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Port & upstream mypyc wheel build workflow (#3197)
[etc/vim.git] / src / blackd / middlewares.py
1 from typing import Awaitable, Callable, Iterable
2
3 from aiohttp.web_middlewares import middleware
4 from aiohttp.web_request import Request
5 from aiohttp.web_response import StreamResponse
6
7 Handler = Callable[[Request], Awaitable[StreamResponse]]
8 Middleware = Callable[[Request, Handler], Awaitable[StreamResponse]]
9
10
11 def cors(allow_headers: Iterable[str]) -> Middleware:
12     @middleware
13     async def impl(request: Request, handler: Handler) -> StreamResponse:
14         is_options = request.method == "OPTIONS"
15         is_preflight = is_options and "Access-Control-Request-Method" in request.headers
16         if is_preflight:
17             resp = StreamResponse()
18         else:
19             resp = await handler(request)
20
21         origin = request.headers.get("Origin")
22         if not origin:
23             return resp
24
25         resp.headers["Access-Control-Allow-Origin"] = "*"
26         resp.headers["Access-Control-Expose-Headers"] = "*"
27         if is_options:
28             resp.headers["Access-Control-Allow-Headers"] = ", ".join(allow_headers)
29             resp.headers["Access-Control-Allow-Methods"] = ", ".join(
30                 ("OPTIONS", "POST")
31             )
32
33         return resp
34
35     return impl  # type: ignore