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();
        }

        $this->initialize( $desiredDestName, $upload );
    }

    function initialize( $name, $webRequestUpload ) {
        $this->mUpload = $webRequestUpload;
        $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 [
                    'status' => UploadBase::FILE_TOO_LARGE,
                    'max' => min(
                        self::getMaxUploadSize( $this->getSourceType() ),
                        self::getMaxPhpUploadSize()
                    ),
                ];
            }
        }

        return parent::verifyUpload();
    }
}