#cyclejs-auth0

cyclejs-auth0 is composed of two entities (a driver and a component wrapper).

The component wrapper allows you to:

• protect any of your component from unlogged users ⬇;
• make authenticated HTTP request to your api endpoint⬇.

The driver allows you to:

• init the auth0 lock ⬇;
• send actions ⬇ to the lock (like show or getUserInfo);
• read responses ⬇ from the lock;
• store token ⬇ in localStorage (or you can do it yourself if you want ⬇).

Compatibility note

cyclejs-auth0 is (for the moment) only compatible with @cycle/xstream-run.
It will be compatible with any stream lib in the future, but if you are impatient, a PR will be welcomed ;)

Installation

npm install cyclejs-auth0

The component wrapper

This is, by far, the simplest way to integrate Auth0 into your cyclejs app. The component wrapper will protect any of your component from unlogged users (users that don't have a token in localStorage).

Wrapper initialization

The basic setup will look like that:

import {makeAuth0Driver, protect} from "cyclejs-auth0";

function main(sources) {
    //sources include `auth0`
    const protectedComponent = protect(Component)(sources);

    return protectedComponent;
}

const drivers = {
    auth0: makeAuth0Driver("appkey", "appdomain")
}

Protecting a component

Protecting a component is as simple as calling const ProtectedComponent = protect(MyComponent). You then get a new protected component. You can use it as any cyclejs component: const sinks = ProtectedComponent(sources).

Here is a simple example of how to use protect

import {protect} from "cyclejs-auth0";

function MyComponent(sources) {
    return {
        DOM: xs.of(div("hello fellow user"))
    };
}

function main(sources) {
    const ProtectedComponent = protect(Component); //now the component is protected

    //when the component is initiated it will lookup for a jwt token in localStorage
    //if no token is found, it will spawn the auth0 login form
    //else it will just pass the decoded token to your component for you to consume it
    const sinks = protectedComponent(sources);

    return sinks;
}

Now if the user is not logged in when the component is instantiated, the Auth0 form will show up.

Making authenticated HTTP calls

Authentication in a single page app is often not only about protecting a component but also about sending the authentication token to your api endpoint. There is a simple way to do that with the component wrapper, the decorators option of the protect function.

const ProtectedComponent = protect(Component, {
    decorators: {
        //let's decorate the HTTP sink
        //the decorate function is given each produced value of the 
        //initial sink + the user's tokens (accessToken and idToken)
        HTTP: (request, tokens) => {
            return {
                ...request,
                headers: {
                    ...request.headers,
                    //Will add an Authorization header containing the user's access token to
                    //any of the http requests sent by the component
                    "Authorization": "Bearer:" + tokens.accessToken
                }
            }
        }
    }
});

const instance = ProtectedComponent(sources);

instance.HTTP //< this sink will be decorated with the token
instance.DOM //< this sink is the initial component's sink, untouched

Customizing the Auth0 login form

You might also want to customize how the auth0 form displays. There is a config object you can pass on the the diver's contructor function to achieve that.

const auth0Config = {
    auth: {
        params: { scope: "openid nickname" },
        responseType: "token",
    }
};

const drivers = {
    auth0: makeAuth0Driver("appkey", "appdomain", auth0Config)
}

All the parameters you can set are documented in the Auth0 lock documentation

Retrieving user's profile

You might want to access the user's profile in your application. It's common to display, at least the user's name and it's picture.

There are two ways to do that: decoding the JSON Web Token given by Auth0 to get basic information or requesting the user's full profile from Auth0.

Both methods need the user's token. Fortunatly protect also passes on a props object that contains a tokens$ stream to the component it's protecting.

You've guested it, it's the stream of the user's tokens (accessToken and idToken).

Let's try to decode this token to get some basic information about the user:

function Component(sources) {
    const tokens$ = sources.props.tokens$

    const user$ = tokens$
        .map(tokens => {
            return tokens ? // /!\ if user is not logged in, tokens is null
                jwtDecode(tokens.idToken) :
                null
        })

    return {
        DOM: user$
            .map(user => {
                return user ?
                    div("hello " + user.nickname) : //logged
                    div("Please log in") //not logged
            })
    }
}

Or if you want to request the full user's profile to Auth0:

function Component(sources) {
    const tokens$ = sources.props.tokens$

    const getUserInfoRequest$ = tokens$
+        .filter(tokens => !!tokens)
+        .map(tokens => {action: "getUserInfo", params: tokens.accessToken })
-        .map(tokens => {
-            return tokens ? // /!\ if user is not logged in, tokens is null
-                jwtDecode(tokens.idToken) :
-                null
-        })

+   const user$ = sources
+       .auth0
+       .select("getUserInfo")
+       .map(action => action.response)

    return {
        DOM: user$
            .map(user => {
                return user ?
                    div("hello " + user.nickname) : //logged
                    div("Please log in") //not logged
            }),

+        auth0: getUserInfoRequest$ //sending the user info request to the auth0 driver
    }
}

The driver

Driver initialisation

const drivers = {
    auth0: makeAuth0Driver(appKey, appDomain)
}

Cycle.run(main, drivers);

The makeAuth0Driver will instantiate a lock for your app (see the lock api doc here: https://github.com/auth0/lock#documentation )

Sending action to the Auth0 lock

Now that your lock is instantiated and the driver up, you can send action to be sent to the auth0. To send action you need to send a stream to the auth0 driver in the sinks of your app.

Right now, the available actions are : show, getUserInfo (+ logout that is not in the lock api)

For example:

function main(sources) {
    return {
        auth0: xs.of({ //this will ask the auth0's lock to show the login form
            action: "show",
            params: { //the options object that will be sent to the `show` method
                authParams: { scope: "openid nickname" },
                responseType: "token"
            }
        }),

        //... The other sinks of your app
    }
}

Reading responses from Auth0

Whenever an action is run against the lock, the driver is outputting a response stream. you can consume that stream using the select function. You can use it to filter the action you want to listen to. For example if you want to do something when the lock has shown, you can do the following:

function main({ auth0 }) {
    return {
        DOM: auth0
            .select("show")
            .map(div("Please log in")); //ok this example is lame ...
}

I want my token

Ok this whole authentication thing is here for one thing: getting the user's JSON Web Token.
In order to get the token, the driver is giving you a tokens$ stream, that you can subscribe to, that will output the user's idToken and accessToken. In case there are no tokens or the user just logout, the stream will output a null value (in that case you probably want to send the lock a show action).

Here is a typical use of the tokens$:

function main({ auth0 }) {
    const userTokens$ = auth0.tokens$;

    const user$ = userTokens$
        .filter(token => !!token) //check that the token is not empty
        .map(token => jwtDecode(token.idToken)) //decode jwt to get the basic user's info

    return {
        auth0: userTokens$
            .filter(token => !token) //if token is null
            .mapTo({ action: "show" }) //then send auth0 the show action
    }
}

Nice thing about the tokens$ is that it handles for you the storage of the token into localStorage. That means, if the user reload the page, the tokens$ will still output the token.
To remove the token from the storage, don't forget to send the logout action.

Here are the features of the tokens$:

• stores the token in localStorage whenever an authenticated event is sent by the lock;
• removes the token from localStorage when you send a logout action;
• outputs the JWT token for you to consume.

I want to deal with storage myself

No problem, if you want to store the token yourself you need to:

• not use the tokens$ at all;
• get the token by subscribing to select("authenticated").

Here is an example:

function main({ auth0, storage }) {
    var tokens$ = storage
        .local
        .getItem("token")
        .filter(tokens => !!tokens)
        .map(tokens => JSON.parse(tokens));

    //code that consumes the tokens$

    return {
        storage: auth0
            .select("authenticated")
            .map(response => ({ key: "token", value: JSON.stringify({
                idToken: response.idToken,
                accessToken: response.accessToken
            })})) //will send a store action to the storage driver
    }
}

Cycle.js Community

To discover many awesome resources, made by the community, about Cycle.js (drivers, videos, components, utilities ...), be sure to check cyclejs-community/awesome-cyclejs out ;)

Feedback

• "OMG it's awesome, it has changed my life"
• "I use Auth0 like that, how can I do with your driver?"
• "Would you consider implementing this?"
• "You should do that instead of that"
• "You really don't know how to speak english you french guys"

As long as it is constructive and polite, any feedback will be welcomed, so please, be my guest :)