authentication-server

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authentication-server

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The authentication-server is a node app that handles user registration, authentication & authorization with JWT.

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# Authentication Server

The authentication-server is a node app that handles user registration, authentication & authorization with [JWT](https://jwt.io/introduction).

Here is the [REPO](https://github.com/coluck/authentication-server).

Here is the [DEMO](https://auth-serv.herokuapp.com/).

### How it works?
Registered users are stored in mongoDB and their password is hashed by bcrypt. When the user POSTs their credentials to the server, they recieve 2 Json Web Token (access & refresh).

On the client side user should set the authorization header(Bearer token) with access token. So user can be authorized by server with [middleware](#middleware). If the access token expired, renew the access token with refresh token by POSTing it to the "/token" endpoint.

### Usage
1. This server can be used as a standalone server. So the athentication system would be apart from the backend system. For authorization, JWT should be verified. JWT verification can be done in various programming languages. See: [libraries](https://jwt.io/#libraries-io).

2. This server built with express.js. So it can be used on an existing express.js application.

-----

### Installation
```bash
git clone https://github.com/coluck/authentication-server.git
cd authentication-server
# replace .env.example with .env and customize it
npm i
npm start
```

### API

| No  | Method | Endpoint    | Description                                                                   |
| --- | ------ | ----------- | ----------------------------------------------------------------------------- |
| #1  | `POST` | `/register` | Creates a new user in MongoDB and returns it with status 201                  |
| #2  | `POST` | `/login`    | Returns access & refresh tokens if user credentials is valid                  |
| #3  | `POST` | `/token`    | Returns a new access token if refresh token in body is verified               |
| #4  | `GET`  | `/validate` | Returns user id if token in header is verified with [middleware](#middleware) |

| No  | Request Body                         | Response Body                   |
| --- | ------------------------------------ | ------------------------------- |
| #1  | { username, email, password }        | { username, email, createdAt }  |
| #2  | { email, password }                  | { access_token, refresh_token } |
| #3  | { refresh_token }                    | { access_token }                |
| #4  | Authorization: Bearer <access_token> | User id that is logged in       |

### Configuration
Configuration should made in the .env file, before run. .env.example file is below:
```env
PORT=3000
MONGO_URL=mongodb://localhost:27017/<db_name>
ACCESS_TOKEN_EXPIRES_IN=5m
ACCESS_TOKEN_SECRET=c1ec3791140abfdddd...
REFRESH_TOKEN_EXIPRES_IN=1d
REFRESH_TOKEN_SECRET=2a4de696eb12838bc...
```

### Scripts

1. ACCESS_TOKEN_SECRET & REFRESH_TOKEN_SECRET (both should be **different**) can be securely created with:
```bash
npm run secret  # returns secret, paste it in .env
```
2. MongoDB connection can be tested with:
```bash
npm run dbtest
```
3. Start authentication-server:
```bash
npm start
```
4. Start development server with nodemon:
```bash
npm run dev
```

### Project Structure

```bash
.
├── src                       // Source Folder
│   ├── controllers           // Controllers in the API
│   │   ├── index.js
│   │   ├── login.js          // No: #1 /login
│   │   ├── register.js       // No: #2 /register
│   │   └── tokenRefresh.js   // No: #3 /token 
│   ├── public
│   │   └── index.html        // Mini User Interface built with vue
│   ├── authRouter.js         // All routings 
│   ├── middleware.js         // Authorize user with access token in header
│   ├── mongo.js              // Initialize MongoDB connection
│   ├── token.js              // Token Utils. Creates and verifies JWT
│   ├── userModel.js          // Mongoose Model and Schema
│   └── validation.js         // Joi validation for User Model
├── test
│   ├── mongoConnection.js    // "npm run dbtest" executes this
│   └── ...                   // login and regiter tests
├── .env.exmaple              // Rename it with ".env"
├── index.js                  // Entry file
└── server.js                 // authentication-server app
```

### User Interface
Mini user interface is build with vue.js to show up what is going on.
Available on root "/". It can be removed from server.js file.
![Screenshot_2021-05-02 authentication-sever User Interface](https://user-images.githubusercontent.com/39749730/116825809-808cf700-ab99-11eb-8b30-98a5cfbc8f3e.png)
![Screenshot_2021-05-02 authentication-sever User Interface(1)](https://user-images.githubusercontent.com/39749730/116825812-8256ba80-ab99-11eb-9e98-9f9741344224.png)

### User Model
User Model is created with [mongoose](https://www.npmjs.com/package/mongoose) in userModel.js.
userModel = { username, email, password }

### Hash Password
Password is hashed with [bcryptjs](https://www.npmjs.com/package/bcryptjs).
For performance see also: [bcrypt](https://www.npmjs.com/package/bcrypt).

### Validations
Implemented with [joi](https://joi.dev/api/?v=17.4.0) in validation.js
There are 2 validations(register and login) for request body.

### Middleware
The isAuthenticated middleware verifies the jwt in authorization header.
Simplified version of [express-jwt](https://www.npmjs.com/package/express-jwt).
Used in /validate endpoint for testing purposes.

### Logger
Logging made with [morgan](https://www.npmjs.com/package/morgan).
The formats is "tiny". In server.js file it can be customized.

### Todos
- Refresh tokens can be saved in storage like redis or mongoDB
- Login or Register limitation by ip address
- Add JWT claims like iss, sub, aud...
- Email verification
- Login with username instead of email

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