Register as File browser handler in Chrome OS

extensions/chromium/extension-router.js

@@ -22,16 +22,33 @@ limitations under the License.
   var VIEWER_URL = chrome.extension.getURL('content/web/viewer.html');
   var CRX_BASE_URL = chrome.extension.getURL('/');
 
+  var schemes = [
+    'http',
+    'https',
+    'ftp',
+    'file',
+    'chrome-extension',
+    // Chromium OS
+    'filesystem',
+    // Chromium OS, shorthand for filesystem:<origin>/external/
+    'drive'
+  ];
+
   /**
    * @param {string} url The URL prefixed with chrome-extension://.../
    * @return {string|undefined} The percent-encoded URL of the (PDF) file.
    */
   function parseExtensionURL(url) {
     url = url.substring(CRX_BASE_URL.length);
-    var matchingUrl = /^(?:https?|file|ftp|chrome-extension)(:|%3A)/i.exec(url);
-    if (matchingUrl) {
+    // Find the (url-encoded) colon and verify that the scheme is whitelisted.
+    var schemeIndex = url.search(/:|%3A/i);
+    if (schemeIndex === -1) {
+      return;
+    }
+    var scheme = url.slice(0, schemeIndex).toLowerCase();
+    if (schemes.indexOf(scheme) >= 0) {
       url = url.split('#')[0];
-      if (matchingUrl[1] === ':') {
+      if (url.charAt(schemeIndex) === ':') {
         url = encodeURIComponent(url);
       }
       return url;
@@ -86,12 +103,10 @@ limitations under the License.
     }
   }, {
       types: ['main_frame', 'sub_frame'],
-      urls: [
-        CRX_BASE_URL + 'http*', // and https
-        CRX_BASE_URL + 'file*',
-        CRX_BASE_URL + 'ftp*',
-        CRX_BASE_URL + 'chrome-extension*'
-      ]
+      urls: schemes.map(function(scheme) {
+        // Format: "chrome-extension://[EXTENSIONID]/<scheme>*"
+        return CRX_BASE_URL + scheme + '*';
+      })
   }, ['blocking']);
 
   chrome.runtime.onMessage.addListener(function(message, sender) {
@@ -104,7 +119,7 @@ limitations under the License.
   // webRequest event listener is attached (= page not found).
   // Reload these tabs.
   chrome.tabs.query({
-    url: CRX_BASE_URL + '*://*'
+    url: CRX_BASE_URL + '*:*'
   }, function(tabsFromLastSession) {
     for (var i = 0; i < tabsFromLastSession.length; ++i) {
       chrome.tabs.reload(tabsFromLastSession[i].id);

extensions/chromium/manifest.json

@@ -9,6 +9,7 @@
     "16": "icon16.png"
   },
   "permissions": [
+    "fileBrowserHandler",
     "webRequest", "webRequestBlocking",
     "<all_urls>",
     "tabs",
@@ -25,6 +26,13 @@
     ],
     "js": ["nothing.js"]
   }],
+  "file_browser_handlers": [{
+    "id": "open-as-pdf",
+    "default_title": "Open with PDF Viewer",
+    "file_filters": [
+      "filesystem:*.pdf"
+    ]
+  }],
   "mime_types": [
     "application/pdf"
   ],
@@ -47,6 +55,8 @@
     "https:/*",
     "ftp:/*",
     "file:/*",
-    "chrome-extension:/*"
+    "chrome-extension:/*",
+    "filesystem:/*",
+    "drive:*"
   ]
 }

extensions/chromium/pdfHandler-vcros.js

@@ -0,0 +1,95 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
+/*
+Copyright 2014 Mozilla Foundation
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+/* globals chrome, getViewerURL */
+
+(function() {
+'use strict';
+
+if (!chrome.fileBrowserHandler) {
+  // Not on Chromium OS, bail out
+  return;
+}
+chrome.fileBrowserHandler.onExecute.addListener(onExecuteFileBrowserHandler);
+
+/**
+ * Invoked when "Open with PDF Viewer" is chosen in the File browser.
+ *
+ * @param {String} id      File browser action ID as specified in manifest.json
+ * @param {Object} details Object of type FileHandlerExecuteEventDetails
+ */
+function onExecuteFileBrowserHandler(id, details) {
+  if (id !== 'open-as-pdf') {
+    return;
+  }
+  var fileEntries = details.entries;
+  // "tab_id" is the currently documented format, but it is inconsistent with
+  // the other Chrome APIs that use "tabId" (http://crbug.com/179767)
+  var tabId = details.tab_id || details.tabId;
+  if (tabId > 0) {
+    chrome.tabs.get(tabId, function(tab) {
+      openViewer(tab && tab.windowId, fileEntries);
+    });
+  } else {
+    // Re-use existing window, if available.
+    chrome.windows.getLastFocused(function(chromeWindow) {
+      var windowId = chromeWindow && chromeWindow.id;
+      if (windowId) {
+        chrome.windows.update(windowId, { focused: true });
+      }
+      openViewer(windowId, fileEntries);
+    });
+  }
+}
+
+/**
+ * Open the PDF Viewer for the given list of PDF files.
+ *
+ * @param {number} windowId
+ * @param {Array} fileEntries List of Entry objects (HTML5 FileSystem API)
+ */
+function openViewer(windowId, fileEntries) {
+  if (!fileEntries.length) {
+    return;
+  }
+  var fileEntry = fileEntries.shift();
+  var url = fileEntry.toURL();
+  // Use drive: alias to get shorter (more human-readable) URLs.
+  url = url.replace(/^filesystem:chrome-extension:\/\/[a-p]{32}\/external\//,
+      'drive:');
+  url = getViewerURL(url);
+
+  if (windowId) {
+    chrome.tabs.create({
+      windowId: windowId,
+      active: true,
+      url: url
+    }, function() {
+      openViewer(windowId, fileEntries);
+    });
+  } else {
+    chrome.windows.create({
+      type: 'normal',
+      focused: true,
+      url: url
+    }, function(chromeWindow) {
+      openViewer(chromeWindow.id, fileEntries);
+    });
+  }
+}
+
+})();

extensions/chromium/pdfHandler.html

@@ -18,3 +18,4 @@ limitations under the License.
 <script src="pdfHandler.js"></script>
 <script src="extension-router.js"></script>
 <script src="pdfHandler-v2.js"></script>
+<script src="pdfHandler-vcros.js"></script>

web/viewer.js

@@ -1588,6 +1588,9 @@ document.addEventListener('DOMContentLoaded', function webViewerLoad(evt) {
 //#endif
 //#if CHROME
 //var file = DEFAULT_URL;
+//// XHR cannot get data from drive:-URLs, so expand to filesystem: (Chrome OS)
+//file = file.replace(/^drive:/i,
+//  'filesystem:' + location.origin + '/external/');
 //#endif
 
 //#if !(FIREFOX || MOZCENTRAL || CHROME || B2G)