Return token's primary key with POST /oauth/token

docs/development/API/differences_in_mastoapi_responses.md

@@ -255,9 +255,29 @@ This information is returned in the `/api/v1/accounts/verify_credentials` endpoi
 
 *Pleroma supports refreshing tokens.*
 
-`POST /oauth/token`
+### POST `/oauth/token`
 
-Post here request with `grant_type=refresh_token` to obtain new access token. Returns an access token.
+You can obtain access tokens for a user in a few additional ways.
+
+#### Refreshing a token
+
+To obtain a new access token from a refresh token, pass `grant_type=refresh_token` with the following extra parameters:
+
+- `refresh_token`: The refresh token.
+
+#### Getting a token with a password
+
+To obtain a token from a user's password, pass `grant_type=password` with the following extra parameters:
+
+- `username`: Username to authenticate.
+- `password`: The user's password.
+
+#### Response body
+
+Additional fields are returned in the response:
+
+- `id`: The primary key of this token in Pleroma's database.
+- `me` (user tokens only): The ActivityPub ID of the user who owns the token.
 
 ## Account Registration
 

lib/pleroma/web/o_auth/o_auth_view.ex

@@ -10,6 +10,7 @@ defmodule Pleroma.Web.OAuth.OAuthView do
 
   def render("token.json", %{token: token} = opts) do
     response = %{
+      id: token.id,
       token_type: "Bearer",
       access_token: token.token,
       refresh_token: token.refresh_token,

test/pleroma/web/o_auth/o_auth_controller_test.exs

@@ -805,10 +805,12 @@ test "issues a token for `password` grant_type with valid credentials, with full
           "client_secret" => app.client_secret
         })
 
-      assert %{"access_token" => token} = json_response(conn, 200)
+      assert %{"id" => id, "access_token" => access_token} = json_response(conn, 200)
 
-      token = Repo.get_by(Token, token: token)
+      token = Repo.get_by(Token, token: access_token)
       assert token
+      assert token.id == id
+      assert token.token == access_token
       assert token.scopes == app.scopes
     end