CGI.pm

# -*- 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>

use strict;

package Bugzilla::CGI;

use CGI qw(-no_xhtml -oldstyle_urls :private_tempfiles);

use base qw(CGI);

use Bugzilla::Util;

# We need to disable output buffering - see bug 179174
$| = 1;

# CGI.pm uses AUTOLOAD, but explicitly defines a DESTROY sub.
# We need to do so, too, otherwise perl dies when the object is destroyed
# and we don't have a DESTROY method (because CGI.pm's AUTOLOAD will |die|
# on getting an unknown sub to try to call)
sub DESTROY {};

sub new {
    my ($invocant, @args) = @_;
    my $class = ref($invocant) || $invocant;

    my $self = $class->SUPER::new(@args);

    # Check for errors
    # All of the Bugzilla code wants to do this, so do it here instead of
    # in each script

    my $err = $self->cgi_error;

    if ($err) {
        # XXX - under mod_perl we can use the request object to
        # enable the apache ErrorDocument stuff, which is localisable
        # (and localised by default under apache2).
        # This doesn't appear to be possible under mod_cgi.
        # Under mod_perl v2, though, this happens automatically, and the
        # message body is ignored.

        # Note that this error block is only triggered by CGI.pm for malformed
        # multipart requests, and so should never happen unless there is a
        # browser bug.

        # Using CGI.pm to do this means that ThrowCodeError prints the
        # content-type again...
        #print $self->header(-status => $err);
        print "Status: $err\n";

        my $vars = {};
        if ($err =~ m/(\d{3})\s(.*)/) {
            $vars->{http_error_code} = $1;
            $vars->{http_error_string} = $2;
        } else {
            $vars->{http_error_string} = $err;
        }

        &::ThrowCodeError("cgi_error", $vars);
    }

    return $self;
}

# We want this sorted plus the ability to exclude certain params
sub canonicalise_query {
    my ($self, @exclude) = @_;

    # Reconstruct the URL by concatenating the sorted param=value pairs
    my @parameters;
    foreach my $key (sort($self->param())) {
        # Leave this key out if it's in the exclude list
        next if lsearch(\@exclude, $key) != -1;

        my $esc_key = url_quote($key);

        foreach my $value ($self->param($key)) {
            if ($value) {
                my $esc_value = url_quote($value);

                push(@parameters, "$esc_key=$esc_value");
            }
        }
    }

    return join("&", @parameters);
}

1;

__END__

=head1 NAME

Bugzilla::CGI - CGI handling for Bugzilla

=head1 SYNOPSIS

  use Bugzilla::CGI;

  my $cgi = new Bugzilla::CGI();

=head1 DESCRIPTION

This package inherits from the standard CGI module, to provide additional
Bugzilla-specific functionality. In general, see L<the CGI.pm docs|CGI> for
documention.

=head1 CHANGES FROM L<CGI.PM|CGI>

Bugzilla::CGI has some differences from L<CGI.pm|CGI>.

=over 4

=item C<cgi_error> is automatically checked

After creating the CGI object, C<Bugzilla::CGI> automatically checks
I<cgi_error>, and throws a CodeError if a problem is detected.

=back

=head1 ADDITIONAL FUNCTIONS

I<Bugzilla::CGI> also includes additional functions.

=over 4

=item C<canonicalise_query(@exclude)>

This returns a sorted string of the parameters, suitable for use in a url.
Values in C<@exclude> are not included in the result.

=back