require 'sinatra'
require "sinatra/reloader"
require 'yaml'
require 'json'
# configure sinatra
set :run, false
set :raise_errors, true
# REQUEST STEP (server-side flow)
get '/server-side' do
# NOTE: You would just hit this endpoint directly from the browser in a real app. The redirect is
# just here to explicit declare this server-side flow.
redirect '/auth/facebook'
end
# REQUEST STEP (client-side flow)
get '/client-side' do
content_type 'text/html'
# NOTE: When you enable cookie below in the FB.init call the GET request in the FB.login callback
# will send a signed request in a cookie back the OmniAuth callback which will parse out the
# authorization code and obtain an access_token with it.
<<-HTML
<html>
<head>
<title>Client-side Flow Example</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
window.fbAsyncInit = function() {
FB.init({
appId: '#{ENV['FACEBOOK_APP_ID']}',
version: 'v4.0',
cookie: true // IMPORTANT must enable cookies to allow the server to access the session
});
console.log("fb init");
};
(function(d, s, id){
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) {return;}
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
</script>
</head>
<body>
<div id="fb-root"></div>
<p id="connect">
<a href="#">Connect to FB!</a>
</p>
<p id="results" />
<script type="text/javascript">
$('a').click(function(e) {
e.preventDefault();
FB.login(function(response) {
console.log(response);
if (response.authResponse) {
$('#connect').html('Connected! Hitting OmniAuth callback (GET /auth/facebook/callback)...');
// since we have cookies enabled, this request will allow omniauth to parse
// out the auth code from the signed request in the fbsr_XXX cookie
$.getJSON('/auth/facebook/callback', function(json) {
$('#connect').html('Connected! Callback complete.');
$('#results').html(JSON.stringify(json));
});
}
}); // if you want custom scopes, pass them as an extra, final argument to FB.login
});
</script>
</body>
</html>
HTML
end
# CALLBACK STEP
# - redirected here for server-side flow
# - ajax request made here for client-side flow
get '/auth/:provider/callback' do
content_type 'application/json'
JSON.dump(request.env)
end