Add a files pattern?

[lundberg]

As mentioned in #87, it might be of interest to allow matching a request on files being sent.

• What do we want to match on?
• Is it even possible once internal HTTPX request is built.

route = respx.post("https://example.org/", files=?)

Since uploading files with HTTPX supports multiple arg types, it might only be possible to match on file names, if given. Reading a file object's content could affect HTTPX internals, if not handled properly, like reseting seek point etc.

Needs further investigation, multiple files.

[ziima]

I used this utility function to extract files from the httpx.Request in tests:

import email
from httpx import Request
from typing import Any, Dict

def _get_data(request: Request) -> Dict[str, Any]:
    raw_data = (
        b'MIME-Version: 1.0\nContent-Type: '
        + request.headers['Content-Type'].encode(request.headers.encoding)
        + b'\n\n' + request.read())
    msg = email.message_from_bytes(raw_data)
    data = {}
    for payload in msg.get_payload():
        key = payload.get_param('name', header='Content-Disposition')
        decode = payload.get_content_maintype().startswith('application')
        data[key] = payload.get_payload(decode=decode)
    return data