add feed editor button to reset pubsub subscription state

functions.js

@@ -1015,6 +1015,27 @@ function quickAddFilter() {
 	}
 }
 
+function resetPubSub(feed_id, title) {
+
+	var msg = __("Reset subscription? Tiny Tiny RSS will try to subscribe to the notification hub again on next feed update.").replace("%s", title);
+
+	if (title == undefined || confirm(msg)) {
+		notify_progress("Loading, please wait...");
+
+		var query = "?op=pref-feeds&quiet=1&subop=resetPubSub&ids=" + feed_id;
+
+		new Ajax.Request("backend.php", {
+			parameters: query,
+			onComplete: function(transport) {
+				dijit.byId("pubsubReset_Btn").attr('disabled', true);
+				notify_info("Subscription reset.");
+			} });
+	}
+
+	return false;
+}
+
+
 function unsubscribeFeed(feed_id, title) {
 
 	var msg = __("Unsubscribe from %s?").replace("%s", title);

modules/pref-feeds.php

@@ -505,9 +505,22 @@
 			print "<div class='dlgButtons'>
 				<div style=\"float : left\">
 				<button dojoType=\"dijit.form.Button\" onclick='return unsubscribeFeed($feed_id, \"$title\")'>".
-					__('Unsubscribe')."</button>
-				</div>
-				<button dojoType=\"dijit.form.Button\" onclick=\"return dijit.byId('feedEditDlg').execute()\">".__('Save')."</button>
+					__('Unsubscribe')."</button>";
+
+			$pubsub_state = db_fetch_result($result, 0, "pubsub_state");
+
+			$pubsub_btn_disabled = ($pubsub_state == 2) ? "" : "disabled=\"1\"";
+
+			print "<button dojoType=\"dijit.form.Button\" id=\"pubsubReset_Btn\" $pubsub_btn_disabled
+					onclick='return resetPubSub($feed_id, \"$title\")'>".__('Resubscribe to push updates').
+					"</button>";
+
+			print "</div>";
+
+			print "<div dojoType=\"dijit.Tooltip\" connectId=\"pubsubReset_Btn\" position=\"below\">".
+				__('Resets PubSubHubbub subscription status for push-enabled feeds.')."</div>";
+
+			print "<button dojoType=\"dijit.form.Button\" onclick=\"return dijit.byId('feedEditDlg').execute()\">".__('Save')."</button>
 				<button dojoType=\"dijit.form.Button\" onclick=\"return dijit.byId('feedEditDlg').hide()\">".__('Cancel')."</button>
 			</div>";
 
@@ -828,6 +841,16 @@
 			return;
 		}
 
+		if ($subop == "resetPubSub") {
+
+			$ids = db_escape_string($_REQUEST["ids"]);
+
+			db_query($link, "UPDATE ttrss_feeds SET pubsub_state = 0 WHERE id IN ($ids)
+				AND owner_uid = " . $_SESSION["uid"]);
+
+			return;
+		}
+
 		if ($subop == "remove") {
 
 			$ids = split(",", db_escape_string($_REQUEST["ids"]));