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<?php
/**
* SimplePie
*
* A PHP-Based RSS and Atom Feed Framework.
* Takes the hard work out of managing a complete RSS/Atom solution.
*
* Copyright (c) 2004-2022, 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
*/
namespace SimplePie\Content\Type;
/**
* 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\SimplePie::set_content_type_sniffer_class()}
*
* @package SimplePie
* @subpackage HTTP
*/
class Sniffer
{
/**
* File object
*
* @var \SimplePie\File
*/
public $file;
/**
* Create an instance of the class with the input file
*
* @param 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';
}
}
class_alias('SimplePie\Content\Type\Sniffer', 'SimplePie_Content_Type_Sniffer');