Signature.php

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<?php
namespace Magento\Theme\Model\Url\Plugin;

class Signature
{
    const XML_PATH_STATIC_FILE_SIGNATURE = 'dev/static/sign';

    const SIGNATURE_TEMPLATE = 'version%s';

    private $config;

    private $deploymentVersion;

    public function __construct(
        \Magento\Framework\View\Url\ConfigInterface $config,
        \Magento\Framework\App\View\Deployment\Version $deploymentVersion
    ) {
        $this->config = $config;
        $this->deploymentVersion = $deploymentVersion;
    }

    public function afterGetBaseUrl(
        \Magento\Framework\Url\ScopeInterface $subject,
        $baseUrl,
        $type = \Magento\Framework\UrlInterface::URL_TYPE_LINK,
        $secure = null
    ) {
        if ($type == \Magento\Framework\UrlInterface::URL_TYPE_STATIC && $this->isUrlSignatureEnabled()) {
            $baseUrl .= $this->renderUrlSignature() . '/';
        }
        return $baseUrl;
    }

    protected function isUrlSignatureEnabled()
    {
        return (bool)$this->config->getValue(self::XML_PATH_STATIC_FILE_SIGNATURE);
    }

    protected function renderUrlSignature()
    {
        return sprintf(self::SIGNATURE_TEMPLATE, $this->deploymentVersion->getValue());
    }
}