Subversion Repositories Applications.framework

<?php
// declare(encoding='UTF-8');
/**
* Classe client permettant d'interroger des services web REST.
*
* @category             php 5.2
* @package              Framework
* @author               Jean-Pascal MILCENT <jpm@tela-botanica.org>
* @copyright    Copyright (c) 2010, Tela Botanica (accueil@tela-botanica.org)
* @license              CeCILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-fr.txt>
* @license              GNU-GPL <http://www.gnu.org/licenses/gpl.html>
* @since                0.2
*/
class RestClient {
        const HTTP_URL_REQUETE_SEPARATEUR = '&';
        const HTTP_URL_REQUETE_CLE_VALEUR_SEPARATEUR = '=';
        private $http_methodes = array('GET', 'POST', 'PUT', 'DELETE', 'HEAD', 'OPTIONS', 'CONNECT', 'TRACE');
        protected $parametres = null;
        private $url = null;
        private $reponse_entetes = null;
        private $tracer_ip_source = null;
        private $requete_headers = array();
        
        public function __construct() {
        //verifie si paramètre tracer_ip_source est sur TRUE dans config.ini
                    if (Config::existe('tracer_ip_source')) { 
                        //lire la config
                        $valeur = Config::get('tracer_ip_source');
                        //si oui, active X-Forwarded-For                      
                        $this->setTracerIPSource($valeur);
            }
            //pas de else, si pas dans la config $tracer_ip_source sera NULL/FALSE
         }
        //+------------------------------------------------------------------------------------------------------+
        // ACCESSEURS

        public function getReponseEntetes() {
                return $this->reponse_entetes;
        }

        public function getParametre($cle) {
                $valeur = (isset($this->parametres[$cle])) ? $this->parametres[$cle] : null;
                return $valeur;
        }

        public function ajouterParametre($cle, $valeur) {
                $this->parametres[$cle] = $valeur;
        }

        public function supprimerParametre($cle) {
                unset($this->parametres[$cle]);
        }

        public function nettoyerParametres() {
                $this->parametres = null;
        }
        
        public function setTracerIPSource($valeur) {
                $this->tracer_ip_source = $valeur;
        }
        
        //+------------------------------------------------------------------------------------------------------+
        // MÉTHODES

        public function consulter($url) {
                $retour = $this->envoyerRequete($url, 'GET');
                return $retour;
        }

        public function ajouter($url, Array $donnees) {
                $retour = $this->envoyerRequete($url, 'PUT', $donnees);
                return $retour;
        }

        public function modifier($url, Array $donnees) {
                $retour = $this->envoyerRequete($url, 'POST', $donnees);
                return $retour;
        }

        public function supprimer($url) {
                $retour = $this->envoyerRequete($url, 'DELETE');
                return $retour;
        }

        public function envoyerRequete($url, $mode, Array $donnees = array()) {
                $contenu = false;
                if (FALSE && function_exists('curl_init') && $mode == 'GET') {
                        // nous n'activons le wrapper que pour GET pour l'instant
                        // car l'utilisation de curl pour les autres modes pourrait
                        // vraisemblablement induire des comportements différents. (test-suite needed)
                        $contenu = $this->envoyerCurlRequete($url, $mode, $donnees);
                } else {
                        $contenu = $this->envoyerStreamRequete($url, $mode, $donnees);
                }
                return $contenu;
        }

        private function envoyerStreamRequete($url, $mode, Array $donnees = array()) {
                $this->url = $url;
                $contenu = false;
                if (! in_array($mode, $this->http_methodes)) {
                        $e = "Le mode de requête '$mode' n'est pas accepté!";
                        trigger_error($e, E_USER_WARNING);
                } else {
                    if ($mode == 'GET') {
                                $this->traiterUrlParametres();
                        }
                    $content = http_build_query($donnees, null, self::HTTP_URL_REQUETE_SEPARATEUR);
                    $this->requete_headers['http'] = array();
                    $this->requete_headers['http']['method'] = $mode;
                    $this->requete_headers['http']['header'] = "Content-type: application/x-www-form-urlencoded\r\n";
                    if ($this->tracer_ip_source) {
                        // ajoute  X-Forwarded-For au header
                        $this->requete_headers['http']['header'] .= "X-Forwarded-For: {$_SERVER['REMOTE_ADDR']}, {$_SERVER['SERVER_ADDR']}\r\n";
                    }
                    $this->requete_headers['http']['header'] .= "User-Agent: {$_SERVER['HTTP_USER_AGENT']} ApiTela/";
                    $this->requete_headers['http']['header'] .= Framework::getInfoAppli('nom');
                    $this->requete_headers['http']['header'] .= "\r\n";
                    $this->requete_headers['http']['content'] = $content;                       
                        $contexte = stream_context_create($this->requete_headers);
                        $flux = @fopen($this->url, 'r', false, $contexte);                        
                        if (!$flux) {
                                $entetesFmt = print_r($this->analyserEntete(), true);
                                $e = "Echec requête '$mode' : {$this->url}\n".
                                        "Paramètres requête : $content \n".
                                        "Entêtes réponse : $entetesFmt \n";
                                trigger_error($e, E_USER_WARNING);
                        } else {
                                // Informations sur les en-têtes et métadonnées du flux
                                $this->reponse_entetes = stream_get_meta_data($flux);

                                // Contenu actuel de $url
                                $contenu = stream_get_contents($flux);

                                fclose($flux);
                        }
                        $this->traiterEntete();
                }
                $this->reinitialiser();
                return $contenu;
        }

        private function envoyerCurlRequete($url, $mode, Array $donnees = array()) {
                $this->url = $url;
                $contenu = false;
                if (! in_array($mode, $this->http_methodes)) {
                        $e = "Le mode de requête '$mode' n'est pas accepté!";
                        trigger_error($e, E_USER_WARNING);
                } else {
                        if ($mode == 'GET') {
                                $this->traiterUrlParametres();
                        }

                        $ch = curl_init($this->url);
                        curl_setopt($ch, CURLOPT_HEADER, TRUE);
                        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
                        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
                        if ($mode == 'POST') {
                                curl_setopt($ch, CURLOPT_POST, TRUE);
                        } elseif ($mode == 'PUT') {
                                curl_setopt($ch, CURLOPT_PUT, TRUE);
                        } elseif($mode == 'DELETE') {
                                curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
                        }

                        $content = '';
                        if ($donnees) {
                                $content = http_build_query($donnees, null, self::HTTP_URL_REQUETE_SEPARATEUR);
                                curl_setopt($ch, CURLOPT_POSTFIELDS, $content);
                        }

                        $flux = curl_exec($ch);
                        curl_close($ch);

                        if (!$flux) {
                                $this->reponse_entetes = $http_response_header;
                                $entetesFmt = print_r($this->analyserEntete(), true);
                                $msgTpl = "Echec requête (CURL) '%s' : %s\nParamètres requête : %s \nEntêtes réponse : %s \n";
                                $msg = sprintf($msgTpl, strtoupper($mode), $this->url, $content, $entetesFmt);
                                trigger_error($msg, E_USER_WARNING);
                        } else {
                                // attention, CURLOPT_FOLLOWLOCATION amène le stream à contenir plusieurs section d'header HTTP successives
                                $t = explode("\r\n\r\n", $flux);
                                $contenu = array_splice($t, -1);
                                $dernier_entete = array_splice($t, -1);
                                $contenu = $contenu[0];
                                $dernier_entete = $dernier_entete[0];

                                // XXX: mimic stream_get_meta_data() (ce qui n'est pas très propre, le code appelant ferait mieux de se mettre à jour)
                                $this->reponse_entetes = array('wrapper_data' => explode("\r\n", $dernier_entete));
                        }
                        $this->traiterEntete();
                }
                $this->reinitialiser();
                return $contenu;
        }

        private function traiterUrlParametres() {
                $parametres = array();
                if (count($this->parametres) > 0) {
                        foreach ($this->parametres as $cle => $valeur) {
                                $cle = rawurlencode($cle);
                                $valeur = rawurlencode($valeur);
                                $parametres[] = $cle.self::HTTP_URL_REQUETE_CLE_VALEUR_SEPARATEUR.$valeur;
                        }
                        $url_parametres = implode(self::HTTP_URL_REQUETE_SEPARATEUR, $parametres);
                        $this->url = $this->url.'?'.$url_parametres;
                }
        }

        private function traiterEntete() {
                $infos = $this->analyserEntete();
                $this->traiterEnteteDebogage($infos);
        }

        private function analyserEntete() {
                $entetes = $this->reponse_entetes;
                $infos = array('date' => null, 'uri' => $this->url, 'debogages' => null);

                if (isset($entetes['wrapper_data'])) {
                        $entetes = $entetes['wrapper_data'];
                }
                foreach ($entetes as $entete) {
                        if (preg_match('/^X_REST_DEBOGAGE_MESSAGES: (.+)$/', $entete, $match)) {
                                $infos['debogages'] = json_decode($match[1]);
                        }
                        if (preg_match('/^Date: .+ ([012][0-9]:[012345][0-9]:[012345][0-9]) .*$/', $entete, $match)) {
                                $infos['date'] = $match[1];
                        }
                }
                return $infos;
        }

        private function traiterEnteteDebogage($entetes) {
                if (isset($entetes['debogages'])) {
                        $date = $entetes['date'];
                        $uri = $entetes['uri'];
                        $debogages = $entetes['debogages'];
                        foreach ($debogages as $debogage) {
                                $e = "DEBOGAGE : $date - $uri :\n$debogage";
                                trigger_error($e, E_USER_NOTICE);
                        }
                }
        }

        private function reinitialiser() {
                $this->nettoyerParametres();
        }
}