1 files changed, 72 insertions, 0 deletions
diff --git a/services/auth/group.go b/services/auth/group.go
new file mode 100644
index 0000000..aecf43c
--- /dev/null
+++ b/services/auth/group.go
@@ -0,0 +1,72 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package auth
+
+import (
+	"net/http"
+	"strings"
+
+	user_model "code.gitea.io/gitea/models/user"
+)
+
+// Ensure the struct implements the interface.
+var (
+	_ Method = &Group{}
+)
+
+// Group implements the Auth interface with serval Auth.
+type Group struct {
+	methods []Method
+}
+
+// NewGroup creates a new auth group
+func NewGroup(methods ...Method) *Group {
+	return &Group{
+		methods: methods,
+	}
+}
+
+// Add adds a new method to group
+func (b *Group) Add(method Method) {
+	b.methods = append(b.methods, method)
+}
+
+// Name returns group's methods name
+func (b *Group) Name() string {
+	names := make([]string, 0, len(b.methods))
+	for _, m := range b.methods {
+		names = append(names, m.Name())
+	}
+	return strings.Join(names, ",")
+}
+
+func (b *Group) Verify(req *http.Request, w http.ResponseWriter, store DataStore, sess SessionStore) (*user_model.User, error) {
+	// Try to sign in with each of the enabled plugins
+	var retErr error
+	for _, m := range b.methods {
+		user, err := m.Verify(req, w, store, sess)
+		if err != nil {
+			if retErr == nil {
+				retErr = err
+			}
+			// Try other methods if this one failed.
+			// Some methods may share the same protocol to detect if they are matched.
+			// For example, OAuth2 and conan.Auth both read token from "Authorization: Bearer <token>" header,
+			// If OAuth2 returns error, we should give conan.Auth a chance to try.
+			continue
+		}
+
+		// If any method returns a user, we can stop trying.
+		// Return the user and ignore any error returned by previous methods.
+		if user != nil {
+			if store.GetData()["AuthedMethod"] == nil {
+				store.GetData()["AuthedMethod"] = m.Name()
+			}
+			return user, nil
+		}
+	}
+
+	// If no method returns a user, return the error returned by the first method.
+	return nil, retErr
+}