Bug 704999: Add support for GitHub for the 'See Also' field

Bugzilla/BugUrl.pm

@@ -57,6 +57,7 @@ use constant SUB_CLASSES => qw(
     Bugzilla::BugUrl::Trac
     Bugzilla::BugUrl::MantisBT
     Bugzilla::BugUrl::SourceForge
+    Bugzilla::BugUrl::GitHub
 );
 
 ###############################

Bugzilla/BugUrl/GitHub.pm

+# 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::BugUrl::GitHub;
+use strict;
+use base qw(Bugzilla::BugUrl);
+
+###############################
+####        Methods        ####
+###############################
+
+sub should_handle {
+    my ($class, $uri) = @_;
+
+    # GitHub issue URLs have only one form:
+    #  https://github.com/USER_OR_TEAM_OR_ORGANIZATION_NAME/REPOSITORY_NAME/issues/111
+    return ($uri->authority =~ /^github.com$/i
+            and $uri->path =~ m|^/[^/]+/[^/]+/issues/\d+$|) ? 1 : 0;
+}
+
+sub _check_value {
+    my ($class, $uri) = @_;
+
+    $uri = $class->SUPER::_check_value($uri);
+
+    # GitHub HTTP URLs redirect to HTTPS, so just use the HTTPS scheme.
+    $uri->scheme('https');
+
+    return $uri;
+}
+
+1;

template/en/default/global/user-error.html.tmpl

@@ -254,6 +254,7 @@
         <li>A ticket in a Trac installation.</li>
         <li>A b[% %]ug in a MantisBT installation.</li>
         <li>A b[% %]ug on sourceforge.net.</li>
+        <li>An issue on github.com.</li>
         [% Hook.process('bug_url_invalid_tracker') %]
       </ul>
     [% ELSIF reason == 'id' %]