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Editing: Sniffer.php
<?php // SPDX-FileCopyrightText: 2004-2023 Ryan Parman, Sam Sneddon, Ryan McCue // SPDX-License-Identifier: BSD-3-Clause declare(strict_types=1); namespace SimplePie\Content\Type; use InvalidArgumentException; use SimplePie\File; use SimplePie\HTTP\Response; /** * 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()} */ class Sniffer { /** * File object * * @var File|Response */ public $file; /** * Create an instance of the class with the input file * * @param File|Response $file Input file */ public function __construct(/* File */ $file) { if (!is_object($file) || !$file instanceof Response) { // For BC we're asking for `File`, but internally we accept every `Response` implementation throw new InvalidArgumentException(sprintf( '%s(): Argument #1 ($file) must be of type %s', __METHOD__, File::class ), 1); } $this->file = $file; } /** * Get the Content-Type of the specified file * * @return string Actual Content-Type */ public function get_type() { $content_type = $this->file->has_header('content-type') ? $this->file->get_header_line('content-type') : null; $content_encoding = $this->file->has_header('content-encoding') ? $this->file->get_header_line('content-encoding') : null; if ($content_type !== null) { if ($content_encoding === null && ($content_type === 'text/plain' || $content_type === 'text/plain; charset=ISO-8859-1' || $content_type === 'text/plain; charset=iso-8859-1' || $content_type === 'text/plain; charset=UTF-8')) { return $this->text_or_binary(); } if (($pos = strpos($content_type, ';')) !== false) { $official = substr($content_type, 0, $pos); } else { $official = $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() { $body = $this->file->get_body_content(); if (substr($body, 0, 2) === "\xFE\xFF" || substr($body, 0, 2) === "\xFF\xFE" || substr($body, 0, 4) === "\x00\x00\xFE\xFF" || substr($body, 0, 3) === "\xEF\xBB\xBF") { return 'text/plain'; } elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $body)) { return 'application/octet-stream'; } return 'text/plain'; } /** * Sniff unknown * * @return string Actual Content-Type */ public function unknown() { $body = $this->file->get_body_content(); $ws = strspn($body, "\x09\x0A\x0B\x0C\x0D\x20"); if (strtolower(substr($body, $ws, 14)) === '<!doctype html' || strtolower(substr($body, $ws, 5)) === '<html' || strtolower(substr($body, $ws, 7)) === '<script') { return 'text/html'; } elseif (substr($body, 0, 5) === '%PDF-') { return 'application/pdf'; } elseif (substr($body, 0, 11) === '%!PS-Adobe-') { return 'application/postscript'; } elseif (substr($body, 0, 6) === 'GIF87a' || substr($body, 0, 6) === 'GIF89a') { return 'image/gif'; } elseif (substr($body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { return 'image/png'; } elseif (substr($body, 0, 3) === "\xFF\xD8\xFF") { return 'image/jpeg'; } elseif (substr($body, 0, 2) === "\x42\x4D") { return 'image/bmp'; } elseif (substr($body, 0, 4) === "\x00\x00\x01\x00") { return 'image/vnd.microsoft.icon'; } return $this->text_or_binary(); } /** * Sniff images * * @return string|false Actual Content-Type */ public function image() { $body = $this->file->get_body_content(); if (substr($body, 0, 6) === 'GIF87a' || substr($body, 0, 6) === 'GIF89a') { return 'image/gif'; } elseif (substr($body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { return 'image/png'; } elseif (substr($body, 0, 3) === "\xFF\xD8\xFF") { return 'image/jpeg'; } elseif (substr($body, 0, 2) === "\x42\x4D") { return 'image/bmp'; } elseif (substr($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() { $body = $this->file->get_body_content(); $len = strlen($body); $pos = strspn($body, "\x09\x0A\x0D\x20\xEF\xBB\xBF"); while ($pos < $len) { switch ($body[$pos]) { case "\x09": case "\x0A": case "\x0D": case "\x20": $pos += strspn($body, "\x09\x0A\x0D\x20", $pos); continue 2; case '<': $pos++; break; default: return 'text/html'; } if (substr($body, $pos, 3) === '!--') { $pos += 3; if ($pos < $len && ($pos = strpos($body, '-->', $pos)) !== false) { $pos += 3; } else { return 'text/html'; } } elseif (substr($body, $pos, 1) === '!') { if ($pos < $len && ($pos = strpos($body, '>', $pos)) !== false) { $pos++; } else { return 'text/html'; } } elseif (substr($body, $pos, 1) === '?') { if ($pos < $len && ($pos = strpos($body, '?>', $pos)) !== false) { $pos += 2; } else { return 'text/html'; } } elseif (substr($body, $pos, 3) === 'rss' || substr($body, $pos, 7) === 'rdf:RDF') { return 'application/rss+xml'; } elseif (substr($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');
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