wip

www/common/sframe-channel.js

@@ -0,0 +1,46 @@
+// This file provides the internal API for talking from inside of the sandbox iframe
+// The external API is in sframe-ctrl.js
+define([], function () {
+    var iframe;
+    var handlers = {};
+    var queries = {};
+    var module = { exports: {} };
+
+    var mkTxid = function () {
+        return Math.random().toString(16).replace('0.', '') + Math.random().toString(16).replace('0.', '');
+    };
+
+    module.exports.query = function (q, content, cb) {
+        if (!iframe) { throw new Error('not yet initialized'); }
+        var txid = mkTxid();
+        var timeout = setTimeout(function () {
+            delete queries[txid];
+            cb("Timeout making query " + q);
+        });
+        queries[txid] = function (data, msg) {
+            clearTimeout(timeout);
+            delete queries[txid];
+            cb(undefined, data.content, msg);
+        };
+        iframe.contentWindow.postMessage(JSON.stringify({
+            txid: txid,
+            content: content,
+            q: q
+        }), '*');
+    };
+
+    module.exports.registerHandler = function (queryType, handler) {
+        if (typeof(handlers[queryType]) !== 'undefined') { throw new Error('already registered'); }
+        handlers[queryType] = function (msg) {
+            var data = JSON.parse(msg.data);
+            handler(data.content, function (replyContent) {
+                msg.source.postMessage(JSON.stringify({
+                    txid: data.txid,
+                    content: replyContent
+                }), '*');
+            }, msg);
+        };
+    };
+
+    return module.exports;
+});