forked from blallo/rss-bridge
652 lines
20 KiB
PHP
652 lines
20 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();
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public function getCacheDuration();
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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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const NAME = 'Unnamed bridge';
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const URI = '';
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const DESCRIPTION = 'No description provided';
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const MAINTAINER = 'No maintainer';
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const PARAMETERS = array();
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public $useProxy = true;
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protected $cache;
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protected $items = array();
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protected $inputs = array();
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protected $queriedContext = '';
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protected function returnError($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 getItems(){
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return $this->items;
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}
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protected function validateTextValue($value, $pattern = null){
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if(!is_null($pattern)){
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$filteredValue = filter_var($value, FILTER_VALIDATE_REGEXP,
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array('options' => array(
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'regexp' => '/^' . $pattern . '$/'
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))
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);
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} else {
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$filteredValue = filter_var($value);
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}
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if($filteredValue === false)
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return null;
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return $filteredValue;
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}
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protected function validateNumberValue($value){
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$filteredValue = filter_var($value, FILTER_VALIDATE_INT);
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if($filteredValue === false && !empty($value))
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return null;
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return $filteredValue;
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}
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protected function validateCheckboxValue($value){
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$filteredValue = filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
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if(is_null($filteredValue))
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return null;
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return $filteredValue;
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}
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protected function validateListValue($value, $expectedValues){
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$filteredValue = filter_var($value);
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if($filteredValue === false)
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return null;
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if(!in_array($filteredValue, $expectedValues)){ // Check sub-values?
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foreach($expectedValues as $subName => $subValue){
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if(is_array($subValue) && in_array($filteredValue, $subValue))
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return $filteredValue;
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}
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return null;
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}
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return $filteredValue;
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}
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protected function validateData(&$data){
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if(!is_array($data))
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return false;
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foreach($data as $name=>$value){
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$registered = false;
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foreach(static::PARAMETERS as $context=>$set){
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if(array_key_exists($name,$set)){
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$registered = true;
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if(!isset($set[$name]['type'])){
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$set[$name]['type']='text';
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}
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switch($set[$name]['type']){
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case 'number':
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$data[$name] = $this->validateNumberValue($value);
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break;
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case 'checkbox':
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$data[$name] = $this->validateCheckboxValue($value);
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break;
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case 'list':
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$data[$name] = $this->validateListValue($value, $set[$name]['values']);
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break;
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default:
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case 'text':
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if(isset($set[$name]['pattern'])){
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$data[$name] = $this->validateTextValue($value, $set[$name]['pattern']);
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} else {
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$data[$name] = $this->validateTextValue($value);
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}
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break;
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}
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if(is_null($data[$name])){
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echo 'Parameter \'' . $name . '\' is invalid!' . PHP_EOL;
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return false;
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}
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}
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}
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if(!$registered)
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return false;
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}
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return true;
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}
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protected function setInputs(array $inputs, $queriedContext){
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// Import and assign all inputs to their context
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foreach($inputs as $name => $value){
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foreach(static::PARAMETERS as $context => $set){
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if(array_key_exists($name, static::PARAMETERS[$context])){
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$this->inputs[$context][$name]['value'] = $value;
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}
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}
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}
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// Apply default values to missing data
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$contexts = array($queriedContext);
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if(array_key_exists('global', static::PARAMETERS)){
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$contexts[] = 'global';
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}
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foreach($contexts as $context){
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foreach(static::PARAMETERS[$context] as $name => $properties){
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if(isset($this->inputs[$context][$name]['value'])){
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continue;
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}
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$type = isset($properties['type']) ? $properties['type'] : 'text';
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switch($type){
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case 'checkbox':
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if(!isset($properties['defaultValue'])){
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$this->inputs[$context][$name]['value'] = false;
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} else {
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$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
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}
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break;
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case 'list':
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if(!isset($properties['defaultValue'])){
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$firstItem = reset($properties['values']);
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if(is_array($firstItem)){
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$firstItem = reset($firstItem);
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}
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$this->inputs[$context][$name]['value'] = $firstItem;
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} else {
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$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
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}
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break;
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default:
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if(isset($properties['defaultValue'])){
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$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
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}
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break;
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}
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}
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}
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// Copy global parameter values to the guessed context
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if(array_key_exists('global', static::PARAMETERS)){
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foreach(static::PARAMETERS['global'] as $name => $properties){
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if(isset($inputs[$name])){
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$value = $inputs[$name];
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} elseif (isset($properties['value'])){
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$value = $properties['value'];
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} else {
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continue;
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}
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$this->inputs[$queriedContext][$name]['value'] = $value;
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}
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}
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// Only keep guessed context parameters values
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if(isset($this->inputs[$queriedContext])){
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$this->inputs = array($queriedContext => $this->inputs[$queriedContext]);
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} else {
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$this->inputs = array();
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}
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}
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protected function getQueriedContext(array $inputs){
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$queriedContexts=array();
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foreach(static::PARAMETERS as $context=>$set){
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$queriedContexts[$context]=null;
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foreach($set as $id=>$properties){
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if(isset($inputs[$id]) && !empty($inputs[$id])){
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$queriedContexts[$context]=true;
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}elseif(isset($properties['required']) &&
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$properties['required']===true){
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$queriedContexts[$context]=false;
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break;
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}
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}
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}
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if(array_key_exists('global',static::PARAMETERS) &&
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$queriedContexts['global']===false){
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return null;
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}
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unset($queriedContexts['global']);
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switch(array_sum($queriedContexts)){
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case 0:
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foreach($queriedContexts as $context=>$queried){
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if (is_null($queried)){
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return $context;
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}
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}
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return null;
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case 1: return array_search(true,$queriedContexts);
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default: return false;
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}
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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 array with expected bridge paramters
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*/
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public function setDatas(array $inputs){
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if(!is_null($this->cache)){
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$this->cache->prepare($inputs);
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$time = $this->cache->getTime();
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if($time !== false && (time() - $this->getCacheDuration() < $time)){
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$this->items = $this->cache->loadData();
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return;
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}
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}
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if(empty(static::PARAMETERS)){
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if(!empty($inputs)){
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$this->returnClientError('Invalid parameters value(s)');
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}
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$this->collectData();
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if(!is_null($this->cache)){
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$this->cache->saveData($this->getItems());
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}
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return;
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}
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if(!$this->validateData($inputs)){
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$this->returnClientError('Invalid parameters value(s)');
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}
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// Guess the paramter context from input data
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$this->queriedContext = $this->getQueriedContext($inputs);
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if(is_null($this->queriedContext)){
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$this->returnClientError('Required parameter(s) missing');
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} elseif($this->queriedContext === false){
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$this->returnClientError('Mixed context parameters');
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}
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$this->setInputs($inputs, $this->queriedContext);
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$this->collectData();
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if(!is_null($this->cache)){
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$this->cache->saveData($this->getItems());
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}
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}
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function getInput($input){
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if(!isset($this->inputs[$this->queriedContext][$input]['value'])){
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return null;
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}
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return $this->inputs[$this->queriedContext][$input]['value'];
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}
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public function getName(){
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return static::NAME;
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}
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public function getURI(){
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return static::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, $content);
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}
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}
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return str_get_html($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){
|
|
// TODO build this from the variable given to Cache
|
|
$cacheDir = __DIR__ . '/../cache/pages/';
|
|
$filepath = $this->buildCacheFilePath($url, $cacheDir);
|
|
$this->debugMessage('removing from cache \'' . $filepath . '\'');
|
|
unlink($filepath);
|
|
}
|
|
}
|
|
|
|
abstract class RssExpander extends HttpCachingBridgeAbstract {
|
|
|
|
private $name;
|
|
private $uri;
|
|
private $description;
|
|
|
|
public function collectExpandableDatas($name){
|
|
if(empty($name)){
|
|
$this->returnServerError('There is no $name for this RSS expander');
|
|
}
|
|
|
|
$this->debugMessage('Loading from ' . $name);
|
|
|
|
/* Notice we do not use cache here on purpose:
|
|
* we want a fresh view of the RSS stream each time
|
|
*/
|
|
$content = $this->getContents($name) or $this->returnServerError('Could not request ' . $name);
|
|
|
|
$rssContent = simplexml_load_string($content);
|
|
$this->debugMessage('loaded RSS from ' . $name);
|
|
// TODO insert RSS format detection
|
|
// For now we always assume RSS 2.0
|
|
$this->collect_RSS_2_0_data($rssContent);
|
|
}
|
|
|
|
protected function collect_RSS_2_0_data($rssContent){
|
|
$rssContent = $rssContent->channel[0];
|
|
$this->debugMessage('RSS content is ===========\n' . var_export($rssContent, true) . '===========');
|
|
$this->load_RSS_2_0_feed_data($rssContent);
|
|
foreach($rssContent->item as $item){
|
|
$this->debugMessage('parsing item ' . var_export($item, true));
|
|
$this->items[] = $this->parseRSSItem($item);
|
|
}
|
|
}
|
|
|
|
protected function RSS_2_0_time_to_timestamp($item){
|
|
return DateTime::createFromFormat('D, d M Y H:i:s e', $item->pubDate)->getTimestamp();
|
|
}
|
|
|
|
// TODO set title, link, description, language, and so on
|
|
protected function load_RSS_2_0_feed_data($rssContent){
|
|
$this->name = trim($rssContent->title);
|
|
$this->uri = trim($rssContent->link);
|
|
$this->description = trim($rssContent->description);
|
|
}
|
|
|
|
/**
|
|
* Method should return, from a source RSS item given by lastRSS, one of our Items objects
|
|
* @param $item the input rss item
|
|
* @return a RSS-Bridge Item, with (hopefully) the whole content)
|
|
*/
|
|
abstract protected function parseRSSItem($item);
|
|
|
|
public function getURI(){
|
|
return $this->uri;
|
|
}
|
|
|
|
public function getName(){
|
|
return $this->name;
|
|
}
|
|
|
|
public function getDescription(){
|
|
return $this->description;
|
|
}
|
|
}
|