fix: raise RuntimeError on missing JWT_SECRET_KEY in non-test environments

Prevents production deployments from silently using a hardcoded default
secret. TESTING=1 still resolves to a built-in test key so the existing
test suite is unaffected. Adds a test that verifies the RuntimeError is
raised when neither JWT_SECRET_KEY nor TESTING is set.

app/auth/jwt.py

@@ -6,12 +6,20 @@ from typing import Optional
 
 import jwt
 
-SECRET_KEY = os.environ.get("JWT_SECRET_KEY", "dev-jwt-secret-change-in-production")
+SECRET_KEY = os.environ.get("JWT_SECRET_KEY", "")
 
+if not SECRET_KEY:
+    if os.environ.get("TESTING", "").lower() in ("1", "true"):
+        SECRET_KEY = "test-jwt-secret-key-minimum-32-chars!!"
+    else:
+        raise RuntimeError(
+            "JWT_SECRET_KEY environment variable is required. "
+            "Generate one: python -c \"import secrets; print(secrets.token_hex(32))\""
+        )
+elif len(SECRET_KEY) < 32 and os.environ.get("TESTING", "").lower() not in ("1", "true"):
     import warnings as _warnings
-if len(SECRET_KEY) < 32 and os.environ.get("TESTING", "").lower() not in ("1", "true"):
     _warnings.warn(
-        f"JWT_SECRET_KEY is {len(SECRET_KEY)} chars — minimum 32 recommended for production",
+        f"JWT_SECRET_KEY is {len(SECRET_KEY)} chars — minimum 32 recommended",
         UserWarning, stacklevel=2,
     )
 

tests/test_security.py

@@ -1,6 +1,8 @@
 """Security tests — sandbox escapes, SQL injection, access control."""
 
+import importlib
 import os
+import sys
 import pytest
 from fastapi.testclient import TestClient
 
@@ -190,3 +192,32 @@ class TestAuthSecurity:
         c, _ = client
         resp = c.get("/api/scripts")
         assert resp.status_code == 401
+
+
+# ---- JWT Secret Hardening ----
+
+class TestJwtSecretHardening:
+    def test_raises_without_jwt_secret_in_non_test_env(self):
+        """Module-level code must raise RuntimeError when JWT_SECRET_KEY is absent
+        and TESTING is not set, preventing accidental production deploys with no secret."""
+        saved_key = os.environ.pop("JWT_SECRET_KEY", None)
+        saved_testing = os.environ.pop("TESTING", None)
+        # Eject any cached module so the re-import re-executes module-level code
+        sys.modules.pop("app.auth.jwt", None)
+        try:
+            with pytest.raises(RuntimeError, match="JWT_SECRET_KEY environment variable is required"):
+                importlib.import_module("app.auth.jwt")
+        finally:
+            # Restore environment before re-importing so the module loads cleanly
+            if saved_key is not None:
+                os.environ["JWT_SECRET_KEY"] = saved_key
+            if saved_testing is not None:
+                os.environ["TESTING"] = saved_testing
+            # If neither was set (bare test run), use TESTING flag so reload works
+            if saved_key is None and saved_testing is None:
+                os.environ["TESTING"] = "1"
+            sys.modules.pop("app.auth.jwt", None)
+            importlib.import_module("app.auth.jwt")
+            # Clean up the temporary TESTING flag if we added it
+            if saved_key is None and saved_testing is None:
+                os.environ.pop("TESTING", None)