includes/upload/UploadFromUrl.php

   1 <?php
   2 /**
   3  * Backend for uploading files from a HTTP resource.
   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  * Implements uploading from a HTTP resource.
  26  *
  27  * @ingroup Upload
  28  * @author Bryan Tong Minh
  29  * @author Michael Dale
  30  */
  31 class UploadFromUrl extends UploadBase {
  32         protected $mAsync, $mUrl;
  33         protected $mIgnoreWarnings = true;
  34
  35         protected $mTempPath, $mTmpHandle;
  36
  37         /**
  38          * Checks if the user is allowed to use the upload-by-URL feature. If the
  39          * user is not allowed, return the name of the user right as a string. If
  40          * the user is allowed, have the parent do further permissions checking.
  41          *
  42          * @param $user User
  43          *
  44          * @return bool|string
  45          */
  46         public static function isAllowed( $user ) {
  47                 if ( !$user->isAllowed( 'upload_by_url' ) ) {
  48                         return 'upload_by_url';
  49                 }
  50                 return parent::isAllowed( $user );
  51         }
  52
  53         /**
  54          * Checks if the upload from URL feature is enabled
  55          * @return bool
  56          */
  57         public static function isEnabled() {
  58                 global $wgAllowCopyUploads;
  59                 return $wgAllowCopyUploads && parent::isEnabled();
  60         }
  61
  62         /**
  63          * Checks whether the URL is for an allowed host
  64          *
  65          * @param $url string
  66          * @return bool
  67          */
  68         public static function isAllowedHost( $url ) {
  69                 global $wgCopyUploadsDomains;
  70                 if ( !count( $wgCopyUploadsDomains ) ) {
  71                         return true;
  72                 }
  73                 $parsedUrl = wfParseUrl( $url );
  74                 if ( !$parsedUrl ) {
  75                         return false;
  76                 }
  77                 $valid = false;
  78                 foreach( $wgCopyUploadsDomains as $domain ) {
  79                         if ( $parsedUrl['host'] === $domain ) {
  80                                 $valid = true;
  81                                 break;
  82                         }
  83                 }
  84                 return $valid;
  85         }
  86
  87         /**
  88          * Entry point for API upload
  89          *
  90          * @param $name string
  91          * @param $url string
  92          * @param $async mixed Whether the download should be performed
  93          * asynchronous. False for synchronous, async or async-leavemessage for
  94          * asynchronous download.
  95          * @throws MWException
  96          */
  97         public function initialize( $name, $url, $async = false ) {
  98                 global $wgAllowAsyncCopyUploads;
  99
 100                 $this->mUrl = $url;
 101                 $this->mAsync = $wgAllowAsyncCopyUploads ? $async : false;
 102                 if ( $async ) {
 103                         throw new MWException( 'Asynchronous copy uploads are no longer possible as of r81612.' );
 104                 }
 105
 106                 $tempPath = $this->mAsync ? null : $this->makeTemporaryFile();
 107                 # File size and removeTempFile will be filled in later
 108                 $this->initializePathInfo( $name, $tempPath, 0, false );
 109         }
 110
 111         /**
 112          * Entry point for SpecialUpload
 113          * @param $request WebRequest object
 114          */
 115         public function initializeFromRequest( &$request ) {
 116                 $desiredDestName = $request->getText( 'wpDestFile' );
 117                 if ( !$desiredDestName ) {
 118                         $desiredDestName = $request->getText( 'wpUploadFileURL' );
 119                 }
 120                 $this->initialize(
 121                         $desiredDestName,
 122                         trim( $request->getVal( 'wpUploadFileURL' ) ),
 123                         false
 124                 );
 125         }
 126
 127         /**
 128          * @param $request WebRequest object
 129          * @return bool
 130          */
 131         public static function isValidRequest( $request ) {
 132                 global $wgUser;
 133
 134                 $url = $request->getVal( 'wpUploadFileURL' );
 135                 return !empty( $url )
 136                         && Http::isValidURI( $url )
 137                         && $wgUser->isAllowed( 'upload_by_url' );
 138         }
 139
 140         /**
 141          * @return string
 142          */
 143         public function getSourceType() { return 'url'; }
 144
 145         /**
 146          * @return Status
 147          */
 148         public function fetchFile() {
 149                 if ( !Http::isValidURI( $this->mUrl ) ) {
 150                         return Status::newFatal( 'http-invalid-url' );
 151                 }
 152
 153                 if( !self::isAllowedHost( $this->mUrl ) ) {
 154                         return Status::newFatal( 'upload-copy-upload-invalid-domain' );
 155                 }
 156                 if ( !$this->mAsync ) {
 157                         return $this->reallyFetchFile();
 158                 }
 159                 return Status::newGood();
 160         }
 161         /**
 162          * Create a new temporary file in the URL subdirectory of wfTempDir().
 163          *
 164          * @return string Path to the file
 165          */
 166         protected function makeTemporaryFile() {
 167                 return tempnam( wfTempDir(), 'URL' );
 168         }
 169
 170         /**
 171          * Callback: save a chunk of the result of a HTTP request to the temporary file
 172          *
 173          * @param $req mixed
 174          * @param $buffer string
 175          * @return int number of bytes handled
 176          */
 177         public function saveTempFileChunk( $req, $buffer ) {
 178                 $nbytes = fwrite( $this->mTmpHandle, $buffer );
 179
 180                 if ( $nbytes == strlen( $buffer ) ) {
 181                         $this->mFileSize += $nbytes;
 182                 } else {
 183                         // Well... that's not good!
 184                         fclose( $this->mTmpHandle );
 185                         $this->mTmpHandle = false;
 186                 }
 187
 188                 return $nbytes;
 189         }
 190
 191         /**
 192          * Download the file, save it to the temporary file and update the file
 193          * size and set $mRemoveTempFile to true.
 194          * @return Status
 195          */
 196         protected function reallyFetchFile() {
 197                 if ( $this->mTempPath === false ) {
 198                         return Status::newFatal( 'tmp-create-error' );
 199                 }
 200
 201                 // Note the temporary file should already be created by makeTemporaryFile()
 202                 $this->mTmpHandle = fopen( $this->mTempPath, 'wb' );
 203                 if ( !$this->mTmpHandle ) {
 204                         return Status::newFatal( 'tmp-create-error' );
 205                 }
 206
 207                 $this->mRemoveTempFile = true;
 208                 $this->mFileSize = 0;
 209
 210                 $req = MWHttpRequest::factory( $this->mUrl, array(
 211                         'followRedirects' => true
 212                 ) );
 213                 $req->setCallback( array( $this, 'saveTempFileChunk' ) );
 214                 $status = $req->execute();
 215
 216                 if ( $this->mTmpHandle ) {
 217                         // File got written ok...
 218                         fclose( $this->mTmpHandle );
 219                         $this->mTmpHandle = null;
 220                 } else {
 221                         // We encountered a write error during the download...
 222                         return Status::newFatal( 'tmp-write-error' );
 223                 }
 224
 225                 if ( !$status->isOk() ) {
 226                         return $status;
 227                 }
 228
 229                 return $status;
 230         }
 231
 232         /**
 233          * Wrapper around the parent function in order to defer verifying the
 234          * upload until the file really has been fetched.
 235          * @return array|mixed
 236          */
 237         public function verifyUpload() {
 238                 if ( $this->mAsync ) {
 239                         return array( 'status' => UploadBase::OK );
 240                 }
 241                 return parent::verifyUpload();
 242         }
 243
 244         /**
 245          * Wrapper around the parent function in order to defer checking warnings
 246          * until the file really has been fetched.
 247          * @return Array
 248          */
 249         public function checkWarnings() {
 250                 if ( $this->mAsync ) {
 251                         $this->mIgnoreWarnings = false;
 252                         return array();
 253                 }
 254                 return parent::checkWarnings();
 255         }
 256
 257         /**
 258          * Wrapper around the parent function in order to defer checking protection
 259          * until we are sure that the file can actually be uploaded
 260          * @param $user User
 261          * @return bool|mixed
 262          */
 263         public function verifyTitlePermissions( $user ) {
 264                 if ( $this->mAsync ) {
 265                         return true;
 266                 }
 267                 return parent::verifyTitlePermissions( $user );
 268         }
 269
 270         /**
 271          * Wrapper around the parent function in order to defer uploading to the
 272          * job queue for asynchronous uploads
 273          * @param $comment string
 274          * @param $pageText string
 275          * @param $watch bool
 276          * @param $user User
 277          * @return Status
 278          */
 279         public function performUpload( $comment, $pageText, $watch, $user ) {
 280                 if ( $this->mAsync ) {
 281                         $sessionKey = $this->insertJob( $comment, $pageText, $watch, $user );
 282
 283                         return Status::newFatal( 'async', $sessionKey );
 284                 }
 285
 286                 return parent::performUpload( $comment, $pageText, $watch, $user );
 287         }
 288
 289         /**
 290          * @param $comment
 291          * @param $pageText
 292          * @param $watch
 293          * @param $user User
 294          * @return String
 295          */
 296         protected function insertJob( $comment, $pageText, $watch, $user ) {
 297                 $sessionKey = $this->stashSession();
 298                 $job = new UploadFromUrlJob( $this->getTitle(), array(
 299                         'url' => $this->mUrl,
 300                         'comment' => $comment,
 301                         'pageText' => $pageText,
 302                         'watch' => $watch,
 303                         'userName' => $user->getName(),
 304                         'leaveMessage' => $this->mAsync == 'async-leavemessage',
 305                         'ignoreWarnings' => $this->mIgnoreWarnings,
 306                         'sessionId' => session_id(),
 307                         'sessionKey' => $sessionKey,
 308                 ) );
 309                 $job->initializeSessionData();
 310                 $job->insert();
 311                 return $sessionKey;
 312         }
 313
 314 }