react-authmanager

React authentication manager 🔑

react-authmanager is a highly-configurable manager for react. It manages users authentication with JWT in your app and provides guards HOCs to secure components in a flexible and simple way.

• Getting started
• Authenticate users
• Access user informations
• Secure components
• Authmanager
  • Authmanager.config
  • Authmanager.utils

1 - Getting started

npm install --save react-authmanager, then you have to configure the package.
To manage configuration, you need to import the default Authmanager.
You need to configure the manager before starting to use, so your highest component file is the best place (by example, it's the App.js file with a create-react-app instance !)

You can also create a new manager instance.

import Authmanager from 'react-authmanager';

const customManager = Authmanager.create("customName", { ...config });

react-authmanager needs:

• to know how to login the user from the server and get a token back (fetchToken)
• to know how to get the current logged user informations from the server (fetchUser)

you will need:

• to include the current token in your requests headers authorization (getToken)

Minimal configuration for the manager

import Authmanager from 'react-authmanager';

// how to login the user from the server and get a token back
Authmanager.config.fetchToken = async credentials => {
  ... // login user with an ajax call to the server and return the given token
  return token;
}

// how to get the current logged user informations from the server
Authmanager.config.fetchUser = async () => {
  ... // get current logged user informations from the server with an ajax call and return any data you will need
  return user;
}

Authorize your requests

// include the current token in your requests headers authorization
fetch(..., {
  headers: new Headers({
    'Authorization': 'Bearer ' + Authmanager.getToken() // returns null if no token is stored
  }),
  ...
});

For more configurations, please read the Authmanager section below.

2 - Authenticate users

withAuth HOC injects in your component helpers to manage authentication: login, logout and auth.
login and logout are functions to log users. auth is an object that contains a state of operations.

prop	default	description
login		function send credentials to the server to get a token back
logout		function remove the stored token
auth:		object informations about the current state of operations
-- loading	false	bool is authentication (login or logout) currently loading

import Authmanager from 'react-authmanager';

class LoginComponent extends React.Component {
  handleSubmit() {
    const credentials = {
      email: '[e-mail]',
      password: 'ThisIsASecret'
    }; // or whatever data you want to send to the server (see the getToken configuration in the Minimal configuration section above)
    
    this.props.login(credentials)
      .then(function() { alert('Hello !') })
  }
  
  render() {
    if (this.props.auth.loading)
      return (<MyLoadingComponent />);
    
    return ( ... );
  }
  
  ...
}

export default Authmanager.withAuth(LoginComponent); // or customManager.withAuth(LoginComponent);

...

class LogoutComponent extends React.Component {
  handleClick() {
    this.props.logout()
      .then(function() { alert('Good bye !') })
  }
  
  ...
}

export default Authmanager.withAuth(LogoutComponent); // or customManager.withAuth(LogoutComponent);

You can also call the login and logout methods anywhere on the manager with Authmanager.login() and Authmanager.logout()

3 - Access user informations

withUser HOC will automatically injects an user object in your component props.
This object contains informations about the current user:

prop	default	description
user:		object containing current user informations
-- loading	false	bool is user currently loaded from the server
-- logged	false	bool is the current user logged in (setted by isUserLogged)
-- ...	null	any informations about the user sent by the server (setted by getUser)

import Authmanager from 'react-authmanager';

class MyComponent extends React.Component {
  handleClick() {
    if (this.props.user.logged)
      alert('Hello ' + this.props.user.name);
    else
      alert('Hello John, please login !');
  }
  
  ...
}

export default Authmanager.withUser(MyComponent);

4 - Secure components

withGuard HOC helps you protect your components in a flexible way. By example, you can render a login form instead of a component if no user is logged in.
It needs a guard as parameter. A guard is just a function that returns a component, so you can easily create your own guards.
A guard function has parameters:

prop	description
user	object the current user object
next	function a function that returns the current Component
props	object the current component props

import Authmanager from 'react-authmanager';

const loggedGuard = function(user, props, next) {
  if (user.loading)
    return (<MyLoadingComponent />); // render a loading component if user is currently fetched from the server
  
  if (user.logged)
    return next(); // render the component if user is not loading and is logged
  
  return (<MyLoginComponent />); // render a login component by default (if user is fetched from the server but not logged)
}

class MyComponent extends React.Component {
  render() {
    return (
      <div>This message is visible only for logged users !</div>
    )
  }
  
  ...
}

export default Authmanager.withGuard(loggedGuard)(MyComponent);

You can inject data in your rendered component props through the next function

const guardThatInjects = function(user, props, next) {
    return next({ myNewProp: true });
}

class MyComponent extends React.Component {
  render() {
    console.log(this.props.myNewProp); // true
    return (
      <div>This message is visible only for logged users !</div>
    )
  }

  ...
}

export default Authmanager.withGuard(loggedGuard)(MyComponent);

You can also configure you guards from outside the component file with the addGuard Authmanager function :

Authmanager.addGuard('loggedGuard', function(user, props, next) {
  if (user.loading)
    return (<MyLoadingComponent />); // render a loading component if user is currently fetched from the server
    
  if (user.logged)
    return next(); // render the component if user is not loading and is logged
    
  return (<MyLoginComponent />); // render a login component by default (if user is fetched from the server but not logged)
});

...

class MyComponent extends React.Component {
  render() {
    return (
      <div>This message is visible only for logged users !</div>
    )
  }
  
  ...
}

export default Authmanager.withGuard('loggedGuard')(MyComponent);

5 - Authmanager

5.1 - Authmanager.config

To edit the configuration of react-authmanageryour manager, you have to override the config object:

import Authmanager from 'react-authmanager';

// will change the way how the manager will login the user and get a token back, see below
Authmanager.fetchToken = function(credentials) {}

interface IReactAuthConfig {
  fetchToken?: Function,
  fetchUser?: Function,
  isUserLogged?: Function
}

fetchToken([credentials]) [async]

Get an authentication token when an user tries to login. fetchToken is called when the auth login function is executed to store the token in localStorage.

Parameters

• [credentials] (Object) Argument given by the login function. (when you call Authmanager.login(credentials))

Return (String)

Need to return a token that will be stored

default

fetchToken = null;

example with axios

Authmanager.config.fetchToken = async credentials => {
  const { data } = await axios.post('https://example.com/login', credentials);
  return data.token;
}

fetchUser() [async]

Get the current authenticated user. fetchUser is called when the manager initialize its store and after an user login.

Return (Object)

Need to return informations about the current logged user

default

fetchUser = null;

example with axios

Authmanager.config.fetchUser = async () => {
 const { data } = await axios.get('https://example.com/current-user');
 return data;
}

isUserLogged([user]) [async]

Define if the current user (returned by getUser) is logged. isUserLogged is called after each user state change. The result is set in user.logged.

Parameters

• [user] (Object) Object returned by the getUser function.

Return (Boolean)

Need to return a boolean that tell if the current user (returned by `getUser`) is logged.

default

isUserLogged = userData => !!userData && Object.keys(userData).length > 0;

By default, isUserLogged returns true if fetchUser returns a non-empty object

5.2 - Authmanager utils

react-authmanager also provides some utilities to manage the manager from your app:

import Authmanager from 'react-authmanager';

// will return the current stored token, or null, see below
const token = Authmanager.getToken()

getToken()

Returns the current stored token (in localStorage). You should use getToken to authorize your requests to the server

Return (String)

Returns the token stored after the `fetchToken` call

example with axios

axios.defaults.transformRequest.push((data, headers) => {
  const token = Authmanager.getToken();
  if (token) headers.common['Authorization'] = 'Bearer ' + token;

  return data;
});

setToken([token])

Manually set a token. You can call the setToken if you want to implements your own login function.

Parameters

• [token] (String) String token that will be returned by the fetchToken function.

Return utils (Object)

Need to return a boolean that tell if the current user (returned by `getUser`) is logged.

example

Authmanager.setToken('aValidToken');
Authmanager.getUser();

addGuard([guard])

Create a guard at the manager level, you will be able to reuse the guard just by giving its name

Parameters

• [guard] (Function) A function that returns a component or call the next function to render the default component.

Return Component | next()

Need to return a valid React component or call the next function given in parameters.

example

Authmanager.addGuard('loggedGuard', (user, next) => {
  if (user.loading)
    return <div>loading</div>;
    
  if (user.logged)
    return next();
    
  return <div>login</div>;
});

getUser()

Call the fetchUser function and update the redux store. You can use this function to refresh the current logged user from the server

Return utils (Object)

Returns a promise that resolves the new user data

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