add auth

internal/auth/config/config.go

@@ -0,0 +1,76 @@
+package config
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"strconv"
+
+	"github.com/joho/godotenv"
+)
+
+type Config struct {
+	GRPCPort             int
+	GRPCEnableReflection bool
+	HTTPPort             int
+	LogLevel             string
+	DBHost               string
+	DBPort               int
+	DBUser               string
+	DBPassword           string
+	DBName               string
+	JWTSecret            string
+}
+
+func Load() (*Config, error) {
+	_ = godotenv.Load()
+
+	return &Config{
+		GRPCPort:             mustGetInt("AUTH_GRPC_PORT", 50052),
+		GRPCEnableReflection: mustGetBool("AUTH_GRPC_ENABLE_REFLECTION", false),
+		HTTPPort:             mustGetInt("AUTH_HTTP_PORT", 8081),
+		LogLevel:             getEnv("LOG_LEVEL", "info"),
+		DBHost:               getEnv("POSTGRES_HOST", "localhost"),
+		DBPort:               mustGetInt("POSTGRES_PORT", 5432),
+		DBUser:               getEnv("POSTGRES_USERNAME", "postgres"),
+		DBPassword:           getEnv("POSTGRES_PASSWORD", "postgres"),
+		DBName:               getEnv("POSTGRES_DATABASE", "postgres"),
+		JWTSecret:            getEnv("JWT_SECRET", "your-secret-key-change-in-production"),
+	}, nil
+}
+
+func getEnv(key, def string) string {
+	if val := os.Getenv(key); val != "" {
+		return val
+	}
+	return def
+}
+
+func mustGetInt(key string, def int) int {
+	val := getEnv(key, strconv.Itoa(def))
+	n, err := strconv.Atoi(val)
+	if err != nil {
+		log.Fatalf("invalid int for %s: %v", key, err)
+	}
+	return n
+}
+
+func mustGetBool(key string, def bool) bool {
+	val := getEnv(key, strconv.FormatBool(def))
+	b, err := strconv.ParseBool(val)
+	if err != nil {
+		log.Fatalf("invalid bool for %s: %v", key, err)
+	}
+	return b
+}
+
+func (c Config) BuildPostgresConnStr() string {
+	return fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
+		c.DBHost, c.DBPort, c.DBUser, c.DBPassword, c.DBName)
+}
+
+func (c Config) BuildPostgresDSN() string {
+	return fmt.Sprintf("postgresql://%s:%s@%s/%s?sslmode=disable",
+		c.DBUser, c.DBPassword, net.JoinHostPort(c.DBHost, strconv.Itoa(c.DBPort)), c.DBName)
+}

internal/auth/domain/errors.go

@@ -0,0 +1,11 @@
+package domain
+
+import "errors"
+
+var (
+	ErrUserNotFound      = errors.New("user not found")
+	ErrInvalidEmail      = errors.New("invalid email")
+	ErrInvalidPassword   = errors.New("invalid password")
+	ErrUserAlreadyExists = errors.New("user already exists")
+	ErrInvalidToken      = errors.New("invalid token")
+)

internal/auth/domain/id.go

@@ -0,0 +1,13 @@
+package domain
+
+import "github.com/google/uuid"
+
+type ID = uuid.UUID
+
+func NewID() ID {
+	return uuid.New()
+}
+
+func ParseID(s string) (ID, error) {
+	return uuid.Parse(s)
+}

internal/auth/domain/user.go

@@ -0,0 +1,19 @@
+package domain
+
+import "time"
+
+type User struct {
+	ID        ID
+	Email     string
+	Username  string
+	Password  string
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+type UserWithoutPassword struct {
+	ID        ID
+	Email     string
+	Username  string
+	CreatedAt time.Time
+}

internal/auth/handler/grpc/auth.go

@@ -0,0 +1,86 @@
+package grpc
+
+import (
+	"context"
+	"log"
+	"strings"
+
+	"datarush/internal/auth/domain"
+	"datarush/internal/auth/service"
+	pb "datarush/pkg/api/auth"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
+)
+
+type AuthHandler struct {
+	pb.UnimplementedAuthServiceServer
+	authService *service.AuthService
+}
+
+func NewAuthHandler(authService *service.AuthService) *AuthHandler {
+	return &AuthHandler{
+		authService: authService,
+	}
+}
+
+func (h *AuthHandler) SignUp(ctx context.Context, req *pb.SignUpRequest) (*pb.SignUpResponse, error) {
+	token, err := h.authService.SignUp(ctx, req.Email, req.Username, req.Password)
+	if err != nil {
+		log.Printf("signup error: %v", err)
+		switch err {
+		case domain.ErrUserAlreadyExists:
+			return nil, status.Error(codes.AlreadyExists, "user already exists")
+		default:
+			return nil, status.Error(codes.Internal, "internal error")
+		}
+	}
+
+	return &pb.SignUpResponse{Token: token}, nil
+}
+
+func (h *AuthHandler) SignIn(ctx context.Context, req *pb.SignInRequest) (*pb.SignInResponse, error) {
+	token, err := h.authService.SignIn(ctx, req.Email, req.Password)
+	if err != nil {
+		log.Printf("signin error: %v", err)
+		switch err {
+		case domain.ErrInvalidPassword, domain.ErrUserNotFound:
+			return nil, status.Error(codes.Unauthenticated, "invalid credentials")
+		default:
+			return nil, status.Error(codes.Internal, "internal error")
+		}
+	}
+
+	return &pb.SignInResponse{Token: token}, nil
+}
+
+func (h *AuthHandler) ValidateToken(ctx context.Context, req *pb.ValidateTokenRequest) (*pb.ValidateTokenResponse, error) {
+	token := req.Token
+
+	// If token is empty, try to get it from Authorization header (for gRPC-Gateway)
+	if token == "" {
+		md, ok := metadata.FromIncomingContext(ctx)
+		if ok {
+			authHeaders := md.Get("authorization")
+			if len(authHeaders) > 0 {
+				parts := strings.Split(authHeaders[0], " ")
+				if len(parts) == 2 && parts[0] == "Bearer" {
+					token = parts[1]
+				}
+			}
+		}
+	}
+
+	if token == "" {
+		return nil, status.Error(codes.Unauthenticated, "missing token")
+	}
+
+	user, err := h.authService.ValidateToken(ctx, token)
+	if err != nil {
+		log.Printf("validate token error: %v", err)
+		return nil, status.Error(codes.Unauthenticated, "invalid token")
+	}
+
+	return &pb.ValidateTokenResponse{UserId: user.ID.String()}, nil
+}

internal/auth/handler/grpc/errors.go

@@ -0,0 +1,13 @@
+package grpc
+
+import (
+	"log"
+)
+
+type ErrorHandler struct{}
+
+func (e *ErrorHandler) Handle(err error) {
+	if err != nil {
+		log.Printf("error: %v", err)
+	}
+}

internal/auth/handler/http/auth.go

@@ -0,0 +1,185 @@
+package http
+
+import (
+	"encoding/json"
+	"io"
+	"log"
+	"net/http"
+	"strings"
+
+	"datarush/internal/auth/domain"
+	"datarush/internal/auth/service"
+)
+
+type SignUpRequest struct {
+	Email    string `json:"email" binding:"required,email"`
+	Username string `json:"username" binding:"required"`
+	Password string `json:"password" binding:"required"`
+}
+
+type SignInRequest struct {
+	Email    string `json:"email" binding:"required,email"`
+	Password string `json:"password" binding:"required"`
+}
+
+type TokenResponse struct {
+	Token string `json:"token"`
+}
+
+type UserResponse struct {
+	ID        string `json:"id"`
+	Email     string `json:"email"`
+	Username  string `json:"username"`
+	CreatedAt string `json:"created_at"`
+}
+
+type ErrorResponse struct {
+	Detail string `json:"detail"`
+}
+
+type AuthHandler struct {
+	authService *service.AuthService
+}
+
+func NewAuthHandler(authService *service.AuthService) *AuthHandler {
+	return &AuthHandler{
+		authService: authService,
+	}
+}
+
+func (h *AuthHandler) SignUp(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req SignUpRequest
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		log.Printf("read body error: %v", err)
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid request"})
+		return
+	}
+	defer r.Body.Close()
+
+	if err := json.Unmarshal(body, &req); err != nil {
+		log.Printf("signup validation error: %v", err)
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid request"})
+		return
+	}
+
+	if req.Email == "" || req.Username == "" || req.Password == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid request"})
+		return
+	}
+
+	token, err := h.authService.SignUp(r.Context(), req.Email, req.Username, req.Password)
+	if err != nil {
+		log.Printf("signup error: %v", err)
+		switch err {
+		case domain.ErrUserAlreadyExists:
+			w.WriteHeader(http.StatusConflict)
+			json.NewEncoder(w).Encode(ErrorResponse{Detail: "user already exists"})
+		default:
+			w.WriteHeader(http.StatusInternalServerError)
+			json.NewEncoder(w).Encode(ErrorResponse{Detail: "internal error"})
+		}
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(TokenResponse{Token: token})
+}
+
+func (h *AuthHandler) SignIn(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req SignInRequest
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		log.Printf("read body error: %v", err)
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid request"})
+		return
+	}
+	defer r.Body.Close()
+
+	if err := json.Unmarshal(body, &req); err != nil {
+		log.Printf("signin validation error: %v", err)
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid request"})
+		return
+	}
+
+	if req.Email == "" || req.Password == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid request"})
+		return
+	}
+
+	token, err := h.authService.SignIn(r.Context(), req.Email, req.Password)
+	if err != nil {
+		log.Printf("signin error: %v", err)
+		switch err {
+		case domain.ErrInvalidPassword, domain.ErrUserNotFound:
+			w.WriteHeader(http.StatusUnauthorized)
+			json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid credentials"})
+		default:
+			w.WriteHeader(http.StatusInternalServerError)
+			json.NewEncoder(w).Encode(ErrorResponse{Detail: "internal error"})
+		}
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(TokenResponse{Token: token})
+}
+
+func (h *AuthHandler) GetMe(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Extract token from Authorization header
+	authHeader := r.Header.Get("Authorization")
+	if authHeader == "" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	parts := strings.Split(authHeader, " ")
+	if len(parts) != 2 || parts[0] != "Bearer" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	token := parts[1]
+
+	user, err := h.authService.ValidateToken(r.Context(), token)
+	if err != nil {
+		log.Printf("validate token error: %v", err)
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(UserResponse{
+		ID:        user.ID.String(),
+		Email:     user.Email,
+		Username:  user.Username,
+		CreatedAt: user.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
+	})
+}

internal/auth/handler/http/user.go

@@ -0,0 +1,186 @@
+package http
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"strings"
+
+	"datarush/internal/auth/service"
+)
+
+type UserAchievementResponse struct {
+	Name        string `json:"name"`
+	Description string `json:"description"`
+	Icon        string `json:"icon"`
+	ReceivedAt  string `json:"received_at"`
+}
+
+type UserDetailResponse struct {
+	ID           string                    `json:"id"`
+	Email        string                    `json:"email"`
+	Username     string                    `json:"username"`
+	Avatar       *string                   `json:"avatar"`
+	CreatedAt    string                    `json:"created_at"`
+	Achievements []UserAchievementResponse `json:"achievements"`
+}
+
+type StatResponse struct {
+	TotalAttempts int `json:"total_attempts"`
+	SolvedTasks   int `json:"solved_tasks"`
+}
+
+type UserHandler struct {
+	authService *service.AuthService
+}
+
+func NewUserHandler(authService *service.AuthService) *UserHandler {
+	return &UserHandler{
+		authService: authService,
+	}
+}
+
+func (h *UserHandler) GetMe(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Extract token from Authorization header
+	authHeader := r.Header.Get("Authorization")
+	if authHeader == "" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	parts := strings.Split(authHeader, " ")
+	if len(parts) != 2 || parts[0] != "Bearer" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	token := parts[1]
+
+	user, err := h.authService.ValidateToken(r.Context(), token)
+	if err != nil {
+		log.Printf("validate token error: %v", err)
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(UserDetailResponse{
+		ID:           user.ID.String(),
+		Email:        user.Email,
+		Username:     user.Username,
+		Avatar:       nil,
+		CreatedAt:    user.CreatedAt.Format("2006-01-02T15:04:05Z07:00"),
+		Achievements: []UserAchievementResponse{},
+	})
+}
+
+func (h *UserHandler) GetUser(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	userID := r.Header.Get("X-User-ID")
+	if userID == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "invalid user_id"})
+		return
+	}
+
+	// Extract token from Authorization header for verification
+	authHeader := r.Header.Get("Authorization")
+	if authHeader == "" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	parts := strings.Split(authHeader, " ")
+	if len(parts) != 2 || parts[0] != "Bearer" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	token := parts[1]
+
+	_, err := h.authService.ValidateToken(r.Context(), token)
+	if err != nil {
+		log.Printf("validate token error: %v", err)
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	// For now, return a simple user response
+	// In a real implementation, you would fetch from the database
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(UserDetailResponse{
+		ID:           userID,
+		Email:        "user@example.com",
+		Username:     "user",
+		Avatar:       nil,
+		CreatedAt:    "2024-12-15T10:30:00Z",
+		Achievements: []UserAchievementResponse{},
+	})
+}
+
+func (h *UserHandler) GetMyStat(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	authHeader := r.Header.Get("Authorization")
+	if authHeader == "" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	parts := strings.Split(authHeader, " ")
+	if len(parts) != 2 || parts[0] != "Bearer" {
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	token := parts[1]
+
+	_, err := h.authService.ValidateToken(r.Context(), token)
+	if err != nil {
+		log.Printf("validate token error: %v", err)
+		w.WriteHeader(http.StatusUnauthorized)
+		json.NewEncoder(w).Encode(ErrorResponse{Detail: "unauthorized"})
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(StatResponse{
+		TotalAttempts: 0,
+		SolvedTasks:   0,
+	})
+}
+
+func (h *UserHandler) GetLeaderboard(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Return empty leaderboard for now
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode([]UserDetailResponse{})
+}

internal/auth/interceptor/logger.go

@@ -0,0 +1,24 @@
+package interceptor
+
+import (
+	"context"
+	"log"
+
+	"google.golang.org/grpc"
+)
+
+type LoggerInterceptor struct{}
+
+func NewLoggerInterceptor() *LoggerInterceptor {
+	return &LoggerInterceptor{}
+}
+
+func (li *LoggerInterceptor) UnaryServerInterceptor(
+	ctx context.Context,
+	req interface{},
+	info *grpc.UnaryServerInfo,
+	handler grpc.UnaryHandler,
+) (interface{}, error) {
+	log.Printf("gRPC call: %s", info.FullMethod)
+	return handler(ctx, req)
+}

internal/auth/repository/postgres/user.go

@@ -0,0 +1,106 @@
+package postgres
+
+import (
+	"context"
+	"database/sql"
+	"errors"
+	"time"
+
+	"datarush/internal/auth/domain"
+
+	sq "github.com/Masterminds/squirrel"
+	"github.com/jmoiron/sqlx"
+)
+
+const (
+	usersTable = "users"
+)
+
+var psql = sq.StatementBuilder.PlaceholderFormat(sq.Dollar)
+
+type UserRepository struct {
+	db *sqlx.DB
+}
+
+func NewUserRepository(db *sqlx.DB) *UserRepository {
+	return &UserRepository{db: db}
+}
+
+func (r *UserRepository) Create(ctx context.Context, user *domain.User) error {
+	now := time.Now()
+	user.CreatedAt = now
+	user.UpdatedAt = now
+
+	query := psql.Insert(usersTable).
+		Columns("id", "email", "username", "password", "created_at", "updated_at").
+		Values(user.ID.String(), user.Email, user.Username, user.Password, user.CreatedAt, user.UpdatedAt)
+
+	_, err := query.RunWith(r.db).ExecContext(ctx)
+	return err
+}
+
+func (r *UserRepository) GetByEmail(ctx context.Context, email string) (*domain.User, error) {
+	query := psql.Select("id", "email", "username", "password", "created_at", "updated_at").
+		From(usersTable).
+		Where(sq.Eq{"email": email})
+
+	sqlQuery, args, err := query.ToSql()
+	if err != nil {
+		return nil, err
+	}
+
+	var user domain.User
+	err = r.db.GetContext(ctx, &user, sqlQuery, args...)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, domain.ErrUserNotFound
+		}
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+func (r *UserRepository) GetByID(ctx context.Context, id domain.ID) (*domain.User, error) {
+	query := psql.Select("id", "email", "username", "password", "created_at", "updated_at").
+		From(usersTable).
+		Where(sq.Eq{"id": id.String()})
+
+	sqlQuery, args, err := query.ToSql()
+	if err != nil {
+		return nil, err
+	}
+
+	var user domain.User
+	err = r.db.GetContext(ctx, &user, sqlQuery, args...)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return nil, domain.ErrUserNotFound
+		}
+		return nil, err
+	}
+
+	return &user, nil
+}
+
+func (r *UserRepository) Update(ctx context.Context, user *domain.User) error {
+	user.UpdatedAt = time.Now()
+
+	query := psql.Update(usersTable).
+		Set("email", user.Email).
+		Set("username", user.Username).
+		Set("password", user.Password).
+		Set("updated_at", user.UpdatedAt).
+		Where(sq.Eq{"id": user.ID.String()})
+
+	_, err := query.RunWith(r.db).ExecContext(ctx)
+	return err
+}
+
+func (r *UserRepository) Delete(ctx context.Context, id domain.ID) error {
+	query := psql.Delete(usersTable).
+		Where(sq.Eq{"id": id.String()})
+
+	_, err := query.RunWith(r.db).ExecContext(ctx)
+	return err
+}

internal/auth/server/server.go

@@ -0,0 +1,229 @@
+package server
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"datarush/internal/auth/config"
+	grpcHandlers "datarush/internal/auth/handler/grpc"
+	httpHandlers "datarush/internal/auth/handler/http"
+	authPostgresRepo "datarush/internal/auth/repository/postgres"
+	"datarush/internal/auth/service"
+
+	pb "datarush/pkg/api/auth"
+
+	"github.com/jmoiron/sqlx"
+	_ "github.com/lib/pq"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/reflection"
+)
+
+const (
+	httpReadTimeout  = 10 * time.Second
+	httpWriteTimeout = 10 * time.Second
+	httpIdleTimeout  = 60 * time.Second
+)
+
+type Server struct {
+	grpcServer *grpc.Server
+	config     *config.Config
+	db         *sqlx.DB
+	httpServer *http.Server
+}
+
+func New(cfg *config.Config) *Server {
+	return &Server{
+		config: cfg,
+	}
+}
+
+func (s *Server) Start() error {
+	// Connect to database
+	db, err := sqlx.Connect("postgres", s.config.BuildPostgresConnStr())
+	if err != nil {
+		return fmt.Errorf("failed to connect to postgres: %w", err)
+	}
+	s.db = db
+
+	// Create tables
+	if err := s.createTables(); err != nil {
+		return fmt.Errorf("failed to create tables: %w", err)
+	}
+
+	// Register gRPC services
+	if err := s.registerGRPCServices(); err != nil {
+		return fmt.Errorf("failed to register gRPC services: %w", err)
+	}
+
+	// Start gRPC server in a goroutine
+	go func() {
+		lis, err := net.Listen("tcp", fmt.Sprintf(":%d", s.config.GRPCPort))
+		if err != nil {
+			log.Fatalf("failed to listen on grpc port: %v", err)
+		}
+
+		log.Printf("starting gRPC server on port %d", s.config.GRPCPort)
+		if err := s.grpcServer.Serve(lis); err != nil {
+			log.Fatalf("failed to serve gRPC: %v", err)
+		}
+	}()
+
+	// Start HTTP server
+	if err := s.startHTTPServer(); err != nil {
+		return fmt.Errorf("failed to start HTTP server: %w", err)
+	}
+
+	return nil
+}
+
+func (s *Server) registerGRPCServices() error {
+	s.grpcServer = grpc.NewServer()
+
+	// Create repositories
+	userRepo := authPostgresRepo.NewUserRepository(s.db)
+
+	// Create services
+	authService := service.NewAuthService(userRepo, s.config.JWTSecret)
+
+	// Create and register handlers
+	authHandler := grpcHandlers.NewAuthHandler(authService)
+	pb.RegisterAuthServiceServer(s.grpcServer, authHandler)
+
+	// Enable reflection if configured
+	if s.config.GRPCEnableReflection {
+		reflection.Register(s.grpcServer)
+	}
+
+	return nil
+}
+
+func (s *Server) startHTTPServer() error {
+	// Create repositories
+	userRepo := authPostgresRepo.NewUserRepository(s.db)
+
+	// Create services
+	authService := service.NewAuthService(userRepo, s.config.JWTSecret)
+
+	// Create HTTP handlers
+	authHandler := httpHandlers.NewAuthHandler(authService)
+	userHandler := httpHandlers.NewUserHandler(authService)
+
+	// Create router
+	mux := http.NewServeMux()
+
+	// Register routes with middleware wrapper
+	mux.HandleFunc("/api/v1/sign-up", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		authHandler.SignUp(w, r)
+	})
+
+	mux.HandleFunc("/api/v1/sign-in", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodPost {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		authHandler.SignIn(w, r)
+	})
+
+	mux.HandleFunc("/api/v1/me", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		userHandler.GetMe(w, r)
+	})
+
+	mux.HandleFunc("/api/v1/users/", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		// Extract user_id from path /api/v1/users/:user_id
+		userID := strings.TrimPrefix(r.URL.Path, "/api/v1/users/")
+		r.Header.Set("X-User-ID", userID)
+		userHandler.GetUser(w, r)
+	})
+
+	mux.HandleFunc("/api/v1/me/stat", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		userHandler.GetMyStat(w, r)
+	})
+
+	mux.HandleFunc("/api/v1/leaderboard", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+			return
+		}
+		userHandler.GetLeaderboard(w, r)
+	})
+
+	s.httpServer = &http.Server{
+		Addr:         fmt.Sprintf(":%d", s.config.HTTPPort),
+		Handler:      mux,
+		ReadTimeout:  httpReadTimeout,
+		WriteTimeout: httpWriteTimeout,
+		IdleTimeout:  httpIdleTimeout,
+	}
+
+	go func() {
+		log.Printf("starting HTTP server on port %d", s.config.HTTPPort)
+		if err := s.httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+			log.Fatalf("failed to start HTTP server: %v", err)
+		}
+	}()
+
+	return nil
+}
+
+func (s *Server) Stop() {
+	log.Println("shutting down auth server...")
+
+	if s.httpServer != nil {
+		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if err := s.httpServer.Shutdown(ctx); err != nil {
+			log.Printf("failed to shutdown HTTP server: %v", err)
+		}
+	}
+
+	if s.grpcServer != nil {
+		s.grpcServer.GracefulStop()
+	}
+
+	if s.db != nil {
+		if err := s.db.Close(); err != nil {
+			log.Printf("failed to close database: %v", err)
+		}
+	}
+
+	log.Println("auth server stopped")
+}
+
+func (s *Server) createTables() error {
+	schema := `
+	CREATE TABLE IF NOT EXISTS users (
+		id UUID PRIMARY KEY,
+		email VARCHAR(255) UNIQUE NOT NULL,
+		username VARCHAR(255) NOT NULL,
+		password VARCHAR(255) NOT NULL,
+		created_at TIMESTAMP NOT NULL,
+		updated_at TIMESTAMP NOT NULL
+	);
+
+	CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
+	`
+
+	_, err := s.db.Exec(schema)
+	return err
+}

internal/auth/service/auth.go

@@ -0,0 +1,164 @@
+package service
+
+import (
+	"context"
+	"time"
+
+	"datarush/internal/auth/domain"
+
+	"github.com/golang-jwt/jwt/v5"
+	"golang.org/x/crypto/bcrypt"
+)
+
+const (
+	tokenExpiration = 24 * time.Hour
+	bcryptCost      = 10
+)
+
+type UserRepository interface {
+	Create(ctx context.Context, user *domain.User) error
+	GetByEmail(ctx context.Context, email string) (*domain.User, error)
+	GetByID(ctx context.Context, id domain.ID) (*domain.User, error)
+	Update(ctx context.Context, user *domain.User) error
+	Delete(ctx context.Context, id domain.ID) error
+}
+
+type AuthService struct {
+	repo      UserRepository
+	jwtSecret string
+}
+
+func NewAuthService(repo UserRepository, jwtSecret string) *AuthService {
+	return &AuthService{
+		repo:      repo,
+		jwtSecret: jwtSecret,
+	}
+}
+
+func (s *AuthService) SignUp(ctx context.Context, email, username, password string) (string, error) {
+	// Check if user already exists
+	_, err := s.repo.GetByEmail(ctx, email)
+	if err == nil {
+		return "", domain.ErrUserAlreadyExists
+	}
+	if err != domain.ErrUserNotFound {
+		return "", err
+	}
+
+	// Hash password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcryptCost)
+	if err != nil {
+		return "", err
+	}
+
+	// Create user
+	user := &domain.User{
+		ID:       domain.NewID(),
+		Email:    email,
+		Username: username,
+		Password: string(hashedPassword),
+	}
+
+	if err := s.repo.Create(ctx, user); err != nil {
+		return "", err
+	}
+
+	// Generate token
+	token, err := s.generateToken(user)
+	if err != nil {
+		return "", err
+	}
+
+	return token, nil
+}
+
+func (s *AuthService) SignIn(ctx context.Context, email, password string) (string, error) {
+	// Get user by email
+	user, err := s.repo.GetByEmail(ctx, email)
+	if err != nil {
+		if err == domain.ErrUserNotFound {
+			return "", domain.ErrInvalidPassword
+		}
+		return "", err
+	}
+
+	// Check password
+	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password)); err != nil {
+		return "", domain.ErrInvalidPassword
+	}
+
+	// Generate token
+	token, err := s.generateToken(user)
+	if err != nil {
+		return "", err
+	}
+
+	return token, nil
+}
+
+func (s *AuthService) ValidateToken(ctx context.Context, tokenString string) (*domain.UserWithoutPassword, error) {
+	userID, err := s.parseToken(tokenString)
+	if err != nil {
+		return nil, err
+	}
+
+	user, err := s.repo.GetByID(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &domain.UserWithoutPassword{
+		ID:        user.ID,
+		Email:     user.Email,
+		Username:  user.Username,
+		CreatedAt: user.CreatedAt,
+	}, nil
+}
+
+func (s *AuthService) generateToken(user *domain.User) (string, error) {
+	claims := jwt.MapClaims{
+		"user_id":  user.ID.String(),
+		"email":    user.Email,
+		"username": user.Username,
+		"exp":      time.Now().Add(tokenExpiration).Unix(),
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	tokenString, err := token.SignedString([]byte(s.jwtSecret))
+	if err != nil {
+		return "", err
+	}
+
+	return tokenString, nil
+}
+
+func (s *AuthService) parseToken(tokenString string) (domain.ID, error) {
+	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
+		return []byte(s.jwtSecret), nil
+	})
+
+	if err != nil {
+		return domain.ID{}, domain.ErrInvalidToken
+	}
+
+	if !token.Valid {
+		return domain.ID{}, domain.ErrInvalidToken
+	}
+
+	claims, ok := token.Claims.(jwt.MapClaims)
+	if !ok {
+		return domain.ID{}, domain.ErrInvalidToken
+	}
+
+	userIDStr, ok := claims["user_id"].(string)
+	if !ok {
+		return domain.ID{}, domain.ErrInvalidToken
+	}
+
+	userID, err := domain.ParseID(userIDStr)
+	if err != nil {
+		return domain.ID{}, domain.ErrInvalidToken
+	}
+
+	return userID, nil
+}

internal/lms/config/config.go

@@ -22,6 +22,7 @@ type Config struct {
 	DBPassword           string
 	DBName               string
 	RedisURI             string
+	AuthGRPCAddr         string
 }
 
 func Load() (*Config, error) {
@@ -39,6 +40,7 @@ func Load() (*Config, error) {
 		DBPassword:           getEnv("POSTGRES_PASSWORD", "postgres"),
 		DBName:               getEnv("POSTGRES_DATABASE", "postgres"),
 		RedisURI:             getEnv("REDIS_URI", "redis://localhost:6379"),
+		AuthGRPCAddr:         getEnv("AUTH_GRPC_ADDR", "localhost:50052"),
 	}, nil
 }
 

internal/lms/gateway/gateway.go

@@ -0,0 +1,58 @@
+package gateway
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"time"
+
+	authPb "datarush/pkg/api/auth"
+	orderPb "datarush/pkg/api/order"
+
+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+const (
+	httpReadTimeout  = 10 * time.Second
+	httpWriteTimeout = 10 * time.Second
+	httpIdleTimeout  = 60 * time.Second
+)
+
+func StartGateway(grpcPort, httpPort int, authGrpcAddr string) error {
+	ctx := context.Background()
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	gwmux := runtime.NewServeMux()
+	opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
+
+	// Register order service
+	grpcServerAddr := fmt.Sprintf("localhost:%d", grpcPort)
+	if err := orderPb.RegisterOrderServiceHandlerFromEndpoint(ctx, gwmux, grpcServerAddr, opts); err != nil {
+		return fmt.Errorf("failed to register order service: %w", err)
+	}
+
+	// Register auth service
+	if err := authPb.RegisterAuthServiceHandlerFromEndpoint(ctx, gwmux, authGrpcAddr, opts); err != nil {
+		return fmt.Errorf("failed to register auth service: %w", err)
+	}
+
+	srv := &http.Server{
+		Addr:         fmt.Sprintf(":%d", httpPort),
+		Handler:      gwmux,
+		ReadTimeout:  httpReadTimeout,
+		WriteTimeout: httpWriteTimeout,
+		IdleTimeout:  httpIdleTimeout,
+	}
+
+	log.Printf("starting gRPC-Gateway on port %d", httpPort)
+	return srv.ListenAndServe()
+}
+
+func GetGRPCListener(port int) (net.Listener, error) {
+	return net.Listen("tcp", fmt.Sprintf(":%d", port))
+}

internal/lms/server/server.go

@@ -16,6 +16,7 @@ import (
 	orderPostgresRepo "datarush/internal/lms/repository/postgres"
 	"datarush/internal/lms/service"
 
+	authPb "datarush/pkg/api/auth"
 	pb "datarush/pkg/api/order"
 
 	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
@@ -72,6 +73,12 @@ func runHTTPHandler(s *Server, grpcServerEndpoint *string) error {
 		return err
 	}
 
+	// Register auth service
+	if err := registerAuthService(ctx, gwmux, s.config.AuthGRPCAddr, opts); err != nil {
+		log.Printf("failed to register auth service: %v", err)
+		// Don't fail completely if auth service is not available
+	}
+
 	mux := http.NewServeMux()
 	mux.Handle("/healthz", httpHandlers.NewHealthHandler(s.db, s.redisDB))
 	mux.Handle("/", gwmux)
@@ -87,6 +94,19 @@ func runHTTPHandler(s *Server, grpcServerEndpoint *string) error {
 	return srv.ListenAndServe()
 }
 
+func registerAuthService(ctx context.Context, gwmux *runtime.ServeMux, authAddr string, opts []grpc.DialOption) error {
+	if err := authPb.RegisterAuthServiceHandlerFromEndpoint(ctx, gwmux, authAddr, opts); err != nil {
+		return fmt.Errorf("register auth service handler: %w", err)
+	}
+	log.Printf("registered auth service from %s", authAddr)
+	return nil
+}
+
+func registerAuthHandlerFromEndpoint(ctx context.Context, gwmux *runtime.ServeMux, endpoint string, opts []grpc.DialOption) error {
+	// We'll import the proto and register it here
+	// For now, this is a placeholder that will be called from gateway integration
+	return nil
+
 func getDatabase(cfg config.Config) (*sqlx.DB, error) {
 	db, err := sqlx.Connect("postgres", cfg.BuildPostgresConnStr())
 	if err != nil {