Max
83 lines
3.6 KiB
Python
83 lines
3.6 KiB
Python
"""Bearer-gated MCP resource server (lowlevel API) + the same minimal ``client_credentials`` AS."""
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import base64
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import json
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import secrets
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from typing import Any
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from pydantic import AnyHttpUrl
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from starlette.applications import Starlette
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from starlette.requests import Request
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from starlette.responses import JSONResponse
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from starlette.routing import Route
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import mcp.types as types
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from mcp.server.auth.middleware.auth_context import get_access_token
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from mcp.server.auth.provider import AccessToken
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from mcp.server.context import ServerRequestContext
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from mcp.server.lowlevel import Server
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from mcp.shared.auth import OAuthMetadata, OAuthToken
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from stories._hosting import NO_DNS_REBIND, run_app_from_args
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from stories._shared.auth import BASE_URL, auth_settings
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from .server import DEMO_CLIENT_ID, DEMO_CLIENT_SECRET, DEMO_SCOPE
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def build_app() -> Starlette:
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issued: dict[str, AccessToken] = {}
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class _Verifier:
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async def verify_token(self, token: str) -> AccessToken | None:
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return issued.get(token)
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async def list_tools(
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ctx: ServerRequestContext[Any], params: types.PaginatedRequestParams | None
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) -> types.ListToolsResult:
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return types.ListToolsResult(tools=[types.Tool(name="whoami", input_schema={"type": "object"})])
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async def call_tool(ctx: ServerRequestContext[Any], params: types.CallToolRequestParams) -> types.CallToolResult:
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assert params.name == "whoami"
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token = get_access_token()
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assert token is not None
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payload = {"client_id": token.client_id, "scopes": token.scopes}
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return types.CallToolResult(content=[types.TextContent(text=json.dumps(payload))], structured_content=payload)
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server = Server("oauth-client-credentials-example", on_list_tools=list_tools, on_call_tool=call_tool)
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async def as_metadata(request: Request) -> JSONResponse:
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meta = OAuthMetadata(
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issuer=AnyHttpUrl(BASE_URL),
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authorization_endpoint=AnyHttpUrl(f"{BASE_URL}/authorize"), # unused; required
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token_endpoint=AnyHttpUrl(f"{BASE_URL}/token"),
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grant_types_supported=["client_credentials"],
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token_endpoint_auth_methods_supported=["client_secret_basic"],
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scopes_supported=[DEMO_SCOPE],
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)
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return JSONResponse(meta.model_dump(by_alias=True, mode="json", exclude_none=True))
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async def token_endpoint(request: Request) -> JSONResponse:
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form = await request.form()
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if form.get("grant_type") != "client_credentials":
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return JSONResponse({"error": "unsupported_grant_type"}, status_code=400)
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creds = base64.b64decode(request.headers.get("authorization", "").removeprefix("Basic ")).decode()
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if creds != f"{DEMO_CLIENT_ID}:{DEMO_CLIENT_SECRET}":
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return JSONResponse({"error": "invalid_client"}, status_code=401)
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access = f"access_{secrets.token_hex(16)}"
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issued[access] = AccessToken(token=access, client_id=DEMO_CLIENT_ID, scopes=[DEMO_SCOPE], expires_at=None)
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body = OAuthToken(access_token=access, token_type="Bearer", expires_in=3600, scope=DEMO_SCOPE)
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return JSONResponse(body.model_dump(exclude_none=True), headers={"cache-control": "no-store"})
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return server.streamable_http_app(
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auth=auth_settings(required_scopes=[DEMO_SCOPE]),
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token_verifier=_Verifier(),
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custom_starlette_routes=[
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Route("/.well-known/oauth-authorization-server", as_metadata, methods=["GET"]),
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Route("/token", token_endpoint, methods=["POST"]),
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],
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transport_security=NO_DNS_REBIND,
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)
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if __name__ == "__main__":
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run_app_from_args(build_app)
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