Chore: project init

internal/auth/service.go

@@ -0,0 +1,66 @@
+package auth
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"a301_server/pkg/config"
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/redis/go-redis/v9"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type Claims struct {
+	UserID   uint   `json:"user_id"`
+	Username string `json:"username"`
+	Role     string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+type Service struct {
+	repo *Repository
+	rdb  *redis.Client
+}
+
+func NewService(repo *Repository, rdb *redis.Client) *Service {
+	return &Service{repo: repo, rdb: rdb}
+}
+
+func (s *Service) Login(username, password string) (string, *User, error) {
+	user, err := s.repo.FindByUsername(username)
+	if err != nil {
+		return "", nil, fmt.Errorf("아이디 또는 비밀번호가 올바르지 않습니다")
+	}
+
+	if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password)); err != nil {
+		return "", nil, fmt.Errorf("아이디 또는 비밀번호가 올바르지 않습니다")
+	}
+
+	expiry := time.Duration(config.C.JWTExpiryHours) * time.Hour
+	claims := &Claims{
+		UserID:   user.ID,
+		Username: user.Username,
+		Role:     string(user.Role),
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(expiry)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	tokenStr, err := token.SignedString([]byte(config.C.JWTSecret))
+	if err != nil {
+		return "", nil, fmt.Errorf("토큰 생성에 실패했습니다")
+	}
+
+	// Redis에 세션 저장 (1계정 1세션)
+	key := fmt.Sprintf("session:%d", user.ID)
+	s.rdb.Set(context.Background(), key, tokenStr, expiry)
+
+	return tokenStr, user, nil
+}
+
+func (s *Service) Logout(userID uint) {
+	key := fmt.Sprintf("session:%d", userID)
+	s.rdb.Del(context.Background(), key)
+}