Merge pull request DSpace#3929 from DSpace/backport-3912-to-dspace-7_x

[Port dspace-7_x] Fix auth in UI with LDAP if password authentication is disabled

Author: tdonohue

src/app/core/auth/auth.interceptor.ts

@@ -116,12 +116,24 @@ export class AuthInterceptor implements HttpInterceptor {
    */
   private sortAuthMethods(authMethodModels: AuthMethod[]): AuthMethod[] {
     const sortedAuthMethodModels: AuthMethod[] = [];
+    let passwordAuthFound = false;
+    let ldapAuthFound = false;
+
     authMethodModels.forEach((method) => {
       if (method.authMethodType === AuthMethodType.Password) {
         sortedAuthMethodModels.push(method);
+        passwordAuthFound = true;
+      }
+      if (method.authMethodType === AuthMethodType.Ldap) {
+        ldapAuthFound = true;
       }
     });
 
+    // Using password authentication method to provide UI for LDAP authentication even if password auth is not present in server
+    if (ldapAuthFound && !(passwordAuthFound)) {
+      sortedAuthMethodModels.push(new AuthMethod(AuthMethodType.Password,0));
+    }
+
     authMethodModels.forEach((method) => {
       if (method.authMethodType !== AuthMethodType.Password) {
         sortedAuthMethodModels.push(method);