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efrain |
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<?php
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/**
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* SimplePie
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*
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* A PHP-Based RSS and Atom Feed Framework.
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* Takes the hard work out of managing a complete RSS/Atom solution.
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*
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* Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* * Neither the name of the SimplePie Team nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package SimplePie
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* @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
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* @author Ryan Parman
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* @author Sam Sneddon
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* @author Ryan McCue
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* @link http://simplepie.org/ SimplePie
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License
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*/
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namespace SimplePie\Content\Type;
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/**
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* Content-type sniffing
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*
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* Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06
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*
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* This is used since we can't always trust Content-Type headers, and is based
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* upon the HTML5 parsing rules.
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*
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*
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* This class can be overloaded with {@see \SimplePie\SimplePie::set_content_type_sniffer_class()}
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*
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* @package SimplePie
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* @subpackage HTTP
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*/
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class Sniffer
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{
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/**
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* File object
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*
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* @var \SimplePie\File
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*/
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public $file;
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/**
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* Create an instance of the class with the input file
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*
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* @param Sniffer $file Input file
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*/
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public function __construct($file)
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{
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$this->file = $file;
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}
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/**
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* Get the Content-Type of the specified file
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*
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* @return string Actual Content-Type
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*/
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public function get_type()
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{
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if (isset($this->file->headers['content-type'])) {
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if (!isset($this->file->headers['content-encoding'])
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&& ($this->file->headers['content-type'] === 'text/plain'
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|| $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1'
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|| $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1'
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|| $this->file->headers['content-type'] === 'text/plain; charset=UTF-8')) {
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return $this->text_or_binary();
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}
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if (($pos = strpos($this->file->headers['content-type'], ';')) !== false) {
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$official = substr($this->file->headers['content-type'], 0, $pos);
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} else {
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$official = $this->file->headers['content-type'];
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}
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$official = trim(strtolower($official));
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if ($official === 'unknown/unknown'
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|| $official === 'application/unknown') {
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return $this->unknown();
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} elseif (substr($official, -4) === '+xml'
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|| $official === 'text/xml'
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|| $official === 'application/xml') {
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return $official;
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} elseif (substr($official, 0, 6) === 'image/') {
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if ($return = $this->image()) {
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return $return;
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}
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return $official;
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} elseif ($official === 'text/html') {
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return $this->feed_or_html();
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}
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return $official;
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}
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return $this->unknown();
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}
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/**
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* Sniff text or binary
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*
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* @return string Actual Content-Type
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*/
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public function text_or_binary()
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{
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if (substr($this->file->body, 0, 2) === "\xFE\xFF"
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|| substr($this->file->body, 0, 2) === "\xFF\xFE"
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|| substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF"
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|| substr($this->file->body, 0, 3) === "\xEF\xBB\xBF") {
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return 'text/plain';
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} elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body)) {
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return 'application/octet-stream';
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}
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return 'text/plain';
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}
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/**
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* Sniff unknown
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*
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* @return string Actual Content-Type
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*/
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public function unknown()
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{
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$ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20");
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if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html'
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|| strtolower(substr($this->file->body, $ws, 5)) === '<html'
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|| strtolower(substr($this->file->body, $ws, 7)) === '<script') {
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return 'text/html';
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} elseif (substr($this->file->body, 0, 5) === '%PDF-') {
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return 'application/pdf';
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} elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-') {
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return 'application/postscript';
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} elseif (substr($this->file->body, 0, 6) === 'GIF87a'
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|| substr($this->file->body, 0, 6) === 'GIF89a') {
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return 'image/gif';
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} elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {
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return 'image/png';
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} elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") {
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return 'image/jpeg';
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} elseif (substr($this->file->body, 0, 2) === "\x42\x4D") {
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return 'image/bmp';
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} elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") {
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return 'image/vnd.microsoft.icon';
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}
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return $this->text_or_binary();
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}
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/**
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* Sniff images
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*
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* @return string Actual Content-Type
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*/
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public function image()
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{
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if (substr($this->file->body, 0, 6) === 'GIF87a'
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|| substr($this->file->body, 0, 6) === 'GIF89a') {
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return 'image/gif';
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} elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {
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return 'image/png';
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} elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") {
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return 'image/jpeg';
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} elseif (substr($this->file->body, 0, 2) === "\x42\x4D") {
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return 'image/bmp';
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} elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") {
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return 'image/vnd.microsoft.icon';
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}
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return false;
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}
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/**
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* Sniff HTML
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*
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* @return string Actual Content-Type
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*/
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public function feed_or_html()
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{
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$len = strlen($this->file->body);
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$pos = strspn($this->file->body, "\x09\x0A\x0D\x20\xEF\xBB\xBF");
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while ($pos < $len) {
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switch ($this->file->body[$pos]) {
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case "\x09":
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case "\x0A":
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case "\x0D":
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case "\x20":
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$pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos);
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continue 2;
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case '<':
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$pos++;
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break;
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default:
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return 'text/html';
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}
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if (substr($this->file->body, $pos, 3) === '!--') {
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$pos += 3;
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if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false) {
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$pos += 3;
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} else {
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return 'text/html';
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}
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} elseif (substr($this->file->body, $pos, 1) === '!') {
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if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false) {
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$pos++;
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} else {
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return 'text/html';
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}
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} elseif (substr($this->file->body, $pos, 1) === '?') {
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if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false) {
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$pos += 2;
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} else {
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return 'text/html';
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}
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} elseif (substr($this->file->body, $pos, 3) === 'rss'
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|| substr($this->file->body, $pos, 7) === 'rdf:RDF') {
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return 'application/rss+xml';
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} elseif (substr($this->file->body, $pos, 4) === 'feed') {
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return 'application/atom+xml';
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} else {
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return 'text/html';
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}
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}
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return 'text/html';
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}
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}
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class_alias('SimplePie\Content\Type\Sniffer', 'SimplePie_Content_Type_Sniffer');
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