Publisher.php

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<?php
namespace Magento\Framework\App\View\Asset;

use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Filesystem\Directory\WriteFactory;
use Magento\Framework\View\Asset;

class Publisher
{
    protected $filesystem;

    private $materializationStrategyFactory;

    private $writeFactory;

    public function __construct(
        \Magento\Framework\Filesystem $filesystem,
        MaterializationStrategy\Factory $materializationStrategyFactory,
        WriteFactory $writeFactory
    ) {
        $this->filesystem = $filesystem;
        $this->materializationStrategyFactory = $materializationStrategyFactory;
        $this->writeFactory = $writeFactory;
    }

    public function publish(Asset\LocalInterface $asset)
    {
        $dir = $this->filesystem->getDirectoryRead(DirectoryList::STATIC_VIEW);
        if ($dir->isExist($asset->getPath())) {
            return true;
        }

        return $this->publishAsset($asset);
    }

    private function publishAsset(Asset\LocalInterface $asset)
    {
        $targetDir = $this->filesystem->getDirectoryWrite(DirectoryList::STATIC_VIEW);
        $fullSource = $asset->getSourceFile();
        $source = basename($fullSource);
        $sourceDir = $this->writeFactory->create(dirname($fullSource));
        $destination = $asset->getPath();
        $strategy = $this->materializationStrategyFactory->create($asset);
        return $strategy->publishFile($sourceDir, $targetDir, $source, $destination);
    }
}