73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
// Copyright 2007 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Standalone script to be included in the relay-document
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* used by goog.net.xpc.IframeRelayTransport. This script will decode the
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* fragment identifier, determine the target window object and deliver
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* the data to it.
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*
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*/
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goog.provide('goog.net.xpc.relay');
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(function() {
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// Decode the fragement identifier.
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// location.href is expected to be structured as follows:
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// <url>#<channel_name>[,<iframe_id>]|<data>
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// Get the fragment identifier.
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var raw = window.location.hash;
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if (!raw) {
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return;
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}
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if (raw.charAt(0) == '#') {
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raw = raw.substring(1);
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}
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var pos = raw.indexOf('|');
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var head = raw.substring(0, pos).split(',');
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var channelName = head[0];
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var iframeId = head.length == 2 ? head[1] : null;
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var frame = raw.substring(pos + 1);
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// Find the window object of the peer.
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//
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// The general structure of the frames looks like this:
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// - peer1
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// - relay2
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// - peer2
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// - relay1
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//
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// We are either relay1 or relay2.
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var win;
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if (iframeId) {
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// We are relay2 and need to deliver the data to peer2.
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win = window.parent.frames[iframeId];
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} else {
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// We are relay1 and need to deliver the data to peer1.
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win = window.parent.parent;
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}
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// Deliver the data.
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try {
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win['xpcRelay'](channelName, frame);
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} catch (e) {
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// Nothing useful can be done here.
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// It would be great to inform the sender the delivery of this message
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// failed, but this is not possible because we are already in the receiver's
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// domain at this point.
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}
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})();
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