feat: jwt and check

internal/auth/jwt.go

@@ -0,0 +1,54 @@
+// internal/auth/jwt.go
+package auth
+
+import (
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var secret = []byte("change-me-in-env")
+
+type Claims struct {
+	UserID   int64  `json:"user_id"`
+	Username string `json:"username"`
+	jwt.RegisteredClaims
+}
+
+func GenerateToken(userID int64, username string) (string, error) {
+	now := time.Now()
+
+	claims := Claims{
+		UserID:   userID,
+		Username: username,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(now.Add(24 * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(now),
+			NotBefore: jwt.NewNumericDate(now),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+
+	return token.SignedString(secret)
+}
+
+func ParseToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(
+		tokenString,
+		&Claims{},
+		func(token *jwt.Token) (interface{}, error) {
+			return secret, nil
+		},
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, jwt.ErrTokenInvalidClaims
+	}
+
+	return claims, nil
+}