[feature] Add `created_at` and `error_description` to `/oauth/token` endpoint (#645)

* start fiddling about with oauth server

* start returning more helpful errors from oauth

* test helpful(ish) token errors

* add missing license header

2 files changed, 38 insertions, 0 deletions

diff --git a/internal/processing/oauth.go b/internal/processing/oauth.go
new file mode 100644
index 000000000..9c974f76e
--- /dev/null
+++ b/internal/processing/oauth.go
@@ -0,0 +1,35 @@
+/*
+   GoToSocial
+   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package processing
+
+import (
+	"net/http"
+
+	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
+)
+
+func (p *processor) OAuthHandleAuthorizeRequest(w http.ResponseWriter, r *http.Request) error {
+	// todo: some kind of metrics stuff here
+	return p.oauthServer.HandleAuthorizeRequest(w, r)
+}
+
+func (p *processor) OAuthHandleTokenRequest(r *http.Request) (map[string]interface{}, gtserror.WithCode) {
+	// todo: some kind of metrics stuff here
+	return p.oauthServer.HandleTokenRequest(r)
+}
diff --git a/internal/processing/processor.go b/internal/processing/processor.go
index a7a1c22e0..3afc25196 100644
--- a/internal/processing/processor.go
+++ b/internal/processing/processor.go
@@ -152,6 +152,9 @@ type Processor interface {
 	// NotificationsGet
 	NotificationsGet(ctx context.Context, authed *oauth.Auth, limit int, maxID string, sinceID string) (*apimodel.TimelineResponse, gtserror.WithCode)
 
+	OAuthHandleTokenRequest(r *http.Request) (map[string]interface{}, gtserror.WithCode)
+	OAuthHandleAuthorizeRequest(w http.ResponseWriter, r *http.Request) error
+
 	// SearchGet performs a search with the given params, resolving/dereferencing remotely as desired
 	SearchGet(ctx context.Context, authed *oauth.Auth, searchQuery *apimodel.SearchQuery) (*apimodel.SearchResult, gtserror.WithCode)