Initial sioconfig migration work

src/configuration/ioconfig.js

@@ -0,0 +1,23 @@
+export default class IOConfiguration {
+    constructor(config) {
+        this.config = config;
+    }
+
+    getSocketURL() {
+        return this.config.urls[0];
+    }
+}
+
+IOConfiguration.fromOldConfig = function (oldConfig) {
+    const config = {
+        urls: []
+    };
+
+    ['ipv4-ssl', 'ipv4-nossl', 'ipv6-ssl', 'ipv6-nossl'].forEach(key => {
+        if (oldConfig.get('io.' + key)) {
+            config.urls.push(oldConfig.get('io.' + key));
+        }
+    });
+
+    return new IOConfiguration(config);
+};

src/io/cluster/nullclusterclient.js

@@ -0,0 +1,11 @@
+import Promise from 'bluebird';
+
+export default class NullClusterClient {
+    constructor(ioConfig) {
+        this.ioConfig = ioConfig;
+    }
+
+    getSocketURL(channel) {
+        return Promise.resolve(this.ioConfig.getSocketURL());
+    }
+}

src/web/routes/socketconfig.js

@@ -0,0 +1,24 @@
+import IOConfiguration from '../../configuration/ioconfig';
+import NullClusterClient from '../../io/cluster/nullclusterclient';
+import Config from '../../config';
+import CyTubeUtil from '../../utilities';
+
+export default function initialize(app) {
+    const ioConfig = IOConfiguration.fromOldConfig(Config);
+    const clusterClient = new NullClusterClient(ioConfig);
+
+    app.get('/socketconfig/:channel.json', (req, res) => {
+        if (!req.params.channel || !CyTubeUtil.isValidChannelName(req.params.channel)) {
+            return res.status(400).json({
+                error: `Channel "${req.params.channel}" does not exist.`
+            });
+        }
+
+        clusterClient.getSocketURL(req.params.channel).then(url => {
+            res.json({
+                url,
+                secure: /^(https|wss)/.test(url)
+            });
+        });
+    });
+}

src/web/webserver.js

@@ -117,7 +117,8 @@ function handleIndex(req, res) {
 }
 
 /**
- * Handles a request for the socket.io information
+ * Legacy socket.io configuration endpoint.  This is being migrated to
+ * /socketconfig/<channel name>.json (see ./routes/socketconfig.js)
  */
 function handleSocketConfig(req, res) {
     if (/\.json$/.test(req.path)) {
@@ -243,6 +244,7 @@ module.exports = {
         app.get("/r/:channel", handleChannel);
         app.get("/", handleIndex);
         app.get("/sioconfig(.json)?", handleSocketConfig);
+        require("./routes/socketconfig")(app);
         app.get("/useragreement", handleUserAgreement);
         app.get("/contact", handleContactPage);
         require("./auth").init(app);