xfd: avoid client clock for RFD log page determination

The curtimestamp parameter is added to the API request while finding the target of the redirect, so that the server time is available while determining the log page.

modules/twinklexfd.js

@@ -1232,7 +1232,8 @@ Twinkle.xfd.callbacks = {
 				var query = {
 					'action': 'query',
 					'titles': mw.config.get('wgPageName'),
-					'redirects': true
+					'redirects': true,
+					'curtimestamp': true
 				};
 				var wikipedia_api = new Morebits.wiki.api('Finding target of redirect', query, Twinkle.xfd.callbacks.rfd.findTargetCallback(callback));
 				wikipedia_api.params = params;
@@ -1242,20 +1243,22 @@ Twinkle.xfd.callbacks = {
 		// This is a closure for the callback from the above API request, which gets the target of the redirect
 		findTargetCallback: function(callback) {
 			return function(apiobj) {
-				var xmlDoc = apiobj.responseXML;
-				var target = $(xmlDoc).find('redirects r').first().attr('to');
+				var $xmlDoc = $(apiobj.responseXML);
+				var curtimestamp = $xmlDoc.find('api').attr('curtimestamp');
+				var target = $xmlDoc.find('redirects r').first().attr('to');
 				if (!target) {
 					apiobj.statelem.error('This page is currently not a redirect, aborting');
 					return;
 				}
+				var section = $xmlDoc.find('redirects r').first().attr('tofragment');
+				apiobj.params.curtimestamp = curtimestamp;
 				apiobj.params.target = target;
-				var section = $(xmlDoc).find('redirects r').first().attr('tofragment');
 				apiobj.params.section = section;
 				callback(apiobj.params);
 			};
 		},
 		main: function(params) {
-			var date = new Date(); // XXX: avoid use of client clock
+			var date = new Date(params.curtimestamp);
 			params.logpage = 'Wikipedia:Redirects for discussion/Log/' + date.getUTCFullYear() + ' ' + date.getUTCMonthName() + ' ' + date.getUTCDate();
 			params.discussionpage = params.logpage + '#' + Morebits.pageNameNorm;