/vendor/league/flysystem/src/Util/MimeType.php

<?php

namespace League\Flysystem\Util;

use Finfo;

/**
 * @internal
 */
class MimeType
{
    /**
     * Detects MIME Type based on given content.
     *
     * @param mixed $content
     *
     * @return string|null MIME Type or NULL if no mime type detected
     */
    public static function detectByContent($content)
    {
        if ( ! class_exists('Finfo') || ! is_string($content)) {
            return;
        }

        $finfo = new Finfo(FILEINFO_MIME_TYPE);
        $mimeType = $finfo->buffer($content);

        return $mimeType ?: null;
    }

    /**
     * Detects MIME Type based on file extension.
     *
     * @param string $extension
     *
     * @return string|null MIME Type or NULL if no extension detected
     */
    public static function detectByFileExtension($extension)
    {
        static $extensionToMimeTypeMap;

        if (! $extensionToMimeTypeMap) {
            $extensionToMimeTypeMap = static::getExtensionToMimeTypeMap();
        }

        if (isset($extensionToMimeTypeMap[$extension])) {
            return $extensionToMimeTypeMap[$extension];
        }

        return 'text/plain';
    }

    /**
     * @param string $filename
     *
     * @return string
     */
    public static function detectByFilename($filename)
    {
        $extension = pathinfo($filename, PATHINFO_EXTENSION);

        return empty($extension) ? 'text/plain' : static::detectByFileExtension($extension);
    }

    /**
     * @return array Map of file extension to MIME Type
     */
    public static function getExtensionToMimeTypeMap()
    {
        return [
            'hqx'   => 'application/mac-binhex40',
            'cpt'   => 'application/mac-compactpro',
            'csv'   => 'text/x-comma-separated-values',
            'bin'   => 'application/octet-stream',
            'dms'   => 'application/octet-stream',
            'lha'   => 'application/octet-stream',
            'lzh'   => 'application/octet-stream',
            'exe'   => 'application/octet-stream',
            'class' => 'application/octet-stream',
            'psd'   => 'application/x-photoshop',
            'so'    => 'application/octet-stream',
            'sea'   => 'application/octet-stream',
            'dll'   => 'application/octet-stream',
            'oda'   => 'application/oda',
            'pdf'   => 'application/pdf',
            'ai'    => 'application/pdf',
            'eps'   => 'application/postscript',
            'ps'    => 'application/postscript',
            'smi'   => 'application/smil',
            'smil'  => 'application/smil',
            'mif'   => 'application/vnd.mif',
            'xls'   => 'application/vnd.ms-excel',
            'ppt'   => 'application/powerpoint',
            'pptx'  => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'wbxml' => 'application/wbxml',
            'wmlc'  => 'application/wmlc',
            'dcr'   => 'application/x-director',
            'dir'   => 'application/x-director',
            'dxr'   => 'application/x-director',
            'dvi'   => 'application/x-dvi',
            'gtar'  => 'application/x-gtar',
            'gz'    => 'application/x-gzip',
            'gzip'  => 'application/x-gzip',
            'php'   => 'application/x-httpd-php',
            'php4'  => 'application/x-httpd-php',
            'php3'  => 'application/x-httpd-php',
            'phtml' => 'application/x-httpd-php',
            'phps'  => 'application/x-httpd-php-source',
            'js'    => 'application/javascript',
            'swf'   => 'application/x-shockwave-flash',
            'sit'   => 'application/x-stuffit',
            'tar'   => 'application/x-tar',
            'tgz'   => 'application/x-tar',
            'z'     => 'application/x-compress',
            'xhtml' => 'application/xhtml+xml',
            'xht'   => 'application/xhtml+xml',
            'zip'   => 'application/x-zip',
            'rar'   => 'application/x-rar',
            'mid'   => 'audio/midi',
            'midi'  => 'audio/midi',
            'mpga'  => 'audio/mpeg',
            'mp2'   => 'audio/mpeg',
            'mp3'   => 'audio/mpeg',
            'aif'   => 'audio/x-aiff',
            'aiff'  => 'audio/x-aiff',
            'aifc'  => 'audio/x-aiff',
            'ram'   => 'audio/x-pn-realaudio',
            'rm'    => 'audio/x-pn-realaudio',
            'rpm'   => 'audio/x-pn-realaudio-plugin',
            'ra'    => 'audio/x-realaudio',
            'rv'    => 'video/vnd.rn-realvideo',
            'wav'   => 'audio/x-wav',
            'jpg'   => 'image/jpeg',
            'jpeg'  => 'image/jpeg',
            'jpe'   => 'image/jpeg',
            'png'   => 'image/png',
            'gif'   => 'image/gif',
            'bmp'   => 'image/bmp',
            'tiff'  => 'image/tiff',
            'tif'   => 'image/tiff',
            'svg'   => 'image/svg+xml',
            'css'   => 'text/css',
            'html'  => 'text/html',
            'htm'   => 'text/html',
            'shtml' => 'text/html',
            'txt'   => 'text/plain',
            'text'  => 'text/plain',
            'log'   => 'text/plain',
            'rtx'   => 'text/richtext',
            'rtf'   => 'text/rtf',
            'xml'   => 'application/xml',
            'xsl'   => 'application/xml',
            'mpeg'  => 'video/mpeg',
            'mpg'   => 'video/mpeg',
            'mpe'   => 'video/mpeg',
            'qt'    => 'video/quicktime',
            'mov'   => 'video/quicktime',
            'avi'   => 'video/x-msvideo',
            'movie' => 'video/x-sgi-movie',
            'doc'   => 'application/msword',
            'docx'  => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'dot'   => 'application/msword',
            'dotx'  => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'xlsx'  => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'word'  => 'application/msword',
            'xl'    => 'application/excel',
            'eml'   => 'message/rfc822',
            'json'  => 'application/json',
            'pem'   => 'application/x-x509-user-cert',
            'p10'   => 'application/x-pkcs10',
            'p12'   => 'application/x-pkcs12',
            'p7a'   => 'application/x-pkcs7-signature',
            'p7c'   => 'application/pkcs7-mime',
            'p7m'   => 'application/pkcs7-mime',
            'p7r'   => 'application/x-pkcs7-certreqresp',
            'p7s'   => 'application/pkcs7-signature',
            'crt'   => 'application/x-x509-ca-cert',
            'crl'   => 'application/pkix-crl',
            'der'   => 'application/x-x509-ca-cert',
            'kdb'   => 'application/octet-stream',
            'pgp'   => 'application/pgp',
            'gpg'   => 'application/gpg-keys',
            'sst'   => 'application/octet-stream',
            'csr'   => 'application/octet-stream',
            'rsa'   => 'application/x-pkcs7',
            'cer'   => 'application/pkix-cert',
            '3g2'   => 'video/3gpp2',
            '3gp'   => 'video/3gp',
            'mp4'   => 'video/mp4',
            'm4a'   => 'audio/x-m4a',
            'f4v'   => 'video/mp4',
            'webm'  => 'video/webm',
            'aac'   => 'audio/x-acc',
            'm4u'   => 'application/vnd.mpegurl',
            'm3u'   => 'text/plain',
            'xspf'  => 'application/xspf+xml',
            'vlc'   => 'application/videolan',
            'wmv'   => 'video/x-ms-wmv',
            'au'    => 'audio/x-au',
            'ac3'   => 'audio/ac3',
            'flac'  => 'audio/x-flac',
            'ogg'   => 'audio/ogg',
            'kmz'   => 'application/vnd.google-earth.kmz',
            'kml'   => 'application/vnd.google-earth.kml+xml',
            'ics'   => 'text/calendar',
            'zsh'   => 'text/x-scriptzsh',
            '7zip'  => 'application/x-7z-compressed',
            'cdr'   => 'application/cdr',
            'wma'   => 'audio/x-ms-wma',
            'jar'   => 'application/java-archive',
        ];
    }
}