From e421c851c980d36f35868e8f03ba397685fe9545 Mon Sep 17 00:00:00 2001
From: Clemens Sonnleitner <clemens.sonnleitner@ins.uni-stuttgart.de>
Date: Fri, 27 Nov 2020 13:08:45 +0100
Subject: [PATCH] Force MatrixID to be lowercase

---
 .../java/io/kamax/mxisd/backend/ldap/LdapBackend.java     | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/main/java/io/kamax/mxisd/backend/ldap/LdapBackend.java b/src/main/java/io/kamax/mxisd/backend/ldap/LdapBackend.java
index 8a6a018..49a12b4 100644
--- a/src/main/java/io/kamax/mxisd/backend/ldap/LdapBackend.java
+++ b/src/main/java/io/kamax/mxisd/backend/ldap/LdapBackend.java
@@ -117,11 +117,15 @@ public abstract class LdapBackend {
 
     public String buildMatrixIdFromUid(String uid) {
         String uidType = getCfg().getAttribute().getUid().getType();
-        String localpart = uid;
+        String localpart = uid.toLowerCase();
+
+        if (!StringUtils.equals(uid, localpart)) {
+            log.info("UID {} from LDAP has been changed to lowercase to match the Synapse specifications", uid);
+        }
 
         if (StringUtils.equals(UID, uidType)) {
             if(getCfg().isActiveDirectory()) {
-                localpart  = new UPN(uid).getMXID();
+                localpart  = new UPN(uid.toLowerCase()).getMXID();
             }
 
             return "@" + localpart + ":" + mxCfg.getDomain();