From 400c51ccd9e98bf428a93a9677a162f947e03061 Mon Sep 17 00:00:00 2001
From: gorhill <rhill@raymondhill.net>
Date: Mon, 9 Mar 2015 13:07:08 -0400
Subject: [PATCH] handler for "abp:subscribe?" links

---
 src/js/subscriber.js | 127 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 src/js/subscriber.js

diff --git a/src/js/subscriber.js b/src/js/subscriber.js
new file mode 100644
index 000000000..ba97d7deb
--- /dev/null
+++ b/src/js/subscriber.js
@@ -0,0 +1,127 @@
+/*******************************************************************************
+
+    µBlock - a browser extension to block requests.
+    Copyright (C) 2015 Raymond Hill
+
+    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 3 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, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+/* global vAPI, HTMLDocument */
+
+/******************************************************************************/
+
+// Injected into specific web pages, those which have been pre-selected
+// because they are known to contains `abp:subscribe` links.
+
+/******************************************************************************/
+
+(function() {
+
+'use strict';
+
+/******************************************************************************/
+
+// https://github.com/gorhill/uBlock/issues/464
+if ( document instanceof HTMLDocument === false ) {
+    //console.debug('contentscript-start.js > not a HTLMDocument');
+    return false;
+}
+
+// Because in case
+if ( !vAPI ) {
+    //console.debug('contentscript-start.js > vAPI not found');
+    return;
+}
+
+/******************************************************************************/
+
+// Only if at least one relevant link exists on the page
+// The links look like this:
+//   abp:subscribe?location=https://easylist-downloads.adblockplus.org/easyprivacy.txt[...]
+
+if ( document.querySelector('[href^="abp:subscribe?"]') === null ) {
+    return;
+}
+
+/******************************************************************************/
+
+var messager = vAPI.messaging.channel('subscriber.js');
+
+/******************************************************************************/
+
+var onAbpLinkClicked = function(ev) {
+    var receiver = event.target;
+    if ( receiver === null ) {
+        return;
+    }
+    if ( receiver.tagName.toLowerCase() !== 'a' ) {
+        return;
+    }
+    var href = receiver.getAttribute('href') || '';
+    if ( href === '' ) {
+        return;
+    }
+    var matches = /^abp:subscribe\?location=([^&]+).*title=([^&]+)/.exec(href);
+    if ( matches === null ) {
+        return;
+    }
+    var location = decodeURIComponent(matches[1]);
+    var title = decodeURIComponent(matches[2]);
+
+    ev.stopPropagation();
+    ev.preventDefault();
+
+    var onExternalListsSaved = function() {
+        messager.send({
+            what: 'reloadAllFilters',
+            switches: [ { location: location, off: false } ],
+            update: false
+        });
+    };
+
+    var onSubscriberDataReady = function(details) {
+        var confirmStr = details.confirmStr
+                            .replace('{{url}}', location)
+                            .replace('{{title}}', title);
+        if ( !window.confirm(confirmStr) ) {
+            return;
+        }
+
+        // List already subscribed to?
+        var externalLists = details.externalLists.trim().split(/\s+/);
+        if ( externalLists.indexOf(location) !== -1 ) {
+            return;
+        }
+
+        externalLists.push(location);
+
+        messager.send({
+            what: 'userSettings',
+            name: 'externalLists',
+            value: externalLists.join('\n')
+        }, onExternalListsSaved);
+    };
+
+    messager.send({ what: 'subscriberData' }, onSubscriberDataReady);
+};
+
+document.addEventListener('click', onAbpLinkClicked, true);
+
+/******************************************************************************/
+
+})();
+
+/******************************************************************************/