Authentification to Rational Team Concert with Javascript and REST Api

I'm building a Web application to access some informations about project-areas/team-areas | WorkItems | etc... I want to get thoses informations with Javascript and I used the REST Api / OSLC.

I'm facing some troubles with the authentification.
I don't know how can I create and manage the authentification to the server.
I have the username and password but what should I do with that ?

Is there a guide or tutorial to use the REST api with javascript ?

I tried to use curl in a php file but it didn't work (it returned me an empty string maybe because I was not logged at that time ?)...

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://<server>/ccm/rpt/repository");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_HEADER, 0);
$response = curl_exec($ch);
curl_close($ch);
echo $response;


Thanks in advance for your help !