Add an authorize endpoint that uses JSON instead of a Django template…

[jhnbyrn]

…/HTML form

Fixes #1305

Description of the Change

For single page applications it would be handy to be able to get the data for the authorization page as JSON and then render the authorization page on the client side, and similarly post the results as JSON rather than as a HTML form.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

Merging #1306 (78bd3e8) into master (a4ae1d4) will increase coverage by 0.00%.
The diff coverage is 95.83%.

@@           Coverage Diff           @@
##           master    #1306   +/-   ##
=======================================
  Coverage   97.37%   97.38%           
=======================================
  Files          32       32           
  Lines        2022     2028    +6     
=======================================
+ Hits         1969     1975    +6     
  Misses         53       53           

Files Changed	Coverage Δ
oauth2_provider/views/base.py	97.97% <95.83%> (+0.08%)	⬆️

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[dashdanw]

you could potentially avoid iteration by filtering by your desired scopes (assuming the scopes var here is the required scopes of the view)

Suggested change

	.objects.filter(
	scopes_filter = { 'scopes__icontains': scope for scope in scopes }
	.objects.filter(
	user=request.user,
	application=kwargs["application"],
	expires__gt=timezone.now(),
	**scopes_filter
	).first()

[dopry]

@jhnbyrn can you rebase this.. i'm open to using a mixin here if it enables you use case and doesn't break existing functionality.