Allow only unique proxy backend base paths

[bajiat]

In order to avoid having the same API added to the catalog more than once, we should only allow unique API backends. (As a follow-up, we may need to give an option to API owners to report, if someone else have added their API)

Definition of done

• User can only add an API with Add API Wizard, if the front-end prefix (proxy backend base path) is unique?
• If the user tries to add a pre-existing URL (with pre-existing frontend prefix?), they get an error saying that this API backend already exists.

[55]

Interested in this task.

[bajiat]

Check also: NREL/api-umbrella#252

[Nazarah]

I will add warning messages here

[jykae]

Depends on #1379

Discussed with @brylie that we will deprecate autoform-wizard package and use simple autoform for adding API. Number of fields (4 fields) without proxy related fields will be ok for one page form.

[jykae]

@bajiat @brylie I assume it is "API base URL" that should be unique? Do we want to support versioning of API?
For example: api.test.com/v1/ and api.test.com/v2/ Can I add those as one API or do I need to add version 2 as a separate API?

[brylie]

The frontend_prefix is the field that needs to be unique. This is because Proxy API Backends that share frontend prefixes will 'collide' with one another.