319 lines
7.8 KiB
PHP
319 lines
7.8 KiB
PHP
<?php
|
|
/**
|
|
* SimplePie
|
|
*
|
|
* A PHP-Based RSS and Atom Feed Framework.
|
|
* Takes the hard work out of managing a complete RSS/Atom solution.
|
|
*
|
|
* Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without modification, are
|
|
* permitted provided that the following conditions are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright notice, this list of
|
|
* conditions and the following disclaimer.
|
|
*
|
|
* * Redistributions in binary form must reproduce the above copyright notice, this list
|
|
* of conditions and the following disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* * Neither the name of the SimplePie Team nor the names of its contributors may be used
|
|
* to endorse or promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
|
|
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
|
|
* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
|
|
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* @package SimplePie
|
|
* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
|
|
* @author Ryan Parman
|
|
* @author Sam Sneddon
|
|
* @author Ryan McCue
|
|
* @link http://simplepie.org/ SimplePie
|
|
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
|
|
*/
|
|
|
|
|
|
/**
|
|
* Content-type sniffing
|
|
*
|
|
* Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06
|
|
*
|
|
* This is used since we can't always trust Content-Type headers, and is based
|
|
* upon the HTML5 parsing rules.
|
|
*
|
|
*
|
|
* This class can be overloaded with {@see SimplePie::set_content_type_sniffer_class()}
|
|
*
|
|
* @package SimplePie
|
|
* @subpackage HTTP
|
|
*/
|
|
class SimplePie_Content_Type_Sniffer
|
|
{
|
|
/**
|
|
* File object
|
|
*
|
|
* @var SimplePie_File
|
|
*/
|
|
var $file;
|
|
|
|
/**
|
|
* Create an instance of the class with the input file
|
|
*
|
|
* @param SimplePie_Content_Type_Sniffer $file Input file
|
|
*/
|
|
public function __construct($file)
|
|
{
|
|
$this->file = $file;
|
|
}
|
|
|
|
/**
|
|
* Get the Content-Type of the specified file
|
|
*
|
|
* @return string Actual Content-Type
|
|
*/
|
|
public function get_type()
|
|
{
|
|
if (isset($this->file->headers['content-type']))
|
|
{
|
|
if (!isset($this->file->headers['content-encoding'])
|
|
&& ($this->file->headers['content-type'] === 'text/plain'
|
|
|| $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1'
|
|
|| $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1'
|
|
|| $this->file->headers['content-type'] === 'text/plain; charset=UTF-8'))
|
|
{
|
|
return $this->text_or_binary();
|
|
}
|
|
|
|
if (($pos = strpos($this->file->headers['content-type'], ';')) !== false)
|
|
{
|
|
$official = substr($this->file->headers['content-type'], 0, $pos);
|
|
}
|
|
else
|
|
{
|
|
$official = $this->file->headers['content-type'];
|
|
}
|
|
$official = trim(strtolower($official));
|
|
|
|
if ($official === 'unknown/unknown'
|
|
|| $official === 'application/unknown')
|
|
{
|
|
return $this->unknown();
|
|
}
|
|
elseif (substr($official, -4) === '+xml'
|
|
|| $official === 'text/xml'
|
|
|| $official === 'application/xml')
|
|
{
|
|
return $official;
|
|
}
|
|
elseif (substr($official, 0, 6) === 'image/')
|
|
{
|
|
if ($return = $this->image())
|
|
{
|
|
return $return;
|
|
}
|
|
|
|
return $official;
|
|
}
|
|
elseif ($official === 'text/html')
|
|
{
|
|
return $this->feed_or_html();
|
|
}
|
|
|
|
return $official;
|
|
}
|
|
|
|
return $this->unknown();
|
|
}
|
|
|
|
/**
|
|
* Sniff text or binary
|
|
*
|
|
* @return string Actual Content-Type
|
|
*/
|
|
public function text_or_binary()
|
|
{
|
|
if (substr($this->file->body, 0, 2) === "\xFE\xFF"
|
|
|| substr($this->file->body, 0, 2) === "\xFF\xFE"
|
|
|| substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF"
|
|
|| substr($this->file->body, 0, 3) === "\xEF\xBB\xBF")
|
|
{
|
|
return 'text/plain';
|
|
}
|
|
elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body))
|
|
{
|
|
return 'application/octet-stream';
|
|
}
|
|
|
|
return 'text/plain';
|
|
}
|
|
|
|
/**
|
|
* Sniff unknown
|
|
*
|
|
* @return string Actual Content-Type
|
|
*/
|
|
public function unknown()
|
|
{
|
|
$ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20");
|
|
if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html'
|
|
|| strtolower(substr($this->file->body, $ws, 5)) === '<html'
|
|
|| strtolower(substr($this->file->body, $ws, 7)) === '<script')
|
|
{
|
|
return 'text/html';
|
|
}
|
|
elseif (substr($this->file->body, 0, 5) === '%PDF-')
|
|
{
|
|
return 'application/pdf';
|
|
}
|
|
elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-')
|
|
{
|
|
return 'application/postscript';
|
|
}
|
|
elseif (substr($this->file->body, 0, 6) === 'GIF87a'
|
|
|| substr($this->file->body, 0, 6) === 'GIF89a')
|
|
{
|
|
return 'image/gif';
|
|
}
|
|
elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A")
|
|
{
|
|
return 'image/png';
|
|
}
|
|
elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF")
|
|
{
|
|
return 'image/jpeg';
|
|
}
|
|
elseif (substr($this->file->body, 0, 2) === "\x42\x4D")
|
|
{
|
|
return 'image/bmp';
|
|
}
|
|
elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00")
|
|
{
|
|
return 'image/vnd.microsoft.icon';
|
|
}
|
|
|
|
return $this->text_or_binary();
|
|
}
|
|
|
|
/**
|
|
* Sniff images
|
|
*
|
|
* @return string Actual Content-Type
|
|
*/
|
|
public function image()
|
|
{
|
|
if (substr($this->file->body, 0, 6) === 'GIF87a'
|
|
|| substr($this->file->body, 0, 6) === 'GIF89a')
|
|
{
|
|
return 'image/gif';
|
|
}
|
|
elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A")
|
|
{
|
|
return 'image/png';
|
|
}
|
|
elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF")
|
|
{
|
|
return 'image/jpeg';
|
|
}
|
|
elseif (substr($this->file->body, 0, 2) === "\x42\x4D")
|
|
{
|
|
return 'image/bmp';
|
|
}
|
|
elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00")
|
|
{
|
|
return 'image/vnd.microsoft.icon';
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Sniff HTML
|
|
*
|
|
* @return string Actual Content-Type
|
|
*/
|
|
public function feed_or_html()
|
|
{
|
|
$len = strlen($this->file->body);
|
|
$pos = strspn($this->file->body, "\x09\x0A\x0D\x20\xEF\xBB\xBF");
|
|
|
|
while ($pos < $len)
|
|
{
|
|
switch ($this->file->body[$pos])
|
|
{
|
|
case "\x09":
|
|
case "\x0A":
|
|
case "\x0D":
|
|
case "\x20":
|
|
$pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos);
|
|
continue 2;
|
|
|
|
case '<':
|
|
$pos++;
|
|
break;
|
|
|
|
default:
|
|
return 'text/html';
|
|
}
|
|
|
|
if (substr($this->file->body, $pos, 3) === '!--')
|
|
{
|
|
$pos += 3;
|
|
if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false)
|
|
{
|
|
$pos += 3;
|
|
}
|
|
else
|
|
{
|
|
return 'text/html';
|
|
}
|
|
}
|
|
elseif (substr($this->file->body, $pos, 1) === '!')
|
|
{
|
|
if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false)
|
|
{
|
|
$pos++;
|
|
}
|
|
else
|
|
{
|
|
return 'text/html';
|
|
}
|
|
}
|
|
elseif (substr($this->file->body, $pos, 1) === '?')
|
|
{
|
|
if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false)
|
|
{
|
|
$pos += 2;
|
|
}
|
|
else
|
|
{
|
|
return 'text/html';
|
|
}
|
|
}
|
|
elseif (substr($this->file->body, $pos, 3) === 'rss'
|
|
|| substr($this->file->body, $pos, 7) === 'rdf:RDF')
|
|
{
|
|
return 'application/rss+xml';
|
|
}
|
|
elseif (substr($this->file->body, $pos, 4) === 'feed')
|
|
{
|
|
return 'application/atom+xml';
|
|
}
|
|
else
|
|
{
|
|
return 'text/html';
|
|
}
|
|
}
|
|
|
|
return 'text/html';
|
|
}
|
|
}
|