221 lines
9 KiB
PHP
221 lines
9 KiB
PHP
<?php
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/* rss-bridge library.
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Foundation functions for rss-bridge project.
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See https://github.com/sebsauvage/rss-bridge
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Licence: Public domain.
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*/
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ini_set('user_agent', 'Mozilla/5.0 (X11; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0');
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date_default_timezone_set('UTC');
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error_reporting(0);
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ini_set('display_errors','1'); error_reporting(E_ALL); // For debugging only.
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define('CACHEDIR','cache/'); // Directory containing cache files. Do not forget trailing slash.
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define('CHARSET', 'UTF-8');
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define('SimpleDomLib', 'vendor/simplehtmldom/simple_html_dom.php');
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ob_start();
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// Create cache directory if it does not exist.
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if (!is_dir(CACHEDIR)) { mkdir(CACHEDIR,0705); chmod(CACHEDIR,0705); }
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// Import DOM library.
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if (!file_exists(SimpleDomLib))
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{
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header('HTTP/1.1 500 Internal Server Error');
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header('Content-Type: text/plain');
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die('"PHP Simple HTML DOM Parser" is missing. Get it from http://simplehtmldom.sourceforge.net and place the script "simple_html_dom.php" in the same folder to allow me to work.');
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}
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require_once(SimpleDomLib);
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/**
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* Abstract RSSBridge class on which all bridges are build upon.
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* It provides utility methods (cache, ATOM feed building...)
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*/
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abstract class RssBridgeAbstractClass {
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/**
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* $items is an array of dictionnaries. Each subclass must fill this array when collectData() is called.
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* eg. $items = array( array('uri'=>'http://foo.bar', 'title'=>'My beautiful foobar', 'content'='Hello, <b>world !</b>','timestamp'=>'1375864834'),
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* array('uri'=>'http://toto.com', 'title'=>'Welcome to toto', 'content'='What is this website about ?','timestamp'=>'1375868313')
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* )
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* Keys in dictionnaries:
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* uri (string;mandatory) = The URI the item points to.
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* title (string;mandatory) = Title of item
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* content (string;optionnal) = item content (usually HTML code)
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* timestamp (string;optionnal) = item date. Must be in EPOCH format.
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* Other keys can be added, but will be ignored.
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* $items will be used to build the ATOM feed, json and other outputs.
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*/
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public $items;
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private $contentType; // MIME type returned to browser.
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/**
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* Sets the content-type returns to browser.
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*
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* @param string Content-type returns to browser - Example: $this->setContentType('text/html; charset=UTF-8')
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* @return this
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*/
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private function setContentType($value){
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$this->contentType = $value;
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header('Content-Type: '.$value);
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return $this;
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}
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/**
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* collectData() will be called to ask the bridge to go collect data on the net.
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* All derived classes must implement this method.
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* This method must fill $this->items with collected items.
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* @param mixed $request : The incoming request (=$_GET). This can be used or ignored by the bridge.
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*/
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abstract protected function collectData($request);
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/**
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* Returns a HTTP error to user, with a message.
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* Example: $this->returnError(404, 'no results.');
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* @param integer $code
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* @param string $message
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*/
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protected function returnError($code, $message){
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$errors = array(
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400 => 'Bad Request',
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404 => 'Not Found',
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501 => 'Not Implemented',
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);
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header('HTTP/1.1 ' . $code . ( isset($errors[$code]) ? ' ' . $errors[$code] : ''));
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header('Content-Type: text/plain;charset=' . CHARSET);
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die('ERROR : ' . $message);
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}
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/**
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* Builds an ATOM feed from $this->items and return it to browser.
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*/
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private function returnATOM(){
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$this->setContentType('application/atom+xml; charset=' . CHARSET);
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$https = ( isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 's' : '' );
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$httpHost = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
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$httpInfo = isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '';
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echo '<?xml version="1.0" encoding="UTF-8"?><feed xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xml:lang="en-US">'."\n";
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echo '<title type="text">'.htmlspecialchars($this->bridgeName).'</title>'."\n";
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echo '<id>http' . $https . '://' . $httpHost . $httpInfo . './</id>'."\n";
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echo '<updated></updated>'."\n"; // FIXME
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echo '<link rel="alternate" type="text/html" href="'.htmlspecialchars($this->bridgeURI).'" />'."\n";
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echo '<link rel="self" href="http'.$https.'://' . $httpHost . htmlentities($_SERVER['REQUEST_URI']).'" />'."\n"."\n";
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foreach($this->items as $item) {
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echo '<entry><author><name>'.htmlspecialchars($this->bridgeName).'</name><uri>'.htmlspecialchars($this->bridgeURI).'</uri></author>'."\n";
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echo '<title type="html"><![CDATA['.$item['title'].']]></title>'."\n";
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echo '<link rel="alternate" type="text/html" href="'.$item['uri'].'" />'."\n";
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echo '<id>'.$item['uri'].'</id>'."\n";
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echo '<updated>' . ( isset($item['timestamp']) ? date(DATE_ATOM, $item['timestamp']) : '' ) . '</updated>'."\n";
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echo '<content type="html">' . ( isset($item['content']) ? '<![CDATA[' . $item['content'] . ']]>' : '') . '</content>'."\n";
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// FIXME: Security: Disable Javascript ?
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echo '</entry>'."\n\n";
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}
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echo '</feed>';
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}
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private function returnHTML(){
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$this->setContentType('text/html; charset=' . CHARSET);
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echo '<html><head><title>'.htmlspecialchars($this->bridgeName).'</title>';
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echo '<style>body{font-family:"Trebuchet MS",Verdana,Arial,Helvetica,sans-serif;font-size:10pt;background-color:#aaa;}div.rssitem{border:1px solid black;padding:5px;margin:10px;background-color:#fff;}</style></head><body>';
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echo '<h1>'.htmlspecialchars($this->bridgeName).'</h1>';
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foreach($this->items as $item) {
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echo '<div class="rssitem"><h2><a href="'.$item['uri'].'">'.htmlspecialchars(strip_tags($item['title'])).'</a></h2>';
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if (isset($item['timestamp'])) { echo '<small>'.date(DATE_ATOM, $item['timestamp']).'</small>'; }
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if (isset($item['content'])) { echo '<p>'.$item['content'].'</p>'; }
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echo "</div>\n\n";
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}
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echo '</body></html>';
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}
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/**
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* Builds a JSON string from $this->items and return it to browser.
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*/
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private function returnJSON(){
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$this->setContentType('application/json');
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echo json_encode($this->items);
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}
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/**
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* Returns $this->items as raw php data.
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*/
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private function returnPlaintext(){
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$this->setContentType('text/plain;charset=' . CHARSET);
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print_r($this->items);
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}
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/**
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* Start processing request and return response to browser.
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*/
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public function process(){
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$this->serveCachedVersion();
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// Cache file does not exists or has expired: We re-fetch the results and cache it.
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$this->collectData($_REQUEST);
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if (empty($this->items)) { $this->returnError(404, 'no results.'); }
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$format = isset($_REQUEST['format']) ? $_REQUEST['format'] : 'atom';
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switch($format) {
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case 'plaintext':
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$this->returnPlaintext();
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break;
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case 'json':
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$this->returnJSON();
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break;
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case 'html':
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$this->returnHTML();
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break;
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default:
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$this->returnATOM();
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}
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$this->storeReponseInCache();
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}
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private function getCacheName(){
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if( !isset($_REQUEST) ){
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$this->returnError(501, 'WTF ?');
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}
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$stringToEncode = $_SERVER['REQUEST_URI'] . http_build_query($_REQUEST);
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return CACHEDIR.hash('sha1',$stringToEncode).'.cache';
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}
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/**
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* Returns the cached version of current request URI directly to the browser
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* if it exists and if cache has not expired.
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* Continues execution no cached version available.
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*/
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private function serveCachedVersion(){
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// See if cache exists for this request
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$cachefile = $this->getCacheName(); // Cache path and filename
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if (file_exists($cachefile)) { // The cache file exists.
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if (time() - ($this->cacheDuration*60) < filemtime($cachefile)) { // Cache file has not expired. Serve it.
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$data = json_decode(file_get_contents($cachefile),true);
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header('Content-Type: '.$data['Content-Type']); // Send proper MIME Type
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header('X-Cached-Version: '.date(DATE_ATOM, filemtime($cachefile)));
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echo $data['data'];
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exit();
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}
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}
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}
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/**
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* Stores currently generated page in cache.
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* @return this
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*/
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private function storeReponseInCache(){
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$cachefile = $this->getCacheName(); // Cache path and filename
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$data = array('data'=>ob_get_contents(), 'Content-Type'=>$this->contentType);
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file_put_contents($cachefile,json_encode($data));
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ob_end_flush();
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return $this;
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}
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} |