2013-07-10 02:45:36 +02:00
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<html>
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<head>
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<script src="http://apprtc.appspot.com/_ah/channel/jsapi"></script>
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</head>
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<!--
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Helper HTML that redirects Google AppEngine's Channel API to Objective C.
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This is done by hosting this page in an iOS application. The hosting
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class creates a UIWebView control and implements the UIWebViewDelegate
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2014-03-31 22:16:49 +02:00
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protocol. Then when there is a channel message it is queued in JS,
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and an IFRAME is added to the DOM, triggering a navigation event
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|shouldStartLoadWithRequest| in Objective C which can then fetch the
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message using |popQueuedMessage|. This queuing is necessary to avoid URL
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length limits in UIWebView (which are undocumented).
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2013-07-10 02:45:36 +02:00
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-->
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<body onbeforeunload="closeSocket()" onload="openSocket()">
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<script type="text/javascript">
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// QueryString is copy/pasta from
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// chromium's chrome/test/data/media/html/utils.js.
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var QueryString = function () {
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// Allows access to query parameters on the URL; e.g., given a URL like:
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// http://<url>/my.html?test=123&bob=123
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// parameters can now be accessed via QueryString.test or
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// QueryString.bob.
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var params = {};
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// RegEx to split out values by &.
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var r = /([^&=]+)=?([^&]*)/g;
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// Lambda function for decoding extracted match values. Replaces '+'
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// with space so decodeURIComponent functions properly.
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function d(s) { return decodeURIComponent(s.replace(/\+/g, ' ')); }
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var match;
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while (match = r.exec(window.location.search.substring(1)))
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params[d(match[1])] = d(match[2]);
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return params;
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} ();
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var channel = null;
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var socket = null;
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2014-03-31 22:16:49 +02:00
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// In-order queue of messages to be delivered to ObjectiveC.
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// Each is a JSON.stringify()'d dictionary containing a 'type'
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// field and optionally a 'payload'.
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var messageQueue = [];
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2013-07-10 02:45:36 +02:00
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function openSocket() {
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if (!QueryString.token || !QueryString.token.match(/^[A-z0-9_-]+$/)) {
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// Send error back to ObjC. This will assert in GAEChannelClient.m.
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sendMessageToObjC("JSError:Missing/malformed token parameter " +
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QueryString.token);
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throw "Missing/malformed token parameter: " + QueryString.token;
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}
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channel = new goog.appengine.Channel(QueryString.token);
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socket = channel.open({
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'onopen': function() {
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sendMessageToObjC("onopen");
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},
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'onmessage': function(msg) {
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2014-03-31 22:16:49 +02:00
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sendMessageToObjC("onmessage", msg);
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2013-07-10 02:45:36 +02:00
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},
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'onclose': function() {
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sendMessageToObjC("onclose");
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},
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'onerror': function(err) {
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2014-03-31 22:16:49 +02:00
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sendMessageToObjC("onerror", err);
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2013-07-10 02:45:36 +02:00
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}
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});
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}
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function closeSocket() {
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socket.close();
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}
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// Add an IFRAME to the DOM to trigger a navigation event. Then remove
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// it as it is no longer needed. Only one event is generated.
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2014-03-31 22:16:49 +02:00
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function sendMessageToObjC(type, payload) {
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messageQueue.push(JSON.stringify({'type': type, 'payload': payload}));
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2013-07-10 02:45:36 +02:00
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var iframe = document.createElement("IFRAME");
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2014-03-31 22:16:49 +02:00
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iframe.setAttribute("src", "js-frame:");
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2013-07-10 02:45:36 +02:00
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// For some reason we need to set a non-empty size for the iOS6
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// simulator...
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iframe.setAttribute("height", "1px");
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iframe.setAttribute("width", "1px");
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document.documentElement.appendChild(iframe);
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iframe.parentNode.removeChild(iframe);
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}
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2014-03-31 22:16:49 +02:00
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function popQueuedMessage() {
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return messageQueue.shift();
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}
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2013-07-10 02:45:36 +02:00
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</script>
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</body>
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</html>
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