Oauth/token (#7)

* add host and protocol options

* some fiddling

* tidying up and comments

* tick off /oauth/token

* tidying a bit

* tidying

* go mod tidy

* allow attaching middleware to server

* add middleware

* more user friendly

* add comments

* comments

* store account + app

* tidying

* lots of restructuring

* lint + tidy

internal/module/oauth/clientstore.go

@@ -0,0 +1,73 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 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 oauth
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/gotosocial/gotosocial/internal/db"
+	"github.com/gotosocial/oauth2/v4"
+	"github.com/gotosocial/oauth2/v4/models"
+)
+
+type clientStore struct {
+	db db.DB
+}
+
+func newClientStore(db db.DB) oauth2.ClientStore {
+	pts := &clientStore{
+		db: db,
+	}
+	return pts
+}
+
+func (cs *clientStore) GetByID(ctx context.Context, clientID string) (oauth2.ClientInfo, error) {
+	poc := &oauthClient{
+		ID: clientID,
+	}
+	if err := cs.db.GetByID(clientID, poc); err != nil {
+		return nil, fmt.Errorf("database error: %s", err)
+	}
+	return models.New(poc.ID, poc.Secret, poc.Domain, poc.UserID), nil
+}
+
+func (cs *clientStore) Set(ctx context.Context, id string, cli oauth2.ClientInfo) error {
+	poc := &oauthClient{
+		ID:     cli.GetID(),
+		Secret: cli.GetSecret(),
+		Domain: cli.GetDomain(),
+		UserID: cli.GetUserID(),
+	}
+	return cs.db.UpdateByID(id, poc)
+}
+
+func (cs *clientStore) Delete(ctx context.Context, id string) error {
+	poc := &oauthClient{
+		ID: id,
+	}
+	return cs.db.DeleteByID(id, poc)
+}
+
+type oauthClient struct {
+	ID     string
+	Secret string
+	Domain string
+	UserID string
+}