From 2a8b4e6876645575d9aa051f643a7bb04156bd59 Mon Sep 17 00:00:00 2001
From: Philipp Opheys <philipp@opheys.dev>
Date: Fri, 6 Oct 2023 21:41:52 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=A5=85=20show=20THI=20backend=20error=20(?=
 =?UTF-8?q?#336)?=
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---
 rogue-thi-app/pages/login.jsx              | 11 ++++++++++-
 rogue-thi-app/public/locales/de/login.json |  3 ++-
 rogue-thi-app/public/locales/en/login.json |  3 ++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/rogue-thi-app/pages/login.jsx b/rogue-thi-app/pages/login.jsx
index bea569df..a7b1e0ba 100644
--- a/rogue-thi-app/pages/login.jsx
+++ b/rogue-thi-app/pages/login.jsx
@@ -23,6 +23,10 @@ const PRIVACY_URL = process.env.NEXT_PUBLIC_PRIVACY_URL
 const GIT_URL = process.env.NEXT_PUBLIC_GIT_URL
 const GUEST_ONLY = !!process.env.NEXT_PUBLIC_GUEST_ONLY
 
+const KNOWN_BACKEND_ERRORS = [
+  'Response is not valid JSON'
+]
+
 export default function Login () {
   const router = useRouter()
   const { redirect } = router.query
@@ -56,7 +60,12 @@ export default function Login () {
       if (e.message.includes(ORIGINAL_ERROR_WRONG_CREDENTIALS)) {
         setFailure(t('error.wrongCredentials'))
       } else {
-        setFailure(t('error.generic'))
+        console.error(e)
+        if (KNOWN_BACKEND_ERRORS.some(error => e.message.includes(error))) {
+          setFailure(t('error.backend'))
+        } else {
+          setFailure(t('error.generic'))
+        }
       }
     }
   }
diff --git a/rogue-thi-app/public/locales/de/login.json b/rogue-thi-app/public/locales/de/login.json
index 3b9165fb..a4217351 100644
--- a/rogue-thi-app/public/locales/de/login.json
+++ b/rogue-thi-app/public/locales/de/login.json
@@ -1,7 +1,8 @@
 {
     "error": {
         "wrongCredentials": "Deine Zugangsdaten sind falsch.",
-        "generic": "Bei der Verbindung zum Server ist ein Fehler aufgetreten."
+        "generic": "Bei der Verbindung zum Server ist ein Fehler aufgetreten.",
+        "backend": "Das THI Backend ist derzeit nicht erreichbar. Bitte versuche es später erneut."
     },
     "alert": "Für diese Funktion musst du eingeloggt sein.",
     "guestOnly": {
diff --git a/rogue-thi-app/public/locales/en/login.json b/rogue-thi-app/public/locales/en/login.json
index ec63d109..87400a28 100644
--- a/rogue-thi-app/public/locales/en/login.json
+++ b/rogue-thi-app/public/locales/en/login.json
@@ -1,7 +1,8 @@
 {
     "error": {
         "wrongCredentials": "Your login credentials are incorrect.",
-        "generic": "An error occurred while connecting to the server."
+        "generic": "An error occurred while connecting to the server.",
+        "backend": "The THI backend is currently unavailable. Please try again later."
     },
     "alert": "You must be logged in to use this feature.",
     "guestOnly": {