v2.0: 3-Raum-System - Hauptraum, Saal A, Saal B mit 18 Tischen, Raum-Buchungen, API-Doku

backend/internal/auth/jwt.go

@@ -0,0 +1,53 @@
+package auth
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var jwtSecret []byte
+
+func InitJWTSecret(secret string) {
+	jwtSecret = []byte(secret)
+}
+
+type Claims struct {
+	Username string `json:"username"`
+	IsAdmin  bool   `json:"is_admin"`
+	jwt.RegisteredClaims
+}
+
+func GenerateToken(username string, isAdmin bool) (string, error) {
+	claims := Claims{
+		Username: username,
+		IsAdmin:  isAdmin,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(jwtSecret)
+}
+
+func ValidateToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("unexpected signing method")
+		}
+		return jwtSecret, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, errors.New("invalid token")
+}