includes/upload/UploadBase.php

   1 <?php
   2 /**
   3  * Base class for the backend of file upload.
   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 Upload
  22  */
  23
  24 /**
  25  * @defgroup Upload Upload related
  26  */
  27
  28 /**
  29  * @ingroup Upload
  30  *
  31  * UploadBase and subclasses are the backend of MediaWiki's file uploads.
  32  * The frontends are formed by ApiUpload and SpecialUpload.
  33  *
  34  * @author Brion Vibber
  35  * @author Bryan Tong Minh
  36  * @author Michael Dale
  37  */
  38 abstract class UploadBase {
  39         /** @var string Local file system path to the file to upload (or a local copy) */
  40         protected $mTempPath;
  41         /** @var TempFSFile|null Wrapper to handle deleting the temp file */
  42         protected $tempFileObj;
  43
  44         protected $mDesiredDestName, $mDestName, $mRemoveTempFile, $mSourceType;
  45         protected $mTitle = false, $mTitleError = 0;
  46         protected $mFilteredName, $mFinalExtension;
  47         protected $mLocalFile, $mFileSize, $mFileProps;
  48         protected $mBlackListedExtensions;
  49         protected $mJavaDetected, $mSVGNSError;
  50
  51         protected static $safeXmlEncodings = [
  52                 'UTF-8',
  53                 'ISO-8859-1',
  54                 'ISO-8859-2',
  55                 'UTF-16',
  56                 'UTF-32'
  57         ];
  58
  59         const SUCCESS = 0;
  60         const OK = 0;
  61         const EMPTY_FILE = 3;
  62         const MIN_LENGTH_PARTNAME = 4;
  63         const ILLEGAL_FILENAME = 5;
  64         const OVERWRITE_EXISTING_FILE = 7; # Not used anymore; handled by verifyTitlePermissions()
  65         const FILETYPE_MISSING = 8;
  66         const FILETYPE_BADTYPE = 9;
  67         const VERIFICATION_ERROR = 10;
  68         const HOOK_ABORTED = 11;
  69         const FILE_TOO_LARGE = 12;
  70         const WINDOWS_NONASCII_FILENAME = 13;
  71         const FILENAME_TOO_LONG = 14;
  72
  73         /**
  74          * @param int $error
  75          * @return string
  76          */
  77         public function getVerificationErrorCode( $error ) {
  78                 $code_to_status = [
  79                         self::EMPTY_FILE => 'empty-file',
  80                         self::FILE_TOO_LARGE => 'file-too-large',
  81                         self::FILETYPE_MISSING => 'filetype-missing',
  82                         self::FILETYPE_BADTYPE => 'filetype-banned',
  83                         self::MIN_LENGTH_PARTNAME => 'filename-tooshort',
  84                         self::ILLEGAL_FILENAME => 'illegal-filename',
  85                         self::OVERWRITE_EXISTING_FILE => 'overwrite',
  86                         self::VERIFICATION_ERROR => 'verification-error',
  87                         self::HOOK_ABORTED => 'hookaborted',
  88                         self::WINDOWS_NONASCII_FILENAME => 'windows-nonascii-filename',
  89                         self::FILENAME_TOO_LONG => 'filename-toolong',
  90                 ];
  91                 if ( isset( $code_to_status[$error] ) ) {
  92                         return $code_to_status[$error];
  93                 }
  94
  95                 return 'unknown-error';
  96         }
  97
  98         /**
  99          * Returns true if uploads are enabled.
 100          * Can be override by subclasses.
 101          * @return bool
 102          */
 103         public static function isEnabled() {
 104                 global $wgEnableUploads;
 105
 106                 if ( !$wgEnableUploads ) {
 107                         return false;
 108                 }
 109
 110                 # Check php's file_uploads setting
 111                 return wfIsHHVM() || wfIniGetBool( 'file_uploads' );
 112         }
 113
 114         /**
 115          * Returns true if the user can use this upload module or else a string
 116          * identifying the missing permission.
 117          * Can be overridden by subclasses.
 118          *
 119          * @param User $user
 120          * @return bool|string
 121          */
 122         public static function isAllowed( $user ) {
 123                 foreach ( [ 'upload', 'edit' ] as $permission ) {
 124                         if ( !$user->isAllowed( $permission ) ) {
 125                                 return $permission;
 126                         }
 127                 }
 128
 129                 return true;
 130         }
 131
 132         /**
 133          * Returns true if the user has surpassed the upload rate limit, false otherwise.
 134          *
 135          * @param User $user
 136          * @return bool
 137          */
 138         public static function isThrottled( $user ) {
 139                 return $user->pingLimiter( 'upload' );
 140         }
 141
 142         // Upload handlers. Should probably just be a global.
 143         private static $uploadHandlers = [ 'Stash', 'File', 'Url' ];
 144
 145         /**
 146          * Create a form of UploadBase depending on wpSourceType and initializes it
 147          *
 148          * @param WebRequest $request
 149          * @param string|null $type
 150          * @return null|UploadBase
 151          */
 152         public static function createFromRequest( &$request, $type = null ) {
 153                 $type = $type ? $type : $request->getVal( 'wpSourceType', 'File' );
 154
 155                 if ( !$type ) {
 156                         return null;
 157                 }
 158
 159                 // Get the upload class
 160                 $type = ucfirst( $type );
 161
 162                 // Give hooks the chance to handle this request
 163                 $className = null;
 164                 Hooks::run( 'UploadCreateFromRequest', [ $type, &$className ] );
 165                 if ( is_null( $className ) ) {
 166                         $className = 'UploadFrom' . $type;
 167                         wfDebug( __METHOD__ . ": class name: $className\n" );
 168                         if ( !in_array( $type, self::$uploadHandlers ) ) {
 169                                 return null;
 170                         }
 171                 }
 172
 173                 // Check whether this upload class is enabled
 174                 if ( !call_user_func( [ $className, 'isEnabled' ] ) ) {
 175                         return null;
 176                 }
 177
 178                 // Check whether the request is valid
 179                 if ( !call_user_func( [ $className, 'isValidRequest' ], $request ) ) {
 180                         return null;
 181                 }
 182
 183                 /** @var UploadBase $handler */
 184                 $handler = new $className;
 185
 186                 $handler->initializeFromRequest( $request );
 187
 188                 return $handler;
 189         }
 190
 191         /**
 192          * Check whether a request if valid for this handler
 193          * @param WebRequest $request
 194          * @return bool
 195          */
 196         public static function isValidRequest( $request ) {
 197                 return false;
 198         }
 199
 200         public function __construct() {
 201         }
 202
 203         /**
 204          * Returns the upload type. Should be overridden by child classes
 205          *
 206          * @since 1.18
 207          * @return string
 208          */
 209         public function getSourceType() {
 210                 return null;
 211         }
 212
 213         /**
 214          * Initialize the path information
 215          * @param string $name The desired destination name
 216          * @param string $tempPath The temporary path
 217          * @param int $fileSize The file size
 218          * @param bool $removeTempFile (false) remove the temporary file?
 219          * @throws MWException
 220          */
 221         public function initializePathInfo( $name, $tempPath, $fileSize, $removeTempFile = false ) {
 222                 $this->mDesiredDestName = $name;
 223                 if ( FileBackend::isStoragePath( $tempPath ) ) {
 224                         throw new MWException( __METHOD__ . " given storage path `$tempPath`." );
 225                 }
 226
 227                 $this->setTempFile( $tempPath, $fileSize );
 228                 $this->mRemoveTempFile = $removeTempFile;
 229         }
 230
 231         /**
 232          * Initialize from a WebRequest. Override this in a subclass.
 233          *
 234          * @param WebRequest $request
 235          */
 236         abstract public function initializeFromRequest( &$request );
 237
 238         /**
 239          * @param string $tempPath File system path to temporary file containing the upload
 240          * @param integer $fileSize
 241          */
 242         protected function setTempFile( $tempPath, $fileSize = null ) {
 243                 $this->mTempPath = $tempPath;
 244                 $this->mFileSize = $fileSize ?: null;
 245                 if ( strlen( $this->mTempPath ) && file_exists( $this->mTempPath ) ) {
 246                         $this->tempFileObj = new TempFSFile( $this->mTempPath );
 247                         if ( !$fileSize ) {
 248                                 $this->mFileSize = filesize( $this->mTempPath );
 249                         }
 250                 } else {
 251                         $this->tempFileObj = null;
 252                 }
 253         }
 254
 255         /**
 256          * Fetch the file. Usually a no-op
 257          * @return Status
 258          */
 259         public function fetchFile() {
 260                 return Status::newGood();
 261         }
 262
 263         /**
 264          * Return true if the file is empty
 265          * @return bool
 266          */
 267         public function isEmptyFile() {
 268                 return empty( $this->mFileSize );
 269         }
 270
 271         /**
 272          * Return the file size
 273          * @return int
 274          */
 275         public function getFileSize() {
 276                 return $this->mFileSize;
 277         }
 278
 279         /**
 280          * Get the base 36 SHA1 of the file
 281          * @return string
 282          */
 283         public function getTempFileSha1Base36() {
 284                 return FSFile::getSha1Base36FromPath( $this->mTempPath );
 285         }
 286
 287         /**
 288          * @param string $srcPath The source path
 289          * @return string|bool The real path if it was a virtual URL Returns false on failure
 290          */
 291         function getRealPath( $srcPath ) {
 292                 $repo = RepoGroup::singleton()->getLocalRepo();
 293                 if ( $repo->isVirtualUrl( $srcPath ) ) {
 294                         /** @todo Just make uploads work with storage paths UploadFromStash
 295                          *  loads files via virtual URLs.
 296                          */
 297                         $tmpFile = $repo->getLocalCopy( $srcPath );
 298                         if ( $tmpFile ) {
 299                                 $tmpFile->bind( $this ); // keep alive with $this
 300                         }
 301                         $path = $tmpFile ? $tmpFile->getPath() : false;
 302                 } else {
 303                         $path = $srcPath;
 304                 }
 305
 306                 return $path;
 307         }
 308
 309         /**
 310          * Verify whether the upload is sane.
 311          * @return mixed Const self::OK or else an array with error information
 312          */
 313         public function verifyUpload() {
 314
 315                 /**
 316                  * If there was no filename or a zero size given, give up quick.
 317                  */
 318                 if ( $this->isEmptyFile() ) {
 319                         return [ 'status' => self::EMPTY_FILE ];
 320                 }
 321
 322                 /**
 323                  * Honor $wgMaxUploadSize
 324                  */
 325                 $maxSize = self::getMaxUploadSize( $this->getSourceType() );
 326                 if ( $this->mFileSize > $maxSize ) {
 327                         return [
 328                                 'status' => self::FILE_TOO_LARGE,
 329                                 'max' => $maxSize,
 330                         ];
 331                 }
 332
 333                 /**
 334                  * Look at the contents of the file; if we can recognize the
 335                  * type but it's corrupt or data of the wrong type, we should
 336                  * probably not accept it.
 337                  */
 338                 $verification = $this->verifyFile();
 339                 if ( $verification !== true ) {
 340                         return [
 341                                 'status' => self::VERIFICATION_ERROR,
 342                                 'details' => $verification
 343                         ];
 344                 }
 345
 346                 /**
 347                  * Make sure this file can be created
 348                  */
 349                 $result = $this->validateName();
 350                 if ( $result !== true ) {
 351                         return $result;
 352                 }
 353
 354                 $error = '';
 355                 if ( !Hooks::run( 'UploadVerification',
 356                         [ $this->mDestName, $this->mTempPath, &$error ] )
 357                 ) {
 358                         return [ 'status' => self::HOOK_ABORTED, 'error' => $error ];
 359                 }
 360
 361                 return [ 'status' => self::OK ];
 362         }
 363
 364         /**
 365          * Verify that the name is valid and, if necessary, that we can overwrite
 366          *
 367          * @return mixed True if valid, otherwise and array with 'status'
 368          * and other keys
 369          */
 370         public function validateName() {
 371                 $nt = $this->getTitle();
 372                 if ( is_null( $nt ) ) {
 373                         $result = [ 'status' => $this->mTitleError ];
 374                         if ( $this->mTitleError == self::ILLEGAL_FILENAME ) {
 375                                 $result['filtered'] = $this->mFilteredName;
 376                         }
 377                         if ( $this->mTitleError == self::FILETYPE_BADTYPE ) {
 378                                 $result['finalExt'] = $this->mFinalExtension;
 379                                 if ( count( $this->mBlackListedExtensions ) ) {
 380                                         $result['blacklistedExt'] = $this->mBlackListedExtensions;
 381                                 }
 382                         }
 383
 384                         return $result;
 385                 }
 386                 $this->mDestName = $this->getLocalFile()->getName();
 387
 388                 return true;
 389         }
 390
 391         /**
 392          * Verify the MIME type.
 393          *
 394          * @note Only checks that it is not an evil MIME. The "does it have
 395          *  correct extension given its MIME type?" check is in verifyFile.
 396          *  in `verifyFile()` that MIME type and file extension correlate.
 397          * @param string $mime Representing the MIME
 398          * @return mixed True if the file is verified, an array otherwise
 399          */
 400         protected function verifyMimeType( $mime ) {
 401                 global $wgVerifyMimeType;
 402                 if ( $wgVerifyMimeType ) {
 403                         wfDebug( "mime: <$mime> extension: <{$this->mFinalExtension}>\n" );
 404                         global $wgMimeTypeBlacklist;
 405                         if ( $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
 406                                 return [ 'filetype-badmime', $mime ];
 407                         }
 408
 409                         # Check what Internet Explorer would detect
 410                         $fp = fopen( $this->mTempPath, 'rb' );
 411                         $chunk = fread( $fp, 256 );
 412                         fclose( $fp );
 413
 414                         $magic = MimeMagic::singleton();
 415                         $extMime = $magic->guessTypesForExtension( $this->mFinalExtension );
 416                         $ieTypes = $magic->getIEMimeTypes( $this->mTempPath, $chunk, $extMime );
 417                         foreach ( $ieTypes as $ieType ) {
 418                                 if ( $this->checkFileExtension( $ieType, $wgMimeTypeBlacklist ) ) {
 419                                         return [ 'filetype-bad-ie-mime', $ieType ];
 420                                 }
 421                         }
 422                 }
 423
 424                 return true;
 425         }
 426
 427         /**
 428          * Verifies that it's ok to include the uploaded file
 429          *
 430          * @return mixed True of the file is verified, array otherwise.
 431          */
 432         protected function verifyFile() {
 433                 global $wgVerifyMimeType, $wgDisableUploadScriptChecks;
 434
 435                 $status = $this->verifyPartialFile();
 436                 if ( $status !== true ) {
 437                         return $status;
 438                 }
 439
 440                 $this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 441                 $mime = $this->mFileProps['mime'];
 442
 443                 if ( $wgVerifyMimeType ) {
 444                         # XXX: Missing extension will be caught by validateName() via getTitle()
 445                         if ( $this->mFinalExtension != '' && !$this->verifyExtension( $mime, $this->mFinalExtension ) ) {
 446                                 return [ 'filetype-mime-mismatch', $this->mFinalExtension, $mime ];
 447                         }
 448                 }
 449
 450                 # check for htmlish code and javascript
 451                 if ( !$wgDisableUploadScriptChecks ) {
 452                         if ( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
 453                                 $svgStatus = $this->detectScriptInSvg( $this->mTempPath, false );
 454                                 if ( $svgStatus !== false ) {
 455                                         return $svgStatus;
 456                                 }
 457                         }
 458                 }
 459
 460                 $handler = MediaHandler::getHandler( $mime );
 461                 if ( $handler ) {
 462                         $handlerStatus = $handler->verifyUpload( $this->mTempPath );
 463                         if ( !$handlerStatus->isOK() ) {
 464                                 $errors = $handlerStatus->getErrorsArray();
 465
 466                                 return reset( $errors );
 467                         }
 468                 }
 469
 470                 Hooks::run( 'UploadVerifyFile', [ $this, $mime, &$status ] );
 471                 if ( $status !== true ) {
 472                         return $status;
 473                 }
 474
 475                 wfDebug( __METHOD__ . ": all clear; passing.\n" );
 476
 477                 return true;
 478         }
 479
 480         /**
 481          * A verification routine suitable for partial files
 482          *
 483          * Runs the blacklist checks, but not any checks that may
 484          * assume the entire file is present.
 485          *
 486          * @return mixed True for valid or array with error message key.
 487          */
 488         protected function verifyPartialFile() {
 489                 global $wgAllowJavaUploads, $wgDisableUploadScriptChecks;
 490
 491                 # getTitle() sets some internal parameters like $this->mFinalExtension
 492                 $this->getTitle();
 493
 494                 $this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
 495
 496                 # check MIME type, if desired
 497                 $mime = $this->mFileProps['file-mime'];
 498                 $status = $this->verifyMimeType( $mime );
 499                 if ( $status !== true ) {
 500                         return $status;
 501                 }
 502
 503                 # check for htmlish code and javascript
 504                 if ( !$wgDisableUploadScriptChecks ) {
 505                         if ( self::detectScript( $this->mTempPath, $mime, $this->mFinalExtension ) ) {
 506                                 return [ 'uploadscripted' ];
 507                         }
 508                         if ( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
 509                                 $svgStatus = $this->detectScriptInSvg( $this->mTempPath, true );
 510                                 if ( $svgStatus !== false ) {
 511                                         return $svgStatus;
 512                                 }
 513                         }
 514                 }
 515
 516                 # Check for Java applets, which if uploaded can bypass cross-site
 517                 # restrictions.
 518                 if ( !$wgAllowJavaUploads ) {
 519                         $this->mJavaDetected = false;
 520                         $zipStatus = ZipDirectoryReader::read( $this->mTempPath,
 521                                 [ $this, 'zipEntryCallback' ] );
 522                         if ( !$zipStatus->isOK() ) {
 523                                 $errors = $zipStatus->getErrorsArray();
 524                                 $error = reset( $errors );
 525                                 if ( $error[0] !== 'zip-wrong-format' ) {
 526                                         return $error;
 527                                 }
 528                         }
 529                         if ( $this->mJavaDetected ) {
 530                                 return [ 'uploadjava' ];
 531                         }
 532                 }
 533
 534                 # Scan the uploaded file for viruses
 535                 $virus = $this->detectVirus( $this->mTempPath );
 536                 if ( $virus ) {
 537                         return [ 'uploadvirus', $virus ];
 538                 }
 539
 540                 return true;
 541         }
 542
 543         /**
 544          * Callback for ZipDirectoryReader to detect Java class files.
 545          *
 546          * @param array $entry
 547          */
 548         function zipEntryCallback( $entry ) {
 549                 $names = [ $entry['name'] ];
 550
 551                 // If there is a null character, cut off the name at it, because JDK's
 552                 // ZIP_GetEntry() uses strcmp() if the name hashes match. If a file name
 553                 // were constructed which had ".class\0" followed by a string chosen to
 554                 // make the hash collide with the truncated name, that file could be
 555                 // returned in response to a request for the .class file.
 556                 $nullPos = strpos( $entry['name'], "\000" );
 557                 if ( $nullPos !== false ) {
 558                         $names[] = substr( $entry['name'], 0, $nullPos );
 559                 }
 560
 561                 // If there is a trailing slash in the file name, we have to strip it,
 562                 // because that's what ZIP_GetEntry() does.
 563                 if ( preg_grep( '!\.class/?$!', $names ) ) {
 564                         $this->mJavaDetected = true;
 565                 }
 566         }
 567
 568         /**
 569          * Alias for verifyTitlePermissions. The function was originally
 570          * 'verifyPermissions', but that suggests it's checking the user, when it's
 571          * really checking the title + user combination.
 572          *
 573          * @param User $user User object to verify the permissions against
 574          * @return mixed An array as returned by getUserPermissionsErrors or true
 575          *   in case the user has proper permissions.
 576          */
 577         public function verifyPermissions( $user ) {
 578                 return $this->verifyTitlePermissions( $user );
 579         }
 580
 581         /**
 582          * Check whether the user can edit, upload and create the image. This
 583          * checks only against the current title; if it returns errors, it may
 584          * very well be that another title will not give errors. Therefore
 585          * isAllowed() should be called as well for generic is-user-blocked or
 586          * can-user-upload checking.
 587          *
 588          * @param User $user User object to verify the permissions against
 589          * @return mixed An array as returned by getUserPermissionsErrors or true
 590          *   in case the user has proper permissions.
 591          */
 592         public function verifyTitlePermissions( $user ) {
 593                 /**
 594                  * If the image is protected, non-sysop users won't be able
 595                  * to modify it by uploading a new revision.
 596                  */
 597                 $nt = $this->getTitle();
 598                 if ( is_null( $nt ) ) {
 599                         return true;
 600                 }
 601                 $permErrors = $nt->getUserPermissionsErrors( 'edit', $user );
 602                 $permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $user );
 603                 if ( !$nt->exists() ) {
 604                         $permErrorsCreate = $nt->getUserPermissionsErrors( 'create', $user );
 605                 } else {
 606                         $permErrorsCreate = [];
 607                 }
 608                 if ( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
 609                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
 610                         $permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
 611
 612                         return $permErrors;
 613                 }
 614
 615                 $overwriteError = $this->checkOverwrite( $user );
 616                 if ( $overwriteError !== true ) {
 617                         return [ $overwriteError ];
 618                 }
 619
 620                 return true;
 621         }
 622
 623         /**
 624          * Check for non fatal problems with the file.
 625          *
 626          * This should not assume that mTempPath is set.
 627          *
 628          * @return array Array of warnings
 629          */
 630         public function checkWarnings() {
 631                 global $wgLang;
 632
 633                 $warnings = [];
 634
 635                 $localFile = $this->getLocalFile();
 636                 $localFile->load( File::READ_LATEST );
 637                 $filename = $localFile->getName();
 638
 639                 /**
 640                  * Check whether the resulting filename is different from the desired one,
 641                  * but ignore things like ucfirst() and spaces/underscore things
 642                  */
 643                 $comparableName = str_replace( ' ', '_', $this->mDesiredDestName );
 644                 $comparableName = Title::capitalize( $comparableName, NS_FILE );
 645
 646                 if ( $this->mDesiredDestName != $filename && $comparableName != $filename ) {
 647                         $warnings['badfilename'] = $filename;
 648                         // Debugging for bug 62241
 649                         wfDebugLog( 'upload', "Filename: '$filename', mDesiredDestName: "
 650                                 . "'$this->mDesiredDestName', comparableName: '$comparableName'" );
 651                 }
 652
 653                 // Check whether the file extension is on the unwanted list
 654                 global $wgCheckFileExtensions, $wgFileExtensions;
 655                 if ( $wgCheckFileExtensions ) {
 656                         $extensions = array_unique( $wgFileExtensions );
 657                         if ( !$this->checkFileExtension( $this->mFinalExtension, $extensions ) ) {
 658                                 $warnings['filetype-unwanted-type'] = [ $this->mFinalExtension,
 659                                         $wgLang->commaList( $extensions ), count( $extensions ) ];
 660                         }
 661                 }
 662
 663                 global $wgUploadSizeWarning;
 664                 if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
 665                         $warnings['large-file'] = [ $wgUploadSizeWarning, $this->mFileSize ];
 666                 }
 667
 668                 if ( $this->mFileSize == 0 ) {
 669                         $warnings['emptyfile'] = true;
 670                 }
 671
 672                 $exists = self::getExistsWarning( $localFile );
 673                 if ( $exists !== false ) {
 674                         $warnings['exists'] = $exists;
 675                 }
 676
 677                 if ( $localFile->wasDeleted() && !$localFile->exists() ) {
 678                         $warnings['was-deleted'] = $filename;
 679                 }
 680
 681                 // Check dupes against existing files
 682                 $hash = $this->getTempFileSha1Base36();
 683                 $dupes = RepoGroup::singleton()->findBySha1( $hash );
 684                 $title = $this->getTitle();
 685                 // Remove all matches against self
 686                 foreach ( $dupes as $key => $dupe ) {
 687                         if ( $title->equals( $dupe->getTitle() ) ) {
 688                                 unset( $dupes[$key] );
 689                         }
 690                 }
 691                 if ( $dupes ) {
 692                         $warnings['duplicate'] = $dupes;
 693                 }
 694
 695                 // Check dupes against archives
 696                 $archivedFile = new ArchivedFile( null, 0, '', $hash );
 697                 if ( $archivedFile->getID() > 0 ) {
 698                         if ( $archivedFile->userCan( File::DELETED_FILE ) ) {
 699                                 $warnings['duplicate-archive'] = $archivedFile->getName();
 700                         } else {
 701                                 $warnings['duplicate-archive'] = '';
 702                         }
 703                 }
 704
 705                 return $warnings;
 706         }
 707
 708         /**
 709          * Really perform the upload. Stores the file in the local repo, watches
 710          * if necessary and runs the UploadComplete hook.
 711          *
 712          * @param string $comment
 713          * @param string $pageText
 714          * @param bool $watch Whether the file page should be added to user's watchlist.
 715          *   (This doesn't check $user's permissions.)
 716          * @param User $user
 717          * @param string[] $tags Change tags to add to the log entry and page revision.
 718          *   (This doesn't check $user's permissions.)
 719          * @return Status Indicating the whether the upload succeeded.
 720          */
 721         public function performUpload( $comment, $pageText, $watch, $user, $tags = [] ) {
 722                 $this->getLocalFile()->load( File::READ_LATEST );
 723
 724                 $status = $this->getLocalFile()->upload(
 725                         $this->mTempPath,
 726                         $comment,
 727                         $pageText,
 728                         File::DELETE_SOURCE,
 729                         $this->mFileProps,
 730                         false,
 731                         $user,
 732                         $tags
 733                 );
 734
 735                 if ( $status->isGood() ) {
 736                         if ( $watch ) {
 737                                 WatchAction::doWatch(
 738                                         $this->getLocalFile()->getTitle(),
 739                                         $user,
 740                                         User::IGNORE_USER_RIGHTS
 741                                 );
 742                         }
 743                         Hooks::run( 'UploadComplete', [ &$this ] );
 744
 745                         $this->postProcessUpload();
 746                 }
 747
 748                 return $status;
 749         }
 750
 751         /**
 752          * Perform extra steps after a successful upload.
 753          *
 754          * @since  1.25
 755          */
 756         public function postProcessUpload() {
 757                 global $wgUploadThumbnailRenderMap;
 758
 759                 $jobs = [];
 760
 761                 $sizes = $wgUploadThumbnailRenderMap;
 762                 rsort( $sizes );
 763
 764                 $file = $this->getLocalFile();
 765
 766                 foreach ( $sizes as $size ) {
 767                         if ( $file->isVectorized() || $file->getWidth() > $size ) {
 768                                 $jobs[] = new ThumbnailRenderJob(
 769                                         $file->getTitle(),
 770                                         [ 'transformParams' => [ 'width' => $size ] ]
 771                                 );
 772                         }
 773                 }
 774
 775                 if ( $jobs ) {
 776                         JobQueueGroup::singleton()->push( $jobs );
 777                 }
 778         }
 779
 780         /**
 781          * Returns the title of the file to be uploaded. Sets mTitleError in case
 782          * the name was illegal.
 783          *
 784          * @return Title The title of the file or null in case the name was illegal
 785          */
 786         public function getTitle() {
 787                 if ( $this->mTitle !== false ) {
 788                         return $this->mTitle;
 789                 }
 790                 if ( !is_string( $this->mDesiredDestName ) ) {
 791                         $this->mTitleError = self::ILLEGAL_FILENAME;
 792                         $this->mTitle = null;
 793
 794                         return $this->mTitle;
 795                 }
 796                 /* Assume that if a user specified File:Something.jpg, this is an error
 797                  * and that the namespace prefix needs to be stripped of.
 798                  */
 799                 $title = Title::newFromText( $this->mDesiredDestName );
 800                 if ( $title && $title->getNamespace() == NS_FILE ) {
 801                         $this->mFilteredName = $title->getDBkey();
 802                 } else {
 803                         $this->mFilteredName = $this->mDesiredDestName;
 804                 }
 805
 806                 # oi_archive_name is max 255 bytes, which include a timestamp and an
 807                 # exclamation mark, so restrict file name to 240 bytes.
 808                 if ( strlen( $this->mFilteredName ) > 240 ) {
 809                         $this->mTitleError = self::FILENAME_TOO_LONG;
 810                         $this->mTitle = null;
 811
 812                         return $this->mTitle;
 813                 }
 814
 815                 /**
 816                  * Chop off any directories in the given filename. Then
 817                  * filter out illegal characters, and try to make a legible name
 818                  * out of it. We'll strip some silently that Title would die on.
 819                  */
 820                 $this->mFilteredName = wfStripIllegalFilenameChars( $this->mFilteredName );
 821                 /* Normalize to title form before we do any further processing */
 822                 $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 823                 if ( is_null( $nt ) ) {
 824                         $this->mTitleError = self::ILLEGAL_FILENAME;
 825                         $this->mTitle = null;
 826
 827                         return $this->mTitle;
 828                 }
 829                 $this->mFilteredName = $nt->getDBkey();
 830
 831                 /**
 832                  * We'll want to blacklist against *any* 'extension', and use
 833                  * only the final one for the whitelist.
 834                  */
 835                 list( $partname, $ext ) = $this->splitExtensions( $this->mFilteredName );
 836
 837                 if ( count( $ext ) ) {
 838                         $this->mFinalExtension = trim( $ext[count( $ext ) - 1] );
 839                 } else {
 840                         $this->mFinalExtension = '';
 841
 842                         # No extension, try guessing one
 843                         $magic = MimeMagic::singleton();
 844                         $mime = $magic->guessMimeType( $this->mTempPath );
 845                         if ( $mime !== 'unknown/unknown' ) {
 846                                 # Get a space separated list of extensions
 847                                 $extList = $magic->getExtensionsForType( $mime );
 848                                 if ( $extList ) {
 849                                         # Set the extension to the canonical extension
 850                                         $this->mFinalExtension = strtok( $extList, ' ' );
 851
 852                                         # Fix up the other variables
 853                                         $this->mFilteredName .= ".{$this->mFinalExtension}";
 854                                         $nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
 855                                         $ext = [ $this->mFinalExtension ];
 856                                 }
 857                         }
 858                 }
 859
 860                 /* Don't allow users to override the blacklist (check file extension) */
 861                 global $wgCheckFileExtensions, $wgStrictFileExtensions;
 862                 global $wgFileExtensions, $wgFileBlacklist;
 863
 864                 $blackListedExtensions = $this->checkFileExtensionList( $ext, $wgFileBlacklist );
 865
 866                 if ( $this->mFinalExtension == '' ) {
 867                         $this->mTitleError = self::FILETYPE_MISSING;
 868                         $this->mTitle = null;
 869
 870                         return $this->mTitle;
 871                 } elseif ( $blackListedExtensions ||
 872                         ( $wgCheckFileExtensions && $wgStrictFileExtensions &&
 873                                 !$this->checkFileExtension( $this->mFinalExtension, $wgFileExtensions ) )
 874                 ) {
 875                         $this->mBlackListedExtensions = $blackListedExtensions;
 876                         $this->mTitleError = self::FILETYPE_BADTYPE;
 877                         $this->mTitle = null;
 878
 879                         return $this->mTitle;
 880                 }
 881
 882                 // Windows may be broken with special characters, see bug 1780
 883                 if ( !preg_match( '/^[\x0-\x7f]*$/', $nt->getText() )
 884                         && !RepoGroup::singleton()->getLocalRepo()->backendSupportsUnicodePaths()
 885                 ) {
 886                         $this->mTitleError = self::WINDOWS_NONASCII_FILENAME;
 887                         $this->mTitle = null;
 888
 889                         return $this->mTitle;
 890                 }
 891
 892                 # If there was more than one "extension", reassemble the base
 893                 # filename to prevent bogus complaints about length
 894                 if ( count( $ext ) > 1 ) {
 895                         $iterations = count( $ext ) - 1;
 896                         for ( $i = 0; $i < $iterations; $i++ ) {
 897                                 $partname .= '.' . $ext[$i];
 898                         }
 899                 }
 900
 901                 if ( strlen( $partname ) < 1 ) {
 902                         $this->mTitleError = self::MIN_LENGTH_PARTNAME;
 903                         $this->mTitle = null;
 904
 905                         return $this->mTitle;
 906                 }
 907
 908                 $this->mTitle = $nt;
 909
 910                 return $this->mTitle;
 911         }
 912
 913         /**
 914          * Return the local file and initializes if necessary.
 915          *
 916          * @return LocalFile|UploadStashFile|null
 917          */
 918         public function getLocalFile() {
 919                 if ( is_null( $this->mLocalFile ) ) {
 920                         $nt = $this->getTitle();
 921                         $this->mLocalFile = is_null( $nt ) ? null : wfLocalFile( $nt );
 922                 }
 923
 924                 return $this->mLocalFile;
 925         }
 926
 927         /**
 928          * If the user does not supply all necessary information in the first upload
 929          * form submission (either by accident or by design) then we may want to
 930          * stash the file temporarily, get more information, and publish the file
 931          * later.
 932          *
 933          * This method will stash a file in a temporary directory for later
 934          * processing, and save the necessary descriptive info into the database.
 935          * This method returns the file object, which also has a 'fileKey' property
 936          * which can be passed through a form or API request to find this stashed
 937          * file again.
 938          *
 939          * @param User $user
 940          * @return UploadStashFile Stashed file
 941          */
 942         public function stashFile( User $user = null ) {
 943                 // was stashSessionFile
 944
 945                 $stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash( $user );
 946                 $file = $stash->stashFile( $this->mTempPath, $this->getSourceType() );
 947                 $this->mLocalFile = $file;
 948
 949                 return $file;
 950         }
 951
 952         /**
 953          * Stash a file in a temporary directory, returning a key which can be used
 954          * to find the file again. See stashFile().
 955          *
 956          * @return string File key
 957          */
 958         public function stashFileGetKey() {
 959                 return $this->stashFile()->getFileKey();
 960         }
 961
 962         /**
 963          * alias for stashFileGetKey, for backwards compatibility
 964          *
 965          * @return string File key
 966          */
 967         public function stashSession() {
 968                 return $this->stashFileGetKey();
 969         }
 970
 971         /**
 972          * If we've modified the upload file we need to manually remove it
 973          * on exit to clean up.
 974          */
 975         public function cleanupTempFile() {
 976                 if ( $this->mRemoveTempFile && $this->tempFileObj ) {
 977                         // Delete when all relevant TempFSFile handles go out of scope
 978                         wfDebug( __METHOD__ . ": Marked temporary file '{$this->mTempPath}' for removal\n" );
 979                         $this->tempFileObj->autocollect();
 980                 }
 981         }
 982
 983         public function getTempPath() {
 984                 return $this->mTempPath;
 985         }
 986
 987         /**
 988          * Split a file into a base name and all dot-delimited 'extensions'
 989          * on the end. Some web server configurations will fall back to
 990          * earlier pseudo-'extensions' to determine type and execute
 991          * scripts, so the blacklist needs to check them all.
 992          *
 993          * @param string $filename
 994          * @return array
 995          */
 996         public static function splitExtensions( $filename ) {
 997                 $bits = explode( '.', $filename );
 998                 $basename = array_shift( $bits );
 999
1000                 return [ $basename, $bits ];
1001         }
1002
1003         /**
1004          * Perform case-insensitive match against a list of file extensions.
1005          * Returns true if the extension is in the list.
1006          *
1007          * @param string $ext
1008          * @param array $list
1009          * @return bool
1010          */
1011         public static function checkFileExtension( $ext, $list ) {
1012                 return in_array( strtolower( $ext ), $list );
1013         }
1014
1015         /**
1016          * Perform case-insensitive match against a list of file extensions.
1017          * Returns an array of matching extensions.
1018          *
1019          * @param array $ext
1020          * @param array $list
1021          * @return bool
1022          */
1023         public static function checkFileExtensionList( $ext, $list ) {
1024                 return array_intersect( array_map( 'strtolower', $ext ), $list );
1025         }
1026
1027         /**
1028          * Checks if the MIME type of the uploaded file matches the file extension.
1029          *
1030          * @param string $mime The MIME type of the uploaded file
1031          * @param string $extension The filename extension that the file is to be served with
1032          * @return bool
1033          */
1034         public static function verifyExtension( $mime, $extension ) {
1035                 $magic = MimeMagic::singleton();
1036
1037                 if ( !$mime || $mime == 'unknown' || $mime == 'unknown/unknown' ) {
1038                         if ( !$magic->isRecognizableExtension( $extension ) ) {
1039                                 wfDebug( __METHOD__ . ": passing file with unknown detected mime type; " .
1040                                         "unrecognized extension '$extension', can't verify\n" );
1041
1042                                 return true;
1043                         } else {
1044                                 wfDebug( __METHOD__ . ": rejecting file with unknown detected mime type; " .
1045                                         "recognized extension '$extension', so probably invalid file\n" );
1046
1047                                 return false;
1048                         }
1049                 }
1050
1051                 $match = $magic->isMatchingExtension( $extension, $mime );
1052
1053                 if ( $match === null ) {
1054                         if ( $magic->getTypesForExtension( $extension ) !== null ) {
1055                                 wfDebug( __METHOD__ . ": No extension known for $mime, but we know a mime for $extension\n" );
1056
1057                                 return false;
1058                         } else {
1059                                 wfDebug( __METHOD__ . ": no file extension known for mime type $mime, passing file\n" );
1060
1061                                 return true;
1062                         }
1063                 } elseif ( $match === true ) {
1064                         wfDebug( __METHOD__ . ": mime type $mime matches extension $extension, passing file\n" );
1065
1066                         /** @todo If it's a bitmap, make sure PHP or ImageMagick resp. can handle it! */
1067                         return true;
1068                 } else {
1069                         wfDebug( __METHOD__
1070                                 . ": mime type $mime mismatches file extension $extension, rejecting file\n" );
1071
1072                         return false;
1073                 }
1074         }
1075
1076         /**
1077          * Heuristic for detecting files that *could* contain JavaScript instructions or
1078          * things that may look like HTML to a browser and are thus
1079          * potentially harmful. The present implementation will produce false
1080          * positives in some situations.
1081          *
1082          * @param string $file Pathname to the temporary upload file
1083          * @param string $mime The MIME type of the file
1084          * @param string $extension The extension of the file
1085          * @return bool True if the file contains something looking like embedded scripts
1086          */
1087         public static function detectScript( $file, $mime, $extension ) {
1088                 global $wgAllowTitlesInSVG;
1089
1090                 # ugly hack: for text files, always look at the entire file.
1091                 # For binary field, just check the first K.
1092
1093                 if ( strpos( $mime, 'text/' ) === 0 ) {
1094                         $chunk = file_get_contents( $file );
1095                 } else {
1096                         $fp = fopen( $file, 'rb' );
1097                         $chunk = fread( $fp, 1024 );
1098                         fclose( $fp );
1099                 }
1100
1101                 $chunk = strtolower( $chunk );
1102
1103                 if ( !$chunk ) {
1104                         return false;
1105                 }
1106
1107                 # decode from UTF-16 if needed (could be used for obfuscation).
1108                 if ( substr( $chunk, 0, 2 ) == "\xfe\xff" ) {
1109                         $enc = 'UTF-16BE';
1110                 } elseif ( substr( $chunk, 0, 2 ) == "\xff\xfe" ) {
1111                         $enc = 'UTF-16LE';
1112                 } else {
1113                         $enc = null;
1114                 }
1115
1116                 if ( $enc ) {
1117                         $chunk = iconv( $enc, "ASCII//IGNORE", $chunk );
1118                 }
1119
1120                 $chunk = trim( $chunk );
1121
1122                 /** @todo FIXME: Convert from UTF-16 if necessary! */
1123                 wfDebug( __METHOD__ . ": checking for embedded scripts and HTML stuff\n" );
1124
1125                 # check for HTML doctype
1126                 if ( preg_match( "/<!DOCTYPE *X?HTML/i", $chunk ) ) {
1127                         return true;
1128                 }
1129
1130                 // Some browsers will interpret obscure xml encodings as UTF-8, while
1131                 // PHP/expat will interpret the given encoding in the xml declaration (bug 47304)
1132                 if ( $extension == 'svg' || strpos( $mime, 'image/svg' ) === 0 ) {
1133                         if ( self::checkXMLEncodingMissmatch( $file ) ) {
1134                                 return true;
1135                         }
1136                 }
1137
1138                 /**
1139                  * Internet Explorer for Windows performs some really stupid file type
1140                  * autodetection which can cause it to interpret valid image files as HTML
1141                  * and potentially execute JavaScript, creating a cross-site scripting
1142                  * attack vectors.
1143                  *
1144                  * Apple's Safari browser also performs some unsafe file type autodetection
1145                  * which can cause legitimate files to be interpreted as HTML if the
1146                  * web server is not correctly configured to send the right content-type
1147                  * (or if you're really uploading plain text and octet streams!)
1148                  *
1149                  * Returns true if IE is likely to mistake the given file for HTML.
1150                  * Also returns true if Safari would mistake the given file for HTML
1151                  * when served with a generic content-type.
1152                  */
1153                 $tags = [
1154                         '<a href',
1155                         '<body',
1156                         '<head',
1157                         '<html', # also in safari
1158                         '<img',
1159                         '<pre',
1160                         '<script', # also in safari
1161                         '<table'
1162                 ];
1163
1164                 if ( !$wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
1165                         $tags[] = '<title';
1166                 }
1167
1168                 foreach ( $tags as $tag ) {
1169                         if ( false !== strpos( $chunk, $tag ) ) {
1170                                 wfDebug( __METHOD__ . ": found something that may make it be mistaken for html: $tag\n" );
1171
1172                                 return true;
1173                         }
1174                 }
1175
1176                 /*
1177                  * look for JavaScript
1178                  */
1179
1180                 # resolve entity-refs to look at attributes. may be harsh on big files... cache result?
1181                 $chunk = Sanitizer::decodeCharReferences( $chunk );
1182
1183                 # look for script-types
1184                 if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) ) {
1185                         wfDebug( __METHOD__ . ": found script types\n" );
1186
1187                         return true;
1188                 }
1189
1190                 # look for html-style script-urls
1191                 if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
1192                         wfDebug( __METHOD__ . ": found html-style script urls\n" );
1193
1194                         return true;
1195                 }
1196
1197                 # look for css-style script-urls
1198                 if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
1199                         wfDebug( __METHOD__ . ": found css-style script urls\n" );
1200
1201                         return true;
1202                 }
1203
1204                 wfDebug( __METHOD__ . ": no scripts found\n" );
1205
1206                 return false;
1207         }
1208
1209         /**
1210          * Check a whitelist of xml encodings that are known not to be interpreted differently
1211          * by the server's xml parser (expat) and some common browsers.
1212          *
1213          * @param string $file Pathname to the temporary upload file
1214          * @return bool True if the file contains an encoding that could be misinterpreted
1215          */
1216         public static function checkXMLEncodingMissmatch( $file ) {
1217                 global $wgSVGMetadataCutoff;
1218                 $contents = file_get_contents( $file, false, null, -1, $wgSVGMetadataCutoff );
1219                 $encodingRegex = '!encoding[ \t\n\r]*=[ \t\n\r]*[\'"](.*?)[\'"]!si';
1220
1221                 if ( preg_match( "!<\?xml\b(.*?)\?>!si", $contents, $matches ) ) {
1222                         if ( preg_match( $encodingRegex, $matches[1], $encMatch )
1223                                 && !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
1224                         ) {
1225                                 wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
1226
1227                                 return true;
1228                         }
1229                 } elseif ( preg_match( "!<\?xml\b!si", $contents ) ) {
1230                         // Start of XML declaration without an end in the first $wgSVGMetadataCutoff
1231                         // bytes. There shouldn't be a legitimate reason for this to happen.
1232                         wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
1233
1234                         return true;
1235                 } elseif ( substr( $contents, 0, 4 ) == "\x4C\x6F\xA7\x94" ) {
1236                         // EBCDIC encoded XML
1237                         wfDebug( __METHOD__ . ": EBCDIC Encoded XML\n" );
1238
1239                         return true;
1240                 }
1241
1242                 // It's possible the file is encoded with multi-byte encoding, so re-encode attempt to
1243                 // detect the encoding in case is specifies an encoding not whitelisted in self::$safeXmlEncodings
1244                 $attemptEncodings = [ 'UTF-16', 'UTF-16BE', 'UTF-32', 'UTF-32BE' ];
1245                 foreach ( $attemptEncodings as $encoding ) {
1246                         MediaWiki\suppressWarnings();
1247                         $str = iconv( $encoding, 'UTF-8', $contents );
1248                         MediaWiki\restoreWarnings();
1249                         if ( $str != '' && preg_match( "!<\?xml\b(.*?)\?>!si", $str, $matches ) ) {
1250                                 if ( preg_match( $encodingRegex, $matches[1], $encMatch )
1251                                         && !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
1252                                 ) {
1253                                         wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
1254
1255                                         return true;
1256                                 }
1257                         } elseif ( $str != '' && preg_match( "!<\?xml\b!si", $str ) ) {
1258                                 // Start of XML declaration without an end in the first $wgSVGMetadataCutoff
1259                                 // bytes. There shouldn't be a legitimate reason for this to happen.
1260                                 wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
1261
1262                                 return true;
1263                         }
1264                 }
1265
1266                 return false;
1267         }
1268
1269         /**
1270          * @param string $filename
1271          * @param bool $partial
1272          * @return mixed False of the file is verified (does not contain scripts), array otherwise.
1273          */
1274         protected function detectScriptInSvg( $filename, $partial ) {
1275                 $this->mSVGNSError = false;
1276                 $check = new XmlTypeCheck(
1277                         $filename,
1278                         [ $this, 'checkSvgScriptCallback' ],
1279                         true,
1280                         [ 'processing_instruction_handler' => 'UploadBase::checkSvgPICallback' ]
1281                 );
1282                 if ( $check->wellFormed !== true ) {
1283                         // Invalid xml (bug 58553)
1284                         // But only when non-partial (bug 65724)
1285                         return $partial ? false : [ 'uploadinvalidxml' ];
1286                 } elseif ( $check->filterMatch ) {
1287                         if ( $this->mSVGNSError ) {
1288                                 return [ 'uploadscriptednamespace', $this->mSVGNSError ];
1289                         }
1290
1291                         return $check->filterMatchType;
1292                 }
1293
1294                 return false;
1295         }
1296
1297         /**
1298          * Callback to filter SVG Processing Instructions.
1299          * @param string $target Processing instruction name
1300          * @param string $data Processing instruction attribute and value
1301          * @return bool (true if the filter identified something bad)
1302          */
1303         public static function checkSvgPICallback( $target, $data ) {
1304                 // Don't allow external stylesheets (bug 57550)
1305                 if ( preg_match( '/xml-stylesheet/i', $target ) ) {
1306                         return [ 'upload-scripted-pi-callback' ];
1307                 }
1308
1309                 return false;
1310         }
1311
1312         /**
1313          * @todo Replace this with a whitelist filter!
1314          * @param string $element
1315          * @param array $attribs
1316          * @return bool
1317          */
1318         public function checkSvgScriptCallback( $element, $attribs, $data = null ) {
1319
1320                 list( $namespace, $strippedElement ) = $this->splitXmlNamespace( $element );
1321
1322                 // We specifically don't include:
1323                 // http://www.w3.org/1999/xhtml (bug 60771)
1324                 static $validNamespaces = [
1325                         '',
1326                         'adobe:ns:meta/',
1327                         'http://creativecommons.org/ns#',
1328                         'http://inkscape.sourceforge.net/dtd/sodipodi-0.dtd',
1329                         'http://ns.adobe.com/adobeillustrator/10.0/',
1330                         'http://ns.adobe.com/adobesvgviewerextensions/3.0/',
1331                         'http://ns.adobe.com/extensibility/1.0/',
1332                         'http://ns.adobe.com/flows/1.0/',
1333                         'http://ns.adobe.com/illustrator/1.0/',
1334                         'http://ns.adobe.com/imagereplacement/1.0/',
1335                         'http://ns.adobe.com/pdf/1.3/',
1336                         'http://ns.adobe.com/photoshop/1.0/',
1337                         'http://ns.adobe.com/saveforweb/1.0/',
1338                         'http://ns.adobe.com/variables/1.0/',
1339                         'http://ns.adobe.com/xap/1.0/',
1340                         'http://ns.adobe.com/xap/1.0/g/',
1341                         'http://ns.adobe.com/xap/1.0/g/img/',
1342                         'http://ns.adobe.com/xap/1.0/mm/',
1343                         'http://ns.adobe.com/xap/1.0/rights/',
1344                         'http://ns.adobe.com/xap/1.0/stype/dimensions#',
1345                         'http://ns.adobe.com/xap/1.0/stype/font#',
1346                         'http://ns.adobe.com/xap/1.0/stype/manifestitem#',
1347                         'http://ns.adobe.com/xap/1.0/stype/resourceevent#',
1348                         'http://ns.adobe.com/xap/1.0/stype/resourceref#',
1349                         'http://ns.adobe.com/xap/1.0/t/pg/',
1350                         'http://purl.org/dc/elements/1.1/',
1351                         'http://purl.org/dc/elements/1.1',
1352                         'http://schemas.microsoft.com/visio/2003/svgextensions/',
1353                         'http://sodipodi.sourceforge.net/dtd/sodipodi-0.dtd',
1354                         'http://taptrix.com/inkpad/svg_extensions',
1355                         'http://web.resource.org/cc/',
1356                         'http://www.freesoftware.fsf.org/bkchem/cdml',
1357                         'http://www.inkscape.org/namespaces/inkscape',
1358                         'http://www.opengis.net/gml',
1359                         'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
1360                         'http://www.w3.org/2000/svg',
1361                         'http://www.w3.org/tr/rec-rdf-syntax/',
1362                 ];
1363
1364                 if ( !in_array( $namespace, $validNamespaces ) ) {
1365                         wfDebug( __METHOD__ . ": Non-svg namespace '$namespace' in uploaded file.\n" );
1366                         /** @todo Return a status object to a closure in XmlTypeCheck, for MW1.21+ */
1367                         $this->mSVGNSError = $namespace;
1368
1369                         return true;
1370                 }
1371
1372                 /*
1373                  * check for elements that can contain javascript
1374                  */
1375                 if ( $strippedElement == 'script' ) {
1376                         wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file.\n" );
1377
1378                         return [ 'uploaded-script-svg', $strippedElement ];
1379                 }
1380
1381                 # e.g., <svg xmlns="http://www.w3.org/2000/svg">
1382                 #  <handler xmlns:ev="http://www.w3.org/2001/xml-events" ev:event="load">alert(1)</handler> </svg>
1383                 if ( $strippedElement == 'handler' ) {
1384                         wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
1385
1386                         return [ 'uploaded-script-svg', $strippedElement ];
1387                 }
1388
1389                 # SVG reported in Feb '12 that used xml:stylesheet to generate javascript block
1390                 if ( $strippedElement == 'stylesheet' ) {
1391                         wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
1392
1393                         return [ 'uploaded-script-svg', $strippedElement ];
1394                 }
1395
1396                 # Block iframes, in case they pass the namespace check
1397                 if ( $strippedElement == 'iframe' ) {
1398                         wfDebug( __METHOD__ . ": iframe in uploaded file.\n" );
1399
1400                         return [ 'uploaded-script-svg', $strippedElement ];
1401                 }
1402
1403                 # Check <style> css
1404                 if ( $strippedElement == 'style'
1405                         && self::checkCssFragment( Sanitizer::normalizeCss( $data ) )
1406                 ) {
1407                         wfDebug( __METHOD__ . ": hostile css in style element.\n" );
1408                         return [ 'uploaded-hostile-svg' ];
1409                 }
1410
1411                 foreach ( $attribs as $attrib => $value ) {
1412                         $stripped = $this->stripXmlNamespace( $attrib );
1413                         $value = strtolower( $value );
1414
1415                         if ( substr( $stripped, 0, 2 ) == 'on' ) {
1416                                 wfDebug( __METHOD__
1417                                         . ": Found event-handler attribute '$attrib'='$value' in uploaded file.\n" );
1418
1419                                 return [ 'uploaded-event-handler-on-svg', $attrib, $value ];
1420                         }
1421
1422                         # href with non-local target (don't allow http://, javascript:, etc)
1423                         if ( $stripped == 'href'
1424                                 && strpos( $value, 'data:' ) !== 0
1425                                 && strpos( $value, '#' ) !== 0
1426                         ) {
1427                                 if ( !( $strippedElement === 'a'
1428                                         && preg_match( '!^https?://!im', $value ) )
1429                                 ) {
1430                                         wfDebug( __METHOD__ . ": Found href attribute <$strippedElement "
1431                                                 . "'$attrib'='$value' in uploaded file.\n" );
1432
1433                                         return [ 'uploaded-href-attribute-svg', $strippedElement, $attrib, $value ];
1434                                 }
1435                         }
1436
1437                         # only allow data: targets that should be safe. This prevents vectors like,
1438                         # image/svg, text/xml, application/xml, and text/html, which can contain scripts
1439                         if ( $stripped == 'href' && strncasecmp( 'data:', $value, 5 ) === 0 ) {
1440                                 // rfc2397 parameters. This is only slightly slower than (;[\w;]+)*.
1441                                 // @codingStandardsIgnoreStart Generic.Files.LineLength
1442                                 $parameters = '(?>;[a-zA-Z0-9\!#$&\'*+.^_`{|}~-]+=(?>[a-zA-Z0-9\!#$&\'*+.^_`{|}~-]+|"(?>[\0-\x0c\x0e-\x21\x23-\x5b\x5d-\x7f]+|\\\\[\0-\x7f])*"))*(?:;base64)?';
1443                                 // @codingStandardsIgnoreEnd
1444
1445                                 if ( !preg_match( "!^data:\s*image/(gif|jpeg|jpg|png)$parameters,!i", $value ) ) {
1446                                         wfDebug( __METHOD__ . ": Found href to unwhitelisted data: uri "
1447                                                 . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1448                                         return [ 'uploaded-href-unsafe-target-svg', $strippedElement, $attrib, $value ];
1449                                 }
1450                         }
1451
1452                         # Change href with animate from (http://html5sec.org/#137).
1453                         if ( $stripped === 'attributename'
1454                                 && $strippedElement === 'animate'
1455                                 && $this->stripXmlNamespace( $value ) == 'href'
1456                         ) {
1457                                 wfDebug( __METHOD__ . ": Found animate that might be changing href using from "
1458                                         . "\"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
1459
1460                                 return [ 'uploaded-animate-svg', $strippedElement, $attrib, $value ];
1461                         }
1462
1463                         # use set/animate to add event-handler attribute to parent
1464                         if ( ( $strippedElement == 'set' || $strippedElement == 'animate' )
1465                                 && $stripped == 'attributename'
1466                                 && substr( $value, 0, 2 ) == 'on'
1467                         ) {
1468                                 wfDebug( __METHOD__ . ": Found svg setting event-handler attribute with "
1469                                         . "\"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
1470
1471                                 return [ 'uploaded-setting-event-handler-svg', $strippedElement, $stripped, $value ];
1472                         }
1473
1474                         # use set to add href attribute to parent element
1475                         if ( $strippedElement == 'set'
1476                                 && $stripped == 'attributename'
1477                                 && strpos( $value, 'href' ) !== false
1478                         ) {
1479                                 wfDebug( __METHOD__ . ": Found svg setting href attribute '$value' in uploaded file.\n" );
1480
1481                                 return [ 'uploaded-setting-href-svg' ];
1482                         }
1483
1484                         # use set to add a remote / data / script target to an element
1485                         if ( $strippedElement == 'set'
1486                                 && $stripped == 'to'
1487                                 && preg_match( '!(http|https|data|script):!sim', $value )
1488                         ) {
1489                                 wfDebug( __METHOD__ . ": Found svg setting attribute to '$value' in uploaded file.\n" );
1490
1491                                 return [ 'uploaded-wrong-setting-svg', $value ];
1492                         }
1493
1494                         # use handler attribute with remote / data / script
1495                         if ( $stripped == 'handler' && preg_match( '!(http|https|data|script):!sim', $value ) ) {
1496                                 wfDebug( __METHOD__ . ": Found svg setting handler with remote/data/script "
1497                                         . "'$attrib'='$value' in uploaded file.\n" );
1498
1499                                 return [ 'uploaded-setting-handler-svg', $attrib, $value ];
1500                         }
1501
1502                         # use CSS styles to bring in remote code
1503                         if ( $stripped == 'style'
1504                                 && self::checkCssFragment( Sanitizer::normalizeCss( $value ) )
1505                         ) {
1506                                 wfDebug( __METHOD__ . ": Found svg setting a style with "
1507                                         . "remote url '$attrib'='$value' in uploaded file.\n" );
1508                                 return [ 'uploaded-remote-url-svg', $attrib, $value ];
1509                         }
1510
1511                         # Several attributes can include css, css character escaping isn't allowed
1512                         $cssAttrs = [ 'font', 'clip-path', 'fill', 'filter', 'marker',
1513                                 'marker-end', 'marker-mid', 'marker-start', 'mask', 'stroke' ];
1514                         if ( in_array( $stripped, $cssAttrs )
1515                                 && self::checkCssFragment( $value )
1516                         ) {
1517                                 wfDebug( __METHOD__ . ": Found svg setting a style with "
1518                                         . "remote url '$attrib'='$value' in uploaded file.\n" );
1519                                 return [ 'uploaded-remote-url-svg', $attrib, $value ];
1520                         }
1521
1522                         # image filters can pull in url, which could be svg that executes scripts
1523                         if ( $strippedElement == 'image'
1524                                 && $stripped == 'filter'
1525                                 && preg_match( '!url\s*\(!sim', $value )
1526                         ) {
1527                                 wfDebug( __METHOD__ . ": Found image filter with url: "
1528                                         . "\"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
1529
1530                                 return [ 'uploaded-image-filter-svg', $strippedElement, $stripped, $value ];
1531                         }
1532                 }
1533
1534                 return false; // No scripts detected
1535         }
1536
1537         /**
1538          * Check a block of CSS or CSS fragment for anything that looks like
1539          * it is bringing in remote code.
1540          * @param string $value a string of CSS
1541          * @param bool $propOnly only check css properties (start regex with :)
1542          * @return bool true if the CSS contains an illegal string, false if otherwise
1543          */
1544         private static function checkCssFragment( $value ) {
1545
1546                 # Forbid external stylesheets, for both reliability and to protect viewer's privacy
1547                 if ( stripos( $value, '@import' ) !== false ) {
1548                         return true;
1549                 }
1550
1551                 # We allow @font-face to embed fonts with data: urls, so we snip the string
1552                 # 'url' out so this case won't match when we check for urls below
1553                 $pattern = '!(@font-face\s*{[^}]*src:)url(\("data:;base64,)!im';
1554                 $value = preg_replace( $pattern, '$1$2', $value );
1555
1556                 # Check for remote and executable CSS. Unlike in Sanitizer::checkCss, the CSS
1557                 # properties filter and accelerator don't seem to be useful for xss in SVG files.
1558                 # Expression and -o-link don't seem to work either, but filtering them here in case.
1559                 # Additionally, we catch remote urls like url("http:..., url('http:..., url(http:...,
1560                 # but not local ones such as url("#..., url('#..., url(#....
1561                 if ( preg_match( '!expression
1562                                 | -o-link\s*:
1563                                 | -o-link-source\s*:
1564                                 | -o-replace\s*:!imx', $value ) ) {
1565                         return true;
1566                 }
1567
1568                 if ( preg_match_all(
1569                                 "!(\s*(url|image|image-set)\s*\(\s*[\"']?\s*[^#]+.*?\))!sim",
1570                                 $value,
1571                                 $matches
1572                         ) !== 0
1573                 ) {
1574                         # TODO: redo this in one regex. Until then, url("#whatever") matches the first
1575                         foreach ( $matches[1] as $match ) {
1576                                 if ( !preg_match( "!\s*(url|image|image-set)\s*\(\s*(#|'#|\"#)!im", $match ) ) {
1577                                         return true;
1578                                 }
1579                         }
1580                 }
1581
1582                 if ( preg_match( '/[\000-\010\013\016-\037\177]/', $value ) ) {
1583                         return true;
1584                 }
1585
1586                 return false;
1587         }
1588
1589         /**
1590          * Divide the element name passed by the xml parser to the callback into URI and prifix.
1591          * @param string $element
1592          * @return array Containing the namespace URI and prefix
1593          */
1594         private static function splitXmlNamespace( $element ) {
1595                 // 'http://www.w3.org/2000/svg:script' -> array( 'http://www.w3.org/2000/svg', 'script' )
1596                 $parts = explode( ':', strtolower( $element ) );
1597                 $name = array_pop( $parts );
1598                 $ns = implode( ':', $parts );
1599
1600                 return [ $ns, $name ];
1601         }
1602
1603         /**
1604          * @param string $name
1605          * @return string
1606          */
1607         private function stripXmlNamespace( $name ) {
1608                 // 'http://www.w3.org/2000/svg:script' -> 'script'
1609                 $parts = explode( ':', strtolower( $name ) );
1610
1611                 return array_pop( $parts );
1612         }
1613
1614         /**
1615          * Generic wrapper function for a virus scanner program.
1616          * This relies on the $wgAntivirus and $wgAntivirusSetup variables.
1617          * $wgAntivirusRequired may be used to deny upload if the scan fails.
1618          *
1619          * @param string $file Pathname to the temporary upload file
1620          * @return mixed False if not virus is found, null if the scan fails or is disabled,
1621          *   or a string containing feedback from the virus scanner if a virus was found.
1622          *   If textual feedback is missing but a virus was found, this function returns true.
1623          */
1624         public static function detectVirus( $file ) {
1625                 global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
1626
1627                 if ( !$wgAntivirus ) {
1628                         wfDebug( __METHOD__ . ": virus scanner disabled\n" );
1629
1630                         return null;
1631                 }
1632
1633                 if ( !$wgAntivirusSetup[$wgAntivirus] ) {
1634                         wfDebug( __METHOD__ . ": unknown virus scanner: $wgAntivirus\n" );
1635                         $wgOut->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>",
1636                                 [ 'virus-badscanner', $wgAntivirus ] );
1637
1638                         return wfMessage( 'virus-unknownscanner' )->text() . " $wgAntivirus";
1639                 }
1640
1641                 # look up scanner configuration
1642                 $command = $wgAntivirusSetup[$wgAntivirus]['command'];
1643                 $exitCodeMap = $wgAntivirusSetup[$wgAntivirus]['codemap'];
1644                 $msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]['messagepattern'] ) ?
1645                         $wgAntivirusSetup[$wgAntivirus]['messagepattern'] : null;
1646
1647                 if ( strpos( $command, "%f" ) === false ) {
1648                         # simple pattern: append file to scan
1649                         $command .= " " . wfEscapeShellArg( $file );
1650                 } else {
1651                         # complex pattern: replace "%f" with file to scan
1652                         $command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
1653                 }
1654
1655                 wfDebug( __METHOD__ . ": running virus scan: $command \n" );
1656
1657                 # execute virus scanner
1658                 $exitCode = false;
1659
1660                 # NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
1661                 #      that does not seem to be worth the pain.
1662                 #      Ask me (Duesentrieb) about it if it's ever needed.
1663                 $output = wfShellExecWithStderr( $command, $exitCode );
1664
1665                 # map exit code to AV_xxx constants.
1666                 $mappedCode = $exitCode;
1667                 if ( $exitCodeMap ) {
1668                         if ( isset( $exitCodeMap[$exitCode] ) ) {
1669                                 $mappedCode = $exitCodeMap[$exitCode];
1670                         } elseif ( isset( $exitCodeMap["*"] ) ) {
1671                                 $mappedCode = $exitCodeMap["*"];
1672                         }
1673                 }
1674
1675                 /* NB: AV_NO_VIRUS is 0 but AV_SCAN_FAILED is false,
1676                  * so we need the strict equalities === and thus can't use a switch here
1677                  */
1678                 if ( $mappedCode === AV_SCAN_FAILED ) {
1679                         # scan failed (code was mapped to false by $exitCodeMap)
1680                         wfDebug( __METHOD__ . ": failed to scan $file (code $exitCode).\n" );
1681
1682                         $output = $wgAntivirusRequired
1683                                 ? wfMessage( 'virus-scanfailed', [ $exitCode ] )->text()
1684                                 : null;
1685                 } elseif ( $mappedCode === AV_SCAN_ABORTED ) {
1686                         # scan failed because filetype is unknown (probably imune)
1687                         wfDebug( __METHOD__ . ": unsupported file type $file (code $exitCode).\n" );
1688                         $output = null;
1689                 } elseif ( $mappedCode === AV_NO_VIRUS ) {
1690                         # no virus found
1691                         wfDebug( __METHOD__ . ": file passed virus scan.\n" );
1692                         $output = false;
1693                 } else {
1694                         $output = trim( $output );
1695
1696                         if ( !$output ) {
1697                                 $output = true; # if there's no output, return true
1698                         } elseif ( $msgPattern ) {
1699                                 $groups = [];
1700                                 if ( preg_match( $msgPattern, $output, $groups ) ) {
1701                                         if ( $groups[1] ) {
1702                                                 $output = $groups[1];
1703                                         }
1704                                 }
1705                         }
1706
1707                         wfDebug( __METHOD__ . ": FOUND VIRUS! scanner feedback: $output \n" );
1708                 }
1709
1710                 return $output;
1711         }
1712
1713         /**
1714          * Check if there's an overwrite conflict and, if so, if restrictions
1715          * forbid this user from performing the upload.
1716          *
1717          * @param User $user
1718          *
1719          * @return mixed True on success, array on failure
1720          */
1721         private function checkOverwrite( $user ) {
1722                 // First check whether the local file can be overwritten
1723                 $file = $this->getLocalFile();
1724                 $file->load( File::READ_LATEST );
1725                 if ( $file->exists() ) {
1726                         if ( !self::userCanReUpload( $user, $file ) ) {
1727                                 return [ 'fileexists-forbidden', $file->getName() ];
1728                         } else {
1729                                 return true;
1730                         }
1731                 }
1732
1733                 /* Check shared conflicts: if the local file does not exist, but
1734                  * wfFindFile finds a file, it exists in a shared repository.
1735                  */
1736                 $file = wfFindFile( $this->getTitle(), [ 'latest' => true ] );
1737                 if ( $file && !$user->isAllowed( 'reupload-shared' ) ) {
1738                         return [ 'fileexists-shared-forbidden', $file->getName() ];
1739                 }
1740
1741                 return true;
1742         }
1743
1744         /**
1745          * Check if a user is the last uploader
1746          *
1747          * @param User $user
1748          * @param File $img
1749          * @return bool
1750          */
1751         public static function userCanReUpload( User $user, File $img ) {
1752                 if ( $user->isAllowed( 'reupload' ) ) {
1753                         return true; // non-conditional
1754                 } elseif ( !$user->isAllowed( 'reupload-own' ) ) {
1755                         return false;
1756                 }
1757
1758                 if ( !( $img instanceof LocalFile ) ) {
1759                         return false;
1760                 }
1761
1762                 $img->load();
1763
1764                 return $user->getId() == $img->getUser( 'id' );
1765         }
1766
1767         /**
1768          * Helper function that does various existence checks for a file.
1769          * The following checks are performed:
1770          * - The file exists
1771          * - Article with the same name as the file exists
1772          * - File exists with normalized extension
1773          * - The file looks like a thumbnail and the original exists
1774          *
1775          * @param File $file The File object to check
1776          * @return mixed False if the file does not exists, else an array
1777          */
1778         public static function getExistsWarning( $file ) {
1779                 if ( $file->exists() ) {
1780                         return [ 'warning' => 'exists', 'file' => $file ];
1781                 }
1782
1783                 if ( $file->getTitle()->getArticleID() ) {
1784                         return [ 'warning' => 'page-exists', 'file' => $file ];
1785                 }
1786
1787                 if ( strpos( $file->getName(), '.' ) == false ) {
1788                         $partname = $file->getName();
1789                         $extension = '';
1790                 } else {
1791                         $n = strrpos( $file->getName(), '.' );
1792                         $extension = substr( $file->getName(), $n + 1 );
1793                         $partname = substr( $file->getName(), 0, $n );
1794                 }
1795                 $normalizedExtension = File::normalizeExtension( $extension );
1796
1797                 if ( $normalizedExtension != $extension ) {
1798                         // We're not using the normalized form of the extension.
1799                         // Normal form is lowercase, using most common of alternate
1800                         // extensions (eg 'jpg' rather than 'JPEG').
1801
1802                         // Check for another file using the normalized form...
1803                         $nt_lc = Title::makeTitle( NS_FILE, "{$partname}.{$normalizedExtension}" );
1804                         $file_lc = wfLocalFile( $nt_lc );
1805
1806                         if ( $file_lc->exists() ) {
1807                                 return [
1808                                         'warning' => 'exists-normalized',
1809                                         'file' => $file,
1810                                         'normalizedFile' => $file_lc
1811                                 ];
1812                         }
1813                 }
1814
1815                 // Check for files with the same name but a different extension
1816                 $similarFiles = RepoGroup::singleton()->getLocalRepo()->findFilesByPrefix(
1817                         "{$partname}.", 1 );
1818                 if ( count( $similarFiles ) ) {
1819                         return [
1820                                 'warning' => 'exists-normalized',
1821                                 'file' => $file,
1822                                 'normalizedFile' => $similarFiles[0],
1823                         ];
1824                 }
1825
1826                 if ( self::isThumbName( $file->getName() ) ) {
1827                         # Check for filenames like 50px- or 180px-, these are mostly thumbnails
1828                         $nt_thb = Title::newFromText(
1829                                 substr( $partname, strpos( $partname, '-' ) + 1 ) . '.' . $extension,
1830                                 NS_FILE
1831                         );
1832                         $file_thb = wfLocalFile( $nt_thb );
1833                         if ( $file_thb->exists() ) {
1834                                 return [
1835                                         'warning' => 'thumb',
1836                                         'file' => $file,
1837                                         'thumbFile' => $file_thb
1838                                 ];
1839                         } else {
1840                                 // File does not exist, but we just don't like the name
1841                                 return [
1842                                         'warning' => 'thumb-name',
1843                                         'file' => $file,
1844                                         'thumbFile' => $file_thb
1845                                 ];
1846                         }
1847                 }
1848
1849                 foreach ( self::getFilenamePrefixBlacklist() as $prefix ) {
1850                         if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
1851                                 return [
1852                                         'warning' => 'bad-prefix',
1853                                         'file' => $file,
1854                                         'prefix' => $prefix
1855                                 ];
1856                         }
1857                 }
1858
1859                 return false;
1860         }
1861
1862         /**
1863          * Helper function that checks whether the filename looks like a thumbnail
1864          * @param string $filename
1865          * @return bool
1866          */
1867         public static function isThumbName( $filename ) {
1868                 $n = strrpos( $filename, '.' );
1869                 $partname = $n ? substr( $filename, 0, $n ) : $filename;
1870
1871                 return (
1872                         substr( $partname, 3, 3 ) == 'px-' ||
1873                         substr( $partname, 2, 3 ) == 'px-'
1874                 ) &&
1875                 preg_match( "/[0-9]{2}/", substr( $partname, 0, 2 ) );
1876         }
1877
1878         /**
1879          * Get a list of blacklisted filename prefixes from [[MediaWiki:Filename-prefix-blacklist]]
1880          *
1881          * @return array List of prefixes
1882          */
1883         public static function getFilenamePrefixBlacklist() {
1884                 $blacklist = [];
1885                 $message = wfMessage( 'filename-prefix-blacklist' )->inContentLanguage();
1886                 if ( !$message->isDisabled() ) {
1887                         $lines = explode( "\n", $message->plain() );
1888                         foreach ( $lines as $line ) {
1889                                 // Remove comment lines
1890                                 $comment = substr( trim( $line ), 0, 1 );
1891                                 if ( $comment == '#' || $comment == '' ) {
1892                                         continue;
1893                                 }
1894                                 // Remove additional comments after a prefix
1895                                 $comment = strpos( $line, '#' );
1896                                 if ( $comment > 0 ) {
1897                                         $line = substr( $line, 0, $comment - 1 );
1898                                 }
1899                                 $blacklist[] = trim( $line );
1900                         }
1901                 }
1902
1903                 return $blacklist;
1904         }
1905
1906         /**
1907          * Gets image info about the file just uploaded.
1908          *
1909          * Also has the effect of setting metadata to be an 'indexed tag name' in
1910          * returned API result if 'metadata' was requested. Oddly, we have to pass
1911          * the "result" object down just so it can do that with the appropriate
1912          * format, presumably.
1913          *
1914          * @param ApiResult $result
1915          * @return array Image info
1916          */
1917         public function getImageInfo( $result ) {
1918                 $file = $this->getLocalFile();
1919                 /** @todo This cries out for refactoring.
1920                  *  We really want to say $file->getAllInfo(); here.
1921                  * Perhaps "info" methods should be moved into files, and the API should
1922                  * just wrap them in queries.
1923                  */
1924                 if ( $file instanceof UploadStashFile ) {
1925                         $imParam = ApiQueryStashImageInfo::getPropertyNames();
1926                         $info = ApiQueryStashImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1927                 } else {
1928                         $imParam = ApiQueryImageInfo::getPropertyNames();
1929                         $info = ApiQueryImageInfo::getInfo( $file, array_flip( $imParam ), $result );
1930                 }
1931
1932                 return $info;
1933         }
1934
1935         /**
1936          * @param array $error
1937          * @return Status
1938          */
1939         public function convertVerifyErrorToStatus( $error ) {
1940                 $code = $error['status'];
1941                 unset( $code['status'] );
1942
1943                 return Status::newFatal( $this->getVerificationErrorCode( $code ), $error );
1944         }
1945
1946         /**
1947          * Get the MediaWiki maximum uploaded file size for given type of upload, based on
1948          * $wgMaxUploadSize.
1949          *
1950          * @param null|string $forType
1951          * @return int
1952          */
1953         public static function getMaxUploadSize( $forType = null ) {
1954                 global $wgMaxUploadSize;
1955
1956                 if ( is_array( $wgMaxUploadSize ) ) {
1957                         if ( !is_null( $forType ) && isset( $wgMaxUploadSize[$forType] ) ) {
1958                                 return $wgMaxUploadSize[$forType];
1959                         } else {
1960                                 return $wgMaxUploadSize['*'];
1961                         }
1962                 } else {
1963                         return intval( $wgMaxUploadSize );
1964                 }
1965         }
1966
1967         /**
1968          * Get the PHP maximum uploaded file size, based on ini settings. If there is no limit or the
1969          * limit can't be guessed, returns a very large number (PHP_INT_MAX).
1970          *
1971          * @since 1.27
1972          * @return int
1973          */
1974         public static function getMaxPhpUploadSize() {
1975                 $phpMaxFileSize = wfShorthandToInteger(
1976                         ini_get( 'upload_max_filesize' ) ?: ini_get( 'hhvm.server.upload.upload_max_file_size' ),
1977                         PHP_INT_MAX
1978                 );
1979                 $phpMaxPostSize = wfShorthandToInteger(
1980                         ini_get( 'post_max_size' ) ?: ini_get( 'hhvm.server.max_post_size' ),
1981                         PHP_INT_MAX
1982                 ) ?: PHP_INT_MAX;
1983                 return min( $phpMaxFileSize, $phpMaxPostSize );
1984         }
1985
1986         /**
1987          * Get the current status of a chunked upload (used for polling)
1988          *
1989          * The value will be read from cache.
1990          *
1991          * @param User $user
1992          * @param string $statusKey
1993          * @return Status[]|bool
1994          */
1995         public static function getSessionStatus( User $user, $statusKey ) {
1996                 $key = wfMemcKey( 'uploadstatus', $user->getId() ?: md5( $user->getName() ), $statusKey );
1997
1998                 return ObjectCache::getMainStashInstance()->get( $key );
1999         }
2000
2001         /**
2002          * Set the current status of a chunked upload (used for polling)
2003          *
2004          * The value will be set in cache for 1 day
2005          *
2006          * @param User $user
2007          * @param string $statusKey
2008          * @param array|bool $value
2009          * @return void
2010          */
2011         public static function setSessionStatus( User $user, $statusKey, $value ) {
2012                 $key = wfMemcKey( 'uploadstatus', $user->getId() ?: md5( $user->getName() ), $statusKey );
2013
2014                 $cache = ObjectCache::getMainStashInstance();
2015                 if ( $value === false ) {
2016                         $cache->delete( $key );
2017                 } else {
2018                         $cache->set( $key, $value, $cache::TTL_DAY );
2019                 }
2020         }
2021 }