add Authorization header for oauth2 in swagger ui schema request

[ds1371dani]

I was trying to add swagger to my drf application which is using django-oauth-toolkit, my api should not be accessible by everyone so I used this config:

SPECTACULAR_SETTINGS = {
    'TITLE': API_TITLE,
    'DESCRIPTION': API_DESCRIPTION,
    'VERSION': '0.2.0',
    'SERVE_INCLUDE_SCHEMA': True,
    'SWAGGER_UI_DIST': 'SIDECAR',
    'SWAGGER_UI_FAVICON_HREF': 'SIDECAR',

    'SWAGGER_UI_SETTINGS': {
        'persistAuthorization': True,
    },
    'SERVE_PUBLIC': False,
    'AUTHENTICATION_WHITELIST': [
        'rest_framework.authentication.TokenAuthentication',
        'oauth2_provider.contrib.rest_framework.OAuth2Authentication'
    ],
    'SERVE_PERMISSIONS': ['rest_framework.permissions.AllowAny'],

    'SERVE_AUTHENTICATION': [
        'rest_framework.authentication.TokenAuthentication',
        'oauth2_provider.contrib.rest_framework.OAuth2Authentication'
    ],
    'OAUTH2_FLOWS': ['password'],
    'OAUTH2_AUTHORIZATION_URL': '/o/authorize/',
    'OAUTH2_TOKEN_URL': '/o/token/',
    'OAUTH2_REFRESH_URL': '/o/token/',
    'OAUTH2_SCOPES': OAUTH2_PROVIDER['SCOPES'],
}

When using TokenAuthentication everything was ok (Authorization header was added to both schema and api requests), but when I tried using OAuth2Authentication my api requests where ok but the schema request did not receive Authorization token.

The problem was in swagger-ui.js where id didn't try reading oauth2 config stored in the browser.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e0f749e) 98.54% compared to head (49254cf) 98.54%.

Additional details and impacted files

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##           master    #1017   +/-   ##
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  Coverage   98.54%   98.54%           
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  Files          68       68           
  Lines        8338     8338           
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  Hits         8217     8217           
  Misses        121      121           

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[tfranzel]

great catch, this was missing functionality! thx @ds1371dani