使用NO FILE EXTENSION在PHP中獲取MIME類型

Question

我有一個名為Prestashop的電子商務包。 它們允許您銷售虛擬產品，可下載的項目，如軟件，電子書等。

他們的軟件存在問題，他們將可下載產品的物理文件名命名為40-char hash，沒有擴展名。 然后，當客戶下載文件時，系統應檢查MIME類型，以便在將文件發送到客戶的瀏覽器之前將其設置在標題中。

這就是問題所在。 他們使用四種方法來確定MIME類型。

1. finfo_open()函數，這個擴展恰好沒有安裝在我的主機上，所以它失敗了。
2. mime_content_type()函數，這將獲取沒有擴展名的文件，並返回“text / plain”MIME類型，無論MIME類型實際是什么。 這個功能已被棄用，我的想法是他們根本不應該使用它。
3. exec('file -bi '.escapeshellarg($file)) 。 這也失敗了我的主人。
4. 用於匹配MIME類型的擴展數組。

我很難解決這個問題，因為他們將文件命名為，當你將它添加到后台沒有擴展名時。 我很難看到這一切都有用。

我已經嘗試了許多其他修復，包括從cURL調用獲取CURLINFO_CONTENT_TYPE以下載文件，BTW為同一文件返回'text / plain'。

關於如何解決這個問題的任何想法？

解決方案用...

if (empty($mime_type))
{
    $bName = basename($filename);
    $bName = explode('.', $bName);
    $bName = strtolower($bName[count($bName) - 1]);

    $mimeTypes = array(
    'ez'        => 'application/andrew-inset',
    'atom'      => 'application/atom+xml',
    'jar'       => 'application/java-archive',
    'hqx'       => 'application/mac-binhex40',
    'cpt'       => 'application/mac-compactpro',
    'mathml'    => 'application/mathml+xml',
    'doc'       => 'application/msword',
    'dat'       => 'application/octet-stream',
    'oda'       => 'application/oda',
    'ogg'       => 'application/ogg',
    'pdf'       => 'application/pdf',
    'ai'        => 'application/postscript',
    'eps'       => 'application/postscript',
    'ps'        => 'application/postscript',
    'rdf'       => 'application/rdf+xml',
    'rss'       => 'application/rss+xml',
    'smi'       => 'application/smil',
    'smil'      => 'application/smil',
    'gram'      => 'application/srgs',
    'grxml'     => 'application/srgs+xml',
    'kml'       => 'application/vnd.google-earth.kml+xml',
    'kmz'       => 'application/vnd.google-earth.kmz',
    'mif'       => 'application/vnd.mif',
    'xul'       => 'application/vnd.mozilla.xul+xml',
    'xls'       => 'application/vnd.ms-excel',
    'xlb'       => 'application/vnd.ms-excel',
    'xlt'       => 'application/vnd.ms-excel',
    'xlam'      => 'application/vnd.ms-excel.addin.macroEnabled.12',
    'xlsb'      => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
    'xlsm'      => 'application/vnd.ms-excel.sheet.macroEnabled.12',
    'xltm'      => 'application/vnd.ms-excel.template.macroEnabled.12',
    'docm'      => 'application/vnd.ms-word.document.macroEnabled.12',
    'dotm'      => 'application/vnd.ms-word.template.macroEnabled.12',
    'ppam'      => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
    'pptm'      => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
    'ppsm'      => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12',
    'potm'      => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
    'ppt'       => 'application/vnd.ms-powerpoint',
    'pps'       => 'application/vnd.ms-powerpoint',
    'odc'       => 'application/vnd.oasis.opendocument.chart',
    'odb'       => 'application/vnd.oasis.opendocument.database',
    'odf'       => 'application/vnd.oasis.opendocument.formula',
    'odg'       => 'application/vnd.oasis.opendocument.graphics',
    'otg'       => 'application/vnd.oasis.opendocument.graphics-template',
    'odi'       => 'application/vnd.oasis.opendocument.image',
    'odp'       => 'application/vnd.oasis.opendocument.presentation',
    'otp'       => 'application/vnd.oasis.opendocument.presentation-template',
    'ods'       => 'application/vnd.oasis.opendocument.spreadsheet',
    'ots'       => 'application/vnd.oasis.opendocument.spreadsheet-template',
    'odt'       => 'application/vnd.oasis.opendocument.text',
    'odm'       => 'application/vnd.oasis.opendocument.text-master',
    'ott'       => 'application/vnd.oasis.opendocument.text-template',
    'oth'       => 'application/vnd.oasis.opendocument.text-web',
    'potx'      => 'application/vnd.openxmlformats-officedocument.presentationml.template',
    'ppsx'      => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
    'pptx'      => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
    'xlsx'      => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
    'xltx'      => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
    'docx'      => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
    'dotx'      => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
    'vsd'       => 'application/vnd.visio',
    'wbxml'     => 'application/vnd.wap.wbxml',
    'wmlc'      => 'application/vnd.wap.wmlc',
    'wmlsc'     => 'application/vnd.wap.wmlscriptc',
    'vxml'      => 'application/voicexml+xml',
    'bcpio'     => 'application/x-bcpio',
    'vcd'       => 'application/x-cdlink',
    'pgn'       => 'application/x-chess-pgn',
    'cpio'      => 'application/x-cpio',
    'csh'       => 'application/x-csh',
    'dcr'       => 'application/x-director',
    'dir'       => 'application/x-director',
    'dxr'       => 'application/x-director',
    'dvi'       => 'application/x-dvi',
    'spl'       => 'application/x-futuresplash',
    'tgz'       => 'application/x-gtar',
    'gtar'      => 'application/x-gtar',
    'hdf'       => 'application/x-hdf',
    'js'        => 'application/x-javascript',
    'skp'       => 'application/x-koan',
    'skd'       => 'application/x-koan',
    'skt'       => 'application/x-koan',
    'skm'       => 'application/x-koan',
    'latex'     => 'application/x-latex',
    'nc'        => 'application/x-netcdf',
    'cdf'       => 'application/x-netcdf',
    'sh'        => 'application/x-sh',
    'shar'      => 'application/x-shar',
    'swf'       => 'application/x-shockwave-flash',
    'sit'       => 'application/x-stuffit',
    'sv4cpio'   => 'application/x-sv4cpio',
    'sv4crc'    => 'application/x-sv4crc',
    'tar'       => 'application/x-tar',
    'tcl'       => 'application/x-tcl',
    'tex'       => 'application/x-tex',
    'texinfo'   => 'application/x-texinfo',
    'texi'      => 'application/x-texinfo',
    't'         => 'application/x-troff',
    'tr'        => 'application/x-troff',
    'roff'      => 'application/x-troff',
    'man'       => 'application/x-troff-man',
    'me'        => 'application/x-troff-me',
    'ms'        => 'application/x-troff-ms',
    'ustar'     => 'application/x-ustar',
    'src'       => 'application/x-wais-source',
    'xhtml'     => 'application/xhtml+xml',
    'xht'       => 'application/xhtml+xml',
    'xslt'      => 'application/xslt+xml',
    'xml'       => 'application/xml',
    'xsl'       => 'application/xml',
    'dtd'       => 'application/xml-dtd',
    'zip'       => 'application/zip',
    'au'        => 'audio/basic',
    'snd'       => 'audio/basic',
    'mid'       => 'audio/midi',
    'midi'      => 'audio/midi',
    'kar'       => 'audio/midi',
    'mpga'      => 'audio/mpeg',
    'mp2'       => 'audio/mpeg',
    'mp3'       => 'audio/mpeg',
    'aif'       => 'audio/x-aiff',
    'aiff'      => 'audio/x-aiff',
    'aifc'      => 'audio/x-aiff',
    'm3u'       => 'audio/x-mpegurl',
    'wma'       => 'audio/x-ms-wma',
    'wax'       => 'audio/x-ms-wax',
    'ram'       => 'audio/x-pn-realaudio',
    'ra'        => 'audio/x-pn-realaudio',
    'rm'        => 'application/vnd.rn-realmedia',
    'wav'       => 'audio/x-wav',
    'pdb'       => 'chemical/x-pdb',
    'xyz'       => 'chemical/x-xyz',
    'bmp'       => 'image/bmp',
    'cgm'       => 'image/cgm',
    'gif'       => 'image/gif',
    'ief'       => 'image/ief',
    'jpeg'      => 'image/jpeg',
    'jpg'       => 'image/jpeg',
    'jpe'       => 'image/jpeg',
    'png'       => 'image/png',
    'svg'       => 'image/svg+xml',
    'tiff'      => 'image/tiff',
    'tif'       => 'image/tiff',
    'djvu'      => 'image/vnd.djvu',
    'djv'       => 'image/vnd.djvu',
    'wbmp'      => 'image/vnd.wap.wbmp',
    'ras'       => 'image/x-cmu-raster',
    'ico'       => 'image/x-icon',
    'pnm'       => 'image/x-portable-anymap',
    'pbm'       => 'image/x-portable-bitmap',
    'pgm'       => 'image/x-portable-graymap',
    'ppm'       => 'image/x-portable-pixmap',
    'rgb'       => 'image/x-rgb',
    'xbm'       => 'image/x-xbitmap',
    'psd'       => 'image/x-photoshop',
    'xpm'       => 'image/x-xpixmap',
    'xwd'       => 'image/x-xwindowdump',
    'eml'       => 'message/rfc822',
    'igs'       => 'model/iges',
    'iges'      => 'model/iges',
    'msh'       => 'model/mesh',
    'mesh'      => 'model/mesh',
    'silo'      => 'model/mesh',
    'wrl'       => 'model/vrml',
    'vrml'      => 'model/vrml',
    'ics'       => 'text/calendar',
    'ifb'       => 'text/calendar',
    'css'       => 'text/css',
    'csv'       => 'text/csv',
    'html'      => 'text/html',
    'htm'       => 'text/html',
    'txt'       => 'text/plain',
    'asc'       => 'text/plain',
    'rtx'       => 'text/richtext',
    'rtf'       => 'text/rtf',
    'sgml'      => 'text/sgml',
    'sgm'       => 'text/sgml',
    'tsv'       => 'text/tab-separated-values',
    'wml'       => 'text/vnd.wap.wml',
    'wmls'      => 'text/vnd.wap.wmlscript',
    'etx'       => 'text/x-setext',
    'mpeg'      => 'video/mpeg',
    'mpg'       => 'video/mpeg',
    'mpe'       => 'video/mpeg',
    'qt'        => 'video/quicktime',
    'mov'       => 'video/quicktime',
    'mxu'       => 'video/vnd.mpegurl',
    'm4u'       => 'video/vnd.mpegurl',
    'flv'       => 'video/x-flv',
    'asf'       => 'video/x-ms-asf',
    'asx'       => 'video/x-ms-asf',
    'wmv'       => 'video/x-ms-wmv',
    'wm'        => 'video/x-ms-wm',
    'wmx'       => 'video/x-ms-wmx',
    'avi'       => 'video/x-msvideo',
    'ogv'       => 'video/ogg',
    'movie'     => 'video/x-sgi-movie',
    'ice'       => 'x-conference/x-cooltalk');  
    if (isset($mimeTypes[$bName]))
        $mime_type = $mimeTypes[$bName];
    else
        $mime_type = 'application/octet-stream';
}

Answer 1

getID3庫可以識別PDF和一堆其他文件類型。 看看這個：

http://getid3.sourceforge.net/

Answer 2

由於您可以訪問代碼，因此可以更改保存文件的方法，將文件轉換為哈希並添加一些代碼塊：
1）在保存文件之前，請自行保存擴展名。
2）在生成哈希之后，將擴展名附加到文件並將其保存或記錄在某處（數據文件，數據庫等）
3）並且在生成散列的任何地方更新以考慮擴展。

這可能不是解決軟件實際問題的方法，但它應該允許您保留文件類型...