new_res eq 'DUPLICATE' && $self->remaining_time != 0) {
            $self->_zero_remaining_time();
        }
    }
    
    # We don't check if we're entering or leaving the dup resolution here,
    # because we could be moving from being a dup of one bug to being a dup
    # of another, theoretically. Note that this code block will also run
    # when going between different closed states.
    if ($self->resolution eq 'DUPLICATE') {
        if (my $dup_id = $params->{dup_id}) {
            $self->set_dup_id($dup_id);
        }
        elsif (!$self->dup_id) {
            ThrowUserError('dupe_id_required');
        }
    }

    # This method has handled dup_id, so set_all doesn't have to worry
    # about it now.
    delete $params->{dup_id};
}
sub clear_resolution {
    my $self = shift;
    if (!$self->status->is_open) {
        ThrowUserError('resolution_cant_clear', { bug_id => $self->id });
    }
    $self->{'resolution'} = ''; 
    $self->_clear_dup_id; 
}
sub set_severity       { $_[0]->set('bug_severity',  $_[1]); }
sub set_bug_status {
    my ($self, $status, $params) = @_;
    my $old_status = $self->status;
    $self->set('bug_status', $status);
    delete $self->{'status'};
    delete $self->{'statuses_available'};
    delete $self->{'choices'};
    my $new_status = $self->status;
   
    if ($new_status->is_open) {
        # Check for the everconfirmed transition
        $self->_set_everconfirmed($new_status->name eq 'UNCONFIRMED' ? 0 : 1);
        $self->clear_resolution();
        # Calling clear_resolution handled the "resolution" and "dup_id"
        # setting, so set_all doesn't have to worry about them.
        delete $params->{resolution};
        delete $params->{dup_id};
    }
    else {
        # We do this here so that we can make sure closed statuses have
        # resolutions.
        my $resolution = $self->resolution;
        # We need to check "defined" to prevent people from passing
        # a blank resolution in the WebService, which would otherwise fail
        # silently.
        if (defined $params->{resolution}) {
            $resolution = delete $params->{resolution};
        }
        $self->set_resolution($resolution, $params);

        # Changing between closed statuses zeros the remaining time.
        if ($new_status->id != $old_status->id && $self->remaining_time != 0) {
            $self->_zero_remaining_time();
        }
    }
}
sub set_status_whiteboard { $_[0]->set('status_whiteboard', $_[1]); }
sub set_summary           { $_[0]->set('short_desc',        $_[1]); }
sub set_target_milestone  { $_[0]->set('target_milestone',  $_[1]); }
sub set_url               { $_[0]->set('bug_file_loc',      $_[1]); }
sub set_version           { $_[0]->set('version',           $_[1]); }

########################
# "Add/Remove" Methods #
########################

# These are in alphabetical order by field name.

# Accepts a User object or a username. Adds the user only if they
# don't already exist as a CC on the bug.
sub add_cc {
    my ($self, $user_or_name) = @_;
    return if !$user_or_name;
    my $user = ref $user_or_name ? $user_or_name
                                 : Bugzilla::User->check($user_or_name);
    $self->_check_strict_isolation_for_user($user);
    my $cc_users = $self->cc_users;
    push(@$cc_users, $user) if !grep($_->id == $user->id, @$cc_users);
}

# Accepts a User object or a username. Removes the User if they exist
# in the list, but doesn't throw an error if they don't exist.
sub remove_cc {
    my ($self, $user_or_name) = @_;
    my $user = ref $user_or_name ? $user_or_name
                                 : Bugzilla::User->check($user_or_name);
    my $currentUser = Bugzilla->user;
    if (!$self->user->{'canedit'} && $user->id != $currentUser->id) {
        ThrowUserError('cc_remove_denied');
    }
    my $cc_users = $self->cc_users;
    @$cc_users = grep { $_->id != $user->id } @$cc_users;
}

# $bug->add_comment("comment", {isprivate => 1, work_time => 10.5,
#                               type => CMT_NORMAL, extra_data => $data});
sub add_comment {
    my ($self, $comment, $params) = @_;

    $params ||= {};

    # Fill out info that doesn't change and callers may not pass in
    $params->{'bug_id'}  = $self;
    $params->{'thetext'} = defined($comment) ? $comment : '';

    # Validate all the entered data
    Bugzilla::Comment->check_required_create_fields($params);
    $params = Bugzilla::Comment->run_create_validators($params);

    # This makes it so we won't create new comments when there is nothing
    # to add 
    if ($params->{'thetext'} eq ''
        && !($params->{type} || abs($params->{work_time} || 0)))
    {
        return;
    }

    # If the user has explicitly set remaining_time, this will be overridden
    # later in set_all. But if they haven't, this keeps remaining_time
    # up-to-date.
    if ($params->{work_time}) {
        $self->set_remaining_time(max($self->remaining_time - $params->{work_time}, 0));
    }

    $self->{added_comments} ||= [];

    push(@{$self->{added_comments}}, $params);
}

# There was a lot of duplicate code when I wrote this as three separate
# functions, so I just combined them all into one. This is also easier for
# process_bug to use.
sub modify_keywords {
    my ($self, $keywords, $action) = @_;
    
    $action ||= 'set';
    if (!grep($action eq $_, qw(add remove set))) {
        $action = 'set';
    }
    
    $keywords = $self->_check_keywords($keywords);

    my (@result, $any_changes);
    if ($action eq 'set') {
        @result = @$keywords;
        # Check if anything was added or removed.
        my @old_ids = map { $_->id } @{$self->keyword_objects};
        my @new_ids = map { $_->id } @result;
        my ($removed, $added) = diff_arrays(\@old_ids, \@new_ids);
        $any_changes = scalar @$removed || scalar @$added;
    }
    else {
        # We're adding or deleting specific keywords.
        my %keys = map {$_->id => $_} @{$self->keyword_objects};
        if ($action eq 'add') {
            $keys{$_->id} = $_ foreach @$keywords;
        }
        else {
            delete $keys{$_->id} foreach @$keywords;
        }
        @result = values %keys;
        $any_changes = scalar @$keywords;
    }
    # Make sure we retain the sort order.
    @result = sort {lc($a->name) cmp lc($b->name)} @result;
    
    if ($any_changes) {
        my $privs;
        my $new = join(', ', (map {$_->name} @result));
        my $check = $self->check_can_change_field('keywords', 0, 1, \$privs)
            || ThrowUserError('illegal_change', { field    => 'keywords',
                                                  oldvalue => $self->keywords,
                                                  newvalue => $new,
                                                  privs    => $privs });
    }

    $self->{'keyword_objects'} = \@result;
}

sub add_group {
    my ($self, $group) = @_;

    # If the user enters "FoO" but the DB has "Foo", $group->name would
    # return "Foo" and thus revealing the existence of the group name.
    # So we have to store and pass the name as entered by the user to
    # the error message, if we have it.
    my $group_name = blessed($group) ? $group->name : $group;
    my $args = { name => $group_name, product => $self->product,
                 bug_id => $self->id, action => 'add' };

    $group = Bugzilla::Group->check_no_disclose($args) if !blessed $group;

    # If the bug is already in this group, then there is nothing to do.
    return if $self->in_group($group);


    # Make sure that bugs in this product can actually be restricted
    # to this group by the current user.
    $self->product_obj->group_is_settable($group)
         || ThrowUserError('group_restriction_not_allowed', $args);

    # OtherControl people can add groups only during a product change,
    # and only when the group is not NA for them.
    if (!Bugzilla->user->in_group($group->name)) {
        my $controls = $self->product_obj->group_controls->{$group->id};
        if (!$self->{_old_product_name}
            || $controls->{othercontrol} == CONTROLMAPNA)
        {
            ThrowUserError('group_restriction_not_allowed', $args);
        }
    }

    my $current_groups = $self->groups_in;
    push(@$current_groups, $group);
}

sub remove_group {
    my ($self, $group) = @_;

    # See add_group() for the reason why we store the user input.
    my $group_name = blessed($group) ? $group->name : $group;
    my $args = { name => $group_name, product => $self->product,
                 bug_id => $self->id, action => 'remove' };

    $group = Bugzilla::Group->check_no_disclose($args) if !blessed $group;

    # If the bug isn't in this group, then either the name is misspelled,
    # or the group really doesn't exist. Let the user know about this problem.
    $self->in_group($group) || ThrowUserError('group_invalid_removal', $args);

    # Check if this is a valid group for this product. You can *always*
    # remove a group that is not valid for this product (set_product does this).
    # This particularly happens when we're moving a bug to a new product.
    # You still have to be a member of an inactive group to remove it.
    if ($self->product_obj->group_is_valid($group)) {
        my $controls = $self->product_obj->group_controls->{$group->id};

        # Nobody can ever remove a Mandatory group, unless it became inactive.
        if ($controls->{membercontrol} == CONTROLMAPMANDATORY && $group->is_active) {
            ThrowUserError('group_invalid_removal', $args);
        }

        # OtherControl people can remove groups only during a product change,
        # and only when they are non-Mandatory and non-NA.
        if (!Bugzilla->user->in_group($group->name)) {
            if (!$self->{_old_product_name}
                || $controls->{othercontrol} == CONTROLMAPMANDATORY
                || $controls->{othercontrol} == CONTROLMAPNA)
            {
                ThrowUserError('group_invalid_removal', $args);
            }
        }
    }

    my $current_groups = $self->groups_in;
    @$current_groups = grep { $_->id != $group->id } @$current_groups;
}

sub add_see_also {
    my ($self, $input, $skip_recursion) = @_;

    # This is needed by xt/search.t.
    $input = $input->name if blessed($input);

    $input = trim($input);
    return if !$input;

    my ($class, $uri) = Bugzilla::BugUrl->class_for($input);

    my $params = { value => $uri, bug_id => $self, class => $class };
    $class->check_required_create_fields($params);

    my $field_values = $class->run_create_validators($params);
    my $value = $field_values->{value}->as_string;
    trick_taint($value);
    $field_values->{value} = $value;

    # We only add the new URI if it hasn't been added yet. URIs are
    # case-sensitive, but most of our DBs are case-insensitive, so we do
    # this check case-insensitively.
    if (!grep { lc($_->name) eq lc($value) } @{ $self->see_also }) {
        my $privs;
        my $can = $self->check_can_change_field('see_also', '', $value, \$privs);
        if (!$can) {
            ThrowUserError('illegal_change', { field    => 'see_also',
                                               newvalue => $value,
                                               privs    => $privs });
        }
        # If this is a link to a local bug then save the
        # ref bug id for sending changes email.
        my $ref_bug = delete $field_values->{ref_bug};
        if ($class->isa('Bugzilla::BugUrl::Bugzilla::Local')
            and !$skip_recursion
            and $ref_bug->check_can_change_field('see_also', '', $self->id, \$privs))
        {
            $ref_bug->add_see_also($self->id, 'skip_recursion');
            push @{ $self->{_update_ref_bugs} }, $ref_bug;
            push @{ $self->{see_also_changes} }, $ref_bug->id;
        }
        push @{ $self->{see_also} }, bless ($field_values, $class);
    }
}

sub remove_see_also {
    my ($self, $url, $skip_recursion) = @_;
    my $see_also = $self->see_also;

    # This is needed by xt/search.t.
    $url = $url->name if blessed($url);

    my ($removed_bug_url, $new_see_also) =
        part { lc($_->name) ne lc($url) } @$see_also;

    my $privs;
    my $can = $self->check_can_change_field('see_also', $see_also, $new_see_also, \$privs);
    if (!$can) {
        ThrowUserError('illegal_change', { field    => 'see_also',
                                           oldvalue => $url,
                                           privs    => $privs });
    }

    # Since we remove also the url from the referenced bug,
    # we need to notify changes for that bug too.
    $removed_bug_url = $removed_bug_url->[0];
    if (!$skip_recursion and $removed_bug_url
        and $removed_bug_url->isa('Bugzilla::BugUrl::Bugzilla::Local')
        and $removed_bug_url->ref_bug_url)
    {
        my $ref_bug
            = Bugzilla::Bug->check($removed_bug_url->ref_bug_url->bug_id);

        if (Bugzilla->user->can_edit_product($ref_bug->product_id)
            and $ref_bug->check_can_change_field('see_also', $self->id, '', \$privs))
        {
            my $self_url = $removed_bug_url->local_uri($self->id);
            $ref_bug->remove_see_also($self_url, 'skip_recursion');
            push @{ $self->{_update_ref_bugs} }, $ref_bug;
            push @{ $self->{see_also_changes} }, $ref_bug->id;
        }
    }

    $self->{see_also} = $new_see_also || [];
}

sub add_tag {
    my ($self, $tag) = @_;
    my $dbh = Bugzilla->dbh;
    my $user = Bugzilla->user;
    $tag = $self->_check_tag_name($tag);

    my $tag_id = $user->tags->{$tag}->{id};
    # If this tag doesn't exist for this user yet, create it.
    if (!$tag_id) {
        $dbh->do('INSERT INTO tag (user_id, name) VALUES (?, ?)',
                  undef, ($user->id, $tag));

        $tag_id = $dbh->selectrow_array('SELECT id FROM tag
                                         WHERE name = ? AND user_id = ?',
                                         undef, ($tag, $user->id));
        # The list has changed.
        delete $user->{tags};
    }
    # Do nothing if this tag is already set for this bug.
    return if grep { $_ eq $tag } @{$self->tags};

    # Increment the counter. Do it before the SQL call below,
    # to not count the tag twice.
    $user->tags->{$tag}->{bug_count}++;

    $dbh->do('INSERT INTO bug_tag (bug_id, tag_id) VALUES (?, ?)',
              undef, ($self->id, $tag_id));

    push(@{$self->{tags}}, $tag);
}

sub remove_tag {
    my ($self, $tag) = @_;
    my $dbh = Bugzilla->dbh;
    my $user = Bugzilla->user;
    $tag = $self->_check_tag_name($tag);

    my $tag_id = exists $user->tags->{$tag} ? $user->tags->{$tag}->{id} : undef;
    # Do nothing if the user doesn't use this tag, or didn't set it for this bug.
    return unless ($tag_id && grep { $_ eq $tag } @{$self->tags});

    $dbh->do('DELETE FROM bug_tag WHERE bug_id = ? AND tag_id = ?',
              undef, ($self->id, $tag_id));

    $self->{tags} = [grep { $_ ne $tag } @{$self->tags}];

    # Decrement the counter, and delete the tag if no bugs are using it anymore.
    if (!--$user->tags->{$tag}->{bug_count}) {
        $dbh->do('DELETE FROM tag WHERE name = ? AND user_id = ?',
                  undef, ($tag, $user->id));

        # The list has changed.
        delete $user->{tags};
    }
}

sub tags {
    my $self = shift;
    my $dbh = Bugzilla->dbh;
    my $user = Bugzilla->user;

    # This method doesn't support several users using the same bug object.
    if (!exists $self->{tags}) {
        $self->{tags} = $dbh->selectcol_arrayref(
            'SELECT name FROM bug_tag
             INNER JOIN tag ON tag.id = bug_tag.tag_id
             WHERE bug_id = ? AND user_id = ?',
             undef, ($self->id, $user->id));
    }
    return $self->{tags};
}

#####################################################################
# Simple Accessors
#####################################################################

# These are accessors that don't need to access the database.
# Keep them in alphabetical order.

sub alias               { return $_[0]->{alias}               }
sub bug_file_loc        { return $_[0]->{bug_file_loc}        }
sub bug_id              { return $_[0]->{bug_id}              }
sub bug_severity        { return $_[0]->{bug_severity}        }
sub bug_status          { return $_[0]->{bug_status}          }
sub cclist_accessible   { return $_[0]->{cclist_accessible}   }
sub component_id        { return $_[0]->{component_id}        }
sub creation_ts         { return $_[0]->{creation_ts}         }
sub estimated_time      { return $_[0]->{estimated_time}      }
sub deadline            { return $_[0]->{deadline}            }
sub delta_ts            { return $_[0]->{delta_ts}            }
sub error               { return $_[0]->{error}               }
sub everconfirmed       { return $_[0]->{everconfirmed}       }
sub lastdiffed          { return $_[0]->{lastdiffed}          }
sub op_sys              { return $_[0]->{op_sys}              }
sub priority            { return $_[0]->{priority}            }
sub product_id          { return $_[0]->{product_id}          }
sub remaining_time      { return $_[0]->{remaining_time}      }
sub reporter_accessible { return $_[0]->{reporter_accessible} }
sub rep_platform        { return $_[0]->{rep_platform}        }
sub resolution          { return $_[0]->{resolution}          }
sub short_desc          { return $_[0]->{short_desc}          }
sub status_whiteboard   { return $_[0]->{status_whiteboard}   }
sub target_milestone    { return $_[0]->{target_milestone}    }
sub version             { return $_[0]->{version}             }

#####################################################################
# Complex Accessors
#####################################################################

# These are accessors that have to access the database for additional
# information about a bug.

# These subs are in alphabetical order, as much as possible.
# If you add a new sub, please try to keep it in alphabetical order
# with the other ones.

# Note: If you add a new method, remember that you must check the error
# state of the bug before returning any data. If $self->{error} is
# defined, then return something empty. Otherwise you risk potential
# security holes.

sub dup_id {
    my ($self) = @_;
    return $self->{'dup_id'} if exists $self->{'dup_id'};

    $self->{'dup_id'} = undef;
    return if $self->{'error'};

    if ($self->{'resolution'} eq 'DUPLICATE') { 
        my $dbh = Bugzilla->dbh;
        $self->{'dup_id'} =
          $dbh->selectrow_array(q{SELECT dupe_of 
                                  FROM duplicates
                                  WHERE dupe = ?},
                                undef,
                                $self->{'bug_id'});
    }
    return $self->{'dup_id'};
}

sub _resolve_ultimate_dup_id {
    my ($bug_id, $dupe_of, $loops_are_an_error) = @_;
    my $dbh = Bugzilla->dbh;
    my $sth = $dbh->prepare('SELECT dupe_of FROM duplicates WHERE dupe = ?');

    my $this_dup = $dupe_of || $dbh->selectrow_array($sth, undef, $bug_id);
    my $last_dup = $bug_id;

    my %dupes;
    while ($this_dup) {
        if ($this_dup == $bug_id) {
            if ($loops_are_an_error) {
                ThrowUserError('dupe_loop_detected', { bug_id  => $bug_id,
                                                       dupe_of => $dupe_of });
            }
            else {
                return $last_dup;
            }
        }
        # If $dupes{$this_dup} is already set to 1, then a loop
        # already exists which does not involve this bug.
        # As the user is not responsible for this loop, do not
        # prevent him from marking this bug as a duplicate.
        return $last_dup if exists $dupes{$this_dup};
        $dupes{$this_dup} = 1;
        $last_dup = $this_dup;
        $this_dup = $dbh->selectrow_array($sth, undef, $this_dup);
    }

    return $last_dup;
}

sub actual_time {
    my ($self) = @_;
    return $self->{'actual_time'} if exists $self->{'actual_time'};

    if ( $self->{'error'} || !Bugzilla->user->is_timetracker ) {
        $self->{'actual_time'} = undef;
        return $self->{'actual_time'};
    }

    my $sth = Bugzilla->dbh->prepare("SELECT SUM(work_time)
                                      FROM longdescs 
                                      WHERE longdescs.bug_id=?");
    $sth->execute($self->{bug_id});
    $self->{'actual_time'} = $sth->fetchrow_array();
    return $self->{'actual_time'};
}

sub any_flags_requesteeble {
    my ($self) = @_;
    return $self->{'any_flags_requesteeble'} 
        if exists $self->{'any_flags_requesteeble'};
    return 0 if $self->{'error'};

    my $any_flags_requesteeble =
      grep { $_->is_requestable && $_->is_requesteeble } @{$self->flag_types};
    # Useful in case a flagtype is no longer requestable but a requestee
    # has been set before we turned off that bit.
    $any_flags_requesteeble ||= grep { $_->requestee_id } @{$self->flags};
    $self->{'any_flags_requesteeble'} = $any_flags_requesteeble;

    return $self->{'any_flags_requesteeble'};
}

sub attachments {
    my ($self) = @_;
    return $self->{'attachments'} if exists $self->{'attachments'};
    return [] if $self->{'error'};

    $self->{'attachments'} =
        Bugzilla::Attachment->get_attachments_by_bug($self, {preload => 1});
    return $self->{'attachments'};
}

sub assigned_to {
    my ($self) = @_;
    return $self->{'assigned_to_obj'} if exists $self->{'assigned_to_obj'};
    $self->{'assigned_to'} = 0 if $self->{'error'};
    $self->{'assigned_to_obj'} ||= new Bugzilla::User({ id => $self->{'assigned_to'}, cache => 1 });
    return $self->{'assigned_to_obj'};
}

sub blocked {
    my ($self) = @_;
    return $self->{'blocked'} if exists $self->{'blocked'};
    return [] if $self->{'error'};
    $self->{'blocked'} = EmitDependList("dependson", "blocked", $self->bug_id);
    return $self->{'blocked'};
}

sub blocks_obj {
    my ($self) = @_;
    $self->{blocks_obj} ||= $self->_bugs_in_order($self->blocked);
    return $self->{blocks_obj};
}

sub bug_group {
    my ($self) = @_;
    return join(', ', (map { $_->name } @{$self->groups_in}));
}

sub related_bugs {
    my ($self, $relationship) = @_;
    return [] if $self->{'error'};

    my $field_name = $relationship->name;
    $self->{'related_bugs'}->{$field_name} ||= $self->match({$field_name => $self->id});
    return $self->{'related_bugs'}->{$field_name}; 
}

sub cc {
    my ($self) = @_;
    return $self->{'cc'} if exists $self->{'cc'};
    return [] if $self->{'error'};

    my $dbh = Bugzilla->dbh;
    $self->{'cc'} = $dbh->selectcol_arrayref(
        q{SELECT profiles.login_name FROM cc, profiles
           WHERE bug_id = ?
             AND cc.who = profiles.userid
        ORDER BY profiles.login_name},
      undef, $self->bug_id);

    return $self->{'cc'};
}

# XXX Eventually this will become the standard "cc" method used everywhere.
sub cc_users {
    my $self = shift;
    return $self->{'cc_users'} if exists $self->{'cc_users'};
    return [] if $self->{'error'};
    
    my $dbh = Bugzilla->dbh;
    my $cc_ids = $dbh->selectcol_arrayref(
        'SELECT who FROM cc WHERE bug_id = ?', undef, $self->id);
    $self->{'cc_users'} = Bugzilla::User->new_from_list($cc_ids);
    return $self->{'cc_users'};
}

sub component {
    my ($self) = @_;
    return '' if $self->{error};
    $self->{component} //= $self->component_obj->name;
    return $self->{component};
}

# XXX Eventually this will replace component()
sub component_obj {
    my ($self) = @_;
    return $self->{component_obj} if defined $self->{component_obj};
    return {} if $self->{error};
    $self->{component_obj} =
        new Bugzilla::Component({ id => $self->{component_id}, cache => 1 });
    return $self->{component_obj};
}

sub classification_id {
    my ($self) = @_;
    return 0 if $self->{error};
    $self->{classification_id} //= $self->product_obj->classification_id;
    return $self->{classification_id};
}

sub classification {
    my ($self) = @_;
    return '' if $self->{error};
    $self->{classification} //= $self->product_obj->classification->name;
    return $self->{classification};
}

sub default_bug_status {
    my $class = shift;
    # XXX This should just call new_bug_statuses when the UI accepts closed
    # bug statuses instead of accepting them as a parameter.
    my @statuses = @_;

    my $status;
    if (scalar(@statuses) == 1) {
        $status = $statuses[0]->name;
    }
    else {
        $status = ($statuses[0]->name ne 'UNCONFIRMED')
                  ? $statuses[0]->name : $statuses[1]->name;
    }

    return $status;
}

sub dependson {
    my ($self) = @_;
    return $self->{'dependson'} if exists $self->{'dependson'};
    return [] if $self->{'error'};
    $self->{'dependson'} = 
        EmitDependList("blocked", "dependson", $self->bug_id);
    return $self->{'dependson'};
}

sub depends_on_obj {
    my ($self) = @_;
    $self->{depends_on_obj} ||= $self->_bugs_in_order($self->dependson);
    return $self->{depends_on_obj};
}

sub duplicates {
    my $self = shift;
    return $self->{duplicates} if exists $self->{duplicates};
    return [] if $self->{error};
    $self->{duplicates} = Bugzilla::Bug->new_from_list($self->duplicate_ids);
    return $self->{duplicates};
}

sub duplicate_ids {
    my $self = shift;
    return $self->{duplicate_ids} if exists $self->{duplicate_ids};
    return [] if $self->{error};

    my $dbh = Bugzilla->dbh;
    $self->{duplicate_ids} =
      $dbh->selectcol_arrayref('SELECT dupe FROM duplicates WHERE dupe_of = ?',
                               undef, $self->id);
    return $self->{duplicate_ids};
}

sub flag_types {
    my ($self) = @_;
    return $self->{'flag_types'} if exists $self->{'flag_types'};
    return [] if $self->{'error'};

    my $vars = { target_type  => 'bug',
                 product_id   => $self->{product_id},
                 component_id => $self->{component_id},
                 bug_id       => $self->bug_id };

    $self->{'flag_types'} = Bugzilla::Flag->_flag_types($vars);
    return $self->{'flag_types'};
}

sub flags {
    my $self = shift;

    # Don't cache it as it must be in sync with ->flag_types.
    $self->{flags} = [map { @{$_->{flags}} } @{$self->flag_types}];
    return $self->{flags};
}

sub isopened {
    my $self = shift;
    return is_open_state($self->{bug_status}) ? 1 : 0;
}

sub keywords {
    my ($self) = @_;
    return join(', ', (map { $_->name } @{$self->keyword_objects}));
}

# XXX At some point, this should probably replace the normal "keywords" sub.
sub keyword_objects {
    my $self = shift;
    return $self->{'keyword_objects'} if defined $self->{'keyword_objects'};
    return [] if $self->{'error'};

    my $dbh = Bugzilla->dbh;
    my $ids = $dbh->selectcol_arrayref(
         "SELECT keywordid FROM keywords WHERE bug_id = ?", undef, $self->id);
    $self->{'keyword_objects'} = Bugzilla::Keyword->new_from_list($ids);
    return $self->{'keyword_objects'};
}

sub comments {
    my ($self, $params) = @_;
    return [] if $self->{'error'};
    $params ||= {};

    if (!defined $self->{'comments'}) {
        $self->{'comments'} = Bugzilla::Comment->match({ bug_id => $self->id });
        my $count = 0;
        foreach my $comment (@{ $self->{'comments'} }) {
            $comment->{count} = $count++;
            $comment->{bug} = $self;
        }
        # Some bugs may have no comments when upgrading old installations.
        Bugzilla::Comment->preload($self->{'comments'}) if $count;
    }
    my @comments = @{ $self->{'comments'} };

    my $order = $params->{order} 
        || Bugzilla->user->setting('comment_sort_order');
    if ($order ne 'oldest_to_newest') {
        @comments = reverse @comments;
        if ($order eq 'newest_to_oldest_desc_first') {
            unshift(@comments, pop @comments);
        }
    }

    if ($params->{after}) {
        my $from = datetime_from($params->{after});
        @comments = grep { datetime_from($_->creation_ts) > $from } @comments;
    }
    if ($params->{to}) {
        my $to = datetime_from($params->{to});
        @comments = grep { datetime_from($_->creation_ts) <= $to } @comments;
    }
    return \@comments;
}

sub new_bug_statuses {
    my ($class, $product) = @_;
    my $user = Bugzilla->user;

    # Construct the list of allowable statuses.
    my @statuses = @{ Bugzilla::Bug->statuses_available($product) };

    # If the user has no privs...
    unless ($user->in_group('editbugs', $product->id)
            || $user->in_group('canconfirm', $product->id))
    {
        # ... use UNCONFIRMED if available, else use the first status of the list.
        my ($unconfirmed) = grep { $_->name eq 'UNCONFIRMED' } @statuses;
    
        # Because of an apparent Perl bug, "$unconfirmed || $statuses[0]" doesn't
        # work, so we're using an "?:" operator. See bug 603314 for details.
        @statuses = ($unconfirmed ? $unconfirmed : $statuses[0]);
    }

    return \@statuses;
}

# This is needed by xt/search.t.
sub percentage_complete {
    my $self = shift;
    return undef if $self->{'error'} || !Bugzilla->user->is_timetracker;
    my $remaining = $self->remaining_time;
    my $actual    = $self->actual_time;
    my $total = $remaining + $actual;
    return undef if $total == 0;
    # Search.pm truncates this value to an integer, so we want to as well,
    # since this is mostly used in a test where its value needs to be
    # identical to what the database will return.
    return int(100 * ($actual / $total));
}

sub product {
    my ($self) = @_;
    return '' if $self->{error};
    $self->{product} //= $self->product_obj->name;
    return $self->{product};
}

# XXX This should eventually replace the "product" subroutine.
sub product_obj {
    my $self = shift;
    return {} if $self->{error};
    $self->{product_obj} ||=
        new Bugzilla::Product({ id => $self->{product_id}, cache => 1 });
    return $self->{product_obj};
}

sub qa_contact {
    my ($self) = @_;
    return $self->{'qa_contact_obj'} if exists $self->{'qa_contact_obj'};
    return undef if $self->{'error'};

    if (Bugzilla->params->{'useqacontact'} && $self->{'qa_contact'}) {
        $self->{'qa_contact_obj'} = new Bugzilla::User({ id => $self->{'qa_contact'}, cache => 1 });
    } else {
        $self->{'qa_contact_obj'} = undef;
    }
    return $self->{'qa_contact_obj'};
}

sub reporter {
    my ($self) = @_;
    return $self->{'reporter'} if exists $self->{'reporter'};
    $self->{'reporter_id'} = 0 if $self->{'error'};
    $self->{'reporter'} = new Bugzilla::User({ id => $self->{'reporter_id'}, cache => 1 });
    return $self->{'reporter'};
}

sub see_also {
    my ($self) = @_;
    return [] if $self->{'error'};
    if (!exists $self->{see_also}) {
        my $ids = Bugzilla->dbh->selectcol_arrayref(
            'SELECT id FROM bug_see_also WHERE bug_id = ?',
            undef, $self->id);

        my $bug_urls = Bugzilla::BugUrl->new_from_list($ids);

        $self->{see_also} = $bug_urls;
    }
    return $self->{see_also};
}

sub status {
    my $self = shift;
    return undef if $self->{'error'};

    $self->{'status'} ||= new Bugzilla::Status({name => $self->{'bug_status'}});
    return $self->{'status'};
}

sub statuses_available {
    my ($invocant, $product) = @_;

    my @statuses;

    if (ref $invocant) {
      return [] if $invocant->{'error'};

      return $invocant->{'statuses_available'}
          if defined $invocant->{'statuses_available'};

        @statuses = @{ $invocant->status->can_change_to };
        $product = $invocant->product_obj;
    } else {
        @statuses = @{ Bugzilla::Status->can_change_to };
    }

    # UNCONFIRMED is only a valid status if it is enabled in this product.
    if (!$product->allows_unconfirmed) {
        @statuses = grep { $_->name ne 'UNCONFIRMED' } @statuses;
    }

    if (ref $invocant) {
        my $available = $invocant->_refine_available_statuses(@statuses);
        $invocant->{'statuses_available'} = $available;
        return $available;
    }

    return \@statuses;
}

sub _refine_available_statuses {
    my $self = shift;
    my @statuses = @_;

    my @available;
    foreach my $status (@statuses) {
        # Make sure this is a legal status transition
        next if !$self->check_can_change_field(
                     'bug_status', $self->status->name, $status->name);
        push(@available, $status);
    }

    # If this bug has an inactive status set, it should still be in the list.
    if (!grep($_->name eq $self->status->name, @available)) {
        unshift(@available, $self->status);
    }
    
    return \@available;
}

sub show_attachment_flags {
    my ($self) = @_;
    return $self->{'show_attachment_flags'} 
        if exists $self->{'show_attachment_flags'};
    return 0 if $self->{'error'};

    # The number of types of flags that can be set on attachments to this bug
    # and the number of flags on those attachments.  One of these counts must be
    # greater than zero in order for the "flags" column to appear in the table
    # of attachments.
    my $num_attachment_flag_types = Bugzilla::FlagType::count(
        { 'target_type'  => 'attachment',
          'product_id'   => $self->{'product_id'},
          'component_id' => $self->{'component_id'} });
    my $num_attachment_flags = Bugzilla::Flag->count(
        { 'target_type'  => 'attachment',
          'bug_id'       => $self->bug_id });

    $self->{'show_attachment_flags'} =
        ($num_attachment_flag_types || $num_attachment_flags);

    return $self->{'show_attachment_flags'};
}

sub groups {
    my $self = shift;
    return $self->{'groups'} if exists $self->{'groups'};
    return [] if $self->{'error'};

    my $dbh = Bugzilla->dbh;
    my @groups;

    # Some of this stuff needs to go into Bugzilla::User

    # For every group, we need to know if there is ANY bug_group_map
    # record putting the current bug in that group and if there is ANY
    # user_group_map record putting the user in that group.
    # The LEFT JOINs are checking for record existence.
    #
    my $grouplist = Bugzilla->user->groups_as_string;
    my $sth = $dbh->prepare(
             "SELECT DISTINCT groups.id, name, description," .
             " CASE WHEN bug_group_map.group_id IS NOT NULL" .
             " THEN 1 ELSE 0 END," .
             " CASE WHEN groups.id IN($grouplist) THEN 1 ELSE 0 END," .
             " isactive, membercontrol, othercontrol" .
             " FROM groups" . 
             " LEFT JOIN bug_group_map" .
             " ON bug_group_map.group_id = groups.id" .
             " AND bug_id = ?" .
             " LEFT JOIN group_control_map" .
             " ON group_control_map.group_id = groups.id" .
             " AND group_control_map.product_id = ? " .
             " WHERE isbuggroup = 1" .
             " ORDER BY description");
    $sth->execute($self->{'bug_id'},
                  $self->{'product_id'});

    while (my ($groupid, $name, $description, $ison, $ingroup, $isactive,
            $membercontrol, $othercontrol) = $sth->fetchrow_array()) {

        $membercontrol ||= 0;

        # For product groups, we only want to use the group if either
        # (1) The bit is set and not required, or
        # (2) The group is Shown or Default for members and
        #     the user is a member of the group.
        if ($ison ||
            ($isactive && $ingroup
                       && (($membercontrol == CONTROLMAPDEFAULT)
                           || ($membercontrol == CONTROLMAPSHOWN))
            ))
        {
            my $ismandatory = $isactive
              && ($membercontrol == CONTROLMAPMANDATORY);

            push (@groups, { "bit" => $groupid,
                             "name" => $name,
                             "ison" => $ison,
                             "ingroup" => $ingroup,
                             "mandatory" => $ismandatory,
                             "description" => $description });
        }
    }

    $self->{'groups'} = \@groups;

    return $self->{'groups'};
}

sub groups_in {
    my $self = shift;
    return $self->{'groups_in'} if exists $self->{'groups_in'};
    return [] if $self->{'error'};
    my $group_ids = Bugzilla->dbh->selectcol_arrayref(
        'SELECT group_id FROM bug_group_map WHERE bug_id = ?',
        undef, $self->id);
    $self->{'groups_in'} = Bugzilla::Group->new_from_list($group_ids);
    return $self->{'groups_in'};
}

sub in_group {
    my ($self, $group) = @_;
    return grep($_->id == $group->id, @{$self->groups_in}) ? 1 : 0;
}

sub user {
    my $self = shift;
    return $self->{'user'} if exists $self->{'user'};
    return {} if $self->{'error'};

    my $user = Bugzilla->user;
    my $prod_id = $self->{'product_id'};

    my $editbugs = $user->in_group('editbugs', $prod_id);
    my $is_reporter = $user->id == $self->{reporter_id} ? 1 : 0;
    my $is_assignee = $user->id == $self->{'assigned_to'} ? 1 : 0;
    my $is_qa_contact = Bugzilla->params->{'useqacontact'}
                        && $self->{'qa_contact'}
                        && $user->id == $self->{'qa_contact'} ? 1 : 0;

    my $canedit = $editbugs || $is_assignee || $is_qa_contact;
    my $canconfirm = $editbugs || $user->in_group('canconfirm', $prod_id);
    my $has_any_role = $is_reporter || $is_assignee || $is_qa_contact;

    $self->{'user'} = {canconfirm => $canconfirm,
                       canedit    => $canedit,
                       isreporter => $is_reporter,
                       has_any_role => $has_any_role};
    return $self->{'user'};
}

# This is intended to get values that can be selected by the user in the
# UI. It should not be used for security or validation purposes.
sub choices {
    my $self = shift;
    return $self->{'choices'} if exists $self->{'choices'};
    return {} if $self->{'error'};
    my $user = Bugzilla->user;

    my @products = @{ $user->get_enterable_products };
    # The current product is part of the popup, even if new bugs are no longer
    # allowed for that product
    if (!grep($_->name eq $self->product_obj->name, @products)) {
        unshift(@products, $self->product_obj);
    }
    my %class_ids = map { $_->classification_id => 1 } @products;
    my $classifications = 
        Bugzilla::Classification->new_from_list([keys %class_ids]);

    my %choices = (
        bug_status => $self->statuses_available,
        classification => $classifications,
        product    => \@products,
        component  => $self->product_obj->components,
        version    => $self->product_obj->versions,
        target_milestone => $self->product_obj->milestones,
    );

    my $resolution_field = new Bugzilla::Field({ name => 'resolution' });
    # Don't include the empty resolution in drop-downs.
    my @resolutions = grep($_->name, @{ $resolution_field->legal_values });
    $choices{'resolution'} = \@resolutions;

    $self->{'choices'} = \%choices;
    return $self->{'choices'};
}

# Convenience Function. If you need speed, use this. If you need
# other Bug fields in addition to this, just create a new Bug with
# the alias.
# Queries the database for the bug with a given alias, and returns
# the ID of the bug if it exists or the undefined value if it doesn't.
sub bug_alias_to_id {
    my ($alias) = @_;
    my $dbh = Bugzilla->dbh;
    trick_taint($alias);
    return $dbh->selectrow_array(
        "SELECT bug_id FROM bugs WHERE alias = ?", undef, $alias);
}

#####################################################################
# Subroutines
#####################################################################

# Returns a list of currently active and editable bug fields,
# including multi-select fields.
sub editable_bug_fields {
    my @fields = Bugzilla->dbh->bz_table_columns('bugs');
    # Add multi-select fields
    push(@fields, map { $_->name } @{Bugzilla->fields({obsolete => 0,
                                                       type => FIELD_TYPE_MULTI_SELECT})});
    # Obsolete custom fields are not editable.
    my @obsolete_fields = @{ Bugzilla->fields({obsolete => 1, custom => 1}) };
    @obsolete_fields = map { $_->name } @obsolete_fields;
    foreach my $remove ("bug_id", "reporter", "creation_ts", "delta_ts", 
                        "lastdiffed", @obsolete_fields) 
    {
        my $location = firstidx { $_ eq $remove } @fields;
        # Ensure field exists before attempting to remove it.
        splice(@fields, $location, 1) if ($location > -1);
    }
    return @fields;
}

# XXX - When Bug::update() will be implemented, we should make this routine
#       a private method.
# Join with bug_status and bugs tables to show bugs with open statuses first,
# and then the others
sub EmitDependList {
    my ($myfield, $targetfield, $bug_id) = (@_);
    my $dbh = Bugzilla->dbh;
    my $list_ref = $dbh->selectcol_arrayref(
          "SELECT $targetfield
             FROM dependencies
                  INNER JOIN bugs ON dependencies.$targetfield = bugs.bug_id
                  INNER JOIN bug_status ON bugs.bug_status = bug_status.value
            WHERE $myfield = ?
            ORDER BY is_open DESC, $targetfield",
            undef, $bug_id);
    return $list_ref;
}

# Creates a lot of bug objects in the same order as the input array.
sub _bugs_in_order {
    my ($self, $bug_ids) = @_;
    my $bugs = $self->new_from_list($bug_ids);
    my %bug_map = map { $_->id => $_ } @$bugs;
    my @result = map { $bug_map{$_} } @$bug_ids;
    return \@result;
}

# Get the activity of a bug, starting from $starttime (if given).
# This routine assumes Bugzilla::Bug->check has been previously called.
sub get_activity {
    my ($self, $attach_id, $starttime, $include_comment_tags) = @_;
    my $dbh = Bugzilla->dbh;
    my $user = Bugzilla->user;

    # Arguments passed to the SQL query.
    my @args = ($self->id);

    # Only consider changes since $starttime, if given.
    my $datepart = "";
    if (defined $starttime) {
        trick_taint($starttime);
        push (@args, $starttime);
        $datepart = "AND bug_when > ?";
    }

    my $attachpart = "";
    if ($attach_id) {
        push(@args, $attach_id);
        $attachpart = "AND bugs_activity.attach_id = ?";
    }

    # Only includes attachments the user is allowed to see.
    my $suppjoins = "";
    my $suppwhere = "";
    if (!$user->is_insider) {
        $suppjoins = "LEFT JOIN attachments 
                   ON attachments.attach_id = bugs_activity.attach_id";
        $suppwhere = "AND COALESCE(attachments.isprivate, 0) = 0";
    }

    my $query = "SELECT fielddefs.name, bugs_activity.attach_id, " .
        $dbh->sql_date_format('bugs_activity.bug_when', '%Y.%m.%d %H:%i:%s') .
            " AS bug_when, bugs_activity.removed, bugs_activity.added, profiles.login_name,
               bugs_activity.comment_id
          FROM bugs_activity
               $suppjoins
    INNER JOIN fielddefs
            ON bugs_activity.fieldid = fielddefs.id
    INNER JOIN profiles
            ON profiles.userid = bugs_activity.who
         WHERE bugs_activity.bug_id = ?
               $datepart
               $attachpart
               $suppwhere ";

    if (Bugzilla->params->{'comment_taggers_group'}
        && $include_comment_tags
        && !$attach_id)
    {
        # Only includes comment tag activity for comments the user is allowed to see.
        $suppjoins = "";
        $suppwhere = "";
        if (!Bugzilla->user->is_insider) {
            $suppjoins = "INNER JOIN longdescs
                          ON longdescs.comment_id = longdescs_tags_activity.comment_id";
            $suppwhere = "AND longdescs.isprivate = 0";
        }

        $query .= "
            UNION ALL
            SELECT 'comment_tag' AS name,
                   NULL AS attach_id," .
                   $dbh->sql_date_format('longdescs_tags_activity.bug_when', '%Y.%m.%d %H:%i:%s') . " AS bug_when,
                   longdescs_tags_activity.removed,
                   longdescs_tags_activity.added,
                   profiles.login_name,
                   longdescs_tags_activity.comment_id as comment_id
              FROM longdescs_tags_activity
                   INNER JOIN profiles ON profiles.userid = longdescs_tags_activity.who
                   $suppjoins
             WHERE longdescs_tags_activity.bug_id = ?
                   $datepart
                   $suppwhere
        ";
        push @args, $self->id;
        push @args, $starttime if defined $starttime;
    }

    $query .= "ORDER BY bug_when, comment_id";

    my $list = $dbh->selectall_arrayref($query, undef, @args);

    my @operations;
    my $operation = {};
    my $changes = [];
    my $incomplete_data = 0;

    foreach my $entry (@$list) {
        my ($fieldname, $attachid, $when, $removed, $added, $who, $comment_id) = @$entry;
        my %change;
        my $activity_visible = 1;

        # check if the user should see this field's activity
        if (grep { $fieldname eq $_ } TIMETRACKING_FIELDS) {
            $activity_visible = $user->is_timetracker;
        }
        elsif ($fieldname eq 'longdescs.isprivate'
               && !$user->is_insider && $added)
        { 
            $activity_visible = 0;
        } 
        else {
            $activity_visible = 1;
        }

        if ($activity_visible) {
            # Check for the results of an old Bugzilla data corruption bug
            if (($added eq '?' && $removed eq '?')
                || ($added =~ /^\? / || $removed =~ /^\? /)) {
                $incomplete_data = 1;
            }

            # An operation, done by 'who' at time 'when', has a number of
            # 'changes' associated with it.
            # If this is the start of a new operation, store the data from the
            # previous one, and set up the new one.
            if ($operation->{'who'}
                && ($who ne $operation->{'who'}
                    || $when ne $operation->{'when'}))
            {
                $operation->{'changes'} = $changes;
                push (@operations, $operation);

                # Create new empty anonymous data structures.
                $operation = {};
                $changes = [];
            }

            # If this is the same field as the previous item, then concatenate
            # the data into the same change.
            if ($operation->{'who'} && $who eq $operation->{'who'}
                && $when eq $operation->{'when'}
                && $fieldname eq $operation->{'fieldname'}
                && ($comment_id || 0) == ($operation->{'comment_id'} || 0)
                && ($attachid || 0) == ($operation->{'attachid'} || 0))
            {
                my $old_change = pop @$changes;
                $removed = join_activity_entries($fieldname, $old_change->{'removed'}, $removed);
                $added = join_activity_entries($fieldname, $old_change->{'added'}, $added);
            }
            $operation->{'who'} = $who;
            $operation->{'when'} = $when;
            $operation->{'fieldname'} = $change{'fieldname'} = $fieldname;
            $operation->{'attachid'} = $change{'attachid'} = $attachid;
            $change{'removed'} = $removed;
            $change{'added'} = $added;

            if ($comment_id) {
                $operation->{comment_id} = $change{'comment'} = Bugzilla::Comment->new($comment_id);
            }

            push (@$changes, \%change);
        }
    }

    if ($operation->{'who'}) {
        $operation->{'changes'} = $changes;
        push (@operations, $operation);
    }

    return(\@operations, $incomplete_data);
}

# Update the bugs_activity table to reflect changes made in bugs.
sub LogActivityEntry {
    my ($i, $col, $removed, $added, $whoid, $timestamp, $comment_id) = @_;
    my $sth = Bugzilla->dbh->prepare_cached(
      'INSERT INTO bugs_activity
       (bug_id, who, bug_when, fieldid, removed, added, comment_id)
       VALUES (?, ?, ?, ?, ?, ?, ?)');

    # in the case of CCs, deps, and keywords, there's a possibility that someone
    # might try to add or remove a lot of them at once, which might take more
    # space than the activity table allows.  We'll solve this by splitting it
    # into multiple entries if it's too long.
    while ($removed || $added) {
        my ($removestr, $addstr) = ($removed, $added);
        if (length($removestr) > MAX_LINE_LENGTH) {
            my $commaposition = find_wrap_point($removed, MAX_LINE_LENGTH);
            $removestr = substr($removed, 0, $commaposition);
            $removed = substr($removed, $commaposition);
        } else {
            $removed = ""; # no more entries
        }
        if (length($addstr) > MAX_LINE_LENGTH) {
            my $commaposition = find_wrap_point($added, MAX_LINE_LENGTH);
            $addstr = substr($added, 0, $commaposition);
            $added = substr($added, $commaposition);
        } else {
            $added = ""; # no more entries
        }
        trick_taint($addstr);
        trick_taint($removestr);
        my $fieldid = get_field_id($col);
        $sth->execute($i, $whoid, $timestamp, $fieldid, $removestr, $addstr, $comment_id);
    }
}

# Convert WebService API and email_in.pl field names to internal DB field
# names.
sub map_fields {
    my ($params, $except) = @_; 

    my %field_values;
    foreach my $field (keys %$params) {
        # Don't allow setting private fields via email_in or the WebService.
        next if $field =~ /^_/;
        my $field_name;
        if ($except->{$field}) {
           $field_name = $field;
        }
        else {
            $field_name = FIELD_MAP->{$field} || $field;
        }
        $field_values{$field_name} = $params->{$field};
    }
    return \%field_values;
}

################################################################################
# check_can_change_field() defines what users are allowed to change. You
# can add code here for site-specific policy changes, according to the
# instructions given in the Bugzilla Guide and below. Note that you may also
# have to update the Bugzilla::Bug::user() function to give people access to the
# options that they are permitted to change.
#
# check_can_change_field() returns true if the user is allowed to change this
# field, and false if they are not.
#
# The parameters to this method are as follows:
# $field    - name of the field in the bugs table the user is trying to change
# $oldvalue - what they are changing it from
# $newvalue - what they are changing it to
# $PrivilegesRequired - return the reason of the failure, if any
################################################################################
sub check_can_change_field {
    my $self = shift;
    my ($field, $oldvalue, $newvalue, $PrivilegesRequired) = (@_);
    my $user = Bugzilla->user;

    $oldvalue = defined($oldvalue) ? $oldvalue : '';
    $newvalue = defined($newvalue) ? $newvalue : '';

    # Return true if they haven't changed this field at all.
    if ($oldvalue eq $newvalue) {
        return 1;
    } elsif (ref($newvalue) eq 'ARRAY' && ref($oldvalue) eq 'ARRAY') {
        my ($removed, $added) = diff_arrays($oldvalue, $newvalue);
        return 1 if !scalar(@$removed) && !scalar(@$added);
    } elsif (trim($oldvalue) eq trim($newvalue)) {
        return 1;
    # numeric fields need to be compared using ==
    } elsif (($field eq 'estimated_time' || $field eq 'remaining_time' 
              || $field eq 'work_time')
             && $oldvalue == $newvalue)
    {
        return 1;
    }

    my @priv_results;
    Bugzilla::Hook::process('bug_check_can_change_field',
        { bug => $self, field => $field, 
          new_value => $newvalue, old_value => $oldvalue, 
          priv_results => \@priv_results });
    if (my $priv_required = first { $_ > 0 } @priv_results) {
        $$PrivilegesRequired = $priv_required;
        return 0;
    }
    my $allow_found = first { $_ == 0 } @priv_results;
    if (defined $allow_found) {
        return 1;
    }

    # Allow anyone to change comments, or set flags
    if ($field =~ /^longdesc/ || $field eq 'flagtypes.name') {
        return 1;
    }

    # If the user isn't allowed to change a field, we must tell him who can.
    # We store the required permission set into the $PrivilegesRequired
    # variable which gets passed to the error template.
    #
    # $PrivilegesRequired = PRIVILEGES_REQUIRED_NONE : no privileges required;
    # $PrivilegesRequired = PRIVILEGES_REQUIRED_REPORTER : the reporter, assignee or an empowered user;
    # $PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE : the assignee or an empowered user;
    # $PrivilegesRequired = PRIVILEGES_REQUIRED_EMPOWERED : an empowered user.

    # Only users in the time-tracking group can change time-tracking fields,
    # including the deadline.
    if (grep { $_ eq $field } (TIMETRACKING_FIELDS, 'deadline')) {
        if (!$user->is_timetracker) {
            $$PrivilegesRequired = PRIVILEGES_REQUIRED_EMPOWERED;
            return 0;
        }
    }

    # Allow anyone with (product-specific) "editbugs" privs to change anything.
    if ($user->in_group('editbugs', $self->{'product_id'})) {
        return 1;
    }

    # *Only* users with (product-specific) "canconfirm" privs can confirm bugs.
    if ($self->_changes_everconfirmed($field, $oldvalue, $newvalue)) {
        $$PrivilegesRequired = PRIVILEGES_REQUIRED_EMPOWERED;
        return $user->in_group('canconfirm', $self->{'product_id'});
    }

    # Make sure that a valid bug ID has been given.
    if (!$self->{'error'}) {
        # Allow the assignee to change anything else.
        if ($self->{'assigned_to'} == $user->id
            || $self->{'_old_assigned_to'} && $self->{'_old_assigned_to'} == $user->id)
        {
            return 1;
        }

        # Allow the QA contact to change anything else.
        if (Bugzilla->params->{'useqacontact'}
            && (($self->{'qa_contact'} && $self->{'qa_contact'} == $user->id)
                || ($self->{'_old_qa_contact'} && $self->{'_old_qa_contact'} == $user->id)))
        {
            return 1;
        }
    }

    # At this point, the user is either the reporter or an
    # unprivileged user. We first check for fields the reporter
    # is not allowed to change.

    # The reporter may not:
    # - reassign bugs, unless the bugs are assigned to him;
    #   in that case we will have already returned 1 above
    #   when checking for the assignee of the bug.
    if ($field eq 'assigned_to') {
        $$PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE;
        return 0;
    }
    # - change the QA contact
    if ($field eq 'qa_contact') {
        $$PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE;
        return 0;
    }
    # - change the target milestone
    if ($field eq 'target_milestone') {
        $$PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE;
        return 0;
    }
    # - change the priority (unless he could have set it originally)
    if ($field eq 'priority'
        && !Bugzilla->params->{'letsubmitterchoosepriority'})
    {
        $$PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE;
        return 0;
    }
    # - unconfirm bugs (confirming them is handled above)
    if ($field eq 'everconfirmed') {
        $$PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE;
        return 0;
    }
    # - change the status from one open state to another
    if ($field eq 'bug_status'
        && is_open_state($oldvalue) && is_open_state($newvalue)) 
    {
       $$PrivilegesRequired = PRIVILEGES_REQUIRED_ASSIGNEE;
       return 0;
    }

    # The reporter is allowed to change anything else.
    if (!$self->{'error'} && $self->{'reporter_id'} == $user->id) {
        return 1;
    }

    # If we haven't returned by this point, then the user doesn't
    # have the necessary permissions to change this field.
    $$PrivilegesRequired = PRIVILEGES_REQUIRED_REPORTER;
    return 0;
}

# A helper for check_can_change_field
sub _changes_everconfirmed {
    my ($self, $field, $old, $new) = @_;
    return 1 if $field eq 'everconfirmed';
    if ($field eq 'bug_status') {
        if ($self->everconfirmed) {
            # Moving a confirmed bug to UNCONFIRMED will change everconfirmed.
            return 1 if $new eq 'UNCONFIRMED';
        }
        else {
            # Moving an unconfirmed bug to an open state that isn't 
            # UNCONFIRMED will confirm the bug.
            return 1 if (is_open_state($new) and $new ne 'UNCONFIRMED');
        }
    }
    return 0;
}

#
# Field Validation
#

# Validate and return a hash of dependencies
sub ValidateDependencies {
    my $fields = {};
    # These can be arrayrefs or they can be strings.
    $fields->{'dependson'} = shift;
    $fields->{'blocked'} = shift;
    my $id = shift || 0;

    unless (defined($fields->{'dependson'})
            || defined($fields->{'blocked'}))
    {
        return;
    }

    my $dbh = Bugzilla->dbh;
    my %deps;
    my %deptree;
    foreach my $pair (["blocked", "dependson"], ["dependson", "blocked"]) {
        my ($me, $target) = @{$pair};
        $deptree{$target} = [];
        $deps{$target} = [];
        next unless $fields->{$target};

        my %seen;
        my $target_array = ref($fields->{$target}) ? $fields->{$target}
                           : [split(/[\s,]+/, $fields->{$target})];
        foreach my $i (@$target_array) {
            if ($id == $i) {
                ThrowUserError("dependency_loop_single");
            }
            if (!exists $seen{$i}) {
                push(@{$deptree{$target}}, $i);
                $seen{$i} = 1;
            }
        }
        # populate $deps{$target} as first-level deps only.
        # and find remainder of dependency tree in $deptree{$target}
        @{$deps{$target}} = @{$deptree{$target}};
        my @stack = @{$deps{$target}};
        while (@stack) {
            my $i = shift @stack;
            my $dep_list =
                $dbh->selectcol_arrayref("SELECT $target
                                          FROM dependencies
                                          WHERE $me = ?", undef, $i);
            foreach my $t (@$dep_list) {
                # ignore any _current_ dependencies involving this bug,
                # as they will be overwritten with data from the form.
                if ($t != $id && !exists $seen{$t}) {
                    push(@{$deptree{$target}}, $t);
                    push @stack, $t;
                    $seen{$t} = 1;
                }
            }
        }
    }

    my @deps   = @{$deptree{'dependson'}};
    my @blocks = @{$deptree{'blocked'}};
    my %union = ();
    my %isect = ();
    foreach my $b (@deps, @blocks) { $union{$b}++ && $isect{$b}++ }
    my @isect = keys %isect;
    if (scalar(@isect) > 0) {
        ThrowUserError("dependency_loop_multi", {'deps' => \@isect});
    }
    return %deps;
}


#####################################################################
# Custom Field Accessors
#####################################################################

sub _create_cf_accessors {
    my ($invocant) = @_;
    my $class = ref($invocant) || $invocant;
    return if Bugzilla->request_cache->{"${class}_cf_accessors_created"};

    my $fields = Bugzilla->fields({ custom => 1 });
    foreach my $field (@$fields) {
        my $accessor = $class->_accessor_for($field);
        my $name = "${class}::" . $field->name;
        {
            no strict 'refs';
            next if defined *{$name};
            *{$name} = $accessor;
        }
    }

    Bugzilla->request_cache->{"${class}_cf_accessors_created"} = 1;
}

sub _accessor_for {
    my ($class, $field) = @_;
    if ($field->type == FIELD_TYPE_MULTI_SELECT) {
        return $class->_multi_select_accessor($field->name);
    }
    return $class->_cf_accessor($field->name);
}

sub _cf_accessor {
    my ($class, $field) = @_;
    my $accessor = sub {
        my ($self) = @_;
        return $self->{$field};
    };
    return $accessor;
}

sub _multi_select_accessor {
    my ($class, $field) = @_;
    my $accessor = sub {
        my ($self) = @_;
        $self->{$field} ||= Bugzilla->dbh->selectcol_arrayref(
            "SELECT value FROM bug_$field WHERE bug_id = ? ORDER BY value",
            undef, $self->id);
        return $self->{$field};
    };
    return $accessor;
}

1;

=head1 B<Methods>

=over

=item C<initialize>

Ensures the accessors for custom fields are always created.

=back

=head1 B<Methods in need of POD>

=over

=item remove_cc

=item add_see_also

=item choices

=item keywords

=item blocked

=item qa_contact

=item add_comment

=item bug_severity

=item dup_id

=item set_priority

=item any_flags_requesteeble

=item set_bug_status

=item estimated_time

=item set_platform

=item statuses_available

=item set_custom_field

=item remove_see_also

=item remove_from_db

=item product_obj

=item reporter_accessible

=item set_summary

=item LogActivityEntry

=item set_assigned_to

=item add_group

=item bug_file_loc

=item DATE_COLUMNS

=item set_component

=item delta_ts

=item set_resolution

=item version

=item deadline

=item fields

=item dependson

=item check_can_change_field

=item update

=item set_op_sys

=item object_cache_key

=item bug_group

=item comments

=item map_fields

=item assigned_to

=item user

=item ValidateDependencies

=item short_desc

=item duplicate_ids

=item isopened

=item remaining_time

=item set_deadline

=item preload

=item groups_in

=item clear_resolution

=item set_estimated_time

=item in_group

=item status

=item get_activity

=item reporter

=item rep_platform

=item DB_COLUMNS

=item flag_types

=item bug_status

=item attachments

=item flags

=item set_flags

=item actual_time

=item component

=item UPDATE_COLUMNS

=item set_cclist_accessible

=item set_bug_ignored

=item product

=item VALIDATORS

=item show_attachment_flags

=item set_comment_is_private

=item set_severity

=item send_changes

=item add_tag

=item bug_id

=item reset_qa_contact

=item remove_group

=item set_alias

=item set_dup_id

=item set_target_milestone

=item cc_users

=item everconfirmed

=item check_is_visible

=item check_for_edit

=item match

=item VALIDATOR_DEPENDENCIES

=item possible_duplicates

=item set_url

=item add_cc

=item blocks_obj

=item set_status_whiteboard

=item product_id

=item error

=item reset_assigned_to

=item status_whiteboard

=item create

=item set_all

=item set_reporter_accessible

=item classification_id

=item tags

=item modify_keywords

=item priority

=item keyword_objects

=item set_dependencies

=item depends_on_obj

=item cclist_accessible

=item cc

=item duplicates

=item component_obj

=item see_also

=item groups

=item default_bug_status

=item related_bugs

=item editable_bug_fields

=item resolution

=item lastdiffed

=item classification

=item alias

=item op_sys

=item remove_tag

=item percentage_complete

=item EmitDependList

=item bug_alias_to_id

=item set_qa_contact

=item creation_ts

=item set_version

=item component_id

=item new_bug_statuses

=item set_remaining_time

=item target_milestone

=back