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<?php
require_once(dirname(dirname(dirname(dirname(dirname(__FILE__))))) . '/oauth/libextinc/OAuth.php');
/**
* Authenticate using LinkedIn.
*
* @author Brook Schofield, TERENA.
* @package SimpleSAMLphp
*/
class sspmod_authlinkedin_Auth_Source_LinkedIn extends SimpleSAML_Auth_Source
{
/**
* The string used to identify our states.
*/
const STAGE_INIT = 'authlinkedin:init';
/**
* The key of the AuthId field in the state.
*/
const AUTHID = 'authlinkedin:AuthId';
private $key;
private $secret;
private $attributes;
/**
* Constructor for this authentication source.
*
* @param array $info Information about this authentication source.
* @param array $config Configuration.
*/
public function __construct($info, $config)
{
assert(is_array($info));
assert(is_array($config));
// Call the parent constructor first, as required by the interface
parent::__construct($info, $config);
if (!array_key_exists('key', $config))
throw new Exception('LinkedIn authentication source is not properly configured: missing [key]');
$this->key = $config['key'];
if (!array_key_exists('secret', $config))
throw new Exception('LinkedIn authentication source is not properly configured: missing [secret]');
$this->secret = $config['secret'];
if (array_key_exists('attributes', $config)) {
$this->attributes = $config['attributes'];
} else {
// Default values if the attributes are not set in config (ref https://developer.linkedin.com/docs/fields)
$this->attributes = 'id,first-name,last-name,headline,summary,specialties,picture-url,email-address';
}
}
/**
* Log-in using LinkedIn platform
* Documentation at: http://developer.linkedin.com/docs/DOC-1008
*
* @param array &$state Information about the current authentication.
*/
public function authenticate(&$state)
{
assert(is_array($state));
// We are going to need the authId in order to retrieve this authentication source later
$state[self::AUTHID] = $this->authId;
$stateID = SimpleSAML_Auth_State::getStateId($state);
SimpleSAML\Logger::debug('authlinkedin auth state id = ' . $stateID);
$consumer = new sspmod_oauth_Consumer($this->key, $this->secret);
// Get the request token
$requestToken = $consumer->getRequestToken(
'https://api.linkedin.com/uas/oauth/requestToken',
array('oauth_callback' => SimpleSAML\Module::getModuleUrl('authlinkedin') . '/linkback.php?stateid=' . $stateID)
);
SimpleSAML\Logger::debug(
"Got a request token from the OAuth service provider [" .
$requestToken->key . "] with the secret [" . $requestToken->secret . "]"
);
$state['authlinkedin:requestToken'] = $requestToken;
// Update the state
SimpleSAML_Auth_State::saveState($state, self::STAGE_INIT);
// Authorize the request token
$consumer->getAuthorizeRequest('https://www.linkedin.com/uas/oauth/authenticate', $requestToken);
}
public function finalStep(&$state)
{
$requestToken = $state['authlinkedin:requestToken'];
$consumer = new sspmod_oauth_Consumer($this->key, $this->secret);
SimpleSAML\Logger::debug(
"oauth: Using this request token [" .
$requestToken->key . "] with the secret [" . $requestToken->secret . "]"
);
// Replace the request token with an access token (via GET method)
$accessToken = $consumer->getAccessToken(
'https://api.linkedin.com/uas/oauth/accessToken', $requestToken,
array('oauth_verifier' => $state['authlinkedin:oauth_verifier'])
);
SimpleSAML\Logger::debug(
"Got an access token from the OAuth service provider [" .
$accessToken->key . "] with the secret [" . $accessToken->secret . "]"
);
$userdata = $consumer->getUserInfo(
'https://api.linkedin.com/v1/people/~:(' . $this->attributes . ')',
$accessToken,
array('http' => array('header' => 'x-li-format: json'))
);
$attributes = $this->flatten($userdata, 'linkedin.');
// TODO: pass accessToken: key, secret + expiry as attributes?
if (array_key_exists('id', $userdata)) {
$attributes['linkedin_targetedID'] = array('http://linkedin.com!' . $userdata['id']);
$attributes['linkedin_user'] = array($userdata['id'] . '@linkedin.com');
}
SimpleSAML\Logger::debug('LinkedIn Returned Attributes: '. implode(", ",array_keys($attributes)));
$state['Attributes'] = $attributes;
}
/**
* takes an associative array, traverses it and returns the keys concatenated with a dot
*
* e.g.:
*
* [
* 'linkedin' => [
* 'location' => [
* 'id' => '123456'
* 'country' => [
* 'code' => 'de'
* ]
* ]
* ]
*
* become:
*
* [
* 'linkedin.location.id' => [0 => '123456'],
* 'linkedin.location.country.code' => [0 => 'de']
* ]
*
* @param array $array
* @param string $prefix
*
* @return array the array with the new concatenated keys
*/
protected function flatten($array, $prefix = '')
{
$result = array();
foreach ($array as $key => $value) {
if (is_array($value)) {
$result = $result + $this->flatten($value, $prefix . $key . '.');
} else {
$result[$prefix . $key] = array($value);
}
}
return $result;
}
}
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