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// Copyright 2007 The Closure Library 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.
/**
* @fileoverview Standalone script to be included in the relay-document
* used by goog.net.xpc.IframeRelayTransport. This script will decode the
* fragment identifier, determine the target window object and deliver
* the data to it.
*
*/
goog.provide('goog.net.xpc.relay');
(function() {
// Decode the fragement identifier.
// location.href is expected to be structured as follows:
// <url>#<channel_name>[,<iframe_id>]|<data>
// Get the fragment identifier.
var raw = window.location.hash;
if (!raw) {
return;
}
if (raw.charAt(0) == '#') {
raw = raw.substring(1);
}
var pos = raw.indexOf('|');
var head = raw.substring(0, pos).split(',');
var channelName = head[0];
var iframeId = head.length == 2 ? head[1] : null;
var frame = raw.substring(pos + 1);
// Find the window object of the peer.
//
// The general structure of the frames looks like this:
// - peer1
// - relay2
// - peer2
// - relay1
//
// We are either relay1 or relay2.
var win;
if (iframeId) {
// We are relay2 and need to deliver the data to peer2.
win = window.parent.frames[iframeId];
} else {
// We are relay1 and need to deliver the data to peer1.
win = window.parent.parent;
}
// Deliver the data.
try {
win['xpcRelay'](channelName, frame);
} catch (e) {
// Nothing useful can be done here.
// It would be great to inform the sender the delivery of this message
// failed, but this is not possible because we are already in the receiver's
// domain at this point.
}
})();
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