refs #8613, refs #9228
- if you send a request to /authentication/token with `grant_type:password` and a Bearer token, Ghost was not able to handle this combination
- because it skipped the client authentication, see https://github.com/TryGhost/Ghost/blob/1.17.0/core/server/auth/authenticate.js#L13
- and OAuth detects the `grant_type: password` and jumps in the target implementation
- the target implementation for password authentication **again** tried to fetch the client and failed, because it relied on the previous client authentication
- see https://github.com/TryGhost/Ghost/blob/1.17.0/core/server/auth/oauth.js#L40 (client.slug is undefined if client authentication is skipped)
- ^ so this is the bug
- we **can** skip client authentication for requests to the API to fetch data for example e.g. GET /posts (including Bearer)
- so when is a client authentication required?
- RFC (https://tools.ietf.org/html/rfc6749#page-38) differentiates between confidential and public clients, Ghost has no implementation for this at the moment
- so in theory, public clients don't have to be authenticated, only if the credentials are included
- to not invent a breaking change, i decided to only make the client authentication required for password authentication
- we could change this in Ghost 2.0
I have removed the extra client request to the database for the password authentication, this is not needed. We already do client password authentication [here](https://github.com/TryGhost/Ghost/blob/1.17.0/core/server/auth/auth-strategies.js#L19);
If a Bearer token is present and you have not send a `grant_type` (which signalises OAuth to do authentication), you can skip the client authentication.
