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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {classes: Cc, interfaces: Ci, results: Cr, utils: Cu} = Components;
+
+this.EXPORTED_SYMBOLS = [ "ContentWebRTC" ];
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "MediaManagerService",
+ "@mozilla.org/mediaManagerService;1",
+ "nsIMediaManagerService");
+
+const kBrowserURL = "chrome://browser/content/browser.xul";
+
+this.ContentWebRTC = {
+ _initialized: false,
+
+ init() {
+ if (this._initialized)
+ return;
+
+ this._initialized = true;
+ Services.obs.addObserver(handleGUMRequest, "getUserMedia:request", false);
+ Services.obs.addObserver(handleGUMStop, "recording-device-stopped", false);
+ Services.obs.addObserver(handlePCRequest, "PeerConnection:request", false);
+ Services.obs.addObserver(updateIndicators, "recording-device-events", false);
+ Services.obs.addObserver(removeBrowserSpecificIndicator, "recording-window-ended", false);
+
+ if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT)
+ Services.obs.addObserver(processShutdown, "content-child-shutdown", false);
+ },
+
+ uninit() {
+ Services.obs.removeObserver(handleGUMRequest, "getUserMedia:request");
+ Services.obs.removeObserver(handleGUMStop, "recording-device-stopped");
+ Services.obs.removeObserver(handlePCRequest, "PeerConnection:request");
+ Services.obs.removeObserver(updateIndicators, "recording-device-events");
+ Services.obs.removeObserver(removeBrowserSpecificIndicator, "recording-window-ended");
+
+ if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT)
+ Services.obs.removeObserver(processShutdown, "content-child-shutdown");
+
+ this._initialized = false;
+ },
+
+ // Called only for 'unload' to remove pending gUM prompts in reloaded frames.
+ handleEvent(aEvent) {
+ let contentWindow = aEvent.target.defaultView;
+ let mm = getMessageManagerForWindow(contentWindow);
+ for (let key of contentWindow.pendingGetUserMediaRequests.keys()) {
+ mm.sendAsyncMessage("webrtc:CancelRequest", key);
+ }
+ for (let key of contentWindow.pendingPeerConnectionRequests.keys()) {
+ mm.sendAsyncMessage("rtcpeer:CancelRequest", key);
+ }
+ },
+
+ receiveMessage(aMessage) {
+ switch (aMessage.name) {
+ case "rtcpeer:Allow":
+ case "rtcpeer:Deny": {
+ let callID = aMessage.data.callID;
+ let contentWindow = Services.wm.getOuterWindowWithId(aMessage.data.windowID);
+ forgetPCRequest(contentWindow, callID);
+ let topic = (aMessage.name == "rtcpeer:Allow") ? "PeerConnection:response:allow" :
+ "PeerConnection:response:deny";
+ Services.obs.notifyObservers(null, topic, callID);
+ break;
+ }
+ case "webrtc:Allow": {
+ let callID = aMessage.data.callID;
+ let contentWindow = Services.wm.getOuterWindowWithId(aMessage.data.windowID);
+ let devices = contentWindow.pendingGetUserMediaRequests.get(callID);
+ forgetGUMRequest(contentWindow, callID);
+
+ let allowedDevices = Cc["@mozilla.org/array;1"]
+ .createInstance(Ci.nsIMutableArray);
+ for (let deviceIndex of aMessage.data.devices)
+ allowedDevices.appendElement(devices[deviceIndex], /* weak =*/ false);
+
+ Services.obs.notifyObservers(allowedDevices, "getUserMedia:response:allow", callID);
+ break;
+ }
+ case "webrtc:Deny":
+ denyGUMRequest(aMessage.data);
+ break;
+ case "webrtc:StopSharing":
+ Services.obs.notifyObservers(null, "getUserMedia:revoke", aMessage.data);
+ break;
+ }
+ }
+};
+
+function handlePCRequest(aSubject, aTopic, aData) {
+ let { windowID, innerWindowID, callID, isSecure } = aSubject;
+ let contentWindow = Services.wm.getOuterWindowWithId(windowID);
+
+ let mm = getMessageManagerForWindow(contentWindow);
+ if (!mm) {
+ // Workaround for Bug 1207784. To use WebRTC, add-ons right now use
+ // hiddenWindow.mozRTCPeerConnection which is only privileged on OSX. Other
+ // platforms end up here without a message manager.
+ // TODO: Remove once there's a better way (1215591).
+
+ // Skip permission check in the absence of a message manager.
+ Services.obs.notifyObservers(null, "PeerConnection:response:allow", callID);
+ return;
+ }
+
+ if (!contentWindow.pendingPeerConnectionRequests) {
+ setupPendingListsInitially(contentWindow);
+ }
+ contentWindow.pendingPeerConnectionRequests.add(callID);
+
+ let request = {
+ windowID,
+ innerWindowID,
+ callID,
+ documentURI: contentWindow.document.documentURI,
+ secure: isSecure,
+ };
+ mm.sendAsyncMessage("rtcpeer:Request", request);
+}
+
+function handleGUMStop(aSubject, aTopic, aData) {
+ let contentWindow = Services.wm.getOuterWindowWithId(aSubject.windowID);
+
+ let request = {
+ windowID: aSubject.windowID,
+ rawID: aSubject.rawID,
+ mediaSource: aSubject.mediaSource,
+ };
+
+ let mm = getMessageManagerForWindow(contentWindow);
+ if (mm)
+ mm.sendAsyncMessage("webrtc:StopRecording", request);
+}
+
+function handleGUMRequest(aSubject, aTopic, aData) {
+ let constraints = aSubject.getConstraints();
+ let secure = aSubject.isSecure;
+ let contentWindow = Services.wm.getOuterWindowWithId(aSubject.windowID);
+
+ contentWindow.navigator.mozGetUserMediaDevices(
+ constraints,
+ function(devices) {
+ // If the window has been closed while we were waiting for the list of
+ // devices, there's nothing to do in the callback anymore.
+ if (contentWindow.closed)
+ return;
+
+ prompt(contentWindow, aSubject.windowID, aSubject.callID,
+ constraints, devices, secure);
+ },
+ function(error) {
+ // bug 827146 -- In the future, the UI should catch NotFoundError
+ // and allow the user to plug in a device, instead of immediately failing.
+ denyGUMRequest({callID: aSubject.callID}, error);
+ },
+ aSubject.innerWindowID,
+ aSubject.callID);
+}
+
+function prompt(aContentWindow, aWindowID, aCallID, aConstraints, aDevices, aSecure) {
+ let audioDevices = [];
+ let videoDevices = [];
+ let devices = [];
+
+ // MediaStreamConstraints defines video as 'boolean or MediaTrackConstraints'.
+ let video = aConstraints.video || aConstraints.picture;
+ let audio = aConstraints.audio;
+ let sharingScreen = video && typeof(video) != "boolean" &&
+ video.mediaSource != "camera";
+ let sharingAudio = audio && typeof(audio) != "boolean" &&
+ audio.mediaSource != "microphone";
+ for (let device of aDevices) {
+ device = device.QueryInterface(Ci.nsIMediaDevice);
+ switch (device.type) {
+ case "audio":
+ // Check that if we got a microphone, we have not requested an audio
+ // capture, and if we have requested an audio capture, we are not
+ // getting a microphone instead.
+ if (audio && (device.mediaSource == "microphone") != sharingAudio) {
+ audioDevices.push({name: device.name, deviceIndex: devices.length,
+ id: device.rawId, mediaSource: device.mediaSource});
+ devices.push(device);
+ }
+ break;
+ case "video":
+ // Verify that if we got a camera, we haven't requested a screen share,
+ // or that if we requested a screen share we aren't getting a camera.
+ if (video && (device.mediaSource == "camera") != sharingScreen) {
+ let deviceObject = {name: device.name, deviceIndex: devices.length,
+ id: device.rawId, mediaSource: device.mediaSource};
+ if (device.scary)
+ deviceObject.scary = true;
+ videoDevices.push(deviceObject);
+ devices.push(device);
+ }
+ break;
+ }
+ }
+
+ let requestTypes = [];
+ if (videoDevices.length)
+ requestTypes.push(sharingScreen ? "Screen" : "Camera");
+ if (audioDevices.length)
+ requestTypes.push(sharingAudio ? "AudioCapture" : "Microphone");
+
+ if (!requestTypes.length) {
+ denyGUMRequest({callID: aCallID}, "NotFoundError");
+ return;
+ }
+
+ if (!aContentWindow.pendingGetUserMediaRequests) {
+ setupPendingListsInitially(aContentWindow);
+ }
+ aContentWindow.pendingGetUserMediaRequests.set(aCallID, devices);
+
+ let request = {
+ callID: aCallID,
+ windowID: aWindowID,
+ documentURI: aContentWindow.document.documentURI,
+ secure: aSecure,
+ requestTypes,
+ sharingScreen,
+ sharingAudio,
+ audioDevices,
+ videoDevices
+ };
+
+ let mm = getMessageManagerForWindow(aContentWindow);
+ mm.sendAsyncMessage("webrtc:Request", request);
+}
+
+function denyGUMRequest(aData, aError) {
+ let msg = null;
+ if (aError) {
+ msg = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsString);
+ msg.data = aError;
+ }
+ Services.obs.notifyObservers(msg, "getUserMedia:response:deny", aData.callID);
+
+ if (!aData.windowID)
+ return;
+ let contentWindow = Services.wm.getOuterWindowWithId(aData.windowID);
+ if (contentWindow.pendingGetUserMediaRequests)
+ forgetGUMRequest(contentWindow, aData.callID);
+}
+
+function forgetGUMRequest(aContentWindow, aCallID) {
+ aContentWindow.pendingGetUserMediaRequests.delete(aCallID);
+ forgetPendingListsEventually(aContentWindow);
+}
+
+function forgetPCRequest(aContentWindow, aCallID) {
+ aContentWindow.pendingPeerConnectionRequests.delete(aCallID);
+ forgetPendingListsEventually(aContentWindow);
+}
+
+function setupPendingListsInitially(aContentWindow) {
+ if (aContentWindow.pendingGetUserMediaRequests) {
+ return;
+ }
+ aContentWindow.pendingGetUserMediaRequests = new Map();
+ aContentWindow.pendingPeerConnectionRequests = new Set();
+ aContentWindow.addEventListener("unload", ContentWebRTC);
+}
+
+function forgetPendingListsEventually(aContentWindow) {
+ if (aContentWindow.pendingGetUserMediaRequests.size ||
+ aContentWindow.pendingPeerConnectionRequests.size) {
+ return;
+ }
+ aContentWindow.pendingGetUserMediaRequests = null;
+ aContentWindow.pendingPeerConnectionRequests = null;
+ aContentWindow.removeEventListener("unload", ContentWebRTC);
+}
+
+function updateIndicators(aSubject, aTopic, aData) {
+ if (aSubject instanceof Ci.nsIPropertyBag &&
+ aSubject.getProperty("requestURL") == kBrowserURL) {
+ // Ignore notifications caused by the browser UI showing previews.
+ return;
+ }
+
+ let contentWindowArray = MediaManagerService.activeMediaCaptureWindows;
+ let count = contentWindowArray.length;
+
+ let state = {
+ showGlobalIndicator: count > 0,
+ showCameraIndicator: false,
+ showMicrophoneIndicator: false,
+ showScreenSharingIndicator: ""
+ };
+
+ let cpmm = Cc["@mozilla.org/childprocessmessagemanager;1"]
+ .getService(Ci.nsIMessageSender);
+ cpmm.sendAsyncMessage("webrtc:UpdatingIndicators");
+
+ // If several iframes in the same page use media streams, it's possible to
+ // have the same top level window several times. We use a Set to avoid
+ // sending duplicate notifications.
+ let contentWindows = new Set();
+ for (let i = 0; i < count; ++i) {
+ contentWindows.add(contentWindowArray.queryElementAt(i, Ci.nsISupports).top);
+ }
+
+ for (let contentWindow of contentWindows) {
+ if (contentWindow.document.documentURI == kBrowserURL) {
+ // There may be a preview shown at the same time as other streams.
+ continue;
+ }
+
+ let tabState = getTabStateForContentWindow(contentWindow);
+ if (tabState.camera)
+ state.showCameraIndicator = true;
+ if (tabState.microphone)
+ state.showMicrophoneIndicator = true;
+ if (tabState.screen) {
+ if (tabState.screen == "Screen") {
+ state.showScreenSharingIndicator = "Screen";
+ } else if (tabState.screen == "Window") {
+ if (state.showScreenSharingIndicator != "Screen")
+ state.showScreenSharingIndicator = "Window";
+ } else if (tabState.screen == "Application") {
+ if (!state.showScreenSharingIndicator)
+ state.showScreenSharingIndicator = "Application";
+ } else if (tabState.screen == "Browser") {
+ if (!state.showScreenSharingIndicator)
+ state.showScreenSharingIndicator = "Browser";
+ }
+ }
+ let mm = getMessageManagerForWindow(contentWindow);
+ mm.sendAsyncMessage("webrtc:UpdateBrowserIndicators", tabState);
+ }
+
+ cpmm.sendAsyncMessage("webrtc:UpdateGlobalIndicators", state);
+}
+
+function removeBrowserSpecificIndicator(aSubject, aTopic, aData) {
+ let contentWindow = Services.wm.getOuterWindowWithId(aData).top;
+ if (contentWindow.document.documentURI == kBrowserURL) {
+ // Ignore notifications caused by the browser UI showing previews.
+ return;
+ }
+
+ let tabState = getTabStateForContentWindow(contentWindow);
+ if (!tabState.camera && !tabState.microphone && !tabState.screen)
+ tabState = {windowId: tabState.windowId};
+
+ let mm = getMessageManagerForWindow(contentWindow);
+ if (mm)
+ mm.sendAsyncMessage("webrtc:UpdateBrowserIndicators", tabState);
+}
+
+function getTabStateForContentWindow(aContentWindow) {
+ let camera = {}, microphone = {}, screen = {}, window = {}, app = {}, browser = {};
+ MediaManagerService.mediaCaptureWindowState(aContentWindow, camera, microphone,
+ screen, window, app, browser);
+ let tabState = {camera: camera.value, microphone: microphone.value};
+ if (screen.value)
+ tabState.screen = "Screen";
+ else if (window.value)
+ tabState.screen = "Window";
+ else if (app.value)
+ tabState.screen = "Application";
+ else if (browser.value)
+ tabState.screen = "Browser";
+
+ tabState.windowId = getInnerWindowIDForWindow(aContentWindow);
+ tabState.documentURI = aContentWindow.document.documentURI;
+
+ return tabState;
+}
+
+function getInnerWindowIDForWindow(aContentWindow) {
+ return aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+ .getInterface(Ci.nsIDOMWindowUtils)
+ .currentInnerWindowID;
+}
+
+function getMessageManagerForWindow(aContentWindow) {
+ let ir = aContentWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+ .getInterface(Ci.nsIDocShell)
+ .sameTypeRootTreeItem
+ .QueryInterface(Ci.nsIInterfaceRequestor);
+ try {
+ // If e10s is disabled, this throws NS_NOINTERFACE for closed tabs.
+ return ir.getInterface(Ci.nsIContentFrameMessageManager);
+ } catch (e) {
+ if (e.result == Cr.NS_NOINTERFACE) {
+ return null;
+ }
+ throw e;
+ }
+}
+
+function processShutdown() {
+ ContentWebRTC.uninit();
+}