feat: shortcut

Author: wolfogre

services/auth/shortcut.go

@@ -0,0 +1,52 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"net/http"
+
+	user_model "code.gitea.io/gitea/models/user"
+)
+
+// Shortcut is a group of verification methods that is like Group.
+// It tries each method in order and returns the first non-nil user,
+// but it never returns error even if some method returns error.
+// It is useful for some methods that share the same protocol, shortcut can check them first.
+// For example, OAuth2 and conan.Auth both read token from "Authorization: Bearer <token>" header,
+// If OAuth2 returns error, it is possible that the token is for conan.Auth but it has no chance to check.
+// And Shortcut solves this problem by:
+//
+//	NewGroup(
+//	    Shortcut{&OAuth2, &conan.Auth},
+//	    &OAuth2,
+//	    &auth.Basic{},
+//	    &nuget.Auth{},
+//	    &conan.Auth{},
+//	    &chef.Auth{},
+//	)
+//
+// Since Shortcut will set "AuthedMethod" in DataStore if any method returns non-nil user,
+// so it is unnecessary to implement Named interface for it, the "name" of Shortcut should never be stored as "AuthedMethod".
+type Shortcut []Method
+
+func (s Shortcut) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) (*user_model.User, error) {
+	for _, method := range s {
+		user, err := method.Verify(req, w, store, sess)
+		if err != nil {
+			// Don't return error, just try next method
+			continue
+		}
+
+		if user != nil {
+			if store.GetData()["AuthedMethod"] == nil {
+				if named, ok := method.(Named); ok {
+					store.GetData()["AuthedMethod"] = named.Name()
+				}
+			}
+			return user, nil
+		}
+	}
+
+	return nil, nil
+}