refac: remove frontend & clearer DDD

api/handlers/auth/auth.go

@@ -0,0 +1,194 @@
+package auth
+
+import (
+	"RenewCMS/api/pkg/apperr"
+	validator "RenewCMS/api/pkg/validator"
+	"RenewCMS/internal/domain/user"
+	"RenewCMS/internal/infrastructure/useCases"
+	"encoding/json"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/go-chi/jwtauth/v5"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type Handler struct {
+	Token         *jwtauth.JWTAuth
+	GetUseCase    *useCases.GetUserUseCase
+	ListUseCase   *useCases.ListUsersUseCase
+	CreateUseCase *useCases.CreateUserUseCase
+}
+
+type RegisterCredentials struct {
+	Username string `json:"username" validate:"required,min=3,max=20"`
+	Password string `json:"password" validate:"required,min=8"`
+	Email    string `json:"email" validate:"required,email"`
+}
+
+type LoginCredentials struct {
+	Username string `json:"username" validate:"required,min=3,max=20"`
+	Password string `json:"password" validate:"required,min=8"`
+}
+
+var shouldCookieBeSecure = os.Getenv("ENVIRONMENT") == "production"
+
+func removeJwtCookie(w http.ResponseWriter) {
+	http.SetCookie(w, &http.Cookie{
+		Name:     "jwt",
+		Value:    "",
+		Expires:  time.Now(),
+		MaxAge:   -1,
+		Secure:   shouldCookieBeSecure,
+		HttpOnly: true,
+		Path:     "/",
+	})
+}
+
+func NewHandler(token *jwtauth.JWTAuth, get *useCases.GetUserUseCase, list *useCases.ListUsersUseCase, create *useCases.CreateUserUseCase) *Handler {
+	return &Handler{
+		Token:         token,
+		GetUseCase:    get,
+		ListUseCase:   list,
+		CreateUseCase: create,
+	}
+}
+
+func (h *Handler) SetJwtCookie(w *http.ResponseWriter, userId uint32) error {
+	_, tokenString, err := h.Token.Encode(map[string]any{"user_id": userId})
+	if err != nil {
+		return err
+	}
+	http.SetCookie(*w, &http.Cookie{
+		Name:     "jwt",
+		Value:    tokenString,
+		Expires:  time.Now().Add(24 * time.Hour),
+		Secure:   shouldCookieBeSecure,
+		HttpOnly: true,
+		Path:     "/",
+	})
+	return nil
+}
+
+func (h *Handler) SomeUsersVerified() bool {
+	users := h.ListUseCase.ListUsers()
+	for _, localUser := range users {
+		if localUser.IsVerified {
+			return true
+		}
+	}
+	return false
+}
+
+func (h *Handler) IsUserTableEmpty() bool {
+	users := h.ListUseCase.ListUsers()
+	return len(users) == 0
+}
+
+func (h *Handler) IsLoggedIn(r *http.Request) bool {
+	token, err := jwtauth.VerifyRequest(
+		h.Token,
+		r,
+		jwtauth.TokenFromCookie,
+		jwtauth.TokenFromHeader,
+		jwtauth.TokenFromQuery)
+	return token != nil && err == nil
+}
+
+func (h *Handler) IsVerified(r *http.Request) bool {
+	token, err := jwtauth.VerifyRequest(
+		h.Token,
+		r,
+		jwtauth.TokenFromCookie,
+		jwtauth.TokenFromHeader,
+		jwtauth.TokenFromQuery)
+	if err != nil {
+		return false
+	}
+	userId := token.PrivateClaims()["user_id"].(float64)
+	currentUser, _ := h.GetUseCase.GetUser(uint32(userId))
+	return currentUser.IsVerified
+}
+
+func (h *Handler) GetUserFromCredentials(credentials LoginCredentials) (user.User, error) {
+	dbUser, err := h.GetUseCase.GetUserByUsername(credentials.Username)
+	if err != nil {
+		return user.User{}, err
+	}
+
+	err = bcrypt.CompareHashAndPassword([]byte(dbUser.Password), []byte(credentials.Password))
+	if err != nil {
+		return user.User{}, err
+	}
+
+	return dbUser, nil
+}
+
+func (h *Handler) Login(w http.ResponseWriter, r *http.Request) {
+	var credentials LoginCredentials
+
+	err := json.NewDecoder(r.Body).Decode(&credentials)
+	if err != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	err = validator.Validate.Struct(credentials)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	dbUser, err := h.GetUserFromCredentials(credentials)
+	if err != nil {
+		http.Error(w, apperr.LogsErrorMessage, http.StatusForbidden)
+		return
+	}
+
+	_ = h.SetJwtCookie(&w, dbUser.ID)
+
+	message, _ := json.Marshal(map[string]any{"message": "User logged in! HTTPonly jwt cookie created"})
+	_, _ = w.Write(message)
+}
+
+func (h *Handler) Register(w http.ResponseWriter, r *http.Request) {
+	if !h.IsLoggedIn(r) && !h.SomeUsersVerified() {
+		http.Error(w, "You are not allowed to create a user. Log in or reset database.", http.StatusForbidden)
+		return
+	}
+
+	var credentials RegisterCredentials
+	err := json.NewDecoder(r.Body).Decode(&credentials)
+	if err != nil {
+		http.Error(w, apperr.BodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	err = validator.Validate.Struct(credentials)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	createdUser, err := h.CreateUseCase.CreateUser(useCases.CreateUserCommand{
+		Username: credentials.Username,
+		Password: credentials.Password,
+		Email:    credentials.Email,
+	})
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	_ = h.SetJwtCookie(&w, createdUser.ID)
+
+	message, _ := json.Marshal(map[string]any{"message": "User registered! HTTPonly jwt cookie created"})
+	_, _ = w.Write(message)
+}
+
+func (h *Handler) Logout(w http.ResponseWriter, _ *http.Request) {
+	removeJwtCookie(w)
+	message, _ := json.Marshal(map[string]any{"message": "User logged out! HTTPonly jwt cookie deleted"})
+	_, _ = w.Write(message)
+}