Config.php

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<?php
namespace Magento\Variable\Model\Variable;

use Magento\Framework\App\ObjectManager;

class Config
{
    protected $_assetRepo;

    protected $_url;

    private $collectionFactory;

    private $storesVariables;

    private $encoder;

    public function __construct(
        \Magento\Framework\View\Asset\Repository $assetRepo,
        \Magento\Backend\Model\UrlInterface $url,
        \Magento\Variable\Model\ResourceModel\Variable\CollectionFactory $collectionFactory = null,
        \Magento\Variable\Model\Source\Variables $storesVariables = null,
        \Magento\Framework\Serialize\Serializer\Json $encoder = null
    ) {
        $this->collectionFactory = $collectionFactory ?: ObjectManager::getInstance()
            ->get(\Magento\Variable\Model\ResourceModel\Variable\CollectionFactory::class);
        $this->storesVariables = $storesVariables ?: ObjectManager::getInstance()
            ->get(\Magento\Variable\Model\Source\Variables::class);
        $this->encoder = $encoder ?: ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
        $this->_url = $url;
        $this->_assetRepo = $assetRepo;
    }

    public function getWysiwygPluginSettings($config)
    {
        $variableConfig = [];
        $onclickParts = [
            'search' => ['html_id'],
            'subject' => 'MagentovariablePlugin.loadChooser(\'' .
                $this->getVariablesWysiwygActionUrl() .
                '\', \'{{html_id}}\');',
        ];
        $variableWysiwyg = [
            [
                'name' => 'magentovariable',
                'src' => $this->getWysiwygJsPluginSrc(),
                'options' => [
                    'title' => __('Insert Variable...'),
                    'url' => $this->getVariablesWysiwygActionUrl(),
                    'onclick' => $onclickParts,
                    'class' => 'add-variable plugin',
                    'placeholders' => $this->getVariablesWysiwygData()
                ],
            ],
        ];
        $configPlugins = (array) $config->getData('plugins');
        $variableConfig['plugins'] = array_merge($configPlugins, $variableWysiwyg);
        return $variableConfig;
    }

    public function getWysiwygJsPluginSrc()
    {
        $editorPluginJs = 'mage/adminhtml/wysiwyg/tiny_mce/plugins/magentovariable/editor_plugin.js';
        return $this->_assetRepo->getUrl($editorPluginJs);
    }

    public function getVariablesWysiwygActionUrl()
    {
        return $this->_url->getUrl('mui/index/render', ['namespace' => 'variables_modal']);
    }

    private function getDefaultVariables()
    {
        $variables = [];
        foreach ($this->storesVariables->getData() as $variable) {
            $variables[$variable['value']] = [
                'code' => $variable['value'],
                'variable_name' => $variable['label'],
                'variable_type' => \Magento\Variable\Model\Source\Variables::DEFAULT_VARIABLE_TYPE
            ];
        }

        return $variables;
    }

    private function getCustomVariables()
    {
        $customVariables = $this->collectionFactory->create();

        $variables = [];
        foreach ($customVariables->getData() as $variable) {
            $variables[$variable['code']] = [
                'code' => $variable['code'],
                'variable_name' => $variable['name'],
                'variable_type' => 'custom'
            ];
        }

        return $variables;
    }

    private function getVariablesWysiwygData()
    {
        $variablesData = array_merge(
            $this->getCustomVariables(),
            $this->getDefaultVariables()
        );
        return $this->encoder->serialize($variablesData);
    }
}