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Drupal modules for browsing and managing Fedora-based digital repositories.
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islandora/includes/mime_detect.inc

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<?php
/**
* @file
* Class for determining MIME types and file extensions.
*
* This class inspired by Chris Jean's work, here:
* http://chrisjean.com/2009/02/14/generating-mime-type-in-php-is-not-magic/
*
* It does some MIME trickery, inspired by the need to to deal with Openoffice
* and MS Office 2007 file formats -- which are often mis-interpreted by
* mime-magic, fileinfo, and the *nix `file` command.
*
* In Drupal 6, we also make use of file_get_mimetype. See:
* http://api.drupal.org/api/function/file_get_mimetype/6
* ... however this only provides a uni-directional lookup (ext->mime).
* While I don't have a specific use case for a mime->extension lookup, I think
* it's good to have in here.
*
* Drupal 7 will have better mime handlers. See:
* http://api.drupal.org/api/function/file_default_mimetype_mapping/7
*/
class MimeDetect {
protected $protectedMimeTypes = array(
/*
* This is a shortlist of mimetypes which should catch most
* mimetype<-->extension lookups in the context of Islandora collections.
*
* It has been cut from a much longer list.
*
* Two types of mimetypes should be put in this list:
* 1) Special emerging formats which may not yet be expressed in the system
* mime.types file.
* 2) Heavily used mimetypes of particular importance to the Islandora
* project, as lookups against this list will be quicker and less
* resource intensive than other methods.
*
* Lookups are first checked against this short list. If no results are
* found, then the lookup function may move on to check other sources,
* namely the system's mime.types file.
*
* In most cases though, this short list should suffice.
*
* If modifying this list, please note that for promiscuous mimetypes
* (those which map to multiple extensions, such as text/plain)
* The function get_extension will always return the *LAST* extension in
* this list, so you should put your preferred extension *LAST*.
*
* e.g...
* "jpeg" => "image/jpeg",
* "jpe" => "image/jpeg",
* "jpg" => "image/jpeg",
*
* $this->get_extension('image/jpeg') will always return 'jpg'.
*
*/
// Openoffice:
'odb' => 'application/vnd.oasis.opendocument.database',
'odc' => 'application/vnd.oasis.opendocument.chart',
'odf' => 'application/vnd.oasis.opendocument.formula',
'odg' => 'application/vnd.oasis.opendocument.graphics',
'odi' => 'application/vnd.oasis.opendocument.image',
'odm' => 'application/vnd.oasis.opendocument.text-master',
'odp' => 'application/vnd.oasis.opendocument.presentation',
'ods' => 'application/vnd.oasis.opendocument.spreadsheet',
'odt' => 'application/vnd.oasis.opendocument.text',
'otg' => 'application/vnd.oasis.opendocument.graphics-template',
'oth' => 'application/vnd.oasis.opendocument.text-web',
'otp' => 'application/vnd.oasis.opendocument.presentation-template',
'ots' => 'application/vnd.oasis.opendocument.spreadsheet-template',
'ott' => 'application/vnd.oasis.opendocument.text-template',
// Staroffice:
'stc' => 'application/vnd.sun.xml.calc.template',
'std' => 'application/vnd.sun.xml.draw.template',
'sti' => 'application/vnd.sun.xml.impress.template',
'stw' => 'application/vnd.sun.xml.writer.template',
'sxc' => 'application/vnd.sun.xml.calc',
'sxd' => 'application/vnd.sun.xml.draw',
'sxg' => 'application/vnd.sun.xml.writer.global',
'sxi' => 'application/vnd.sun.xml.impress',
'sxm' => 'application/vnd.sun.xml.math',
'sxw' => 'application/vnd.sun.xml.writer',
// K-office:
'kil' => 'application/x-killustrator',
'kpt' => 'application/x-kpresenter',
'kpr' => 'application/x-kpresenter',
'ksp' => 'application/x-kspread',
'kwt' => 'application/x-kword',
'kwd' => 'application/x-kword',
// Ms office 97:
'doc' => 'application/msword',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',
// Office2007:
'docx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
'docm' => 'application/vnd.ms-word.document.macroEnabled.12',
'dotx' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
'dotm' => 'application/vnd.ms-word.template.macroEnabled.12',
'xlsx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
'xlsm' => 'application/vnd.ms-excel.sheet.macroEnabled.12',
'xltx' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
'xltm' => 'application/vnd.ms-excel.template.macroEnabled.12',
'xlsb' => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
'xlam' => 'application/vnd.ms-excel.addin.macroEnabled.12',
'pptx' => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
'pptm' => 'application/vnd.ms-powerpoint.presentation.macroEnabled.12',
'ppsx' => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
'ppsm' => 'application/vnd.ms-powerpoint.slideshow.macroEnabled.12',
'potx' => 'application/vnd.openxmlformats-officedocument.presentationml.template',
'potm' => 'application/vnd.ms-powerpoint.template.macroEnabled.12',
'ppam' => 'application/vnd.ms-powerpoint.addin.macroEnabled.12',
'sldx' => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
'sldm' => 'application/vnd.ms-powerpoint.slide.macroEnabled.12',
// Wordperfect (who cares?):
'wpd' => 'application/wordperfect',
// Common and generic containers:
'pdf' => 'application/pdf',
'eps' => 'application/postscript',
'ps' => 'application/postscript',
'rtf' => 'text/rtf',
'rtx' => 'text/richtext',
'latex' => 'application/x-latex',
'tex' => 'application/x-tex',
'texi' => 'application/x-texinfo',
'texinfo' => 'application/x-texinfo',
// *ml:
'css' => 'text/css',
'htm' => 'text/html',
'html' => 'text/html',
'wbxml' => 'application/vnd.wap.wbxml',
'xht' => 'application/xhtml+xml',
'xhtml' => 'application/xhtml+xml',
'xsl' => 'text/xml',
'xml' => 'text/xml',
'csv' => 'text/csv',
'tsv' => 'text/tab-separated-values',
'txt' => 'text/plain',
// images:
"bmp" => "image/bmp",
'dng' => 'image/x-adobe-dng',
"gif" => "image/gif",
"ief" => "image/ief",
"jpeg" => "image/jpeg",
"jpe" => "image/jpeg",
"jpg" => "image/jpg",
"jp2" => "image/jp2",
"png" => "image/png",
"tiff" => "image/tiff",
"tif" => "image/tiff",
"djvu" => "image/vnd.djvu",
"djv" => "image/vnd.djvu",
"wbmp" => "image/vnd.wap.wbmp",
"ras" => "image/x-cmu-raster",
"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",
"xpm" => "image/x-xpixmap",
"xwd" => "image/x-windowdump",
// videos:
"mkv" => "video/x-matroska",
"mpeg" => "video/mpeg",
"mpe" => "video/mpeg",
"mpg" => "video/mpeg",
"m4v" => "video/mp4",
"mp4" => "video/mp4",
"ogv" => "video/ogg",
"qt" => "video/quicktime",
"mov" => "video/quicktime",
"mxu" => "video/vnd.mpegurl",
"avi" => "video/x-msvideo",
"movie" => "video/x-sgi-movie",
"flv" => "video/x-flv",
"swf" => "application/x-shockwave-flash",
// Audio:
"mp3" => "audio/mpeg",
"mp4a" => "audio/mp4",
"m4a" => "audio/mp4",
"oga" => "audio/ogg",
"ogg" => "audio/ogg",
"flac" => "audio/x-flac",
"wav" => "audio/vnd.wave",
// Chemical:
// MDL Molfile.
"mol" => "chemical/x-mdl-molfile",
// XYZ format.
"xyz" => "chemical/x-xyz",
// PDB.
"pdb" => "chemical/x-pdb",
// ChemDraw 3D.
"c3d" => "chemical/x-chem3d",
// ChemDraw file.
"chm" => "chemical/x-chemdraw",
// Crystallographic Information File.
"cif" => "chemical/x-cif",
// Chemical Markup Language.
"cml" => "chemical/x-cml",
// GAMESS Input.
"inp" => "chemical/x-gamess-input",
// GAMESS Output.
"gam" => "chemical/x-gamess-input",
// General output file.
"out" => "application/octet-stream",
// Gaussian Cube.
"cub" => "chemical/x-gaussian-cube",
// Gaussian 98/03 Cartesian Input.
"gau" => "chemical/x-gaussian-input",
// Corel Multimedia Manager v6 Album.
"gal" => "application/octet-stream",
// JCAMP Spectroscopic Data Exchange Format.
"jdx" => "chemical/x-jcamp-dx",
// OpenDX Grid.
"dx" => "chemical/x-jcamp-dx",
// MOPAC Cartesian.
"mop" => "chemical/x-mopac-input",
// General Input File.
"in" => "application/octet-stream",
// Compressed formats:
// (note: http://svn.cleancode.org/svn/email/trunk/mime.types)
"tgz" => "application/x-gzip",
"gz" => "application/x-gzip",
"tar" => "application/x-tar",
"gtar" => "application/x-gtar",
"zip" => "application/x-zip",
// others:
'bin' => 'application/octet-stream',
);
protected $protectedFileExtensions;
protected $extensionExceptions = array(
// XXX: Deprecated... Only here due to old 'tif' => 'image/tif' mapping...
// The correct MIMEtype is 'image/tiff'.
'image/tif' => 'tif',
);
protected $systemTypes;
protected $systemExts;
protected $etcMimeTypes = '/etc/mime.types';
/**
* Construtor.
*/
public function __construct() {
// Populate the reverse shortlist:
$this->protectedFileExtensions = array_flip($this->protectedMimeTypes);
$this->protectedFileExtensions += $this->extensionExceptions;
// Pick up a local mime.types file if it is available.
if (is_readable('mime.types')) {
$this->etcMimeTypes = 'mime.types';
}
}
/**
* Gets MIME type associated with the give file's extension.
*
* @param string $filename
* The filename
* @param bool $debug
* Returns a debug array.
*
* @return mixed
* string or an array
*/
public function getMimetype($filename, $debug = FALSE) {
$file_name_and_extension = explode('.', $filename);
$ext = drupal_strtolower(array_pop($file_name_and_extension));
if (!empty($this->protectedMimeTypes[$ext])) {
if (TRUE === $debug) {
return array('mime_type' => $this->protectedMimeTypes[$ext], 'method' => 'from_array');
}
return $this->protectedMimeTypes[$ext];
}
if (function_exists('file_get_mimetype')) {
$drupal_mimetype = file_get_mimetype($filename);
if ('application/octet-stream' != $drupal_mimetype) {
if (TRUE == $debug) {
return array('mime_type' => $drupal_mimetype, 'method' => 'file_get_mimetype');
}
return $drupal_mimetype;
}
}
if (!isset($this->systemTypes)) {
$this->systemTypes = $this->systemExtensionMimetypes();
}
if (isset($this->systemTypes[$ext])) {
if (TRUE == $debug) {
return array('mime_type' => $this->systemTypes[$ext], 'method' => 'mime.types');
}
return $this->systemTypes[$ext];
}
if (TRUE === $debug) {
return array('mime_type' => 'application/octet-stream', 'method' => 'last_resort');
}
return 'application/octet-stream';
}
/**
* Gets one valid file extension for a given MIME type.
*
* @param string $mime_type
* The MIME type.
* @param bool $debug
* Generated debug information?
*
* @return string
* The file extensions associated with the given MIME type.
*/
public function getExtension($mime_type, $debug = FALSE) {
if (!empty($this->protectedFileExtensions[$mime_type])) {
if (TRUE == $debug) {
return array('extension' => $this->protectedFileExtensions[$mime_type], 'method' => 'from_array');
}
return $this->protectedFileExtensions[$mime_type];
}
if (!isset($this->systemExts)) {
$this->systemExts = $this->systemMimetypeExtensions();
}
if (isset($this->systemExts[$mime_type])) {
if (TRUE == $debug) {
return array('extension' => $this->systemExts[$mime_type], 'method' => 'mime.types');
}
return $this->systemExts[$mime_type];
}
if (TRUE == $debug) {
return array('extension' => 'bin', 'method' => 'last_resort');
}
return 'bin';
}
/**
* Gets an associative array of MIME type and extension associations.
*
* Users the system mime.types file, or a local mime.types if one is found
* @see MIMEDetect::__constuctor()
*
* @return array
* An associative array where the keys are MIME types and the values
* extensions.
*/
protected function systemMimetypeExtensions() {
$out = array();
if (file_exists($this->etcMimeTypes)) {
$file = fopen($this->etcMimeTypes, 'r');
while (($line = fgets($file)) !== FALSE) {
$line = trim(preg_replace('/#.*/', '', $line));
if (!$line) {
continue;
}
$parts = preg_split('/\s+/', $line);
if (count($parts) == 1) {
continue;
}
// A single part means a mimetype without extensions, which we ignore.
$type = array_shift($parts);
if (!isset($out[$type])) {
$out[$type] = array_shift($parts);
}
// We take the first ext from the line if many are present.
}
fclose($file);
}
return $out;
}
/**
* Gets a associative array of extensions and MIME types.
*
* Users the system mime.types file, or a local mime.types if one is found
* @see MIMEDetect::__constuctor()
*
* @return array
* An associative array where the keys are extensions and the values
* MIME types.
*/
protected function systemExtensionMimetypes() {
$out = array();
if (file_exists($this->etcMimeTypes)) {
$file = fopen($this->etcMimeTypes, 'r');
while (($line = fgets($file)) !== FALSE) {
$line = trim(preg_replace('/#.*/', '', $line));
if (!$line) {
continue;
}
$parts = preg_split('/\s+/', $line);
if (count($parts) == 1) {
continue;
}
// A single part means a mimetype without extensions, which we ignore.
$type = array_shift($parts);
foreach ($parts as $part) {
$out[$part] = $type;
}
}
fclose($file);
}
return $out;
}
/**
* Gets MIME type array.
*
* @return array
* Returns associative array with exts and mimetypes.
*/
public function getMimeTypes() {
return $this->protectedMimeTypes;
}
/**
* Get all valid extensions for this MIME type.
*
* @param string $mimetype
* The MIME type we are searching for.
*
* @return array
* An array of valid extensions for this MIME type.
*/
public function getValidExtensions($mimetype) {
$filter = function ($mime) use ($mimetype) {
return $mime == $mimetype;
};
return array_keys(array_filter($this->protectedMimeTypes, $filter));
}
}