backbone-oauth V0.1

This simple OAuth 2.0 plugin for Backbone.js provides an OAuth class that handles client-side authentication with OAuth providers such as Facebook or Google.

The most simple use case would be something like this:

// Configurate the Facebook OAuth settings.
_.extend(Backbone.OAuth.configs.Facebook, {
    client_id: 'YOURAPPID',
    redirect_url: window.location.protocoll + '//' + window.location.host + '/auth_redirect.html',

    // Called after successful authentication.
    onSuccess: function(params) {

        // Get the user's data from Facebook's graph api.
        $.ajax('https://graph.facebook.com/me?access_token=' + params.access_token, {
            success: function(data) {
                alert('Howdy, ' + data.name);
            }
        });
    }
});

// Create a new OAuth object and call the auth() method to start the process.
var FB = new Backbone.OAuth(Backbone.OAuth.configs.Facebook);
FB.auth();
);

On calling auth() a new window will be opened and the OAuth provider's OAuth dialog will be displayed. If the user chooses to authenticate with your website, the onSuccess() method you specified will be called with the returned data.

Dependencies

The backbone-oauth plugin relies on

• Backbone (tested with Backbone.js v0.9.2, but should work with most other versions)
• Underscore.js

Using this Backbone.js plugin

If you are not using a module loading library you will want to include the source file into your webpage:

<script type='text/javascript' src='/js/lib/modules/backbone-oauth.js'></script>

If you are using a module loading library like Require.js you can simply add it to your module's dependencies.

define(['app', 'plugins/backbone.oauth'], function(app) {
    // Your module code.
});

You probably want to make sure that the shim configuration is set correctly.

require.config({
    // Your path configuration goes here
    shim: {
        backbone: {
        deps: ['underscore', 'jquery'],
            exports: 'Backbone'
        },
        // backbone.oauth depends on Backbone.
        'plugins/backbone.oauth' : ['backbone']
    }
});  

Configuring backbone.oauth

The backbone.oauth plugin comes with two configuration objects:

• Backbone.OAuth.configs.Facebook and
• Backbone.OAuth.configs.Google

You will need to extend these configuration objects with at least the following two properties:

• client_id and
• redirect_url

Or you can create your own configuration object, that may hold the following properties:

• client_id (obligatory) Your OAuth provider's app_id.
• redirect_url (obligatory) The URL to redirect to after the user clicks a button in the dialog. The page you redirect to, should serve a single script (see below).
• auth_url (obligatory) The URL to display in the OAuth dialog.
• scope (optional) A comma separated list of permission names which you would like the user to grant your application.
• state (optional) A unique string used to maintain application state between the request and callback. You should use this to protect against Cross-Site Request Forgery.
• access_token_name (optional) The property name of the returned access token. Defaults to 'access_token'.

You are free to override the following methods:

• onSuccess(params) Called when authSuccess returned true, indicating that the authentication was successful. params holds the parsed url's hash and the access_token.
• onError(params) Called when authSuccess returned false, indicating that the authentication failed. params holds the parsed url's hash and probably an error description.

If you really have to, you can also override these methods.

• onRedirect(params) Called when the OAuth dialog redirects to your redirect_url. params holds the parsed url's hash.
• authSuccess(params) A function that returns true if the returned params indicate a successful authentication. params holds the parsed url's hash.

The file you are redirecting to...

... should contain a single script:

<script>var hash=window.location.hash;window.close();opener.OAuthRedirect(hash);</script>