diff -r 000000000000 -r 6474c204b198 browser/extensions/pdfjs/content/PdfJs.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/extensions/pdfjs/content/PdfJs.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,289 @@
+/* Copyright 2012 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.
+ */
+
+var EXPORTED_SYMBOLS = ["PdfJs"];
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cr = Components.results;
+const Cm = Components.manager;
+const Cu = Components.utils;
+
+const PREF_PREFIX = 'pdfjs';
+const PREF_DISABLED = PREF_PREFIX + '.disabled';
+const PREF_MIGRATION_VERSION = PREF_PREFIX + '.migrationVersion';
+const PREF_PREVIOUS_ACTION = PREF_PREFIX + '.previousHandler.preferredAction';
+const PREF_PREVIOUS_ASK = PREF_PREFIX + '.previousHandler.alwaysAskBeforeHandling';
+const PREF_DISABLED_PLUGIN_TYPES = 'plugin.disable_full_page_plugin_for_types';
+const TOPIC_PDFJS_HANDLER_CHANGED = 'pdfjs:handlerChanged';
+const TOPIC_PLUGINS_LIST_UPDATED = "plugins-list-updated";
+const TOPIC_PLUGIN_INFO_UPDATED = "plugin-info-updated";
+const PDF_CONTENT_TYPE = 'application/pdf';
+
+Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+Cu.import('resource://gre/modules/Services.jsm');
+
+let Svc = {};
+XPCOMUtils.defineLazyServiceGetter(Svc, 'mime',
+                                   '@mozilla.org/mime;1',
+                                   'nsIMIMEService');
+XPCOMUtils.defineLazyServiceGetter(Svc, 'pluginHost',
+                                   '@mozilla.org/plugin/host;1',
+                                   'nsIPluginHost');
+
+function getBoolPref(aPref, aDefaultValue) {
+  try {
+    return Services.prefs.getBoolPref(aPref);
+  } catch (ex) {
+    return aDefaultValue;
+  }
+}
+
+function getIntPref(aPref, aDefaultValue) {
+  try {
+    return Services.prefs.getIntPref(aPref);
+  } catch (ex) {
+    return aDefaultValue;
+  }
+}
+
+function initializeDefaultPreferences() {
+
+var DEFAULT_PREFERENCES = {
+  showPreviousViewOnLoad: true,
+  defaultZoomValue: '',
+  ifAvailableShowOutlineOnLoad: false,
+  enableHandToolOnLoad: false,
+  enableWebGL: false
+};
+
+
+  var defaultBranch = Services.prefs.getDefaultBranch(PREF_PREFIX + '.');
+  var defaultValue;
+  for (var key in DEFAULT_PREFERENCES) {
+    defaultValue = DEFAULT_PREFERENCES[key];
+    switch (typeof defaultValue) {
+      case 'boolean':
+        defaultBranch.setBoolPref(key, defaultValue);
+        break;
+      case 'number':
+        defaultBranch.setIntPref(key, defaultValue);
+        break;
+      case 'string':
+        defaultBranch.setCharPref(key, defaultValue);
+        break;
+    }
+  }
+}
+
+// Register/unregister a constructor as a factory.
+function Factory() {}
+Factory.prototype = {
+  register: function register(targetConstructor) {
+    var proto = targetConstructor.prototype;
+    this._classID = proto.classID;
+
+    var factory = XPCOMUtils._getFactory(targetConstructor);
+    this._factory = factory;
+
+    var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+    registrar.registerFactory(proto.classID, proto.classDescription,
+                              proto.contractID, factory);
+  },
+
+  unregister: function unregister() {
+    var registrar = Cm.QueryInterface(Ci.nsIComponentRegistrar);
+    registrar.unregisterFactory(this._classID, this._factory);
+    this._factory = null;
+  }
+};
+
+let PdfJs = {
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
+  _registered: false,
+
+  init: function init() {
+    if (!getBoolPref(PREF_DISABLED, true)) {
+      this._migrate();
+    }
+
+    if (this.enabled)
+      this._ensureRegistered();
+    else
+      this._ensureUnregistered();
+
+    // Listen for when pdf.js is completely disabled or a different pdf handler
+    // is chosen.
+    Services.prefs.addObserver(PREF_DISABLED, this, false);
+    Services.prefs.addObserver(PREF_DISABLED_PLUGIN_TYPES, this, false);
+    Services.obs.addObserver(this, TOPIC_PDFJS_HANDLER_CHANGED, false);
+    Services.obs.addObserver(this, TOPIC_PLUGINS_LIST_UPDATED, false);
+    Services.obs.addObserver(this, TOPIC_PLUGIN_INFO_UPDATED, false);
+
+    initializeDefaultPreferences();
+  },
+
+  _migrate: function migrate() {
+    const VERSION = 2;
+    var currentVersion = getIntPref(PREF_MIGRATION_VERSION, 0);
+    if (currentVersion >= VERSION) {
+      return;
+    }
+    // Make pdf.js the default pdf viewer on the first migration.
+    if (currentVersion < 1) {
+      this._becomeHandler();
+    }
+    if (currentVersion < 2) {
+      // cleaning up of unused database preference (see #3994)
+      Services.prefs.clearUserPref(PREF_PREFIX + '.database');
+    }
+    Services.prefs.setIntPref(PREF_MIGRATION_VERSION, VERSION);
+  },
+
+  _becomeHandler: function _becomeHandler() {
+    let handlerInfo = Svc.mime.getFromTypeAndExtension(PDF_CONTENT_TYPE, 'pdf');
+    let prefs = Services.prefs;
+    if (handlerInfo.preferredAction !== Ci.nsIHandlerInfo.handleInternally &&
+        handlerInfo.preferredAction !== false) {
+      // Store the previous settings of preferredAction and
+      // alwaysAskBeforeHandling in case we need to revert them in a hotfix that
+      // would turn pdf.js off.
+      prefs.setIntPref(PREF_PREVIOUS_ACTION, handlerInfo.preferredAction);
+      prefs.setBoolPref(PREF_PREVIOUS_ASK, handlerInfo.alwaysAskBeforeHandling);
+    }
+
+    let handlerService = Cc['@mozilla.org/uriloader/handler-service;1'].
+                         getService(Ci.nsIHandlerService);
+
+    // Change and save mime handler settings.
+    handlerInfo.alwaysAskBeforeHandling = false;
+    handlerInfo.preferredAction = Ci.nsIHandlerInfo.handleInternally;
+    handlerService.store(handlerInfo);
+
+    // Also disable any plugins for pdfs.
+    var stringTypes = '';
+    var types = [];
+    if (prefs.prefHasUserValue(PREF_DISABLED_PLUGIN_TYPES)) {
+      stringTypes = prefs.getCharPref(PREF_DISABLED_PLUGIN_TYPES);
+    }
+    if (stringTypes !== '') {
+      types = stringTypes.split(',');
+    }
+
+    if (types.indexOf(PDF_CONTENT_TYPE) === -1) {
+      types.push(PDF_CONTENT_TYPE);
+    }
+    prefs.setCharPref(PREF_DISABLED_PLUGIN_TYPES, types.join(','));
+
+    // Update the category manager in case the plugins are already loaded.
+    let categoryManager = Cc["@mozilla.org/categorymanager;1"];
+    categoryManager.getService(Ci.nsICategoryManager).
+                    deleteCategoryEntry("Gecko-Content-Viewers",
+                                        PDF_CONTENT_TYPE,
+                                        false);
+  },
+
+  // nsIObserver
+  observe: function observe(aSubject, aTopic, aData) {
+    if (this.enabled)
+      this._ensureRegistered();
+    else
+      this._ensureUnregistered();
+  },
+  
+  /**
+   * pdf.js is only enabled if it is both selected as the pdf viewer and if the 
+   * global switch enabling it is true.
+   * @return {boolean} Wether or not it's enabled.
+   */
+  get enabled() {
+    var disabled = getBoolPref(PREF_DISABLED, true);
+    if (disabled) {
+      return false;
+    }
+
+    // the 'application/pdf' handler is selected as internal?
+    var handlerInfo = Svc.mime
+                         .getFromTypeAndExtension(PDF_CONTENT_TYPE, 'pdf');
+    if (handlerInfo.alwaysAskBeforeHandling ||
+        handlerInfo.preferredAction !== Ci.nsIHandlerInfo.handleInternally) {
+      return false;
+    }
+
+    // Check if we have disabled plugin handling of 'application/pdf' in prefs
+    if (Services.prefs.prefHasUserValue(PREF_DISABLED_PLUGIN_TYPES)) {
+      let disabledPluginTypes =
+        Services.prefs.getCharPref(PREF_DISABLED_PLUGIN_TYPES).split(',');
+      if (disabledPluginTypes.indexOf(PDF_CONTENT_TYPE) >= 0) {
+        return true;
+      }
+    }
+
+    // Check if there is an enabled pdf plugin.
+    // Note: this check is performed last because getPluginTags() triggers costly
+    // plugin list initialization (bug 881575)
+    let tags = Cc["@mozilla.org/plugin/host;1"].
+                  getService(Ci.nsIPluginHost).
+                  getPluginTags();
+    let enabledPluginFound = tags.some(function(tag) {
+      if (tag.disabled) {
+        return false;
+      }
+      let mimeTypes = tag.getMimeTypes();
+      return mimeTypes.some(function(mimeType) {
+        return mimeType === PDF_CONTENT_TYPE;
+      });
+    });
+
+    // Use pdf.js if pdf plugin is not present or disabled
+    return !enabledPluginFound;
+  },
+
+  _ensureRegistered: function _ensureRegistered() {
+    if (this._registered)
+      return;
+
+    this._pdfStreamConverterFactory = new Factory();
+    Cu.import('resource://pdf.js/PdfStreamConverter.jsm');
+    this._pdfStreamConverterFactory.register(PdfStreamConverter);
+
+    this._pdfRedirectorFactory = new Factory();
+    Cu.import('resource://pdf.js/PdfRedirector.jsm');
+    this._pdfRedirectorFactory.register(PdfRedirector);
+
+    Svc.pluginHost.registerPlayPreviewMimeType(PDF_CONTENT_TYPE, true,
+      'data:application/x-moz-playpreview-pdfjs;,');
+
+    this._registered = true;
+  },
+
+  _ensureUnregistered: function _ensureUnregistered() {
+    if (!this._registered)
+      return;
+
+    this._pdfStreamConverterFactory.unregister();
+    Cu.unload('resource://pdf.js/PdfStreamConverter.jsm');
+    delete this._pdfStreamConverterFactory;
+
+    this._pdfRedirectorFactory.unregister();
+    Cu.unload('resource://pdf.js/PdfRedirector.jsm');
+    delete this._pdfRedirectorFactory;
+
+    Svc.pluginHost.unregisterPlayPreviewMimeType(PDF_CONTENT_TYPE);
+
+    this._registered = false;
+  }
+};
+