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Quelle WebRTCParent.sys.mjs
Sprache: unbekannt
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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/. */
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
SitePermissions: "resource:///modules/SitePermissions.sys.mjs",
webrtcUI: "resource:///modules/webrtcUI.sys.mjs",
});
XPCOMUtils.defineLazyServiceGetter(
lazy,
"OSPermissions",
"@mozilla.org/ospermissionrequest;1",
"nsIOSPermissionRequest"
);
export class WebRTCParent extends JSWindowActorParent {
didDestroy() {
// Media stream tracks end on unload, so call stopRecording() on them early
// *before* we go away, to ensure we're working with the right principal.
this.stopRecording(this.manager.outerWindowId);
lazy.webrtcUI.forgetStreamsFromBrowserContext(this.browsingContext);
// Must clear activePerms here to prevent them from being read by laggard
// stopRecording() calls, which due to IPC, may come in *after* navigation.
// This is to prevent granting temporary grace periods to the wrong page.
lazy.webrtcUI.activePerms.delete(this.manager.outerWindowId);
}
getBrowser() {
return this.browsingContext.top.embedderElement;
}
receiveMessage(aMessage) {
switch (aMessage.name) {
case "rtcpeer:Request": {
let params = Object.freeze(
Object.assign(
{
origin: this.manager.documentPrincipal.origin,
},
aMessage.data
)
);
let blockers = Array.from(lazy.webrtcUI.peerConnectionBlockers);
(async function () {
for (let blocker of blockers) {
try {
let result = await blocker(params);
if (result == "deny") {
return false;
}
} catch (err) {
console.error(`error in PeerConnection blocker: ${err.message}`);
}
}
return true;
})().then(decision => {
let message;
if (decision) {
lazy.webrtcUI.emitter.emit("peer-request-allowed", params);
message = "rtcpeer:Allow";
} else {
lazy.webrtcUI.emitter.emit("peer-request-blocked", params);
message = "rtcpeer:Deny";
}
this.sendAsyncMessage(message, {
callID: params.callID,
windowID: params.windowID,
});
});
break;
}
case "rtcpeer:CancelRequest": {
let params = Object.freeze({
origin: this.manager.documentPrincipal.origin,
callID: aMessage.data,
});
lazy.webrtcUI.emitter.emit("peer-request-cancel", params);
break;
}
case "webrtc:Request": {
let data = aMessage.data;
// Record third party origins for telemetry.
let isThirdPartyOrigin =
this.manager.documentPrincipal.origin !=
this.manager.topWindowContext.documentPrincipal.origin;
data.isThirdPartyOrigin = isThirdPartyOrigin;
data.origin = this.manager.topWindowContext.documentPrincipal.origin;
let browser = this.getBrowser();
if (browser.fxrPermissionPrompt) {
// For Firefox Reality on Desktop, switch to a different mechanism to
// prompt the user since fewer permissions are available and since many
// UI dependencies are not available.
browser.fxrPermissionPrompt(data);
} else {
prompt(this, this.getBrowser(), data);
}
break;
}
case "webrtc:StopRecording":
this.stopRecording(
aMessage.data.windowID,
aMessage.data.mediaSource,
aMessage.data.rawID
);
break;
case "webrtc:CancelRequest": {
let browser = this.getBrowser();
// browser can be null when closing the window
if (browser) {
removePrompt(browser, aMessage.data);
}
break;
}
case "webrtc:UpdateIndicators": {
let { data } = aMessage;
data.documentURI = this.manager.documentURI?.spec;
if (data.windowId) {
if (!data.remove) {
data.principal = this.manager.topWindowContext.documentPrincipal;
}
lazy.webrtcUI.streamAddedOrRemoved(this.browsingContext, data);
}
this.updateIndicators(data);
break;
}
}
}
updateIndicators(aData) {
let browsingContext = this.browsingContext;
let state = lazy.webrtcUI.updateIndicators(browsingContext.top);
let browser = this.getBrowser();
if (!browser) {
return;
}
state.browsingContext = browsingContext;
state.windowId = aData.windowId;
let tabbrowser = browser.ownerGlobal.gBrowser;
if (tabbrowser) {
tabbrowser.updateBrowserSharing(browser, {
webRTC: state,
});
}
}
denyRequest(aRequest) {
this.sendAsyncMessage("webrtc:Deny", {
callID: aRequest.callID,
windowID: aRequest.windowID,
});
}
//
// Deny the request because the browser does not have access to the
// camera or microphone due to OS security restrictions. The user may
// have granted camera/microphone access to the site, but not have
// allowed the browser access in OS settings.
//
denyRequestNoPermission(aRequest) {
this.sendAsyncMessage("webrtc:Deny", {
callID: aRequest.callID,
windowID: aRequest.windowID,
noOSPermission: true,
});
}
//
// Check if we have permission to access the camera or screen-sharing and/or
// microphone at the OS level. Triggers a request to access the device if access
// is needed and the permission state has not yet been determined.
//
async checkOSPermission(camNeeded, micNeeded, scrNeeded) {
// Don't trigger OS permission requests for fake devices. Fake devices don't
// require OS permission and the dialogs are problematic in automated testing
// (where fake devices are used) because they require user interaction.
if (
!scrNeeded &&
Services.prefs.getBoolPref("media.navigator.streams.fake", false)
) {
return true;
}
let camStatus = {},
micStatus = {};
if (camNeeded || micNeeded) {
lazy.OSPermissions.getMediaCapturePermissionState(camStatus, micStatus);
}
if (camNeeded) {
let camPermission = camStatus.value;
let camAccessible = await this.checkAndGetOSPermission(
camPermission,
lazy.OSPermissions.requestVideoCapturePermission
);
if (!camAccessible) {
return false;
}
}
if (micNeeded) {
let micPermission = micStatus.value;
let micAccessible = await this.checkAndGetOSPermission(
micPermission,
lazy.OSPermissions.requestAudioCapturePermission
);
if (!micAccessible) {
return false;
}
}
let scrStatus = {};
if (scrNeeded) {
lazy.OSPermissions.getScreenCapturePermissionState(scrStatus);
if (scrStatus.value == lazy.OSPermissions.PERMISSION_STATE_DENIED) {
lazy.OSPermissions.maybeRequestScreenCapturePermission();
return false;
}
}
return true;
}
//
// Given a device's permission, return true if the device is accessible. If
// the device's permission is not yet determined, request access to the device.
// |requestPermissionFunc| must return a promise that resolves with true
// if the device is accessible and false otherwise.
//
async checkAndGetOSPermission(devicePermission, requestPermissionFunc) {
if (
devicePermission == lazy.OSPermissions.PERMISSION_STATE_DENIED ||
devicePermission == lazy.OSPermissions.PERMISSION_STATE_RESTRICTED
) {
return false;
}
if (devicePermission == lazy.OSPermissions.PERMISSION_STATE_NOTDETERMINED) {
let deviceAllowed = await requestPermissionFunc();
if (!deviceAllowed) {
return false;
}
}
return true;
}
stopRecording(aOuterWindowId, aMediaSource, aRawId) {
for (let { browsingContext, state } of lazy.webrtcUI._streams) {
if (browsingContext == this.browsingContext) {
let { principal } = state;
for (let { mediaSource, rawId } of state.devices) {
if (aRawId && (aRawId != rawId || aMediaSource != mediaSource)) {
continue;
}
// Deactivate this device (no aRawId means all devices).
this.deactivateDevicePerm(
aOuterWindowId,
mediaSource,
rawId,
principal
);
}
}
}
}
/**
* Add a device record to webrtcUI.activePerms, denoting a device as in use.
* Important to call for permission grace periods to work correctly.
*/
activateDevicePerm(aOuterWindowId, aMediaSource, aId) {
if (!lazy.webrtcUI.activePerms.has(this.manager.outerWindowId)) {
lazy.webrtcUI.activePerms.set(this.manager.outerWindowId, new Map());
}
lazy.webrtcUI.activePerms
.get(this.manager.outerWindowId)
.set(aOuterWindowId + aMediaSource + aId, aMediaSource);
}
/**
* Remove a device record from webrtcUI.activePerms, denoting a device as
* no longer in use by the site. Meaning: gUM requests for this device will
* no longer be implicitly granted through the webrtcUI.activePerms mechanism.
*
* However, if webrtcUI.deviceGracePeriodTimeoutMs is defined, the implicit
* grant is extended for an additional period of time through SitePermissions.
*/
deactivateDevicePerm(
aOuterWindowId,
aMediaSource,
aId,
aPermissionPrincipal
) {
// If we don't have active permissions for the given window anymore don't
// set a grace period. This happens if there has been a user revoke and
// webrtcUI clears the permissions.
if (!lazy.webrtcUI.activePerms.has(this.manager.outerWindowId)) {
return;
}
let map = lazy.webrtcUI.activePerms.get(this.manager.outerWindowId);
map.delete(aOuterWindowId + aMediaSource + aId);
// Add a permission grace period for camera and microphone only
if (
(aMediaSource != "camera" && aMediaSource != "microphone") ||
!this.browsingContext.top.embedderElement
) {
return;
}
let gracePeriodMs = lazy.webrtcUI.deviceGracePeriodTimeoutMs;
if (gracePeriodMs > 0) {
// A grace period is extended (even past navigation) to this outer window
// + origin + deviceId only. This avoids re-prompting without the user
// having to persist permission to the site, in a common case of a web
// conference asking them for the camera in a lobby page, before
// navigating to the actual meeting room page. Does not survive tab close.
//
// Caution: since navigation causes deactivation, we may be in the middle
// of one. We must pass in a principal & URI for SitePermissions to use
// instead of browser.currentURI, because the latter may point to a new
// page already, and we must not leak permission to unrelated pages.
//
let permissionName = [aMediaSource, aId].join("^");
lazy.SitePermissions.setForPrincipal(
aPermissionPrincipal,
permissionName,
lazy.SitePermissions.ALLOW,
lazy.SitePermissions.SCOPE_TEMPORARY,
this.browsingContext.top.embedderElement,
gracePeriodMs
);
}
}
/**
* Checks if the principal has sufficient permissions
* to fulfill the given request. If the request can be
* fulfilled, a message is sent to the child
* signaling that WebRTC permissions were given and
* this function will return true.
*/
checkRequestAllowed(aRequest, aPrincipal) {
if (!aRequest.secure) {
return false;
}
// Always prompt for screen sharing
if (aRequest.sharingScreen) {
return false;
}
let {
callID,
windowID,
audioInputDevices,
videoInputDevices,
audioOutputDevices,
hasInherentAudioConstraints,
hasInherentVideoConstraints,
audioOutputId,
} = aRequest;
if (audioOutputDevices?.length) {
// Prompt if a specific device is not requested, available and allowed.
let device = audioOutputDevices.find(({ id }) => id == audioOutputId);
if (
!device ||
!lazy.SitePermissions.getForPrincipal(
aPrincipal,
["speaker", device.id].join("^"),
this.getBrowser()
).state == lazy.SitePermissions.ALLOW
) {
return false;
}
this.sendAsyncMessage("webrtc:Allow", {
callID,
windowID,
devices: [device.deviceIndex],
});
return true;
}
let { perms } = Services;
if (
perms.testExactPermissionFromPrincipal(aPrincipal, "MediaManagerVideo")
) {
perms.removeFromPrincipal(aPrincipal, "MediaManagerVideo");
}
// Don't use persistent permissions from the top-level principal
// if we're handling a potentially insecure third party
// through a wildcard ("*") allow attribute.
let limited = aRequest.secondOrigin;
let map = lazy.webrtcUI.activePerms.get(this.manager.outerWindowId);
// We consider a camera or mic active if it is active or was active within a
// grace period of milliseconds ago.
const isAllowed = ({ mediaSource, rawId }, permissionID) =>
map?.get(windowID + mediaSource + rawId) ||
(!limited &&
(lazy.SitePermissions.getForPrincipal(aPrincipal, permissionID).state ==
lazy.SitePermissions.ALLOW ||
lazy.SitePermissions.getForPrincipal(
aPrincipal,
[mediaSource, rawId].join("^"),
this.getBrowser()
).state == lazy.SitePermissions.ALLOW));
let microphone;
if (audioInputDevices.length) {
for (let device of audioInputDevices) {
if (isAllowed(device, "microphone")) {
microphone = device;
break;
}
if (hasInherentAudioConstraints) {
// Inherent constraints suggest site is looking for a specific mic
break;
}
// Some sites don't look too hard at what they get, and spam gUM without
// adjusting what they ask for to match what they got last time. To keep
// users in charge and reduce prompts, ignore other constraints by
// returning the most-fit microphone a site already has access to.
}
if (!microphone) {
return false;
}
}
let camera;
if (videoInputDevices.length) {
for (let device of videoInputDevices) {
if (isAllowed(device, "camera")) {
camera = device;
break;
}
if (hasInherentVideoConstraints) {
// Inherent constraints suggest site is looking for a specific camera
break;
}
// Some sites don't look too hard at what they get, and spam gUM without
// adjusting what they ask for to match what they got last time. To keep
// users in charge and reduce prompts, ignore other constraints by
// returning the most-fit camera a site already has access to.
}
if (!camera) {
return false;
}
}
let devices = [];
if (camera) {
perms.addFromPrincipal(
aPrincipal,
"MediaManagerVideo",
perms.ALLOW_ACTION,
perms.EXPIRE_SESSION
);
devices.push(camera.deviceIndex);
this.activateDevicePerm(windowID, camera.mediaSource, camera.rawId);
}
if (microphone) {
devices.push(microphone.deviceIndex);
this.activateDevicePerm(
windowID,
microphone.mediaSource,
microphone.rawId
);
}
this.checkOSPermission(!!camera, !!microphone, false).then(
havePermission => {
if (havePermission) {
this.sendAsyncMessage("webrtc:Allow", { callID, windowID, devices });
} else {
this.denyRequestNoPermission(aRequest);
}
}
);
return true;
}
}
function prompt(aActor, aBrowser, aRequest) {
let {
audioInputDevices,
videoInputDevices,
audioOutputDevices,
sharingScreen,
sharingAudio,
requestTypes,
} = aRequest;
let principal =
Services.scriptSecurityManager.createContentPrincipalFromOrigin(
aRequest.origin
);
// For add-on principals, we immediately check for permission instead
// of waiting for the notification to focus. This allows for supporting
// cases such as browserAction popups where no prompt is shown.
if (principal.addonPolicy) {
let isPopup = false;
let isBackground = false;
for (let view of principal.addonPolicy.extension.views) {
if (view.viewType == "popup" && view.xulBrowser == aBrowser) {
isPopup = true;
}
if (view.viewType == "background" && view.xulBrowser == aBrowser) {
isBackground = true;
}
}
// Recording from background pages is considered too sensitive and will
// always be denied.
if (isBackground) {
aActor.denyRequest(aRequest);
return;
}
// If the request comes from a popup, we don't want to show the prompt,
// but we do want to allow the request if the user previously gave permission.
if (isPopup) {
if (!aActor.checkRequestAllowed(aRequest, principal, aBrowser)) {
aActor.denyRequest(aRequest);
}
return;
}
}
// If the user has already denied access once in this tab,
// deny again without even showing the notification icon.
for (const type of requestTypes) {
const permissionID =
type == "AudioCapture" ? "microphone" : type.toLowerCase();
if (
lazy.SitePermissions.getForPrincipal(principal, permissionID, aBrowser)
.state == lazy.SitePermissions.BLOCK
) {
aActor.denyRequest(aRequest);
return;
}
}
let chromeDoc = aBrowser.ownerDocument;
const localization = new Localization(
["browser/webrtcIndicator.ftl", "branding/brand.ftl"],
true
);
/** @type {"Screen" | "Camera" | null} */
let reqVideoInput = null;
if (videoInputDevices.length) {
reqVideoInput = sharingScreen ? "Screen" : "Camera";
}
/** @type {"AudioCapture" | "Microphone" | null} */
let reqAudioInput = null;
if (audioInputDevices.length) {
reqAudioInput = sharingAudio ? "AudioCapture" : "Microphone";
}
const reqAudioOutput = !!audioOutputDevices.length;
const stringId = getPromptMessageId(
reqVideoInput,
reqAudioInput,
reqAudioOutput,
!!aRequest.secondOrigin
);
let message;
let originToShow;
if (principal.schemeIs("file")) {
message = localization.formatValueSync(stringId + "-with-file");
originToShow = null;
} else {
message = localization.formatValueSync(stringId, {
origin: "<>",
thirdParty: "{}",
});
originToShow = lazy.webrtcUI.getHostOrExtensionName(principal.URI);
}
let notification; // Used by action callbacks.
const actionL10nIds = [{ id: "webrtc-action-allow" }];
let notificationSilencingEnabled = Services.prefs.getBoolPref(
"privacy.webrtc.allowSilencingNotifications"
);
const isNotNowLabelEnabled =
reqAudioOutput || allowedOrActiveCameraOrMicrophone(aBrowser);
let secondaryActions = [];
if (reqAudioOutput || (notificationSilencingEnabled && sharingScreen)) {
// We want to free up the checkbox at the bottom of the permission
// panel for the notification silencing option, so we use a
// different configuration for the permissions panel when
// notification silencing is enabled.
let permissionName = reqAudioOutput ? "speaker" : "screen";
// When selecting speakers, we always offer 'Not now' instead of 'Block'.
// When selecting screens, we offer 'Not now' if and only if we have a
// (temporary) allow permission for some mic/cam device.
const id = isNotNowLabelEnabled
? "webrtc-action-not-now"
: "webrtc-action-block";
actionL10nIds.push({ id }, { id: "webrtc-action-always-block" });
secondaryActions = [
{
callback() {
aActor.denyRequest(aRequest);
if (!isNotNowLabelEnabled) {
lazy.SitePermissions.setForPrincipal(
principal,
permissionName,
lazy.SitePermissions.BLOCK,
lazy.SitePermissions.SCOPE_TEMPORARY,
notification.browser
);
}
},
},
{
callback() {
aActor.denyRequest(aRequest);
lazy.SitePermissions.setForPrincipal(
principal,
permissionName,
lazy.SitePermissions.BLOCK,
lazy.SitePermissions.SCOPE_PERSISTENT,
notification.browser
);
},
},
];
} else {
// We have a (temporary) allow permission for some device
// hence we offer a 'Not now' label instead of 'Block'.
const id = isNotNowLabelEnabled
? "webrtc-action-not-now"
: "webrtc-action-block";
actionL10nIds.push({ id });
secondaryActions = [
{
callback(aState) {
aActor.denyRequest(aRequest);
const isPersistent = aState?.checkboxChecked;
// Choosing 'Not now' will not set a block permission
// we just deny the request. This enables certain use cases
// where sites want to switch devices, but users back out of the permission request
// (See Bug 1609578).
// Selecting 'Remember this decision' and clicking 'Not now' will set a persistent block
if (!isPersistent && isNotNowLabelEnabled) {
return;
}
// Denying a camera / microphone prompt means we set a temporary or
// persistent permission block. There may still be active grace period
// permissions at this point. We need to remove them.
clearTemporaryGrants(
notification.browser,
reqVideoInput === "Camera",
!!reqAudioInput
);
const scope = isPersistent
? lazy.SitePermissions.SCOPE_PERSISTENT
: lazy.SitePermissions.SCOPE_TEMPORARY;
if (reqAudioInput) {
if (!isPersistent) {
// After a temporary block, having permissions.query() calls
// persistently report "granted" would be misleading
maybeClearAlwaysAsk(
principal,
"microphone",
notification.browser
);
}
lazy.SitePermissions.setForPrincipal(
principal,
"microphone",
lazy.SitePermissions.BLOCK,
scope,
notification.browser
);
}
if (reqVideoInput) {
if (!isPersistent && !sharingScreen) {
// After a temporary block, having permissions.query() calls
// persistently report "granted" would be misleading
maybeClearAlwaysAsk(principal, "camera", notification.browser);
}
lazy.SitePermissions.setForPrincipal(
principal,
sharingScreen ? "screen" : "camera",
lazy.SitePermissions.BLOCK,
scope,
notification.browser
);
}
},
},
];
}
// The formatMessagesSync method returns an array of results
// for each message that was requested, and for the ones with
// attributes, returns an attributes array with objects like:
// { name: "label", value: "somevalue" }
const [mainMessage, ...secondaryMessages] = localization
.formatMessagesSync(actionL10nIds)
.map(msg =>
msg.attributes.reduce(
(acc, { name, value }) => ({ ...acc, [name]: value }),
{}
)
);
const mainAction = {
label: mainMessage.label,
accessKey: mainMessage.accesskey,
// The real callback will be set during the "showing" event. The
// empty function here is so that PopupNotifications.show doesn't
// reject the action.
callback() {},
};
for (let i = 0; i < secondaryActions.length; ++i) {
secondaryActions[i].label = secondaryMessages[i].label;
secondaryActions[i].accessKey = secondaryMessages[i].accesskey;
}
let options = {
name: originToShow,
persistent: true,
hideClose: true,
eventCallback(aTopic, aNewBrowser, isCancel) {
if (aTopic == "swapping") {
return true;
}
let doc = this.browser.ownerDocument;
// Clean-up video streams of screensharing previews.
if (
reqVideoInput !== "Screen" ||
aTopic == "dismissed" ||
aTopic == "removed"
) {
let video = doc.getElementById("webRTC-previewVideo");
video.deviceId = null; // Abort previews still being started.
if (video.stream) {
video.stream.getTracks().forEach(t => t.stop());
video.stream = null;
video.src = null;
doc.getElementById("webRTC-preview").hidden = true;
}
let menupopup = doc.getElementById("webRTC-selectWindow-menupopup");
if (menupopup._commandEventListener) {
menupopup.removeEventListener(
"command",
menupopup._commandEventListener
);
menupopup._commandEventListener = null;
}
}
if (aTopic == "removed" && notification && isCancel) {
// The notification has been cancelled (e.g. due to entering
// full-screen). Also cancel the webRTC request.
aActor.denyRequest(aRequest);
} else if (
aTopic == "shown" &&
audioOutputDevices.length > 1 &&
!notification.wasDismissed
) {
// Focus the list on first show so that arrow keys select the speaker.
doc.getElementById("webRTC-selectSpeaker-richlistbox").focus();
}
if (aTopic != "showing") {
return false;
}
// If BLOCK has been set persistently in the permission manager or has
// been set on the tab, then it is handled synchronously before we add
// the notification.
// Handling of ALLOW is delayed until the popupshowing event,
// to avoid granting permissions automatically to background tabs.
if (aActor.checkRequestAllowed(aRequest, principal, aBrowser)) {
this.remove();
return true;
}
/**
* Prepare the device selector for one kind of device.
* @param {Object[]} devices - available devices of this kind.
* @param {string} IDPrefix - indicating kind of device and so
* associated UI elements.
* @param {string[]} describedByIDs - an array to which might be
* appended ids of elements that describe the panel, for the caller to
* use in the aria-describedby attribute.
*/
function listDevices(devices, IDPrefix, describedByIDs) {
let labelID = `${IDPrefix}-single-device-label`;
let list;
let itemParent;
if (IDPrefix == "webRTC-selectSpeaker") {
list = doc.getElementById(`${IDPrefix}-richlistbox`);
itemParent = list;
} else {
itemParent = doc.getElementById(`${IDPrefix}-menupopup`);
list = itemParent.parentNode; // menulist
}
while (itemParent.lastChild) {
itemParent.removeChild(itemParent.lastChild);
}
// Removing the child nodes of a menupopup doesn't clear the value
// attribute of its menulist. Similary for richlistbox state. This can
// have unfortunate side effects when the list is rebuilt with a
// different content, so we set the selectedIndex explicitly to reset
// state.
let defaultIndex = 0;
for (let device of devices) {
let item = addDeviceToList(list, device.name, device.deviceIndex);
if (IDPrefix == "webRTC-selectSpeaker") {
item.addEventListener("dblclick", event => {
// Allow the chosen speakers via
// .popup-notification-primary-button so that
// "security.notification_enable_delay" is checked.
event.target.closest("popupnotification").button.doCommand();
});
if (device.id == aRequest.audioOutputId) {
defaultIndex = device.deviceIndex;
}
}
}
list.selectedIndex = defaultIndex;
let label = doc.getElementById(labelID);
if (devices.length == 1) {
describedByIDs.push(`${IDPrefix}-icon`, labelID);
label.value = devices[0].name;
label.hidden = false;
list.hidden = true;
} else {
label.hidden = true;
list.hidden = false;
}
}
let notificationElement = doc.getElementById(
"webRTC-shareDevices-notification"
);
function checkDisabledWindowMenuItem() {
let list = doc.getElementById("webRTC-selectWindow-menulist");
let item = list.selectedItem;
if (!item || item.hasAttribute("disabled")) {
notificationElement.setAttribute("invalidselection", "true");
} else {
notificationElement.removeAttribute("invalidselection");
}
}
function listScreenShareDevices(menupopup, devices) {
while (menupopup.lastChild) {
menupopup.removeChild(menupopup.lastChild);
}
// Removing the child nodes of the menupopup doesn't clear the value
// attribute of the menulist. This can have unfortunate side effects
// when the list is rebuilt with a different content, so we remove
// the value attribute and unset the selectedItem explicitly.
menupopup.parentNode.removeAttribute("value");
menupopup.parentNode.selectedItem = null;
// "Select a Window or Screen" is the default because we can't and don't
// want to pick a 'default' window to share (Full screen is "scary").
addDeviceToList(
menupopup.parentNode,
localization.formatValueSync("webrtc-pick-window-or-screen"),
"-1"
);
menupopup.appendChild(doc.createXULElement("menuseparator"));
let isPipeWireDetected = false;
// Build the list of 'devices'.
let monitorIndex = 1;
for (let i = 0; i < devices.length; ++i) {
let device = devices[i];
let type = device.mediaSource;
let name;
if (device.canRequestOsLevelPrompt) {
// When we share content by PipeWire add only one item to the device
// list. When it's selected PipeWire portal dialog is opened and
// user confirms actual window/screen sharing there.
// Don't mark it as scary as there's an extra confirmation step by
// PipeWire portal dialog.
isPipeWireDetected = true;
let item = addDeviceToList(
menupopup.parentNode,
localization.formatValueSync("webrtc-share-pipe-wire-portal"),
i,
type
);
item.deviceId = device.rawId;
item.mediaSource = type;
// In this case the OS sharing dialog will be the only option and
// can be safely pre-selected.
menupopup.parentNode.selectedItem = item;
continue;
} else if (type == "screen") {
// Building screen list from available screens.
if (device.name == "Primary Monitor") {
name = localization.formatValueSync("webrtc-share-entire-screen");
} else {
name = localization.formatValueSync("webrtc-share-monitor", {
monitorIndex,
});
++monitorIndex;
}
} else {
name = device.name;
if (type == "application") {
// The application names returned by the platform are of the form:
// <window count>\x1e<application name>
const [count, appName] = name.split("\x1e");
name = localization.formatValueSync("webrtc-share-application", {
appName,
windowCount: parseInt(count),
});
}
}
let item = addDeviceToList(menupopup.parentNode, name, i, type);
item.deviceId = device.rawId;
item.mediaSource = type;
if (device.scary) {
item.scary = true;
}
}
// Always re-select the "No <type>" item.
doc
.getElementById("webRTC-selectWindow-menulist")
.removeAttribute("value");
doc.getElementById("webRTC-all-windows-shared").hidden = true;
menupopup._commandEventListener = event => {
checkDisabledWindowMenuItem();
let video = doc.getElementById("webRTC-previewVideo");
if (video.stream) {
video.stream.getTracks().forEach(t => t.stop());
video.stream = null;
}
const { deviceId, mediaSource, scary } = event.target;
if (deviceId == undefined) {
doc.getElementById("webRTC-preview").hidden = true;
video.src = null;
return;
}
let warning = doc.getElementById("webRTC-previewWarning");
let warningBox = doc.getElementById("webRTC-previewWarningBox");
warningBox.hidden = !scary;
let chromeWin = doc.defaultView;
if (scary) {
const warnId =
mediaSource == "screen"
? "webrtc-share-screen-warning"
: "webrtc-share-browser-warning";
doc.l10n.setAttributes(warning, warnId);
const learnMore = doc.getElementById(
"webRTC-previewWarning-learnMore"
);
const baseURL = Services.urlFormatter.formatURLPref(
"app.support.baseURL"
);
learnMore.setAttribute("href", baseURL + "screenshare-safety");
doc.l10n.setAttributes(learnMore, "webrtc-share-screen-learn-more");
// On Catalina, we don't want to blow our chance to show the
// OS-level helper prompt to enable screen recording if the user
// intends to reject anyway. OTOH showing it when they click Allow
// is too late. A happy middle is to show it when the user makes a
// choice in the picker. This already happens implicitly if the
// user chooses "Entire desktop", as a side-effect of our preview,
// we just need to also do it if they choose "Firefox". These are
// the lone two options when permission is absent on Catalina.
// Ironically, these are the two sources marked "scary" from a
// web-sharing perspective, which is why this code resides here.
// A restart doesn't appear to be necessary in spite of OS wording.
let scrStatus = {};
lazy.OSPermissions.getScreenCapturePermissionState(scrStatus);
if (scrStatus.value == lazy.OSPermissions.PERMISSION_STATE_DENIED) {
lazy.OSPermissions.maybeRequestScreenCapturePermission();
}
}
let perms = Services.perms;
let chromePrincipal =
Services.scriptSecurityManager.getSystemPrincipal();
perms.addFromPrincipal(
chromePrincipal,
"MediaManagerVideo",
perms.ALLOW_ACTION,
perms.EXPIRE_SESSION
);
// We don't have access to any screen content besides our browser tabs
// on Wayland, therefore there are no previews we can show.
if (
(!isPipeWireDetected || mediaSource == "browser") &&
Services.prefs.getBoolPref(
"media.getdisplaymedia.previews.enabled",
true
)
) {
video.deviceId = deviceId;
let constraints = {
video: { mediaSource, deviceId: { exact: deviceId } },
};
chromeWin.navigator.mediaDevices.getUserMedia(constraints).then(
stream => {
if (video.deviceId != deviceId) {
// The user has selected a different device or closed the panel
// before getUserMedia finished.
stream.getTracks().forEach(t => t.stop());
return;
}
video.srcObject = stream;
video.stream = stream;
doc.getElementById("webRTC-preview").hidden = false;
video.onloadedmetadata = function () {
video.play();
};
},
err => {
if (
err.name == "OverconstrainedError" &&
err.constraint == "deviceId"
) {
// Window has disappeared since enumeration, which can happen.
// No preview for you.
return;
}
console.error(
`error in preview: ${err.message} ${err.constraint}`
);
}
);
}
};
menupopup.addEventListener("command", menupopup._commandEventListener);
}
function addDeviceToList(list, deviceName, deviceIndex, type) {
let item = list.appendItem(deviceName, deviceIndex);
item.setAttribute("tooltiptext", deviceName);
if (type) {
item.setAttribute("devicetype", type);
}
if (deviceIndex == "-1") {
item.setAttribute("disabled", true);
}
return item;
}
doc.getElementById("webRTC-selectCamera").hidden =
reqVideoInput !== "Camera";
doc.getElementById("webRTC-selectWindowOrScreen").hidden =
reqVideoInput !== "Screen";
doc.getElementById("webRTC-selectMicrophone").hidden =
reqAudioInput !== "Microphone";
doc.getElementById("webRTC-selectSpeaker").hidden = !reqAudioOutput;
let describedByIDs = ["webRTC-shareDevices-notification-description"];
if (sharingScreen) {
let windowMenupopup = doc.getElementById(
"webRTC-selectWindow-menupopup"
);
listScreenShareDevices(windowMenupopup, videoInputDevices);
checkDisabledWindowMenuItem();
} else {
listDevices(videoInputDevices, "webRTC-selectCamera", describedByIDs);
notificationElement.removeAttribute("invalidselection");
}
if (!sharingAudio) {
listDevices(
audioInputDevices,
"webRTC-selectMicrophone",
describedByIDs
);
}
listDevices(audioOutputDevices, "webRTC-selectSpeaker", describedByIDs);
// PopupNotifications knows to clear the aria-describedby attribute
// when hiding, so we don't have to worry about cleaning it up ourselves.
chromeDoc.defaultView.PopupNotifications.panel.setAttribute(
"aria-describedby",
describedByIDs.join(" ")
);
this.mainAction.callback = async function (aState) {
let remember = false;
let silenceNotifications = false;
if (notificationSilencingEnabled && sharingScreen) {
silenceNotifications = aState && aState.checkboxChecked;
} else {
remember = aState && aState.checkboxChecked;
}
let allowedDevices = [];
let perms = Services.perms;
if (reqVideoInput) {
let listId = sharingScreen
? "webRTC-selectWindow-menulist"
: "webRTC-selectCamera-menulist";
let videoDeviceIndex = doc.getElementById(listId).value;
let allowVideoDevice = videoDeviceIndex != "-1";
if (allowVideoDevice) {
allowedDevices.push(videoDeviceIndex);
// Session permission will be removed after use
// (it's really one-shot, not for the entire session)
perms.addFromPrincipal(
principal,
"MediaManagerVideo",
perms.ALLOW_ACTION,
perms.EXPIRE_SESSION
);
let { mediaSource, rawId } = videoInputDevices.find(
({ deviceIndex }) => deviceIndex == videoDeviceIndex
);
aActor.activateDevicePerm(aRequest.windowID, mediaSource, rawId);
if (!sharingScreen) {
persistGrantOrPromptPermission(principal, "camera", remember);
}
}
}
if (reqAudioInput === "Microphone") {
let audioDeviceIndex = doc.getElementById(
"webRTC-selectMicrophone-menulist"
).value;
let allowMic = audioDeviceIndex != "-1";
if (allowMic) {
allowedDevices.push(audioDeviceIndex);
let { mediaSource, rawId } = audioInputDevices.find(
({ deviceIndex }) => deviceIndex == audioDeviceIndex
);
aActor.activateDevicePerm(aRequest.windowID, mediaSource, rawId);
persistGrantOrPromptPermission(principal, "microphone", remember);
}
} else if (reqAudioInput === "AudioCapture") {
// Only one device possible for audio capture.
allowedDevices.push(0);
}
if (reqAudioOutput) {
let audioDeviceIndex = doc.getElementById(
"webRTC-selectSpeaker-richlistbox"
).value;
let allowSpeaker = audioDeviceIndex != "-1";
if (allowSpeaker) {
allowedDevices.push(audioDeviceIndex);
let { id } = audioOutputDevices.find(
({ deviceIndex }) => deviceIndex == audioDeviceIndex
);
lazy.SitePermissions.setForPrincipal(
principal,
["speaker", id].join("^"),
lazy.SitePermissions.ALLOW
);
}
}
if (!allowedDevices.length) {
aActor.denyRequest(aRequest);
return;
}
const camNeeded = reqVideoInput === "Camera";
const micNeeded = !!reqAudioInput;
const scrNeeded = reqVideoInput === "Screen";
const havePermission = await aActor.checkOSPermission(
camNeeded,
micNeeded,
scrNeeded
);
if (!havePermission) {
aActor.denyRequestNoPermission(aRequest);
return;
}
aActor.sendAsyncMessage("webrtc:Allow", {
callID: aRequest.callID,
windowID: aRequest.windowID,
devices: allowedDevices,
suppressNotifications: silenceNotifications,
});
};
// If we haven't handled the permission yet, we want to show the doorhanger.
return false;
},
};
function shouldShowAlwaysRemember() {
// Don't offer "always remember" action in PB mode
if (lazy.PrivateBrowsingUtils.isBrowserPrivate(aBrowser)) {
return false;
}
// Don't offer "always remember" action in maybe unsafe permission
// delegation
if (aRequest.secondOrigin) {
return false;
}
// Speaker grants are always remembered, so no checkbox is required.
if (reqAudioOutput) {
return false;
}
return true;
}
function getRememberCheckboxLabel() {
if (reqVideoInput == "Camera") {
if (reqAudioInput == "Microphone") {
return "webrtc-remember-allow-checkbox-camera-and-microphone";
}
return "webrtc-remember-allow-checkbox-camera";
}
if (reqAudioInput == "Microphone") {
return "webrtc-remember-allow-checkbox-microphone";
}
return "webrtc-remember-allow-checkbox";
}
if (shouldShowAlwaysRemember()) {
// Disable the permanent 'Allow' action if the connection isn't secure, or for
// screen/audio sharing (because we can't guess which window the user wants to
// share without prompting). Note that we never enter this block for private
// browsing windows.
let reason = "";
if (sharingScreen) {
reason = "webrtc-reason-for-no-permanent-allow-screen";
} else if (sharingAudio) {
reason = "webrtc-reason-for-no-permanent-allow-audio";
} else if (!aRequest.secure) {
reason = "webrtc-reason-for-no-permanent-allow-insecure";
}
options.checkbox = {
label: localization.formatValueSync(getRememberCheckboxLabel()),
checked: principal.isAddonOrExpandedAddonPrincipal,
checkedState: reason
? {
disableMainAction: true,
warningLabel: localization.formatValueSync(reason),
}
: undefined,
};
}
// If the notification silencing feature is enabled and we're sharing a
// screen, then the checkbox for the permission panel is what controls
// notification silencing.
if (notificationSilencingEnabled && sharingScreen) {
options.checkbox = {
label: localization.formatValueSync("webrtc-mute-notifications-checkbox"),
checked: false,
checkedState: {
disableMainAction: false,
},
};
}
let anchorId = "webRTC-shareDevices-notification-icon";
if (reqVideoInput === "Screen") {
anchorId = "webRTC-shareScreen-notification-icon";
} else if (!reqVideoInput) {
if (reqAudioInput && !reqAudioOutput) {
anchorId = "webRTC-shareMicrophone-notification-icon";
} else if (!reqAudioInput && reqAudioOutput) {
anchorId = "webRTC-shareSpeaker-notification-icon";
}
}
if (aRequest.secondOrigin) {
options.secondName = lazy.webrtcUI.getHostOrExtensionName(
null,
aRequest.secondOrigin
);
}
notification = chromeDoc.defaultView.PopupNotifications.show(
aBrowser,
"webRTC-shareDevices",
message,
anchorId,
mainAction,
secondaryActions,
options
);
notification.callID = aRequest.callID;
}
/**
* @param {"Screen" | "Camera" | null} reqVideoInput
* @param {"AudioCapture" | "Microphone" | null} reqAudioInput
* @param {boolean} reqAudioOutput
* @param {boolean} delegation - Is the access delegated to a third party?
* @returns {string} Localization message identifier
*/
function getPromptMessageId(
reqVideoInput,
reqAudioInput,
reqAudioOutput,
delegation
) {
switch (reqVideoInput) {
case "Camera":
switch (reqAudioInput) {
case "Microphone":
return delegation
? "webrtc-allow-share-camera-and-microphone-unsafe-delegation"
: "webrtc-allow-share-camera-and-microphone";
case "AudioCapture":
return delegation
? "webrtc-allow-share-camera-and-audio-capture-unsafe-delegation"
: "webrtc-allow-share-camera-and-audio-capture";
default:
return delegation
? "webrtc-allow-share-camera-unsafe-delegation"
: "webrtc-allow-share-camera";
}
case "Screen":
switch (reqAudioInput) {
case "Microphone":
return delegation
? "webrtc-allow-share-screen-and-microphone-unsafe-delegation"
: "webrtc-allow-share-screen-and-microphone";
case "AudioCapture":
return delegation
? "webrtc-allow-share-screen-and-audio-capture-unsafe-delegation"
: "webrtc-allow-share-screen-and-audio-capture";
default:
return delegation
? "webrtc-allow-share-screen-unsafe-delegation"
: "webrtc-allow-share-screen";
}
default:
switch (reqAudioInput) {
case "Microphone":
return delegation
? "webrtc-allow-share-microphone-unsafe-delegation"
: "webrtc-allow-share-microphone";
case "AudioCapture":
return delegation
? "webrtc-allow-share-audio-capture-unsafe-delegation"
: "webrtc-allow-share-audio-capture";
default:
// This should be always true, if we've reached this far.
if (reqAudioOutput) {
return delegation
? "webrtc-allow-share-speaker-unsafe-delegation"
: "webrtc-allow-share-speaker";
}
return undefined;
}
}
}
/**
* Checks whether we have a microphone/camera in use by checking the activePerms map
* or if we have an allow permission for a microphone/camera in sitePermissions
* @param {Browser} browser - Browser to find all active and allowed microphone and camera devices for
* @return true if one of the above conditions is met
*/
function allowedOrActiveCameraOrMicrophone(browser) {
// Do we have an allow permission for cam/mic in the permissions manager?
if (
lazy.SitePermissions.getAllForBrowser(browser).some(perm => {
return (
perm.state == lazy.SitePermissions.ALLOW &&
(perm.id.startsWith("camera") || perm.id.startsWith("microphone"))
);
})
) {
// Return early, no need to check for active devices
return true;
}
// Do we have an active device?
return (
// Find all windowIDs that belong to our browsing contexts
browser.browsingContext
.getAllBrowsingContextsInSubtree()
// Only keep the outerWindowIds
.map(bc => bc.currentWindowGlobal?.outerWindowId)
.filter(id => id != null)
// We have an active device if one of our windowIds has a non empty map in the activePerms map
// that includes one device of type "camera" or "microphone"
.some(id => {
let map = lazy.webrtcUI.activePerms.get(id);
if (!map) {
// This windowId has no active device
return false;
}
// Let's see if one of the devices is a camera or a microphone
let types = [...map.values()];
return types.includes("microphone") || types.includes("camera");
})
);
}
function removePrompt(aBrowser, aCallId) {
let chromeWin = aBrowser.ownerGlobal;
let notification = chromeWin.PopupNotifications.getNotification(
"webRTC-shareDevices",
aBrowser
);
if (notification && notification.callID == aCallId) {
notification.remove();
}
}
/**
* Clears temporary permission grants used for WebRTC device grace periods.
* @param browser - Browser element to clear permissions for.
* @param {boolean} clearCamera - Clear camera grants.
* @param {boolean} clearMicrophone - Clear microphone grants.
*/
function clearTemporaryGrants(browser, clearCamera, clearMicrophone) {
if (!clearCamera && !clearMicrophone) {
// Nothing to clear.
return;
}
let perms = lazy.SitePermissions.getAllForBrowser(browser);
perms
.filter(perm => {
let [id, key] = perm.id.split(lazy.SitePermissions.PERM_KEY_DELIMITER);
// We only want to clear WebRTC grace periods. These are temporary, device
// specifc (double-keyed) microphone or camera permissions.
return (
key &&
perm.state == lazy.SitePermissions.ALLOW &&
perm.scope == lazy.SitePermissions.SCOPE_TEMPORARY &&
((clearCamera && id == "camera") ||
(clearMicrophone && id == "microphone"))
);
})
.forEach(perm =>
lazy.SitePermissions.removeFromPrincipal(null, perm.id, browser)
);
}
/**
* Persist an ALLOW state if the remember option is true.
* Otherwise, persist PROMPT so that we can later tell the site
* that permission was granted once before.
* This makes Firefox seem much more like Chrome to sites that
* expect a one-off, persistent permission grant for cam/mic.
*
* @param principal - Principal to add permission to.
* @param {string} permissionName - name of permission.
* @param remember - whether the grant should be persisted.
*/
function persistGrantOrPromptPermission(principal, permissionName, remember) {
// There are cases like unsafe delegation where a prompt appears
// even in ALLOW state, so make sure to not overwrite it (there's
// no remember checkbox in those cases)
if (
lazy.SitePermissions.getForPrincipal(principal, permissionName).state ==
lazy.SitePermissions.ALLOW
) {
return;
}
lazy.SitePermissions.setForPrincipal(
principal,
permissionName,
remember ? lazy.SitePermissions.ALLOW : lazy.SitePermissions.PROMPT
);
}
/**
* Clears any persisted PROMPT (aka Always Ask) permission.
* @param principal - Principal to remove permission from.
* @param {string} permissionName - name of permission.
* @param browser - Browser element to clear permission for.
*/
function maybeClearAlwaysAsk(principal, permissionName, browser) {
// For the "Always Ask" user choice, only persisted PROMPT is used,
// so no need to scan through temporary permissions.
if (
lazy.SitePermissions.getForPrincipal(principal, permissionName).state ==
lazy.SitePermissions.PROMPT
) {
lazy.SitePermissions.removeFromPrincipal(
principal,
permissionName,
browser
);
}
}
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2026-03-28
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