From c7ad9bfdad0bb6c202081c0ce8041f0532513d42 Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Tue, 27 Sep 2016 19:38:10 +0100
Subject: [PATCH] Add 'getHomeServerName' util to client peg

---
 src/MatrixClientPeg.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/MatrixClientPeg.js b/src/MatrixClientPeg.js
index 98b698ca3e..94b6931478 100644
--- a/src/MatrixClientPeg.js
+++ b/src/MatrixClientPeg.js
@@ -85,6 +85,19 @@ class MatrixClientPeg {
         };
     }
 
+    /**
+     * Return the server name of the user's home server
+     * Throws an error if unable to deduce the home server name
+     * (eg. if the user is not logged in)
+     */
+    getHomeServerName() {
+        const matches = /^@.+:(.+)$/.exec(this.matrixClient.credentials.userId);
+        if (matches === null || matches.length < 1) {
+            throw new Error("Failed to derive home server name fro user ID!");
+        }
+        return matches[1];
+    }
+
     _createClient(creds: MatrixClientCreds) {
         var opts = {
             baseUrl: creds.homeserverUrl,