2018-03-20 09:51:47 +00:00
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<?php
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namespace Operations;
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require '../vendor/autoload.php';
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use \Exceptions\PluginNotFoundException as PluginNotFoundException;
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/**
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* This class provides user authentication for the application.
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* Its main purpose is to find the apropriate authentication
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* plugin. It also ensures that a user entry for that user is
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* in the database.
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*/
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class UserAuth
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{
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/** @var \Monolog\Logger */
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private $logger;
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/** @var \PDO */
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private $db;
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/** @var \Slim\Container */
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private $c;
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public function __construct(\Slim\Container $c)
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{
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$this->logger = $c->logger;
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$this->db = $c->db;
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$this->c = $c;
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}
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/**
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* Authenticates a user with username/password combination.
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*
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* @param $username Username
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* @param $password Password
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*
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* @return int -1 if authentication failed, the user id otherwise
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*
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* @throws \Exceptions\PluginNotFoundExecption if no matching backend can be found
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*/
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public function authenticate(string $username, string $password) : int
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{
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if (strpos($username, '/') === false) { // no explicit backend specification
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$backend = 'default';
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$name = $username;
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} else {
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$parts = preg_split('/\//', $username, 2);
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$backend = $parts[0];
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$name = $parts[1];
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}
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$this->logger->debug('Trying to authenticate with info', ['backend' => $backend, 'name' => $name]);
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try {
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if ($this->authenticateBackend($backend, $name, $password)) {
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return $this->localUser($backend, $name, $password);
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} else {
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return -1;
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}
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} catch (\Exceptions\PluginNotFoundException $e) {
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throw $e;
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}
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}
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/**
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* This function searches for an apropriate backend and calls it
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* to authenticate the user.
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*
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* @param $backend The name of the backend to use
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* @param $username The username to use
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* @param $password The password to use
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*
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* @return bool true if authentication successfull false otherwise
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*
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* @throws \Exceptions\PluginNotFoundExecption if no matching backend can be found
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*/
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private function authenticateBackend(string $backend, string $username, string $password) : bool
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{
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$config = $this->c['config']['authentication'];
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if (!array_key_exists($backend, $config)) { // Check if backend is configured for prefix
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$this->logger->warning('No authentication backend configured for prefix', ['prefix' => $backend]);
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throw new PluginNotFoundException('No authentication backend configured for this user.');
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}
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$plugin = $config[$backend]['plugin'];
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$pluginClass = '\\Plugins\\UserAuth\\' . $plugin;
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$pluginConfig = $config[$backend]['config'];
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if (!class_exists($pluginClass)) { // Check if given backend class exists
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$this->logger->error('The configured UserAuth plugin does not exist', ['prefix' => $backend, 'plugin' => $plugin]);
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throw new PluginNotFoundException('The authentication request can not be processed.');
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}
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//Try to create class with given name
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$backendObj = new $pluginClass($this->logger, $this->db, $pluginConfig);
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if (!$backendObj instanceof \Plugins\UserAuth\InterfaceUserAuth) { // Check if class implements interface
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$this->logger->error('The configured plugin does not implement InterfaceUserAuth', ['plugin' => $plugin, 'prefix' => $backend]);
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throw new PluginNotFoundException('The authentication request can not be processed.');
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}
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$this->logger->debug("UserAuth plugin was loaded", ['plugin' => $plugin, 'prefix' => $backend]);
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return $backendObj->authenticate($username, $password);
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}
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/**
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* Ensures the user from the given backend has a entry in the local database,
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* then returns the user id.
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*
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* @param $backend The name of the backend to use
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* @param $username The username to use
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* @param $password The password to use
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*
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* @return int The local user id
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*/
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private function localUser(string $backend, string $username, string $password) : int
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{
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2018-03-21 15:49:52 +00:00
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$config = $this->c['config']['authentication'];
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$backendId = $config[$backend]['plugin'];
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2018-03-20 09:51:47 +00:00
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$this->db->beginTransaction();
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$query = $this->db->prepare('SELECT id FROM users WHERE name=:name AND backend=:backend');
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$query->bindValue(':name', $username, \PDO::PARAM_STR);
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2018-03-21 15:49:52 +00:00
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$query->bindValue(':backend', $backendId, \PDO::PARAM_STR);
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2018-03-20 09:51:47 +00:00
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$query->execute();
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$record = $query->fetch();
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if ($record === false) {
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$insert = $this->db->prepare('INSERT INTO users (name,backend,type) VALUES (:name, :backend, \'user\')');
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$insert->bindValue(':name', $username, \PDO::PARAM_STR);
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2018-03-21 15:49:52 +00:00
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$insert->bindValue(':backend', $backendId, \PDO::PARAM_STR);
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2018-03-20 09:51:47 +00:00
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$insert->execute();
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$query->execute();
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$record = $query->fetch();
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2018-03-21 15:49:52 +00:00
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$this->logger->info('Non existing user created', ['username' => $username, 'backendId' => $backendId, 'newId' => $record['id']]);
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2018-03-20 09:51:47 +00:00
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} else {
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2018-03-21 15:49:52 +00:00
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$this->logger->debug('User was found in database', ['username' => $username, 'backendId' => $backendId, 'id' => $record['id']]);
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2018-03-20 09:51:47 +00:00
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}
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$this->db->commit();
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return $record['id'];
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}
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}
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