Add all declared scopes is auth.oauth2.scopes discovery file section

[clementdenis]

Currently, only the email scope is asked by the API explorer, because other scopes declared by APIs and API methods are not aggregated in the discovery file. This brings Cloud Endpoints on par with the behavior of Google own APIs.

[codecov-io]

Codecov Report

Merging #92 into master will increase coverage by 0.06%. The diff coverage is 93.93%.

@@             Coverage Diff              @@
##             master      #92      +/-   ##
============================================
+ Coverage     80.02%   80.09%   +0.06%     
- Complexity     1681     1689       +8     
============================================
  Files           156      157       +1     
  Lines          5597     5626      +29     
  Branches        731      732       +1     
============================================
+ Hits           4479     4506      +27     
- Misses          838      841       +3     
+ Partials        280      279       -1

Impacted Files	Coverage Δ	Complexity Δ
...e/api/server/spi/discovery/DiscoveryGenerator.java	88.84% <100%> (+0.44%)	63 <0> (+1)	:arrow_up:
...i/server/spi/config/model/AuthScopeRepository.java	90% <90%> (ø)	7 <7> (?)
...ig/annotationreader/ApiAnnotationIntrospector.java	91.42% <0%> (-1.43%)	29% <0%> (-1%)
.../server/spi/discovery/CommonPathPrefixBuilder.java	100% <0%> (+5.55%)	9% <0%> (+1%)	:arrow_up:

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[clementdenis]

Hi @tangiel , Could you have another look at this one? I added AuthScopeDescriptions to fetch up-to-date scopes automatically (updating scopeDescriptions.properties is still manual though).

[clementdenis]

I extracted the logic for scope description handling to its own class, should be clearer.

[tangiel]

I don't know if you saw my comment since it was in an outdated comment, but: This probably needs to be documented better, but the comma separation is a logical OR for scopes. To require multiple scopes simultaneously you are supposed to use one string with space separation.

[clementdenis]

I just updated the PR to handle scope conjunction expressions properly.

And I learned something about scope expressions :-)

[tangiel]

Thanks @clementdenis, sorry it took so long to review.