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<?php
/**
* Module defining helper functions for detecting and dealing with mime types.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Defines a set of well known mime types
* This is used as a fallback to mime.types files.
* An extensive list of well known mime types is provided by
* the file mime.types in the includes directory.
*
* This list concatenated with mime.types is used to create a mime <-> ext
* map. Each line contains a mime type followed by a space separated list of
* extensions. If multiple extensions for a single mime type exist or if
* multiple mime types exist for a single extension then in most cases
* MediaWiki assumes that the first extension following the mime type is the
* canonical extension, and the first time a mime type appears for a certain
* extension is considered the canonical mime type.
*
* (Note that appending $wgMimeTypeFile to the end of MM_WELL_KNOWN_MIME_TYPES
* sucks because you can't redefine canonical types. This could be fixed by
* appending MM_WELL_KNOWN_MIME_TYPES behind $wgMimeTypeFile, but who knows
* what will break? In practice this probably isn't a problem anyway -- Bryan)
*/
define('MM_WELL_KNOWN_MIME_TYPES', <<<END_STRING
application/ogg ogx ogg ogm ogv oga spx
application/pdf pdf
application/vnd.oasis.opendocument.chart odc
application/vnd.oasis.opendocument.chart-template otc
application/vnd.oasis.opendocument.database odb
application/vnd.oasis.opendocument.formula odf
application/vnd.oasis.opendocument.formula-template otf
application/vnd.oasis.opendocument.graphics odg
application/vnd.oasis.opendocument.graphics-template otg
application/vnd.oasis.opendocument.image odi
application/vnd.oasis.opendocument.image-template oti
application/vnd.oasis.opendocument.presentation odp
application/vnd.oasis.opendocument.presentation-template otp
application/vnd.oasis.opendocument.spreadsheet ods
application/vnd.oasis.opendocument.spreadsheet-template ots
application/vnd.oasis.opendocument.text odt
application/vnd.oasis.opendocument.text-master otm
application/vnd.oasis.opendocument.text-template ott
application/vnd.oasis.opendocument.text-web oth
application/x-javascript js
application/x-shockwave-flash swf
audio/midi mid midi kar
audio/mpeg mpga mpa mp2 mp3
audio/x-aiff aif aiff aifc
audio/x-wav wav
audio/ogg oga spx ogg
image/x-bmp bmp
image/gif gif
image/jpeg jpeg jpg jpe
image/png png
image/svg+xml svg
image/svg svg
image/tiff tiff tif
image/vnd.djvu djvu
image/x.djvu djvu
image/x-djvu djvu
image/x-portable-pixmap ppm
image/x-xcf xcf
text/plain txt
text/html html htm
video/ogg ogv ogm ogg
video/mpeg mpg mpeg
END_STRING
);
/**
* Defines a set of well known mime info entries
* This is used as a fallback to mime.info files.
* An extensive list of well known mime types is provided by
* the file mime.info in the includes directory.
*/
define('MM_WELL_KNOWN_MIME_INFO', <<<END_STRING
application/pdf [OFFICE]
application/vnd.oasis.opendocument.chart [OFFICE]
application/vnd.oasis.opendocument.chart-template [OFFICE]
application/vnd.oasis.opendocument.database [OFFICE]
application/vnd.oasis.opendocument.formula [OFFICE]
application/vnd.oasis.opendocument.formula-template [OFFICE]
application/vnd.oasis.opendocument.graphics [OFFICE]
application/vnd.oasis.opendocument.graphics-template [OFFICE]
application/vnd.oasis.opendocument.image [OFFICE]
application/vnd.oasis.opendocument.image-template [OFFICE]
application/vnd.oasis.opendocument.presentation [OFFICE]
application/vnd.oasis.opendocument.presentation-template [OFFICE]
application/vnd.oasis.opendocument.spreadsheet [OFFICE]
application/vnd.oasis.opendocument.spreadsheet-template [OFFICE]
application/vnd.oasis.opendocument.text [OFFICE]
application/vnd.oasis.opendocument.text-template [OFFICE]
application/vnd.oasis.opendocument.text-master [OFFICE]
application/vnd.oasis.opendocument.text-web [OFFICE]
text/javascript application/x-javascript [EXECUTABLE]
application/x-shockwave-flash [MULTIMEDIA]
audio/midi [AUDIO]
audio/x-aiff [AUDIO]
audio/x-wav [AUDIO]
audio/mp3 audio/mpeg [AUDIO]
application/ogg audio/ogg video/ogg [MULTIMEDIA]
image/x-bmp image/x-ms-bmp image/bmp [BITMAP]
image/gif [BITMAP]
image/jpeg [BITMAP]
image/png [BITMAP]
image/svg+xml [DRAWING]
image/tiff [BITMAP]
image/vnd.djvu [BITMAP]
image/x-xcf [BITMAP]
image/x-portable-pixmap [BITMAP]
text/plain [TEXT]
text/html [TEXT]
video/ogg [VIDEO]
video/mpeg [VIDEO]
unknown/unknown application/octet-stream application/x-empty [UNKNOWN]
END_STRING
);
/**
* Implements functions related to mime types such as detection and mapping to
* file extension.
*
* Instances of this class are stateless, there only needs to be one global instance
* of MimeMagic. Please use MimeMagic::singleton() to get that instance.
*/
class MimeMagic {
/**
* Mapping of media types to arrays of mime types.
* This is used by findMediaType and getMediaType, respectively
*/
var $mMediaTypes = null;
/** Map of mime type aliases
*/
var $mMimeTypeAliases = null;
/** map of mime types to file extensions (as a space separated list)
*/
var $mMimeToExt = null;
/** map of file extensions types to mime types (as a space separated list)
*/
var $mExtToMime = null;
/** IEContentAnalyzer instance
*/
var $mIEAnalyzer;
/** The singleton instance
*/
private static $instance;
/** True if the fileinfo extension has been loaded
*/
private static $extensionLoaded = false;
/** Initializes the MimeMagic object. This is called by MimeMagic::singleton().
*
* This constructor parses the mime.types and mime.info files and build internal mappings.
*/
function __construct() {
/**
* --- load mime.types ---
*/
global $wgMimeTypeFile, $IP, $wgLoadFileinfoExtension;
$types = MM_WELL_KNOWN_MIME_TYPES;
if ( $wgMimeTypeFile == 'includes/mime.types' ) {
$wgMimeTypeFile = "$IP/$wgMimeTypeFile";
}
if ( $wgLoadFileinfoExtension && !self::$extensionLoaded ) {
self::$extensionLoaded = true;
wfDl( 'fileinfo' );
}
if ( $wgMimeTypeFile ) {
if ( is_file( $wgMimeTypeFile ) and is_readable( $wgMimeTypeFile ) ) {
wfDebug( __METHOD__ . ": loading mime types from $wgMimeTypeFile\n" );
$types .= "\n";
$types .= file_get_contents( $wgMimeTypeFile );
} else {
wfDebug( __METHOD__ . ": can't load mime types from $wgMimeTypeFile\n" );
}
} else {
wfDebug( __METHOD__ . ": no mime types file defined, using build-ins only.\n" );
}
$types = str_replace( array( "\r\n", "\n\r", "\n\n", "\r\r", "\r" ), "\n", $types );
$types = str_replace( "\t", " ", $types );
$this->mMimeToExt = array();
$this->mToMime = array();
$lines = explode( "\n", $types );
foreach ( $lines as $s ) {
$s = trim( $s );
if ( empty( $s ) ) {
continue;
}
if ( strpos( $s, '#' ) === 0 ) {
continue;
}
$s = strtolower( $s );
$i = strpos( $s, ' ' );
if ( $i === false ) {
continue;
}
$mime = substr( $s, 0, $i );
$ext = trim( substr( $s, $i+1 ) );
if ( empty( $ext ) ) {
continue;
}
if ( !empty( $this->mMimeToExt[$mime] ) ) {
$this->mMimeToExt[$mime] .= ' ' . $ext;
} else {
$this->mMimeToExt[$mime] = $ext;
}
$extensions = explode( ' ', $ext );
foreach ( $extensions as $e ) {
$e = trim( $e );
if ( empty( $e ) ) {
continue;
}
if ( !empty( $this->mExtToMime[$e] ) ) {
$this->mExtToMime[$e] .= ' ' . $mime;
} else {
$this->mExtToMime[$e] = $mime;
}
}
}
/**
* --- load mime.info ---
*/
global $wgMimeInfoFile;
if ( $wgMimeInfoFile == 'includes/mime.info' ) {
$wgMimeInfoFile = "$IP/$wgMimeInfoFile";
}
$info = MM_WELL_KNOWN_MIME_INFO;
if ( $wgMimeInfoFile ) {
if ( is_file( $wgMimeInfoFile ) and is_readable( $wgMimeInfoFile ) ) {
wfDebug( __METHOD__ . ": loading mime info from $wgMimeInfoFile\n" );
$info .= "\n";
$info .= file_get_contents( $wgMimeInfoFile );
} else {
wfDebug( __METHOD__ . ": can't load mime info from $wgMimeInfoFile\n" );
}
} else {
wfDebug( __METHOD__ . ": no mime info file defined, using build-ins only.\n" );
}
$info = str_replace( array( "\r\n", "\n\r", "\n\n", "\r\r", "\r" ), "\n", $info );
$info = str_replace( "\t", " ", $info );
$this->mMimeTypeAliases = array();
$this->mMediaTypes = array();
$lines = explode( "\n", $info );
foreach ( $lines as $s ) {
$s = trim( $s );
if ( empty( $s ) ) {
continue;
}
if ( strpos( $s, '#' ) === 0 ) {
continue;
}
$s = strtolower( $s );
$i = strpos( $s, ' ' );
if ( $i === false ) {
continue;
}
#print "processing MIME INFO line $s<br>";
$match = array();
if ( preg_match( '!\[\s*(\w+)\s*\]!', $s, $match ) ) {
$s = preg_replace( '!\[\s*(\w+)\s*\]!', '', $s );
$mtype = trim( strtoupper( $match[1] ) );
} else {
$mtype = MEDIATYPE_UNKNOWN;
}
$m = explode( ' ', $s );
if ( !isset( $this->mMediaTypes[$mtype] ) ) {
$this->mMediaTypes[$mtype] = array();
}
foreach ( $m as $mime ) {
$mime = trim( $mime );
if ( empty( $mime ) ) {
continue;
}
$this->mMediaTypes[$mtype][] = $mime;
}
if ( count( $m ) > 1 ) {
$main = $m[0];
for ( $i = 1; $i < count( $m ); $i += 1 ) {
$mime = $m[$i];
$this->mMimeTypeAliases[$mime] = $main;
}
}
}
}
/**
* Get an instance of this class
* @return MimeMagic
*/
public static function &singleton() {
if ( self::$instance === null ) {
self::$instance = new MimeMagic;
}
return self::$instance;
}
/**
* Returns a list of file extensions for a given mime type as a space
* separated string or null if the mime type was unrecognized. Resolves
* mime type aliases.
*
* @param $mime string
* @return string|null
*/
public function getExtensionsForType( $mime ) {
$mime = strtolower( $mime );
// Check the mime-to-ext map
if ( isset( $this->mMimeToExt[$mime] ) ) {
return $this->mMimeToExt[$mime];
}
// Resolve the mime type to the canonical type
if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
$mime = $this->mMimeTypeAliases[$mime];
if ( isset( $this->mMimeToExt[$mime] ) ) {
return $this->mMimeToExt[$mime];
}
}
return null;
}
/**
* Returns a list of mime types for a given file extension as a space
* separated string or null if the extension was unrecognized.
*
* @param $ext string
* @return string|null
*/
public function getTypesForExtension( $ext ) {
$ext = strtolower( $ext );
$r = isset( $this->mExtToMime[$ext] ) ? $this->mExtToMime[$ext] : null;
return $r;
}
/**
* Returns a single mime type for a given file extension or null if unknown.
* This is always the first type from the list returned by getTypesForExtension($ext).
*
* @param $ext string
* @return string|null
*/
public function guessTypesForExtension( $ext ) {
$m = $this->getTypesForExtension( $ext );
if ( is_null( $m ) ) {
return null;
}
// TODO: Check if this is needed; strtok( $m, ' ' ) should be sufficient
$m = trim( $m );
$m = preg_replace( '/\s.*$/', '', $m );
return $m;
}
/**
* Tests if the extension matches the given mime type. Returns true if a
* match was found, null if the mime type is unknown, and false if the
* mime type is known but no matches where found.
*
* @param $extension string
* @param $mime string
* @return bool|null
*/
public function isMatchingExtension( $extension, $mime ) {
$ext = $this->getExtensionsForType( $mime );
if ( !$ext ) {
return null; // Unknown mime type
}
$ext = explode( ' ', $ext );
$extension = strtolower( $extension );
return in_array( $extension, $ext );
}
/**
* Returns true if the mime type is known to represent an image format
* supported by the PHP GD library.
*
* @param $mime string
*
* @return bool
*/
public function isPHPImageType( $mime ) {
// As defined by imagegetsize and image_type_to_mime
static $types = array(
'image/gif', 'image/jpeg', 'image/png',
'image/x-bmp', 'image/xbm', 'image/tiff',
'image/jp2', 'image/jpeg2000', 'image/iff',
'image/xbm', 'image/x-xbitmap',
'image/vnd.wap.wbmp', 'image/vnd.xiff',
'image/x-photoshop',
'application/x-shockwave-flash',
);
return in_array( $mime, $types );
}
/**
* Returns true if the extension represents a type which can
* be reliably detected from its content. Use this to determine
* whether strict content checks should be applied to reject
* invalid uploads; if we can't identify the type we won't
* be able to say if it's invalid.
*
* @todo Be more accurate when using fancy mime detector plugins;
* right now this is the bare minimum getimagesize() list.
* @return bool
*/
function isRecognizableExtension( $extension ) {
static $types = array(
// Types recognized by getimagesize()
'gif', 'jpeg', 'jpg', 'png', 'swf', 'psd',
'bmp', 'tiff', 'tif', 'jpc', 'jp2',
'jpx', 'jb2', 'swc', 'iff', 'wbmp',
'xbm',
// Formats we recognize magic numbers for
'djvu', 'ogx', 'ogg', 'ogv', 'oga', 'spx',
'mid', 'pdf', 'wmf', 'xcf', 'webm', 'mkv', 'mka',
'webp',
// XML formats we sure hope we recognize reliably
'svg',
);
return in_array( strtolower( $extension ), $types );
}
/**
* Improves a mime type using the file extension. Some file formats are very generic,
* so their mime type is not very meaningful. A more useful mime type can be derived
* by looking at the file extension. Typically, this method would be called on the
* result of guessMimeType().
*
* Currently, this method does the following:
*
* If $mime is "unknown/unknown" and isRecognizableExtension( $ext ) returns false,
* return the result of guessTypesForExtension($ext).
*
* If $mime is "application/x-opc+zip" and isMatchingExtension( $ext, $mime )
* gives true, return the result of guessTypesForExtension($ext).
*
* @param string $mime the mime type, typically guessed from a file's content.
* @param string $ext the file extension, as taken from the file name
*
* @return string the mime type
*/
public function improveTypeFromExtension( $mime, $ext ) {
if ( $mime === 'unknown/unknown' ) {
if ( $this->isRecognizableExtension( $ext ) ) {
wfDebug( __METHOD__ . ': refusing to guess mime type for .' .
"$ext file, we should have recognized it\n" );
} else {
// Not something we can detect, so simply
// trust the file extension
$mime = $this->guessTypesForExtension( $ext );
}
}
elseif ( $mime === 'application/x-opc+zip' ) {
if ( $this->isMatchingExtension( $ext, $mime ) ) {
// A known file extension for an OPC file,
// find the proper mime type for that file extension
$mime = $this->guessTypesForExtension( $ext );
} else {
wfDebug( __METHOD__ . ": refusing to guess better type for $mime file, " .
".$ext is not a known OPC extension.\n" );
$mime = 'application/zip';
}
}
if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
$mime = $this->mMimeTypeAliases[$mime];
}
wfDebug( __METHOD__ . ": improved mime type for .$ext: $mime\n" );
return $mime;
}
/**
* Mime type detection. This uses detectMimeType to detect the mime type
* of the file, but applies additional checks to determine some well known
* file formats that may be missed or misinterpreted by the default mime
* detection (namely XML based formats like XHTML or SVG, as well as ZIP
* based formats like OPC/ODF files).
*
* @param string $file the file to check
* @param $ext Mixed: the file extension, or true (default) to extract it from the filename.
* Set it to false to ignore the extension. DEPRECATED! Set to false, use
* improveTypeFromExtension($mime, $ext) later to improve mime type.
*
* @return string the mime type of $file
*/
public function guessMimeType( $file, $ext = true ) {
if ( $ext ) { // TODO: make $ext default to false. Or better, remove it.
wfDebug( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " .
"Use improveTypeFromExtension(\$mime, \$ext) instead.\n" );
}
$mime = $this->doGuessMimeType( $file, $ext );
if( !$mime ) {
wfDebug( __METHOD__ . ": internal type detection failed for $file (.$ext)...\n" );
$mime = $this->detectMimeType( $file, $ext );
}
if ( isset( $this->mMimeTypeAliases[$mime] ) ) {
$mime = $this->mMimeTypeAliases[$mime];
}
wfDebug( __METHOD__ . ": guessed mime type of $file: $mime\n" );
return $mime;
}
/**
* Guess the mime type from the file contents.
*
* @param string $file
* @param mixed $ext
* @return bool|string
*/
private function doGuessMimeType( $file, $ext ) { // TODO: remove $ext param
// Read a chunk of the file
wfSuppressWarnings();
// @todo FIXME: Shouldn't this be rb?
$f = fopen( $file, 'rt' );
wfRestoreWarnings();
if( !$f ) {
return 'unknown/unknown';
}
$head = fread( $f, 1024 );
fseek( $f, -65558, SEEK_END );
$tail = fread( $f, 65558 ); // 65558 = maximum size of a zip EOCDR
fclose( $f );
wfDebug( __METHOD__ . ": analyzing head and tail of $file for magic numbers.\n" );
// Hardcode a few magic number checks...
$headers = array(
// Multimedia...
'MThd' => 'audio/midi',
'OggS' => 'application/ogg',
// Image formats...
// Note that WMF may have a bare header, no magic number.
"\x01\x00\x09\x00" => 'application/x-msmetafile', // Possibly prone to false positives?
"\xd7\xcd\xc6\x9a" => 'application/x-msmetafile',
'%PDF' => 'application/pdf',
'gimp xcf' => 'image/x-xcf',
// Some forbidden fruit...
'MZ' => 'application/octet-stream', // DOS/Windows executable
"\xca\xfe\xba\xbe" => 'application/octet-stream', // Mach-O binary
"\x7fELF" => 'application/octet-stream', // ELF binary
);
foreach ( $headers as $magic => $candidate ) {
if ( strncmp( $head, $magic, strlen( $magic ) ) == 0 ) {
wfDebug( __METHOD__ . ": magic header in $file recognized as $candidate\n" );
return $candidate;
}
}
/* Look for WebM and Matroska files */
if ( strncmp( $head, pack( "C4", 0x1a, 0x45, 0xdf, 0xa3 ), 4 ) == 0 ) {
$doctype = strpos( $head, "\x42\x82" );
if ( $doctype ) {
// Next byte is datasize, then data (sizes larger than 1 byte are very stupid muxers)
$data = substr( $head, $doctype+3, 8 );
if ( strncmp( $data, "matroska", 8 ) == 0 ) {
wfDebug( __METHOD__ . ": recognized file as video/x-matroska\n" );
return "video/x-matroska";
} elseif ( strncmp( $data, "webm", 4 ) == 0 ) {
wfDebug( __METHOD__ . ": recognized file as video/webm\n" );
return "video/webm";
}
}
wfDebug( __METHOD__ . ": unknown EBML file\n" );
return "unknown/unknown";
}
/* Look for WebP */
if ( strncmp( $head, "RIFF", 4 ) == 0 && strncmp( substr( $head, 8, 8), "WEBPVP8 ", 8 ) == 0 ) {
wfDebug( __METHOD__ . ": recognized file as image/webp\n" );
return "image/webp";
}
/**
* Look for PHP. Check for this before HTML/XML... Warning: this is a
* heuristic, and won't match a file with a lot of non-PHP before. It
* will also match text files which could be PHP. :)
*
* @todo FIXME: For this reason, the check is probably useless -- an attacker
* could almost certainly just pad the file with a lot of nonsense to
* circumvent the check in any case where it would be a security
* problem. On the other hand, it causes harmful false positives (bug
* 16583). The heuristic has been cut down to exclude three-character
* strings like "<? ", but should it be axed completely?
*/
if ( ( strpos( $head, '<?php' ) !== false ) ||
( strpos( $head, "<\x00?\x00p\x00h\x00p" ) !== false ) ||
( strpos( $head, "<\x00?\x00 " ) !== false ) ||
( strpos( $head, "<\x00?\x00\n" ) !== false ) ||
( strpos( $head, "<\x00?\x00\t" ) !== false ) ||
( strpos( $head, "<\x00?\x00=" ) !== false ) ) {
wfDebug( __METHOD__ . ": recognized $file as application/x-php\n" );
return 'application/x-php';
}
/**
* look for XML formats (XHTML and SVG)
*/
$xml = new XmlTypeCheck( $file );
if ( $xml->wellFormed ) {
global $wgXMLMimeTypes;
if ( isset( $wgXMLMimeTypes[$xml->getRootElement()] ) ) {
return $wgXMLMimeTypes[$xml->getRootElement()];
} else {
return 'application/xml';
}
}
/**
* look for shell scripts
*/
$script_type = null;
# detect by shebang
if ( substr( $head, 0, 2) == "#!" ) {
$script_type = "ASCII";
} elseif ( substr( $head, 0, 5) == "\xef\xbb\xbf#!" ) {
$script_type = "UTF-8";
} elseif ( substr( $head, 0, 7) == "\xfe\xff\x00#\x00!" ) {
$script_type = "UTF-16BE";
} elseif ( substr( $head, 0, 7 ) == "\xff\xfe#\x00!" ) {
$script_type = "UTF-16LE";
}
if ( $script_type ) {
if ( $script_type !== "UTF-8" && $script_type !== "ASCII" ) {
// Quick and dirty fold down to ASCII!
$pack = array( 'UTF-16BE' => 'n*', 'UTF-16LE' => 'v*' );
$chars = unpack( $pack[$script_type], substr( $head, 2 ) );
$head = '';
foreach( $chars as $codepoint ) {
if( $codepoint < 128 ) {
$head .= chr( $codepoint );
} else {
$head .= '?';
}
}
}
$match = array();
if ( preg_match( '%/?([^\s]+/)(\w+)%', $head, $match ) ) {
$mime = "application/x-{$match[2]}";
wfDebug( __METHOD__ . ": shell script recognized as $mime\n" );
return $mime;
}
}
// Check for ZIP variants (before getimagesize)
if ( strpos( $tail, "PK\x05\x06" ) !== false ) {
wfDebug( __METHOD__ . ": ZIP header present in $file\n" );
return $this->detectZipType( $head, $tail, $ext );
}
wfSuppressWarnings();
$gis = getimagesize( $file );
wfRestoreWarnings();
if( $gis && isset( $gis['mime'] ) ) {
$mime = $gis['mime'];
wfDebug( __METHOD__ . ": getimagesize detected $file as $mime\n" );
return $mime;
}
// Also test DjVu
$deja = new DjVuImage( $file );
if( $deja->isValid() ) {
wfDebug( __METHOD__ . ": detected $file as image/vnd.djvu\n" );
return 'image/vnd.djvu';
}
return false;
}
/**
* Detect application-specific file type of a given ZIP file from its
* header data. Currently works for OpenDocument and OpenXML types...
* If can't tell, returns 'application/zip'.
*
* @param string $header some reasonably-sized chunk of file header
* @param $tail String: the tail of the file
* @param $ext Mixed: the file extension, or true to extract it from the filename.
* Set it to false (default) to ignore the extension. DEPRECATED! Set to false,
* use improveTypeFromExtension($mime, $ext) later to improve mime type.
*
* @return string
*/
function detectZipType( $header, $tail = null, $ext = false ) {
if( $ext ) { # TODO: remove $ext param
wfDebug( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. " .
"Use improveTypeFromExtension(\$mime, \$ext) instead.\n" );
}
$mime = 'application/zip';
$opendocTypes = array(
'chart-template',
'chart',
'formula-template',
'formula',
'graphics-template',
'graphics',
'image-template',
'image',
'presentation-template',
'presentation',
'spreadsheet-template',
'spreadsheet',
'text-template',
'text-master',
'text-web',
'text' );
// http://lists.oasis-open.org/archives/office/200505/msg00006.html
$types = '(?:' . implode( '|', $opendocTypes ) . ')';
$opendocRegex = "/^mimetype(application\/vnd\.oasis\.opendocument\.$types)/";
$openxmlRegex = "/^\[Content_Types\].xml/";
if ( preg_match( $opendocRegex, substr( $header, 30 ), $matches ) ) {
$mime = $matches[1];
wfDebug( __METHOD__ . ": detected $mime from ZIP archive\n" );
} elseif ( preg_match( $openxmlRegex, substr( $header, 30 ) ) ) {
$mime = "application/x-opc+zip";
# TODO: remove the block below, as soon as improveTypeFromExtension is used everywhere
if ( $ext !== true && $ext !== false ) {
/** This is the mode used by getPropsFromPath
* These mime's are stored in the database, where we don't really want
* x-opc+zip, because we use it only for internal purposes
*/
if ( $this->isMatchingExtension( $ext, $mime) ) {
/* A known file extension for an OPC file,
* find the proper mime type for that file extension
*/
$mime = $this->guessTypesForExtension( $ext );
} else {
$mime = "application/zip";
}
}
wfDebug( __METHOD__ . ": detected an Open Packaging Conventions archive: $mime\n" );
} elseif ( substr( $header, 0, 8 ) == "\xd0\xcf\x11\xe0\xa1\xb1\x1a\xe1" &&
($headerpos = strpos( $tail, "PK\x03\x04" ) ) !== false &&
preg_match( $openxmlRegex, substr( $tail, $headerpos + 30 ) ) ) {
if ( substr( $header, 512, 4) == "\xEC\xA5\xC1\x00" ) {
$mime = "application/msword";
}
switch( substr( $header, 512, 6) ) {
case "\xEC\xA5\xC1\x00\x0E\x00":
case "\xEC\xA5\xC1\x00\x1C\x00":
case "\xEC\xA5\xC1\x00\x43\x00":
$mime = "application/vnd.ms-powerpoint";
break;
case "\xFD\xFF\xFF\xFF\x10\x00":
case "\xFD\xFF\xFF\xFF\x1F\x00":
case "\xFD\xFF\xFF\xFF\x22\x00":
case "\xFD\xFF\xFF\xFF\x23\x00":
case "\xFD\xFF\xFF\xFF\x28\x00":
case "\xFD\xFF\xFF\xFF\x29\x00":
case "\xFD\xFF\xFF\xFF\x10\x02":
case "\xFD\xFF\xFF\xFF\x1F\x02":
case "\xFD\xFF\xFF\xFF\x22\x02":
case "\xFD\xFF\xFF\xFF\x23\x02":
case "\xFD\xFF\xFF\xFF\x28\x02":
case "\xFD\xFF\xFF\xFF\x29\x02":
$mime = "application/vnd.msexcel";
break;
}
wfDebug( __METHOD__ . ": detected a MS Office document with OPC trailer\n" );
} else {
wfDebug( __METHOD__ . ": unable to identify type of ZIP archive\n" );
}
return $mime;
}
/**
* Internal mime type detection. Detection is done using an external
* program, if $wgMimeDetectorCommand is set. Otherwise, the fileinfo
* extension and mime_content_type are tried (in this order), if they
* are available. If the detections fails and $ext is not false, the mime
* type is guessed from the file extension, using guessTypesForExtension.
*
* If the mime type is still unknown, getimagesize is used to detect the
* mime type if the file is an image. If no mime type can be determined,
* this function returns 'unknown/unknown'.
*
* @param string $file the file to check
* @param $ext Mixed: the file extension, or true (default) to extract it from the filename.
* Set it to false to ignore the extension. DEPRECATED! Set to false, use
* improveTypeFromExtension($mime, $ext) later to improve mime type.
*
* @return string the mime type of $file
*/
private function detectMimeType( $file, $ext = true ) {
global $wgMimeDetectorCommand;
if ( $ext ) { # TODO: make $ext default to false. Or better, remove it.
wfDebug( __METHOD__ . ": WARNING: use of the \$ext parameter is deprecated. Use improveTypeFromExtension(\$mime, \$ext) instead.\n" );
}
$m = null;
if ( $wgMimeDetectorCommand ) {
// @todo FIXME: Use wfShellExec
$fn = wfEscapeShellArg( $file );
$m = `$wgMimeDetectorCommand $fn`;
} elseif ( function_exists( "finfo_open" ) && function_exists( "finfo_file" ) ) {
# This required the fileinfo extension by PECL,
# see http://pecl.php.net/package/fileinfo
# This must be compiled into PHP
#
# finfo is the official replacement for the deprecated
# mime_content_type function, see below.
#
# If you may need to load the fileinfo extension at runtime, set
# $wgLoadFileinfoExtension in LocalSettings.php
$mime_magic_resource = finfo_open( FILEINFO_MIME ); /* return mime type ala mimetype extension */
if ( $mime_magic_resource ) {
$m = finfo_file( $mime_magic_resource, $file );
finfo_close( $mime_magic_resource );
} else {
wfDebug( __METHOD__ . ": finfo_open failed on ".FILEINFO_MIME."!\n" );
}
} elseif ( function_exists( "mime_content_type" ) ) {
# NOTE: this function is available since PHP 4.3.0, but only if
# PHP was compiled with --with-mime-magic or, before 4.3.2, with --enable-mime-magic.
#
# On Windows, you must set mime_magic.magicfile in php.ini to point to the mime.magic file bundled with PHP;
# sometimes, this may even be needed under linus/unix.
#
# Also note that this has been DEPRECATED in favor of the fileinfo extension by PECL, see above.
# see http://www.php.net/manual/en/ref.mime-magic.php for details.
$m = mime_content_type( $file );
} else {
wfDebug( __METHOD__ . ": no magic mime detector found!\n" );
}
if ( $m ) {
# normalize
$m = preg_replace( '![;, ].*$!', '', $m ); #strip charset, etc
$m = trim( $m );
$m = strtolower( $m );
if ( strpos( $m, 'unknown' ) !== false ) {
$m = null;
} else {
wfDebug( __METHOD__ . ": magic mime type of $file: $m\n" );
return $m;
}
}
// If desired, look at extension as a fallback.
if ( $ext === true ) {
$i = strrpos( $file, '.' );
$ext = strtolower( $i ? substr( $file, $i + 1 ) : '' );
}
if ( $ext ) {
if( $this->isRecognizableExtension( $ext ) ) {
wfDebug( __METHOD__ . ": refusing to guess mime type for .$ext file, we should have recognized it\n" );
} else {
$m = $this->guessTypesForExtension( $ext );
if ( $m ) {
wfDebug( __METHOD__ . ": extension mime type of $file: $m\n" );
return $m;
}
}
}
// Unknown type
wfDebug( __METHOD__ . ": failed to guess mime type for $file!\n" );
return 'unknown/unknown';
}
/**
* Determine the media type code for a file, using its mime type, name and
* possibly its contents.
*
* This function relies on the findMediaType(), mapping extensions and mime
* types to media types.
*
* @todo analyse file if need be
* @todo look at multiple extension, separately and together.
*
* @param string $path full path to the image file, in case we have to look at the contents
* (if null, only the mime type is used to determine the media type code).
* @param string $mime mime type. If null it will be guessed using guessMimeType.
*
* @return (int?string?) a value to be used with the MEDIATYPE_xxx constants.
*/
function getMediaType( $path = null, $mime = null ) {
if( !$mime && !$path ) {
return MEDIATYPE_UNKNOWN;
}
// If mime type is unknown, guess it
if( !$mime ) {
$mime = $this->guessMimeType( $path, false );
}
// Special code for ogg - detect if it's video (theora),
// else label it as sound.
if ( $mime == 'application/ogg' && file_exists( $path ) ) {
// Read a chunk of the file
$f = fopen( $path, "rt" );
if ( !$f ) return MEDIATYPE_UNKNOWN;
$head = fread( $f, 256 );
fclose( $f );
$head = strtolower( $head );
// This is an UGLY HACK, file should be parsed correctly
if ( strpos( $head, 'theora' ) !== false ) return MEDIATYPE_VIDEO;
elseif ( strpos( $head, 'vorbis' ) !== false ) return MEDIATYPE_AUDIO;
elseif ( strpos( $head, 'flac' ) !== false ) return MEDIATYPE_AUDIO;
elseif ( strpos( $head, 'speex' ) !== false ) return MEDIATYPE_AUDIO;
else return MEDIATYPE_MULTIMEDIA;
}
// Check for entry for full mime type
if( $mime ) {
$type = $this->findMediaType( $mime );
if ( $type !== MEDIATYPE_UNKNOWN ) {
return $type;
}
}
// Check for entry for file extension
if ( $path ) {
$i = strrpos( $path, '.' );
$e = strtolower( $i ? substr( $path, $i + 1 ) : '' );
// TODO: look at multi-extension if this fails, parse from full path
$type = $this->findMediaType( '.' . $e );
if ( $type !== MEDIATYPE_UNKNOWN ) {
return $type;
}
}
// Check major mime type
if ( $mime ) {
$i = strpos( $mime, '/' );
if ( $i !== false ) {
$major = substr( $mime, 0, $i );
$type = $this->findMediaType( $major );
if ( $type !== MEDIATYPE_UNKNOWN ) {
return $type;
}
}
}
if( !$type ) {
$type = MEDIATYPE_UNKNOWN;
}
return $type;
}
/**
* Returns a media code matching the given mime type or file extension.
* File extensions are represented by a string starting with a dot (.) to
* distinguish them from mime types.
*
* This function relies on the mapping defined by $this->mMediaTypes
* @access private
* @return int|string
*/
function findMediaType( $extMime ) {
if ( strpos( $extMime, '.' ) === 0 ) {
// If it's an extension, look up the mime types
$m = $this->getTypesForExtension( substr( $extMime, 1 ) );
if ( !$m ) {
return MEDIATYPE_UNKNOWN;
}
$m = explode( ' ', $m );
} else {
// Normalize mime type
if ( isset( $this->mMimeTypeAliases[$extMime] ) ) {
$extMime = $this->mMimeTypeAliases[$extMime];
}
$m = array( $extMime );
}
foreach ( $m as $mime ) {
foreach ( $this->mMediaTypes as $type => $codes ) {
if ( in_array( $mime, $codes, true ) ) {
return $type;
}
}
}
return MEDIATYPE_UNKNOWN;
}
/**
* Get the MIME types that various versions of Internet Explorer would
* detect from a chunk of the content.
*
* @param string $fileName the file name (unused at present)
* @param string $chunk the first 256 bytes of the file
* @param string $proposed the MIME type proposed by the server
* @return Array
*/
public function getIEMimeTypes( $fileName, $chunk, $proposed ) {
$ca = $this->getIEContentAnalyzer();
return $ca->getRealMimesFromData( $fileName, $chunk, $proposed );
}
/**
* Get a cached instance of IEContentAnalyzer
*
* @return IEContentAnalyzer
*/
protected function getIEContentAnalyzer() {
if ( is_null( $this->mIEAnalyzer ) ) {
$this->mIEAnalyzer = new IEContentAnalyzer;
}
return $this->mIEAnalyzer;
}
}