388 lines
12 KiB
PHP
388 lines
12 KiB
PHP
<?php
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/**
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* All bridge logic
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* Note : adapter are store in other place
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*/
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interface BridgeInterface{
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public function collectData(array $param);
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public function getCacheDuration();
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public function loadMetadatas();
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public function getName();
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public function getURI();
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}
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abstract class BridgeAbstract implements BridgeInterface{
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protected $cache;
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protected $items = array();
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public $name = "Unnamed bridge";
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public $uri = "";
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public $description = 'No description provided';
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public $maintainer = 'No maintainer';
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public $useProxy = false;
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public $parameters = array();
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/**
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* Launch probative exception
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*/
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protected function returnError($message, $code){
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throw new \HttpException($message, $code);
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}
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protected function returnClientError($message){
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$this->returnError($message, 400);
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}
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protected function returnServerError($message){
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$this->returnError($message, 500);
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}
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/**
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* Return datas stored in the bridge
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* @return mixed
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*/
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public function getDatas(){
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return $this->items;
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}
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/**
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* Defined datas with parameters depending choose bridge
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* Note : you can define a cache before with "setCache"
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* @param array $param $_REQUEST, $_GET, $_POST, or array with bridge expected paramters
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*/
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public function setDatas(array $param){
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if( !is_null($this->cache) ){
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$this->cache->prepare($param);
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$time = $this->cache->getTime();
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}
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else{
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$time = false; // No cache ? No time !
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}
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if( $time !== false && ( time() - $this->getCacheDuration() < $time ) ){ // Cache file has not expired. Serve it.
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$this->items = $this->cache->loadData();
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}
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else{
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$this->collectData($param);
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if( !is_null($this->cache) ){ // Cache defined ? We go to refresh is memory :D
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$this->cache->saveData($this->getDatas());
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}
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}
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}
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/**
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* Define default bridge name
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*/
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public function getName(){
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return $this->name;
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}
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/**
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* Define default bridge URI
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*/
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public function getURI(){
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return $this->uri;
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}
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/**
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* Define default duraction for cache
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*/
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public function getCacheDuration(){
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return 3600;
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}
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/**
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* Defined cache object to use
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*/
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public function setCache(\CacheAbstract $cache){
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$this->cache = $cache;
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return $this;
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}
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protected function file_get_html($url, $use_include_path = false, $context=null, $offset = -1, $maxLen=-1, $lowercase = true, $forceTagsClosed=true, $target_charset = DEFAULT_TARGET_CHARSET, $stripRN=true, $defaultBRText=DEFAULT_BR_TEXT, $defaultSpanText=DEFAULT_SPAN_TEXT){
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$contextOptions = array(
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'http' => array(
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'user_agent'=>ini_get('user_agent')
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),
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);
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if(defined('PROXY_URL') && $this->useProxy) {
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$contextOptions['http']['proxy'] = PROXY_URL;
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$contextOptions['http']['request_fulluri'] = true;
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if(is_null($context)){
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$context = stream_context_create($contextOptions);
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} else {
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$prevContext=$context;
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if(!stream_context_set_option($context,$contextOptions)){
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$context=$prevContext;
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};
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}
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}
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return file_get_html($url,$use_include_path,$context,$offset,$maxLen,
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$lowercase,$forceTagsClosed,$target_charset,$stripRN,$defaultBRText,
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$defaultSpanText);
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}
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}
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/**
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* Extension of BridgeAbstract allowing caching of files downloaded over http files.
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* This is specially useful for sites from Gawker or Liberation networks, which allow pages excerpts top be viewed together on index, while full pages have to be downloaded
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* separately.
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* This class mainly provides a get_cached method which will will download the file from its remote location.
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* TODO allow file cache invalidation by touching files on access, and removing files/directories which have not been touched since ... a long time
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* After all, rss-bridge is not respaw, isn't it ?
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*/
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abstract class HttpCachingBridgeAbstract extends BridgeAbstract {
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/**
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* Maintain locally cached versions of pages to download to avoid multiple doiwnloads.
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* A file name is generated by replacing all "/" by "_", and the file is saved below this bridge cache
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* @param url url to cache
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* @return content of file as string
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*/
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public function get_cached($url) {
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$simplified_url = str_replace(["http://", "https://", "?", "&", "="], ["", "", "/", "/", "/"], $url);
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// TODO build this from the variable given to Cache
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$pageCacheDir = __DIR__ . '/../cache/'."pages/";
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$filename = $pageCacheDir.$simplified_url;
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if (substr($filename, -1) == '/') {
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$filename = $filename."index.html";
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}
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if(file_exists($filename)) {
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// $this->message("loading cached file from ".$filename." for page at url ".$url);
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// TODO touch file and its parent, and try to do neighbour deletion
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$this->refresh_in_cache($pageCacheDir, $filename);
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} else {
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// $this->message("we have no local copy of ".$url." Downloading to ".$filename);
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$dir = substr($filename, 0, strrpos($filename, '/'));
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if(!is_dir($dir)) {
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// $this->message("creating directories for ".$dir);
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mkdir($dir, 0777, true);
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}
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$this->download_remote($url, $filename);
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}
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return file_get_contents($filename);
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}
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public function get_cached_time($url) {
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$simplified_url = str_replace(["http://", "https://", "?", "&", "="], ["", "", "/", "/", "/"], $url);
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// TODO build this from the variable given to Cache
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$pageCacheDir = __DIR__ . '/../cache/'."pages/";
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$filename = $pageCacheDir.$simplified_url;
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if (substr($filename, -1) == '/') {
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$filename = $filename."index.html";
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}
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if(!file_exists($filename)) {
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$this->get_cached($url);
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}
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return filectime($filename);
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}
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private function refresh_in_cache($pageCacheDir, $filename) {
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$currentPath = $filename;
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while(!$pageCacheDir==$currentPath) {
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touch($currentPath);
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$currentPath = dirname($currentPath);
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}
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}
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public function download_remote($url , $save_path) {
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$f = fopen( $save_path , 'w+');
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if($f) {
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$handle = fopen($url , "rb");
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if($handle) {
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while (!feof($handle)) {
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$contents = fread($handle, 8192);
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if($contents) {
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fwrite($f , $contents);
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}
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}
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fclose($handle);
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}
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fclose($f);
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}
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}
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public function remove_from_cache($url) {
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$simplified_url = str_replace(["http://", "https://", "?", "&", "="], ["", "", "/", "/", "/"], $url);
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// TODO build this from the variable given to Cache
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$pageCacheDir = __DIR__ . '/../cache/'."pages/";
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$filename = realpath($pageCacheDir.$simplified_url);
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$this->message("removing from cache \"".$filename."\" WELL, NOT REALLY");
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// filename is NO GOOD
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// unlink($filename);
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}
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public function message($text) {
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$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
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$calling = $backtrace[2];
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$message = $calling["file"].":".$calling["line"]
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." class ".get_class($this)."->".$calling["function"]
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." - ".$text;
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error_log($message);
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}
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}
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class Bridge{
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static protected $dirBridge;
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public function __construct(){
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throw new \LogicException('Please use ' . __CLASS__ . '::create for new object.');
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}
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/**
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* Checks if a bridge is an instantiable bridge.
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* @param string $nameBridge name of the bridge that you want to use
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* @return true if it is an instantiable bridge, false otherwise.
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*/
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static public function isInstantiable($nameBridge) {
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$re = new ReflectionClass($nameBridge);
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return $re->IsInstantiable();
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}
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/**
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* Create a new bridge object
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* @param string $nameBridge Defined bridge name you want use
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* @return Bridge object dedicated
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*/
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static public function create($nameBridge){
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if( !static::isValidNameBridge($nameBridge) ){
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throw new \InvalidArgumentException('Name bridge must be at least one uppercase follow or not by alphanumeric or dash characters.');
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}
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$pathBridge = self::getDir() . $nameBridge . '.php';
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if( !file_exists($pathBridge) ){
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throw new \Exception('The bridge you looking for does not exist. It should be at path '.$pathBridge);
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}
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require_once $pathBridge;
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if(Bridge::isInstantiable($nameBridge)) {
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return new $nameBridge();
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} else {
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return FALSE;
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}
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}
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static public function setDir($dirBridge){
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if( !is_string($dirBridge) ){
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throw new \InvalidArgumentException('Dir bridge must be a string.');
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}
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if( !file_exists($dirBridge) ){
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throw new \Exception('Dir bridge does not exist.');
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}
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self::$dirBridge = $dirBridge;
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}
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static public function getDir(){
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$dirBridge = self::$dirBridge;
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if( is_null($dirBridge) ){
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throw new \LogicException(__CLASS__ . ' class need to know bridge path !');
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}
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return $dirBridge;
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}
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static public function isValidNameBridge($nameBridge){
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return preg_match('@^[A-Z][a-zA-Z0-9-]*$@', $nameBridge);
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}
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/**
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* Lists the available bridges.
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* @return array List of the bridges
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*/
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static public function listBridges() {
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$pathDirBridge = self::getDir();
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$listBridge = array();
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$dirFiles = scandir($pathDirBridge);
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if( $dirFiles !== false ){
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foreach( $dirFiles as $fileName ) {
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if( preg_match('@([^.]+)\.php$@U', $fileName, $out) ){
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$listBridge[] = $out[1];
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}
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}
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}
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return $listBridge;
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}
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static function isWhitelisted( $whitelist, $name ) {
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if(in_array("$name", $whitelist) or in_array("$name.php", $whitelist) or count($whitelist) === 1 and trim($whitelist[0]) === '*')
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return TRUE;
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else
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return FALSE;
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}
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}
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abstract class RssExpander extends HttpCachingBridgeAbstract{
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public $name;
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public $uri;
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public $description;
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public function collectExpandableDatas(array $param, $name){
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if (empty($name)) {
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$this->returnServerError('There is no $name for this RSS expander');
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}
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// $this->message("Loading from ".$param['url']);
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// Notice WE DO NOT use cache here on purpose : we want a fresh view of the RSS stream each time
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$rssContent = simplexml_load_file($name) or $this->returnServerError('Could not request '.$name);
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// $this->message("loaded RSS from ".$param['url']);
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// TODO insert RSS format detection
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// we suppose for now, we have some RSS 2.0
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$this->collect_RSS_2_0_data($rssContent);
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}
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protected function collect_RSS_2_0_data($rssContent) {
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$rssContent = $rssContent->channel[0];
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// $this->message("RSS content is ===========\n".var_export($rssContent, true)."===========");
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$this->load_RSS_2_0_feed_data($rssContent);
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foreach($rssContent->item as $item) {
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// $this->message("parsing item ".var_export($item, true));
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$this->items[] = $this->parseRSSItem($item);
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}
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}
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protected function RSS_2_0_time_to_timestamp($item) {
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return DateTime::createFromFormat('D, d M Y H:i:s e', $item->pubDate)->getTimestamp();
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}
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// TODO set title, link, description, language, and so on
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protected function load_RSS_2_0_feed_data($rssContent) {
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$this->name = trim($rssContent->title);
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$this->uri = trim($rssContent->link);
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$this->description = trim($rssContent->description);
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}
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/**
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* Method should return, from a source RSS item given by lastRSS, one of our Items objects
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* @param $item the input rss item
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* @return a RSS-Bridge Item, with (hopefully) the whole content)
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*/
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abstract protected function parseRSSItem($item);
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public function getDescription() {
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return $this->description;
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}
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}
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