Issue 4864 - Start using ESLint for adblockpluschrome

chrome/ext/background.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 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";
 
+(function()
 {
   /* Pages */
 
   let Page = ext.Page = function(tab)
   {
     this.id = tab.id;
     this._url = tab.url && new URL(tab.url);
 
     this.browserAction = new BrowserAction(tab.id);
     this.contextMenus = new ContextMenus(this);
@@ skipping 20 matching lines @@
     sendMessage(message, responseCallback)
     {
       chrome.tabs.sendMessage(this.id, message, responseCallback);
     }
   };
 
   ext.getPage = id => new Page({id: parseInt(id, 10)});
 
   function afterTabLoaded(callback)
   {
-     return openedTab =>
-     {
-       let onUpdated = (tabId, changeInfo, tab) =>
-       {
-         if (tabId == openedTab.id && changeInfo.status == "complete")
-         {
-           chrome.tabs.onUpdated.removeListener(onUpdated);
-           callback(new Page(openedTab));
-         }
-       };
-       chrome.tabs.onUpdated.addListener(onUpdated);
-     };
+    return openedTab =>
+    {
+      let onUpdated = (tabId, changeInfo, tab) =>
+      {
+        if (tabId == openedTab.id && changeInfo.status == "complete")
+        {
+          chrome.tabs.onUpdated.removeListener(onUpdated);
+          callback(new Page(openedTab));
+        }
+      };
+      chrome.tabs.onUpdated.addListener(onUpdated);
+    };
   }
 
   ext.pages = {
     open(url, callback)
     {
-      chrome.tabs.create({url: url}, callback && afterTabLoaded(callback));
+      chrome.tabs.create({url}, callback && afterTabLoaded(callback));
     },
     query(info, callback)
     {
       let rawInfo = {};
       for (let property in info)
       {
         switch (property)
         {
           case "active":
           case "lastFocusedWindow":
@@ skipping 27 matching lines @@
     if (!frame)
       frame = frames[frameId] = {};
 
     return frame;
   }
 
   function updatePageFrameStructure(frameId, tabId, url, parentFrameId)
   {
     if (frameId == 0)
     {
-      let page = new Page({id: tabId, url: url});
+      let page = new Page({id: tabId, url});
 
       ext._removeFromAllPageMaps(tabId);
 
       chrome.tabs.get(tabId, () =>
       {
         // If the tab is prerendered, chrome.tabs.get() sets
         // chrome.runtime.lastError and we have to dispatch the onLoading event,
         // since the onUpdated event isn't dispatched for prerendered tabs.
         // However, we have to keep relying on the unUpdated event for tabs that
         // are already visible. Otherwise browser action changes get overridden
         // when Chrome automatically resets them on navigation.
         if (chrome.runtime.lastError)
           ext.pages.onLoading._dispatch(page);
       });
     }
 
     // Update frame parent and URL in frame structure
     let frame = createFrame(tabId, frameId);
     frame.url = new URL(url);
     frame.parent = framesOfTabs[tabId][parentFrameId] || null;
-  };
+  }
 
   chrome.webRequest.onHeadersReceived.addListener(details =>
   {
     // We have to update the frame structure when switching to a new
     // document, so that we process any further requests made by that
     // document in the right context. Unfortunately, we cannot rely
     // on webNavigation.onCommitted since it isn't guaranteed to fire
     // before any subresources start downloading[1]. As an
     // alternative we use webRequest.onHeadersReceived for HTTP(S)
     // URLs, being careful to ignore any responses that won't cause
@@ skipping 25 matching lines @@
       // "Content-Disposition" with a valid and non-empty value other
       // than "inline".
       // https://chromium.googlesource.com/chromium/src/+/02d3f50b/content/browser/loader/mime_sniffing_resource_handler.cc#534
       // https://chromium.googlesource.com/chromium/src/+/02d3f50b/net/http/http_content_disposition.cc#374
       // https://chromium.googlesource.com/chromium/src/+/16e2688e/net/http/http_util.cc#431
       if (headerName == "content-disposition")
       {
         let disposition = header.value.split(";")[0].replace(/[ \t]+$/, "");
         if (disposition.toLowerCase() != "inline" &&
             /^[\x21-\x7E]+$/.test(disposition) &&
-            !/[()<>@,;:\\"/\[\]?={}]/.test(disposition))
+            !/[()<>@,;:\\"/[\]?={}]/.test(disposition))
           return;
       }
 
       // The value of the "Content-Type" header also determines if Chrome will
       // initiate a download, or otherwise how the response will be rendered.
       // We only need to consider responses which will result in a navigation
       // and be rendered as HTML or similar.
       // Note: Chrome might render the response as HTML if the "Content-Type"
       // header is missing, invalid or unknown.
       // https://chromium.googlesource.com/chromium/src/+/99f41af9/net/http/http_util.cc#66
@@ skipping 92 matching lines @@
         chrome.browserAction.setBadgeBackgroundColor({
           tabId: this._tabId,
           color: this._changes.badgeColor
         });
       }
 
       this._changes = null;
     },
     _queueChanges()
     {
-      chrome.tabs.get(this._tabId, function()
+      chrome.tabs.get(this._tabId, () =>
       {
         // If the tab is prerendered, chrome.tabs.get() sets
         // chrome.runtime.lastError and we have to delay our changes
         // until the currently visible tab is replaced with the
         // prerendered tab. Otherwise chrome.browserAction.set* fails.
         if (chrome.runtime.lastError)
         {
           let onReplaced = (addedTabId, removedTabId) =>
           {
             if (addedTabId == this._tabId)
             {
               chrome.tabs.onReplaced.removeListener(onReplaced);
               this._applyChanges();
             }
           };
           chrome.tabs.onReplaced.addListener(onReplaced);
         }
         else
         {
           this._applyChanges();
         }
-      }.bind(this));
+      });
     },
     _addChange(name, value)
     {
       if (!this._changes)
       {
         this._changes = {};
         this._queueChanges();
       }
 
       this._changes[name] = value;
@@ skipping 101 matching lines @@
 
   /* Web requests */
 
   let framesOfTabs = Object.create(null);
 
   ext.getFrame = (tabId, frameId) =>
   {
     return (framesOfTabs[tabId] || {})[frameId];
   };
 
-  let handlerBehaviorChangedQuota = chrome.webRequest.MAX_HANDLER_BEHAVIOR_CHANGED_CALLS_PER_10_MINUTES;
+  let handlerBehaviorChangedQuota =
+    chrome.webRequest.MAX_HANDLER_BEHAVIOR_CHANGED_CALLS_PER_10_MINUTES;
 
   function propagateHandlerBehaviorChange()
   {
     // Make sure to not call handlerBehaviorChanged() more often than allowed
     // by chrome.webRequest.MAX_HANDLER_BEHAVIOR_CHANGED_CALLS_PER_10_MINUTES.
     // Otherwise Chrome notifies the user that this extension is causing issues.
     if (handlerBehaviorChangedQuota > 0)
     {
-      chrome.webNavigation.onBeforeNavigate.removeListener(propagateHandlerBehaviorChange);
+      chrome.webNavigation.onBeforeNavigate.removeListener(
+        propagateHandlerBehaviorChange
+      );
       chrome.webRequest.handlerBehaviorChanged();
 
       handlerBehaviorChangedQuota--;
       setTimeout(() => { handlerBehaviorChangedQuota++; }, 600000);
     }
   }
 
   ext.webRequest = {
     onBeforeRequest: new ext._EventTarget(),
     handlerBehaviorChanged()
     {
       // Defer handlerBehaviorChanged() until navigation occurs.
       // There wouldn't be any visible effect when calling it earlier,
       // but it's an expensive operation and that way we avoid to call
       // it multiple times, if multiple filters are added/removed.
-      let onBeforeNavigate = chrome.webNavigation.onBeforeNavigate;
+      let {onBeforeNavigate} = chrome.webNavigation;
       if (!onBeforeNavigate.hasListener(propagateHandlerBehaviorChange))
         onBeforeNavigate.addListener(propagateHandlerBehaviorChange);
     }
   };
 
   chrome.tabs.query({}, tabs =>
   {
     tabs.forEach(tab =>
     {
       chrome.webNavigation.getAllFrames({tabId: tab.id}, details =>
       {
         if (details && details.length > 0)
         {
           let frames = framesOfTabs[tab.id] = Object.create(null);
 
           for (let i = 0; i < details.length; i++)
-            frames[details[i].frameId] = {url: new URL(details[i].url), parent: null};
+          {
+            frames[details[i].frameId] = {
+              url: new URL(details[i].url),
+              parent: null
+            };
+          }
 
           for (let i = 0; i < details.length; i++)
           {
-            let parentFrameId = details[i].parentFrameId;
+            let {parentFrameId} = details[i];
 
             if (parentFrameId != -1)
               frames[details[i].frameId].parent = frames[parentFrameId];
           }
         }
       });
     });
   });
 
   chrome.webRequest.onBeforeRequest.addListener(details =>
   {
     // The high-level code isn't interested in requests that aren't
     // related to a tab or requests loading a top-level document,
     // those should never be blocked.
     if (details.tabId == -1 || details.type == "main_frame")
       return;
 
     // We are looking for the frame that contains the element which
     // has triggered this request. For most requests (e.g. images) we
     // can just use the request's frame ID, but for subdocument requests
     // (e.g. iframes) we must instead use the request's parent frame ID.
-    let frameId;
-    let requestType;
-    if (details.type == "sub_frame")
+    let {frameId, type} = details;
+    if (type == "sub_frame")
     {
       frameId = details.parentFrameId;
-      requestType = "SUBDOCUMENT";
-    }
-    else
-    {
-      frameId = details.frameId;
-      requestType = details.type.toUpperCase();
+      type = "SUBDOCUMENT";
     }
 
     let frame = ext.getFrame(details.tabId, frameId);
     if (frame)
     {
       let results = ext.webRequest.onBeforeRequest._dispatch(
         new URL(details.url),
-        requestType,
+        type.toUpperCase(),
         new Page({id: details.tabId}),
         frame
       );
 
       if (results.indexOf(false) != -1)
         return {cancel: true};
     }
   }, {urls: ["<all_urls>"]}, ["blocking"]);
 
 
@@ skipping 19 matching lines @@
 
           let frame = frames[rawSender.frameId];
           if (frame)
             return frame.parent;
 
           return frames[0];
         }
       };
     }
 
-    return ext.onMessage._dispatch(message, sender, sendResponse).indexOf(true) != -1;
+    return ext.onMessage._dispatch(
+      message, sender, sendResponse
+    ).indexOf(true) != -1;
   });
 
 
   /* Storage */
 
   ext.storage = {
     get(keys, callback)
     {
       chrome.storage.local.get(keys, callback);
     },
@@ skipping 82 matching lines @@
   /* Windows */
   ext.windows = {
     create(createData, callback)
     {
       chrome.windows.create(createData, createdWindow =>
       {
         afterTabLoaded(callback)(createdWindow.tabs[0]);
       });
     }
   };
-}
+}());