Issue 5083 - Merges chrome subdirectory to top level directory

ext/background.js

Index: ext/background.js
===================================================================
--- a/ext/background.js
+++ b/ext/background.js
@@ -63,9 +63,671 @@
     }
   };
 
   ext._removeFromAllPageMaps = pageId =>
   {
     for (let pageMapId in nonEmptyPageMaps)
       nonEmptyPageMaps[pageMapId]._delete(pageId);
   };
+
+  /* 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);
+  };
+  Page.prototype = {
+    get url()
+    {
+      // usually our Page objects are created from Chrome's Tab objects, which
+      // provide the url. So we can return the url given in the constructor.
+      if (this._url)
+        return this._url;
+
+      // but sometimes we only have the tab id when we create a Page object.
+      // In that case we get the url from top frame of the tab, recorded by
+      // the onBeforeRequest handler.
+      let frames = framesOfTabs[this.id];
+      if (frames)
+      {
+        let frame = frames[0];
+        if (frame)
+          return frame.url;
+      }
+    },
+    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);
+    };
+  }
+
+  ext.pages = {
+    open(url, callback)
+    {
+      chrome.tabs.create({url}, callback && afterTabLoaded(callback));
+    },
+    query(info, callback)
+    {
+      let rawInfo = {};
+      for (let property in info)
+      {
+        switch (property)
+        {
+          case "active":
+          case "lastFocusedWindow":
+            rawInfo[property] = info[property];
+        }
+      }
+
+      chrome.tabs.query(rawInfo, tabs =>
+      {
+        callback(tabs.map(tab => new Page(tab)));
+      });
+    },
+    onLoading: new ext._EventTarget(),
+    onActivated: new ext._EventTarget(),
+    onRemoved: new ext._EventTarget()
+  };
+
+  chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) =>
+  {
+    if (changeInfo.status == "loading")
+      ext.pages.onLoading._dispatch(new Page(tab));
+  });
+
+  function createFrame(tabId, frameId)
+  {
+    let frames = framesOfTabs[tabId];
+    if (!frames)
+      frames = framesOfTabs[tabId] = Object.create(null);
+
+    let frame = frames[frameId];
+    if (!frame)
+      frame = frames[frameId] = {};
+
+    return frame;
+  }
+
+  function updatePageFrameStructure(frameId, tabId, url, parentFrameId)
+  {
+    if (frameId == 0)
+    {
+      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
+    // the document to be replaced.
+    // [1] - https://bugs.chromium.org/p/chromium/issues/detail?id=665843
+
+    // The request has been processed without replacing the document.
+    // https://chromium.googlesource.com/chromium/src/+/02d3f50b/content/browser/frame_host/navigation_request.cc#473
+    if (details.statusCode == 204 || details.statusCode == 205)
+      return;
+
+    for (let header of details.responseHeaders)
+    {
+      let headerName = header.name.toLowerCase();
+
+      // For redirects we must wait for the next response in order
+      // to know if the document will be replaced. Note: Chrome
+      // performs a redirect only if there is a "Location" header with
+      // a non-empty value and a known redirect status code.
+      // https://chromium.googlesource.com/chromium/src/+/39a7d96/net/http/http_response_headers.cc#929
+      if (headerName == "location" && header.value &&
+          (details.statusCode == 301 || details.statusCode == 302 ||
+           details.statusCode == 303 || details.statusCode == 307 ||
+           details.statusCode == 308))
+        return;
+
+      // If the response initiates a download the document won't be
+      // replaced. Chrome initiates a download if there is a
+      // "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))
+          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
+      // https://chromium.googlesource.com/chromium/src/+/3130418a/net/base/mime_sniffer.cc#667
+      if (headerName == "content-type")
+      {
+        let mediaType = header.value.split(/[ \t;(]/)[0].toLowerCase();
+        if (mediaType.includes("/") &&
+            mediaType != "*/*" &&
+            mediaType != "application/unknown" &&
+            mediaType != "unknown/unknown" &&
+            mediaType != "text/html" &&
+            mediaType != "text/xml" &&
+            mediaType != "application/xml" &&
+            mediaType != "application/xhtml+xml" &&
+            mediaType != "image/svg+xml")
+          return;
+      }
+    }
+
+    updatePageFrameStructure(details.frameId, details.tabId, details.url,
+                             details.parentFrameId);
+  },
+  {types: ["main_frame", "sub_frame"], urls: ["http://*/*", "https://*/*"]},
+  ["responseHeaders"]);
+
+  chrome.webNavigation.onBeforeNavigate.addListener(details =>
+  {
+    // Since we can only listen for HTTP(S) responses using
+    // webRequest.onHeadersReceived we must update the page structure here for
+    // other navigations.
+    let url = new URL(details.url);
+    if (url.protocol != "http:" && url.protocol != "https:")
+    {
+      updatePageFrameStructure(details.frameId, details.tabId, details.url,
+                               details.parentFrameId);
+    }
+  });
+
+  function forgetTab(tabId)
+  {
+    ext.pages.onRemoved._dispatch(tabId);
+
+    ext._removeFromAllPageMaps(tabId);
+    delete framesOfTabs[tabId];
+  }
+
+  chrome.tabs.onReplaced.addListener((addedTabId, removedTabId) =>
+  {
+    forgetTab(removedTabId);
+  });
+
+  chrome.tabs.onRemoved.addListener(forgetTab);
+
+  chrome.tabs.onActivated.addListener(details =>
+  {
+    ext.pages.onActivated._dispatch(new Page({id: details.tabId}));
+  });
+
+
+  /* Browser actions */
+
+  let BrowserAction = function(tabId)
+  {
+    this._tabId = tabId;
+    this._changes = null;
+  };
+  BrowserAction.prototype = {
+    _applyChanges()
+    {
+      if ("iconPath" in this._changes)
+      {
+        chrome.browserAction.setIcon({
+          tabId: this._tabId,
+          path: {
+            16: this._changes.iconPath.replace("$size", "16"),
+            19: this._changes.iconPath.replace("$size", "19"),
+            20: this._changes.iconPath.replace("$size", "20"),
+            32: this._changes.iconPath.replace("$size", "32"),
+            38: this._changes.iconPath.replace("$size", "38"),
+            40: this._changes.iconPath.replace("$size", "40")
+          }
+        });
+      }
+
+      if ("badgeText" in this._changes)
+      {
+        chrome.browserAction.setBadgeText({
+          tabId: this._tabId,
+          text: this._changes.badgeText
+        });
+      }
+
+      if ("badgeColor" in this._changes)
+      {
+        chrome.browserAction.setBadgeBackgroundColor({
+          tabId: this._tabId,
+          color: this._changes.badgeColor
+        });
+      }
+
+      this._changes = null;
+    },
+    _queueChanges()
+    {
+      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();
+        }
+      });
+    },
+    _addChange(name, value)
+    {
+      if (!this._changes)
+      {
+        this._changes = {};
+        this._queueChanges();
+      }
+
+      this._changes[name] = value;
+    },
+    setIcon(path)
+    {
+      this._addChange("iconPath", path);
+    },
+    setBadge(badge)
+    {
+      if (!badge)
+      {
+        this._addChange("badgeText", "");
+      }
+      else
+      {
+        if ("number" in badge)
+          this._addChange("badgeText", badge.number.toString());
+
+        if ("color" in badge)
+          this._addChange("badgeColor", badge.color);
+      }
+    }
+  };
+
+
+  /* Context menus */
+
+  let contextMenuItems = new ext.PageMap();
+  let contextMenuUpdating = false;
+
+  let updateContextMenu = () =>
+  {
+    if (contextMenuUpdating)
+      return;
+
+    contextMenuUpdating = true;
+
+    chrome.tabs.query({active: true, lastFocusedWindow: true}, tabs =>
+    {
+      chrome.contextMenus.removeAll(() =>
+      {
+        contextMenuUpdating = false;
+
+        if (tabs.length == 0)
+          return;
+
+        let items = contextMenuItems.get({id: tabs[0].id});
+
+        if (!items)
+          return;
+
+        items.forEach(item =>
+        {
+          chrome.contextMenus.create({
+            title: item.title,
+            contexts: item.contexts,
+            onclick(info, tab)
+            {
+              item.onclick(new Page(tab));
+            }
+          });
+        });
+      });
+    });
+  };
+
+  let ContextMenus = function(page)
+  {
+    this._page = page;
+  };
+  ContextMenus.prototype = {
+    create(item)
+    {
+      let items = contextMenuItems.get(this._page);
+      if (!items)
+        contextMenuItems.set(this._page, items = []);
+
+      items.push(item);
+      updateContextMenu();
+    },
+    remove(item)
+    {
+      let items = contextMenuItems.get(this._page);
+      if (items)
+      {
+        let index = items.indexOf(item);
+        if (index != -1)
+        {
+          items.splice(index, 1);
+          updateContextMenu();
+        }
+      }
+    }
+  };
+
+  chrome.tabs.onActivated.addListener(updateContextMenu);
+
+  chrome.windows.onFocusChanged.addListener(windowId =>
+  {
+    if (windowId != chrome.windows.WINDOW_ID_NONE)
+      updateContextMenu();
+  });
+
+
+  /* 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;
+
+  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.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;
+      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
+            };
+          }
+
+          for (let i = 0; i < details.length; i++)
+          {
+            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, type} = details;
+    if (type == "sub_frame")
+    {
+      frameId = details.parentFrameId;
+      type = "SUBDOCUMENT";
+    }
+
+    let frame = ext.getFrame(details.tabId, frameId);
+    if (frame)
+    {
+      let results = ext.webRequest.onBeforeRequest._dispatch(
+        new URL(details.url),
+        type.toUpperCase(),
+        new Page({id: details.tabId}),
+        frame
+      );
+
+      if (results.indexOf(false) != -1)
+        return {cancel: true};
+    }
+  }, {urls: ["<all_urls>"]}, ["blocking"]);
+
+
+  /* Message passing */
+
+  chrome.runtime.onMessage.addListener((message, rawSender, sendResponse) =>
+  {
+    let sender = {};
+
+    // Add "page" and "frame" if the message was sent by a content script.
+    // If sent by popup or the background page itself, there is no "tab".
+    if ("tab" in rawSender)
+    {
+      sender.page = new Page(rawSender.tab);
+      sender.frame = {
+        url: new URL(rawSender.url),
+        get parent()
+        {
+          let frames = framesOfTabs[rawSender.tab.id];
+
+          if (!frames)
+            return null;
+
+          let frame = frames[rawSender.frameId];
+          if (frame)
+            return frame.parent;
+
+          return frames[0];
+        }
+      };
+    }
+
+    return ext.onMessage._dispatch(
+      message, sender, sendResponse
+    ).indexOf(true) != -1;
+  });
+
+
+  /* Storage */
+
+  ext.storage = {
+    get(keys, callback)
+    {
+      chrome.storage.local.get(keys, callback);
+    },
+    set(key, value, callback)
+    {
+      let items = {};
+      items[key] = value;
+      chrome.storage.local.set(items, callback);
+    },
+    remove(key, callback)
+    {
+      chrome.storage.local.remove(key, callback);
+    },
+    onChanged: chrome.storage.onChanged
+  };
+
+  /* Options */
+
+  if ("openOptionsPage" in chrome.runtime)
+  {
+    ext.showOptions = callback =>
+    {
+      if (!callback)
+      {
+        chrome.runtime.openOptionsPage();
+      }
+      else
+      {
+        chrome.runtime.openOptionsPage(() =>
+        {
+          if (chrome.runtime.lastError)
+            return;
+
+          chrome.tabs.query({active: true, lastFocusedWindow: true}, tabs =>
+          {
+            if (tabs.length > 0)
+            {
+              if (tabs[0].status == "complete")
+                callback(new Page(tabs[0]));
+              else
+                afterTabLoaded(callback)(tabs[0]);
+            }
+          });
+        });
+      }
+    };
+  }
+  else
+  {
+    // Edge does not yet support runtime.openOptionsPage (tested version 38)
+    // and so this workaround needs to stay for now.
+    ext.showOptions = callback =>
+    {
+      chrome.windows.getLastFocused(win =>
+      {
+        let optionsUrl = chrome.extension.getURL("options.html");
+        let queryInfo = {url: optionsUrl};
+
+        // extension pages can't be accessed in incognito windows. In order to
+        // correctly mimic the way in which Chrome opens extension options,
+        // we have to focus the options page in any other window.
+        if (!win.incognito)
+          queryInfo.windowId = win.id;
+
+        chrome.tabs.query(queryInfo, tabs =>
+        {
+          if (tabs.length > 0)
+          {
+            let tab = tabs[0];
+
+            chrome.windows.update(tab.windowId, {focused: true});
+            chrome.tabs.update(tab.id, {active: true});
+
+            if (callback)
+              callback(new Page(tab));
+          }
+          else
+          {
+            ext.pages.open(optionsUrl, callback);
+          }
+        });
+      });
+    };
+  }
+
+  /* Windows */
+  ext.windows = {
+    create(createData, callback)
+    {
+      chrome.windows.create(createData, createdWindow =>
+      {
+        afterTabLoaded(callback)(createdWindow.tabs[0]);
+      });
+    }
+  };
 }());