1 files changed, 20 insertions, 6 deletions
diff --git a/packages/demobank-ui/src/hooks/backend.ts b/packages/demobank-ui/src/hooks/backend.ts
index 3fe744874..e0b8d83ef 100644
--- a/packages/demobank-ui/src/hooks/backend.ts
+++ b/packages/demobank-ui/src/hooks/backend.ts
@@ -17,6 +17,7 @@
 import { canonicalizeBaseUrl } from "@gnu-taler/taler-util";
 import {
   ErrorType,
+  HttpError,
   RequestError,
   useLocalStorage,
 } from "@gnu-taler/web-util/lib/index.browser";
@@ -193,6 +194,22 @@ export function usePublicBackend(): useBackendType {
   };
 }
 
+type CheckResult = ValidResult | RequestInvalidResult | InvalidationResult;
+
+interface ValidResult {
+  valid: true;
+}
+interface RequestInvalidResult {
+  valid: false;
+  requestError: true;
+  cause: RequestError<any>["cause"];
+}
+interface InvalidationResult {
+  valid: false;
+  requestError: false;
+  error: unknown;
+}
+
 export function useCredentialsChecker() {
   const { request } = useApiContext();
   const baseUrl = getInitialBackendBaseURL();
@@ -201,10 +218,7 @@ export function useCredentialsChecker() {
   return async function testLogin(
     username: string,
     password: string,
-  ): Promise<{
-    valid: boolean;
-    cause?: ErrorType;
-  }> {
+  ): Promise<CheckResult> {
     try {
       await request(baseUrl, `access-api/accounts/${username}/`, {
         basicAuth: { username, password },
@@ -213,9 +227,9 @@ export function useCredentialsChecker() {
       return { valid: true };
     } catch (error) {
       if (error instanceof RequestError) {
-        return { valid: false, cause: error.cause.type };
+        return { valid: false, requestError: true, cause: error.cause };
       }
-      return { valid: false, cause: ErrorType.UNEXPECTED };
+      return { valid: false, requestError: false, error };
     }
   };
 }