Bug 396245: Allow the WebService to list the installed plugins and their versions

Bugzilla/Hook.pm

@@ -41,6 +41,8 @@ sub process {
         # If there's malicious data here, we have much bigger issues to 
         # worry about, so we can safely detaint them:
         trick_taint($extension);
+        # Skip CVS directories and any hidden files/dirs.
+        next if $extension =~ m{/CVS$} || $extension =~ m{/\.[^/]+$};
         next if -e "$extension/disabled";
         if (-e $extension.'/code/'.$name.'.pl') {
             Bugzilla->hook_args($args);
@@ -53,7 +55,28 @@ sub process {
             Bugzilla->hook_args({});
         }
     }
-    
+}
+
+sub enabled_plugins {
+    my $extdir = bz_locations()->{'extensionsdir'};
+    my @extensions = glob("$extdir/*");
+    my %enabled;
+    foreach my $extension (@extensions) {
+        trick_taint($extension);
+        my $extname = $extension;
+        $extname =~ s{^\Q$extdir\E/}{};
+        next if $extname eq 'CVS' || $extname =~ /^\./;
+        next if -e "$extension/disabled";
+        # Allow extensions to load their own libraries.
+        local @INC = ("$extension/lib", @INC);
+        $enabled{$extname} = do("$extension/version.pl");
+        ThrowCodeError('extension_invalid',
+                { errstr => $@, name => 'version',
+                  extension => $extension }) if $@;
+
+    }
+
+    return \%enabled;
 }
 
 1;
@@ -78,6 +101,10 @@ hooks. When a piece of standard Bugzilla code wants to allow an extension
 to perform additional functions, it uses Bugzilla::Hook's L</process>
 subroutine to invoke any extension code if installed. 
 
+There is a sample extension in F<extensions/example/> that demonstrates
+most of the things described in this document, as well as many of the
+hooks available.
+
 =head2 How Hooks Work
 
 When a hook named C<HOOK_NAME> is run, Bugzilla will attempt to invoke any 
@@ -96,6 +123,12 @@ These params are accessible through L<Bugzilla/hook_args>.
 That returns a hashref. Very frequently, if you want your
 hook to do anything, you have to modify these variables.
 
+=head2 Versioning Extensions
+
+Every extension must have a file in its root called F<version.pl>.
+This file should return a version number when called with C<do>.
+This represents the current version of this extension.
+
 =head1 SUBROUTINES
 
 =over

Bugzilla/WebService/Bugzilla.pm

@@ -21,6 +21,7 @@ package Bugzilla::WebService::Bugzilla;
 use strict;
 use base qw(Bugzilla::WebService);
 use Bugzilla::Constants;
+use Bugzilla::Hook;
 import SOAP::Data qw(type);
 
 use Time::Zone;
@@ -29,6 +30,14 @@ sub version {
     return { version => type('string')->value(BUGZILLA_VERSION) };
 }
 
+sub plugins {
+    my $plugins = Bugzilla::Hook::enabled_plugins();
+    foreach my $name (keys %$plugins) {
+        $plugins->{$name} = type('string')->value($plugins->{$name});
+    }
+    return { plugins => $plugins };
+}
+
 sub timezone {
     my $offset = tz_offset();
     $offset = (($offset / 60) / 60) * 100;
@@ -74,6 +83,25 @@ string.
 
 =back
 
+=item C<plugins> B<EXPERIMENTAL>
+
+=over
+
+=item B<Description>
+
+Gets information about the plugins that are currently installed and enabled
+in this Bugzilla.
+
+=item B<Params> (none)
+
+=item B<Returns>
+
+A hash with a single item, C<plugins>. This points to a hash. I<That> hash
+contains the names of plugins as keys, and the versions of the plugin as
+values.
+
+=back
+
 =item C<timezone> B<EXPERIMENTAL>
 
 =over

extensions/example/version.pl

+# -*- 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 Example WebService Plugin
+#
+# The Initial Developer of the Original Code is Everything Solved, Inc.
+# Portions created by Everything Solved, Inc. are Copyright (C) 2007
+# Everything Solved, Inc. All Rights Reserved.
+#
+# Contributor(s): Max Kanat-Alexander <mkanat@bugzilla.org>
+
+# This script does some code to return a version number. However,
+# most plugins will probably just want to return a raw string.
+# To do that, the only contents of the file should be the string
+# on a single line, like:
+#
+# '1.2.3';
+
+use strict;
+no warnings qw(void); # Avoid "useless use of a constant in void context"
+use Bugzilla::Constants;
+BUGZILLA_VERSION;