Static jwk key (#20)

* Drop AsyncJWK to use static JWK public key

* Simplest possible readme

Author: nkiryanov

README.md

@@ -0,0 +1,8 @@
+### websockets-notifications demo
+
+#### How to set JWK public key to validate jwt tokens
+One of the options:
+1. By setting the key as an environment variable named `JWT_PUBLIC_KEY`.
+2. By placing the key in a file named `jwt_public_key.pem` inside the `secrets` folder in repo root.
+
+If both options are set, the application will not start.

env.example

@@ -9,5 +9,4 @@ WEBSOCKETS_HOST=localhost
 WEBSOCKETS_PORT=6789
 WEBSOCKETS_PATH=/v1/test-subscription-websocket
 
-AUTH_JWKS_URL=https://auth-test.contoso.com/auth/realms/test-realm/protocol/openid-connect/certs
-AUTH_SUPPORTED_SIGNING_ALGORITHMS=["RS256"]
+JWT_PUBLIC_KEY=-----BEGIN PUBLIC KEY-----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-----END PUBLIC KEY-----

secrets/.gitkeep

@@ -0,0 +1,109 @@
+import pytest
+
+import jwt
+
+from app.types import UserId
+
+
+@pytest.fixture
+def jwt_private_key():
+    """For test purposes only. The running application should not access the private key."""
+    return """-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----
+"""
+
+
+@pytest.fixture
+def jwt_public_key():
+    return """-----BEGIN PUBLIC KEY-----
+MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAqdnObC47NUAqOOCvOzOg
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+-----END PUBLIC KEY-----
+"""
+
+
+@pytest.fixture
+def set_jwt_public_key(settings, jwt_public_key):
+    settings.JWT_PUBLIC_KEY = jwt_public_key
+    return settings
+
+
+@pytest.fixture
+def create_jwt_for_user(jwt_private_key):
+    def create_jwt(user_id: UserId, timestamp_expired_at: int) -> str:
+        payload = {
+            "sub": user_id,
+            "exp": timestamp_expired_at,
+        }
+
+        return jwt.encode(payload=payload, key=jwt_private_key, algorithm="RS256")
+
+    return create_jwt
+
+
+@pytest.fixture
+def jwt_user_valid_token(create_jwt_for_user):
+    return create_jwt_for_user(
+        user_id="user",
+        timestamp_expired_at=4700000000,  # year of expiration 2118
+    )

src/a12n/fixtures.py

@@ -0,0 +1,15 @@
+from typing import Any
+
+import jwt
+
+from app.conf import get_app_settings
+from app.types import DecodedValidToken
+
+
+def decode(jwt_token: str, **kwargs: Any) -> DecodedValidToken:
+    """Validate and decode a JWT token with public key.
+
+    Adjust validation parameters to project requirements (like algorithms, required claims, etc).
+    """
+    decoded = jwt.decode(jwt=jwt_token, key=get_app_settings().JWT_PUBLIC_KEY, algorithms=["RS256"], **kwargs)
+    return DecodedValidToken(**decoded)