77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
// This file provides the external API for launching and talking to the sandboxed iframe.
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// The internal API is in sframe-channel.js
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define([
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'/common/requireconfig.js'
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], function (RequireConfig) {
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var iframe;
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var handlers = {};
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var queries = {};
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var module = { exports: {} };
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var mkTxid = function () {
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return Math.random().toString(16).replace('0.', '') + Math.random().toString(16).replace('0.', '');
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};
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module.exports.init = function (frame, cb) {
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if (iframe) { throw new Error('already initialized'); }
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var txid = mkTxid();
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var intr = setInterval(function () {
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frame.contentWindow.postMessage(JSON.stringify({
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txid: txid,
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content: { requireConf: RequireConfig },
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q: 'INIT'
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}), '*');
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});
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window.addEventListener('message', function (msg) {
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var data = JSON.parse(msg.data);
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if (!iframe) {
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if (data.txid !== txid) { return; }
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clearInterval(intr);
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iframe = frame;
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cb();
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} else if (typeof(data.q) === 'string' && handlers[data.q]) {
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handlers[data.q](data, msg);
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} else if (typeof(data.q) === 'undefined' && queries[data.txid]) {
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queries[data.txid](data, msg);
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} else {
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console.log("Unhandled message");
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console.log(msg);
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}
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});
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};
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module.exports.query = function (q, content, cb) {
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if (!iframe) { throw new Error('not yet initialized'); }
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var txid = mkTxid();
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var timeout = setTimeout(function () {
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delete queries[txid];
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cb("Timeout making query " + q);
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});
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queries[txid] = function (data, msg) {
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clearTimeout(timeout);
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delete queries[txid];
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cb(undefined, data.content, msg);
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};
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iframe.contentWindow.postMessage(JSON.stringify({
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txid: txid,
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content: content,
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q: q
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}), '*');
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};
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module.exports.registerHandler = function (queryType, handler) {
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if (typeof(handlers[queryType]) !== 'undefined') { throw new Error('already registered'); }
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handlers[queryType] = function (msg) {
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var data = JSON.parse(msg.data);
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handler(data.content, function (replyContent) {
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msg.source.postMessage(JSON.stringify({
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txid: data.txid,
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content: replyContent
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}), '*');
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}, msg);
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};
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};
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return module.exports;
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});
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