Add OpenAI Codex Multiplexer service

service/ocm/service_user.go

@@ -0,0 +1,29 @@
+package ocm
+
+import (
+	"sync"
+
+	"github.com/sagernet/sing-box/option"
+)
+
+type UserManager struct {
+	accessMutex sync.RWMutex
+	tokenMap    map[string]string
+}
+
+func (m *UserManager) UpdateUsers(users []option.OCMUser) {
+	m.accessMutex.Lock()
+	defer m.accessMutex.Unlock()
+	tokenMap := make(map[string]string, len(users))
+	for _, user := range users {
+		tokenMap[user.Token] = user.Name
+	}
+	m.tokenMap = tokenMap
+}
+
+func (m *UserManager) Authenticate(token string) (string, bool) {
+	m.accessMutex.RLock()
+	username, found := m.tokenMap[token]
+	m.accessMutex.RUnlock()
+	return username, found
+}