401 lines
12 KiB
PHP
401 lines
12 KiB
PHP
<?php
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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(!preg_match('@^[A-Z][a-zA-Z0-9-]*$@', $nameBridge)){
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$message = <<<EOD
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'nameBridge' must start with one uppercase character followed or not by
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alphanumeric or dash characters!
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EOD;
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throw new \InvalidArgumentException($message);
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}
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$nameBridge = $nameBridge . 'Bridge';
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$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 $dirBridge;
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}
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/**
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* Lists the available bridges.
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* @return array List of the bridges
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*/
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static public function listBridges(){
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$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 $fileName){
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if(preg_match('@^([^.]+)Bridge\.php$@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 $listBridge;
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}
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static public function isWhitelisted($whitelist, $name){
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if(in_array($name, $whitelist)
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or in_array($name . '.php', $whitelist)
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or in_array($name . 'Bridge', $whitelist) // DEPRECATED
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or in_array($name . 'Bridge.php', $whitelist) // DEPRECATED
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or count($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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}
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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 = true;
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public $parameters = array();
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protected function returnError($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 items 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 with "setCache"
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* @param array $param $_REQUEST, $_GET, $_POST, or array with expected
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* bridge 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 = $this->cache->getTime();
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} else {
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$time = false;
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}
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if($time !== false && (time() - $this->getCacheDuration() < $time)){
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$this->items = $this->cache->loadData();
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} else {
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$this->collectData($param);
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if(!is_null($this->cache)){
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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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public function getName(){
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return $this->name;
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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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public function getCacheDuration(){
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return 3600;
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}
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public function setCache(\CacheAbstract $cache){
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$this->cache = $cache;
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}
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public function debugMessage($text){
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if(!file_exists('DEBUG')) {
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return;
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}
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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'] . ':'
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. $calling['line'] . ' class '
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. get_class($this) . '->'
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. $calling['function'] . ' - '
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. $text;
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error_log($message);
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}
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protected function getContents($url
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, $use_include_path = false
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, $context = null
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, $offset = 0
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, $maxlen = null){
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$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 = $prevContext;
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}
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}
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}
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if(is_null($maxlen)){
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$content = @file_get_contents($url, $use_include_path, $context, $offset);
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} else {
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$content = @file_get_contents($url, $use_include_path, $context, $offset, $maxlen);
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}
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if($content === false)
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$this->debugMessage('Cant\'t download ' . $url);
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return $content;
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}
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protected function getSimpleHTMLDOM($url
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, $use_include_path = false
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, $context = null
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, $offset = 0
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, $maxLen = null
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, $lowercase = true
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, $forceTagsClosed = true
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, $target_charset = DEFAULT_TARGET_CHARSET
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, $stripRN = true
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, $defaultBRText = DEFAULT_BR_TEXT
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, $defaultSpanText = DEFAULT_SPAN_TEXT){
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$content = $this->getContents($url, $use_include_path, $context, $offset, $maxLen);
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return str_get_html($content
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, $lowercase
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, $forceTagsClosed
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, $target_charset
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, $stripRN
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, $defaultBRText
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, $defaultSpanText);
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}
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}
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/**
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* Extension of BridgeAbstract allowing caching of files downloaded over http.
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* TODO allow file cache invalidation by touching files on access, and removing
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* files/directories which have not been touched since ... a long time
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*/
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abstract class HttpCachingBridgeAbstract extends BridgeAbstract {
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/**
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* Maintain locally cached versions of pages to download, to avoid multiple downloads.
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* @param url url to cache
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* @return content of the file as string
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*/
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public function get_cached($url){
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// TODO build this from the variable given to Cache
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$cacheDir = __DIR__ . '/../cache/pages/';
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$filepath = $this->buildCacheFilePath($url, $cacheDir);
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if(file_exists($filepath)){
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$this->debugMessage('loading cached file from ' . $filepath . ' 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($cacheDir, $filepath);
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$content = file_get_contents($filepath);
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} else {
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$this->debugMessage('we have no local copy of ' . $url . ' Downloading to ' . $filepath);
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$dir = substr($filepath, 0, strrpos($filepath, '/'));
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if(!is_dir($dir)){
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$this->debugMessage('creating directories for ' . $dir);
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mkdir($dir, 0777, true);
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}
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$content = $this->getContents($url);
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if($content !== false){
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file_put_contents($filepath, $content);
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}
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}
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return $content;
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}
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public function get_cached_time($url){
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// TODO build this from the variable given to Cache
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$cacheDir = __DIR__ . '/../cache/pages/';
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$filepath = $this->buildCacheFilePath($url, $cacheDir);
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if(!file_exists($filepath)){
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$this->get_cached($url);
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}
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return filectime($filepath);
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}
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private function refresh_in_cache($cacheDir, $filepath){
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$currentPath = $filepath;
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while(!$cacheDir == $currentPath){
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touch($currentPath);
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$currentPath = dirname($currentPath);
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}
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}
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private function buildCacheFilePath($url, $cacheDir){
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$simplified_url = str_replace(
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['http://', 'https://', '?', '&', '='],
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['', '', '/', '/', '/'],
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$url);
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if(substr($cacheDir, -1) !== '/'){
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$cacheDir .= '/';
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}
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$filepath = $cacheDir . $simplified_url;
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if(substr($filepath, -1) === '/'){
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$filepath .= 'index.html';
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}
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return $filepath;
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}
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public function remove_from_cache($url){
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// TODO build this from the variable given to Cache
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$cacheDir = __DIR__ . '/../cache/pages/';
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$filepath = $this->buildCacheFilePath($url, $cacheDir);
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$this->debugMessage('removing from cache \'' . $filepath . '\' WELL, NOT REALLY');
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// unlink($filepath);
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}
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}
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abstract class RssExpander extends HttpCachingBridgeAbstract {
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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->debugMessage('Loading from ' . $param['url']);
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/* Notice we do not use cache here on purpose:
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* we want a fresh view of the RSS stream each time
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*/
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$content = $this->getContents($name) or $this->returnServerError('Could not request ' . $name);
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$rssContent = simplexml_load_string($content);
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$this->debugMessage('loaded RSS from ' . $param['url']);
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// TODO insert RSS format detection
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// For now we always assume RSS 2.0
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$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->debugMessage('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->debugMessage('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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