summaryrefslogtreecommitdiffstats
path: root/system/libraries/Upload.php
blob: 62eca6fdbff33cb011a4daa6226134a5615ad24f (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
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.2.4 or newer
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the Open Software License version 3.0
 *
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * File Uploading Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Uploads
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/file_uploading.html
 */
class CI_Upload {

	/**
	 * Maximum file size
	 *
	 * @var	int
	 */
	public $max_size		= 0;

	/**
	 * Maximum image width
	 *
	 * @var	int
	 */
	public $max_width		= 0;

	/**
	 * Maximum image height
	 *
	 * @var	int
	 */
	public $max_height		= 0;

	/**
	 * Minimum image width
	 *
	 * @var	int
	 */
	public $min_width		= 0;

	/**
	 * Minimum image height
	 *
	 * @var	int
	 */
	public $min_height		= 0;

	/**
	 * Maximum filename length
	 *
	 * @var	int
	 */
	public $max_filename		= 0;

	/**
	 * Maximum duplicate filename increment ID
	 *
	 * @var	int
	 */
	public $max_filename_increment 	= 100;

	/**
	 * Allowed file types
	 *
	 * @var	string
	 */
	public $allowed_types		= '';

	/**
	 * Temporary filename
	 *
	 * @var	string
	 */
	public $file_temp		= '';

	/**
	 * Filename
	 *
	 * @var	string
	 */
	public $file_name		= '';

	/**
	 * Original filename
	 *
	 * @var	string
	 */
	public $orig_name		= '';

	/**
	 * File type
	 *
	 * @var	string
	 */
	public $file_type		= '';

	/**
	 * File size
	 *
	 * @var	int
	 */
	public $file_size		= NULL;

	/**
	 * Filename extension
	 *
	 * @var	string
	 */
	public $file_ext		= '';

	/**
	 * Force filename extension to lowercase
	 *
	 * @var	string
	 */
	public $file_ext_tolower		= FALSE;

	/**
	 * Filename Rule
	 *
	 * @var	string
	 */
	public $filename_rule		= 'default';

	/**
	 * Upload path
	 *
	 * @var	string
	 */
	public $upload_path		= '';

	/**
	 * Overwrite flag
	 *
	 * @var	bool
	 */
	public $overwrite		= FALSE;

	/**
	 * Obfuscate filename flag
	 *
	 * @var	bool
	 */
	public $encrypt_name		= FALSE;

	/**
	 * Is image flag
	 *
	 * @var	bool
	 */
	public $is_image		= FALSE;

	/**
	 * Image width
	 *
	 * @var	int
	 */
	public $image_width		= NULL;

	/**
	 * Image height
	 *
	 * @var	int
	 */
	public $image_height		= NULL;

	/**
	 * Image type
	 *
	 * @var	string
	 */
	public $image_type		= '';

	/**
	 * Image size string
	 *
	 * @var	string
	 */
	public $image_size_str		= '';

	/**
	 * Error messages list
	 *
	 * @var	array
	 */
	public $error_msg		= array();

	/**
	 * MIME types list
	 *
	 * @var	array
	 */
	public $mimes			= array();

	/**
	 * Remove spaces flag
	 *
	 * @var	bool
	 */
	public $remove_spaces		= TRUE;

	/**
	 * MIME detection flag
	 *
	 * @var	bool
	 */
	public $detect_mime		= TRUE;

	/**
	 * XSS filter flag
	 *
	 * @var	bool
	 */
	public $xss_clean		= FALSE;

	/**
	 * Temporary filename prefix
	 *
	 * @var	string
	 */
	public $temp_prefix		= 'temp_file_';

	/**
	 * Filename sent by the client
	 *
	 * @var	bool
	 */
	public $client_name		= '';

	// --------------------------------------------------------------------

	/**
	 * Filename override
	 *
	 * @var	string
	 */
	protected $_file_name_override	= '';

	// --------------------------------------------------------------------

	/**
	 * Constructor
	 *
	 * @param	array	$props
	 * @return	void
	 */
	public function __construct($props = array())
	{
		if (count($props) > 0)
		{
			$this->initialize($props);
		}

		$this->mimes =& get_mimes();

		log_message('debug', 'Upload Class Initialized');
	}

	// --------------------------------------------------------------------

	/**
	 * Initialize preferences
	 *
	 * @param	array	$config
	 * @return	void
	 */
	public function initialize($config = array())
	{
		$defaults = array(
					'max_size'			=> 0,
					'max_width'			=> 0,
					'max_height'			=> 0,
					'min_width'			=> 0,
					'min_height'			=> 0,
					'max_filename'			=> 0,
					'max_filename_increment'	=> 100,
					'allowed_types'			=> '',
					'file_temp'			=> '',
					'file_name'			=> '',
					'orig_name'			=> '',
					'file_type'			=> '',
					'file_size'			=> NULL,
					'file_ext'			=> '',
					'file_ext_tolower' => FALSE,
					'upload_path'			=> '',
					'overwrite'			=> FALSE,
					'encrypt_name'			=> FALSE,
					'is_image'			=> FALSE,
					'image_width'			=> NULL,
					'image_height'			=> NULL,
					'image_type'			=> '',
					'image_size_str'		=> '',
					'error_msg'			=> array(),
					'remove_spaces'			=> TRUE,
					'detect_mime'			=> TRUE,
					'xss_clean'			=> FALSE,
					'temp_prefix'			=> 'temp_file_',
					'client_name'			=> '',
					'filename_rule'			=> 'default',
				);

		foreach ($defaults as $key => $val)
		{
			if (isset($config[$key]))
			{
				$method = 'set_'.$key;
				if (method_exists($this, $method))
				{
					$this->$method($config[$key]);
				}
				else
				{
					$this->$key = $config[$key];
				}
			}
			else
			{
				$this->$key = $val;
			}
		}

		// if a file_name was provided in the config, use it instead of the user input
		// supplied file name for all uploads until initialized again
		$this->_file_name_override = $this->file_name;
	}

	// --------------------------------------------------------------------

	/**
	 * Perform the file upload
	 *
	 * @param	string	$field
	 * @return	bool
	 */
	public function do_upload($field = 'userfile')
	{
		// Is $_FILES[$field] set? If not, no reason to continue.
		if ( ! isset($_FILES[$field]))
		{
			$this->set_error('upload_no_file_selected');
			return FALSE;
		}

		// Is the upload path valid?
		if ( ! $this->validate_upload_path())
		{
			// errors will already be set by validate_upload_path() so just return FALSE
			return FALSE;
		}

		// Was the file able to be uploaded? If not, determine the reason why.
		if ( ! is_uploaded_file($_FILES[$field]['tmp_name']))
		{
			$error = ( ! isset($_FILES[$field]['error'])) ? 4 : $_FILES[$field]['error'];

			switch ($error)
			{
				case UPLOAD_ERR_INI_SIZE:
					$this->set_error('upload_file_exceeds_limit');
					break;
				case UPLOAD_ERR_FORM_SIZE:
					$this->set_error('upload_file_exceeds_form_limit');
					break;
				case UPLOAD_ERR_PARTIAL:
					$this->set_error('upload_file_partial');
					break;
				case UPLOAD_ERR_NO_FILE:
					$this->set_error('upload_no_file_selected');
					break;
				case UPLOAD_ERR_NO_TMP_DIR:
					$this->set_error('upload_no_temp_directory');
					break;
				case UPLOAD_ERR_CANT_WRITE:
					$this->set_error('upload_unable_to_write_file');
					break;
				case UPLOAD_ERR_EXTENSION:
					$this->set_error('upload_stopped_by_extension');
					break;
				default:
					$this->set_error('upload_no_file_selected');
					break;
			}

			return FALSE;
		}

		// Set the uploaded data as class variables
		$this->file_temp = $_FILES[$field]['tmp_name'];
		$this->file_size = $_FILES[$field]['size'];

		// Skip MIME type detection?
		if ($this->detect_mime !== FALSE)
		{
			$this->_file_mime_type($_FILES[$field]);
		}

		$this->file_type = preg_replace('/^(.+?);.*$/', '\\1', $this->file_type);
		$this->file_type = strtolower(trim(stripslashes($this->file_type), '"'));
		$this->file_name = $this->_prep_filename($_FILES[$field]['name']);
		$this->file_ext	 = $this->get_extension($this->file_name);
		$this->client_name = $this->file_name;

		// Is the file type allowed to be uploaded?
		if ( ! $this->is_allowed_filetype())
		{
			$this->set_error('upload_invalid_filetype');
			return FALSE;
		}

		// if we're overriding, let's now make sure the new name and type is allowed
		if ($this->_file_name_override !== '')
		{
			$this->file_name = $this->_prep_filename($this->_file_name_override);

			// If no extension was provided in the file_name config item, use the uploaded one
			if (strpos($this->_file_name_override, '.') === FALSE)
			{
				$this->file_name .= $this->file_ext;
			}
			else
			{
				// An extension was provided, let's have it!
				$this->file_ext	= $this->get_extension($this->_file_name_override);
			}

			if ( ! $this->is_allowed_filetype(TRUE))
			{
				$this->set_error('upload_invalid_filetype');
				return FALSE;
			}
		}

		// Convert the file size to kilobytes
		if ($this->file_size > 0)
		{
			$this->file_size = round($this->file_size/1024, 2);
		}

		// Is the file size within the allowed maximum?
		if ( ! $this->is_allowed_filesize())
		{
			$this->set_error('upload_invalid_filesize');
			return FALSE;
		}

		// Are the image dimensions within the allowed size?
		// Note: This can fail if the server has an open_basdir restriction.
		if ( ! $this->is_allowed_dimensions())
		{
			$this->set_error('upload_invalid_dimensions');
			return FALSE;
		}

		// Sanitize the file name for security
		$CI =& get_instance();
		$this->file_name = $CI->security->sanitize_filename($this->file_name, FALSE, $this->filename_rule);

		// Truncate the file name if it's too long
		if ($this->max_filename > 0)
		{
			$this->file_name = $this->limit_filename_length($this->file_name, $this->max_filename);
		}

		// Remove white spaces in the name
		if ($this->remove_spaces === TRUE)
		{
			$this->file_name = preg_replace('/\s+/', '_', $this->file_name);
		}

		/*
		 * Validate the file name
		 * This function appends an number onto the end of
		 * the file if one with the same name already exists.
		 * If it returns false there was a problem.
		 */
		$this->orig_name = $this->file_name;

		if ($this->overwrite === FALSE)
		{
			$this->file_name = $this->set_filename($this->upload_path, $this->file_name);

			if ($this->file_name === FALSE)
			{
				return FALSE;
			}
		}

		/*
		 * Run the file through the XSS hacking filter
		 * This helps prevent malicious code from being
		 * embedded within a file. Scripts can easily
		 * be disguised as images or other file types.
		 */
		if ($this->xss_clean && $this->do_xss_clean() === FALSE)
		{
			$this->set_error('upload_unable_to_write_file');
			return FALSE;
		}

		/*
		 * Move the file to the final destination
		 * To deal with different server configurations
		 * we'll attempt to use copy() first. If that fails
		 * we'll use move_uploaded_file(). One of the two should
		 * reliably work in most environments
		 */
		if ( ! @copy($this->file_temp, $this->upload_path.$this->file_name))
		{
			if ( ! @move_uploaded_file($this->file_temp, $this->upload_path.$this->file_name))
			{
				$this->set_error('upload_destination_error');
				return FALSE;
			}
		}

		/*
		 * Set the finalized image dimensions
		 * This sets the image width/height (assuming the
		 * file was an image). We use this information
		 * in the "data" function.
		 */
		$this->set_image_properties($this->upload_path.$this->file_name);

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Finalized Data Array
	 *
	 * Returns an associative array containing all of the information
	 * related to the upload, allowing the developer easy access in one array.
	 *
	 * @param	string	$index
	 * @return	mixed
	 */
	public function data($index = NULL)
	{
		$data = array(
				'file_name'		=> $this->file_name,
				'file_type'		=> $this->file_type,
				'file_path'		=> $this->upload_path,
				'full_path'		=> $this->upload_path.$this->file_name,
				'raw_name'		=> str_replace($this->file_ext, '', $this->file_name),
				'orig_name'		=> $this->orig_name,
				'client_name'		=> $this->client_name,
				'file_ext'		=> $this->file_ext,
				'file_size'		=> $this->file_size,
				'is_image'		=> $this->is_image(),
				'image_width'		=> $this->image_width,
				'image_height'		=> $this->image_height,
				'image_type'		=> $this->image_type,
				'image_size_str'	=> $this->image_size_str,
			);

		if ( ! empty($index))
		{
			return isset($data[$index]) ? $data[$index] : NULL;
		}

		return $data;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Upload Path
	 *
	 * @param	string	$path
	 * @return	void
	 */
	public function set_upload_path($path)
	{
		// Make sure it has a trailing slash
		$this->upload_path = rtrim($path, '/').'/';
	}

	// --------------------------------------------------------------------

	/**
	 * Set the file name
	 *
	 * This function takes a filename/path as input and looks for the
	 * existence of a file with the same name. If found, it will append a
	 * number to the end of the filename to avoid overwriting a pre-existing file.
	 *
	 * @param	string	$path
	 * @param	string	$filename
	 * @return	string
	 */
	public function set_filename($path, $filename)
	{
		if ($this->encrypt_name === TRUE)
		{
			$filename = md5(uniqid(mt_rand())).$this->file_ext;
		}

		if ( ! file_exists($path.$filename))
		{
			return $filename;
		}

		$filename = str_replace($this->file_ext, '', $filename);

		$new_filename = '';
		for ($i = 1; $i < $this->max_filename_increment; $i++)
		{
			if ( ! file_exists($path.$filename.$i.$this->file_ext))
			{
				$new_filename = $filename.$i.$this->file_ext;
				break;
			}
		}

		if ($new_filename === '')
		{
			$this->set_error('upload_bad_filename');
			return FALSE;
		}
		else
		{
			return $new_filename;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Set Maximum File Size
	 *
	 * @param	int	$n
	 * @return	void
	 */
	public function set_max_filesize($n)
	{
		$this->max_size = ((int) $n < 0) ? 0 : (int) $n;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Maximum File Name Length
	 *
	 * @param	int	$n
	 * @return	void
	 */
	public function set_max_filename($n)
	{
		$this->max_filename = ((int) $n < 0) ? 0 : (int) $n;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Maximum Image Width
	 *
	 * @param	int	$n
	 * @return	void
	 */
	public function set_max_width($n)
	{
		$this->max_width = ((int) $n < 0) ? 0 : (int) $n;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Maximum Image Height
	 *
	 * @param	int	$n
	 * @return	void
	 */
	public function set_max_height($n)
	{
		$this->max_height = ((int) $n < 0) ? 0 : (int) $n;
	}

	// --------------------------------------------------------------------

	/**
	 * Set minimum image width
	 *
	 * @param	int	$n
	 * @return	void
	 */
	public function set_min_width($n)
	{
		$this->min_width = ((int) $n < 0) ? 0 : (int) $n;
	}

	// --------------------------------------------------------------------

	/**
	 * Set minimum image height
	 *
	 * @param	int	$n
	 * @return	void
	 */
	public function set_min_height($n)
	{
		$this->min_height = ((int) $n < 0) ? 0 : (int) $n;
	}

	// --------------------------------------------------------------------

	/**
	 * Set Allowed File Types
	 *
	 * @param	string	$types
	 * @return	void
	 */
	public function set_allowed_types($types)
	{
		if ( ! is_array($types) && $types === '*')
		{
			$this->allowed_types = '*';
			return;
		}
		$this->allowed_types = explode('|', $types);
	}

	// --------------------------------------------------------------------

	/**
	 * Set Image Properties
	 *
	 * Uses GD to determine the width/height/type of image
	 *
	 * @param	string	$path
	 * @return	void
	 */
	public function set_image_properties($path = '')
	{
		if ( ! $this->is_image())
		{
			return;
		}

		if (function_exists('getimagesize'))
		{
			if (FALSE !== ($D = @getimagesize($path)))
			{
				$types = array(1 => 'gif', 2 => 'jpeg', 3 => 'png');

				$this->image_width	= $D[0];
				$this->image_height	= $D[1];
				$this->image_type	= isset($types[$D[2]]) ? $types[$D[2]] : 'unknown';
				$this->image_size_str	= $D[3]; // string containing height and width
			}
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Set XSS Clean
	 *
	 * Enables the XSS flag so that the file that was uploaded
	 * will be run through the XSS filter.
	 *
	 * @param	bool	$flag
	 * @return	void
	 */
	public function set_xss_clean($flag = FALSE)
	{
		$this->xss_clean = ($flag === TRUE);
	}

	// --------------------------------------------------------------------

	/**
	 * Validate the image
	 *
	 * @return	bool
	 */
	public function is_image()
	{
		// IE will sometimes return odd mime-types during upload, so here we just standardize all
		// jpegs or pngs to the same file type.

		$png_mimes  = array('image/x-png');
		$jpeg_mimes = array('image/jpg', 'image/jpe', 'image/jpeg', 'image/pjpeg');

		if (in_array($this->file_type, $png_mimes))
		{
			$this->file_type = 'image/png';
		}
		elseif (in_array($this->file_type, $jpeg_mimes))
		{
			$this->file_type = 'image/jpeg';
		}

		$img_mimes = array('image/gif',	'image/jpeg', 'image/png');

		return in_array($this->file_type, $img_mimes, TRUE);
	}

	// --------------------------------------------------------------------

	/**
	 * Verify that the filetype is allowed
	 *
	 * @param	bool	$ignore_mime
	 * @return	bool
	 */
	public function is_allowed_filetype($ignore_mime = FALSE)
	{
		if ($this->allowed_types === '*')
		{
			return TRUE;
		}

		if ( ! is_array($this->allowed_types) OR count($this->allowed_types) === 0)
		{
			$this->set_error('upload_no_file_types');
			return FALSE;
		}

		$ext = strtolower(ltrim($this->file_ext, '.'));

		if ( ! in_array($ext, $this->allowed_types))
		{
			return FALSE;
		}

		// Images get some additional checks
		$image_types = array('gif', 'jpg', 'jpeg', 'png', 'jpe');

		if (in_array($ext, $image_types) && @getimagesize($this->file_temp) === FALSE)
		{
			return FALSE;
		}

		if ($ignore_mime === TRUE)
		{
			return TRUE;
		}

		$mime = $this->mimes_types($ext);

		if (is_array($mime) && in_array($this->file_type, $mime, TRUE))
		{
			return TRUE;
		}
		elseif ($mime === $this->file_type)
		{
			return TRUE;
		}

		return FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Verify that the file is within the allowed size
	 *
	 * @return	bool
	 */
	public function is_allowed_filesize()
	{
		return ($this->max_size === 0 OR $this->max_size > $this->file_size);
	}

	// --------------------------------------------------------------------

	/**
	 * Verify that the image is within the allowed width/height
	 *
	 * @return	bool
	 */
	public function is_allowed_dimensions()
	{
		if ( ! $this->is_image())
		{
			return TRUE;
		}

		if (function_exists('getimagesize'))
		{
			$D = @getimagesize($this->file_temp);

			if ($this->max_width > 0 && $D[0] > $this->max_width)
			{
				return FALSE;
			}

			if ($this->max_height > 0 && $D[1] > $this->max_height)
			{
				return FALSE;
			}

			if ($this->min_width > 0 && $D[0] < $this->min_width)
			{
				return FALSE;
			}

			if ($this->min_height > 0 && $D[1] < $this->min_height)
			{
				return FALSE;
			}
		}

		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Validate Upload Path
	 *
	 * Verifies that it is a valid upload path with proper permissions.
	 *
	 * @return	bool
	 */
	public function validate_upload_path()
	{
		if ($this->upload_path === '')
		{
			$this->set_error('upload_no_filepath');
			return FALSE;
		}

		if (@realpath($this->upload_path) !== FALSE)
		{
			$this->upload_path = str_replace('\\', '/', realpath($this->upload_path));
		}

		if ( ! @is_dir($this->upload_path))
		{
			$this->set_error('upload_no_filepath');
			return FALSE;
		}

		if ( ! is_really_writable($this->upload_path))
		{
			$this->set_error('upload_not_writable');
			return FALSE;
		}

		$this->upload_path = preg_replace('/(.+?)\/*$/', '\\1/',  $this->upload_path);
		return TRUE;
	}

	// --------------------------------------------------------------------

	/**
	 * Extract the file extension
	 *
	 * @param	string	$filename
	 * @return	string
	 */
	public function get_extension($filename)
	{
		$x = explode('.', $filename);

		if (count($x) === 1)
		{
		    return '';
		}

		$ext = ($this->file_ext_tolower) ? strtolower(end($x)) : end($x);
		return '.'.$ext;
	}

	// --------------------------------------------------------------------

	/**
	 * Limit the File Name Length
	 *
	 * @param	string	$filename
	 * @param	int	$length
	 * @return	string
	 */
	public function limit_filename_length($filename, $length)
	{
		if (strlen($filename) < $length)
		{
			return $filename;
		}

		$ext = '';
		if (strpos($filename, '.') !== FALSE)
		{
			$parts		= explode('.', $filename);
			$ext		= '.'.array_pop($parts);
			$filename	= implode('.', $parts);
		}

		return substr($filename, 0, ($length - strlen($ext))).$ext;
	}

	// --------------------------------------------------------------------

	/**
	 * Runs the file through the XSS clean function
	 *
	 * This prevents people from embedding malicious code in their files.
	 * I'm not sure that it won't negatively affect certain files in unexpected ways,
	 * but so far I haven't found that it causes trouble.
	 *
	 * @return	void
	 */
	public function do_xss_clean()
	{
		$file = $this->file_temp;

		if (filesize($file) == 0)
		{
			return FALSE;
		}

		if (memory_get_usage() && ($memory_limit = ini_get('memory_limit')))
		{
			$memory_limit *= 1024 * 1024;

			// There was a bug/behavioural change in PHP 5.2, where numbers over one million get output
			// into scientific notation. number_format() ensures this number is an integer
			// http://bugs.php.net/bug.php?id=43053

			$memory_limit = number_format(ceil(filesize($file) + $memory_limit), 0, '.', '');

			ini_set('memory_limit', $memory_limit); // When an integer is used, the value is measured in bytes. - PHP.net
		}

		// If the file being uploaded is an image, then we should have no problem with XSS attacks (in theory), but
		// IE can be fooled into mime-type detecting a malformed image as an html file, thus executing an XSS attack on anyone
		// using IE who looks at the image. It does this by inspecting the first 255 bytes of an image. To get around this
		// CI will itself look at the first 255 bytes of an image to determine its relative safety. This can save a lot of
		// processor power and time if it is actually a clean image, as it will be in nearly all instances _except_ an
		// attempted XSS attack.

		if (function_exists('getimagesize') && @getimagesize($file) !== FALSE)
		{
			if (($file = @fopen($file, 'rb')) === FALSE) // "b" to force binary
			{
				return FALSE; // Couldn't open the file, return FALSE
			}

			$opening_bytes = fread($file, 256);
			fclose($file);

			// These are known to throw IE into mime-type detection chaos
			// <a, <body, <head, <html, <img, <plaintext, <pre, <script, <table, <title
			// title is basically just in SVG, but we filter it anyhow

			// if it's an image or no "triggers" detected in the first 256 bytes - we're good
			return ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes);
		}

		if (($data = @file_get_contents($file)) === FALSE)
		{
			return FALSE;
		}

		$CI =& get_instance();
		return $CI->security->xss_clean($data, TRUE);
	}

	// --------------------------------------------------------------------

	/**
	 * Set an error message
	 *
	 * @param	string	$msg
	 * @return	void
	 */
	public function set_error($msg)
	{
		$CI =& get_instance();
		$CI->lang->load('upload');

		if ( ! is_array($msg))
		{
			$msg = array($msg);
		}

		foreach ($msg as $val)
		{
			$msg = ($CI->lang->line($val) === FALSE) ? $val : $CI->lang->line($val);
			$this->error_msg[] = $msg;
			log_message('error', $msg);
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Display the error message
	 *
	 * @param	string	$open
	 * @param	string	$close
	 * @return	string
	 */
	public function display_errors($open = '<p>', $close = '</p>')
	{
		return (count($this->error_msg) > 0) ? $open.implode($close.$open, $this->error_msg).$close : '';
	}

	// --------------------------------------------------------------------

	/**
	 * List of Mime Types
	 *
	 * This is a list of mime types. We use it to validate
	 * the "allowed types" set by the developer
	 *
	 * @param	string	$mime
	 * @return	string
	 */
	public function mimes_types($mime)
	{
		return isset($this->mimes[$mime]) ? $this->mimes[$mime] : FALSE;
	}

	// --------------------------------------------------------------------

	/**
	 * Prep Filename
	 *
	 * Prevents possible script execution from Apache's handling
	 * of files' multiple extensions.
	 *
	 * @link	http://httpd.apache.org/docs/1.3/mod/mod_mime.html#multipleext
	 *
	 * @param	string	$filename
	 * @return	string
	 */
	protected function _prep_filename($filename)
	{
		if (strpos($filename, '.') === FALSE OR $this->allowed_types === '*')
		{
			return $filename;
		}

		$parts		= explode('.', $filename);
		$ext		= array_pop($parts);
		$filename	= array_shift($parts);

		foreach ($parts as $part)
		{
			if ( ! in_array(strtolower($part), $this->allowed_types) OR $this->mimes_types(strtolower($part)) === FALSE)
			{
				$filename .= '.'.$part.'_';
			}
			else
			{
				$filename .= '.'.$part;
			}
		}

		return $filename.'.'.$ext;
	}

	// --------------------------------------------------------------------

	/**
	 * File MIME type
	 *
	 * Detects the (actual) MIME type of the uploaded file, if possible.
	 * The input array is expected to be $_FILES[$field]
	 *
	 * @param	array	$file
	 * @return	void
	 */
	protected function _file_mime_type($file)
	{
		// We'll need this to validate the MIME info string (e.g. text/plain; charset=us-ascii)
		$regexp = '/^([a-z\-]+\/[a-z0-9\-\.\+]+)(;\s.+)?$/';

		/* Fileinfo extension - most reliable method
		 *
		 * Unfortunately, prior to PHP 5.3 - it's only available as a PECL extension and the
		 * more convenient FILEINFO_MIME_TYPE flag doesn't exist.
		 */
		if (function_exists('finfo_file'))
		{
			$finfo = @finfo_open(FILEINFO_MIME);
			if (is_resource($finfo)) // It is possible that a FALSE value is returned, if there is no magic MIME database file found on the system
			{
				$mime = @finfo_file($finfo, $file['tmp_name']);
				finfo_close($finfo);

				/* According to the comments section of the PHP manual page,
				 * it is possible that this function returns an empty string
				 * for some files (e.g. if they don't exist in the magic MIME database)
				 */
				if (is_string($mime) && preg_match($regexp, $mime, $matches))
				{
					$this->file_type = $matches[1];
					return;
				}
			}
		}

		/* This is an ugly hack, but UNIX-type systems provide a "native" way to detect the file type,
		 * which is still more secure than depending on the value of $_FILES[$field]['type'], and as it
		 * was reported in issue #750 (https://github.com/EllisLab/CodeIgniter/issues/750) - it's better
		 * than mime_content_type() as well, hence the attempts to try calling the command line with
		 * three different functions.
		 *
		 * Notes:
		 *	- the DIRECTORY_SEPARATOR comparison ensures that we're not on a Windows system
		 *	- many system admins would disable the exec(), shell_exec(), popen() and similar functions
		 *	  due to security concerns, hence the function_usable() checks
		 */
		if (DIRECTORY_SEPARATOR !== '\\')
		{
			$cmd = function_exists('escapeshellarg')
				? 'file --brief --mime '.escapeshellarg($file['tmp_name']).' 2>&1'
				: 'file --brief --mime '.$file['tmp_name'].' 2>&1';

			if (function_usable('exec'))
			{
				/* This might look confusing, as $mime is being populated with all of the output when set in the second parameter.
				 * However, we only need the last line, which is the actual return value of exec(), and as such - it overwrites
				 * anything that could already be set for $mime previously. This effectively makes the second parameter a dummy
				 * value, which is only put to allow us to get the return status code.
				 */
				$mime = @exec($cmd, $mime, $return_status);
				if ($return_status === 0 && is_string($mime) && preg_match($regexp, $mime, $matches))
				{
					$this->file_type = $matches[1];
					return;
				}
			}

			if ( (bool) @ini_get('safe_mode') === FALSE && function_usable('shell_exec'))
			{
				$mime = @shell_exec($cmd);
				if (strlen($mime) > 0)
				{
					$mime = explode("\n", trim($mime));
					if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))
					{
						$this->file_type = $matches[1];
						return;
					}
				}
			}

			if (function_usable('popen'))
			{
				$proc = @popen($cmd, 'r');
				if (is_resource($proc))
				{
					$mime = @fread($proc, 512);
					@pclose($proc);
					if ($mime !== FALSE)
					{
						$mime = explode("\n", trim($mime));
						if (preg_match($regexp, $mime[(count($mime) - 1)], $matches))
						{
							$this->file_type = $matches[1];
							return;
						}
					}
				}
			}
		}

		// Fall back to the deprecated mime_content_type(), if available (still better than $_FILES[$field]['type'])
		if (function_exists('mime_content_type'))
		{
			$this->file_type = @mime_content_type($file['tmp_name']);
			if (strlen($this->file_type) > 0) // It's possible that mime_content_type() returns FALSE or an empty string
			{
				return;
			}
		}

		$this->file_type = $file['type'];
	}

}

/* End of file Upload.php */
/* Location: ./system/libraries/Upload.php */