UploadFromFile.php

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<?php
class UploadFromFile extends UploadBase {

        protected $mUpload = null;

        function initializeFromRequest( &$request ) {
                $upload = $request->getUpload( 'wpUploadFile' );                
                $desiredDestName = $request->getText( 'wpDestFile' );
                if( !$desiredDestName )
                        $desiredDestName = $upload->getName();
                        
                return $this->initialize( $desiredDestName, $upload );
        }

        function initialize( $name, $webRequestUpload ) {
                $this->mUpload = $webRequestUpload;
                return $this->initializePathInfo( $name, 
                        $this->mUpload->getTempName(), $this->mUpload->getSize() );
        }

        static function isValidRequest( $request ) {
                # Allow all requests, even if no file is present, so that an error
                # because a post_max_size or upload_max_filesize overflow
                return true;
        }

        public function getSourceType() {
                return 'file';
        }

        public function verifyUpload() {
                # Check for a post_max_size or upload_max_size overflow, so that a 
                # proper error can be shown to the user
                if ( is_null( $this->mTempPath ) || $this->isEmptyFile() ) {
                        if ( $this->mUpload->isIniSizeOverflow() ) {
                                return array( 
                                        'status' => UploadBase::FILE_TOO_LARGE,
                                        'max' => min( 
                                                self::getMaxUploadSize( $this->getSourceType() ), 
                                                wfShorthandToInteger( ini_get( 'upload_max_filesize' ) ), 
                                                wfShorthandToInteger( ini_get( 'post_max_size' ) )
                                        ),
                                );
                        }
                }
                
                return parent::verifyUpload();
        }
}