instantcommons.php
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instantcommons.php
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	<?php

	/**
	* Keruald, core libraries for Pluton and Xen engines.
	* (c) 2010-2013, Sébastien Santoro aka Dereckson, some rights reserved
	* Released under BSD license
	*
	* @package Pluton
	* @subpackage Pluton
	* @copyright Copyright (c) 2010-2013, Sébastien Santoro aka Dereckson
	* @license Released under BSD license
	* @version 0.1
	*
	* @todo Add protection against DoS for cache mode: we can't easily fill an hard disk with this one.
	* @todo Consider to check local existence. Currently, it depends of a nginx rule (@try_files $uri /includes/instantcommons.php).
	*/

	/**
	* A Wikimedia Commons media
	*/
	class InstantCommonsMedia {
	public $filename;
	public $remoteFilename;

	private $dataInfo;

	public $urlInfo;
	public $urlFile;
	public $width = 0;

	public function __construct ($filename) {
	$this->filename = self::clean_filename($filename);
	$this->get_url_info();
	$this->get_url_file();
	}

	public static function clean_filename ($filename) {
	$filename = urldecode($filename);
	$filename = str_replace(' ', '_', $filename);
	return $filename;
	}

	public static function get_context () {
	return stream_context_create([
	'http' => [
	'method' => 'GET',
	'header' => "User-Agent: InstantCommons/0.1 (Keruald/Pluton)",
	]
	]);

	}

	private function get_data_info () {
	if (!$this->urlInfo) {
	$this->urlInfo = $this->get_url_info();
	}
	$this->dataInfo = file_get_contents($this->urlInfo, false, self::get_context());
	}

	private function get_url_info () {
	// Determines URL according the thumbnail or original format request
	$data = array();
	if (preg_match("@(.+)\.svg\-([0-9]+)px\.png$@", $this->filename, $data)) {
	//.svg-200px.png
	$this->remoteFilename = $data[1] . '.svg';
	$this->width = $data[2];
	} elseif (preg_match("@(.+)-([0-9]+)px(\.[a-zA-Z0-9]+)$@", $this->filename, $data)) {
	//-200px.<ext>
	$this->remoteFilename = $data[1] . $data[3];
	$this->width = $data[2];
	} else {
	//Original size
	$this->remoteFilename = $this->filename;
	}

	$this->urlInfo = "http://commons.wikimedia.org/wiki/File:" . urlencode($this->remoteFilename);
	}

	/**
	* Queues download operation
	*/
	public function queue_download () {
	}

	/**
	* Gets the URL of the file
	*
	* @string The URL of the file, ready to download or hotlink.
	*/
	public function get_url_file () {
	//Original media
	if (!$this->dataInfo) $this->get_data_info();
	if (!$this->dataInfo) die("Can't get data info.");
	$this->urlFile = 'http:' . string_between($this->dataInfo, '<div class="fullMedia"><a href="', '"');

	//Thumbnail
	if ($this->width > 0) {
	//Original: http://upload.wikimedia.org/wikipedia/commons/7/75/Wikimedia_Community_Logo.svg
	//Thumbnail: http://upload.wikimedia.org/wikipedia/commons/thumb/7/75/Wikimedia_Community_Logo.svg/200px-Wikimedia_Community_Logo.svg.png
	$this->urlFile = str_replace('/wikipedia/commons/', '/wikipedia/commons/thumb/', $this->urlFile);
	$this->urlFile .= "/{$this->width}px-{$this->remoteFilename}";
	if (substr($this->urlFile, -4) == ".svg") { $this->urlFile .= '.png'; }
	}
	}

	/**
	* Serves media file
	*
	* @todo Handle 404
	*/
	public function serve () {
	switch ($extension = strtolower(get_extension($this->filename))) {
	case "png":
	header('Content-type: image/png');
	break;

	case "gif":
	header('Content-type: image/gif');
	break;

	case "jpg":
	case "jpeg":
	header('Content-type: image/jpeg');
	break;

	case "svg":
	header('Content-type: image/svg+xml');
	break;

	default:
	die("Unknown file extension: $extension");
	}
	header("Content-Disposition: filename=$media->filename");
	header("Content-Transfer-Encoding: binary");

	//Reads and flushes file
	$out = ob_get_clean();
	ob_clean();
	flush();
	readfile($this->urlFile);
	exit;
	}

	public function dump ($includeDataInfo = false, $die = true) {
	if (!$includeDataInfo) { $this->dataInfo = ""; }
	dprint_r($this);
	if ($die) exit;
	}
	}

	// Loads Keruald library
	if (!defined('IN_KERUALD')) {
	require('core.php');
	}

	// Gets media information
	$url = get_current_url_fragments();
	$media = new InstantCommonsMedia(array_pop($url));

	// Serves media
	//$media->dump();
	$media->queue_download();
	$media->serve();

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