feat: users & authentication implementation

adapters/secondary/gateways/articleRepository.go

@@ -12,15 +12,18 @@ type ArticleRepository struct {
 }
 
 func NewArticleRepository(db *gorm.DB) *ArticleRepository {
-	a := ArticleRepository{db}
+	return &ArticleRepository{db}
-	return &a
+}
+
+func mapArticleToDomain(article entity.Article) domain.Article {
+	return domain.FromDb(article.ID, article.Title, article.Body, article.CreatedAt, article.UpdatedAt)
 }
 
 func (a *ArticleRepository) Get(id uint32) (domain.Article, error) {
-	var article domain.Article
+	var article entity.Article
 	err := a.db.Model(&entity.Article{}).First(&article, id).Error
 	if err != nil {
-		return article, err
+		return domain.Article{}, err
 	}
 
 	return domain.FromDb(article.ID, article.Title, article.Body, article.CreatedAt, article.UpdatedAt), nil
@@ -48,13 +51,18 @@ func (a *ArticleRepository) Create(article domain.Article) (domain.Article, erro
 }
 
 func (a *ArticleRepository) GetAll() []domain.Article {
-	var articles []domain.Article
+	var articles []entity.Article
 	err := a.db.Model(&entity.Article{}).Find(&articles).Error
 	if err != nil {
 		return []domain.Article{}
 	}
 
-	return articles
+	var domainArticles = make([]domain.Article, 0)
+	for _, article := range articles {
+		domainArticles = append(domainArticles, mapArticleToDomain(article))
+	}
+
+	return domainArticles
 }
 
 var _ IArticleRepository = &ArticleRepository{}

adapters/secondary/gateways/models/user.go

@@ -0,0 +1,16 @@
+package models
+
+import (
+	"gorm.io/gorm"
+	"time"
+)
+
+type User struct {
+	gorm.Model
+	ID        uint32    `gorm:"primaryKey;autoIncrement"`
+	Username  string    `gorm:"unique;not null"`
+	Password  string    `gorm:"not null"`
+	Email     string    `gorm:"unique;not null"`
+	CreatedAt time.Time `gorm:"autoCreateTime"`
+	UpdatedAt time.Time `gorm:"autoUpdateTime"`
+}

adapters/secondary/gateways/userRepository.go

@@ -0,0 +1,82 @@
+package gateways
+
+import (
+	entity "GohCMS2/adapters/secondary/gateways/models"
+	. "GohCMS2/domain/gateways"
+	domain "GohCMS2/domain/user"
+	"fmt"
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+)
+
+type UserRepository struct {
+	db *gorm.DB
+}
+
+func NewUserRepository(db *gorm.DB) *UserRepository {
+	return &UserRepository{db}
+}
+
+func mapUserToDomain(user entity.User) domain.User {
+	return domain.FromDb(user.ID, user.Username, user.Password, user.Email, user.CreatedAt, user.UpdatedAt)
+}
+
+func (u *UserRepository) Get(id uint32) (domain.User, error) {
+	var user entity.User
+	err := u.db.Model(&entity.User{}).First(&user, id).Error
+	if err != nil {
+		return domain.User{}, err
+	}
+
+	return mapUserToDomain(user), nil
+}
+
+func (u *UserRepository) Create(user domain.User) (domain.User, error) {
+	hashedPassword, _ := bcrypt.GenerateFromPassword([]byte(user.Password), 14)
+	fmt.Println("hashedPassword at register: ", string(hashedPassword))
+
+	creationResult := u.db.Create(&entity.User{
+		Username: user.Username,
+		Password: string(hashedPassword),
+		Email:    user.Email,
+	})
+	if creationResult.Error != nil {
+		return domain.User{}, creationResult.Error
+	}
+
+	var createdUser entity.User
+	creationResult.Scan(&createdUser)
+
+	return domain.FromDb(
+			createdUser.ID,
+			createdUser.Username,
+			createdUser.Password,
+			createdUser.Email,
+			createdUser.CreatedAt,
+			createdUser.UpdatedAt),
+		nil
+}
+
+func (u *UserRepository) GetAll() []domain.User {
+	var users []entity.User
+	u.db.Model(&entity.User{}).Find(&users)
+
+	var domainUsers []domain.User
+	for _, user := range users {
+		domainUsers = append(domainUsers, mapUserToDomain(user))
+	}
+
+	return domainUsers
+}
+
+func (u *UserRepository) GetByUsername(username string) (domain.User, error) {
+	var user entity.User
+	err := u.db.Model(&entity.User{}).Where("username = ?", username).First(&user).Error
+	if err != nil {
+		return domain.User{}, err
+	}
+
+	return mapUserToDomain(user), nil
+}
+
+var _ IUserRepository = &UserRepository{}

api/auth.go

@@ -0,0 +1,133 @@
+package api
+
+import (
+	"GohCMS2/useCases"
+	"encoding/json"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/jwtauth/v5"
+	"golang.org/x/crypto/bcrypt"
+	"net/http"
+	"time"
+)
+
+type UserRegister 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 UserLogin struct {
+	Username string `json:"username" validate:"required,min=3,max=20"`
+	Password string `json:"password" validate:"required,min=8"`
+}
+
+var TokenAuth *jwtauth.JWTAuth
+
+const logsErrorMessage = "Access to the requested resource is forbidden due to incorrect password and/or username."
+const bodyErrorMessage = "The request cannot be processed due to a mismatch in the format of the body."
+
+func SetJwtCookie(w *http.ResponseWriter, userId uint32) error {
+	_, tokenString, err := TokenAuth.Encode(map[string]interface{}{"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:   false, // TODO false in dev, true in prod
+		HttpOnly: true,
+		Path:     "/v1/",
+	})
+	return nil
+}
+
+func isAllowedToCreateUser() bool {
+	users := container.ListUsersUseCase.ListUsers()
+	return len(users) == 0
+}
+
+func isLoggedIn(r *http.Request) bool {
+	token, err := jwtauth.VerifyRequest(
+		TokenAuth,
+		r,
+		jwtauth.TokenFromCookie,
+		jwtauth.TokenFromHeader,
+		jwtauth.TokenFromQuery)
+	return token != nil && err == nil
+}
+
+func login(w http.ResponseWriter, r *http.Request) {
+	var user UserLogin
+
+	err := json.NewDecoder(r.Body).Decode(&user)
+	if err != nil {
+		http.Error(w, bodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	err = validate.Struct(user)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	dbUser, err := container.GetUserByUsernameUseCase.GetUserByUsername(user.Username)
+	if err != nil {
+		http.Error(w, logsErrorMessage, http.StatusForbidden)
+		return
+	}
+
+	err = bcrypt.CompareHashAndPassword([]byte(dbUser.Password), []byte(user.Password))
+	if err != nil {
+		http.Error(w, logsErrorMessage, http.StatusForbidden)
+		return
+	}
+
+	_ = SetJwtCookie(&w, dbUser.ID)
+
+	message, _ := json.Marshal(map[string]interface{}{"message": "User logged in! HTTPonly access_token cookie created"})
+	_, _ = w.Write(message)
+}
+
+func register(w http.ResponseWriter, r *http.Request) {
+	if !isLoggedIn(r) && !isAllowedToCreateUser() {
+		http.Error(w, "You are not allowed to create a user. Log in or reset database.", http.StatusForbidden)
+		return
+	}
+
+	var user UserRegister
+	err := json.NewDecoder(r.Body).Decode(&user)
+	if err != nil {
+		http.Error(w, bodyErrorMessage, http.StatusBadRequest)
+		return
+	}
+
+	err = validate.Struct(user)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	createdUser, err := container.CreateUserUseCase.CreateUser(useCases.CreateUserCommand{
+		Username: user.Username,
+		Password: user.Password,
+		Email:    user.Email,
+	})
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	err = SetJwtCookie(&w, createdUser.ID)
+
+	message, _ := json.Marshal(map[string]interface{}{"message": "User registered! HTTPonly access_token cookie created"})
+	_, err = w.Write(message)
+}
+
+func NewAuthRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Post("/register", register)
+	r.Post("/login", login)
+	return r
+}

api/dependecyInjection.go

@@ -9,9 +9,13 @@ import (
 )
 
 type Container struct {
-	CreateArticleUseCase *CreateArticleUseCase
+	CreateArticleUseCase     *CreateArticleUseCase
-	GetArticleUseCase    *GetArticleUseCase
+	GetArticleUseCase        *GetArticleUseCase
-	ListArticlesUseCase  *ListArticlesUseCase
+	ListArticlesUseCase      *ListArticlesUseCase
+	GetUserUseCase           *GetUserUseCase
+	GetUserByUsernameUseCase *GetUserByUsernameUseCase
+	CreateUserUseCase        *CreateUserUseCase
+	ListUsersUseCase         *ListUsersUseCase
 }
 
 var container *Container
@@ -20,11 +24,19 @@ func setContainer(
 	createArticle *CreateArticleUseCase,
 	getArticle *GetArticleUseCase,
 	listArticle *ListArticlesUseCase,
+	getUser *GetUserUseCase,
+	getUserByUsername *GetUserByUsernameUseCase,
+	createUser *CreateUserUseCase,
+	listUsers *ListUsersUseCase,
 ) *Container {
 	container = &Container{
-		CreateArticleUseCase: createArticle,
+		CreateArticleUseCase:     createArticle,
-		GetArticleUseCase:    getArticle,
+		GetArticleUseCase:        getArticle,
-		ListArticlesUseCase:  listArticle,
+		ListArticlesUseCase:      listArticle,
+		GetUserUseCase:           getUser,
+		GetUserByUsernameUseCase: getUserByUsername,
+		CreateUserUseCase:        createUser,
+		ListUsersUseCase:         listUsers,
 	}
 	return container
 }
@@ -40,13 +52,17 @@ func InitContainer() {
 	if err != nil {
 		panic(err)
 	}
-	_ = db.AutoMigrate(&models.Article{})
+	_ = db.AutoMigrate(&models.Article{}, &models.User{})
 
 	_ = digContainer.Provide(func() *gorm.DB { return db })
 
 	_ = digContainer.Provide(func(db *gorm.DB) *CreateArticleUseCase { return NewCreateArticleUseCase(db) })
 	_ = digContainer.Provide(func(db *gorm.DB) *GetArticleUseCase { return NewGetArticleUseCase(db) })
 	_ = digContainer.Provide(func(db *gorm.DB) *ListArticlesUseCase { return NewListArticlesUseCase(db) })
+	_ = digContainer.Provide(func(db *gorm.DB) *GetUserUseCase { return NewGetUserUseCase(db) })
+	_ = digContainer.Provide(func(db *gorm.DB) *GetUserByUsernameUseCase { return NewGetUserByUsernameUseCase(db) })
+	_ = digContainer.Provide(func(db *gorm.DB) *CreateUserUseCase { return NewCreateUserUseCase(db) })
+	_ = digContainer.Provide(func(db *gorm.DB) *ListUsersUseCase { return NewListUsersUseCase(db) })
 
 	_ = digContainer.Invoke(setContainer)
 }

api/validator.go

@@ -0,0 +1,9 @@
+package api
+
+import "github.com/go-playground/validator/v10"
+
+var validate *validator.Validate
+
+func InitValidator() {
+	validate = validator.New()
+}

cmd/main.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/httplog"
+	"github.com/go-chi/jwtauth/v5"
 	"net/http"
 )
 
@@ -16,15 +17,30 @@ func jsonContentTypeMiddleware(next http.Handler) http.Handler {
 	})
 }
 
+func initJwt() {
+	api.TokenAuth = jwtauth.New("HS256", []byte("secret"), nil)
+}
+
+func getHelloWorld(w http.ResponseWriter, _ *http.Request) {
+	msg, _ := json.Marshal(map[string]string{"message": "Hello World"})
+	_, _ = w.Write(msg)
+}
+
 func main() {
 	api.InitContainer()
+	api.InitValidator()
+	initJwt()
 
 	r := chi.NewRouter()
-	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+	r.Get("/", getHelloWorld)
-		msg, _ := json.Marshal(map[string]string{"message": "Hello World"})
+
-		_, _ = w.Write(msg)
+	r.Group(func(r chi.Router) {
+		r.Use(jwtauth.Verifier(api.TokenAuth))
+		r.Use(jwtauth.Authenticator)
+		r.Mount("/article", api.NewArticleRouter())
 	})
-	r.Mount("/article", api.NewArticleRouter())
+
+	r.Mount("/auth", api.NewAuthRouter())
 
 	apiRouter := chi.NewRouter()
 	apiRouter.Use(httplog.RequestLogger(httplog.NewLogger("GohCMS2")))

domain/gateways/IUserRepository.go

@@ -0,0 +1,10 @@
+package gateways
+
+import . "GohCMS2/domain/user"
+
+type IUserRepository interface {
+	Get(id uint32) (User, error)
+	GetByUsername(username string) (User, error)
+	GetAll() []User
+	Create(user User) (User, error)
+}

domain/user/user.go

@@ -0,0 +1,42 @@
+package user
+
+import "time"
+
+type User struct {
+	ID        uint32    `json:"id"`
+	Username  string    `json:"username"`
+	Password  string    `json:"password"`
+	Email     string    `json:"email"`
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+func FromApi(
+	username string,
+	password string,
+	email string,
+) User {
+	return User{
+		Username: username,
+		Password: password,
+		Email:    email,
+	}
+}
+
+func FromDb(
+	id uint32,
+	username string,
+	password string,
+	email string,
+	createdAt time.Time,
+	updatedAt time.Time,
+) User {
+	return User{
+		ID:        id,
+		Username:  username,
+		Password:  password,
+		Email:     email,
+		CreatedAt: createdAt,
+		UpdatedAt: updatedAt,
+	}
+}

go.mod

@@ -5,17 +5,36 @@ go 1.20
 require (
 	github.com/glebarez/sqlite v1.9.0
 	github.com/go-chi/httplog v0.3.1
+	github.com/go-chi/jwtauth/v5 v5.1.1
 	go.uber.org/dig v1.17.0
+	golang.org/x/crypto v0.10.0
 	gorm.io/gorm v1.25.2
 )
 
 require (
+	github.com/ajg/form v1.5.1 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/gabriel-vasile/mimetype v1.4.2 // indirect
 	github.com/glebarez/go-sqlite v1.21.2 // indirect
+	github.com/go-playground/locales v0.14.1 // indirect
+	github.com/go-playground/universal-translator v0.18.1 // indirect
+	github.com/go-playground/validator/v10 v10.15.0 // indirect
+	github.com/goccy/go-json v0.10.2 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
+	github.com/leodido/go-urn v1.2.4 // indirect
+	github.com/lestrrat-go/blackmagic v1.0.1 // indirect
+	github.com/lestrrat-go/httpcc v1.0.1 // indirect
+	github.com/lestrrat-go/httprc v1.0.4 // indirect
+	github.com/lestrrat-go/iter v1.0.2 // indirect
+	github.com/lestrrat-go/jwx/v2 v2.0.11 // indirect
+	github.com/lestrrat-go/option v1.0.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/segmentio/asm v1.2.0 // indirect
+	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/text v0.10.0 // indirect
 	modernc.org/libc v1.24.1 // indirect
 	modernc.org/mathutil v1.5.0 // indirect
 	modernc.org/memory v1.6.0 // indirect

go.sum

@@ -1,7 +1,16 @@
+github.com/ajg/form v1.5.1 h1:t9c7v8JUKu/XxOGBU0yjNpaMloxGEJhUkqFRq0ibGeU=
+github.com/ajg/form v1.5.1/go.mod h1:uL1WgH+h2mgNtvBq0339dVnzXdBETtL2LeUXaIv25UY=
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/decred/dcrd/crypto/blake256 v1.0.1/go.mod h1:2OfgNZ5wDpcsFmHmCK5gZTPcCXqlm2ArzUIkw9czNJo=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 h1:8UrgZ3GkP4i/CLijOJx79Yu+etlyjdBU4sfcs2WYQMs=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0/go.mod h1:v57UDF4pDQJcEfFUCRop3lJL149eHGSe9Jvczhzjo/0=
 github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
 github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/gabriel-vasile/mimetype v1.4.2 h1:w5qFW6JKBz9Y393Y4q372O9A7cUSequkh1Q7OhCmWKU=
+github.com/gabriel-vasile/mimetype v1.4.2/go.mod h1:zApsH/mKG4w07erKIaJPFiX0Tsq9BFQgN3qGY5GnNgA=
 github.com/glebarez/go-sqlite v1.21.2 h1:3a6LFC4sKahUunAmynQKLZceZCOzUthkRkEAl9gAXWo=
 github.com/glebarez/go-sqlite v1.21.2/go.mod h1:sfxdZyhQjTM2Wry3gVYWaW072Ri1WMdWJi0k6+3382k=
 github.com/glebarez/sqlite v1.9.0 h1:Aj6bPA12ZEx5GbSF6XADmCkYXlljPNUY+Zf1EQxynXs=
@@ -11,6 +20,18 @@ github.com/go-chi/chi/v5 v5.0.10 h1:rLz5avzKpjqxrYwXNfmjkrYYXOyLJd37pz53UFHC6vk=
 github.com/go-chi/chi/v5 v5.0.10/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
 github.com/go-chi/httplog v0.3.1 h1:uC3IUWCZagtbCinb3ypFh36SEcgd6StWw2Bu0XSXRtg=
 github.com/go-chi/httplog v0.3.1/go.mod h1:UoiQQ/MTZH5V6JbNB2FzF0DynTh5okpXxlhsyxoP5m8=
+github.com/go-chi/jwtauth/v5 v5.1.1 h1:Pjixqu5YkjE9sCLpzE01L0Q4sQzJIPdo7uz9r8ftp/c=
+github.com/go-chi/jwtauth/v5 v5.1.1/go.mod h1:CYP1WSbzD4MPuKCr537EM3kfFhSQgpUEtMJFuYJjqWU=
+github.com/go-chi/render v1.0.3 h1:AsXqd2a1/INaIfUSKq3G5uA8weYx20FOsM7uSoCyyt4=
+github.com/go-chi/render v1.0.3/go.mod h1:/gr3hVkmYR0YlEy3LxCuVRFzEu9Ruok+gFqbIofjao0=
+github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
+github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
+github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
+github.com/go-playground/universal-translator v0.18.1/go.mod h1:xekY+UJKNuX9WP91TpwSH2VMlDf28Uj24BCp08ZFTUY=
+github.com/go-playground/validator/v10 v10.15.0 h1:nDU5XeOKtB3GEa+uB7GNYwhVKsgjAR7VgKoNB6ryXfw=
+github.com/go-playground/validator/v10 v10.15.0/go.mod h1:9iXMNT7sEkjXb0I+enO7QXmzG6QCsPWY4zveKFVRSyU=
+github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
+github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/google/pprof v0.0.0-20221118152302-e6195bd50e26 h1:Xim43kblpZXfIBQsbuBVKCudVG457BR2GZFIz3uw3hQ=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
@@ -19,6 +40,21 @@ github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/leodido/go-urn v1.2.4 h1:XlAE/cm/ms7TE/VMVoduSpNBoyc2dOxHs5MZSwAN63Q=
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useCases/CreateUserUseCase.go

@@ -0,0 +1,27 @@
+package useCases
+
+import (
+	. "GohCMS2/adapters/secondary/gateways"
+	. "GohCMS2/domain/user"
+	"gorm.io/gorm"
+)
+
+type CreateUserUseCase struct {
+	userRepository UserRepository
+}
+
+type CreateUserCommand struct {
+	Username string
+	Password string
+	Email    string
+}
+
+func NewCreateUserUseCase(db *gorm.DB) *CreateUserUseCase {
+	return &CreateUserUseCase{
+		userRepository: *NewUserRepository(db),
+	}
+}
+
+func (g *CreateUserUseCase) CreateUser(user CreateUserCommand) (User, error) {
+	return g.userRepository.Create(FromApi(user.Username, user.Password, user.Email))
+}

useCases/GetUserByUsernameUseCase.go

@@ -0,0 +1,21 @@
+package useCases
+
+import (
+	. "GohCMS2/adapters/secondary/gateways"
+	. "GohCMS2/domain/user"
+	"gorm.io/gorm"
+)
+
+type GetUserByUsernameUseCase struct {
+	userRepository UserRepository
+}
+
+func NewGetUserByUsernameUseCase(db *gorm.DB) *GetUserByUsernameUseCase {
+	return &GetUserByUsernameUseCase{
+		userRepository: *NewUserRepository(db),
+	}
+}
+
+func (g *GetUserByUsernameUseCase) GetUserByUsername(username string) (User, error) {
+	return g.userRepository.GetByUsername(username)
+}

useCases/GetUserUseCase.go

@@ -0,0 +1,21 @@
+package useCases
+
+import (
+	. "GohCMS2/adapters/secondary/gateways"
+	. "GohCMS2/domain/user"
+	"gorm.io/gorm"
+)
+
+type GetUserUseCase struct {
+	userRepository UserRepository
+}
+
+func NewGetUserUseCase(db *gorm.DB) *GetUserUseCase {
+	return &GetUserUseCase{
+		userRepository: *NewUserRepository(db),
+	}
+}
+
+func (g *GetUserUseCase) GetUser(id uint32) (User, error) {
+	return g.userRepository.Get(id)
+}

useCases/ListUsersUseCase.go

@@ -0,0 +1,21 @@
+package useCases
+
+import (
+	. "GohCMS2/adapters/secondary/gateways"
+	. "GohCMS2/domain/user"
+	"gorm.io/gorm"
+)
+
+type ListUsersUseCase struct {
+	userRepository UserRepository
+}
+
+func NewListUsersUseCase(db *gorm.DB) *ListUsersUseCase {
+	return &ListUsersUseCase{
+		userRepository: *NewUserRepository(db),
+	}
+}
+
+func (g *ListUsersUseCase) ListUsers() []User {
+	return g.userRepository.GetAll()
+}