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docs_src/security/tutorial004_an_py310.py

@@ -11,7 +11,9 @@ from pydantic import BaseModel
 
 # to get a string like this run:
 # openssl rand -hex 32
-SECRET_KEY = os.getenv("SECRET_KEY", "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7")
+SECRET_KEY = os.getenv(
+    "SECRET_KEY", "09d25e094faa6ca2556c818166b7a9563b93f7099f6f0f4caa6cf63b88e8d3e7"
+)
 ALGORITHM = "HS256"
 ACCESS_TOKEN_EXPIRE_MINUTES = 30
 

tests/test_invariant_tutorial004_an_py310.py

@@ -1,47 +1,69 @@
-import pytest
-import sys
+import base64
+import json
 import os
+import sys
 from datetime import datetime, timedelta
-import json
-import base64
+
+import pytest
 
 # Add the project root to sys.path to import the module
-sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), '../../..')))
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "../../..")))
 
 from docs_src.security.tutorial004_an_py310 import decode_and_validate_token
 
-@pytest.mark.parametrize("token_payload", [
-    # Exact exploit case: token with expired timestamp
-    json.dumps({"user_id": "admin", "exp": int((datetime.utcnow() - timedelta(hours=1)).timestamp())}),
-    
-    # Boundary case: token with no expiration claim
-    json.dumps({"user_id": "attacker"}),
-    
-    # Valid input: token with future expiration
-    json.dumps({"user_id": "user123", "exp": int((datetime.utcnow() + timedelta(hours=1)).timestamp())}),
-    
-    # Adversarial case: token with malformed expiration (string instead of int)
-    json.dumps({"user_id": "evil", "exp": "never"}),
-    
-    # Adversarial case: token with far future expiration (beyond reasonable bounds)
-    json.dumps({"user_id": "admin", "exp": int((datetime.utcnow() + timedelta(days=365*10)).timestamp())}),
-])
+
+@pytest.mark.parametrize(
+    "token_payload",
+    [
+        # Exact exploit case: token with expired timestamp
+        json.dumps(
+            {
+                "user_id": "admin",
+                "exp": int((datetime.utcnow() - timedelta(hours=1)).timestamp()),
+            }
+        ),
+        # Boundary case: token with no expiration claim
+        json.dumps({"user_id": "attacker"}),
+        # Valid input: token with future expiration
+        json.dumps(
+            {
+                "user_id": "user123",
+                "exp": int((datetime.utcnow() + timedelta(hours=1)).timestamp()),
+            }
+        ),
+        # Adversarial case: token with malformed expiration (string instead of int)
+        json.dumps({"user_id": "evil", "exp": "never"}),
+        # Adversarial case: token with far future expiration (beyond reasonable bounds)
+        json.dumps(
+            {
+                "user_id": "admin",
+                "exp": int((datetime.utcnow() + timedelta(days=365 * 10)).timestamp()),
+            }
+        ),
+    ],
+)
 def test_jwt_expiration_validation_invariant(token_payload):
     """Invariant: JWT tokens must be rejected if expired or lacking proper expiration validation."""
-    
+
     # Create a simple JWT-like token (header.payload.signature)
-    header = base64.urlsafe_b64encode(json.dumps({"alg": "HS256", "typ": "JWT"}).encode()).rstrip(b'=')
-    payload = base64.urlsafe_b64encode(token_payload.encode()).rstrip(b'=')
-    signature = base64.urlsafe_b64encode(b"fakesignature").rstrip(b'=')
+    header = base64.urlsafe_b64encode(
+        json.dumps({"alg": "HS256", "typ": "JWT"}).encode()
+    ).rstrip(b"=")
+    payload = base64.urlsafe_b64encode(token_payload.encode()).rstrip(b"=")
+    signature = base64.urlsafe_b64encode(b"fakesignature").rstrip(b"=")
     token = f"{header.decode()}.{payload.decode()}.{signature.decode()}"
-    
+
     try:
         result = decode_and_validate_token(token)
         # If token is accepted, it must have a valid future expiration
         payload_dict = json.loads(token_payload)
-        assert "exp" in payload_dict, "Token without expiration claim should be rejected"
+        assert "exp" in payload_dict, (
+            "Token without expiration claim should be rejected"
+        )
         assert isinstance(payload_dict["exp"], int), "Expiration must be integer"
-        assert payload_dict["exp"] > int(datetime.utcnow().timestamp()), "Token expiration must be in future"
-    except Exception as e:
+        assert payload_dict["exp"] > int(datetime.utcnow().timestamp()), (
+            "Token expiration must be in future"
+        )
+    except Exception:
         # Any validation failure is acceptable - the invariant holds
-        assert True
+        assert True