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viewer-impl.js
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viewer-impl.js
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/**
* Copyright 2015 The AMP HTML Authors. All Rights Reserved.
*
* 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.
*/
import {Observable} from '../observable';
import {findIndex} from '../utils/array';
import {dict, map} from '../utils/object';
import {Services} from '../services';
import {registerServiceBuilderForDoc} from '../service';
import {dev, duplicateErrorIfNecessary} from '../log';
import {isIframed} from '../dom';
import {
getSourceOrigin,
parseQueryString,
parseUrl,
removeFragment,
isProxyOrigin,
} from '../url';
import {reportError} from '../error';
import {VisibilityState} from '../visibility-state';
const TAG_ = 'Viewer';
const SENTINEL_ = '__AMP__';
/**
* Duration in milliseconds to wait for viewerOrigin to be set before an empty
* string is returned.
* @const
* @private {number}
*/
const VIEWER_ORIGIN_TIMEOUT_ = 1000;
/**
* These domains are trusted with more sensitive viewer operations such as
* propagating the referrer. If you believe your domain should be here,
* file the issue on GitHub to discuss. The process will be similar
* (but somewhat more stringent) to the one described in the [3p/README.md](
* https://github.com/ampproject/amphtml/blob/master/3p/README.md)
*
* @export {!Array<!RegExp>}
*/
const TRUSTED_VIEWER_HOSTS = [
/**
* Google domains, including country-codes and subdomains:
* - google.com
* - www.google.com
* - google.co
* - www.google.co
* - google.az
* - www.google.az
* - google.com.az
* - www.google.com.az
* - google.co.az
* - www.google.co.az
* - google.cat
* - www.google.cat
*/
/(^|\.)google\.(com?|[a-z]{2}|com?\.[a-z]{2}|cat)$/,
];
/**
* These domains are trusted with more sensitive viewer operations such as
* sending impression requests. If you believe your domain should be here,
* file the issue on GitHub to discuss. The process will be similar
* (but somewhat more stringent) to the one described in the [3p/README.md](
* https://github.com/ampproject/amphtml/blob/master/3p/README.md)
*
* @export {!Array<!RegExp>}
*/
const TRUSTED_REFERRER_HOSTS = [
/**
* Twitter's link wrapper domains:
* - t.co
*/
/^t.co$/,
];
/**
* @typedef {function(*):(!Promise<*>|undefined)}
*/
export let RequestResponder;
/**
* An AMP representation of the Viewer. This class doesn't do any work itself
* but instead delegates everything to the actual viewer. This class and the
* actual Viewer are connected via "AMP.viewer" using three methods:
* {@link getParam}, {@link receiveMessage} and {@link setMessageDeliverer}.
* @package Visible for type.
*/
export class Viewer {
/**
* @param {!./ampdoc-impl.AmpDoc} ampdoc
* @param {!Object<string, string>=} opt_initParams
*/
constructor(ampdoc, opt_initParams) {
/** @const {!./ampdoc-impl.AmpDoc} */
this.ampdoc = ampdoc;
/** @const {!Window} */
this.win = ampdoc.win;
/** @private @const {boolean} */
this.isIframed_ = isIframed(this.win);
/** @const {!./document-state.DocumentState} */
this.docState_ = Services.documentStateFor(this.win);
/** @private {boolean} */
this.isRuntimeOn_ = true;
/** @private {boolean} */
this.overtakeHistory_ = false;
/** @private {!VisibilityState} */
this.visibilityState_ = VisibilityState.VISIBLE;
/** @private {string} */
this.viewerVisibilityState_ = this.visibilityState_;
/** @private {number} */
this.prerenderSize_ = 1;
/** @private {!Object<string, !Observable<!JsonObject>>} */
this.messageObservables_ = map();
/** @private {!Object<string, !RequestResponder>} */
this.messageResponders_ = map();
/** @private {!Observable<boolean>} */
this.runtimeOnObservable_ = new Observable();
/** @private {!Observable} */
this.visibilityObservable_ = new Observable();
/** @private {!Observable<!JsonObject>} */
this.broadcastObservable_ = new Observable();
/**
* @private {?function(string, (?JsonObject|string|undefined), boolean):
* (Promise<*>|undefined)}
*/
this.messageDeliverer_ = null;
/** @private {?string} */
this.messagingOrigin_ = null;
/**
* @private {!Array<!{
* eventType: string,
* data: (?JsonObject|string|undefined),
* awaitResponse: boolean,
* responsePromise: (Promise<*>|undefined),
* responseResolver: function(*)
* }>}
*/
this.messageQueue_ = [];
/** @const @private {!Object<string, string>} */
this.params_ = {};
/** @private {?function()} */
this.whenFirstVisibleResolve_ = null;
/** @private {?Promise} */
this.nextVisiblePromise_ = null;
/** @private {?function()} */
this.nextVisibleResolve_ = null;
/** @private {?time} */
this.firstVisibleTime_ = null;
/** @private {?time} */
this.lastVisibleTime_ = null;
/** @private {?Function} */
this.messagingReadyResolver_ = null;
/** @private {?Function} */
this.viewerOriginResolver_ = null;
/** @private {?Function} */
this.trustedViewerResolver_ = null;
/**
* This promise might be resolved right away if the current
* document is already visible. See end of this constructor where we call
* `this.onVisibilityChange_()`.
* @private @const {!Promise}
*/
this.whenFirstVisiblePromise_ = new Promise(resolve => {
this.whenFirstVisibleResolve_ = resolve;
});
// Params can be passed either directly in multi-doc environment or via
// iframe hash/name with hash taking precedence.
if (opt_initParams) {
Object.assign(this.params_, opt_initParams);
} else {
if (this.win.name && this.win.name.indexOf(SENTINEL_) == 0) {
parseParams_(this.win.name.substring(SENTINEL_.length), this.params_);
}
if (this.win.location.hash) {
parseParams_(this.win.location.hash, this.params_);
}
}
dev().fine(TAG_, 'Viewer params:', this.params_);
this.isRuntimeOn_ = !parseInt(this.params_['off'], 10);
dev().fine(TAG_, '- runtimeOn:', this.isRuntimeOn_);
this.overtakeHistory_ = !!(parseInt(this.params_['history'], 10) ||
this.overtakeHistory_);
dev().fine(TAG_, '- history:', this.overtakeHistory_);
this.setVisibilityState_(this.params_['visibilityState']);
dev().fine(TAG_, '- visibilityState:', this.getVisibilityState());
this.prerenderSize_ = parseInt(this.params_['prerenderSize'], 10) ||
this.prerenderSize_;
dev().fine(TAG_, '- prerenderSize:', this.prerenderSize_);
/**
* Whether the AMP document is embedded in a webview.
* @private @const {boolean}
*/
this.isWebviewEmbedded_ = !this.isIframed_ &&
this.params_['webview'] == '1';
/**
* Whether the AMP document is embedded in a viewer, such as an iframe, or
* a web view, or a shadow doc in PWA.
* @private @const {boolean}
*/
this.isEmbedded_ = !!(
this.isIframed_ && !this.win.AMP_TEST_IFRAME
// Checking param "origin", as we expect all viewers to provide it.
// See https://github.com/ampproject/amphtml/issues/4183
// There appears to be a bug under investigation where the
// origin is sometimes failed to be detected. Since failure mode
// if we fail to initialize communication is very bad, we also check
// for visibilityState.
// After https://github.com/ampproject/amphtml/issues/6070
// is fixed we should probably only keep the amp_js_v check here.
&& (this.params_['origin']
|| this.params_['visibilityState']
// Parent asked for viewer JS. We must be embedded.
|| (this.win.location.search.indexOf('amp_js_v') != -1))
|| this.isWebviewEmbedded_
|| !ampdoc.isSingleDoc());
/** @private {boolean} */
this.hasBeenVisible_ = this.isVisible();
// Wait for document to become visible.
this.docState_.onVisibilityChanged(this.recheckVisibilityState_.bind(this));
/**
* This promise will resolve when communications channel has been
* established or timeout in 20 seconds. The timeout is needed to avoid
* this promise becoming a memory leak with accumulating undelivered
* messages. The promise is only available when the document is embedded.
* @private @const {?Promise}
*/
this.messagingReadyPromise_ = this.isEmbedded_ ?
Services.timerFor(this.win).timeoutPromise(
20000,
new Promise(resolve => {
this.messagingReadyResolver_ = resolve;
})).catch(reason => {
throw getChannelError(/** @type {!Error|string|undefined} */ (
reason));
}) : null;
/**
* A promise for non-essential messages. These messages should not fail
* if there's no messaging channel set up. But ideally viewer would try to
* deliver if at all possible. This promise is only available when the
* document is embedded.
* @private @const {?Promise}
*/
this.messagingMaybePromise_ = this.isEmbedded_ ?
this.messagingReadyPromise_
.catch(reason => {
// Don't fail promise, but still report.
reportError(getChannelError(
/** @type {!Error|string|undefined} */ (reason)));
}) : null;
// Trusted viewer and referrer.
let trustedViewerResolved;
let trustedViewerPromise;
if (!this.isEmbedded_) {
// Not embedded in IFrame - can't trust the viewer.
trustedViewerResolved = false;
trustedViewerPromise = Promise.resolve(false);
} else if (this.win.location.ancestorOrigins && !this.isWebviewEmbedded_) {
// Ancestors when available take precedence. This is the main API used
// for this determination. Fallback is only done when this API is not
// supported by the browser.
trustedViewerResolved = (this.win.location.ancestorOrigins.length > 0 &&
this.isTrustedViewerOrigin_(this.win.location.ancestorOrigins[0]));
trustedViewerPromise = Promise.resolve(trustedViewerResolved);
} else {
// Wait for comms channel to confirm the origin.
trustedViewerResolved = undefined;
trustedViewerPromise = new Promise(resolve => {
this.trustedViewerResolver_ = resolve;
});
}
/** @const @private {!Promise<boolean>} */
this.isTrustedViewer_ = trustedViewerPromise;
/** @const @private {!Promise<string>} */
this.viewerOrigin_ = new Promise(resolve => {
if (!this.isEmbedded()) {
// Viewer is only determined for iframed documents at this time.
resolve('');
} else if (this.win.location.ancestorOrigins &&
this.win.location.ancestorOrigins.length > 0) {
resolve(this.win.location.ancestorOrigins[0]);
} else {
// Race to resolve with a timer.
Services.timerFor(this.win).delay(
() => resolve(''), VIEWER_ORIGIN_TIMEOUT_);
this.viewerOriginResolver_ = resolve;
}
});
/** @private {string} */
this.unconfirmedReferrerUrl_ =
this.isEmbedded() && 'referrer' in this.params_ &&
trustedViewerResolved !== false ?
this.params_['referrer'] :
this.win.document.referrer;
/** @const @private {!Promise<string>} */
this.referrerUrl_ = new Promise(resolve => {
if (this.isEmbedded() && 'referrer' in this.params_) {
// Viewer override, but only for whitelisted viewers. Only allowed for
// iframed documents.
this.isTrustedViewer_.then(isTrusted => {
if (isTrusted) {
resolve(this.params_['referrer']);
} else {
resolve(this.win.document.referrer);
if (this.unconfirmedReferrerUrl_ != this.win.document.referrer) {
dev().expectedError(TAG_, 'Untrusted viewer referrer override: ' +
this.unconfirmedReferrerUrl_ + ' at ' +
this.messagingOrigin_);
this.unconfirmedReferrerUrl_ = this.win.document.referrer;
}
}
});
} else {
resolve(this.win.document.referrer);
}
});
/** @private {string} */
this.resolvedViewerUrl_ = removeFragment(this.win.location.href || '');
/** @const @private {!Promise<string>} */
this.viewerUrl_ = new Promise(resolve => {
/** @const {string} */
const viewerUrlOverride = this.params_['viewerUrl'];
if (this.isEmbedded() && viewerUrlOverride) {
// Viewer override, but only for whitelisted viewers. Only allowed for
// iframed documents.
this.isTrustedViewer_.then(isTrusted => {
if (isTrusted) {
this.resolvedViewerUrl_ = viewerUrlOverride;
} else {
dev().error(TAG_, 'Untrusted viewer url override: ' +
viewerUrlOverride + ' at ' +
this.messagingOrigin_);
}
resolve(this.resolvedViewerUrl_);
});
} else {
resolve(this.resolvedViewerUrl_);
}
});
// Remove hash when we have an incoming click tracking string
// (see impression.js).
if (this.params_['click']) {
const newUrl = removeFragment(this.win.location.href);
if (newUrl != this.win.location.href && this.win.history.replaceState) {
// Persist the hash that we removed has location.originalHash.
// This is currently used my mode.js to infer development mode.
if (!this.win.location.originalHash) {
this.win.location.originalHash = this.win.location.hash;
}
this.win.history.replaceState({}, '', newUrl);
dev().fine(TAG_, 'replace fragment:' + this.win.location.href);
}
}
// Check if by the time the `Viewer`
// instance is constructed, the document is already `visible`.
this.recheckVisibilityState_();
this.onVisibilityChange_();
}
/**
* Handler for visibility change.
* @private
*/
onVisibilityChange_() {
if (this.isVisible()) {
const now = Date.now();
if (!this.firstVisibleTime_) {
this.firstVisibleTime_ = now;
}
this.lastVisibleTime_ = now;
this.hasBeenVisible_ = true;
this.whenFirstVisibleResolve_();
this.whenNextVisibleResolve_();
}
this.visibilityObservable_.fire();
}
/**
* Returns the value of a viewer's startup parameter with the specified
* name or "undefined" if the parameter wasn't defined at startup time.
* @param {string} name
* @return {string|undefined}
* @export
*/
getParam(name) {
return this.params_[name];
}
/**
* Viewers can communicate their "capabilities" and this method allows
* checking them.
* @param {string} name Of the capability.
* @return {boolean}
*/
hasCapability(name) {
const capabilities = this.params_['cap'];
if (!capabilities) {
return false;
}
// TODO(@cramforce): Consider caching the split.
return capabilities.split(',').indexOf(name) != -1;
}
/**
* Requests A2A navigation to the given destination. If the viewer does
* not support this operation, will navigate the top level window
* to the destination.
* The URL is assumed to be in AMP Cache format already.
* @param {string} url An AMP article URL.
* @param {string} requestedBy Informational string about the entity that
* requested the navigation.
*/
navigateTo(url, requestedBy) {
dev().assert(isProxyOrigin(url), 'Invalid A2A URL %s %s', url, requestedBy);
if (this.hasCapability('a2a')) {
this.sendMessage('a2a', dict({
'url': url,
'requestedBy': requestedBy,
}));
} else {
this.win.top.location.href = url;
}
}
/**
* Whether the document is embedded in a viewer.
* @return {boolean}
*/
isEmbedded() {
return this.isEmbedded_;
}
/**
* Whether the document is embedded in a webview.
* @return {boolean}
*/
isWebviewEmbedded() {
return this.isWebviewEmbedded_;
}
/**
* @return {boolean}
*/
isRuntimeOn() {
return this.isRuntimeOn_;
}
/**
*/
toggleRuntime() {
this.isRuntimeOn_ = !this.isRuntimeOn_;
dev().fine(TAG_, 'Runtime state:', this.isRuntimeOn_);
this.runtimeOnObservable_.fire(this.isRuntimeOn_);
}
/**
* @param {function(boolean)} handler
* @return {!UnlistenDef}
*/
onRuntimeState(handler) {
return this.runtimeOnObservable_.add(handler);
}
/**
* Whether the viewer overtakes the history for AMP document. If yes,
* the viewer must implement history messages "pushHistory" and "popHistory"
* and emit message "historyPopped"
* @return {boolean}
*/
isOvertakeHistory() {
return this.overtakeHistory_;
}
/**
* Returns visibility state configured by the viewer.
* See {@link isVisible}.
* @return {!VisibilityState}
* TODO(dvoytenko, #5285): Move public API to AmpDoc.
*/
getVisibilityState() {
return this.visibilityState_;
}
/** @private */
recheckVisibilityState_() {
this.setVisibilityState_(this.viewerVisibilityState_);
}
/**
* Sets the viewer defined visibility state.
* @param {string|undefined} state
* @private
*/
setVisibilityState_(state) {
if (!state) {
return;
}
const oldState = this.visibilityState_;
state = dev().assertEnumValue(VisibilityState, state, 'VisibilityState');
// The viewer is informing us we are not currently active because we are
// being pre-rendered, or the user swiped to another doc (or closed the
// viewer). Unfortunately, the viewer sends HIDDEN instead of PRERENDER or
// INACTIVE, though we know better.
if (state === VisibilityState.HIDDEN) {
state = this.hasBeenVisible_ ?
VisibilityState.INACTIVE :
VisibilityState.PRERENDER;
}
this.viewerVisibilityState_ = state;
if (this.docState_.isHidden() &&
(state === VisibilityState.VISIBLE ||
state === VisibilityState.PAUSED)) {
state = VisibilityState.HIDDEN;
}
this.visibilityState_ = state;
dev().fine(TAG_, 'visibilitychange event:', this.getVisibilityState());
if (oldState !== state) {
this.onVisibilityChange_();
}
}
/**
* Whether the AMP document currently visible. The reasons why it might not
* be visible include user switching to another tab, browser running the
* document in the prerender mode or viewer running the document in the
* prerender mode.
* @return {boolean}
*/
isVisible() {
return this.getVisibilityState() == VisibilityState.VISIBLE;
}
/**
* Whether the AMP document has been ever visible before. Since the visiblity
* state of a document can be flipped back and forth we sometimes want to know
* if a document has ever been visible.
* @return {boolean}
*/
hasBeenVisible() {
return this.hasBeenVisible_;
}
/**
* Returns a Promise that only ever resolved when the current
* AMP document first becomes visible.
* @return {!Promise}
*/
whenFirstVisible() {
return this.whenFirstVisiblePromise_;
}
/**
* Returns a Promise that resolve when current doc becomes visible.
* The promise resolves immediately if doc is already visible.
* @return {!Promise}
*/
whenNextVisible() {
if (this.isVisible()) {
return Promise.resolve();
}
if (this.nextVisiblePromise_) {
return this.nextVisiblePromise_;
}
return this.nextVisiblePromise_ = new Promise(resolve => {
this.nextVisibleResolve_ = resolve;
});
}
/**
* Helper method to be called on visiblity change
* @private
*/
whenNextVisibleResolve_() {
if (this.nextVisibleResolve_) {
this.nextVisibleResolve_();
this.nextVisibleResolve_ = null;
this.nextVisiblePromise_ = null;
}
}
/**
* Returns the time when the document has become visible for the first time.
* If document has not yet become visible, the returned value is `null`.
* @return {?time}
*/
getFirstVisibleTime() {
return this.firstVisibleTime_;
}
/**
* Returns the time when the document has become visible for the last time.
* If document has not yet become visible, the returned value is `null`.
* @return {?time}
*/
getLastVisibleTime() {
return this.lastVisibleTime_;
}
/**
* How much the viewer has requested the runtime to prerender the document.
* The values are in number of screens.
* @return {number}
*/
getPrerenderSize() {
return this.prerenderSize_;
}
/**
* Returns the resolved viewer URL value. It's by default the current page's
* URL. The trusted viewers are allowed to override this value.
* @return {string}
*/
getResolvedViewerUrl() {
return this.resolvedViewerUrl_;
}
/**
* Returns the promise that will yield the viewer URL value. It's by default
* the current page's URL. The trusted viewers are allowed to override this
* value.
* @return {!Promise<string>}
*/
getViewerUrl() {
return this.viewerUrl_;
}
/**
* Possibly return the messaging origin if set. This would be the origin
* of the parent viewer.
* @return {?string}
*/
maybeGetMessagingOrigin() {
return this.messagingOrigin_;
}
/**
* @param {string} referrer
* @return {boolean}
* @private
*/
isTrustedReferrer_(referrer) {
const url = parseUrl(referrer);
if (url.protocol != 'https:') {
return false;
}
return TRUSTED_REFERRER_HOSTS.some(th => th.test(url.hostname));
}
/**
* Returns an unconfirmed "referrer" URL that can be optionally customized by
* the viewer. Consider using `getReferrerUrl()` instead, which returns the
* promise that will yield the confirmed "referrer" URL.
* @return {string}
*/
getUnconfirmedReferrerUrl() {
return this.unconfirmedReferrerUrl_;
}
/**
* Returns the promise that will yield the confirmed "referrer" URL. This
* URL can be optionally customized by the viewer, but viewer is required
* to be a trusted viewer.
* @return {!Promise<string>}
*/
getReferrerUrl() {
return this.referrerUrl_;
}
/**
* Whether the viewer has been whitelisted for more sensitive operations
* such as customizing referrer.
* @return {!Promise<boolean>}
*/
isTrustedViewer() {
return this.isTrustedViewer_;
}
/**
* Whether the referrer has been whitelisted for CORS impression
* @return {!Promise<boolean>}
*/
isTrustedReferrer() {
return this.referrerUrl_.then(referrer => {
return this.isTrustedReferrer_(referrer);
});
}
/**
* Returns the promise that resolves to URL representing the origin of the
* viewer. If the document is not embedded or if a viewer origin can't be
* found, empty string is returned.
* @return {!Promise<string>}
*/
getViewerOrigin() {
return this.viewerOrigin_;
}
/**
* @param {string} urlString
* @return {boolean}
* @private
*/
isTrustedViewerOrigin_(urlString) {
// TEMPORARY HACK due to a misbehaving native app. See b/32626673
// In native apps all security bets are off anyway, and in browser
// origins never take the form that is matched here.
if (this.isWebviewEmbedded_ && /^www\.[.a-z]+$/.test(urlString)) {
return TRUSTED_VIEWER_HOSTS.some(th => th.test(urlString));
}
/** @const {!Location} */
const url = parseUrl(urlString);
if (url.protocol != 'https:') {
// Non-https origins are never trusted.
return false;
}
return TRUSTED_VIEWER_HOSTS.some(th => th.test(url.hostname));
}
/**
* Adds a "visibilitychange" event listener for viewer events. The
* callback can check {@link isVisible} and {@link getPrefetchCount}
* methods for more info.
* @param {function()} handler
* @return {!UnlistenDef}
*/
onVisibilityChanged(handler) {
return this.visibilityObservable_.add(handler);
}
/**
* Adds a eventType listener for viewer events.
* @param {string} eventType
* @param {function(!JsonObject)} handler
* @return {!UnlistenDef}
*/
onMessage(eventType, handler) {
let observable = this.messageObservables_[eventType];
if (!observable) {
observable = new Observable();
this.messageObservables_[eventType] = observable;
}
return observable.add(handler);
}
/**
* Adds a eventType listener for viewer events.
* @param {string} eventType
* @param {!RequestResponder} responder
* @return {!UnlistenDef}
*/
onMessageRespond(eventType, responder) {
this.messageResponders_[eventType] = responder;
return () => {
if (this.messageResponders_[eventType] === responder) {
delete this.messageResponders_[eventType];
}
};
}
/**
* Requests AMP document to receive a message from Viewer.
* @param {string} eventType
* @param {!JsonObject} data
* @param {boolean} unusedAwaitResponse
* @return {(!Promise<*>|undefined)}
* @export
*/
receiveMessage(eventType, data, unusedAwaitResponse) {
if (eventType == 'visibilitychange') {
if (data['prerenderSize'] !== undefined) {
this.prerenderSize_ = data['prerenderSize'];
dev().fine(TAG_, '- prerenderSize change:', this.prerenderSize_);
}
this.setVisibilityState_(data['state']);
return Promise.resolve();
}
if (eventType == 'broadcast') {
this.broadcastObservable_.fire(
/** @type {!JsonObject|undefined} */ (data));
return Promise.resolve();
}
const observable = this.messageObservables_[eventType];
if (observable) {
observable.fire(data);
}
const responder = this.messageResponders_[eventType];
if (responder) {
return responder(data);
} else if (observable) {
return Promise.resolve();
}
dev().fine(TAG_, 'unknown message:', eventType);
return undefined;
}
/**
* Provides a message delivery mechanism by which AMP document can send
* messages to the viewer.
* @param {function(string, (?JsonObject|string|undefined), boolean):
* (!Promise<*>|undefined)} deliverer
* @param {string} origin
* @export
*/
setMessageDeliverer(deliverer, origin) {
if (this.messageDeliverer_) {
throw new Error('message channel can only be initialized once');
}
if (origin == null) {
throw new Error('message channel must have an origin');
}
dev().fine(TAG_, 'message channel established with origin: ', origin);
this.messageDeliverer_ = deliverer;
this.messagingOrigin_ = origin;
if (this.messagingReadyResolver_) {
this.messagingReadyResolver_();
}
if (this.trustedViewerResolver_) {
this.trustedViewerResolver_(
origin ? this.isTrustedViewerOrigin_(origin) : false);
}
if (this.viewerOriginResolver_) {
this.viewerOriginResolver_(origin || '');
}
if (this.messageQueue_.length > 0) {
const queue = this.messageQueue_.slice(0);
this.messageQueue_ = [];
queue.forEach(message => {
const responsePromise = this.messageDeliverer_(
message.eventType,
message.data,
message.awaitResponse);
if (message.awaitResponse) {
message.responseResolver(responsePromise);
}
});
}
}
/**
* Sends the message to the viewer without waiting for any response.
* If cancelUnsent is true, the previous message of the same message type will
* be canceled.
*
* This is a restricted API.
*
* @param {string} eventType
* @param {?JsonObject|string|undefined} data
* @param {boolean=} cancelUnsent
*/
sendMessage(eventType, data, cancelUnsent = false) {
this.sendMessageInternal_(eventType, data, cancelUnsent, false);
}
/**
* Sends the message to the viewer and wait for response.
* If cancelUnsent is true, the previous message of the same message type will
* be canceled.
*
* This is a restricted API.
*
* @param {string} eventType
* @param {?JsonObject|string|undefined} data
* @param {boolean=} cancelUnsent
* @return {!Promise<(?JsonObject|string|undefined)>} the response promise
*/
sendMessageAwaitResponse(eventType, data, cancelUnsent = false) {
return this.sendMessageInternal_(eventType, data, cancelUnsent, true);
}
/**
* Sends the message to the viewer.
*
* @param {string} eventType
* @param {?JsonObject|string|undefined} data
* @param {boolean} cancelUnsent
* @param {boolean} awaitResponse
* @return {!Promise<(?JsonObject|string|undefined)>} the response promise
*/
sendMessageInternal_(eventType, data, cancelUnsent, awaitResponse) {
if (this.messageDeliverer_) {
// Certain message deliverers return fake "Promise" instances called
// "Thenables". Convert from these values into trusted Promise instances,
// assimilating with the resolved (or rejected) internal value.
return /** @type {!Promise<?JsonObject|string|undefined>} */ (
Promise.resolve(this.messageDeliverer_(
eventType,
/** @type {?JsonObject|string|undefined} */ (data),
awaitResponse)));
}
if (!this.messagingReadyPromise_) {
if (awaitResponse) {
return Promise.reject(getChannelError());
} else {
return Promise.resolve();
}
}
if (!cancelUnsent) {
return this.messagingReadyPromise_.then(() => {
return this.messageDeliverer_(eventType, data, awaitResponse);
});
}
const found = findIndex(this.messageQueue_,
m => m.eventType == eventType);
let message;
if (found != -1) {
message = this.messageQueue_.splice(found, 1)[0];
message.data = data;
message.awaitResponse = message.awaitResponse || awaitResponse;
} else {
let responseResolver;
const responsePromise = new Promise(r => {
responseResolver = r;
});
message = {
eventType,
data,
awaitResponse,
responsePromise,
responseResolver,
};
}
this.messageQueue_.push(message);
return message.responsePromise;
}