Subversion Repositories Applications.referentiel

<?php
// In : utf8 url_encoded (get et post)
// Out : utf8

// TODO : gerer les retours : dans ce controleur : code retour et envoi ...
class JRest {

        /** Parsed configuration file */
    private static $config;

        /** The HTTP request method used. */
        private $method = 'GET';

        /** The HTTP request data sent (if any). */
        private $requestData = NULL;

        /** Nom resource. */
        private $resource = NULL;

        /** Identifiant unique resource. */
        private $uid = NULL;

        /**
         * Constructor. Parses the configuration file "JRest.ini", grabs any request data sent, records the HTTP
         * request method used and parses the request URL to find out the requested resource
         * @param str iniFile Configuration file to use
         */
        public function JRest($iniFile = 'jrest.ini.php') {
                // Chargement de la configuration
                self::$config = parse_ini_file($iniFile, TRUE);
                // Enregistrement de la méthode gérant l'autoload des classes
                spl_autoload_register(array('JRest', 'chargerClasse'));
                
                if (isset($_SERVER['REQUEST_URI']) && isset($_SERVER['REQUEST_METHOD']) && isset($_SERVER['QUERY_STRING'])) {
                        if (isset($_SERVER['CONTENT_LENGTH']) && $_SERVER['CONTENT_LENGTH'] > 0) {
                                $this->requestData = '';
                                $httpContent = fopen('php://input', 'r');
                                while ($data = fread($httpContent, 1024)) {
                                        $this->requestData .= $data;
                                }
                                fclose($httpContent);
                        }
                        if (strlen($_SERVER['QUERY_STRING']) == 0) {
                                $len = strlen($_SERVER['REQUEST_URI']);
                        } else {
                                $len = -(strlen($_SERVER['QUERY_STRING']) + 1);
                        }
                        $urlString = substr($_SERVER['REQUEST_URI'], strlen(self::$config['settings']['baseURL']), $len);

                        $urlParts = explode('/', $urlString);

                        if (isset($urlParts[0])) $this->resource = $urlParts[0];
                        if (count($urlParts) > 1 && $urlParts[1] != '') {
                                array_shift($urlParts);
                                foreach ($urlParts as $uid) {
                                        if ($uid != '') {
                                                $this->uid[] = urldecode($uid);
                                        }
                                }
                        }

                        $this->method = $_SERVER['REQUEST_METHOD'];
                } else {
                        trigger_error('I require the server variables REQUEST_URI, REQUEST_METHOD and QUERY_STRING to work.', E_USER_ERROR);
                }
        }

        /**
        * La méthode __autoload() charge dynamiquement les classes trouvées dans le code.
        * Cette fonction est appelée par php5 quand il trouve une instanciation de classe dans le code.
        *
        *@param string le nom de la classe appelée.
        *@return void le fichier contenant la classe doit être inclu par la fonction.
        */
        public static function chargerClasse($classe) {
                if (class_exists($classe)) {
                        return null;
                }
                
                $chemins = array('', self::$config['settings']['servicesDir']);
                foreach ($chemins as $chemin) {
                        $chemin = $chemin.$classe.'.php';
                        if (file_exists($chemin)) {
                                require_once $chemin;
                        }
                }
        }
        
        
        /**
         * Execute the request.
         */
        function exec() {
                switch ($this->method) {
                        case 'GET':
                                $this->get();
                                break;
                        case 'POST':
                                $this->post();
                                break;
                        case 'DELETE':
                                $this->delete();
                                break;
                        case 'PUT':
                                $this->add();
                                break;
                }
        }

        /**
         * Execute a GET request. A GET request fetches a list of resource when no resource name is given, a list of element
         * when a resource name is given, or a resource element when a resource and resource unique identifier are given. It does not change the
         * database contents.
         */
        private function get() {
                if ($this->resource) {
                        $resource_file = self::$config['settings']['servicesDir'].ucfirst($this->resource).'.php';
                        $resource_class = ucfirst($this->resource);
                        if (file_exists($resource_file))  {
                                include_once $resource_file;
                                if (class_exists($resource_class)) {
                                        $service = new $resource_class(self::$config);
                                        if ($this->uid) { // get a resource element
                                                if (method_exists($service, 'getElement')) {
                                                        $service->getElement($this->uid);
                                                }
                                        } elseif (method_exists($service, 'getRessource')) { // get all elements of a ressource
                                                $service->getRessource();
                                        }
                                }
                        }
                } else { // get resources
                        // include set.jrest.php, instanticiation et appel
                }
        }

        private function post() {
                $pairs = array();
                // Récupération des paramètres passés dans le contenu de la requête HTTP (= POST)
                if ($this->requestData) {
                        $pairs = $this->parseRequestData();
                }

                // Ajout des informations concernant l'upload de fichier passées dans la variable $_FILE
                if(isset($_FILES)) {
                        foreach ($_FILES as $v) {
                                $pairs[$v['name']] = $v;
                        }

                        // Ne pas effacer cette ligne ! Elle est indispensable pour les services du Carnet en ligne
                        // qui n'utilisent que le tableau pairs dans les posts
                        $pairs = array_merge($pairs, $_POST);
                }

                // gestion du contenu du post
                if(isset($_POST))
                {
                        // Safari ne sait pas envoyer des DELETE avec gwt...
                        // Nous utilisons le parametre "action" passé dans le POST qui doit contenir DELETE pour lancer la supression
                        if ($pairs['action'] == 'DELETE') {
                                $this->delete();
                                return;
                        }

                        if (count($pairs) != 0) {
                                if ($this->uid) { // get a resource element
                                        $resource_file = self::$config['settings']['servicesDir'].ucfirst($this->resource).'.php';
                                        $resource_class = ucfirst($this->resource);
                                        if (file_exists($resource_file)) {
                                                include_once $resource_file;
                                                if (class_exists($resource_class)) {
                                                        $service = new $resource_class(self::$config);
                                                        if (method_exists($service,'updateElement')) { // Update element
                                                                // TODO : a voir le retour ...
                                                                if ($service->updateElement($this->uid, $pairs)) {
                                                                        $this->created();
                                                                }
                                                        }
                                                }
                                        }
                                } else { // get all elements of a ressource
                                        $this->add($pairs);
                                }
                        } else {
                                $this->lengthRequired();
                        }
                }
        }

        private function delete() {
                $resource_file = self::$config['settings']['servicesDir'].ucfirst($this->resource).'.php';
                $resource_class = ucfirst($this->resource);
                if (file_exists($resource_file)) {
                        include_once $resource_file;
                        if (class_exists($resource_class)) {
                                $service = new $resource_class(self::$config);
                                if ($this->uid) { // get a resource element
                                        if (method_exists($service, 'deleteElement')) { // Delete element
                                                if ($service->deleteElement($this->uid)) {
                                                        $this->noContent();
                                                }
                                        }
                                }
                        }
                }
        }

        private function add($pairs = null) {
                if (is_null($pairs)) {
                        $pairs = array();
                        // Récupération des paramètres passés dans le contenu de la requête HTTP (= POST)
                        // FIXME : vérifier que l'on récupère bien les données passées par PUT
                        if ($this->requestData) {
                                $pairs = $this->parseRequestData();
                        }
                }

                if (count($pairs) != 0) {
                        $resource_file = self::$config['settings']['servicesDir'].ucfirst($this->resource).'.php';
                        $resource_class = ucfirst($this->resource);
                        if (file_exists($resource_file)) {
                                include_once $resource_file;
                                if (class_exists($resource_class)) {
                                        $service = new $resource_class(self::$config);
                                        if (method_exists($service,'createElement')) { // Create a new element
                                                if ($service->createElement($pairs)) {
                                                        $this->created();
                                                }
                                        }
                                }
                        }
                } else {
                        $this->lengthRequired();
                }
        }

        /**
         * Parse the HTTP request data.
         * @return str[] Array of name value pairs
         */
        private function parseRequestData() {
                $values = array();
                $pairs = explode(self::$config['settings']['argSeparatorInput'], $this->requestData);
                foreach ($pairs as $pair) {
                        $parts = explode('=', $pair);
                        if (isset($parts[0]) && isset($parts[1])) {
                                $parts[1] = rtrim(urldecode($parts[1]));
                                $values[$parts[0]] = $parts[1];
                        }
                }
                return $values;
        }

        /**
         * Send a HTTP 201 response header.
         */
        private function created($url = FALSE) {
                header('HTTP/1.0 201 Created');
                if ($url) {
                        header('Location: '.$url);
                }
        }

        /**
         * Send a HTTP 204 response header.
         */
        private function noContent() {
                header('HTTP/1.0 204 No Content');
        }

        /**
         * Send a HTTP 400 response header.
         */
        private function badRequest() {
                header('HTTP/1.0 400 Bad Request');
        }

        /**
         * Send a HTTP 401 response header.
         */
        private function unauthorized($realm = 'JRest') {
                if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW'])) {
                        header('WWW-Authenticate: Basic realm="'.$realm.'"');
                }
                header('HTTP/1.0 401 Unauthorized');
        }

        /**
         * Send a HTTP 404 response header.
         */
        private function notFound() {
                header('HTTP/1.0 404 Not Found');
        }

        /**
         * Send a HTTP 405 response header.
         */
        private function methodNotAllowed($allowed = 'GET, HEAD') {
                header('HTTP/1.0 405 Method Not Allowed');
                header('Allow: '.$allowed);
        }

        /**
         * Send a HTTP 406 response header.
         */
        private function notAcceptable() {
                header('HTTP/1.0 406 Not Acceptable');
                echo join(', ', array_keys(self::$config['renderers']));
        }

        /**
         * Send a HTTP 411 response header.
         */
        private function lengthRequired() {
                header('HTTP/1.0 411 Length Required');
        }

        /**
         * Send a HTTP 500 response header.
         */
        private function internalServerError() {
                header('HTTP/1.0 500 Internal Server Error');
        }
}
?>