fix(jwt): display jwt env variable error to user

Author: aarthy-dk

README.md

@@ -135,6 +135,9 @@ export TG_DECRYPT_SALT=<encryption_salt>
 export TESTGEN_USERNAME=<username>
 export TESTGEN_PASSWORD=<password>
 
+# Set an arbitrary base64-encoded string to be used for signing authentication tokens
+export TG_JWT_HASHING_KEY=<base64_key>
+
 # Set an accessible path for storing application logs
 export TESTGEN_LOG_FILE_PATH=<path_for_logs>
 ```

docs/local_development.md

@@ -64,6 +64,7 @@ Create a `local.env` file with the following environment variables, replacing th
 export TESTGEN_DEBUG=yes
 export TESTGEN_LOG_TO_FILE=no
 export TG_ANALYTICS=no
+export TG_JWT_HASHING_KEY=<base64_key>
 export TESTGEN_USERNAME=<username>
 export TESTGEN_PASSWORD=<password>
 export TG_DECRYPT_SALT=<decrypt_salt>

testgen/ui/services/user_session_service.py

@@ -24,10 +24,11 @@ def _get_jwt_hashing_key() -> bytes:
     try:
         return base64.b64decode(settings.JWT_HASHING_KEY_B64.encode("ascii"))
     except Exception as e:
-        raise ValueError(
-            "Error reading the JWT signing key from settings. Make sure you have a valid base 64 "
-            "string assigned to the TG_JWT_HASHING_KEY environment variable."
-        ) from e
+        st.error(
+            "Error reading the JWT signing key from settings.\n\n Make sure you have a valid "
+            "base64 string assigned to the TG_JWT_HASHING_KEY environment variable."
+        )
+        st.stop()
 
 
 def load_user_session() -> None: