Endpoint for user program certificate info and program letter links

[shanbady]

What are the relevant tickets?

Closes #556

Description (What does it do?)

This Pr adds an api endpoint (/api/v0/program_certificates) to retrieve program certificates along with program letter urls for an authenticated user. The idea is that when a user goes to a program specific dashboard, we will call this endpoint to get a list of program letter urls to display.

How can this be tested?

1. checkout this branch and generate some program certificates via

from profiles.models import ProgramCertificate
ProgramCertificate.objects.get_or_create(user_full_name='john doe',user_email='your@email.here', micromasters_program_id=1, program_title='Supply Chain Management')
ProgramCertificate.objects.get_or_create(user_full_name='john doe',user_email='your@email.here', micromasters_program_id=18, program_title='Statistics and Data Science')
ProgramCertificate.objects.get_or_create(user_full_name='john doe',user_email='your@email.here', micromasters_program_id=2, program_title='Data, Economics, and Development Policy')

2. visit endpoint http://localhost:8063/api/v0/program_certificates/ and confirm they your program certificates are listed there along with the program_letter_urls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.81%. Comparing base (f125f24) to head (20d3eb7).
Report is 4 commits behind head on main.

Additional details and impacted files

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+ Coverage   74.73%   74.81%   +0.07%     
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  Lines       11170    11204      +34     
  Branches     1943     1947       +4     
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+ Hits         8348     8382      +34     
  Misses       2648     2648              
  Partials      174      174              

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[mbertrand]

Looks good, but have some questions about the returned url and format.

[mbertrand]

This is returning urls in the format "/program_letter/1/", which will only work for the certificate's logged-in user. Wondering if maybe it should provide the shareable url instead if it exists yet (/program_letter/<uuid>/view), or both as separate fields (something like create_letter_url, share_letter_url) since it's possible the shareable url hasn't yet been created?

Also, what do you think of returning absolute urls instead (http://<domain>/program_letter/....)? The frontend could create a full url itself, but maybe easier to do it in the backend?

[shanbady]

@mbertrand - made it generate absolute urls and changed the url params to return both a program_letter_generate_url and a program_letter_share_url. I also made it so the serializer itself does a get_or_create for the program letter. In the future we might consider removing the intercept view altogether but I think it still has a place for now (i'm imagning a case where we send links to view view a program letter from some marketing automation software that is only aware of program ids etc)

[mbertrand]

👍