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         /** @var string Path to file */
  31         protected $path;
  32
  33         /** @var string File SHA-1 in base 36 */
  34         protected $sha1Base36;
  35
  36         /**
  37          * Sets up the file object
  38          *
  39          * @param string $path Path to temporary file on local disk
  40          */
  41         public function __construct( $path ) {
  42                 $this->path = $path;
  43         }
  44
  45         /**
  46          * Returns the file system path
  47          *
  48          * @return string
  49          */
  50         public function getPath() {
  51                 return $this->path;
  52         }
  53
  54         /**
  55          * Checks if the file exists
  56          *
  57          * @return bool
  58          */
  59         public function exists() {
  60                 return is_file( $this->path );
  61         }
  62
  63         /**
  64          * Get the file size in bytes
  65          *
  66          * @return int|bool
  67          */
  68         public function getSize() {
  69                 return filesize( $this->path );
  70         }
  71
  72         /**
  73          * Get the file's last-modified timestamp
  74          *
  75          * @return string|bool TS_MW timestamp or false on failure
  76          */
  77         public function getTimestamp() {
  78                 MediaWiki\suppressWarnings();
  79                 $timestamp = filemtime( $this->path );
  80                 MediaWiki\restoreWarnings();
  81                 if ( $timestamp !== false ) {
  82                         $timestamp = wfTimestamp( TS_MW, $timestamp );
  83                 }
  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 string|bool $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                 wfDebug( __METHOD__ . ": Getting file info for $this->path\n" );
 108
 109                 $info = self::placeholderProps();
 110                 $info['fileExists'] = $this->exists();
 111
 112                 if ( $info['fileExists'] ) {
 113                         $magic = MimeMagic::singleton();
 114
 115                         # get the file extension
 116                         if ( $ext === true ) {
 117                                 $ext = self::extensionFromPath( $this->path );
 118                         }
 119
 120                         # MIME type according to file contents
 121                         $info['file-mime'] = $this->getMimeType();
 122                         # logical MIME type
 123                         $info['mime'] = $magic->improveTypeFromExtension( $info['file-mime'], $ext );
 124
 125                         list( $info['major_mime'], $info['minor_mime'] ) = File::splitMime( $info['mime'] );
 126                         $info['media_type'] = $magic->getMediaType( $this->path, $info['mime'] );
 127
 128                         # Get size in bytes
 129                         $info['size'] = $this->getSize();
 130
 131                         # Height, width and metadata
 132                         $handler = MediaHandler::getHandler( $info['mime'] );
 133                         if ( $handler ) {
 134                                 $tempImage = (object)array(); // XXX (hack for File object)
 135                                 $info['metadata'] = $handler->getMetadata( $tempImage, $this->path );
 136                                 $gis = $handler->getImageSize( $tempImage, $this->path, $info['metadata'] );
 137                                 if ( is_array( $gis ) ) {
 138                                         $info = $this->extractImageSizeInfo( $gis ) + $info;
 139                                 }
 140                         }
 141                         $info['sha1'] = $this->getSha1Base36();
 142
 143                         wfDebug( __METHOD__ . ": $this->path loaded, {$info['size']} bytes, {$info['mime']}.\n" );
 144                 } else {
 145                         wfDebug( __METHOD__ . ": $this->path NOT FOUND!\n" );
 146                 }
 147
 148                 return $info;
 149         }
 150
 151         /**
 152          * Placeholder file properties to use for files that don't exist
 153          *
 154          * @return array
 155          */
 156         public static function placeholderProps() {
 157                 $info = array();
 158                 $info['fileExists'] = false;
 159                 $info['mime'] = null;
 160                 $info['media_type'] = MEDIATYPE_UNKNOWN;
 161                 $info['metadata'] = '';
 162                 $info['sha1'] = '';
 163                 $info['width'] = 0;
 164                 $info['height'] = 0;
 165                 $info['bits'] = 0;
 166
 167                 return $info;
 168         }
 169
 170         /**
 171          * Exract image size information
 172          *
 173          * @param array $gis
 174          * @return array
 175          */
 176         protected function extractImageSizeInfo( array $gis ) {
 177                 $info = array();
 178                 # NOTE: $gis[2] contains a code for the image type. This is no longer used.
 179                 $info['width'] = $gis[0];
 180                 $info['height'] = $gis[1];
 181                 if ( isset( $gis['bits'] ) ) {
 182                         $info['bits'] = $gis['bits'];
 183                 } else {
 184                         $info['bits'] = 0;
 185                 }
 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
 202                 if ( $this->sha1Base36 !== null && !$recache ) {
 203                         return $this->sha1Base36;
 204                 }
 205
 206                 MediaWiki\suppressWarnings();
 207                 $this->sha1Base36 = sha1_file( $this->path );
 208                 MediaWiki\restoreWarnings();
 209
 210                 if ( $this->sha1Base36 !== false ) {
 211                         $this->sha1Base36 = Wikimedia\base_convert( $this->sha1Base36, 16, 36, 31 );
 212                 }
 213
 214                 return $this->sha1Base36;
 215         }
 216
 217         /**
 218          * Get the final file extension from a file system path
 219          *
 220          * @param string $path
 221          * @return string
 222          */
 223         public static function extensionFromPath( $path ) {
 224                 $i = strrpos( $path, '.' );
 225
 226                 return strtolower( $i ? substr( $path, $i + 1 ) : '' );
 227         }
 228
 229         /**
 230          * Get an associative array containing information about a file in the local filesystem.
 231          *
 232          * @param string $path Absolute local filesystem path
 233          * @param string|bool $ext The file extension, or true to extract it from the filename.
 234          *   Set it to false to ignore the extension.
 235          * @return array
 236          */
 237         public static function getPropsFromPath( $path, $ext = true ) {
 238                 $fsFile = new self( $path );
 239
 240                 return $fsFile->getProps( $ext );
 241         }
 242
 243         /**
 244          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
 245          * encoding, zero padded to 31 digits.
 246          *
 247          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
 248          * fairly neatly.
 249          *
 250          * @param string $path
 251          * @return bool|string False on failure
 252          */
 253         public static function getSha1Base36FromPath( $path ) {
 254                 $fsFile = new self( $path );
 255
 256                 return $fsFile->getSha1Base36();
 257         }
 258 }