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diff --git a/www/wiki/opensearch_desc.php b/www/wiki/opensearch_desc.php
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+<?php
+/**
+ * Generate an OpenSearch description file.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+// This endpoint is supposed to be independent of request cookies and other
+// details of the session. Log warnings for violations of the no-session
+// constraint.
+define( 'MW_NO_SESSION', 'warn' );
+
+require_once __DIR__ . '/includes/WebStart.php';
+
+if ( $wgRequest->getVal( 'ctype' ) == 'application/xml' ) {
+	// Makes testing tweaks about a billion times easier
+	$ctype = 'application/xml';
+} else {
+	$ctype = 'application/opensearchdescription+xml';
+}
+
+$response = $wgRequest->response();
+$response->header( "Content-type: $ctype" );
+
+// Set an Expires header so that squid can cache it for a short time
+// Short enough so that the sysadmin barely notices when $wgSitename is changed
+$expiryTime = 600; # 10 minutes
+$response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', time() + $expiryTime ) . ' GMT' );
+$response->header( 'Cache-control: max-age=600' );
+
+print '<?xml version="1.0"?>';
+print Xml::openElement( 'OpenSearchDescription',
+	[
+		'xmlns' => 'http://a9.com/-/spec/opensearch/1.1/',
+		'xmlns:moz' => 'http://www.mozilla.org/2006/browser/search/' ] );
+
+/* The spec says the ShortName must be no longer than 16 characters,
+ * but 16 is *realllly* short. In practice, browsers don't appear to care
+ * when we give them a longer string, so we're no longer attempting to trim.
+ *
+ * Note: ShortName and the <link title=""> need to match; they are used as
+ * a key for identifying if the search engine has been added already, *and*
+ * as the display name presented to the end-user.
+ *
+ * Behavior seems about the same between Firefox and IE 7/8 here.
+ * 'Description' doesn't appear to be used by either.
+ */
+$fullName = wfMessage( 'opensearch-desc' )->inContentLanguage()->text();
+print Xml::element( 'ShortName', null, $fullName );
+print Xml::element( 'Description', null, $fullName );
+
+// By default we'll use the site favicon.
+// Double-check if IE supports this properly?
+print Xml::element( 'Image',
+	[
+		'height' => 16,
+		'width' => 16,
+		'type' => 'image/x-icon' ],
+	wfExpandUrl( $wgFavicon, PROTO_CURRENT ) );
+
+$urls = [];
+
+// General search template. Given an input term, this should bring up
+// search results or a specific found page.
+// At least Firefox and IE 7 support this.
+$searchPage = SpecialPage::getTitleFor( 'Search' );
+$urls[] = [
+	'type' => 'text/html',
+	'method' => 'get',
+	'template' => $searchPage->getCanonicalURL( 'search={searchTerms}' ) ];
+
+foreach ( $wgOpenSearchTemplates as $type => $template ) {
+	if ( !$template && $wgEnableAPI ) {
+		$template = ApiOpenSearch::getOpenSearchTemplate( $type );
+	}
+
+	if ( $template ) {
+		$urls[] = [
+			'type' => $type,
+			'method' => 'get',
+			'template' => $template,
+		];
+	}
+}
+
+// Allow hooks to override the suggestion URL settings in a more
+// general way than overriding the whole search engine...
+Hooks::run( 'OpenSearchUrls', [ &$urls ] );
+
+foreach ( $urls as $attribs ) {
+	print Xml::element( 'Url', $attribs );
+}
+
+// And for good measure, add a link to the straight search form.
+// This is a custom format extension for Firefox, which otherwise
+// sends you to the domain root if you hit "enter" with an empty
+// search box.
+print Xml::element( 'moz:SearchForm', null,
+	$searchPage->getCanonicalURL() );
+
+print '</OpenSearchDescription>';