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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Shim extension to provide permission request API (and possibly other future
// experimental APIs) for <webview> tag.
// See web_view.js for details.
//
// We want to control the permission API feature in <webview> separately from
// the <webview> feature itself. <webview> is available in stable channel, but
// permission API would only be available for channels CHANNEL_DEV and
// CHANNEL_CANARY.
var CreateEvent = require('webView').CreateEvent;
var MessagingNatives = requireNative('messaging_natives');
var WebViewInternal = require('webView').WebViewInternal;
var WebView = require('webView').WebView;
var WEB_VIEW_EXPERIMENTAL_EVENTS = {
'dialog': {
cancelable: true,
customHandler: function(webViewInternal, event, webViewEvent) {
webViewInternal.handleDialogEvent_(event, webViewEvent);
},
evt: CreateEvent('webview.onDialog'),
fields: ['defaultPromptText', 'messageText', 'messageType', 'url']
}
};
/**
* @private
*/
WebViewInternal.prototype.maybeAttachWebRequestEventToObject_ =
function(obj, eventName, webRequestEvent) {
Object.defineProperty(
obj,
eventName,
{
get: webRequestEvent,
enumerable: true
}
);
};
/**
* @private
*/
WebViewInternal.prototype.handleDialogEvent_ =
function(event, webViewEvent) {
var showWarningMessage = function(dialogType) {
var VOWELS = ['a', 'e', 'i', 'o', 'u'];
var WARNING_MSG_DIALOG_BLOCKED = '<webview>: %1 %2 dialog was blocked.';
var article = (VOWELS.indexOf(dialogType.charAt(0)) >= 0) ? 'An' : 'A';
var output = WARNING_MSG_DIALOG_BLOCKED.replace('%1', article);
output = output.replace('%2', dialogType);
window.console.warn(output);
};
var self = this;
var browserPluginNode = this.browserPluginNode_;
var webviewNode = this.webviewNode_;
var requestId = event.requestId;
var actionTaken = false;
var validateCall = function() {
var ERROR_MSG_DIALOG_ACTION_ALREADY_TAKEN = '<webview>: ' +
'An action has already been taken for this "dialog" event.';
if (actionTaken) {
throw new Error(ERROR_MSG_DIALOG_ACTION_ALREADY_TAKEN);
}
actionTaken = true;
};
var dialog = {
ok: function(user_input) {
validateCall();
user_input = user_input || '';
WebView.setPermission(self.instanceId_, requestId, 'allow', user_input);
},
cancel: function() {
validateCall();
WebView.setPermission(self.instanceId_, requestId, 'deny');
}
};
webViewEvent.dialog = dialog;
var defaultPrevented = !webviewNode.dispatchEvent(webViewEvent);
if (actionTaken) {
return;
}
if (defaultPrevented) {
// Tell the JavaScript garbage collector to track lifetime of |dialog| and
// call back when the dialog object has been collected.
MessagingNatives.BindToGC(dialog, function() {
// Avoid showing a warning message if the decision has already been made.
if (actionTaken) {
return;
}
WebView.setPermission(
self.instanceId_, requestId, 'default', '', function(allowed) {
if (allowed) {
return;
}
showWarningMessage(event.messageType);
});
});
} else {
actionTaken = true;
// The default action is equivalent to canceling the dialog.
WebView.setPermission(
self.instanceId_, requestId, 'default', '', function(allowed) {
if (allowed) {
return;
}
showWarningMessage(event.messageType);
});
}
};
/** @private */
WebViewInternal.prototype.maybeGetExperimentalEvents_ = function() {
return WEB_VIEW_EXPERIMENTAL_EVENTS;
};
WebViewInternal.prototype.maybeGetExperimentalPermissions_ = function() {
return [];
};
/** @private */
WebViewInternal.prototype.clearData_ = function(var_args) {
if (!this.instanceId_) {
return;
}
var args = $Array.concat([this.instanceId_], $Array.slice(arguments));
$Function.apply(WebView.clearData, null, args);
};
/** @private */
WebViewInternal.prototype.getUserAgent_ = function() {
return this.userAgentOverride_ || navigator.userAgent;
};
/** @private */
WebViewInternal.prototype.isUserAgentOverridden_ = function() {
return !!this.userAgentOverride_ &&
this.userAgentOverride_ != navigator.userAgent;
};
/** @private */
WebViewInternal.prototype.setUserAgentOverride_ = function(userAgentOverride) {
this.userAgentOverride_ = userAgentOverride;
if (!this.instanceId_) {
// If we are not attached yet, then we will pick up the user agent on
// attachment.
return;
}
WebView.overrideUserAgent(this.instanceId_, userAgentOverride);
};
/** @private */
WebViewInternal.prototype.captureVisibleRegion_ = function(spec, callback) {
WebView.captureVisibleRegion(this.instanceId_, spec, callback);
};
WebViewInternal.maybeRegisterExperimentalAPIs = function(proto, secret) {
proto.clearData = function(var_args) {
var internal = this.internal_(secret);
$Function.apply(internal.clearData_, internal, arguments);
};
proto.getUserAgent = function() {
return this.internal_(secret).getUserAgent_();
};
proto.isUserAgentOverridden = function() {
return this.internal_(secret).isUserAgentOverridden_();
};
proto.setUserAgentOverride = function(userAgentOverride) {
this.internal_(secret).setUserAgentOverride_(userAgentOverride);
};
proto.captureVisibleRegion = function(spec, callback) {
this.internal_(secret).captureVisibleRegion_(spec, callback);
};
};
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