Implement basic auth

internal/util/admins.go

@@ -0,0 +1,67 @@
+package util
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"sync"
+	"time"
+)
+
+type AdminSession struct {
+	Expiration time.Time
+	Username   string
+}
+
+var (
+	AdminSessions = make(map[string]AdminSession)
+	AdminMutex    = sync.RWMutex{}
+)
+
+func GenToken() (string, error) {
+	bytes := make([]byte, 32)
+	_, err := rand.Read(bytes)
+	if err != nil {
+		return "", err
+	}
+
+	return hex.EncodeToString(bytes), nil
+}
+
+func IsAdminSessionValid(token string) bool {
+	AdminMutex.RLock()
+	session, exists := AdminSessions[token]
+	AdminMutex.RUnlock()
+
+	if !exists || time.Now().After(session.Expiration) {
+		AdminMutex.Lock()
+		delete(AdminSessions, token)
+		AdminMutex.Unlock()
+		return false
+	}
+
+	return true
+}
+
+func CreateAdminSession(token string, session AdminSession) {
+	AdminMutex.Lock()
+	AdminSessions[token] = session
+	AdminMutex.Unlock()
+}
+
+func DeleteAdminSession(token string) {
+	AdminMutex.Lock()
+	delete(AdminSessions, token)
+	AdminMutex.Unlock()
+}
+
+func HasExistingAdminSession(username string) bool {
+	AdminMutex.RLock()
+	defer AdminMutex.RUnlock()
+	for _, session := range AdminSessions {
+		if session.Username == username {
+			return true
+		}
+	}
+
+	return false
+}