Issue 2040 - Replaced localStorage with chrome.storage.local

lib/filterComposer.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 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/>.
  */
 
-let {extractHostFromFrame, stringifyURL, isThirdParty} = require("url");
-let {getKey, isFrameWhitelisted} = require("whitelisting");
-let {defaultMatcher} = require("matcher");
-let {WhitelistFilter} = require("filterClasses");
+let {getDecodedHostname, stringifyURL} = require("url");
 
 function escapeChar(chr)
 {
   let code = chr.charCodeAt(0);
 
   // Control characters and leading digits must be escaped based on
   // their char code in CSS. Moreover, curly brackets aren't allowed
   // in elemhide filters, and therefore must be escaped based on their
   // char code as well.
   if (code <= 0x1F || code == 0x7F || /[\d\{\}]/.test(chr))
@@ skipping 21 matching lines @@
  * @return {string}
  */
 function quoteCSS(value)
 {
   return '"' + value.replace(/["\\\{\}\x00-\x1F\x7F]/g, escapeChar) + '"';
 }
 exports.quoteCSS = quoteCSS;
 
 /**
  * Generates filters to block an element.
- * @param {Object}   details
- * @param {string}   details.tagName  The element's tag name
- * @param {string}   detials.id       The element's "id" attribute
- * @param {string}   details.src      The element's "src" attribute
- * @param {string}   details.style    The element's "style" attribute
- * @param {string[]} details.classes  The classes given by the element's "class" attribute
- * @param {string[]} details.urls     The URLs considered when loading the element
- * @param {string}   details.type     The request type (will be ignored if there are no URLs)
- * @param {string}   details.baseURL  The URL of the document containing the element
- * @param {Page}     details.page     The page containing the element
- * @param {Frame}    details.frame    The frame containing the element
+ *
+ * @param {string}   tagName  The element's tag name
+ * @param {string}   [src]    The element's "src" attribute
+ * @param {string}   [id]     The element's "id" attribute
+ * @param {string}   [style]  The element's "style" attribute
+ * @param {string[]} classes  The classes given by the element's "class" attribute
+ * @param {string[]} urls     The URLs considered when loading the element
+ * @param {URL}      baseURL  The URL of the document containing the element
  *
  * @return {object} An object holding the list of generated filters and
  *                  the list of CSS selectors for the included element
  *                  hiding filters: {filters: [...], selectors: [...]}
  */
-function composeFilters(details)
+function composeFilters(tagName, id, src, style, classes, urls, baseURL)
 {
+  // Add a blocking filter for each HTTP(S) URL associated with the element
   let filters = [];
-  let selectors = [];
+  for (let url of urls)
+  {
+    let urlObj = new URL(url, baseURL);
+    if (urlObj.protocol == "http:" || urlObj.protocol == "https:")
+    {
+      let filter = stringifyURL(urlObj).replace(/^[\w\-]+:\/+(?:www\.)?/, "||");
 
-  let page = details.page;
-  let frame = details.frame;
-
-  if (!isFrameWhitelisted(page, frame, "DOCUMENT"))
-  {
-    let docDomain = extractHostFromFrame(frame);
-
-    // Add a blocking filter for each URL of the element that can be blocked
-    for (let url of details.urls)
-    {
-      let urlObj = new URL(url, details.baseURL);
-
-      if (urlObj.protocol == "http:" || urlObj.protocol == "https:")
-      {
-        url = stringifyURL(urlObj);
-
-        let filter = defaultMatcher.matchesAny(
-          url, details.type, docDomain,
-          isThirdParty(urlObj, docDomain),
-          getKey(page, frame)
-        );
-
-        if (!(filter instanceof WhitelistFilter))
-        {
-          let filterText = url.replace(/^[\w\-]+:\/+(?:www\.)?/, "||");
-
-          if (filters.indexOf(filterText) == -1)
-            filters.push(filterText);
-        }
-      }
-    }
-
-    // If we couldn't generate any blocking filters, fallback to element hiding
-    let selectors = [];
-    if (filters.length == 0 && !isFrameWhitelisted(page, frame, "ELEMHIDE"))
-    {
-      // Generate CSS selectors based on the element's "id" and "class" attribute
-      if (details.id)
-        selectors.push("#" + escapeCSS(details.id));
-      if (details.classes.length > 0)
-        selectors.push(details.classes.map(c => "." + escapeCSS(c)).join(""));
-
-      // If there is a "src" attribute, specifiying a URL that we can't block,
-      // generate a CSS selector matching the "src" attribute
-      if (details.src)
-        selectors.push(escapeCSS(details.tagName) + "[src=" + quoteCSS(details.src) + "]");
-
-      // As last resort, if there is a "style" attribute, and we couldn't generate
-      // any filters so far, generate a CSS selector matching the "style" attribute
-      if (details.style && selectors.length == 0 && filters.length == 0)
-        selectors.push(escapeCSS(details.tagName) + "[style=" + quoteCSS(details.style) + "]");
-
-      // Add an element hiding filter for each generated CSS selector
-      for (let selector of selectors)
-        filters.push(docDomain.replace(/^www\./, "") + "##" + selector);
+      if (filters.indexOf(filter) == -1)
+        filters.push(filter);
     }
   }
 
+  // If we couldn't generate any blocking filters, fallback to element hiding
+  let selectors = [];
+  if (filters.length == 0)
+  {
+    // Generate CSS selectors based on the element's "id" and "class" attribute
+    if (id)
+      selectors.push("#" + escapeCSS(id));
+    if (classes.length > 0)
+      selectors.push(classes.map(c => "." + escapeCSS(c)).join(""));
+
+    // If there is a "src" attribute, specifiying a URL that we can't block,
+    // generate a CSS selector matching the "src" attribute
+    if (src)
+      selectors.push(escapeCSS(tagName) + "[src=" + quoteCSS(src) + "]");
+
+    // As last resort, if there is a "style" attribute, and we couldn't generate
+    // any filters so far, generate a CSS selector matching the "style" attribute
+    if (style && selectors.length == 0 && filters.length == 0)
+      selectors.push(escapeCSS(tagName) + "[style=" + quoteCSS(style) + "]");
+
+    // Add an element hiding filter for each generated CSS selector
+    if (selectors.length > 0)
+    {
+      let domain = getDecodedHostname(baseURL).replace(/^www\./, "");
+
+      for (let selector of selectors)
+        filters.push(domain + "##" + selector);
+    }
+  }
+
   return {filters: filters, selectors: selectors};
 }
 exports.composeFilters = composeFilters;