rss-bridge/lib/BridgeAbstract.php

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PHP
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<?php
require_once(__DIR__ . '/BridgeInterface.php');
abstract class BridgeAbstract implements BridgeInterface {
const NAME = 'Unnamed bridge';
const URI = '';
const DESCRIPTION = 'No description provided';
const MAINTAINER = 'No maintainer';
const PARAMETERS = array();
public $useProxy = true;
protected $cache;
protected $items = array();
protected $inputs = array();
protected $queriedContext = '';
protected function returnError($message, $code){
throw new \HttpException($message, $code);
}
protected function returnClientError($message){
$this->returnError($message, 400);
}
protected function returnServerError($message){
$this->returnError($message, 500);
}
/**
* Return items stored in the bridge
* @return mixed
*/
public function getItems(){
return $this->items;
}
protected function validateTextValue($value, $pattern = null){
if(!is_null($pattern)){
$filteredValue = filter_var($value
, FILTER_VALIDATE_REGEXP
, array('options' => array(
'regexp' => '/^' . $pattern . '$/'
))
);
} else {
$filteredValue = filter_var($value);
}
if($filteredValue === false)
return null;
return $filteredValue;
}
protected function validateNumberValue($value){
$filteredValue = filter_var($value, FILTER_VALIDATE_INT);
if($filteredValue === false && !empty($value))
return null;
return $filteredValue;
}
protected function validateCheckboxValue($value){
$filteredValue = filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
if(is_null($filteredValue))
return null;
return $filteredValue;
}
protected function validateListValue($value, $expectedValues){
$filteredValue = filter_var($value);
if($filteredValue === false)
return null;
if(!in_array($filteredValue, $expectedValues)){ // Check sub-values?
foreach($expectedValues as $subName => $subValue){
if(is_array($subValue) && in_array($filteredValue, $subValue))
return $filteredValue;
}
return null;
}
return $filteredValue;
}
protected function validateData(&$data){
if(!is_array($data))
return false;
foreach($data as $name => $value){
$registered = false;
foreach(static::PARAMETERS as $context => $set){
if(array_key_exists($name, $set)){
$registered = true;
if(!isset($set[$name]['type'])){
$set[$name]['type'] = 'text';
}
switch($set[$name]['type']){
case 'number':
$data[$name] = $this->validateNumberValue($value);
break;
case 'checkbox':
$data[$name] = $this->validateCheckboxValue($value);
break;
case 'list':
$data[$name] = $this->validateListValue($value, $set[$name]['values']);
break;
default:
case 'text':
if(isset($set[$name]['pattern'])){
$data[$name] = $this->validateTextValue($value, $set[$name]['pattern']);
} else {
$data[$name] = $this->validateTextValue($value);
}
break;
}
if(is_null($data[$name])){
echo 'Parameter \'' . $name . '\' is invalid!' . PHP_EOL;
return false;
}
}
}
if(!$registered)
return false;
}
return true;
}
protected function setInputs(array $inputs, $queriedContext){
// Import and assign all inputs to their context
foreach($inputs as $name => $value){
foreach(static::PARAMETERS as $context => $set){
if(array_key_exists($name, static::PARAMETERS[$context])){
$this->inputs[$context][$name]['value'] = $value;
}
}
}
// Apply default values to missing data
$contexts = array($queriedContext);
if(array_key_exists('global', static::PARAMETERS)){
$contexts[] = 'global';
}
foreach($contexts as $context){
foreach(static::PARAMETERS[$context] as $name => $properties){
if(isset($this->inputs[$context][$name]['value'])){
continue;
}
$type = isset($properties['type']) ? $properties['type'] : 'text';
switch($type){
case 'checkbox':
if(!isset($properties['defaultValue'])){
$this->inputs[$context][$name]['value'] = false;
} else {
$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
}
break;
case 'list':
if(!isset($properties['defaultValue'])){
$firstItem = reset($properties['values']);
if(is_array($firstItem)){
$firstItem = reset($firstItem);
}
$this->inputs[$context][$name]['value'] = $firstItem;
} else {
$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
}
break;
default:
if(isset($properties['defaultValue'])){
$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
}
break;
}
}
}
// Copy global parameter values to the guessed context
if(array_key_exists('global', static::PARAMETERS)){
foreach(static::PARAMETERS['global'] as $name => $properties){
if(isset($inputs[$name])){
$value = $inputs[$name];
} elseif (isset($properties['value'])){
$value = $properties['value'];
} else {
continue;
}
$this->inputs[$queriedContext][$name]['value'] = $value;
}
}
// Only keep guessed context parameters values
if(isset($this->inputs[$queriedContext])){
$this->inputs = array($queriedContext => $this->inputs[$queriedContext]);
} else {
$this->inputs = array();
}
}
protected function getQueriedContext(array $inputs){
$queriedContexts = array();
foreach(static::PARAMETERS as $context => $set){
$queriedContexts[$context] = null;
foreach($set as $id => $properties){
if(isset($inputs[$id]) && !empty($inputs[$id])){
$queriedContexts[$context] = true;
} elseif(isset($properties['required'])
&& $properties['required'] === true){
$queriedContexts[$context] = false;
break;
}
}
}
if(array_key_exists('global', static::PARAMETERS)
&& $queriedContexts['global'] === false){
return null;
}
unset($queriedContexts['global']);
switch(array_sum($queriedContexts)){
case 0:
foreach($queriedContexts as $context => $queried){
if (is_null($queried)){
return $context;
}
}
return null;
case 1: return array_search(true, $queriedContexts);
default: return false;
}
}
/**
* Defined datas with parameters depending choose bridge
* Note : you can define a cache with "setCache"
* @param array array with expected bridge paramters
*/
public function setDatas(array $inputs){
if(!is_null($this->cache)){
$this->cache->prepare($inputs);
$time = $this->cache->getTime();
if($time !== false && (time() - $this->getCacheDuration() < $time)){
$this->items = $this->cache->loadData();
return;
}
}
if(empty(static::PARAMETERS)){
if(!empty($inputs)){
$this->returnClientError('Invalid parameters value(s)');
}
$this->collectData();
if(!is_null($this->cache)){
$this->cache->saveData($this->getItems());
}
return;
}
if(!$this->validateData($inputs)){
$this->returnClientError('Invalid parameters value(s)');
}
// Guess the paramter context from input data
$this->queriedContext = $this->getQueriedContext($inputs);
if(is_null($this->queriedContext)){
$this->returnClientError('Required parameter(s) missing');
} elseif($this->queriedContext === false){
$this->returnClientError('Mixed context parameters');
}
$this->setInputs($inputs, $this->queriedContext);
$this->collectData();
if(!is_null($this->cache)){
$this->cache->saveData($this->getItems());
}
}
function getInput($input){
if(!isset($this->inputs[$this->queriedContext][$input]['value'])){
return null;
}
return $this->inputs[$this->queriedContext][$input]['value'];
}
public function getName(){
return static::NAME;
}
public function getURI(){
return static::URI;
}
public function getCacheDuration(){
return 3600;
}
public function setCache(\CacheAbstract $cache){
$this->cache = $cache;
}
public function debugMessage($text){
if(!file_exists('DEBUG')) {
return;
}
$backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 3);
$calling = $backtrace[2];
$message = $calling['file'] . ':'
. $calling['line'] . ' class '
. get_class($this) . '->'
. $calling['function'] . ' - '
. $text;
error_log($message);
}
protected function getContents($url
, $use_include_path = false
, $context = null
, $offset = 0
, $maxlen = null){
$contextOptions = array(
'http' => array(
'user_agent' => ini_get('user_agent')
)
);
if(defined('PROXY_URL') && $this->useProxy){
$contextOptions['http']['proxy'] = PROXY_URL;
$contextOptions['http']['request_fulluri'] = true;
if(is_null($context)){
$context = stream_context_create($contextOptions);
} else {
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$prevContext = $context;
if(!stream_context_set_option($context, $contextOptions)){
$context = $prevContext;
}
}
}
if(is_null($maxlen)){
$content = @file_get_contents($url, $use_include_path, $context, $offset);
} else {
$content = @file_get_contents($url, $use_include_path, $context, $offset, $maxlen);
}
if($content === false)
$this->debugMessage('Cant\'t download ' . $url);
// handle compressed data
foreach($http_response_header as $header){
if(stristr($header, 'content-encoding')){
switch(true){
case stristr($header, 'gzip'):
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$content = gzinflate(substr($content, 10, -8));
break;
case stristr($header, 'compress'):
//TODO
case stristr($header, 'deflate'):
//TODO
case stristr($header, 'brotli'):
//TODO
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$this->returnServerError($header . '=> Not implemented yet');
break;
case stristr($header, 'identity'):
break;
default:
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$this->returnServerError($header . '=> Unknown compression');
}
}
}
return $content;
}
protected function getSimpleHTMLDOM($url
, $use_include_path = false
, $context = null
, $offset = 0
, $maxLen = null
, $lowercase = true
, $forceTagsClosed = true
, $target_charset = DEFAULT_TARGET_CHARSET
, $stripRN = true
, $defaultBRText = DEFAULT_BR_TEXT
, $defaultSpanText = DEFAULT_SPAN_TEXT){
$content = $this->getContents($url, $use_include_path, $context, $offset, $maxLen);
return str_get_html($content
, $lowercase
, $forceTagsClosed
, $target_charset
, $stripRN
, $defaultBRText
, $defaultSpanText);
}
/**
* Maintain locally cached versions of pages to avoid multiple downloads.
* @param url url to cache
* @param duration duration of the cache file in seconds (default: 24h/86400s)
* @return content of the file as string
*/
public function getSimpleHTMLDOMCached($url
, $duration = 86400
, $use_include_path = false
, $context = null
, $offset = 0
, $maxLen = null
, $lowercase = true
, $forceTagsClosed = true
, $target_charset = DEFAULT_TARGET_CHARSET
, $stripRN = true
, $defaultBRText = DEFAULT_BR_TEXT
, $defaultSpanText = DEFAULT_SPAN_TEXT){
$this->debugMessage('Caching url ' . $url . ', duration ' . $duration);
$filepath = __DIR__ . '/../cache/pages/' . sha1($url) . '.cache';
$this->debugMessage('Cache file ' . $filepath);
if(file_exists($filepath) && filectime($filepath) < time() - $duration){
unlink ($filepath);
$this->debugMessage('Cached file deleted: ' . $filepath);
}
if(file_exists($filepath)){
$this->debugMessage('Loading cached file ' . $filepath);
touch($filepath);
$content = file_get_contents($filepath);
} else {
$this->debugMessage('Caching ' . $url . ' to ' . $filepath);
$dir = substr($filepath, 0, strrpos($filepath, '/'));
if(!is_dir($dir)){
$this->debugMessage('Creating directory ' . $dir);
mkdir($dir, 0777, true);
}
$content = $this->getContents($url, $use_include_path, $context, $offset, $maxLen);
if($content !== false){
file_put_contents($filepath, $content);
}
}
return str_get_html($content
, $lowercase
, $forceTagsClosed
, $target_charset
, $stripRN
, $defaultBRText
, $defaultSpanText);
}
}