includes/filerepo/file/OldLocalFile.php

   1 <?php
   2 /**
   3  * Old file in the oldimage table.
   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 FileAbstraction
  22  */
  23
  24 /**
  25  * Class to represent a file in the oldimage table
  26  *
  27  * @ingroup FileAbstraction
  28  */
  29 class OldLocalFile extends LocalFile {
  30         /** @var string Timestamp */
  31         protected $requestedTime;
  32
  33         /** @var string Archive name */
  34         protected $archive_name;
  35
  36         const CACHE_VERSION = 1;
  37         const MAX_CACHE_ROWS = 20;
  38
  39         /**
  40          * @param Title $title
  41          * @param FileRepo $repo
  42          * @param null|int $time Timestamp or null
  43          * @return OldLocalFile
  44          * @throws MWException
  45          */
  46         static function newFromTitle( $title, $repo, $time = null ) {
  47                 # The null default value is only here to avoid an E_STRICT
  48                 if ( $time === null ) {
  49                         throw new MWException( __METHOD__ . ' got null for $time parameter' );
  50                 }
  51
  52                 return new self( $title, $repo, $time, null );
  53         }
  54
  55         /**
  56          * @param Title $title
  57          * @param FileRepo $repo
  58          * @param string $archiveName
  59          * @return OldLocalFile
  60          */
  61         static function newFromArchiveName( $title, $repo, $archiveName ) {
  62                 return new self( $title, $repo, null, $archiveName );
  63         }
  64
  65         /**
  66          * @param stdClass $row
  67          * @param FileRepo $repo
  68          * @return OldLocalFile
  69          */
  70         static function newFromRow( $row, $repo ) {
  71                 $title = Title::makeTitle( NS_FILE, $row->oi_name );
  72                 $file = new self( $title, $repo, null, $row->oi_archive_name );
  73                 $file->loadFromRow( $row, 'oi_' );
  74
  75                 return $file;
  76         }
  77
  78         /**
  79          * Create a OldLocalFile from a SHA-1 key
  80          * Do not call this except from inside a repo class.
  81          *
  82          * @param string $sha1 Base-36 SHA-1
  83          * @param LocalRepo $repo
  84          * @param string|bool $timestamp MW_timestamp (optional)
  85          *
  86          * @return bool|OldLocalFile
  87          */
  88         static function newFromKey( $sha1, $repo, $timestamp = false ) {
  89                 $dbr = $repo->getSlaveDB();
  90
  91                 $conds = array( 'oi_sha1' => $sha1 );
  92                 if ( $timestamp ) {
  93                         $conds['oi_timestamp'] = $dbr->timestamp( $timestamp );
  94                 }
  95
  96                 $row = $dbr->selectRow( 'oldimage', self::selectFields(), $conds, __METHOD__ );
  97                 if ( $row ) {
  98                         return self::newFromRow( $row, $repo );
  99                 } else {
 100                         return false;
 101                 }
 102         }
 103
 104         /**
 105          * Fields in the oldimage table
 106          * @return array
 107          */
 108         static function selectFields() {
 109                 return array(
 110                         'oi_name',
 111                         'oi_archive_name',
 112                         'oi_size',
 113                         'oi_width',
 114                         'oi_height',
 115                         'oi_metadata',
 116                         'oi_bits',
 117                         'oi_media_type',
 118                         'oi_major_mime',
 119                         'oi_minor_mime',
 120                         'oi_description',
 121                         'oi_user',
 122                         'oi_user_text',
 123                         'oi_timestamp',
 124                         'oi_deleted',
 125                         'oi_sha1',
 126                 );
 127         }
 128
 129         /**
 130          * @param Title $title
 131          * @param FileRepo $repo
 132          * @param string $time Timestamp or null to load by archive name
 133          * @param string $archiveName Archive name or null to load by timestamp
 134          * @throws MWException
 135          */
 136         function __construct( $title, $repo, $time, $archiveName ) {
 137                 parent::__construct( $title, $repo );
 138                 $this->requestedTime = $time;
 139                 $this->archive_name = $archiveName;
 140                 if ( is_null( $time ) && is_null( $archiveName ) ) {
 141                         throw new MWException( __METHOD__ . ': must specify at least one of $time or $archiveName' );
 142                 }
 143         }
 144
 145         /**
 146          * @return bool
 147          */
 148         function getCacheKey() {
 149                 return false;
 150         }
 151
 152         /**
 153          * @return string
 154          */
 155         function getArchiveName() {
 156                 if ( !isset( $this->archive_name ) ) {
 157                         $this->load();
 158                 }
 159
 160                 return $this->archive_name;
 161         }
 162
 163         /**
 164          * @return bool
 165          */
 166         function isOld() {
 167                 return true;
 168         }
 169
 170         /**
 171          * @return bool
 172          */
 173         function isVisible() {
 174                 return $this->exists() && !$this->isDeleted( File::DELETED_FILE );
 175         }
 176
 177         function loadFromDB( $flags = 0 ) {
 178                 $this->dataLoaded = true;
 179
 180                 $dbr = ( $flags & self::READ_LATEST )
 181                         ? $this->repo->getMasterDB()
 182                         : $this->repo->getSlaveDB();
 183
 184                 $conds = array( 'oi_name' => $this->getName() );
 185                 if ( is_null( $this->requestedTime ) ) {
 186                         $conds['oi_archive_name'] = $this->archive_name;
 187                 } else {
 188                         $conds['oi_timestamp'] = $dbr->timestamp( $this->requestedTime );
 189                 }
 190                 $row = $dbr->selectRow( 'oldimage', $this->getCacheFields( 'oi_' ),
 191                         $conds, __METHOD__, array( 'ORDER BY' => 'oi_timestamp DESC' ) );
 192                 if ( $row ) {
 193                         $this->loadFromRow( $row, 'oi_' );
 194                 } else {
 195                         $this->fileExists = false;
 196                 }
 197
 198         }
 199
 200         /**
 201          * Load lazy file metadata from the DB
 202          */
 203         protected function loadExtraFromDB() {
 204
 205                 $this->extraDataLoaded = true;
 206                 $dbr = $this->repo->getSlaveDB();
 207                 $conds = array( 'oi_name' => $this->getName() );
 208                 if ( is_null( $this->requestedTime ) ) {
 209                         $conds['oi_archive_name'] = $this->archive_name;
 210                 } else {
 211                         $conds['oi_timestamp'] = $dbr->timestamp( $this->requestedTime );
 212                 }
 213                 // In theory the file could have just been renamed/deleted...oh well
 214                 $row = $dbr->selectRow( 'oldimage', $this->getLazyCacheFields( 'oi_' ),
 215                         $conds, __METHOD__, array( 'ORDER BY' => 'oi_timestamp DESC' ) );
 216
 217                 if ( !$row ) { // fallback to master
 218                         $dbr = $this->repo->getMasterDB();
 219                         $row = $dbr->selectRow( 'oldimage', $this->getLazyCacheFields( 'oi_' ),
 220                                 $conds, __METHOD__, array( 'ORDER BY' => 'oi_timestamp DESC' ) );
 221                 }
 222
 223                 if ( $row ) {
 224                         foreach ( $this->unprefixRow( $row, 'oi_' ) as $name => $value ) {
 225                                 $this->$name = $value;
 226                         }
 227                 } else {
 228                         throw new MWException( "Could not find data for image '{$this->archive_name}'." );
 229                 }
 230
 231         }
 232
 233         /**
 234          * @param string $prefix
 235          * @return array
 236          */
 237         function getCacheFields( $prefix = 'img_' ) {
 238                 $fields = parent::getCacheFields( $prefix );
 239                 $fields[] = $prefix . 'archive_name';
 240                 $fields[] = $prefix . 'deleted';
 241
 242                 return $fields;
 243         }
 244
 245         /**
 246          * @return string
 247          */
 248         function getRel() {
 249                 return 'archive/' . $this->getHashPath() . $this->getArchiveName();
 250         }
 251
 252         /**
 253          * @return string
 254          */
 255         function getUrlRel() {
 256                 return 'archive/' . $this->getHashPath() . rawurlencode( $this->getArchiveName() );
 257         }
 258
 259         function upgradeRow() {
 260                 $this->loadFromFile();
 261
 262                 # Don't destroy file info of missing files
 263                 if ( !$this->fileExists ) {
 264                         wfDebug( __METHOD__ . ": file does not exist, aborting\n" );
 265
 266                         return;
 267                 }
 268
 269                 $dbw = $this->repo->getMasterDB();
 270                 list( $major, $minor ) = self::splitMime( $this->mime );
 271
 272                 wfDebug( __METHOD__ . ': upgrading ' . $this->archive_name . " to the current schema\n" );
 273                 $dbw->update( 'oldimage',
 274                         array(
 275                                 'oi_size' => $this->size, // sanity
 276                                 'oi_width' => $this->width,
 277                                 'oi_height' => $this->height,
 278                                 'oi_bits' => $this->bits,
 279                                 'oi_media_type' => $this->media_type,
 280                                 'oi_major_mime' => $major,
 281                                 'oi_minor_mime' => $minor,
 282                                 'oi_metadata' => $this->metadata,
 283                                 'oi_sha1' => $this->sha1,
 284                         ), array(
 285                                 'oi_name' => $this->getName(),
 286                                 'oi_archive_name' => $this->archive_name ),
 287                         __METHOD__
 288                 );
 289         }
 290
 291         /**
 292          * @param int $field One of DELETED_* bitfield constants for file or
 293          *   revision rows
 294          * @return bool
 295          */
 296         function isDeleted( $field ) {
 297                 $this->load();
 298
 299                 return ( $this->deleted & $field ) == $field;
 300         }
 301
 302         /**
 303          * Returns bitfield value
 304          * @return int
 305          */
 306         function getVisibility() {
 307                 $this->load();
 308
 309                 return (int)$this->deleted;
 310         }
 311
 312         /**
 313          * Determine if the current user is allowed to view a particular
 314          * field of this image file, if it's marked as deleted.
 315          *
 316          * @param int $field
 317          * @param User|null $user User object to check, or null to use $wgUser
 318          * @return bool
 319          */
 320         function userCan( $field, User $user = null ) {
 321                 $this->load();
 322
 323                 return Revision::userCanBitfield( $this->deleted, $field, $user );
 324         }
 325
 326         /**
 327          * Upload a file directly into archive. Generally for Special:Import.
 328          *
 329          * @param string $srcPath File system path of the source file
 330          * @param string $archiveName Full archive name of the file, in the form
 331          *   $timestamp!$filename, where $filename must match $this->getName()
 332          * @param string $timestamp
 333          * @param string $comment
 334          * @param User $user
 335          * @param int $flags
 336          * @return FileRepoStatus
 337          */
 338         function uploadOld( $srcPath, $archiveName, $timestamp, $comment, $user, $flags = 0 ) {
 339                 $this->lock();
 340
 341                 $dstRel = 'archive/' . $this->getHashPath() . $archiveName;
 342                 $status = $this->publishTo( $srcPath, $dstRel,
 343                         $flags & File::DELETE_SOURCE ? FileRepo::DELETE_SOURCE : 0
 344                 );
 345
 346                 if ( $status->isGood() ) {
 347                         if ( !$this->recordOldUpload( $srcPath, $archiveName, $timestamp, $comment, $user ) ) {
 348                                 $status->fatal( 'filenotfound', $srcPath );
 349                         }
 350                 }
 351
 352                 $this->unlock();
 353
 354                 return $status;
 355         }
 356
 357         /**
 358          * Record a file upload in the oldimage table, without adding log entries.
 359          *
 360          * @param string $srcPath File system path to the source file
 361          * @param string $archiveName The archive name of the file
 362          * @param string $timestamp
 363          * @param string $comment Upload comment
 364          * @param User $user User who did this upload
 365          * @return bool
 366          */
 367         protected function recordOldUpload( $srcPath, $archiveName, $timestamp, $comment, $user ) {
 368                 $dbw = $this->repo->getMasterDB();
 369
 370                 $dstPath = $this->repo->getZonePath( 'public' ) . '/' . $this->getRel();
 371                 $props = $this->repo->getFileProps( $dstPath );
 372                 if ( !$props['fileExists'] ) {
 373                         return false;
 374                 }
 375
 376                 $dbw->insert( 'oldimage',
 377                         array(
 378                                 'oi_name' => $this->getName(),
 379                                 'oi_archive_name' => $archiveName,
 380                                 'oi_size' => $props['size'],
 381                                 'oi_width' => intval( $props['width'] ),
 382                                 'oi_height' => intval( $props['height'] ),
 383                                 'oi_bits' => $props['bits'],
 384                                 'oi_timestamp' => $dbw->timestamp( $timestamp ),
 385                                 'oi_description' => $comment,
 386                                 'oi_user' => $user->getId(),
 387                                 'oi_user_text' => $user->getName(),
 388                                 'oi_metadata' => $props['metadata'],
 389                                 'oi_media_type' => $props['media_type'],
 390                                 'oi_major_mime' => $props['major_mime'],
 391                                 'oi_minor_mime' => $props['minor_mime'],
 392                                 'oi_sha1' => $props['sha1'],
 393                         ), __METHOD__
 394                 );
 395
 396                 return true;
 397         }
 398
 399         /**
 400          * If archive name is an empty string, then file does not "exist"
 401          *
 402          * This is the case for a couple files on Wikimedia servers where
 403          * the old version is "lost".
 404          */
 405         public function exists() {
 406                 $archiveName = $this->getArchiveName();
 407                 if ( $archiveName === '' || !is_string( $archiveName ) ) {
 408                         return false;
 409                 }
 410                 return parent::exists();
 411         }
 412 }