228f96a905
with validity checking and size detection. No inline thumbnailing yet, but could be added in the future.
695 lines
20 KiB
PHP
695 lines
20 KiB
PHP
<?php
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/** Module defining helper functions for detecting and dealing with mime types.
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*
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* @package MediaWiki
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*/
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/** Defines a set of well known mime types
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* This is used as a fallback to mime.types files.
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* An extensive list of well known mime types is provided by
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* the file mime.types in the includes directory.
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*/
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define('MM_WELL_KNOWN_MIME_TYPES',<<<END_STRING
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application/ogg ogg ogm
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application/pdf pdf
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application/x-javascript js
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application/x-shockwave-flash swf
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audio/midi mid midi kar
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audio/mpeg mpga mpa mp2 mp3
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audio/x-aiff aif aiff aifc
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audio/x-wav wav
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audio/ogg ogg
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image/x-bmp bmp
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image/gif gif
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image/jpeg jpeg jpg jpe
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image/png png
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image/svg+xml svg
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image/tiff tiff tif
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image/vnd.djvu djvu
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text/plain txt
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text/html html htm
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video/ogg ogm ogg
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video/mpeg mpg mpeg
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END_STRING
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);
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/** Defines a set of well known mime info entries
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* This is used as a fallback to mime.info files.
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* An extensive list of well known mime types is provided by
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* the file mime.info in the includes directory.
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*/
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define('MM_WELL_KNOWN_MIME_INFO', <<<END_STRING
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application/pdf [OFFICE]
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text/javascript application/x-javascript [EXECUTABLE]
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application/x-shockwave-flash [MULTIMEDIA]
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audio/midi [AUDIO]
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audio/x-aiff [AUDIO]
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audio/x-wav [AUDIO]
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audio/mp3 audio/mpeg [AUDIO]
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application/ogg audio/ogg video/ogg [MULTIMEDIA]
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image/x-bmp image/bmp [BITMAP]
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image/gif [BITMAP]
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image/jpeg [BITMAP]
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image/png [BITMAP]
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image/svg image/svg+xml [DRAWING]
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image/tiff [BITMAP]
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image/vnd.djvu [BITMAP]
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text/plain [TEXT]
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text/html [TEXT]
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video/ogg [VIDEO]
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video/mpeg [VIDEO]
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unknown/unknown application/octet-stream application/x-empty [UNKNOWN]
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END_STRING
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);
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#note: because this file is possibly included by a function,
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#we need to access the global scope explicitely!
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global $wgLoadFileinfoExtension;
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if ($wgLoadFileinfoExtension) {
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if(!extension_loaded('fileinfo')) dl('fileinfo.' . PHP_SHLIB_SUFFIX);
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}
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/** Implements functions related to mime types such as detection and mapping to
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* file extension,
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*
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* Instances of this class are stateles, there only needs to be one global instance
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* of MimeMagic. Please use wfGetMimeMagic to get that instance.
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* @package MediaWiki
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*/
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class MimeMagic {
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/**
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* Mapping of media types to arrays of mime types.
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* This is used by findMediaType and getMediaType, respectively
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*/
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var $mMediaTypes= NULL;
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/** Map of mime type aliases
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*/
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var $mMimeTypeAliases= NULL;
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/** map of mime types to file extensions (as a space seprarated list)
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*/
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var $mMimeToExt= NULL;
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/** map of file extensions types to mime types (as a space seprarated list)
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*/
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var $mExtToMime= NULL;
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/** Initializes the MimeMagic object. This is called by wfGetMimeMagic when instantiation
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* the global MimeMagic singleton object.
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*
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* This constructor parses the mime.types and mime.info files and build internal mappings.
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*/
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function MimeMagic() {
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/*
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* --- load mime.types ---
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*/
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global $wgMimeTypeFile;
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$types= MM_WELL_KNOWN_MIME_TYPES;
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if ($wgMimeTypeFile) {
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if (is_file($wgMimeTypeFile) and is_readable($wgMimeTypeFile)) {
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wfDebug("MimeMagic::MimeMagic: loading mime types from $wgMimeTypeFile\n");
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$types.= "\n";
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$types.= file_get_contents($wgMimeTypeFile);
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}
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else wfDebug("MimeMagic::MimeMagic: can't load mime types from $wgMimeTypeFile\n");
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}
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else wfDebug("MimeMagic::MimeMagic: no mime types file defined, using build-ins only.\n");
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$types= str_replace(array("\r\n","\n\r","\n\n","\r\r","\r"),"\n",$types);
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$types= str_replace("\t"," ",$types);
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$this->mMimeToExt= array();
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$this->mToMime= array();
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$lines= explode("\n",$types);
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foreach ($lines as $s) {
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$s= trim($s);
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if (empty($s)) continue;
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if (strpos($s,'#')===0) continue;
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$s= strtolower($s);
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$i= strpos($s,' ');
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if ($i===false) continue;
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#print "processing MIME line $s<br>";
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$mime= substr($s,0,$i);
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$ext= trim(substr($s,$i+1));
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if (empty($ext)) continue;
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if (@$this->mMimeToExt[$mime]) $this->mMimeToExt[$mime] .= ' '.$ext;
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else $this->mMimeToExt[$mime]= $ext;
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$extensions= explode(' ',$ext);
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foreach ($extensions as $e) {
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$e= trim($e);
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if (empty($e)) continue;
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if (@$this->mExtToMime[$e]) $this->mExtToMime[$e] .= ' '.$mime;
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else $this->mExtToMime[$e]= $mime;
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}
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}
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/*
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* --- load mime.info ---
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*/
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global $wgMimeInfoFile;
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$info= MM_WELL_KNOWN_MIME_INFO;
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if ($wgMimeInfoFile) {
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if (is_file($wgMimeInfoFile) and is_readable($wgMimeInfoFile)) {
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wfDebug("MimeMagic::MimeMagic: loading mime info from $wgMimeInfoFile\n");
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$info.= "\n";
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$info.= file_get_contents($wgMimeInfoFile);
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}
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else wfDebug("MimeMagic::MimeMagic: can't load mime info from $wgMimeInfoFile\n");
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}
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else wfDebug("MimeMagic::MimeMagic: no mime info file defined, using build-ins only.\n");
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$info= str_replace(array("\r\n","\n\r","\n\n","\r\r","\r"),"\n",$info);
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$info= str_replace("\t"," ",$info);
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$this->mMimeTypeAliases= array();
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$this->mMediaTypes= array();
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$lines= explode("\n",$info);
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foreach ($lines as $s) {
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$s= trim($s);
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if (empty($s)) continue;
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if (strpos($s,'#')===0) continue;
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$s= strtolower($s);
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$i= strpos($s,' ');
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if ($i===false) continue;
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#print "processing MIME INFO line $s<br>";
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$match= array();
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if (preg_match('!\[\s*(\w+)\s*\]!',$s,$match)) {
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$s= preg_replace('!\[\s*(\w+)\s*\]!','',$s);
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$mtype= trim(strtoupper($match[1]));
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}
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else $mtype= MEDIATYPE_UNKNOWN;
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$m= explode(' ',$s);
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if (!isset($this->mMediaTypes[$mtype])) $this->mMediaTypes[$mtype]= array();
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foreach ($m as $mime) {
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$mime= trim($mime);
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if (empty($mime)) continue;
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$this->mMediaTypes[$mtype][]= $mime;
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}
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if (sizeof($m)>1) {
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$main= $m[0];
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for ($i=1; $i<sizeof($m); $i+= 1) {
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$mime= $m[$i];
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$this->mMimeTypeAliases[$mime]= $main;
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}
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}
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}
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}
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/** returns a list of file extensions for a given mime type
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* as a space separated string.
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*/
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function getExtensionsForType($mime) {
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$mime= strtolower($mime);
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$r= @$this->mMimeToExt[$mime];
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if (@!$r and isset($this->mMimeTypeAliases[$mime])) {
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$mime= $this->mMimeTypeAliases[$mime];
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$r= @$this->mMimeToExt[$mime];
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}
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return $r;
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}
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/** returns a list of mime types for a given file extension
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* as a space separated string.
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*/
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function getTypesForExtension($ext) {
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$ext= strtolower($ext);
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$r= @$this->mExtToMime[$ext];
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return $r;
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}
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/** returns a single mime type for a given file extension.
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* This is always the first type from the list returned by getTypesForExtension($ext).
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*/
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function guessTypesForExtension($ext) {
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$m= $this->getTypesForExtension( $ext );
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if( is_null($m) ) return NULL;
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$m= trim( $m );
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$m= preg_replace('/\s.*$/','',$m);
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return $m;
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}
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/** tests if the extension matches the given mime type.
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* returns true if a match was found, NULL if the mime type is unknown,
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* and false if the mime type is known but no matches where found.
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*/
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function isMatchingExtension($extension,$mime) {
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$ext= $this->getExtensionsForType($mime);
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if (!$ext) {
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return NULL; //unknown
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}
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$ext= explode(' ',$ext);
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$extension= strtolower($extension);
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if (in_array($extension,$ext)) {
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return true;
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}
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return false;
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}
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/** returns true if the mime type is known to represent
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* an image format supported by the PHP GD library.
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*/
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function isPHPImageType( $mime ) {
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#as defined by imagegetsize and image_type_to_mime
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static $types = array(
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'image/gif', 'image/jpeg', 'image/png',
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'image/x-bmp', 'image/xbm', 'image/tiff',
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'image/jp2', 'image/jpeg2000', 'image/iff',
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'image/xbm', 'image/x-xbitmap',
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'image/vnd.wap.wbmp', 'image/vnd.xiff',
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'image/x-photoshop',
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'application/x-shockwave-flash',
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);
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return in_array( $mime, $types );
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}
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/**
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* Returns true if the extension represents a type which can
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* be reliably detected from its content. Use this to determine
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* whether strict content checks should be applied to reject
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* invalid uploads; if we can't identify the type we won't
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* be able to say if it's invalid.
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*
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* @todo Be more accurate when using fancy mime detector plugins;
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* right now this is the bare minimum getimagesize() list.
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* @return bool
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*/
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function isRecognizableExtension( $extension ) {
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static $types = array(
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'gif', 'jpeg', 'jpg', 'png', 'swf', 'psd',
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'bmp', 'tiff', 'tif', 'jpc', 'jp2',
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'jpx', 'jb2', 'swc', 'iff', 'wbmp',
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'xbm', 'djvu'
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);
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return in_array( strtolower( $extension ), $types );
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}
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/** mime type detection. This uses detectMimeType to detect the mim type of the file,
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* but applies additional checks to determine some well known file formats that may be missed
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* or misinterpreter by the default mime detection (namely xml based formats like XHTML or SVG).
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*
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* @param string $file The file to check
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* @param bool $useExt switch for allowing to use the file extension to guess the mime type. true by default.
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*
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* @return string the mime type of $file
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*/
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function guessMimeType( $file, $useExt=true ) {
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$fname = 'MimeMagic::guessMimeType';
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$mime= $this->detectMimeType($file,$useExt);
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// Read a chunk of the file
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$f = fopen( $file, "rt" );
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if( !$f ) return "unknown/unknown";
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$head = fread( $f, 1024 );
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fclose( $f );
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$sub4 = substr( $head, 0, 4 );
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if ( $sub4 == "\x01\x00\x09\x00" || $sub4 == "\xd7\xcd\xc6\x9a" ) {
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// WMF kill kill kill
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// Note that WMF may have a bare header, no magic number.
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// The former of the above two checks is theoretically prone to false positives
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$mime = "application/x-msmetafile";
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}
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if (strpos($mime,"text/")===0 || $mime==="application/xml") {
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$xml_type= NULL;
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$script_type= NULL;
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/*
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* look for XML formats (XHTML and SVG)
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*/
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if ($mime==="text/sgml" ||
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$mime==="text/plain" ||
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$mime==="text/html" ||
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$mime==="text/xml" ||
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$mime==="application/xml") {
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if (substr($head,0,5)=="<?xml") $xml_type= "ASCII";
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elseif (substr($head,0,8)=="\xef\xbb\xbf<?xml") $xml_type= "UTF-8";
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elseif (substr($head,0,10)=="\xfe\xff\x00<\x00?\x00x\x00m\x00l") $xml_type= "UTF-16BE";
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elseif (substr($head,0,10)=="\xff\xfe<\x00?\x00x\x00m\x00l\x00") $xml_type= "UTF-16LE";
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if ($xml_type) {
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if ($xml_type!=="UTF-8" && $xml_type!=="ASCII") $head= iconv($xml_type,"ASCII//IGNORE",$head);
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$match= array();
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$doctype= "";
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$tag= "";
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if (preg_match('%<!DOCTYPE\s+[\w-]+\s+PUBLIC\s+["'."'".'"](.*?)["'."'".'"].*>%sim',$head,$match)) $doctype= $match[1];
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if (preg_match('%<(\w+).*>%sim',$head,$match)) $tag= $match[1];
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#print "<br>ANALYSING $file ($mime): doctype= $doctype; tag= $tag<br>";
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if (strpos($doctype,"-//W3C//DTD SVG")===0) $mime= "image/svg";
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elseif ($tag==="svg") $mime= "image/svg";
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elseif (strpos($doctype,"-//W3C//DTD XHTML")===0) $mime= "text/html";
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elseif ($tag==="html") $mime= "text/html";
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$test_more= false;
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}
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}
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/*
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* look for shell scripts
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*/
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if (!$xml_type) {
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$script_type= NULL;
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#detect by shebang
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if (substr($head,0,2)=="#!") $script_type= "ASCII";
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elseif (substr($head,0,5)=="\xef\xbb\xbf#!") $script_type= "UTF-8";
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elseif (substr($head,0,7)=="\xfe\xff\x00#\x00!") $script_type= "UTF-16BE";
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elseif (substr($head,0,7)=="\xff\xfe#\x00!") $script_type= "UTF-16LE";
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if ($script_type) {
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if ($script_type!=="UTF-8" && $script_type!=="ASCII") $head= iconv($script_type,"ASCII//IGNORE",$head);
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$match= array();
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$prog= "";
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if (preg_match('%/?([^\s]+/)(w+)%sim',$head,$match)) $script= $match[2];
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$mime= "application/x-$prog";
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}
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}
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/*
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* look for PHP
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*/
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if( !$xml_type && !$script_type ) {
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if( ( strpos( $head, '<?php' ) !== false ) ||
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( strpos( $head, '<? ' ) !== false ) ||
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( strpos( $head, "<?\n" ) !== false ) ||
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( strpos( $head, "<?\t" ) !== false ) ||
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( strpos( $head, "<?=" ) !== false ) ||
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( strpos( $head, "<\x00?\x00p\x00h\x00p" ) !== false ) ||
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( strpos( $head, "<\x00?\x00 " ) !== false ) ||
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( strpos( $head, "<\x00?\x00\n" ) !== false ) ||
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( strpos( $head, "<\x00?\x00\t" ) !== false ) ||
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( strpos( $head, "<\x00?\x00=" ) !== false ) ) {
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$mime= "application/x-php";
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}
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}
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}
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if (isset($this->mMimeTypeAliases[$mime])) $mime= $this->mMimeTypeAliases[$mime];
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wfDebug("$fname: final mime type of $file: $mime\n");
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return $mime;
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}
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/** Internal mime type detection, please use guessMimeType() for application code instead.
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* Detection is done using an external program, if $wgMimeDetectorCommand is set.
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* Otherwise, the fileinfo extension and mime_content_type are tried (in this order), if they are available.
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* If the dections fails and $useExt is true, the mime type is guessed from the file extension, using guessTypesForExtension.
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* If the mime type is still unknown, getimagesize is used to detect the mime type if the file is an image.
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* If no mime type can be determined, this function returns "unknown/unknown".
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*
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* @param string $file The file to check
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* @param bool $useExt switch for allowing to use the file extension to guess the mime type. true by default.
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*
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* @return string the mime type of $file
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* @access private
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*/
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function detectMimeType( $file, $useExt=true ) {
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$fname = 'MimeMagic::detectMimeType';
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global $wgMimeDetectorCommand;
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$m= NULL;
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if ($wgMimeDetectorCommand) {
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$fn= wfEscapeShellArg($file);
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$m= `$wgMimeDetectorCommand $fn`;
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}
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else if (function_exists("finfo_open") && function_exists("finfo_file")) {
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# This required the fileinfo extension by PECL,
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# see http://pecl.php.net/package/fileinfo
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# This must be compiled into PHP
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#
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# finfo is the official replacement for the deprecated
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# mime_content_type function, see below.
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#
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# If you may need to load the fileinfo extension at runtime, set
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# $wgLoadFileinfoExtension in LocalSettings.php
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$mime_magic_resource = finfo_open(FILEINFO_MIME); /* return mime type ala mimetype extension */
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if ($mime_magic_resource) {
|
|
$m= finfo_file($mime_magic_resource, $file);
|
|
|
|
finfo_close($mime_magic_resource);
|
|
}
|
|
else wfDebug("$fname: finfo_open failed on ".FILEINFO_MIME."!\n");
|
|
}
|
|
else if (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 Winodws, you must set mime_magic.magicfile in php.ini to point to the mime.magic file bundeled 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("$fname: no magic mime detector found!\n");
|
|
|
|
if ($m) {
|
|
#normalize
|
|
$m= preg_replace('![;, ].*$!','',$m); #strip charset, etc
|
|
$m= trim($m);
|
|
$m= strtolower($m);
|
|
|
|
if (strpos($m,'unknown')!==false) $m= NULL;
|
|
else {
|
|
wfDebug("$fname: magic mime type of $file: $m\n");
|
|
return $m;
|
|
}
|
|
}
|
|
|
|
#if still not known, use getimagesize to find out the type of image
|
|
#TODO: skip things that do not have a well-known image extension? Would that be safe?
|
|
wfSuppressWarnings();
|
|
$gis = getimagesize( $file );
|
|
wfRestoreWarnings();
|
|
|
|
$notAnImage= false;
|
|
|
|
if ($gis && is_array($gis) && $gis[2]) {
|
|
switch ($gis[2]) {
|
|
case IMAGETYPE_GIF: $m= "image/gif"; break;
|
|
case IMAGETYPE_JPEG: $m= "image/jpeg"; break;
|
|
case IMAGETYPE_PNG: $m= "image/png"; break;
|
|
case IMAGETYPE_SWF: $m= "application/x-shockwave-flash"; break;
|
|
case IMAGETYPE_PSD: $m= "application/photoshop"; break;
|
|
case IMAGETYPE_BMP: $m= "image/bmp"; break;
|
|
case IMAGETYPE_TIFF_II: $m= "image/tiff"; break;
|
|
case IMAGETYPE_TIFF_MM: $m= "image/tiff"; break;
|
|
case IMAGETYPE_JPC: $m= "image"; break;
|
|
case IMAGETYPE_JP2: $m= "image/jpeg2000"; break;
|
|
case IMAGETYPE_JPX: $m= "image/jpeg2000"; break;
|
|
case IMAGETYPE_JB2: $m= "image"; break;
|
|
case IMAGETYPE_SWC: $m= "application/x-shockwave-flash"; break;
|
|
case IMAGETYPE_IFF: $m= "image/vnd.xiff"; break;
|
|
case IMAGETYPE_WBMP: $m= "image/vnd.wap.wbmp"; break;
|
|
case IMAGETYPE_XBM: $m= "image/x-xbitmap"; break;
|
|
}
|
|
|
|
if ($m) {
|
|
wfDebug("$fname: image mime type of $file: $m\n");
|
|
return $m;
|
|
}
|
|
else $notAnImage= true;
|
|
} else {
|
|
// Also test DjVu
|
|
$deja = new DjVuImage( $file );
|
|
if( $deja->isValid() ) {
|
|
wfDebug("$fname: detected $file as image/vnd.djvu\n");
|
|
return 'image/vnd.djvu';
|
|
}
|
|
}
|
|
|
|
#if desired, look at extension as a fallback.
|
|
if ($useExt) {
|
|
$i = strrpos( $file, '.' );
|
|
$e= strtolower( $i ? substr( $file, $i + 1 ) : '' );
|
|
|
|
$m= $this->guessTypesForExtension($e);
|
|
|
|
#TODO: if $notAnImage is set, do not trust the file extension if
|
|
# the results is one of the image types that should have been recognized
|
|
# by getimagesize
|
|
|
|
if ($m) {
|
|
wfDebug("$fname: extension mime type of $file: $m\n");
|
|
return $m;
|
|
}
|
|
}
|
|
|
|
#unknown type
|
|
wfDebug("$fname: 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
|
|
$e= NULL;
|
|
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 funktion relies on the mapping defined by $this->mMediaTypes
|
|
* @access private
|
|
*/
|
|
function findMediaType($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;
|
|
}
|
|
}
|
|
|
|
?>
|