Replace application/basilisk with browser/

browser/extensions/pdfjs/content/PdfStreamConverter.jsm

@@ -0,0 +1,969 @@
+/* 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.
+ */
+/* globals Components, Services, XPCOMUtils, NetUtil, PrivateBrowsingUtils,
+           dump, NetworkManager, PdfjsContentUtils */
+
+"use strict";
+
+var EXPORTED_SYMBOLS = ["PdfStreamConverter"];
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+const PDFJS_EVENT_ID = "pdf.js.message";
+const PDF_CONTENT_TYPE = "application/pdf";
+const PREF_PREFIX = "pdfjs";
+const PDF_VIEWER_WEB_PAGE = "resource://pdf.js/web/viewer.html";
+const MAX_NUMBER_OF_PREFS = 50;
+const MAX_STRING_PREF_LENGTH = 128;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/NetUtil.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "NetworkManager",
+  "resource://pdf.js/PdfJsNetwork.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
+  "resource://gre/modules/PrivateBrowsingUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "PdfjsContentUtils",
+  "resource://pdf.js/PdfjsContentUtils.jsm");
+
+var Svc = {};
+XPCOMUtils.defineLazyServiceGetter(Svc, "mime",
+                                   "@mozilla.org/mime;1",
+                                   "nsIMIMEService");
+
+function getContainingBrowser(domWindow) {
+  return domWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                  .getInterface(Ci.nsIWebNavigation)
+                  .QueryInterface(Ci.nsIDocShell)
+                  .chromeEventHandler;
+}
+
+function getFindBar(domWindow) {
+  if (PdfjsContentUtils.isRemote) {
+    throw new Error("FindBar is not accessible from the content process.");
+  }
+  try {
+    var browser = getContainingBrowser(domWindow);
+    var tabbrowser = browser.getTabBrowser();
+    var tab = tabbrowser.getTabForBrowser(browser);
+    return tabbrowser.getFindBar(tab);
+  } catch (e) {
+    // Suppress errors for PDF files opened in the bookmark sidebar, see
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=1248959.
+    return null;
+  }
+}
+
+function getBoolPref(pref, def) {
+  try {
+    return Services.prefs.getBoolPref(pref);
+  } catch (ex) {
+    return def;
+  }
+}
+
+function getIntPref(pref, def) {
+  try {
+    return Services.prefs.getIntPref(pref);
+  } catch (ex) {
+    return def;
+  }
+}
+
+function getStringPref(pref, def) {
+  try {
+    return Services.prefs.getComplexValue(pref, Ci.nsISupportsString).data;
+  } catch (ex) {
+    return def;
+  }
+}
+
+function log(aMsg) {
+  if (!getBoolPref(PREF_PREFIX + ".pdfBugEnabled", false)) {
+    return;
+  }
+  var msg = "PdfStreamConverter.js: " + (aMsg.join ? aMsg.join("") : aMsg);
+  Services.console.logStringMessage(msg);
+  dump(msg + "\n");
+}
+
+function getDOMWindow(aChannel) {
+  var requestor = aChannel.notificationCallbacks ?
+                  aChannel.notificationCallbacks :
+                  aChannel.loadGroup.notificationCallbacks;
+  var win = requestor.getInterface(Components.interfaces.nsIDOMWindow);
+  return win;
+}
+
+function getLocalizedStrings(path) {
+  var stringBundle = Cc["@mozilla.org/intl/stringbundle;1"].
+      getService(Ci.nsIStringBundleService).
+      createBundle("chrome://pdf.js/locale/" + path);
+
+  var map = {};
+  var enumerator = stringBundle.getSimpleEnumeration();
+  while (enumerator.hasMoreElements()) {
+    var string = enumerator.getNext().QueryInterface(Ci.nsIPropertyElement);
+    var key = string.key, property = "textContent";
+    var i = key.lastIndexOf(".");
+    if (i >= 0) {
+      property = key.substring(i + 1);
+      key = key.substring(0, i);
+    }
+    if (!(key in map)) {
+      map[key] = {};
+    }
+    map[key][property] = string.value;
+  }
+  return map;
+}
+function getLocalizedString(strings, id, property) {
+  property = property || "textContent";
+  if (id in strings) {
+    return strings[id][property];
+  }
+  return id;
+}
+
+// PDF data storage
+function PdfDataListener(length) {
+  this.length = length; // less than 0, if length is unknown
+  this.buffer = null;
+  this.loaded = 0;
+}
+
+PdfDataListener.prototype = {
+  append: function PdfDataListener_append(chunk) {
+    // In most of the cases we will pass data as we receive it, but at the
+    // beginning of the loading we may accumulate some data.
+    if (!this.buffer) {
+      this.buffer = new Uint8Array(chunk);
+    } else {
+      var buffer = this.buffer;
+      var newBuffer = new Uint8Array(buffer.length + chunk.length);
+      newBuffer.set(buffer);
+      newBuffer.set(chunk, buffer.length);
+      this.buffer = newBuffer;
+    }
+    this.loaded += chunk.length;
+    if (this.length >= 0 && this.length < this.loaded) {
+      this.length = -1; // reset the length, server is giving incorrect one
+    }
+    this.onprogress(this.loaded, this.length >= 0 ? this.length : void 0);
+  },
+  readData: function PdfDataListener_readData() {
+    var result = this.buffer;
+    this.buffer = null;
+    return result;
+  },
+  finish: function PdfDataListener_finish() {
+    this.isDataReady = true;
+    if (this.oncompleteCallback) {
+      this.oncompleteCallback(this.readData());
+    }
+  },
+  error: function PdfDataListener_error(errorCode) {
+    this.errorCode = errorCode;
+    if (this.oncompleteCallback) {
+      this.oncompleteCallback(null, errorCode);
+    }
+  },
+  onprogress() {},
+  get oncomplete() {
+    return this.oncompleteCallback;
+  },
+  set oncomplete(value) {
+    this.oncompleteCallback = value;
+    if (this.isDataReady) {
+      value(this.readData());
+    }
+    if (this.errorCode) {
+      value(null, this.errorCode);
+    }
+  }
+};
+
+/**
+ * All the privileged actions.
+ */
+class ChromeActions {
+  constructor(domWindow, contentDispositionFilename) {
+    this.domWindow = domWindow;
+    this.contentDispositionFilename = contentDispositionFilename;
+  }
+
+  isInPrivateBrowsing() {
+    return PrivateBrowsingUtils.isContentWindowPrivate(this.domWindow);
+  }
+
+  download(data, sendResponse) {
+    var self = this;
+    var originalUrl = data.originalUrl;
+    var blobUrl = data.blobUrl || originalUrl;
+    // The data may not be downloaded so we need just retry getting the pdf with
+    // the original url.
+    var originalUri = NetUtil.newURI(originalUrl);
+    var filename = data.filename;
+    if (typeof filename !== "string" ||
+        (!/\.pdf$/i.test(filename) && !data.isAttachment)) {
+      filename = "document.pdf";
+    }
+    var blobUri = NetUtil.newURI(blobUrl);
+    var extHelperAppSvc =
+          Cc["@mozilla.org/uriloader/external-helper-app-service;1"].
+             getService(Ci.nsIExternalHelperAppService);
+
+    var docIsPrivate = this.isInPrivateBrowsing();
+    var netChannel = NetUtil.newChannel({
+      uri: blobUri,
+      loadUsingSystemPrincipal: true,
+    });
+    if ("nsIPrivateBrowsingChannel" in Ci &&
+        netChannel instanceof Ci.nsIPrivateBrowsingChannel) {
+      netChannel.setPrivate(docIsPrivate);
+    }
+    NetUtil.asyncFetch(netChannel, function(aInputStream, aResult) {
+      if (!Components.isSuccessCode(aResult)) {
+        if (sendResponse) {
+          sendResponse(true);
+        }
+        return;
+      }
+      // Create a nsIInputStreamChannel so we can set the url on the channel
+      // so the filename will be correct.
+      var channel = Cc["@mozilla.org/network/input-stream-channel;1"].
+                       createInstance(Ci.nsIInputStreamChannel);
+      channel.QueryInterface(Ci.nsIChannel);
+      try {
+        // contentDisposition/contentDispositionFilename is readonly before FF18
+        channel.contentDisposition = Ci.nsIChannel.DISPOSITION_ATTACHMENT;
+        if (self.contentDispositionFilename && !data.isAttachment) {
+          channel.contentDispositionFilename = self.contentDispositionFilename;
+        } else {
+          channel.contentDispositionFilename = filename;
+        }
+      } catch (e) {}
+      channel.setURI(originalUri);
+      channel.loadInfo = netChannel.loadInfo;
+      channel.contentStream = aInputStream;
+      if ("nsIPrivateBrowsingChannel" in Ci &&
+          channel instanceof Ci.nsIPrivateBrowsingChannel) {
+        channel.setPrivate(docIsPrivate);
+      }
+
+      var listener = {
+        extListener: null,
+        onStartRequest(aRequest, aContext) {
+          var loadContext = self.domWindow
+                                .QueryInterface(Ci.nsIInterfaceRequestor)
+                                .getInterface(Ci.nsIWebNavigation)
+                                .QueryInterface(Ci.nsILoadContext);
+          this.extListener = extHelperAppSvc.doContent(
+            (data.isAttachment ? "application/octet-stream" :
+                                 "application/pdf"),
+            aRequest, loadContext, false);
+          this.extListener.onStartRequest(aRequest, aContext);
+        },
+        onStopRequest(aRequest, aContext, aStatusCode) {
+          if (this.extListener) {
+            this.extListener.onStopRequest(aRequest, aContext, aStatusCode);
+          }
+          // Notify the content code we're done downloading.
+          if (sendResponse) {
+            sendResponse(false);
+          }
+        },
+        onDataAvailable(aRequest, aContext, aDataInputStream, aOffset, aCount) {
+          this.extListener.onDataAvailable(aRequest, aContext, aDataInputStream,
+                                           aOffset, aCount);
+        }
+      };
+
+      channel.asyncOpen2(listener);
+    });
+  }
+
+  getLocale() {
+    return getStringPref("general.useragent.locale", "en-US");
+  }
+
+  getStrings(data) {
+    try {
+      // Lazy initialization of localizedStrings
+      if (!("localizedStrings" in this)) {
+        this.localizedStrings = getLocalizedStrings("viewer.properties");
+      }
+      var result = this.localizedStrings[data];
+      return JSON.stringify(result || null);
+    } catch (e) {
+      log("Unable to retrieve localized strings: " + e);
+      return "null";
+    }
+  }
+
+  supportsIntegratedFind() {
+    // Integrated find is only supported when we're not in a frame
+    if (this.domWindow.frameElement !== null) {
+      return false;
+    }
+
+    // ... and we are in a child process
+    if (PdfjsContentUtils.isRemote) {
+      return true;
+    }
+
+    // ... or when the new find events code exists.
+    var findBar = getFindBar(this.domWindow);
+    return !!findBar && ("updateControlState" in findBar);
+  }
+
+  supportsDocumentFonts() {
+    var prefBrowser = getIntPref("browser.display.use_document_fonts", 1);
+    var prefGfx = getBoolPref("gfx.downloadable_fonts.enabled", true);
+    return (!!prefBrowser && prefGfx);
+  }
+
+  supportsDocumentColors() {
+    return getIntPref("browser.display.document_color_use", 0) !== 2;
+  }
+
+  supportedMouseWheelZoomModifierKeys() {
+    return {
+      ctrlKey: getIntPref("mousewheel.with_control.action", 3) === 3,
+      metaKey: getIntPref("mousewheel.with_meta.action", 1) === 3,
+    };
+  }
+
+  /**
+   * @param {Object} args - Object with `featureId` and `url` properties.
+   * @param {function} sendResponse - Callback function.
+   */
+  fallback(args, sendResponse) {
+    var featureId = args.featureId;
+
+    var domWindow = this.domWindow;
+    var strings = getLocalizedStrings("chrome.properties");
+    var message;
+    if (featureId === "forms") {
+      message = getLocalizedString(strings, "unsupported_feature_forms");
+    } else {
+      message = getLocalizedString(strings, "unsupported_feature");
+    }
+    PdfjsContentUtils.displayWarning(domWindow, message,
+      getLocalizedString(strings, "open_with_different_viewer"),
+      getLocalizedString(strings, "open_with_different_viewer", "accessKey"));
+
+    let winmm = domWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                         .getInterface(Ci.nsIDocShell)
+                         .QueryInterface(Ci.nsIInterfaceRequestor)
+                         .getInterface(Ci.nsIContentFrameMessageManager);
+
+    winmm.addMessageListener("PDFJS:Child:fallbackDownload",
+      function fallbackDownload(msg) {
+        let data = msg.data;
+        sendResponse(data.download);
+
+        winmm.removeMessageListener("PDFJS:Child:fallbackDownload",
+                                    fallbackDownload);
+      });
+  }
+
+  updateFindControlState(data) {
+    if (!this.supportsIntegratedFind()) {
+      return;
+    }
+    // Verify what we're sending to the findbar.
+    var result = data.result;
+    var findPrevious = data.findPrevious;
+    var findPreviousType = typeof findPrevious;
+    if ((typeof result !== "number" || result < 0 || result > 3) ||
+        (findPreviousType !== "undefined" && findPreviousType !== "boolean")) {
+      return;
+    }
+
+    var winmm = this.domWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                              .getInterface(Ci.nsIDocShell)
+                              .QueryInterface(Ci.nsIInterfaceRequestor)
+                              .getInterface(Ci.nsIContentFrameMessageManager);
+
+    winmm.sendAsyncMessage("PDFJS:Parent:updateControlState", data);
+  }
+
+  setPreferences(prefs, sendResponse) {
+    var defaultBranch = Services.prefs.getDefaultBranch(PREF_PREFIX + ".");
+    var numberOfPrefs = 0;
+    var prefValue, prefName;
+    for (var key in prefs) {
+      if (++numberOfPrefs > MAX_NUMBER_OF_PREFS) {
+        log("setPreferences - Exceeded the maximum number of preferences " +
+            "that is allowed to be set at once.");
+        break;
+      } else if (!defaultBranch.getPrefType(key)) {
+        continue;
+      }
+      prefValue = prefs[key];
+      prefName = (PREF_PREFIX + "." + key);
+      switch (typeof prefValue) {
+        case "boolean":
+          PdfjsContentUtils.setBoolPref(prefName, prefValue);
+          break;
+        case "number":
+          PdfjsContentUtils.setIntPref(prefName, prefValue);
+          break;
+        case "string":
+          if (prefValue.length > MAX_STRING_PREF_LENGTH) {
+            log("setPreferences - Exceeded the maximum allowed length " +
+                "for a string preference.");
+          } else {
+            PdfjsContentUtils.setStringPref(prefName, prefValue);
+          }
+          break;
+      }
+    }
+    if (sendResponse) {
+      sendResponse(true);
+    }
+  }
+
+  getPreferences(prefs, sendResponse) {
+    var defaultBranch = Services.prefs.getDefaultBranch(PREF_PREFIX + ".");
+    var currentPrefs = {}, numberOfPrefs = 0;
+    var prefValue, prefName;
+    for (var key in prefs) {
+      if (++numberOfPrefs > MAX_NUMBER_OF_PREFS) {
+        log("getPreferences - Exceeded the maximum number of preferences " +
+            "that is allowed to be fetched at once.");
+        break;
+      } else if (!defaultBranch.getPrefType(key)) {
+        continue;
+      }
+      prefValue = prefs[key];
+      prefName = (PREF_PREFIX + "." + key);
+      switch (typeof prefValue) {
+        case "boolean":
+          currentPrefs[key] = getBoolPref(prefName, prefValue);
+          break;
+        case "number":
+          currentPrefs[key] = getIntPref(prefName, prefValue);
+          break;
+        case "string":
+          currentPrefs[key] = getStringPref(prefName, prefValue);
+          break;
+      }
+    }
+    let result = JSON.stringify(currentPrefs);
+    if (sendResponse) {
+      sendResponse(result);
+    }
+    return result;
+  }
+}
+
+/**
+ * This is for range requests.
+ */
+class RangedChromeActions extends ChromeActions {
+  constructor(domWindow, contentDispositionFilename, originalRequest,
+              rangeEnabled, streamingEnabled, dataListener) {
+
+    super(domWindow, contentDispositionFilename);
+    this.dataListener = dataListener;
+    this.originalRequest = originalRequest;
+    this.rangeEnabled = rangeEnabled;
+    this.streamingEnabled = streamingEnabled;
+
+    this.pdfUrl = originalRequest.URI.spec;
+    this.contentLength = originalRequest.contentLength;
+
+    // Pass all the headers from the original request through
+    var httpHeaderVisitor = {
+      headers: {},
+      visitHeader(aHeader, aValue) {
+        if (aHeader === "Range") {
+          // When loading the PDF from cache, firefox seems to set the Range
+          // request header to fetch only the unfetched portions of the file
+          // (e.g. 'Range: bytes=1024-'). However, we want to set this header
+          // manually to fetch the PDF in chunks.
+          return;
+        }
+        this.headers[aHeader] = aValue;
+      }
+    };
+    if (originalRequest.visitRequestHeaders) {
+      originalRequest.visitRequestHeaders(httpHeaderVisitor);
+    }
+
+    var self = this;
+    var xhr_onreadystatechange = function xhr_onreadystatechange() {
+      if (this.readyState === 1) { // LOADING
+        var netChannel = this.channel;
+        if ("nsIPrivateBrowsingChannel" in Ci &&
+            netChannel instanceof Ci.nsIPrivateBrowsingChannel) {
+          var docIsPrivate = self.isInPrivateBrowsing();
+          netChannel.setPrivate(docIsPrivate);
+        }
+      }
+    };
+    var getXhr = function getXhr() {
+      const XMLHttpRequest = Components.Constructor(
+          "@mozilla.org/xmlextras/xmlhttprequest;1");
+      var xhr = new XMLHttpRequest();
+      xhr.addEventListener("readystatechange", xhr_onreadystatechange);
+      return xhr;
+    };
+
+    this.networkManager = new NetworkManager(this.pdfUrl, {
+      httpHeaders: httpHeaderVisitor.headers,
+      getXhr,
+    });
+
+    // If we are in range request mode, this means we manually issued xhr
+    // requests, which we need to abort when we leave the page
+    domWindow.addEventListener("unload", function unload(e) {
+      domWindow.removeEventListener(e.type, unload);
+      self.abortLoading();
+    });
+  }
+
+  initPassiveLoading() {
+    var data;
+    if (!this.streamingEnabled) {
+      this.originalRequest.cancel(Cr.NS_BINDING_ABORTED);
+      this.originalRequest = null;
+      data = this.dataListener.readData();
+      this.dataListener = null;
+    } else {
+      data = this.dataListener.readData();
+
+      this.dataListener.onprogress = (loaded, total) => {
+        this.domWindow.postMessage({
+          pdfjsLoadAction: "progressiveRead",
+          loaded,
+          total,
+          chunk: this.dataListener.readData(),
+        }, "*");
+      };
+      this.dataListener.oncomplete = () => {
+        this.dataListener = null;
+      };
+    }
+
+    this.domWindow.postMessage({
+      pdfjsLoadAction: "supportsRangedLoading",
+      rangeEnabled: this.rangeEnabled,
+      streamingEnabled: this.streamingEnabled,
+      pdfUrl: this.pdfUrl,
+      length: this.contentLength,
+      data,
+    }, "*");
+
+    return true;
+  }
+
+  requestDataRange(args) {
+    if (!this.rangeEnabled) {
+      return;
+    }
+
+    var begin = args.begin;
+    var end = args.end;
+    var domWindow = this.domWindow;
+    // TODO(mack): Support error handler. We're not currently not handling
+    // errors from chrome code for non-range requests, so this doesn't
+    // seem high-pri
+    this.networkManager.requestRange(begin, end, {
+      onDone: function RangedChromeActions_onDone(aArgs) {
+        domWindow.postMessage({
+          pdfjsLoadAction: "range",
+          begin: aArgs.begin,
+          chunk: aArgs.chunk,
+        }, "*");
+      },
+      onProgress: function RangedChromeActions_onProgress(evt) {
+        domWindow.postMessage({
+          pdfjsLoadAction: "rangeProgress",
+          loaded: evt.loaded,
+        }, "*");
+      }
+    });
+  }
+
+  abortLoading() {
+    this.networkManager.abortAllRequests();
+    if (this.originalRequest) {
+      this.originalRequest.cancel(Cr.NS_BINDING_ABORTED);
+      this.originalRequest = null;
+    }
+    this.dataListener = null;
+  }
+}
+
+/**
+ * This is for a single network stream.
+ */
+class StandardChromeActions extends ChromeActions {
+  constructor(domWindow, contentDispositionFilename, originalRequest,
+              dataListener) {
+    super(domWindow, contentDispositionFilename);
+    this.originalRequest = originalRequest;
+    this.dataListener = dataListener;
+  }
+
+  initPassiveLoading() {
+    if (!this.dataListener) {
+      return false;
+    }
+
+    this.dataListener.onprogress = (loaded, total) => {
+      this.domWindow.postMessage({
+        pdfjsLoadAction: "progress",
+        loaded,
+        total,
+      }, "*");
+    };
+
+    this.dataListener.oncomplete = (data, errorCode) => {
+      this.domWindow.postMessage({
+        pdfjsLoadAction: "complete",
+        data,
+        errorCode,
+      }, "*");
+
+      this.dataListener = null;
+      this.originalRequest = null;
+    };
+
+    return true;
+  }
+
+  abortLoading() {
+    if (this.originalRequest) {
+      this.originalRequest.cancel(Cr.NS_BINDING_ABORTED);
+      this.originalRequest = null;
+    }
+    this.dataListener = null;
+  }
+}
+
+/**
+ * Event listener to trigger chrome privileged code.
+ */
+class RequestListener {
+  constructor(actions) {
+    this.actions = actions;
+  }
+
+  // Receive an event and synchronously or asynchronously responds.
+  receive(event) {
+    var message = event.target;
+    var doc = message.ownerDocument;
+    var action = event.detail.action;
+    var data = event.detail.data;
+    var sync = event.detail.sync;
+    var actions = this.actions;
+    if (!(action in actions)) {
+      log("Unknown action: " + action);
+      return;
+    }
+    var response;
+    if (sync) {
+      response = actions[action].call(this.actions, data);
+      event.detail.response = Cu.cloneInto(response, doc.defaultView);
+    } else {
+      if (!event.detail.responseExpected) {
+        doc.documentElement.removeChild(message);
+        response = null;
+      } else {
+        response = function sendResponse(aResponse) {
+          try {
+            var listener = doc.createEvent("CustomEvent");
+            let detail = Cu.cloneInto({ response: aResponse }, doc.defaultView);
+            listener.initCustomEvent("pdf.js.response", true, false, detail);
+            return message.dispatchEvent(listener);
+          } catch (e) {
+            // doc is no longer accessible because the requestor is already
+            // gone. unloaded content cannot receive the response anyway.
+            return false;
+          }
+        };
+      }
+      actions[action].call(this.actions, data, response);
+    }
+  }
+}
+
+/**
+ * Forwards events from the eventElement to the contentWindow only if the
+ * content window matches the currently selected browser window.
+ */
+class FindEventManager {
+  constructor(contentWindow) {
+    this.contentWindow = contentWindow;
+    this.winmm = contentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                              .getInterface(Ci.nsIDocShell)
+                              .QueryInterface(Ci.nsIInterfaceRequestor)
+                              .getInterface(Ci.nsIContentFrameMessageManager);
+  }
+
+  bind() {
+    var unload = function(e) {
+      this.unbind();
+      this.contentWindow.removeEventListener(e.type, unload);
+    }.bind(this);
+    this.contentWindow.addEventListener("unload", unload);
+
+    // We cannot directly attach listeners to for the find events
+    // since the FindBar is in the parent process. Instead we're
+    // asking the PdfjsChromeUtils to do it for us and forward
+    // all the find events to us.
+    this.winmm.sendAsyncMessage("PDFJS:Parent:addEventListener");
+    this.winmm.addMessageListener("PDFJS:Child:handleEvent", this);
+  }
+
+  receiveMessage(msg) {
+    var detail = msg.data.detail;
+    var type = msg.data.type;
+    var contentWindow = this.contentWindow;
+
+    detail = Cu.cloneInto(detail, contentWindow);
+    var forward = contentWindow.document.createEvent("CustomEvent");
+    forward.initCustomEvent(type, true, true, detail);
+    contentWindow.dispatchEvent(forward);
+  }
+
+  unbind() {
+    this.winmm.sendAsyncMessage("PDFJS:Parent:removeEventListener");
+  }
+}
+
+function PdfStreamConverter() {
+}
+
+PdfStreamConverter.prototype = {
+
+  // properties required for XPCOM registration:
+  classID: Components.ID("{d0c5195d-e798-49d4-b1d3-9324328b2291}"),
+  classDescription: "pdf.js Component",
+  contractID: "@mozilla.org/streamconv;1?from=application/pdf&to=*/*",
+
+  classID2: Components.ID("{d0c5195d-e798-49d4-b1d3-9324328b2292}"),
+  contractID2: "@mozilla.org/streamconv;1?from=application/pdf&to=text/html",
+
+  QueryInterface: XPCOMUtils.generateQI([
+      Ci.nsISupports,
+      Ci.nsIStreamConverter,
+      Ci.nsIStreamListener,
+      Ci.nsIRequestObserver
+  ]),
+
+  /*
+   * This component works as such:
+   * 1. asyncConvertData stores the listener
+   * 2. onStartRequest creates a new channel, streams the viewer
+   * 3. If range requests are supported:
+   *      3.1. Leave the request open until the viewer is ready to switch to
+   *           range requests.
+   *
+   *    If range rquests are not supported:
+   *      3.1. Read the stream as it's loaded in onDataAvailable to send
+   *           to the viewer
+   *
+   * The convert function just returns the stream, it's just the synchronous
+   * version of asyncConvertData.
+   */
+
+  // nsIStreamConverter::convert
+  convert(aFromStream, aFromType, aToType, aCtxt) {
+    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+  },
+
+  // nsIStreamConverter::asyncConvertData
+  asyncConvertData(aFromType, aToType, aListener, aCtxt) {
+    // Store the listener passed to us
+    this.listener = aListener;
+  },
+
+  // nsIStreamListener::onDataAvailable
+  onDataAvailable(aRequest, aContext, aInputStream, aOffset, aCount) {
+    if (!this.dataListener) {
+      return;
+    }
+
+    var binaryStream = this.binaryStream;
+    binaryStream.setInputStream(aInputStream);
+    var chunk = binaryStream.readByteArray(aCount);
+    this.dataListener.append(chunk);
+  },
+
+  // nsIRequestObserver::onStartRequest
+  onStartRequest(aRequest, aContext) {
+    // Setup the request so we can use it below.
+    var isHttpRequest = false;
+    try {
+      aRequest.QueryInterface(Ci.nsIHttpChannel);
+      isHttpRequest = true;
+    } catch (e) {}
+
+    var rangeRequest = false;
+    var streamRequest = false;
+    if (isHttpRequest) {
+      var contentEncoding = "identity";
+      try {
+        contentEncoding = aRequest.getResponseHeader("Content-Encoding");
+      } catch (e) {}
+
+      var acceptRanges;
+      try {
+        acceptRanges = aRequest.getResponseHeader("Accept-Ranges");
+      } catch (e) {}
+
+      var hash = aRequest.URI.ref;
+      var isPDFBugEnabled = getBoolPref(PREF_PREFIX + ".pdfBugEnabled", false);
+      rangeRequest = contentEncoding === "identity" &&
+                     acceptRanges === "bytes" &&
+                     aRequest.contentLength >= 0 &&
+                     !getBoolPref(PREF_PREFIX + ".disableRange", false) &&
+                     (!isPDFBugEnabled ||
+                      hash.toLowerCase().indexOf("disablerange=true") < 0);
+      streamRequest = contentEncoding === "identity" &&
+                      aRequest.contentLength >= 0 &&
+                      !getBoolPref(PREF_PREFIX + ".disableStream", false) &&
+                      (!isPDFBugEnabled ||
+                       hash.toLowerCase().indexOf("disablestream=true") < 0);
+    }
+
+    aRequest.QueryInterface(Ci.nsIChannel);
+
+    aRequest.QueryInterface(Ci.nsIWritablePropertyBag);
+
+    var contentDispositionFilename;
+    try {
+      contentDispositionFilename = aRequest.contentDispositionFilename;
+    } catch (e) {}
+
+    // Change the content type so we don't get stuck in a loop.
+    aRequest.setProperty("contentType", aRequest.contentType);
+    aRequest.contentType = "text/html";
+    if (isHttpRequest) {
+      // We trust PDF viewer, using no CSP
+      aRequest.setResponseHeader("Content-Security-Policy", "", false);
+      aRequest.setResponseHeader("Content-Security-Policy-Report-Only", "",
+                                 false);
+      // The viewer does not need to handle HTTP Refresh header.
+      aRequest.setResponseHeader("Refresh", "", false);
+    }
+
+    // The document will be loaded via the stream converter as html, but we
+    // may have come here via a download/attachment path. Force inline so we
+    // don't get redirected back to the external helper service.
+    aRequest.contentDisposition = Ci.nsIChannel.DISPOSITION_FORCE_INLINE;
+
+    // Creating storage for PDF data
+    var contentLength = aRequest.contentLength;
+    this.dataListener = new PdfDataListener(contentLength);
+    this.binaryStream = Cc["@mozilla.org/binaryinputstream;1"]
+                        .createInstance(Ci.nsIBinaryInputStream);
+
+    // Create a new channel that is viewer loaded as a resource.
+    var channel = NetUtil.newChannel({
+      uri: PDF_VIEWER_WEB_PAGE,
+      loadUsingSystemPrincipal: true,
+    });
+
+    var listener = this.listener;
+    var dataListener = this.dataListener;
+    // Proxy all the request observer calls, when it gets to onStopRequest
+    // we can get the dom window.  We also intentionally pass on the original
+    // request(aRequest) below so we don't overwrite the original channel and
+    // trigger an assertion.
+    var proxy = {
+      onStartRequest(request, context) {
+        listener.onStartRequest(aRequest, aContext);
+      },
+      onDataAvailable(request, context, inputStream, offset, count) {
+        listener.onDataAvailable(aRequest, aContext, inputStream,
+                                 offset, count);
+      },
+      onStopRequest(request, context, statusCode) {
+        // We get the DOM window here instead of before the request since it
+        // may have changed during a redirect.
+        var domWindow = getDOMWindow(channel);
+        var actions;
+        if (rangeRequest || streamRequest) {
+          actions = new RangedChromeActions(
+            domWindow, contentDispositionFilename, aRequest,
+            rangeRequest, streamRequest, dataListener);
+        } else {
+          actions = new StandardChromeActions(
+            domWindow, contentDispositionFilename, aRequest, dataListener);
+        }
+        var requestListener = new RequestListener(actions);
+        domWindow.addEventListener(PDFJS_EVENT_ID, function(event) {
+          requestListener.receive(event);
+        }, false, true);
+        if (actions.supportsIntegratedFind()) {
+          var findEventManager = new FindEventManager(domWindow);
+          findEventManager.bind();
+        }
+        listener.onStopRequest(aRequest, aContext, statusCode);
+
+        if (domWindow.frameElement) {
+          var isObjectEmbed = domWindow.frameElement.tagName !== "IFRAME" ||
+            domWindow.frameElement.className === "previewPluginContentFrame";
+        }
+      }
+    };
+
+    // Keep the URL the same so the browser sees it as the same.
+    channel.originalURI = aRequest.URI;
+    channel.loadGroup = aRequest.loadGroup;
+    channel.loadInfo.originAttributes = aRequest.loadInfo.originAttributes;
+
+    // We can use the resource principal when data is fetched by the chrome,
+    // e.g. useful for NoScript. Make make sure we reuse the origin attributes
+    // from the request channel to keep isolation consistent.
+    var ssm = Cc["@mozilla.org/scriptsecuritymanager;1"]
+                .getService(Ci.nsIScriptSecurityManager);
+    var uri = NetUtil.newURI(PDF_VIEWER_WEB_PAGE);
+    var resourcePrincipal =
+      ssm.createCodebasePrincipal(uri, aRequest.loadInfo.originAttributes);
+    aRequest.owner = resourcePrincipal;
+
+    channel.asyncOpen2(proxy);
+  },
+
+  // nsIRequestObserver::onStopRequest
+  onStopRequest(aRequest, aContext, aStatusCode) {
+    if (!this.dataListener) {
+      // Do nothing
+      return;
+    }
+
+    if (Components.isSuccessCode(aStatusCode)) {
+      this.dataListener.finish();
+    } else {
+      this.dataListener.error(aStatusCode);
+    }
+    delete this.dataListener;
+    delete this.binaryStream;
+  }
+};
+