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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: function() {
if (this._initialized)
return;
this._initialized = true;
Services.obs.addObserver(handleGUMRequest, "getUserMedia:request", 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: function() {
Services.obs.removeObserver(handleGUMRequest, "getUserMedia:request");
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: function(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: function(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: windowID,
innerWindowID: innerWindowID,
callID: callID,
documentURI: contentWindow.document.documentURI,
secure: isSecure,
};
mm.sendAsyncMessage("rtcpeer:Request", 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,
origin: aContentWindow.origin,
documentURI: aContentWindow.document.documentURI,
secure: aSecure,
requestTypes: requestTypes,
sharingScreen: sharingScreen,
sharingAudio: sharingAudio,
audioDevices: audioDevices,
videoDevices: 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();
}