Deprecate API v2 (#7761)

* deprecate api-v2

* remove v2 test helpers

* remove unused string

website/server/libs/pusher.js

@@ -0,0 +1,42 @@
+import Pusher from 'pusher';
+import nconf from 'nconf';
+import { InternalServerError } from './errors';
+
+const IS_PUSHER_ENABLED = nconf.get('PUSHER:ENABLED') === 'true';
+
+let pusherInstance;
+
+if (IS_PUSHER_ENABLED) {
+  pusherInstance = new Pusher({
+    appId: nconf.get('PUSHER:APP_ID'),
+    key: nconf.get('PUSHER:KEY'),
+    secret: nconf.get('PUSHER:SECRET'),
+    encrypted: true,
+  });
+}
+
+let api = {
+  // https://github.com/pusher/pusher-http-node#publishing-events
+  trigger (channel, event, data, socketId = null) {
+    if (!IS_PUSHER_ENABLED) return Promise.resolve(null);
+
+    return new Promise((resolve, reject) => {
+      pusherInstance.trigger(channel, event, data, socketId, (err, req, res) => {
+        if (err) {
+          reject(err);
+        } else {
+          resolve([req, res]);
+        }
+      });
+    });
+  },
+
+  // https://github.com/pusher/pusher-http-node#authenticating-private-channels
+  authenticate (...args) {
+    if (!IS_PUSHER_ENABLED) throw new InternalServerError('Pusher is not enabled.');
+
+    return pusherInstance.authenticate(...args);
+  },
+};
+
+module.exports = api;