1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 * Functions related to the 'host screen' for Chromoting.
10 /** @suppress {duplicate} */
11 var remoting = remoting || {};
17 /** @type {remoting.HostSession} */
18 var hostSession_ = null;
21 * @type {boolean} Whether or not the last share was cancelled by the user.
22 * This controls what screen is shown when the host signals completion.
24 var lastShareWasCancelled_ = false;
27 * @type {remoting.LogToServer} Logging instance for IT2Me host connection
30 var it2meLogger = null;
33 * Start a host session. This is the main entry point for the host screen,
34 * called directly from the onclick action of a button on the home screen.
35 * It first verifies that the native host components are installed and asks
36 * to install them if necessary.
38 remoting.tryShare = function() {
39 ensureIT2MeLogger_().then(tryShareWithLogger_);
42 function tryShareWithLogger_() {
43 it2meLogger.setSessionId();
44 it2meLogger.logClientSessionStateChange(
45 remoting.ClientSession.State.INITIALIZING, remoting.Error.none(), null);
47 /** @type {remoting.It2MeHostFacade} */
48 var hostFacade = new remoting.It2MeHostFacade();
50 /** @type {remoting.HostInstallDialog} */
51 var hostInstallDialog = null;
53 var tryInitializeFacade = function() {
54 hostFacade.initialize(onFacadeInitialized, onFacadeInitializationFailed);
57 var onFacadeInitialized = function () {
58 // Host already installed.
59 remoting.startHostUsingFacade_(hostFacade);
62 var onFacadeInitializationFailed = function() {
63 // If we failed to initialize the dispatcher then prompt the user to install
65 var hasHostDialog = (hostInstallDialog !== null); /** jscompile hack */
67 hostInstallDialog = new remoting.HostInstallDialog();
68 hostInstallDialog.show(tryInitializeFacade, showShareError_);
70 hostInstallDialog.tryAgain();
74 tryInitializeFacade();
78 * @param {remoting.It2MeHostFacade} hostFacade An initialized It2MeHostFacade.
80 remoting.startHostUsingFacade_ = function(hostFacade) {
81 console.log('Attempting to share...');
83 .then(remoting.identity.getToken.bind(remoting.identity))
84 .then(remoting.tryShareWithToken_.bind(null, hostFacade),
85 remoting.Error.handler(showShareError_));
89 * @param {remoting.It2MeHostFacade} hostFacade An initialized
91 * @param {string} token The OAuth access token.
94 remoting.tryShareWithToken_ = function(hostFacade, token) {
95 lastShareWasCancelled_ = false;
96 onNatTraversalPolicyChanged_(true); // Hide warning by default.
97 remoting.setMode(remoting.AppMode.HOST_WAITING_FOR_CODE);
98 it2meLogger.logClientSessionStateChange(
99 remoting.ClientSession.State.CONNECTING, remoting.Error.none(), null);
100 document.getElementById('cancel-share-button').disabled = false;
101 disableTimeoutCountdown_();
103 console.assert(hostSession_ === null, '|hostSession_| already exists.');
104 hostSession_ = new remoting.HostSession();
105 remoting.identity.getEmail().then(
106 function(/** string */ email) {
107 hostSession_.connect(
108 hostFacade, email, token, onHostStateChanged_,
109 onNatTraversalPolicyChanged_, logDebugInfo_, it2meConnectFailed_);
114 * Callback for the host plugin to notify the web app of state changes.
115 * @param {remoting.HostSession.State} state The new state of the plugin.
116 * @return {void} Nothing.
118 function onHostStateChanged_(state) {
119 if (state == remoting.HostSession.State.STARTING) {
120 // Nothing to do here.
121 console.log('Host state: STARTING');
123 } else if (state == remoting.HostSession.State.REQUESTED_ACCESS_CODE) {
124 // Nothing to do here.
125 console.log('Host state: REQUESTED_ACCESS_CODE');
127 } else if (state == remoting.HostSession.State.RECEIVED_ACCESS_CODE) {
128 console.log('Host state: RECEIVED_ACCESS_CODE');
129 var accessCode = hostSession_.getAccessCode();
130 var accessCodeDisplay = document.getElementById('access-code-display');
131 accessCodeDisplay.innerText = '';
132 // Display the access code in groups of four digits for readability.
133 var kDigitsPerGroup = 4;
134 for (var i = 0; i < accessCode.length; i += kDigitsPerGroup) {
135 var nextFourDigits = document.createElement('span');
136 nextFourDigits.className = 'access-code-digit-group';
137 nextFourDigits.innerText = accessCode.substring(i, i + kDigitsPerGroup);
138 accessCodeDisplay.appendChild(nextFourDigits);
140 accessCodeExpiresIn_ = hostSession_.getAccessCodeLifetime();
141 if (accessCodeExpiresIn_ > 0) { // Check it hasn't expired.
142 accessCodeTimerId_ = setInterval(decrementAccessCodeTimeout_, 1000);
143 timerRunning_ = true;
144 updateAccessCodeTimeoutElement_();
145 updateTimeoutStyles_();
146 remoting.setMode(remoting.AppMode.HOST_WAITING_FOR_CONNECTION);
148 // This can only happen if the cloud tells us that the code lifetime is
149 // <= 0s, which shouldn't happen so we don't care how clean this UX is.
150 console.error('Access code already invalid on receipt!');
151 remoting.cancelShare();
154 } else if (state == remoting.HostSession.State.CONNECTED) {
155 console.log('Host state: CONNECTED');
156 var element = document.getElementById('host-shared-message');
157 var client = hostSession_.getClient();
158 l10n.localizeElement(element, client);
159 remoting.setMode(remoting.AppMode.HOST_SHARED);
160 disableTimeoutCountdown_();
162 } else if (state == remoting.HostSession.State.DISCONNECTING) {
163 console.log('Host state: DISCONNECTING');
165 } else if (state == remoting.HostSession.State.DISCONNECTED) {
166 console.log('Host state: DISCONNECTED');
167 if (remoting.currentMode != remoting.AppMode.HOST_SHARE_FAILED) {
168 // If an error is being displayed, then the plugin should not be able to
169 // hide it by setting the state. Errors must be dismissed by the user
170 // clicking OK, which puts the app into mode HOME.
171 if (lastShareWasCancelled_) {
172 remoting.setMode(remoting.AppMode.HOME);
174 remoting.setMode(remoting.AppMode.HOST_SHARE_FINISHED);
178 } else if (state == remoting.HostSession.State.ERROR) {
179 // The processing of this message is identical to that of the "error"
180 // message (see it2me_host_facade.js); it is included only to support
181 // old native components that send errors as a host state message.
182 // TODO(jamiewalch): Remove this once there are sufficiently few old
183 // installations deployed.
184 console.error('Host state: ERROR');
185 showShareError_(remoting.Error.unexpected());
186 } else if (state == remoting.HostSession.State.INVALID_DOMAIN_ERROR) {
187 console.error('Host state: INVALID_DOMAIN_ERROR');
188 showShareError_(new remoting.Error(remoting.Error.Tag.INVALID_HOST_DOMAIN));
190 console.error('Unknown state -> ' + state);
195 * This is the callback that the host plugin invokes to indicate that there
196 * is additional debug log info to display.
197 * @param {string} msg The message (which will not be localized) to be logged.
199 function logDebugInfo_(msg) {
200 console.log('plugin: ' + msg);
204 * Show a host-side error message.
206 * @param {!remoting.Error} error The error to be localized and displayed.
207 * @return {void} Nothing.
209 function showShareError_(error) {
210 if (error.hasTag(remoting.Error.Tag.CANCELLED)) {
211 remoting.setMode(remoting.AppMode.HOME);
212 it2meLogger.logClientSessionStateChange(
213 remoting.ClientSession.State.CONNECTION_CANCELED,
214 remoting.Error.none(),
217 var errorDiv = document.getElementById('host-plugin-error');
218 l10n.localizeElementFromTag(errorDiv, error.getTag());
219 console.error('Sharing error: ' + error.toString());
220 remoting.setMode(remoting.AppMode.HOST_SHARE_FAILED);
221 it2meLogger.logClientSessionStateChange(
222 remoting.ClientSession.State.FAILED, error, null);
229 * Show a sharing error with error code UNEXPECTED .
231 * @return {void} Nothing.
233 function it2meConnectFailed_() {
234 showShareError_(remoting.Error.unexpected());
238 base.dispose(hostSession_);
243 * Cancel an active or pending it2me share operation.
245 * @return {void} Nothing.
247 remoting.cancelShare = function() {
248 document.getElementById('cancel-share-button').disabled = true;
249 console.log('Canceling share...');
250 remoting.lastShareWasCancelled = true;
252 hostSession_.disconnect();
253 it2meLogger.logClientSessionStateChange(
254 remoting.ClientSession.State.CONNECTION_CANCELED,
255 remoting.Error.none(),
257 } catch (/** @type {*} */ error) {
258 console.error('Error disconnecting: ' + error +
259 '. The host probably crashed.');
260 // TODO(jamiewalch): Clean this up. We should have a class representing
261 // the host plugin, like we do for the client, which should handle crash
262 // reporting and it should use a more detailed error message than the
263 // default 'generic' one. See crbug.com/94624
264 showShareError_(remoting.Error.unexpected());
266 disableTimeoutCountdown_();
270 * @type {boolean} Whether or not the access code timeout countdown is running.
272 var timerRunning_ = false;
275 * @type {number} The id of the access code expiry countdown timer.
277 var accessCodeTimerId_ = 0;
280 * @type {number} The number of seconds until the access code expires.
282 var accessCodeExpiresIn_ = 0;
285 * The timer callback function
286 * @return {void} Nothing.
288 function decrementAccessCodeTimeout_() {
289 --accessCodeExpiresIn_;
290 updateAccessCodeTimeoutElement_();
294 * Stop the access code timeout countdown if it is running.
295 * @return {void} Nothing.
297 function disableTimeoutCountdown_() {
299 clearInterval(accessCodeTimerId_);
300 timerRunning_ = false;
301 updateTimeoutStyles_();
306 * Constants controlling the access code timer countdown display.
308 var ACCESS_CODE_TIMER_DISPLAY_THRESHOLD_ = 30;
309 var ACCESS_CODE_RED_THRESHOLD_ = 10;
312 * Show/hide or restyle various elements, depending on the remaining countdown
315 * @return {boolean} True if the timeout is in progress, false if it has
318 function updateTimeoutStyles_() {
320 if (accessCodeExpiresIn_ <= 0) {
321 remoting.cancelShare();
324 var accessCode = document.getElementById('access-code-display');
325 if (accessCodeExpiresIn_ <= ACCESS_CODE_RED_THRESHOLD_) {
326 accessCode.classList.add('expiring');
328 accessCode.classList.remove('expiring');
331 document.getElementById('access-code-countdown').hidden =
332 (accessCodeExpiresIn_ > ACCESS_CODE_TIMER_DISPLAY_THRESHOLD_) ||
338 * Update the text and appearance of the access code timeout element to
339 * reflect the time remaining.
340 * @return {void} Nothing.
342 function updateAccessCodeTimeoutElement_() {
343 var pad = (accessCodeExpiresIn_ < 10) ? '0:0' : '0:';
344 l10n.localizeElement(document.getElementById('seconds-remaining'),
345 pad + accessCodeExpiresIn_);
346 if (!updateTimeoutStyles_()) {
347 disableTimeoutCountdown_();
352 * Callback to show or hide the NAT traversal warning when the policy changes.
353 * @param {boolean} enabled True if NAT traversal is enabled.
354 * @return {void} Nothing.
356 function onNatTraversalPolicyChanged_(enabled) {
357 var natBox = document.getElementById('nat-box');
359 natBox.classList.add('traversal-enabled');
361 natBox.classList.remove('traversal-enabled');
366 * Create an IT2Me LogToServer instance if one does not already exist.
368 * @return {Promise} Promise that resolves when the host version (if available),
369 * has been set on the logger instance.
371 function ensureIT2MeLogger_() {
373 return Promise.resolve();
376 var xmppConnection = new remoting.XmppConnection();
377 var tokenPromise = remoting.identity.getToken();
378 var emailPromise = remoting.identity.getEmail();
379 tokenPromise.then(function(/** string */ token) {
380 emailPromise.then(function(/** string */ email) {
381 xmppConnection.connect(remoting.settings.XMPP_SERVER, email, token);
385 var bufferedSignalStrategy =
386 new remoting.BufferedSignalStrategy(xmppConnection);
387 it2meLogger = new remoting.LogToServer(bufferedSignalStrategy, true);
388 it2meLogger.setLogEntryMode(remoting.ChromotingEvent.Mode.IT2ME);
390 return setHostVersion_();
394 * @return {Promise} Promise that resolves when the host version (if available),
395 * has been set on the logger instance.
397 function setHostVersion_() {
398 return remoting.hostController.getLocalHostVersion().then(
399 function(/** string */ version) {
400 it2meLogger.setHostVersion(version);