moved OAuth2Authenticator to auth package

internal/auth/auth.go

@@ -0,0 +1,34 @@
+/*
+Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>
+
+Scotty is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later version.
+
+Scotty 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+Scotty. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package auth
+
+import (
+	"net/url"
+
+	"go.uploadedlobster.com/scotty/internal/models"
+	"golang.org/x/oauth2"
+)
+
+// Must be implemented by backends requiring OAuth2 authentication
+type OAuth2Authenticator interface {
+	models.Backend
+
+	// Returns OAuth2 config suitable for this backend
+	OAuth2Strategy(redirectUrl *url.URL) OAuth2Strategy
+
+	// Setup the OAuth2 client
+	OAuth2Setup(token oauth2.TokenSource) error
+}