includes/libs/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          * Get an associative array containing information about
  90          * a file with the given storage path.
  91          *
  92          * Resulting array fields include:
  93          *   - fileExists
  94          *   - size (filesize in bytes)
  95          *   - mime (as major/minor)
  96          *   - file-mime (as major/minor)
  97          *   - sha1 (in base 36)
  98          *   - major_mime
  99          *   - minor_mime
 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. Currently unused.
 103          * @return array
 104          */
 105         public function getProps( $ext = true ) {
 106                 $info = self::placeholderProps();
 107                 $info['fileExists'] = $this->exists();
 108
 109                 if ( $info['fileExists'] ) {
 110                         $info['size'] = $this->getSize(); // bytes
 111                         $info['sha1'] = $this->getSha1Base36();
 112
 113                         $mime = mime_content_type( $this->path );
 114                         # MIME type according to file contents
 115                         $info['file-mime'] = ( $mime === false ) ? 'unknown/unknown' : $mime;
 116                         # logical MIME type
 117                         $info['mime'] = $mime;
 118
 119                         if ( strpos( $mime, '/' ) !== false ) {
 120                                 list( $info['major_mime'], $info['minor_mime'] ) = explode( '/', $mime, 2 );
 121                         } else {
 122                                 list( $info['major_mime'], $info['minor_mime'] ) = [ $mime, 'unknown' ];
 123                         }
 124                 }
 125
 126                 return $info;
 127         }
 128
 129         /**
 130          * Placeholder file properties to use for files that don't exist
 131          *
 132          * Resulting array fields include:
 133          *   - fileExists
 134          *   - size (filesize in bytes)
 135          *   - mime (as major/minor)
 136          *   - file-mime (as major/minor)
 137          *   - sha1 (in base 36)
 138          *   - major_mime
 139          *   - minor_mime
 140          *
 141          * @return array
 142          */
 143         public static function placeholderProps() {
 144                 $info = [];
 145                 $info['fileExists'] = false;
 146                 $info['size'] = 0;
 147                 $info['file-mime'] = null;
 148                 $info['major_mime'] = null;
 149                 $info['minor_mime'] = null;
 150                 $info['mime'] = null;
 151                 $info['sha1'] = '';
 152
 153                 return $info;
 154         }
 155
 156         /**
 157          * Exract image size information
 158          *
 159          * @param array $gis
 160          * @return array
 161          */
 162         protected function extractImageSizeInfo( array $gis ) {
 163                 $info = [];
 164                 # NOTE: $gis[2] contains a code for the image type. This is no longer used.
 165                 $info['width'] = $gis[0];
 166                 $info['height'] = $gis[1];
 167                 if ( isset( $gis['bits'] ) ) {
 168                         $info['bits'] = $gis['bits'];
 169                 } else {
 170                         $info['bits'] = 0;
 171                 }
 172
 173                 return $info;
 174         }
 175
 176         /**
 177          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
 178          * encoding, zero padded to 31 digits.
 179          *
 180          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
 181          * fairly neatly.
 182          *
 183          * @param bool $recache
 184          * @return bool|string False on failure
 185          */
 186         public function getSha1Base36( $recache = false ) {
 187                 if ( $this->sha1Base36 !== null && !$recache ) {
 188                         return $this->sha1Base36;
 189                 }
 190
 191                 MediaWiki\suppressWarnings();
 192                 $this->sha1Base36 = sha1_file( $this->path );
 193                 MediaWiki\restoreWarnings();
 194
 195                 if ( $this->sha1Base36 !== false ) {
 196                         $this->sha1Base36 = Wikimedia\base_convert( $this->sha1Base36, 16, 36, 31 );
 197                 }
 198
 199                 return $this->sha1Base36;
 200         }
 201
 202         /**
 203          * Get the final file extension from a file system path
 204          *
 205          * @param string $path
 206          * @return string
 207          */
 208         public static function extensionFromPath( $path ) {
 209                 $i = strrpos( $path, '.' );
 210
 211                 return strtolower( $i ? substr( $path, $i + 1 ) : '' );
 212         }
 213
 214         /**
 215          * Get an associative array containing information about a file in the local filesystem.
 216          *
 217          * @param string $path Absolute local filesystem path
 218          * @param string|bool $ext The file extension, or true to extract it from the filename.
 219          *   Set it to false to ignore the extension.
 220          * @return array
 221          */
 222         public static function getPropsFromPath( $path, $ext = true ) {
 223                 $fsFile = new self( $path );
 224
 225                 return $fsFile->getProps( $ext );
 226         }
 227
 228         /**
 229          * Get a SHA-1 hash of a file in the local filesystem, in base-36 lower case
 230          * encoding, zero padded to 31 digits.
 231          *
 232          * 160 log 2 / log 36 = 30.95, so the 160-bit hash fills 31 digits in base 36
 233          * fairly neatly.
 234          *
 235          * @param string $path
 236          * @return bool|string False on failure
 237          */
 238         public static function getSha1Base36FromPath( $path ) {
 239                 $fsFile = new self( $path );
 240
 241                 return $fsFile->getSha1Base36();
 242         }
 243 }