summaryrefslogtreecommitdiffstats
path: root/Bugzilla/Error.pm
blob: 03bf04f83aceabccdd1d90e329d09a6a7402d1b4 (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
# 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::Error;

use 5.10.1;
use strict;

use parent qw(Exporter);

@Bugzilla::Error::EXPORT = qw(ThrowCodeError ThrowTemplateError ThrowUserError);

use Bugzilla::Constants;
use Bugzilla::WebService::Constants;
use Bugzilla::Hook;

use Carp;
use Data::Dumper;
use Date::Format;

# We cannot use $^S to detect if we are in an eval(), because mod_perl
# already eval'uates everything, so $^S = 1 in all cases under mod_perl!
sub _in_eval {
    my $in_eval = 0;
    for (my $stack = 1; my $sub = (caller($stack))[3]; $stack++) {
        last if $sub =~ /^ModPerl/;
        $in_eval = 1 if $sub =~ /^\(eval\)/;
    }
    return $in_eval;
}

sub _throw_error {
    my ($name, $error, $vars) = @_;
    my $dbh = Bugzilla->dbh;
    $vars ||= {};

    $vars->{error} = $error;

    # Make sure any transaction is rolled back (if supported).
    # If we are within an eval(), do not roll back transactions as we are
    # eval'uating some test on purpose.
    $dbh->bz_rollback_transaction() if ($dbh->bz_in_transaction() && !_in_eval());

    my $datadir = bz_locations()->{'datadir'};
    # If a writable $datadir/errorlog exists, log error details there.
    if (-w "$datadir/errorlog") {
        require Bugzilla::Util;
        require Data::Dumper;
        my $mesg = "";
        for (1..75) { $mesg .= "-"; };
        $mesg .= "\n[$$] " . time2str("%D %H:%M:%S ", time());
        $mesg .= "$name $error ";
        $mesg .= Bugzilla::Util::remote_ip();
        $mesg .= Bugzilla->user->login;
        $mesg .= (' actually ' . Bugzilla->sudoer->login) if Bugzilla->sudoer;
        $mesg .= "\n";
        my %params = Bugzilla->cgi->Vars;
        $Data::Dumper::Useqq = 1;
        for my $param (sort keys %params) {
            my $val = $params{$param};
            # obscure passwords
            $val = "*****" if $param =~ /password/i;
            # limit line length
            $val =~ s/^(.{512}).*$/$1\[CHOP\]/;
            $mesg .= "[$$] " . Data::Dumper->Dump([$val],["param($param)"]);
        }
        for my $var (sort keys %ENV) {
            my $val = $ENV{$var};
            $val = "*****" if $val =~ /password|http_pass/i;
            $mesg .= "[$$] " . Data::Dumper->Dump([$val],["env($var)"]);
        }
        open(ERRORLOGFID, ">>$datadir/errorlog");
        print ERRORLOGFID "$mesg\n";
        close ERRORLOGFID;
    }

    my $template = Bugzilla->template;
    my $message;
    # There are some tests that throw and catch a lot of errors,
    # and calling $template->process over and over for those errors
    # is too slow. So instead, we just "die" with a dump of the arguments.
    if (Bugzilla->error_mode != ERROR_MODE_TEST) {
        $template->process($name, $vars, \$message)
          || ThrowTemplateError($template->error());
    }

    # Let's call the hook first, so that extensions can override
    # or extend the default behavior, or add their own error codes.
    Bugzilla::Hook::process('error_catch', { error => $error, vars => $vars,
                                             message => \$message });

    if (Bugzilla->error_mode == ERROR_MODE_WEBPAGE) {
        my $cgi = Bugzilla->cgi;
        $cgi->close_standby_message('text/html', 'inline', 'error', 'html');
        print $message;
        print $cgi->multipart_final() if $cgi->{_multipart_in_progress};
    }
    elsif (Bugzilla->error_mode == ERROR_MODE_TEST) {
        die Dumper($vars);
    }
    elsif (Bugzilla->error_mode == ERROR_MODE_DIE) {
        die("$message\n");
    }
    elsif (Bugzilla->error_mode == ERROR_MODE_DIE_SOAP_FAULT
           || Bugzilla->error_mode == ERROR_MODE_JSON_RPC
           || Bugzilla->error_mode == ERROR_MODE_REST)
    {
        # Clone the hash so we aren't modifying the constant.
        my %error_map = %{ WS_ERROR_CODE() };
        Bugzilla::Hook::process('webservice_error_codes',
                                { error_map => \%error_map });
        my $code = $error_map{$error};
        if (!$code) {
            $code = ERROR_UNKNOWN_FATAL if $name =~ /code/i;
            $code = ERROR_UNKNOWN_TRANSIENT if $name =~ /user/i;
        }

        if (Bugzilla->error_mode == ERROR_MODE_DIE_SOAP_FAULT) {
            die SOAP::Fault->faultcode($code)->faultstring($message);
        }
        else {
            my $server = Bugzilla->_json_server;

            my $status_code = 0;
            if (Bugzilla->error_mode == ERROR_MODE_REST) {
                my %status_code_map = %{ REST_STATUS_CODE_MAP() };
                $status_code = $status_code_map{$code} || $status_code_map{'_default'};
            }
            # Technically JSON-RPC isn't allowed to have error numbers
            # higher than 999, but we do this to avoid conflicts with
            # the internal JSON::RPC error codes.
            $server->raise_error(code        => 100000 + $code,
                                 status_code => $status_code,
                                 message     => $message,
                                 id          => $server->{_bz_request_id},
                                 version     => $server->version);
            # Most JSON-RPC Throw*Error calls happen within an eval inside
            # of JSON::RPC. So, in that circumstance, instead of exiting,
            # we die with no message. JSON::RPC checks raise_error before
            # it checks $@, so it returns the proper error.
            die if _in_eval();
            $server->response($server->error_response_header);
        }
    }
    exit;
}

sub ThrowUserError {
    _throw_error("global/user-error.html.tmpl", @_);
}

sub ThrowCodeError {
    my (undef, $vars) = @_;

    # Don't show function arguments, in case they contain
    # confidential data.
    local $Carp::MaxArgNums = -1;
    # Don't show the error as coming from Bugzilla::Error, show it
    # as coming from the caller.
    local $Carp::CarpInternal{'Bugzilla::Error'} = 1;
    $vars->{traceback} = Carp::longmess();

    _throw_error("global/code-error.html.tmpl", @_);
}

sub ThrowTemplateError {
    my ($template_err) = @_;
    my $dbh = Bugzilla->dbh;

    # Make sure the transaction is rolled back (if supported).
    $dbh->bz_rollback_transaction() if $dbh->bz_in_transaction();

    my $vars = {};
    if (Bugzilla->error_mode == ERROR_MODE_DIE) {
        die("error: template error: $template_err");
    }

    $vars->{'template_error_msg'} = $template_err;
    $vars->{'error'} = "template_error";

    my $template = Bugzilla->template;

    # Try a template first; but if this one fails too, fall back
    # on plain old print statements.
    if (!$template->process("global/code-error.html.tmpl", $vars)) {
        require Bugzilla::Util;
        import Bugzilla::Util qw(html_quote);
        my $maintainer = Bugzilla->params->{'maintainer'};
        my $error = html_quote($vars->{'template_error_msg'});
        my $error2 = html_quote($template->error());
        print <<END;
        <tt>
          <p>
            Bugzilla has suffered an internal error. Please save this page and 
            send it to $maintainer with details of what you were doing at the 
            time this message appeared.
          </p>
          <script type="text/javascript"> <!--
          document.write("<p>URL: " + 
                          document.location.href.replace(/&/g,"&amp;")
                                                .replace(/</g,"&lt;")
                                                .replace(/>/g,"&gt;") + "</p>");
          // -->
          </script>
          <p>Template->process() failed twice.<br>
          First error: $error<br>
          Second error: $error2</p>
        </tt>
END
    }
    exit;
}

1;

__END__

=head1 NAME

Bugzilla::Error - Error handling utilities for Bugzilla

=head1 SYNOPSIS

  use Bugzilla::Error;

  ThrowUserError("error_tag",
                 { foo => 'bar' });

=head1 DESCRIPTION

Various places throughout the Bugzilla codebase need to report errors to the
user. The C<Throw*Error> family of functions allow this to be done in a
generic and localizable manner.

These functions automatically unlock the database tables, if there were any
locked. They will also roll back the transaction, if it is supported by
the underlying DB.

=head1 FUNCTIONS

=over 4

=item C<ThrowUserError>

This function takes an error tag as the first argument, and an optional hashref
of variables as a second argument. These are used by the
I<global/user-error.html.tmpl> template to format the error, using the passed
in variables as required.

=item C<ThrowCodeError>

This function is used when an internal check detects an error of some sort.
This usually indicates a bug in Bugzilla, although it can occur if the user
manually constructs urls without correct parameters.

This function's behaviour is similar to C<ThrowUserError>, except that the
template used to display errors is I<global/code-error.html.tmpl>. In addition
if the hashref used as the optional second argument contains a key I<variables>
then the contents of the hashref (which is expected to be another hashref) will
be displayed after the error message, as a debugging aid.

=item C<ThrowTemplateError>

This function should only be called if a C<template-<gt>process()> fails.
It tries another template first, because often one template being
broken or missing doesn't mean that they all are. But it falls back to
a print statement as a last-ditch error.

=back

=head1 SEE ALSO

L<Bugzilla|Bugzilla>