AzharProvider.php
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AzharProvider.php
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	<?php

	/**
	* _, __, _, _ __, _ _, _, _
	* / \ \|_) (_ \| \| \ \| /_\ \|\ \|
	* \ / \|_) , ) \| \|_/ \| \| \| \| \\|
	* ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
	*
	* Azhàr provider authentication method class
	*
	* @package ObsidianWorkspaces
	* @subpackage Auth
	* @author Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
	* @license http://www.opensource.org/licenses/bsd-license.php BSD
	* @filesource
	*/

	/**
	* Azhàr provider authentication method class
	*
	* Azhàr sends a document providing authentication and registration of new users.
	* It's signed by a shared secret key.
	*/
	class AzharProvider extends AuthenticationMethod {
	/**
	* @var string Shared secret key
	*/
	public $secretKey;

	/**
	* @var string Client key, to identify the consumer application.
	*/
	public $clientKey;

	/**
	* @var string The Azhàr identity provider login URL
	*/
	public $url;

	/**
	* Handles user login request
	*/
	public function handleRequest () {
	$action = array_key_exists('action', $_GET) ? $_GET['action'] : '';
	$sessionKey = array_key_exists('sessionKey', $_GET) ? $_GET['sessionKey'] : '';

	if ($action == "user.login.azhar.initialize") {
	//Redirects user to Azhàr SSO service
	$callbackUrl = get_server_url() . get_url($this->context->workspace->code)
	. '?action=user.login.azhar.success&authenticationMethodId=' . $this->id;
	$url = $this->url . '?mode=provider&key=' . $this->clientKey
	. '&sessionKey=' . $this->getSessionKey()
	. '&url=' . urlencode($callbackUrl);
	header('Location: ' . $url);
	exit;
	} elseif ($action == "user.login.azhar.success") {
	//User claims to have logged in, we can get authentication information
	$reply = $this->fetchInformation();

	if (!$this->isDocumentLegit($reply)) {
	$this ->loginError = Language::get('ExternalLoginNotLegitReply');
	return;
	}

	if ($reply->status == "SUCCESS") {
	//Creates user or login
	$this->name = $reply->username;
	$this->email = $reply->email;
	$this->remoteUserId = $reply->localUserId;
	$this->signInOrCreateUser();
	return;
	} elseif ($reply->status == "ERROR_USER_SIDE") {
	switch ($reply->code) {
	case 'NO_USER_VISIT':
	case 'NOT_LOGGED_IN':
	$this ->loginError = Language::get('ExternalLoginNotRemotelyLoggedIn');
	return;
	}
	} elseif ($reply->status == "ERROR_BETWEEN_US") {
	switch ($reply->code) {
	case 'SESSION_BADSECRET':
	$this->loginError = sprintf(Language::get('ExternalLoginTechnicalDifficulty'), $reply->code);
	return;
	}
	}

	$this->loginError = '<p>An unknown error has been received:</p><pre>' . print_r($reply, true) . '</pre><p>Please notify technical support about this new error message, so we can handle it in the future.</p>';
	} else {
	$this ->loginError = '<p>Unknown action: $action</p>';
	}
	}

	/**
	* Gets Azhàr provider session key
	*
	* This key allows us as consumer to fetch information, and Azhàr as provider to store it.
	*
	* @return string the session key
	*/
	public function getSessionKey () {
	$hash = md5($this->id);
	if (!isset($_SESSION['Auth-$hash']['SessionKey'])) {
	$url = $this->url . '?mode=provider.announce&key=' . $this->clientKey
	. '&url=n/a';
	$reply = self::query($url);
	$this->setSessionSecret($reply->sessionSecret);
	$_SESSION['Auth-$hash']['SessionKey'] = $reply->sessionKey;
	}
	return $_SESSION['Auth-$hash']['SessionKey'];
	}

	/**
	* Gets Azhàr provider session secret
	*
	* @return string the session secret
	*/
	private function getSessionSecret () {
	$hash = md5($this->id);
	return $_SESSION['Auth-$hash']['SessionSecret'];
	}

	/**
	* Sets Azhàr provider session secret
	*
	* @param string $secret the session secret
	*/
	private function setSessionSecret ($secret) {
	$hash = md5($this->id);
	$_SESSION['Auth-$hash']['SessionSecret'] = $secret;
	}

	/**
	* Gets Azhàr external authentication link
	*
	* @retrun string the login link
	*/
	public function getAuthenticationLink() {
	$url = get_server_url() . get_url($this->context->workspace->code)
	. '?action=user.login.azhar.initialize&authenticationMethodId=' . $this->id;
	return $url;
	}

	/**
	* Determines if the document received has been signed by the correct shared secret key.
	*
	* @return boolean true if the document is legit; otherwise, false.
	*/
	function isDocumentLegit ($document) {
	$hash = '';
	$claimedHash = NULL;
	foreach ($document as $key => $value) {
	if ($key == 'hash') {
	$claimedHash = $value;
	continue;
	}

	$hash .= md5($key . $value);
	}

	$salt = '$2y$10$' . substr($this->secretKey, 0, 22);
	$computedHash = crypt($hash, $salt);

	return $claimedHash === $computedHash;
	}

	/**
	* Fetches information document
	*
	* @return stdClass The Azhàr identity provider information about the current login operation
	*/
	function fetchInformation () {
	$url = $this->url . '?mode=provider.fetch&key=' . $this->clientKey
	. '&sessionSecret=' . $this->getSessionSecret()
	. '&sessionKey=' . $this->getSessionKey()
	. '&url=n/a';
	return self::query($url);
	}

	/**
	* Gets the contents of the specified URL and decode the JSON reply
	*
	* @param string $url The URL to the JSON document to query.
	* @return stdClass The reply
	*/
	public static function query ($url) {
	$data = file_get_contents($url);
	return json_decode($data);
	}

	/**
	* Loads a AzharProvider instance from a generic object. Typically used to deserialize a JSON document.
	*
	* @param object $data The object to deserialize
	* @return AzharProvider The deserialized instance
	*/
	public static function loadFromObject ($data) {
	$instance = parent::loadFromObject($data);

	$instance->url = $data->url;
	$instance->secretKey = $data->secretKey;
	$instance->clientKey = $data->clientKey;

	return $instance;
	}
	}

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