Implement RFC 7523 JWT flows (#1247)
Co-authored-by: Yann Jouanin <yann.jouanin@valueandco.com>
This commit is contained in:
Luca Chang
GitHub
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commit
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1 changed files with 463 additions and 52 deletions
163
tests/client/auth/extensions/test_client_credentials.py
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163
tests/client/auth/extensions/test_client_credentials.py
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import urllib.parse
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import jwt
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import pytest
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from pydantic import AnyHttpUrl, AnyUrl
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from mcp.client.auth.extensions.client_credentials import JWTParameters, RFC7523OAuthClientProvider
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from mcp.shared.auth import OAuthClientInformationFull, OAuthClientMetadata, OAuthMetadata, OAuthToken
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class MockTokenStorage:
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"""Mock token storage for testing."""
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def __init__(self):
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self._tokens: OAuthToken | None = None
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self._client_info: OAuthClientInformationFull | None = None
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async def get_tokens(self) -> OAuthToken | None:
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return self._tokens
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async def set_tokens(self, tokens: OAuthToken) -> None:
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self._tokens = tokens
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async def get_client_info(self) -> OAuthClientInformationFull | None:
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return self._client_info
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async def set_client_info(self, client_info: OAuthClientInformationFull) -> None:
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self._client_info = client_info
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@pytest.fixture
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def mock_storage():
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return MockTokenStorage()
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@pytest.fixture
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def client_metadata():
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return OAuthClientMetadata(
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client_name="Test Client",
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client_uri=AnyHttpUrl("https://example.com"),
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redirect_uris=[AnyUrl("http://localhost:3030/callback")],
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scope="read write",
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)
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@pytest.fixture
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def rfc7523_oauth_provider(client_metadata: OAuthClientMetadata, mock_storage: MockTokenStorage):
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async def redirect_handler(url: str) -> None:
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"""Mock redirect handler."""
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pass
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async def callback_handler() -> tuple[str, str | None]:
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"""Mock callback handler."""
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return "test_auth_code", "test_state"
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return RFC7523OAuthClientProvider(
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server_url="https://api.example.com/v1/mcp",
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client_metadata=client_metadata,
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storage=mock_storage,
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redirect_handler=redirect_handler,
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callback_handler=callback_handler,
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)
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class TestOAuthFlowClientCredentials:
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"""Test OAuth flow behavior for client credentials flows."""
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@pytest.mark.anyio
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async def test_token_exchange_request_jwt_predefined(self, rfc7523_oauth_provider: RFC7523OAuthClientProvider):
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"""Test token exchange request building with a predefined JWT assertion."""
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# Set up required context
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rfc7523_oauth_provider.context.client_info = OAuthClientInformationFull(
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grant_types=["urn:ietf:params:oauth:grant-type:jwt-bearer"],
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token_endpoint_auth_method="private_key_jwt",
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redirect_uris=None,
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scope="read write",
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)
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rfc7523_oauth_provider.context.oauth_metadata = OAuthMetadata(
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issuer=AnyHttpUrl("https://api.example.com"),
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authorization_endpoint=AnyHttpUrl("https://api.example.com/authorize"),
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token_endpoint=AnyHttpUrl("https://api.example.com/token"),
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registration_endpoint=AnyHttpUrl("https://api.example.com/register"),
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)
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rfc7523_oauth_provider.context.client_metadata = rfc7523_oauth_provider.context.client_info
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rfc7523_oauth_provider.context.protocol_version = "2025-06-18"
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rfc7523_oauth_provider.jwt_parameters = JWTParameters(
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# https://www.jwt.io
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assertion="eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.KMUFsIDTnFmyG3nMiGM6H9FNFUROf3wh7SmqJp-QV30"
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)
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request = await rfc7523_oauth_provider._exchange_token_jwt_bearer()
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assert request.method == "POST"
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assert str(request.url) == "https://api.example.com/token"
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assert request.headers["Content-Type"] == "application/x-www-form-urlencoded"
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# Check form data
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content = urllib.parse.unquote_plus(request.content.decode())
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assert "grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer" in content
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assert "scope=read write" in content
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assert "resource=https://api.example.com/v1/mcp" in content
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assert (
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"assertion=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.KMUFsIDTnFmyG3nMiGM6H9FNFUROf3wh7SmqJp-QV30"
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in content
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)
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@pytest.mark.anyio
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async def test_token_exchange_request_jwt(self, rfc7523_oauth_provider: RFC7523OAuthClientProvider):
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"""Test token exchange request building wiith a generated JWT assertion."""
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# Set up required context
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rfc7523_oauth_provider.context.client_info = OAuthClientInformationFull(
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grant_types=["urn:ietf:params:oauth:grant-type:jwt-bearer"],
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token_endpoint_auth_method="private_key_jwt",
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redirect_uris=None,
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scope="read write",
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)
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rfc7523_oauth_provider.context.oauth_metadata = OAuthMetadata(
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issuer=AnyHttpUrl("https://api.example.com"),
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authorization_endpoint=AnyHttpUrl("https://api.example.com/authorize"),
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token_endpoint=AnyHttpUrl("https://api.example.com/token"),
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registration_endpoint=AnyHttpUrl("https://api.example.com/register"),
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)
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rfc7523_oauth_provider.context.client_metadata = rfc7523_oauth_provider.context.client_info
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rfc7523_oauth_provider.context.protocol_version = "2025-06-18"
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rfc7523_oauth_provider.jwt_parameters = JWTParameters(
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issuer="foo",
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subject="1234567890",
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claims={
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"name": "John Doe",
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"admin": True,
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"iat": 1516239022,
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},
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jwt_signing_algorithm="HS256",
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jwt_signing_key="a-string-secret-at-least-256-bits-long",
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jwt_lifetime_seconds=300,
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)
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request = await rfc7523_oauth_provider._exchange_token_jwt_bearer()
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assert request.method == "POST"
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assert str(request.url) == "https://api.example.com/token"
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assert request.headers["Content-Type"] == "application/x-www-form-urlencoded"
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# Check form data
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content = urllib.parse.unquote_plus(request.content.decode()).split("&")
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assert "grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer" in content
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assert "scope=read write" in content
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assert "resource=https://api.example.com/v1/mcp" in content
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# Check assertion
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assertion = next(param for param in content if param.startswith("assertion="))[len("assertion=") :]
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claims = jwt.decode(
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assertion,
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key="a-string-secret-at-least-256-bits-long",
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algorithms=["HS256"],
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audience="https://api.example.com/",
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subject="1234567890",
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issuer="foo",
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verify=True,
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)
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assert claims["name"] == "John Doe"
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assert claims["admin"]
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assert claims["iat"] == 1516239022
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