使用 PHP 从 OAuth REST API 获取LinkedIn配置文件

我用了这个网站：http://blog.thewebcafes.com/post/1502524959/php-step-by-step-oauth-for-dummies-based-on

创建以下 PHP 页面：

<?php
  if(!isset($_SESSION)){session_start();}
  define('LINKEDIN_KEY', '**************');
  define('LINKEDIN_SECRET', '****************');
  //Prepare The Links
  $links = array(
    'request_token'=>'https://api.linkedin.com/uas/oauth/requestToken',
    'authorize'=>'https://www.linkedin.com/uas/oauth/authorize',
    'access_token'=>'https://api.linkedin.com/uas/oauth/accessToken'
  );
  //Validate Parameters Passed Back by LinkedIn
  if(isset($_GET['oauth_token']) && isset($_GET['oauth_verifier']) && $_GET['oauth_token']==$_SESSION['linkedin_oauth_token']) {
    //we have user permission, let's get a token
    getAccessToken();
    getProfile();
  }else {
    //we don't have an authed user yet, let's ask for permission
    authUser();
  }
  function urlencode_oauth($str) {
    return str_replace('+',' ',str_replace('%7E','~',rawurlencode($str)));
  }
  function getProfile() {
    global $links;
    //Prepare OAuth Parameters
    $params = array(
      'oauth_consumer_key'=>LINKEDIN_KEY,
      'oauth_nonce'=>sha1(microtime()),
      'oauth_signature_method'=>'HMAC-SHA1',
      'oauth_timestamp'=>time(),
      'oauth_token'=>$_SESSION['linkedin_access_token'],
      'oauth_version'=>'1.0'
    );
    //Prepare The Base String
    // sort parameters according to ascending order of key
    ksort($params);
    // prepare URL-encoded query string
    $q = array();
    foreach ($params as $key=>$value) {
      $q[] = urlencode_oauth($key).'='.urlencode_oauth($value);
    }
    $q = implode('&',$q);
    // generate the base string for signature
    $parts = array(
      'GET',
      urlencode_oauth('https://api.linkedin.com/v1/people/~:(id,num-connections,picture-url)?format=json'),
      urlencode_oauth($q)
    );
    $base_string = implode('&',$parts);
    //Get The Signature
    $key = urlencode_oauth(LINKEDIN_SECRET) . '&' . urlencode_oauth($_SESSION['linkedin_access_token_secret']);
    $signature = base64_encode(hash_hmac('sha1',$base_string,$key,true));
    //Put the Signature into Parameters and Prepare Authorization Header
    $params['oauth_signature'] = $signature;
    $str = array();
    foreach ($params as $key=>$value) {
      $str[] = $key . '="'.urlencode_oauth($value).'"';
    }
    $str = implode(', ',$str);
    $headers = array(
      'GET /v1/people/~ HTTP/1.1',
      'Host: api.linkedin.com',
      'Authorization: OAuth '.$str,
      'Connection: Keep-Alive',
      'Content-Type: application/json',
      'x-li-format: json'
    );
    //Send GET Request To LinkedIn
    $fp = fsockopen("ssl://api.linkedin.com",443,$errno,$errstr,30);
    if(!$fp) { echo 'Unable to connect to LinkedIn'; exit(); }
    $out = implode("'r'n",$headers)."'r'n'r'n".$xml . "'r'n'r'n";
    fputs($fp,$out);
    // getting LinkedIn server response
    $res = '';
    while (!feof($fp)) $res .= fgets($fp,4096);
    fclose($fp);
    echo 'RESPONSE: ' . $res;
    //Make sure the GET is successful
    $parts = explode("'n'n",str_replace("'r","",$res));
    $headers = explode("'n",$parts[0]);
    if ($headers[0] != 'HTTP/1.1 201 Created') { echo 'Failed'; }
  }
  function getAccessToken() {
    global $links;
    //Prepare OAuth Parameters
    $params = array(
      'oauth_consumer_key'=>LINKEDIN_KEY,
      'oauth_nonce'=>sha1(microtime()),
      'oauth_signature_method'=>'HMAC-SHA1',
      'oauth_timestamp'=>time(),
      'oauth_token'=>$_GET['oauth_token'],
      'oauth_verifier'=>$_GET['oauth_verifier'],
      'oauth_version'=>'1.0'
    );
    //Prepare The Base String
    // sort parameters according to ascending order of key
    ksort($params);
    // prepare URL-encoded query string
    $q = array();
    foreach ($params as $key=>$value) {
      $q[] = urlencode_oauth($key).'='.urlencode_oauth($value);
    }
    $q = implode('&',$q);
    // generate the base string for signature
    $parts = array(
      'POST',
      urlencode_oauth($links['access_token']),
      urlencode_oauth($q)
    );
    $base_string = implode('&',$parts);
    //Get The Signature
    $key = urlencode_oauth(LINKEDIN_SECRET) . '&' . urlencode_oauth($_SESSION['linkedin_oauth_token_secret']);
    $signature = base64_encode(hash_hmac('sha1',$base_string,$key,true));
    //Put the Signature into Parameters and Prepare Authorization Header
    $params['oauth_signature'] = $signature;
    $str = array();
    foreach ($params as $key=>$value) {
      $str[] = $key . '="'.urlencode_oauth($value).'"';
    }
    $str = implode(', ',$str);
    $headers = array(
      'POST /uas/oauth/accessToken HTTP/1.1',
      'Host: api.linkedin.com',
      'Authorization: OAuth '.$str,
      'Content-Type: text/xml;charset=UTF-8',
      'Content-Length: 0',
      'Connection: close'
    );
    //Send POST Request To LinkedIn
    $fp = fsockopen("ssl://api.linkedin.com",443,$errno,$errstr,30);
    if (!$fp) { echo 'Unable to connect to LinkedIn'; exit(); }
    $out = implode("'r'n",$headers) . "'r'n'r'n";
    fputs($fp,$out);
    // getting LinkedIn server response
    $res = '';
    while (!feof($fp)) $res .= fgets($fp,4096);
    fclose($fp);
    //Parse the Response to Get The Access Token and Secret
    $parts = explode("'n'n",str_replace("'r",'',$res));
    $res_headers = explode("'n",$parts[0]);
    if ($res_headers[0] != 'HTTP/1.1 200 OK') {
      echo 'Error getting access token and secret.'; exit();
    }
    parse_str($parts[1],$data);
    if (empty($data['oauth_token'])) {
      echo 'Failed to get LinkedIn access token.'; exit();
    }
    //Save the Request Token and Secret
    $_SESSION['linkedin_access_token'] = $data['oauth_token'];
    $_SESSION['linkedin_access_token_secret'] = $data['oauth_token_secret'];
    // unset the Request Token (not needed anymore)
    unset($_SESSION['linkedin_oauth_token']);
    unset($_SESSION['linkedin_oauth_token_secret']);
  }
  function authUser() {
    global $links;
    //Prepare OAuth Parameters
    $params = array(
      'oauth_callback'=>"https://sxsw.ampthealth.com/linkedin_callback.php",
      'oauth_consumer_key'=>LINKEDIN_KEY,
      'oauth_nonce'=>sha1(microtime()),
      'oauth_signature_method'=>'HMAC-SHA1',
      'oauth_timestamp'=>time(),
      'oauth_version'=>'1.0'
    );
    //Prepare The Base String
    // sort parameters according to ascending order of key
    ksort($params);
    // prepare URL-encoded query string
    $q = array();
    foreach ($params as $key=>$value) {
      $q[] = urlencode_oauth($key).'='.urlencode_oauth($value);
    }
    $q = implode('&',$q);
    // generate the base string for signature
    $parts = array(
      'POST',
      urlencode_oauth($links['request_token']),
      urlencode_oauth($q)
    );
    $base_string = implode('&',$parts);
    //Get The Signature
    $key = urlencode_oauth(LINKEDIN_SECRET) . '&';
    $signature = base64_encode(hash_hmac('sha1',$base_string,$key,true));
    //Put the Signature into Parameters and Prepare Authorization Header
    $params['oauth_signature'] = $signature;
    $str = array();
    foreach ($params as $key=>$value) {
      $str[] = $key . '="'.urlencode_oauth($value).'"';
    }
    $str = implode(', ',$str);
    $headers = array(
      'POST /uas/oauth/requestToken HTTP/1.1',
      'Host: api.linkedin.com',
      'Authorization: OAuth '.$str,
      'Content-Type: text/xml;charset=UTF-8',
      'Content-Length: 0',
      'Connection: close'
    );
    //Send POST Request To LinkedIn
    $fp = fsockopen("ssl://api.linkedin.com",443,$errno,$errstr,30);
    if (!$fp) { echo 'Unable to connect to LinkedIn'; exit(); }
    $out = implode("'r'n",$headers) . "'r'n'r'n";
    fputs($fp,$out);
    // getting LinkedIn server response
    $res = '';
    while (!feof($fp)) $res .= fgets($fp,4096);
    fclose($fp);
    //Parse the Response to Get OAuth Token and Secret
    $parts = explode("'n'n",str_replace("'r",'',$res));
    $res_headers = explode("'n",$parts[0]);
    if ($res_headers[0] != 'HTTP/1.1 200 OK') {
      echo 'Error getting OAuth token and secret.'; exit();
    }
    parse_str($parts[1],$data);
    if (empty($data['oauth_token'])) {
      echo 'Failed to get LinkedIn request token.'; exit();
    }
    //Save the Request Token and Secret
    $_SESSION['linkedin_oauth_token'] = $data['oauth_token'];
    $_SESSION['linkedin_oauth_token_secret'] = $data['oauth_token_secret'];
    //Redirect your user to LinkedIn with the request token
    header('Location: '.$links['authorize'].'?oauth_token='.urlencode($data['oauth_token']));
    exit();
  }
?>

能够让用户授权并请求访问令牌，但是在获取基本配置文件时，我收到一个错误：401 未经授权的服务器。我的getProfile函数一定有问题，但我对我错过了什么有点迷茫。