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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 WebView = require('webView').WebView;
/** @type {string} */
var REQUEST_TYPE_MEDIA = 'media';
/** @type {string} */
var ERROR_MSG_PERMISSION_ALREADY_DECIDED = '<webview>: ' +
'Permission has already been decided for this "permissionrequest" event.';
/**
* @param {!Object} detail The event details, originated from <object>.
* @private
*/
WebView.prototype.maybeSetupPermissionEvent_ = function() {
var node = this.node_;
var objectNode = this.objectNode_;
this.objectNode_.addEventListener('-internal-permissionrequest', function(e) {
var evt = new Event('permissionrequest', {bubbles: true, cancelable: true});
var detail = e.detail ? JSON.parse(e.detail) : {};
['permission', 'url'].forEach(function(attribName) {
evt[attribName] = detail[attribName];
});
var requestId = detail.requestId;
if (detail.permission == REQUEST_TYPE_MEDIA &&
detail.requestId !== undefined) {
// TODO(lazyboy): Also fill in evt.details (see webview specs).
// http://crbug.com/141197.
var decisionMade = false;
// Construct the event.request object.
var request = {
allow: function() {
if (decisionMade) {
throw new Error(ERROR_MSG_PERMISSION_ALREADY_DECIDED);
} else {
objectNode['-internal-setPermission'](requestId, true);
decisionMade = true;
}
},
deny: function() {
if (decisionMade) {
throw new Error(ERROR_MSG_PERMISSION_ALREADY_DECIDED);
} else {
objectNode['-internal-setPermission'](requestId, false);
decisionMade = true;
}
}
};
evt.request = request;
// Make browser plugin track lifetime of |request|.
objectNode['-internal-persistObject'](
request, REQUEST_TYPE_MEDIA, requestId);
var defaultPrevented = !node.dispatchEvent(evt);
if (!decisionMade && !defaultPrevented) {
decisionMade = true;
objectNode['-internal-setPermission'](requestId, false);
}
}
});
};
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