use prepared request to format payload before converting

[eyadgaran]

Use requests.PreparedRequest object to convert requests.Request into a formatted payload before converting into an OpenAPI request.

Fixes bug where one of the many requests.Request convenience methods (ex json) are used and payload is not stored in Request.data. Should also handle scenarios where persistent sessions have expected headers not applied to the request object until it is prepared and sent

[remram44]

I ran into this same problem with 'json'. I have to prepare the request either way to send it, so it makes sense for the OpenAPI Request object to be created from that.

[remram44]

I ran into problems trying to support requests with multipart/form-data. Nothing else worked, so I tried using this version. It does not solve the problem:

openapi_core.schema.media_types.exceptions.InvalidContentType: Content for following mimetype not found: multipart/form-data; boundary=6c20c84fd95c1d9ac73bcc7ed47fa1c0

edit: or does it hmmmm

[remram44]

I was using this code successfully, but it stopped working after updated openapi-core 0.13.6 to 0.13.7 with urlencoded bodies. It seems the urlencoded string gets validated rather than the decoded dictionary of values. I suspect it never worked but didn't signal an error because of abfd0c6.

Edit: I had to add a deserializer:

openapi_request_validator = RequestValidator(
    openapi_spec,
    custom_media_type_deserializers={
        'application/x-www-form-urlencoded': lambda v: v if isinstance(v, dict) else dict(urllib.parse.parse_qsl(v)),
    },
)

[codecov]

Codecov Report

Merging #271 (ff4a6c8) into master (6a222b9) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #271      +/-   ##
==========================================
+ Coverage   96.75%   96.77%   +0.01%     
==========================================
  Files         122      122              
  Lines        2436     2448      +12     
==========================================
+ Hits         2357     2369      +12     
  Misses         79       79              

Impacted Files	Coverage Δ
openapi_core/contrib/requests/requests.py	100.00% <100.00%> (ø)

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[p1c2u]

Added tests, removed py3 specific typing. LGTM

[p1c2u]

@eyadgaran thank you for the contribution.