Linkedin, API, OAuth – Se connecter et rapatrier des informations de la plate-forme Linkedin

	  <?php
    // Change these
    // define('API_KEY',      'YOUR_API_KEY_HERE'                                          );
    // define('API_SECRET',   'YOUR_API_SECRET_HERE'                                       );
    /* To change with your own credentials */
    define('API_KEY',      'msqi8kmf9dy4'                                          );
    define('API_SECRET',   'RP71sq5fGWwLMbsN'                                       );
 
 
 
    define('REDIRECT_URI', 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['SCRIPT_NAME']);
    define('SCOPE',        'r_fullprofile r_emailaddress rw_nus'                        );
 
    // You'll probably use a database
    session_name('linkedin');
    session_start();
 
    // OAuth 2 Control Flow
    if (isset($_GET['error'])) {
        // LinkedIn returned an error
        print $_GET['error'] . ': ' . $_GET['error_description'];
        exit;
    } elseif (isset($_GET['code'])) {
        // User authorized your application
        if ($_SESSION['state'] == $_GET['state']) {
            // Get token so you can make API calls
            getAccessToken();
        } else {
            // CSRF attack? Or did you mix up your states?
            exit;
        }
    } else { 
        if ((empty($_SESSION['expires_at'])) || (time() > $_SESSION['expires_at'])) {
            // Token has expired, clear the state
            $_SESSION = array();
        }
        if (empty($_SESSION['access_token'])) {
            // Start authorization process
            getAuthorizationCode();
        }
    }
 
    define ('_SOURCE_LINKEDIN_', '/v1/people/~:(id,first-name,last-name,headline,industry)');
 
    $user = fetch('GET', ''._SOURCE_LINKEDIN_.'');
    // http://api.linkedin.com/
    /*  http://developer.linkedin.com/apis */
 
    print (''.$user->id.'');
    echo ('<br>');
 
    print (''.$user->firstName.'');
    echo ('<br>');
 
    print (''.$user->lastName.'');
    echo ('<br>');
 
    print (''.$user->headline.'');
    echo ('<br>');
 
    /*
    print (''.$user->picture-url.'');
    echo ('<br>');
    */
    print (''.$user->industry.'');
    echo ('<br>');
 
 
    // print "Hello $user->firstName $user->lastName.";
 
    exit;
 
    function getAuthorizationCode() {
        $params = array('response_type' => 'code',
                        'client_id' => API_KEY,
                        'scope' => SCOPE,
                        'state' => uniqid('', true), // unique long string
                        'redirect_uri' => REDIRECT_URI,
                  );
 
        // Authentication request
        $url = 'https://www.linkedin.com/uas/oauth2/authorization?' . http_build_query($params);
 
        // Needed to identify request when it returns to us
        $_SESSION['state'] = $params['state'];
 
        // Redirect user to authenticate
        header("Location: $url");
        exit;
    }
 
    function getAccessToken() {
        $params = array('grant_type' => 'authorization_code',
                        'client_id' => API_KEY,
                        'client_secret' => API_SECRET,
                        'code' => $_GET['code'],
                        'redirect_uri' => REDIRECT_URI,
                  );
 
        // Access Token request
        // 
        $url = 'https://www.linkedin.com/uas/oauth2/accessToken?' . http_build_query($params);
 
        // Tell streams to make a POST request
        $context = stream_context_create(
                        array('http' => 
                            array('method' => 'POST',
                            )
                        )
                    );
 
        // Retrieve access token information
        $response = file_get_contents($url, false, $context);
 
        // Native PHP object, please
        $token = json_decode($response);
 
        // Store access token and expiration time
        $_SESSION['access_token'] = $token->access_token; // guard this! 
        $_SESSION['expires_in']   = $token->expires_in; // relative time (in seconds)
        $_SESSION['expires_at']   = time() + $_SESSION['expires_in']; // absolute time
 
        return true;
    }
 
    function fetch($method, $resource, $body = '') {
        $params = array('oauth2_access_token' => $_SESSION['access_token'],
                        'format' => 'json',
                  );
 
        // Need to use HTTPS
        $url = 'https://api.linkedin.com' . $resource . '?' . http_build_query($params);
 
        // print_r($url);
        // Tell streams to make a (GET, POST, PUT, or DELETE) request
        $context = stream_context_create(
                        array('http' => 
                            array('method' => $method,
                            )
                        )
                    );
 
 
        // Hocus Pocus
        $response = file_get_contents($url, false, $context);
 
        // Native PHP object, please
        return json_decode($response);
    }
    ?>