includes/filebackend/FSFile.php

   1 <?php
   2 /**
   3  * Non-directory file on the file system.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup FileBackend
  22  */
  23
  24 /**
  25  * Class representing a non-directory file on the file system
  26  *
  27  * @ingroup FileBackend
  28  */
  29 class FSFile {
  30         protected $path; // path to file
  31         private $sha1Base36 = null; // File Sha1Base36
  32
  33         /**
  34          * Sets up the file object
  35          *
  36          * @param string $path Path to temporary file on local disk
  37          * @throws MWException
  38          */
  39         public function __construct( $path ) {
  40                 if ( FileBackend::isStoragePath( $path ) ) {
  41                         throw new MWException( __METHOD__ . " given storage path `$path`." );
  42                 }
  43                 $this->path = $path;
  44         }
  45
  46         /**
  47          * Returns the file system path
  48          *
  49          * @return String
  50          */
  51         public function getPath() {
  52                 return $this->path;
  53         }
  54
  55         /**
  56          * Checks if the file exists
  57          *
  58          * @return bool
  59          */
  60         public function exists() {
  61                 return is_file( $this->path );
  62         }
  63
  64         /**
  65          * Get the file size in bytes
  66          *
  67          * @return int|bool
  68          */
  69         public function getSize() {
  70                 return filesize( $this->path );
  71         }
  72
  73         /**
  74          * Get the file's last-modified timestamp
  75          *
  76          * @return string|bool TS_MW timestamp or false on failure
  77          */
  78         public function getTimestamp() {
  79                 wfSuppressWarnings();
  80                 $timestamp = filemtime( $this->path );
  81                 wfRestoreWarnings();
  82                 if ( $timestamp !== false ) {
  83                         $timestamp = wfTimestamp( TS_MW, $timestamp );
  84                 }
  85                 return $timestamp;
  86         }
  87
  88         /**
  89          * Guess the MIME type from the file contents alone
  90          *
  91          * @return string
  92          */
  93         public function getMimeType() {
  94                 return MimeMagic::singleton()->guessMimeType( $this->path, false );
  95         }
  96
  97         /**
  98          * Get an associative array containing information about
  99          * a file with the given storage path.
 100          *
 101          * @param Mixed $ext: the file extension, or true to extract it from the filename.
 102          *             Set it to false to ignore the extension.
 103          *
 104          * @return array
 105          */
 106         public function getProps( $ext = true ) {
 107                 wfProfileIn( __METHOD__ );
 108                 wfDebug( __METHOD__ . ": Getting file info for $this->path\n" );
 109
 110                 $info = self::placeholderProps();
 111                 $info['fileExists'] = $this->exists();
 112
 113                 if ( $info['fileExists'] ) {
 114                         $magic = MimeMagic::singleton();
 115
 116                         # get the file extension
 117                         if ( $ext === true ) {
 118                                 $ext = self::extensionFromPath( $this->path );
 119                         }
 120
 121                         # mime type according to file contents
 122                         $info['file-mime'] = $this->getMimeType();
 123                         # logical mime type
 124                         $info['mime'] = $magic->improveTypeFromExtension( $info['file-mime'], $ext );
 125
 126                         list( $info['major_mime'], $info['minor_mime'] ) = File::splitMime( $info['mime'] );
 127                         $info['media_type'] = $magic->getMediaType( $this->path, $info['mime'] );
 128
 129                         # Get size in bytes
 130                         $info['size'] = $this->getSize();
 131
 132                         # Height, width and metadata
 133                         $handler = MediaHandler::getHandler( $info['mime'] );
 134                         if ( $handler ) {
 135                                 $tempImage = (object)array(); // XXX (hack for File object)
 136                                 $info['metadata'] = $handler->getMetadata( $tempImage, $this->path );
 137                                 $gis = $handler->getImageSize( $tempImage, $this->path, $info['metadata'] );
 138                                 if ( is_array( $gis ) ) {
 139                                         $info = $this->extractImageSizeInfo( $gis ) + $info;
 140                                 }
 141                         }
 142                         $info['sha1'] = $this->getSha1Base36();
 143
 144                         wfDebug( __METHOD__ . ": $this->path loaded, {$info['size']} bytes, {$info['mime']}.\n" );
 145                 } else {
 146                         wfDebug( __METHOD__ . ": $this->path NOT FOUND!\n" );
 147                 }
 148
 149                 wfProfileOut( __METHOD__ );
 150                 return $info;
 151         }
 152
 153         /**
 154          * Placeholder file properties to use for files that don't exist
 155          *
 156          * @return Array
 157          */
 158         public static function placeholderProps() {
 159                 $info = array();
 160                 $info['fileExists'] = false;
 161                 $info['mime'] = null;
 162                 $info['media_type'] = MEDIATYPE_UNKNOWN;
 163                 $info['metadata'] = '';
 164                 $info['sha1'] = '';
 165                 $info['width'] = 0;
 166                 $info['height'] = 0;
 167                 $info['bits'] = 0;
 168                 return $info;
 169         }
 170
 171         /**
 172          * Exract image size information
 173          *
 174          * @param array $gis
 175          * @return Array
 176          */
 177         protected function extractImageSizeInfo( array $gis ) {
 178                 $info = array();
 179                 # NOTE: $gis[2] contains a code for the image type. This is no longer used.
 180                 $info['width'] = $gis[0];
 181                 $info['height'] = $gis[1];
 182                 if ( isset( $gis['bits'] ) ) {
 183                         $info['bits'] = $gis['bits'];
 184                 } else {
 185                         $info['bits'] = 0;
 186                 }
 187                 return $info;
 188         }
 189
 190         /**
 191          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
 192          * encoding, zero padded to 31 digits.
 193          *
 194          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
 195          * fairly neatly.
 196          *
 197          * @param bool $recache
 198          * @return bool|string False on failure
 199          */
 200         public function getSha1Base36( $recache = false ) {
 201                 wfProfileIn( __METHOD__ );
 202
 203                 if ( $this->sha1Base36 !== null && !$recache ) {
 204                         wfProfileOut( __METHOD__ );
 205                         return $this->sha1Base36;
 206                 }
 207
 208                 wfSuppressWarnings();
 209                 $this->sha1Base36 = sha1_file( $this->path );
 210                 wfRestoreWarnings();
 211
 212                 if ( $this->sha1Base36 !== false ) {
 213                         $this->sha1Base36 = wfBaseConvert( $this->sha1Base36, 16, 36, 31 );
 214                 }
 215
 216                 wfProfileOut( __METHOD__ );
 217                 return $this->sha1Base36;
 218         }
 219
 220         /**
 221          * Get the final file extension from a file system path
 222          *
 223          * @param string $path
 224          * @return string
 225          */
 226         public static function extensionFromPath( $path ) {
 227                 $i = strrpos( $path, '.' );
 228                 return strtolower( $i ? substr( $path, $i + 1 ) : '' );
 229         }
 230
 231         /**
 232          * Get an associative array containing information about a file in the local filesystem.
 233          *
 234          * @param string $path absolute local filesystem path
 235          * @param Mixed $ext: the file extension, or true to extract it from the filename.
 236          *             Set it to false to ignore the extension.
 237          *
 238          * @return array
 239          */
 240         public static function getPropsFromPath( $path, $ext = true ) {
 241                 $fsFile = new self( $path );
 242                 return $fsFile->getProps( $ext );
 243         }
 244
 245         /**
 246          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
 247          * encoding, zero padded to 31 digits.
 248          *
 249          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
 250          * fairly neatly.
 251          *
 252          * @param string $path
 253          * @param bool $recache
 254          *
 255          * @return bool|string False on failure
 256          */
 257         public static function getSha1Base36FromPath( $path, $recache = false ) {
 258                 static $sha1Base36 = array();
 259
 260                 if ( !isset( $sha1Base36[$path] ) || $recache ) {
 261                         $fsFile = new self( $path );
 262                         $sha1Base36[$path] = $fsFile->getSha1Base36();
 263                 }
 264
 265                 return $sha1Base36[$path];
 266         }
 267 }