Footer.php

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<?php
namespace Magento\Theme\Block\Html;

use Magento\Customer\Model\Context;

class Footer extends \Magento\Framework\View\Element\Template implements \Magento\Framework\DataObject\IdentityInterface
{
    protected $_copyright;

    private $miscellaneousHtml;

    protected $httpContext;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\App\Http\Context $httpContext,
        array $data = []
    ) {
        $this->httpContext = $httpContext;
        parent::__construct($context, $data);
    }

    protected function _construct()
    {
        $this->addData(
            [
                'cache_tags' => [\Magento\Store\Model\Store::CACHE_TAG, \Magento\Cms\Model\Block::CACHE_TAG],
            ]
        );
    }

    public function getCacheKeyInfo()
    {
        return [
            'PAGE_FOOTER',
            $this->_storeManager->getStore()->getId(),
            (int)$this->_storeManager->getStore()->isCurrentlySecure(),
            $this->_design->getDesignTheme()->getId(),
            $this->httpContext->getValue(Context::CONTEXT_AUTH),
            $this->getTemplateFile(),
            'template' => $this->getTemplate()
        ];
    }

    public function getCopyright()
    {
        if (!$this->_copyright) {
            $this->_copyright = $this->_scopeConfig->getValue(
                'design/footer/copyright',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
        }
        return __($this->_copyright);
    }

    public function getMiscellaneousHtml()
    {
        if ($this->miscellaneousHtml === null) {
            $this->miscellaneousHtml = $this->_scopeConfig->getValue(
                'design/footer/absolute_footer',
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            );
        }
        return $this->miscellaneousHtml;
    }

    public function getIdentities()
    {
        return [\Magento\Store\Model\Store::CACHE_TAG, \Magento\Cms\Model\Block::CACHE_TAG];
    }

    protected function getCacheLifetime()
    {
        return parent::getCacheLifetime() ?: 3600;
    }
}