summaryrefslogtreecommitdiffstats
path: root/Bugzilla.pm
blob: d3b1a59709fff098a64949dfb24deb06f6c5f0f2 (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
# -*- Mode: perl; indent-tabs-mode: nil -*-
#
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is the Bugzilla Bug Tracking System.
#
# The Initial Developer of the Original Code is Netscape Communications
# Corporation. Portions created by Netscape are
# Copyright (C) 1998 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s): Bradley Baetz <bbaetz@student.usyd.edu.au>
#                 Erik Stambaugh <erik@dasbistro.com>
#

package Bugzilla;

use strict;

use Bugzilla::Auth;
use Bugzilla::Auth::Login::WWW;
use Bugzilla::CGI;
use Bugzilla::Config;
use Bugzilla::Constants;
use Bugzilla::DB;
use Bugzilla::Template;
use Bugzilla::User;
use Bugzilla::Error;
use Bugzilla::Util;

use File::Basename;

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

# Scripts that are not stopped by shutdownhtml being in effect.
use constant SHUTDOWNHTML_EXEMPT => [
    'doeditparams.cgi',
    'editparams.cgi',
    'checksetup.pl',
];

#####################################################################
# Global Code
#####################################################################

# If Bugzilla is shut down, do not allow anything to run, just display a
# message to the user about the downtime.  Scripts listed in 
# SHUTDOWNHTML_EXEMPT are exempt from this message.
#
# This code must go here. It cannot go anywhere in Bugzilla::CGI, because
# it uses Template, and that causes various dependency loops.
if (Param("shutdownhtml") 
    && lsearch(SHUTDOWNHTML_EXEMPT, basename($0)) == -1) 
{
    my $template = Bugzilla->template;
    my $vars = {};
    $vars->{'message'} = 'shutdown';
    # Generate and return a message about the downtime, appropriately
    # for if we're a command-line script or a CGI sript.
    my $extension;
    if (i_am_cgi() && (!Bugzilla->cgi->param('format') 
                       || Bugzilla->cgi->param('format') eq 'html')) {
        $extension = 'html';
    }
    else {
        $extension = 'txt';
    }
    print Bugzilla->cgi->header() if i_am_cgi();
    my $t_output;
    $template->process("global/message.$extension.tmpl", $vars, \$t_output)
        || ThrowTemplateError($template->error);
    print $t_output . "\n";
    exit;
}

#####################################################################
# Subroutines and Methods
#####################################################################

my $_template;
sub template {
    my $class = shift;
    $_template ||= Bugzilla::Template->create();
    return $_template;
}

my $_cgi;
sub cgi {
    my $class = shift;
    $_cgi ||= new Bugzilla::CGI();
    return $_cgi;
}

my $_user;
sub user {
    my $class = shift;

    if (not defined $_user) {
        $_user = new Bugzilla::User;
    }

    return $_user;
}

sub login {
    my ($class, $type) = @_;
    $_user = Bugzilla::Auth::Login::WWW->login($type);
}

sub logout {
    my ($class, $option) = @_;

    # If we're not logged in, go away
    return unless user->id;

    $option = LOGOUT_CURRENT unless defined $option;
    Bugzilla::Auth::Login::WWW->logout($_user, $option);
}

sub logout_user {
    my ($class, $user) = @_;
    # When we're logging out another user we leave cookies alone, and
    # therefore avoid calling Bugzilla->logout() directly.
    Bugzilla::Auth::Login::WWW->logout($user, LOGOUT_ALL);
}

# just a compatibility front-end to logout_user that gets a user by id
sub logout_user_by_id {
    my ($class, $id) = @_;
    my $user = new Bugzilla::User($id);
    $class->logout_user($user);
}

# hack that invalidates credentials for a single request
sub logout_request {
    undef $_user;
    # XXX clean this up eventually
    $::userid = 0;
    # We can't delete from $cgi->cookie, so logincookie data will remain
    # there. Don't rely on it: use Bugzilla->user->login instead!
}

my $_dbh;
my $_dbh_main;
my $_dbh_shadow;
sub dbh {
    my $class = shift;

    # If we're not connected, then we must want the main db
    if (!$_dbh) {
        $_dbh = $_dbh_main = Bugzilla::DB::connect_main();
    }

    return $_dbh;
}

my $_batch;
sub batch {
    my $class = shift;
    my $newval = shift;
    if ($newval) {
        $_batch = $newval;
    }
    return $_batch || 0;
}

sub dbwritesallowed {
    my $class = shift;

    # We can write if we are connected to the main database.
    # Note that if we don't have a shadowdb, then we claim that its ok
    # to write even if we're nominally connected to the shadowdb.
    # This is OK because this method is only used to test if misc
    # updates can be done, rather than anything complicated.
    return $class->dbh == $_dbh_main;
}

sub switch_to_shadow_db {
    my $class = shift;

    if (!$_dbh_shadow) {
        if (Param('shadowdb')) {
            $_dbh_shadow = Bugzilla::DB::connect_shadow();
        } else {
            $_dbh_shadow = $_dbh_main;
        }
    }

    $_dbh = $_dbh_shadow;
}

sub switch_to_main_db {
    my $class = shift;

    $_dbh = $_dbh_main;
}

# Private methods

# Per process cleanup
sub _cleanup {
    undef $_cgi;
    undef $_user;

    # See bug 192531. If we don't clear the possibly active statement handles,
    # then when this is called from the END block, it happens _before_ the
    # destructors in Bugzilla::DB have happened.
    # See http://rt.perl.org/rt2/Ticket/Display.html?id=17450#38810
    # Without disconnecting explicitly here, noone notices, because DBI::END
    # ends up calling DBD::mysql's $drh->disconnect_all, which is a noop.
    # This code is evil, but it needs to be done, at least until SendSQL and
    # friends can be removed
    @Bugzilla::DB::SQLStateStack = ();
    undef $Bugzilla::DB::_current_sth;

    # When we support transactions, need to ->rollback here
    $_dbh_main->disconnect if $_dbh_main;
    $_dbh_shadow->disconnect if $_dbh_shadow and Param("shadowdb");
    undef $_dbh_main;
    undef $_dbh_shadow;
    undef $_dbh;
}

sub END {
    _cleanup();
}

1;

__END__

=head1 NAME

Bugzilla - Semi-persistent collection of various objects used by scripts
and modules

=head1 SYNOPSIS

  use Bugzilla;

  sub someModulesSub {
    Bugzilla->dbh->prepare(...);
    Bugzilla->template->process(...);
  }

=head1 DESCRIPTION

Several Bugzilla 'things' are used by a variety of modules and scripts. This
includes database handles, template objects, and so on.

This module is a singleton intended as a central place to store these objects.
This approach has several advantages:

=over 4

=item *

They're not global variables, so we don't have issues with them staying arround
with mod_perl

=item *

Everything is in one central place, so its easy to access, modify, and maintain

=item *

Code in modules can get access to these objects without having to have them
all passed from the caller, and the caller's caller, and....

=item *

We can reuse objects across requests using mod_perl where appropriate (eg
templates), whilst destroying those which are only valid for a single request
(such as the current user)

=back

Note that items accessible via this object are demand-loaded when requested.

For something to be added to this object, it should either be able to benefit
from persistence when run under mod_perl (such as the a C<template> object),
or should be something which is globally required by a large ammount of code
(such as the current C<user> object).

=head1 METHODS

Note that all C<Bugzilla> functionality is method based; use C<Bugzilla-E<gt>dbh>
rather than C<Bugzilla::dbh>. Nothing cares about this now, but don't rely on
that.

=over 4

=item C<template>

The current C<Template> object, to be used for output

=item C<cgi>

The current C<cgi> object. Note that modules should B<not> be using this in
general. Not all Bugzilla actions are cgi requests. Its useful as a convenience
method for those scripts/templates which are only use via CGI, though.

=item C<user>

The current C<Bugzilla::User>. C<undef> if there is no currently logged in user
or if the login code has not yet been run.

=item C<login>

Logs in a user, returning a C<Bugzilla::User> object, or C<undef> if there is
no logged in user. See L<Bugzilla::Auth|Bugzilla::Auth>, and
L<Bugzilla::User|Bugzilla::User>.

=item C<logout($option)>

Logs out the current user, which involves invalidating user sessions and
cookies. Three options are available from
L<Bugzilla::Constants|Bugzilla::Constants>: LOGOUT_CURRENT (the
default), LOGOUT_ALL or LOGOUT_KEEP_CURRENT.

=item C<logout_user($user)>

Logs out the specified user (invalidating all his sessions), taking a
Bugzilla::User instance.

=item C<logout_by_id($id)>

Logs out the user with the id specified. This is a compatibility
function to be used in callsites where there is only a userid and no
Bugzilla::User instance.

=item C<logout_request>

Essentially, causes calls to C<Bugzilla-E<gt>user> to return C<undef>. This has the
effect of logging out a user for the current request only; cookies and
database sessions are left intact.

=item C<batch>

Set to true, by calling Bugzilla->batch(1), to indicate that Bugzilla is
being called in a non-interactive manner and errors should be passed to 
die() rather than being sent to a browser and finished with an exit().
Bugzilla->batch will return the current state of this flag.

=item C<dbh>

The current database handle. See L<DBI>.

=item C<dbwritesallowed>

Determines if writes to the database are permitted. This is usually used to
determine if some general cleanup needs to occur (such as clearing the token
table)

=item C<switch_to_shadow_db>

Switch from using the main database to using the shadow database.

=item C<switch_to_main_db>

Change the database object to refer to the main database.

=back