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o-auth-connect

OAuthConnect is a ZF2/ZF3 library that adds the "Login With Facebook, Google, etc" behavior to you application.

It's a tiny ZF2 module that you can require using composer. It does not install any tirdy part OAuth library automatically, so you are free to install only the OAuth librarys of the services you want to use and o-auth-connect will detect it.

For example. Lets say you want add Login With Facebook functionality to your site. In order to do that you just need to install o-auth-connect and then install Facebook PHP SDK. That way you only install what you will be using.

Installing

1. Execute composer require stavarengo/o-auth-connect:^0.0
2. Install all libraries of the OAuth Services you want to use. See list of supported services.

Using it

First Things First: Concepts!

The simplier the better. With OAuthConnect you just have tow URLs to work with, instead of worry about all the URLs endpoint that each OAuth service expose to you interact with when asking for someone's authorization.

1. sta/oAuthConnect/ask/:oAuthService: This route is to where you must send your users when asking for their authorizations. This route renders a URL like this: /sta/o-auth-connect/facebook.
2. sta/oAuthConnect/response: This is where the OAuth Service will redirect the users autorization's response. Most of the OAuth Services ask for an redirect callback URL. This is an URL in your site that is prepared to receive the user's authorization response (if the user allow or deny your request). OAuthConnect take care of the response for your, so whenever you were setting up a OAuth Service account and it asks you something like "Whats your redirect URL?", you must set <your_host>/sta/o-auth-connect/response. Later int this file you will see how to listen to that response.

   Learn by Example

   Lest see how it works with an example. In this example we are going to add "Login With Facebook" and "Login with Google" functionality to our site.

Learn by Example: Showing links to login

First you need to add the links that says "Login with Facebook" and "Login with Google". These links will point to the route sta/oAuthConnect/ask/:oAuthService. So, put the code bellow inside a Zend View (the phtml file) that will print out the links (Note: This code will fail! If you're in a hurry skip to here, otherwise, continue to read to see why it will fail).

This will print out a link that send the user to the page where the OAuth Service (in this case, Facebook) will ask to the user if he agree to share his Facebook information with us. Note the parameter oAuthService. You must use this parameter to set the name of the service you want to use.

Lest understand a little bit more about what is going on in this phtml file.

1. We are creating two URLs: One that allow your users to login with Facebook and another with Google.
2. Both URLs point to the same route, each is sta/oAuthConnect/ask. It's important to note that you will always use this route to generate a link whenever you want to allow your user share their information using OAuth.
3. We are passing a query parameter called redirectAfterResponse. Use this parameter to inform where should we go after the user awser if they allow or not. The parameter redirectAfterResponse is an array an it receives the same parameters you would pass to the method \Zend\Mvc\Controller\Plugin\Redirect::toRoute(). So, in others words redirectAfterResponse is an array that can receives tree entries: route - route name (required); params - parameters of your route (eg: when your're using a Segment route); options - others route options (eg: query parameters).
4. Google requires that you always specify what are the scopes you need (Facebook doesn't), because of this we passed a query parameter called scopes when creating the URL to login with Google. The parameter scopes is an array of string with with the scopes you need to ask.

Note: Passing route informations instead of an URL to the redirectAfterResponse parameter makes your website safier, since it will avoid others maliciousus scripts to ack as if they were you asking for your users to share their information.

Note: If your don't want to expose yours routes throgth an query param, read it to learn how.

Learn by Example: Executing and testing

If you execute this code now and click in one of the links you will get an error Zend\ServiceManager\Exception\ServiceNotCreatedException with some previous exceptions attached to it. Looking down throw the previous exceptions attached you will find the exception Sta\OAuthConnect\Exception\MissingConfiguration saying that the configuration $config[\Sta\OAuthConnect\ConfigProvider::class]['o-auth-services']['facebook']['appId'] wasn't found.

It happens because we need to configure our credentials of all the services we need to use. Each service has diferent ways to declare its credentials, but you does not need to worry about it: OAuthConnect will ways say what is missing and where exactly you should set it. So lets add our credentials to use both Google and Facebook OAuth Services.

Note: You can see what configuration option each service accept in their source files. So checkout the files here if you want to learn more.

Add this to your config/autoload/global.php config file.

Learn by Example: Done

You are now good to go. Access your site and click in one of the links that your phtml file printed out. You will be redirect to the OAuth Service website, where it will be asking for your authorization. Go ahead: Authorize it and you will be redirect back to your site. Note that you were redirected back to where you setted up in the parameter redirectAfterResponse. If you didn't set the parameter redirectAfterResponse, then you will see a message saying: "You can now close this window" (More information about this message here).

To avoid the message "You can now close this window", you must tell to OAuthConnect where to go after a response came. So, change you

Listen to authorization responses

Supported OAuth Services

See list of supported library here.

Adding support to others OAuth Libraries

If you need to use another OAuth service that is not supported by o-auth-connect yet, all you need to to is:

1. Creating a class that implements the interface \Sta\OAuthConnect\OAuthService\OAuthServiceInterface.
2. Add this class to the OAuthConnect using the config file, as follow:

The string Your\New\Facy\OAuthServiceClass could be ether a class name or a service factory name, that would be create troght ZF [ServiceManager](zendframework.github.io/zend-servicemanager). OAuthConnect will automatically detect whether or not you meant to use ServiceManager.

Hidding Routes from Query Params

ToDo: Section still in under construction

Asynchronous authorization: Asking without leaving your site

ToDo: Section still in under construction

Note: All strings in OAuthConnect are translated using Zend Translator. Read here to learn more.

Translating messages

ToDo: Section still in under construction

OAuthConnect prints a few (really few) strings to your user. By default all strings are written in English. OAuthConnect also has theses strings translated to a few others languages. You can check if yours is already translated here. Even if it is not translated to your language yet, you can translate it your self by following theses bellow.

Note: Help our project to grow by sending your translations via pull request.