Go JWT Auth (Fiber & Mongo)

Template create for use as CookieCutter for my Golang projects. The hardest part for start a project for me was to chose Stack and create the initial login and integrations like logger, database, etc. So I decided to create a template with everything already working.

All the project is based in interfaces that mean you can implement your own logic and use it in the project. example: you can use different database like Postgres, MySQL, etc. Just implement the interface and use it.

Stack

• Router: Fiber 🚀
• Database: Mongo 💾
• Doc: Swagger 📄
• Logger: Zap ⚡
• Mocks: gomock 💀
• Deploy: Docker 🐳
• CI: Github Actions 🐙

Before the execution

• Modify the file ./config/env.json with your parameters
• Install gomock go install go.uber.org/mock/mockgen@latest
• Install swag go install github.com/swaggo/swag/cmd/swag@latest

Routes

You can also check in the route /swagger/index.html after run the project 🤩.

Note 📝: For add a private route you need to create it in the private router v1Private inside the pkg/server/server.go file.

Name	Path	Method	Description	Request	Response
Register	/api/v1/register	POST	Create a new user	email,password
Login	/api/v1/login	POST	Login a user	email,password	token
Metrics	/metrics	GET	Monitor for your API		html
Documentation	/docs	GET	Documentation		html

How to use

For this example we will make suppose that you want to create endpoints for Blog Posts.

1. Create a new folder inside the internal folder with the name of your entity. In this case post.

2. Create tree folders inside the entity folder: application, domain and infrastructure.

3. Create two folders inside the domain folder: ports and model.

4. Create a file inside the model folder with the name of your entity. In this case post.go and define your struct Post.

   package model
   
   import "time"  
   
   type Post struct {
       ID        string `json:"id" bson:"_id"`
       Title     string             `json:"title" bson:"title"`
       Content   string             `json:"content" bson:"content"`
       CreatedAt time.Time          `json:"created_at" bson:"created_at"`
       UpdatedAt time.Time          `json:"updated_at" bson:"updated_at"`
   }

5. Create 3 files inside the ports folder: repository.go, handlers.go and application.go.

6. Define your interfaces inside the repository.go,handlers.go and application.go file.

   package ports
   
   import "github.com/your_user/your_project/internal/post/domain/model"
   
   type PostRepository interface {
        Create(post *model.Post) error
        FindAll() ([]*model.Post, error)
        FindByID(id string) (*model.Post, error)
        Update(post *model.Post) error
        Delete(id string) error
    }

7. Modify the scripts/generate-mocks.sh file and add your three new interfaces.

   mockgen -destination=pkg/mocks/mock_post_application.go -package=mocks --build_flags=--mod=mod github.com/solrac97gr/go-jwt-auth/internal/post/domain/ports PostApplication &&
   mockgen -destination=pkg/mocks/mock_post_repository.go -package=mocks --build_flags=--mod=mod github.com/solrac97gr/go-jwt-auth/internal/post/domain/ports PostRepository &&
   mockgen -destination=pkg/mocks/mock_post_handlers.go -package=mocks --build_flags=--mod=mod github.com/solrac97gr/go-jwt-auth/internal/post/domain/ports PostHandlers

8. Run the scripts/generate-mocks.sh file.

9. Now is time for implement your interfaces. Create two folders inside the infrastructure folder with the name of repositories and handlers.

10. Create a file inside the repositories folder with the name of your interface implementation. In this case mongo.go and implement the PostRepository interface.

 package repositories

 type MongoPostRepository struct {
     db *mongo.Database
     logger logger.LoggerApplication
     configurator config.ConfigApplication
 }
 
 func NewMongoPostRepository(db *mongo.Database) *MongoPostRepository {
     return &MongoPostRepository{db: db}
 }

 func (m *MongoPostRepository) Create(post *model.Post) error {
     _, err := m.db.Collection("posts").InsertOne(context.Background(), post)
     if err != nil {
 		m.logger.Error("Error creating post", err)
         return err
     }
     return nil
 }
 .
 .
 .

11. Create a file inside the handlers folder with the name of your interface implementation. In this case http.go and implement the PostHandler interface.

package handlers

 type HTTPPostHandler struct {
     postApplication ports.PostApplication
     logger logger.LoggerApplication
     validator validator.ValidatorApplication
 }
 
 func NewHTTPPostHandler(postApplication ports.PostApplication) *HTTPPostHandler {
     return &HTTPPostHandler{postApplication: postApplication}
 }

 func (h *HTTPPostHandler) CreatePost(c *fiber.Ctx) error {
     post := &model.Post{}
     if err := c.BodyParser(post); err != nil {
         h.logger.Error("Error parsing post", err)
         return c.Status(http.StatusBadRequest).JSON(fiber.Map{"error": err.Error()})
     }
     if err := h.postApplication.Create(post); err != nil {
         h.logger.Error("Error creating post", err)
         return c.Status(http.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
     }
     return c.Status(http.StatusCreated).JSON(fiber.Map{"message": "Post created successfully"})
 }
 .
 .
 .

12. Add your handlers to new routes depends on if it's public or private. In this case we will add it to the private routes in file pkg/server/server.go .

v1Private.Post("/posts", h.postHandler.CreatePost)

13. If you want to add it to the swagger documentation view use comment with special annotation for your handlers.

// @Summary Create a new post
// @Description Create a new post
// @Tags posts
// @Accept json
// @Produce json
// @Param post body model.Post true "Post"
// @Success 201 {object} fiber.Map
// @Failure 400 {object} fiber.Map
// @Failure 500 {object} fiber.Map
// @Router /posts [post]
func (h *HTTPPostHandler) CreatePost(c *fiber.Ctx) error {
     .
     .
     .
}

14. Generate the swagger documentation with the command /scripts/generate-docs.sh.
15. Run the project with the command go run cmd/http/main.go or with the script scripts/run.sh.

Considerations

• The scripts/generate-mocks.sh file is used to generate the mocks of the interfaces.
• The scripts/generate-docs.sh file is used to generate the swagger documentation.
• The scripts/run.sh file is used to run the project.
• The scripts/run-tests.sh file is used to run the tests.
• The scripts/run-tests-coverage.sh file is used to run the tests with coverage.
• For avoid create users with same mail, make the mail field unique in the database (mongo index in this case).

License

Apache License 2.0