<?php
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/*
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* This file is part of the overtrue/wechat.
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*
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* (c) overtrue <i@overtrue.me>
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*
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* This source file is subject to the MIT license that is bundled
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* with this source code in the file LICENSE.
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*/
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namespace EasyWeChat\Kernel\Support;
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use finfo;
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/**
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* Class File.
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*/
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class File
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{
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/**
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* MIME mapping.
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*
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* @var array
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*/
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protected static $extensionMap = [
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'audio/wav' => '.wav',
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'audio/x-ms-wma' => '.wma',
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'video/x-ms-wmv' => '.wmv',
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'video/mp4' => '.mp4',
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'audio/mpeg' => '.mp3',
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'audio/amr' => '.amr',
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'application/vnd.rn-realmedia' => '.rm',
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'audio/mid' => '.mid',
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'image/bmp' => '.bmp',
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'image/gif' => '.gif',
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'image/png' => '.png',
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'image/tiff' => '.tiff',
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'image/jpeg' => '.jpg',
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'application/pdf' => '.pdf',
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// 列举更多的文件 mime, 企业号是支持的,公众平台这边之后万一也更新了呢
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'application/msword' => '.doc',
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'application/vnd.openxmlformats-officedocument.wordprocessingml.document' => '.docx',
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'application/vnd.openxmlformats-officedocument.wordprocessingml.template' => '.dotx',
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'application/vnd.ms-word.document.macroEnabled.12' => '.docm',
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'application/vnd.ms-word.template.macroEnabled.12' => '.dotm',
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'application/vnd.ms-excel' => '.xls',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' => '.xlsx',
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'application/vnd.openxmlformats-officedocument.spreadsheetml.template' => '.xltx',
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'application/vnd.ms-excel.sheet.macroEnabled.12' => '.xlsm',
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'application/vnd.ms-excel.template.macroEnabled.12' => '.xltm',
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'application/vnd.ms-excel.addin.macroEnabled.12' => '.xlam',
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'application/vnd.ms-excel.sheet.binary.macroEnabled.12' => '.xlsb',
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'application/vnd.ms-powerpoint' => '.ppt',
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'application/vnd.openxmlformats-officedocument.presentationml.presentation' => '.pptx',
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'application/vnd.openxmlformats-officedocument.presentationml.template' => '.potx',
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'application/vnd.openxmlformats-officedocument.presentationml.slideshow' => '.ppsx',
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'application/vnd.ms-powerpoint.addin.macroEnabled.12' => '.ppam',
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];
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/**
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* File header signatures.
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*
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* @var array
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*/
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protected static $signatures = [
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'ffd8ff' => '.jpg',
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'424d' => '.bmp',
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'47494638' => '.gif',
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'2f55736572732f6f7665' => '.png',
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'89504e47' => '.png',
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'494433' => '.mp3',
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'fffb' => '.mp3',
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'fff3' => '.mp3',
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'3026b2758e66cf11' => '.wma',
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'52494646' => '.wav',
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'57415645' => '.wav',
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'41564920' => '.avi',
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'000001ba' => '.mpg',
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'000001b3' => '.mpg',
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'2321414d52' => '.amr',
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'25504446' => '.pdf',
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];
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/**
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* Return steam extension.
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*
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* @param string $stream
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*
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* @return string|false
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*/
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public static function getStreamExt($stream)
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{
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$ext = self::getExtBySignature($stream);
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try {
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if (empty($ext) && is_readable($stream)) {
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$stream = file_get_contents($stream);
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}
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} catch (\Exception $e) {
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}
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$fileInfo = new finfo(FILEINFO_MIME);
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$mime = strstr($fileInfo->buffer($stream), ';', true);
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return isset(self::$extensionMap[$mime]) ? self::$extensionMap[$mime] : $ext;
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}
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/**
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* Get file extension by file header signature.
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*
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* @param string $stream
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*
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* @return string
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*/
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public static function getExtBySignature($stream)
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{
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$prefix = strval(bin2hex(mb_strcut($stream, 0, 10)));
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foreach (self::$signatures as $signature => $extension) {
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if (0 === strpos($prefix, strval($signature))) {
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return $extension;
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}
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}
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return '';
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}
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}
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