subscriptionLink.postload.js

/*
 * This file is part of Adblock Plus <https://adblockplus.org/>,
 * Copyright (C) 2006-present eyeo GmbH
 *
 * Adblock Plus is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * Adblock Plus 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 Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 */

"use strict";

if (document instanceof HTMLDocument)
{
  document.addEventListener("click", event =>
  {
    // Ignore right-clicks
    if (event.button == 2)
      return;

    // Ignore simulated clicks.
    if (event.isTrusted == false)
      return;

    // Search the link associated with the click
    let link = event.target;
    while (!(link instanceof HTMLAnchorElement))
    {
      link = link.parentNode;

      if (!link)
        return;
    }

    let queryString = null;
    if (link.protocol == "http:" || link.protocol == "https:")
    {
      if (link.host == "subscribe.adblockplus.org" && link.pathname == "/")
        queryString = link.search.substr(1);
    }
    else
    {
      // Firefox 51 doesn't seem to populate the "search" property for
      // links with non-standard URL schemes so we need to extract the query
      // string manually.
      let match = /^abp:\/*subscribe\/*\?(.*)/i.exec(link.href);
      if (match)
        queryString = match[1];
    }

    if (!queryString)
      return;

    // This is our link - make sure the browser doesn't handle it
    event.preventDefault();
    event.stopPropagation();

    // Decode URL parameters
    let title = null;
    let url = null;
    for (let param of queryString.split("&"))
    {
      let parts = param.split("=", 2);
      if (parts.length != 2 || !/\S/.test(parts[1]))
        continue;
      switch (parts[0])
      {
        case "title":
          title = decodeURIComponent(parts[1]);
          break;
        case "location":
          url = decodeURIComponent(parts[1]);
          break;
      }
    }
    if (!url)
      return;

    // Default title to the URL
    if (!title)
      title = url;

    // Trim spaces in title and URL
    title = title.trim();
    url = url.trim();
    if (!/^(https?|ftp):/.test(url))
      return;

    browser.runtime.sendMessage({
      type: "subscriptions.add",
      title,
      url,
      confirm: true
    });
  }, true);
}