auth
auth/context.go
Parse the redirect URI early, add new failure modes to tests. When obtaining a grant code, parse the redirect_uri early as a URL, so we can fail without even hitting the database, if possible. Add a test to cover the scenario where the client doesn't specify an endpoint, and the client has no endpoints registered. Add a test to cover the scenario where the client has two endpoints registered, but doesn't specify an endpoint. Fix the test that tested for invalid URLs by actually using an invalid URL. Apparently, "not a URL" is a valid URL. Go figure.