Reworked MSC1915. Add request validation.

src/main/java/io/kamax/mxisd/config/MatrixConfig.java

@@ -62,6 +62,7 @@ public class MatrixConfig {
     private transient final Logger log = LoggerFactory.getLogger(MatrixConfig.class);
 
     private String domain;
+    private String trustedIdServer;
     private Identity identity = new Identity();
 
     public String getDomain() {
@@ -72,6 +73,14 @@ public class MatrixConfig {
         this.domain = domain;
     }
 
+    public String getTrustedIdServer() {
+        return trustedIdServer;
+    }
+
+    public void setTrustedIdServer(String trustedIdServer) {
+        this.trustedIdServer = trustedIdServer;
+    }
+
     public Identity getIdentity() {
         return identity;
     }