Placeholder.php

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<?php
namespace Magento\Catalog\Model\View\Asset;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\View\Asset\ContextInterface;
use Magento\Framework\View\Asset\File\NotFoundException;
use Magento\Framework\View\Asset\LocalInterface;
use Magento\Framework\View\Asset\Repository;

class Placeholder implements LocalInterface
{
    private $type;

    private $filePath;

    private $contentType = 'image';

    private $context;

    private $assetRepo;

    private $scopeConfig;

    public function __construct(
        ContextInterface $context,
        ScopeConfigInterface $scopeConfig,
        Repository $assetRepo,
        $type
    ) {
        $this->context = $context;
        $this->scopeConfig = $scopeConfig;
        $this->assetRepo = $assetRepo;
        $this->type = $type;
    }

    public function getUrl()
    {
        if ($this->getFilePath() !== null) {
            $result = $this->context->getBaseUrl() . '/' . $this->getModule() . '/' . $this->getFilePath();
        } else {
            $result = $this->assetRepo->getUrl("Magento_Catalog::images/product/placeholder/{$this->type}.jpg");
        }

        return $result;
    }

    public function getContentType()
    {
        return $this->contentType;
    }

    public function getPath()
    {
        if ($this->getFilePath() !== null) {
            $result = $this->getContext()->getPath()
                . DIRECTORY_SEPARATOR . $this->getModule()
                . DIRECTORY_SEPARATOR . $this->getFilePath();
        } else {
            $defaultPlaceholder = $this->assetRepo->createAsset(
                "Magento_Catalog::images/product/placeholder/{$this->type}.jpg"
            );
            try {
                $result = $defaultPlaceholder->getSourceFile();
            } catch (NotFoundException $e) {
                $result = null;
            }
        }

        return $result;
    }

    public function getSourceFile()
    {
        return $this->getPath();
    }

    public function getSourceContentType()
    {
        return $this->contentType;
    }

    public function getContent()
    {
        return null;
    }

    public function getFilePath()
    {
        if ($this->filePath !== null) {
            return $this->filePath;
        }
        // check if placeholder defined in config
        $isConfigPlaceholder = $this->scopeConfig->getValue(
            "catalog/placeholder/{$this->type}_placeholder",
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        $this->filePath = $isConfigPlaceholder;

        return $this->filePath;
    }

    public function getContext()
    {
        return $this->context;
    }

    public function getModule()
    {
        return 'placeholder';
    }
}