Improve filtering (remove empty tags…)

This commit is contained in:
Frederic Guillot 2013-08-03 21:08:44 -04:00
parent 47a303dbb0
commit 6f062117e5
2 changed files with 37 additions and 204 deletions

View File

@ -9,6 +9,7 @@ class Filter
private $input = ''; private $input = '';
private $empty_tags = array(); private $empty_tags = array();
private $strip_content = false; private $strip_content = false;
private $is_code = false;
// Allow only these tags and attributes // Allow only these tags and attributes
public static $whitelist_tags = array( public static $whitelist_tags = array(
@ -186,6 +187,9 @@ class Filter
xml_parse($parser, $this->input, true); // We ignore parsing error (for old libxml) xml_parse($parser, $this->input, true); // We ignore parsing error (for old libxml)
xml_parser_free($parser); xml_parser_free($parser);
$this->data = $this->removeEmptyTags($this->data);
$this->data = $this->removeMultipleTags($this->data);
return $this->data; return $this->data;
} }
@ -195,6 +199,8 @@ class Filter
$empty_tag = false; $empty_tag = false;
$this->strip_content = false; $this->strip_content = false;
if ($this->is_code === false && $name === 'pre') $this->is_code = true;
if ($this->isPixelTracker($name, $attributes)) { if ($this->isPixelTracker($name, $attributes)) {
$empty_tag = true; $empty_tag = true;
@ -274,7 +280,6 @@ class Filter
} }
if (in_array($name, self::$blacklist_tags)) { if (in_array($name, self::$blacklist_tags)) {
$this->strip_content = true; $this->strip_content = true;
} }
@ -285,15 +290,25 @@ class Filter
public function endTag($parser, $name) public function endTag($parser, $name)
{ {
if (! array_pop($this->empty_tags) && $this->isAllowedTag($name)) { if (! array_pop($this->empty_tags) && $this->isAllowedTag($name)) {
$this->data .= $name !== 'img' && $name !== 'br' ? '</'.$name.'>' : '/>'; $this->data .= $name !== 'img' && $name !== 'br' ? '</'.$name.'>' : '/>';
} }
if ($this->is_code && $name === 'pre') $this->is_code = false;
} }
public function dataTag($parser, $content) public function dataTag($parser, $content)
{ {
if (! $this->strip_content) $this->data .= htmlspecialchars($content, ENT_QUOTES, 'UTF-8', false); $content = str_replace("\xc2\xa0", ' ', $content); // Replace &nbsp; with normal space
// Replace mutliple space by a single one
if (! $this->is_code) {
$content = preg_replace('!\s+!', ' ', $content);
}
if (! $this->strip_content && trim($content) !== '') {
$this->data .= htmlspecialchars($content, ENT_QUOTES, 'UTF-8', false);
}
} }
@ -420,4 +435,23 @@ class Filter
return true; return true;
} }
public function removeMultipleTags($data)
{
// Replace <br/><br/> by only one
return preg_replace("/(<br\s*\/?>\s*)+/", "<br/>", $data);
}
public function removeEmptyTags($data)
{
return preg_replace('/<([^<\/>]*)>([\s]*?|(?R))<\/\1>/imsU', '', $data);
}
public function removeHTMLTags($data)
{
return preg_replace('~<(?:!DOCTYPE|/?(?:html|head|body))[^>]*>\s*~i', '', $data);
}
} }

View File

@ -1,201 +0,0 @@
<?php
namespace PicoFeed;
require_once __DIR__.'/Logging.php';
class RemoteResource
{
public $user_agent;
public $timeout;
public $url;
public $etag;
public $last_modified;
public $is_modified = true;
public $content = '';
public function __construct($url, $timeout = 5, $user_agent = 'PicoFeed (https://github.com/fguillot/picoFeed)')
{
$this->url = $url;
$this->timeout = $timeout;
$this->user_agent = $user_agent;
return $this;
}
public function setLastModified($last_modified)
{
$this->last_modified = $last_modified;
return $this;
}
public function getLastModified()
{
return $this->last_modified;
}
public function setEtag($etag)
{
$this->etag = $etag;
return $this;
}
public function getEtag()
{
return $this->etag;
}
public function getUrl()
{
return $this->url;
}
public function getContent()
{
return $this->content;
}
public function isModified()
{
return $this->is_modified;
}
public function execute()
{
$response = $this->doRequest();
if ($response['status'] == 304) {
$this->is_modified = false;
}
else if ($response['status'] == 301 || $response['status'] == 302) {
if (isset($response['headers']['Location'])) {
$this->url = $response['headers']['Location'];
}
else if (isset($response['headers']['location'])) {
$this->url = $response['headers']['location'];
}
$this->execute();
}
else {
$this->etag = isset($response['headers']['ETag']) ? $response['headers']['ETag'] : '';
$this->last_modified = isset($response['headers']['Last-Modified']) ? $response['headers']['Last-Modified'] : '';
$this->content = $response['body'];
}
}
public function doRequest()
{
$http_code = 200;
$http_body = '';
$http_headers = array();
if (! function_exists('curl_init')) {
$http_body = @file_get_contents($this->url);
}
else {
Logging::log('Fetch URL: '.$this->url);
Logging::log('Etag: '.$this->etag);
Logging::log('Last-Modified: '.$this->last_modified);
$headers = array('Connection: close');
if ($this->etag) $headers[] = 'If-None-Match: '.$this->etag;
if ($this->last_modified) $headers[] = 'If-Modified-Since: '.$this->last_modified;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $this->url);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->timeout);
curl_setopt($ch, CURLOPT_TIMEOUT, $this->timeout);
curl_setopt($ch, CURLOPT_USERAGENT, $this->user_agent);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
curl_setopt($ch, CURLOPT_ENCODING, '');
// Don't check SSL certificates (for auto-signed certificates...)
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$http_response = curl_exec($ch);
if (curl_errno($ch)) {
Logging::log('cURL error: '.curl_error($ch));
curl_close($ch);
return array(
'status' => $http_code,
'body' => $http_body,
'headers' => $http_headers
);
}
Logging::log('cURL total time: '.curl_getinfo($ch, CURLINFO_TOTAL_TIME));
Logging::log('cURL dns lookup time: '.curl_getinfo($ch, CURLINFO_NAMELOOKUP_TIME));
Logging::log('cURL connect time: '.curl_getinfo($ch, CURLINFO_CONNECT_TIME));
Logging::log('cURL speed download: '.curl_getinfo($ch, CURLINFO_SPEED_DOWNLOAD));
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
$http_body = '';
$http_headers = array();
curl_close($ch);
$lines = explode("\r\n", $http_response);
$body_start = 0;
$i = 0;
foreach ($lines as $line) {
if ($line === '') {
$body_start = $i;
break;
}
else if (($p = strpos($line, ':')) !== false) {
$key = substr($line, 0, $p);
$value = substr($line, $p + 1);
$http_headers[trim($key)] = trim($value);
}
$i++;
}
$http_body = implode("\r\n", array_splice($lines, $i + 1));
}
Logging::log('HTTP status code: '.$http_code);
foreach ($http_headers as $header_name => $header_value) {
Logging::log('HTTP headers: '.$header_name.' => '.$header_value);
}
return array(
'status' => $http_code,
'body' => $http_body,
'headers' => $http_headers
);
}
}