Expose user/app checking for Builder in a builder specific hook

[helgi]

Relates to deis/builder#81 and deis/builder#122

TL;DR from deis/builder#122 (has a more detailed discussion)

Expose GET /v2/hooks/keys/$APP_NAME and GET /v2/hooks/keys/$APP_NAME/$USER_NAME endpoints for Builder Auth Key only where it returns 404 when APP_NAME or USER_NAME are missing.

Return body will be {"users": {"aaron": "keysandthings"}} for the APP_NAME specific hook and {"key": "keysandthings"} for the per user hook

[arschles]

@helgi is "keysandthings" gonna be just the pub key for the user?

[helgi]

Yeah, whatever the key is that you need in the builder, which is the public

[helgi]

I changed it so that the APP_NAME/USER_NAME endpoint returns {"$USERNAME": "$KEY"}

If we want to support multiple keys per user then I could change the key part into a list - Thoughts?

[arschles]

I changed it so that the APP_NAME/USER_NAME endpoint returns {"$USERNAME": "$KEY"}

👍

If we want to support multiple keys per user then I could change the key part into a list - Thoughts?

So the response body would look like the following?

{"users":[{"$USERNAME":"$KEY"},...]}