Remove trailing slash at the end of identity server.

Signed-off-by: Nicolas Buquet <[email protected]>

MatrixSDK/MXSession.m

@@ -832,6 +832,15 @@ - (void)handleSyncResponse:(MXSyncResponse *)syncResponse
 
 - (void)setIdentityServer:(NSString *)identityServer andAccessToken:(NSString *)accessToken
 {
+    // Old Account data can have a trailing slash at the end of their Identity Server.
+    // Ths can lead to unrecognized URL on the backend (like on 'invite to room') because the URL is then constructed
+    // with a double slash in its path.
+    // This lead to error 500 for these calls.
+    // Sp, fix this trailing slash as soon as we receive it.
+    if ([identityServer hasSuffix:@"/"]) {
+        identityServer = [identityServer substringToIndex:identityServer.length-1];
+    }
+
     MXLogDebug(@"[MXSession] setIdentityServer: %@", identityServer);
 
     matrixRestClient.identityServer = identityServer;