122 lines
4.5 KiB
Python
122 lines
4.5 KiB
Python
"""Tests for the request checks shared by the HTTP server transports."""
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from collections.abc import Iterator
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from unittest.mock import AsyncMock
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import pytest
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from starlette.types import Message, Receive, Scope, Send
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from mcp.server.transport_security import RequestBodyLimitMiddleware
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@pytest.mark.anyio
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async def test_request_body_chunks_are_replayed_as_one_message() -> None:
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"""SDK-defined: raw ASGI proves chunk overhead is discarded before the body reaches the transport."""
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request_messages: Iterator[Message] = iter(
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[
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{"type": "http.request", "body": b"12", "more_body": True},
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{"type": "http.request", "body": b"34", "more_body": True},
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{"type": "http.request", "body": b"56", "more_body": False},
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{"type": "http.disconnect"},
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]
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)
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received_messages: list[Message] = []
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async def receive() -> Message:
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return next(request_messages)
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async def app(scope: Scope, receive: Receive, send: Send) -> None:
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received_messages.append(await receive())
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received_messages.append(await receive())
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scope: Scope = {"type": "http", "method": "POST", "path": "/mcp", "headers": []}
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middleware = RequestBodyLimitMiddleware(app, max_body_size=8)
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await middleware(scope, receive, AsyncMock())
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assert received_messages == [
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{"type": "http.request", "body": b"123456", "more_body": False},
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{"type": "http.disconnect"},
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]
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@pytest.mark.anyio
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async def test_client_disconnect_while_streaming_request_body_is_replayed() -> None:
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"""SDK-defined: raw ASGI is required to prove a disconnect before body completion reaches the transport."""
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disconnect: Message = {"type": "http.disconnect"}
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request_messages: Iterator[Message] = iter(
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[{"type": "http.request", "body": b"1234", "more_body": True}, disconnect]
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)
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received_messages: list[Message] = []
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async def receive() -> Message:
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return next(request_messages)
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async def app(scope: Scope, receive: Receive, send: Send) -> None:
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received_messages.append(await receive())
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received_messages.append(await receive())
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scope: Scope = {"type": "http", "method": "POST", "path": "/mcp", "headers": []}
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middleware = RequestBodyLimitMiddleware(app, max_body_size=8)
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await middleware(scope, receive, AsyncMock())
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assert received_messages == [
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{"type": "http.request", "body": b"1234", "more_body": True},
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disconnect,
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]
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@pytest.mark.anyio
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async def test_disconnect_before_request_body_is_replayed() -> None:
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"""SDK-defined: raw ASGI proves a disconnect before the first body message reaches the transport."""
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disconnect: Message = {"type": "http.disconnect"}
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received_messages: list[Message] = []
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async def receive() -> Message:
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return disconnect
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async def app(scope: Scope, receive: Receive, send: Send) -> None:
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received_messages.append(await receive())
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scope: Scope = {"type": "http", "method": "POST", "path": "/mcp", "headers": []}
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middleware = RequestBodyLimitMiddleware(app, max_body_size=8)
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await middleware(scope, receive, AsyncMock())
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assert received_messages == [disconnect]
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@pytest.mark.anyio
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@pytest.mark.parametrize("method", ["GET", "PUT", "OPTIONS", "HEAD", "DELETE"])
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async def test_request_body_limit_applies_to_every_method(method: str) -> None:
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"""SDK-defined: the limit is a property of the request body, not of the method that carries it."""
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app = AsyncMock()
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sent_messages: list[Message] = []
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receive = AsyncMock(return_value={"type": "http.request", "body": b"123456789", "more_body": False})
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async def send(message: Message) -> None:
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sent_messages.append(message)
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scope: Scope = {"type": "http", "method": method, "path": "/mcp", "headers": []}
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middleware = RequestBodyLimitMiddleware(app, max_body_size=8)
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await middleware(scope, receive, send)
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assert [message["status"] for message in sent_messages if message["type"] == "http.response.start"] == [413]
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app.assert_not_awaited()
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@pytest.mark.anyio
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async def test_request_body_limit_leaves_non_http_scopes_alone() -> None:
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"""SDK-defined: only HTTP requests carry a body to limit; other ASGI scopes go straight to the app."""
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app = AsyncMock()
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receive = AsyncMock()
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send = AsyncMock()
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scope: Scope = {"type": "lifespan"}
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middleware = RequestBodyLimitMiddleware(app, max_body_size=8)
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await middleware(scope, receive, send)
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app.assert_awaited_once_with(scope, receive, send)
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receive.assert_not_awaited()
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