Subversion Repositories eFlore/Applications.del

<?php

// declare(encoding='UTF-8');

/**

 * Classe principale de chargement des sous-services de syndication.

 *

 * @category   DEL

 * @package    Services

 * @subpackage Syndication

 * @version    0.1

 * @author     Mathias CHOUET <mathias@tela-botanica.org>

 * @author     Jean-Pascal MILCENT <jpm@tela-botanica.org>

 * @author     Aurelien PERONNET <aurelien@tela-botanica.org>

 * @license    GPL v3 <http://www.gnu.org/licenses/gpl.txt>

 * @license    CECILL v2 <http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt>

 * @copyright  1999-2014 Tela Botanica <accueil@tela-botanica.org>

*/

class Syndication extends RestService {

	private $parametres = array();

	private $ressources = array();

	private $conteneur;

	private $methode = null;

	private $sousServiceNom = null;

	private $cheminCourant = null;

	private $serviceNom = 'syndication';

	private $format = 'atom';

	private $squelette_dossier = null;

	/** Indique si oui (true) ou non (false), on veut utiliser les paramètres bruts. */

	protected $utilisationParametresBruts = true;

	public function __construct() {

		$this->conteneur = new Conteneur();

		$this->cheminCourant = dirname(__FILE__).DS;

		$this->squelette_dossier = dirname(__FILE__).DS.$this->serviceNom.DS.'squelettes'.DS;

		$this->formats_autorises = $this->conteneur->getParametreTableau('syndication.formats');

	}

	public function consulter($ressources, $parametres) {

		$this->methode = 'consulter';

		$this->initialiserRessourcesEtParametres($ressources, $parametres);

		$this->verifierRessourcesEtParametres();

		$this->format = isset($this->parametres['format']) ? $this->parametres['format'] : $this->format;

		return $this->executerService();

	}

	private function initialiserRessourcesEtParametres($ressources, $parametres = array()) {

		$this->ressources = $ressources;

		$this->parametres = $parametres;

	}

	private function verifierRessourcesEtParametres() {

		if (isset($this->parametres['format']) && !in_array($this->parametres['format'], $this->formats_autorises)) {

			$msg = "Vous devez indiquer un format de flux valide.\n".$this->getDoc();

			throw new Exception($msg, RestServeur::HTTP_CODE_ERREUR);

		}

	}

	private function executerService() {

		$reponseHttp = new ReponseHttp();

		try {

			$donnees = $this->traiterRessources();

			$resultat = $this->creerResultatService($donnees);

			$reponseHttp->setResultatService($resultat);

		} catch (Exception $e) {

			$reponseHttp->ajouterErreur($e);

		}

		$reponseHttp->emettreLesEntetes();

		$corps = $reponseHttp->getCorps();

		return $corps;

	}

	private function traiterRessources() {

		$this->analyserRessources();

		$retour = $this->initialiserService();

		return $retour;

	}

	private function analyserRessources() {

		if ($this->methode == 'consulter' && isset($this->ressources[0])) {

			if (preg_match('/^tags|votes-?-Par-?Tag|tags-?Par-?Protocole$/i', $this->ressources[0])) {

				$this->sousServiceNom = 'tags';

			} else if (preg_match('/^votes|votes-?Par-?Protocole$/i', $this->ressources[0])){

				$this->sousServiceNom = 'votes';

			} else if ($this->ressources[0] == 'commentaires') {

				$this->sousServiceNom = 'commentaires';

			}

		}

		if ($this->sousServiceNom == null) {

			$this->lancerMessageErreurRessource();

		}

	}

	private function lancerMessageErreurRessource() {

		$ressource = $this->sousServiceNom.'/'.implode('/', $this->ressources);

		$message = "La ressource demandée '$ressource' ".

			"n'est pas disponible pour le service {$this->serviceNom} !\n".

			$this->getDoc();

		$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;

		throw new Exception($message, $code);

	}

	public function getDoc() {

		$formatsAutorises = implode(', ', $this->formats_autorises);

		return "Les URLs disponibles pour ce service sont :\n".

			" * en GET :\n".

			" - syndication/commentaires\n".

			" - syndication/tags\n".

			" - syndication/votes-par-protocole\n".

			" Paramètres : \n".

			"  - format : $formatsAutorises";

	}

	private function initialiserService() {

		$classe = $this->obtenirNomClasseService();

		$chemins = array();

		$chemins[] = $this->cheminCourant.$this->serviceNom.DS.$classe.'.php';

		$chemins[] = $this->cheminCourant.'commun'.DS.$classe.'.php';

		$retour = '';

		$service = null;

		foreach ($chemins as $chemin) {

			if (file_exists($chemin)) {

				require_once $chemin;

				$service = new $classe($this->conteneur);

				if ($this->methode == 'consulter') {

					$retour = $service->consulter();

				} else {

					$message = "Le sous-service '{$this->sousServiceNom}' du service '{$this->serviceNom}' ".

						"ne possède pas de méthode '{$this->methode}' !";

					$code = RestServeur::HTTP_NON_IMPLEMENTE;

					throw new Exception($message, $code);

				}

			}

		}

		if (is_null($service)) {

			$ressource = $this->serviceNom.'/'.implode('/', $this->ressources);

			$message = "Le classe '$classe' correspondant à la ressource '$ressource' ".

				"est introuvable par le service '{$this->serviceNom}' !\n".

				$this->getDoc();

			$code = RestServeur::HTTP_CODE_RESSOURCE_INTROUVABLE;

			throw new Exception($message, $code);

		}

		return $retour;

	}

	private function obtenirNomClasseService() {

		return str_replace(' ', '', ucwords(strtolower(str_replace('-', ' ', $this->sousServiceNom))));

	}

	private function creerResultatService($donnees) {

		$resultat = new ResultatService();

		$resultat->mime = $this->getTypeMime();

		$resultat->corps = SquelettePhp::analyser($this->squelette_dossier.$this->format.'.tpl.xml', $donnees);

		return $resultat;

	}

	private function getTypeMime() {

		$mime = '';

		switch ($this->format) {

			case 'atom' :

				$mime = 'application/atom+xml';

				break;

			case 'rss1' :

			case 'rss2' :

				$mime = 'application/rss+xml';

				break;

			case 'opml' :

				$mime = 'text/x-opml';

				break;

			default:

				$mime = 'text/html';

		}

		return $mime;

	}

}