fix(login): surface raw response body for non-JSON auth errors (fixes #305)

src/bring.ts

@@ -152,19 +152,31 @@ class Bring {
      * Try to log into given account
      */
     async login(): Promise<void> {
-        let data: AuthResponse;
+        let resp: Response;
+        let bodyText: string;
 
         try {
-            const resp = await fetch(`${this.url}bringauth`, {
+            resp = await fetch(`${this.url}bringauth`, {
                 method: 'POST',
                 body: new URLSearchParams({ email: this.mail, password: this.password })
             });
 
-            data = await resp.json();
+            // Read as text first so non-JSON bodies (e.g. text/plain "Invalid Email.",
+            // HTML maintenance pages, Cloudflare challenges) are preserved verbatim
+            // instead of being swallowed by resp.json() as "Failed to parse JSON".
+            bodyText = await resp.text();
         } catch (e: any) {
             throw new Error(`Cannot Login: ${e.message}`);
         }
 
+        let data: AuthResponse;
+        try {
+            data = JSON.parse(bodyText);
+        } catch {
+            const snippet = bodyText.trim().slice(0, 500) || '(empty body)';
+            throw new Error(`Cannot Login: ${resp.status} ${snippet}`);
+        }
+
         if ('error' in data) {
             throw new Error(`Cannot Login: ${data.message}`);
         }