first commit

pkg/utils/auth.go

@@ -0,0 +1,82 @@
+package utils
+
+import (
+	"crypto/md5"
+	"crypto/sha256"
+	"encoding/hex"
+	"time"
+	"xboard-go/internal/config"
+
+	"github.com/golang-jwt/jwt/v5"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type Claims struct {
+	UserID int  `json:"user_id"`
+	IsAdmin bool `json:"is_admin"`
+	jwt.RegisteredClaims
+}
+
+func GenerateToken(userID int, isAdmin bool) (string, error) {
+	claims := Claims{
+		UserID:  userID,
+		IsAdmin: isAdmin,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(24 * 7 * time.Hour)), // 7 days
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(config.AppConfig.JWTSecret))
+}
+
+func VerifyToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		return []byte(config.AppConfig.JWTSecret), nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, jwt.ErrSignatureInvalid
+}
+
+func HashPassword(password string) (string, error) {
+	bytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	return string(bytes), err
+}
+
+func CheckPassword(password, hash string, algo, salt *string) bool {
+	if algo != nil {
+		switch *algo {
+		case "md5":
+			sum := md5.Sum([]byte(password))
+			return hex.EncodeToString(sum[:]) == hash
+		case "sha256":
+			sum := sha256.Sum256([]byte(password))
+			return hex.EncodeToString(sum[:]) == hash
+		case "md5salt":
+			sum := md5.Sum([]byte(password + stringValue(salt)))
+			return hex.EncodeToString(sum[:]) == hash
+		case "sha256salt":
+			sum := sha256.Sum256([]byte(password + stringValue(salt)))
+			return hex.EncodeToString(sum[:]) == hash
+		}
+	}
+
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return err == nil
+}
+
+func stringValue(value *string) string {
+	if value == nil {
+		return ""
+	}
+	return *value
+}