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369 lines
13 KiB
369 lines
13 KiB
<?php |
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/** |
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* @file |
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* Class for determining MIME types and file extensions. |
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* |
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* This class inspired by Chris Jean's work, here: |
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* http://chrisjean.com/2009/02/14/generating-mime-type-in-php-is-not-magic/ |
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* |
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* It does some MIME trickery, inspired by the need to to deal with Openoffice |
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* and MS Office 2007 file formats -- which are often mis-interpreted by |
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* mime-magic, fileinfo, and the *nix `file` command. |
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* |
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* In Drupal 6, we also make use of file_get_mimetype. See: |
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* http://api.drupal.org/api/function/file_get_mimetype/6 |
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* ... however this only provides a uni-directional lookup (ext->mime). |
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* While I don't have a specific use case for a mime->extension lookup, I think |
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* it's good to have in here. |
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* |
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* Drupal 7 will have better mime handlers. See: |
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* http://api.drupal.org/api/function/file_default_mimetype_mapping/7 |
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*/ |
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class MimeDetect { |
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protected $protectedMimeTypes = array( |
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/* |
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* This is a shortlist of mimetypes which should catch most |
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* mimetype<-->extension lookups in the context of Islandora collections. |
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* |
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* It has been cut from a much longer list. |
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* |
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* Two types of mimetypes should be put in this list: |
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* 1) Special emerging formats which may not yet be expressed in the system |
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* mime.types file. |
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* 2) Heavily used mimetypes of particular importance to the Islandora |
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* project, as lookups against this list will be quicker and less |
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* resource intensive than other methods. |
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* |
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* Lookups are first checked against this short list. If no results are |
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* found, then the lookup function may move on to check other sources, |
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* namely the system's mime.types file. |
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* |
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* In most cases though, this short list should suffice. |
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* |
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* If modifying this list, please note that for promiscuous mimetypes |
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* (those which map to multiple extensions, such as text/plain) |
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* The function get_extension will always return the *LAST* extension in |
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* this list, so you should put your preferred extension *LAST*. |
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* |
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* e.g... |
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* "jpeg" => "image/jpeg", |
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* "jpe" => "image/jpeg", |
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* "jpg" => "image/jpeg", |
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* |
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* $this->get_extension('image/jpeg') will always return 'jpg'. |
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* |
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*/ |
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// Openoffice: |
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'odb' => 'application/vnd.oasis.opendocument.database', |
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'odc' => 'application/vnd.oasis.opendocument.chart', |
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'odf' => 'application/vnd.oasis.opendocument.formula', |
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'odg' => 'application/vnd.oasis.opendocument.graphics', |
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'odi' => 'application/vnd.oasis.opendocument.image', |
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'odm' => 'application/vnd.oasis.opendocument.text-master', |
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'odp' => 'application/vnd.oasis.opendocument.presentation', |
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'ods' => 'application/vnd.oasis.opendocument.spreadsheet', |
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'odt' => 'application/vnd.oasis.opendocument.text', |
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'otg' => 'application/vnd.oasis.opendocument.graphics-template', |
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'oth' => 'application/vnd.oasis.opendocument.text-web', |
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'otp' => 'application/vnd.oasis.opendocument.presentation-template', |
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'ots' => 'application/vnd.oasis.opendocument.spreadsheet-template', |
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'ott' => 'application/vnd.oasis.opendocument.text-template', |
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// Staroffice: |
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'stc' => 'application/vnd.sun.xml.calc.template', |
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'std' => 'application/vnd.sun.xml.draw.template', |
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'sti' => 'application/vnd.sun.xml.impress.template', |
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'stw' => 'application/vnd.sun.xml.writer.template', |
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'sxc' => 'application/vnd.sun.xml.calc', |
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'sxd' => 'application/vnd.sun.xml.draw', |
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'sxg' => 'application/vnd.sun.xml.writer.global', |
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'sxi' => 'application/vnd.sun.xml.impress', |
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'sxm' => 'application/vnd.sun.xml.math', |
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'sxw' => 'application/vnd.sun.xml.writer', |
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// K-office: |
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'kil' => 'application/x-killustrator', |
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'kpt' => 'application/x-kpresenter', |
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'kpr' => 'application/x-kpresenter', |
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'ksp' => 'application/x-kspread', |
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'kwt' => 'application/x-kword', |
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'kwd' => 'application/x-kword', |
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// Ms office 97: |
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'doc' => 'application/msword', |
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'xls' => 'application/vnd.ms-excel', |
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'ppt' => 'application/vnd.ms-powerpoint', |
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// Office2007: |
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'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document', |
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'docm' => 'application/vnd.ms-word.document.macroEnabled.12', |
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'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template', |
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'dotm' => 'application/vnd.ms-word.template.macroEnabled.12', |
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'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', |
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'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12', |
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'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template', |
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'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12', |
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'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12', |
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'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12', |
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'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation', |
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'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12', |
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'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow', |
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'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12', |
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'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template', |
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'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12', |
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'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12', |
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'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide', |
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'sldm' => 'application/vnd.ms-powerpoint.slide.macroEnabled.12', |
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// Wordperfect (who cares?): |
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'wpd' => 'application/wordperfect', |
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// Common and generic containers: |
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'pdf' => 'application/pdf', |
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'eps' => 'application/postscript', |
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'ps' => 'application/postscript', |
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'rtf' => 'text/rtf', |
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'rtx' => 'text/richtext', |
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'latex' => 'application/x-latex', |
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'tex' => 'application/x-tex', |
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'texi' => 'application/x-texinfo', |
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'texinfo' => 'application/x-texinfo', |
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// *ml: |
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'css' => 'text/css', |
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'htm' => 'text/html', |
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'html' => 'text/html', |
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'wbxml' => 'application/vnd.wap.wbxml', |
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'xht' => 'application/xhtml+xml', |
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'xhtml' => 'application/xhtml+xml', |
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'xsl' => 'text/xml', |
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'xml' => 'text/xml', |
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'csv' => 'text/csv', |
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'tsv' => 'text/tab-separated-values', |
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'txt' => 'text/plain', |
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// images: |
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"bmp" => "image/bmp", |
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'dng' => 'image/x-adobe-dng', |
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"gif" => "image/gif", |
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"ief" => "image/ief", |
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"jpeg" => "image/jpeg", |
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"jpe" => "image/jpeg", |
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"jpg" => "image/jpeg", |
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"jp2" => "image/jp2", |
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"png" => "image/png", |
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"tiff" => "image/tiff", |
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"tif" => "image/tiff", |
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"djvu" => "image/vnd.djvu", |
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"djv" => "image/vnd.djvu", |
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"wbmp" => "image/vnd.wap.wbmp", |
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"ras" => "image/x-cmu-raster", |
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"pnm" => "image/x-portable-anymap", |
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"pbm" => "image/x-portable-bitmap", |
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"pgm" => "image/x-portable-graymap", |
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"ppm" => "image/x-portable-pixmap", |
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"rgb" => "image/x-rgb", |
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"xbm" => "image/x-xbitmap", |
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"xpm" => "image/x-xpixmap", |
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"xwd" => "image/x-windowdump", |
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// videos: |
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"mpeg" => "video/mpeg", |
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"mpe" => "video/mpeg", |
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"mpg" => "video/mpeg", |
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"m4v" => "video/mp4", |
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"mp4" => "video/mp4", |
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"ogv" => "video/ogg", |
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"qt" => "video/quicktime", |
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"mov" => "video/quicktime", |
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"mxu" => "video/vnd.mpegurl", |
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"avi" => "video/x-msvideo", |
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"movie" => "video/x-sgi-movie", |
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"flv" => "video/x-flv", |
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"swf" => "application/x-shockwave-flash", |
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// Audio: |
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"mp3" => "audio/mpeg", |
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"mp4a" => "audio/mp4", |
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"m4a" => "audio/mp4", |
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"oga" => "audio/ogg", |
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"ogg" => "audio/ogg", |
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"flac" => "audio/x-flac", |
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"wav" => "audio/vnd.wave", |
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// Compressed formats: |
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// (note: http://svn.cleancode.org/svn/email/trunk/mime.types) |
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"tgz" => "application/x-gzip", |
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"gz" => "application/x-gzip", |
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"tar" => "application/x-tar", |
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"gtar" => "application/x-gtar", |
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"zip" => "application/x-zip", |
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// others: |
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'bin' => 'application/octet-stream', |
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); |
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protected $protectedFileExtensions; |
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protected $systemTypes; |
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protected $systemExts; |
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protected $etcMimeTypes = '/etc/mime.types'; |
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/** |
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* Construtor. |
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*/ |
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public function __construct() { |
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// Populate the reverse shortlist: |
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$this->protectedFileExtensions = array_flip($this->protectedMimeTypes); |
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// Pick up a local mime.types file if it is available. |
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if (is_readable('mime.types')) { |
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$this->etcMimeTypes = 'mime.types'; |
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} |
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} |
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/** |
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* Gets MIME type associated with the give file's extension. |
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* |
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* @param string $filename |
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* The filename |
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* @param bool $debug |
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* Returns a debug array. |
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* |
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* @return mixed |
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* string or an array |
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*/ |
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public function getMimetype($filename, $debug = FALSE) { |
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$file_name_and_extension = explode('.', $filename); |
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$ext = drupal_strtolower(array_pop($file_name_and_extension)); |
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if (!empty($this->protectedMimeTypes[$ext])) { |
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if (TRUE === $debug) { |
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return array('mime_type' => $this->protectedMimeTypes[$ext], 'method' => 'from_array'); |
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} |
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return $this->protectedMimeTypes[$ext]; |
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} |
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if (function_exists('file_get_mimetype')) { |
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$drupal_mimetype = file_get_mimetype($filename); |
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if ('application/octet-stream' != $drupal_mimetype) { |
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if (TRUE == $debug) { |
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return array('mime_type' => $drupal_mimetype, 'method' => 'file_get_mimetype'); |
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} |
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return $drupal_mimetype; |
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} |
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} |
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if (!isset($this->systemTypes)) { |
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$this->systemTypes = $this->systemExtensionMimetypes(); |
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} |
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if (isset($this->systemTypes[$ext])) { |
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if (TRUE == $debug) { |
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return array('mime_type' => $this->systemTypes[$ext], 'method' => 'mime.types'); |
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} |
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return $this->systemTypes[$ext]; |
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} |
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if (TRUE === $debug) { |
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return array('mime_type' => 'application/octet-stream', 'method' => 'last_resort'); |
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} |
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return 'application/octet-stream'; |
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} |
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/** |
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* Gets one valid file extension for a given MIME type. |
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* |
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* @param string $mime_type |
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* The MIME type. |
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* @param bool $debug |
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* Generated debug information? |
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* |
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* @return string |
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* The file extensions associated with the given MIME type. |
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*/ |
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public function getExtension($mime_type, $debug = FALSE) { |
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if (!empty($this->protectedFileExtensions[$mime_type])) { |
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if (TRUE == $debug) { |
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return array('extension' => $this->protectedFileExtensions[$mime_type], 'method' => 'from_array'); |
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} |
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return $this->protectedFileExtensions[$mime_type]; |
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} |
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if (!isset($this->systemExts)) { |
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$this->systemExts = $this->systemMimetypeExtensions(); |
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} |
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if (isset($this->systemExts[$mime_type])) { |
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if (TRUE == $debug) { |
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return array('extension' => $this->systemExts[$mime_type], 'method' => 'mime.types'); |
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} |
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return $this->systemExts[$mime_type]; |
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} |
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if (TRUE == $debug) { |
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return array('extension' => 'bin', 'method' => 'last_resort'); |
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} |
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return 'bin'; |
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} |
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/** |
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* Gets an associative array of MIME type and extension associations. |
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* |
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* Users the system mime.types file, or a local mime.types if one is found |
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* @see MIMEDetect::__constuctor() |
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* |
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* @return array |
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* An associative array where the keys are MIME types and the values |
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* extensions. |
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*/ |
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protected function systemMimetypeExtensions() { |
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$out = array(); |
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if (file_exists($this->etcMimeTypes)) { |
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$file = fopen($this->etcMimeTypes, 'r'); |
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while (($line = fgets($file)) !== FALSE) { |
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$line = trim(preg_replace('/#.*/', '', $line)); |
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if (!$line) { |
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continue; |
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} |
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$parts = preg_split('/\s+/', $line); |
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if (count($parts) == 1) { |
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continue; |
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} |
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// A single part means a mimetype without extensions, which we ignore. |
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$type = array_shift($parts); |
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if (!isset($out[$type])) { |
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$out[$type] = array_shift($parts); |
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} |
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// We take the first ext from the line if many are present. |
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} |
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fclose($file); |
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} |
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return $out; |
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} |
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/** |
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* Gets a associative array of extensions and MIME types. |
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* |
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* Users the system mime.types file, or a local mime.types if one is found |
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* @see MIMEDetect::__constuctor() |
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* |
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* @return array |
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* An associative array where the keys are extensions and the values |
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* MIME types. |
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*/ |
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protected function systemExtensionMimetypes() { |
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$out = array(); |
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if (file_exists($this->etcMimeTypes)) { |
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$file = fopen($this->etcMimeTypes, 'r'); |
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while (($line = fgets($file)) !== FALSE) { |
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$line = trim(preg_replace('/#.*/', '', $line)); |
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if (!$line) { |
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continue; |
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} |
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$parts = preg_split('/\s+/', $line); |
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if (count($parts) == 1) { |
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continue; |
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} |
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// A single part means a mimetype without extensions, which we ignore. |
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$type = array_shift($parts); |
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foreach ($parts as $part) { |
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$out[$part] = $type; |
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} |
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} |
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fclose($file); |
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} |
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return $out; |
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} |
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}
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