update Magento module

app/code/Ecomail/Ecomail/Block/System/Config/Form/Field/Status.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Ecomail\Ecomail\Block\System\Config\Form\Field;
+
+use Ecomail\Ecomail\Helper\Data;
+use Ecomail\Ecomail\Model\Api;
+use Exception;
+use Magento\Backend\Block\Template\Context;
+use Magento\Config\Block\System\Config\Form\Field;
+use Magento\Framework\Data\Form\Element\AbstractElement;
+
+class Status extends Field
+{
+    /**
+     * @var string
+     */
+    protected $_template = 'Ecomail_Ecomail::system/config/form/field/status.phtml';
+
+    /**
+     * @var Data
+     */
+    private $helper;
+
+    /**
+     * @var Api
+     */
+    private $api;
+
+    /**
+     * Status constructor.
+     * @param Context $context
+     * @param Data $helper
+     * @param Api $api
+     * @param array $data
+     */
+    public function __construct(
+        Context $context,
+        Data $helper,
+        Api $api,
+        array $data = []
+    ) {
+        parent::__construct($context, $data);
+        $this->helper = $helper;
+        $this->api = $api;
+    }
+
+    /**
+     * @return string
+     */
+    public function getStatusCode(): string
+    {
+        if (!$this->helper->isEnabled()) {
+            return 'Inactive';
+        }
+
+        try {
+            $this->api->getSubscriberLists();
+            return 'Active';
+        } catch (Exception $e) {
+            return 'Error';
+        }
+    }
+
+    /**
+     * Return element html
+     *
+     * @param AbstractElement $element
+     * @return string
+     *
+     */
+    protected function _getElementHtml(AbstractElement $element): string
+    {
+        return $this->_toHtml();
+    }
+}

app/code/Ecomail/Ecomail/Block/System/Config/Form/Field/Subscriber/LoadLists.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Ecomail\Ecomail\Block\System\Config\Form\Field\Subscriber;
+
+use Magento\Backend\Block\Widget\Button;
+use Magento\Config\Block\System\Config\Form\Field;
+use Magento\Framework\Data\Form\Element\AbstractElement;
+use Magento\Framework\Exception\LocalizedException;
+
+class LoadLists extends Field
+{
+
+    /**
+     * @var string
+     */
+    protected $_template = 'Ecomail_Ecomail::system/config/form/field/subscriber/load_lists.phtml';
+
+    /**
+     * Remove scope label
+     *
+     * @param AbstractElement $element
+     * @return string
+     */
+    public function render(AbstractElement $element): string
+    {
+        $element->unsScope()->unsCanUseWebsiteValue()->unsCanUseDefaultValue();
+        return parent::render($element);
+    }
+
+    /**
+     * Return element html
+     *
+     * @param AbstractElement $element
+     * @return string
+     *
+     */
+    protected function _getElementHtml(AbstractElement $element): string
+    {
+        return $this->_toHtml();
+    }
+
+    /**
+     * @return string
+     * @throws LocalizedException
+     */
+    public function getButtonHtml(): string
+    {
+        $button = $this->getLayout()->createBlock(
+            Button::class
+        )->setData(
+            [
+                'id' => 'load_lists',
+                'label' => __('Load Lists')
+            ]
+        );
+
+        return $button->toHtml();
+    }
+
+    /**
+     * @return string
+     */
+    public function getAjaxUrl(): string
+    {
+        return $this->getUrl('*/system_config_ecomail/loadLists');
+    }
+}

app/code/Ecomail/Ecomail/CHANGELOG.md

@@ -0,0 +1,4 @@
+# Ecomail changelog
+
+## v2.0.0 - 22 Mar, 2021
+* initial release

app/code/Ecomail/Ecomail/Controller/Adminhtml/System/Config/Ecomail/LoadLists.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace Ecomail\Ecomail\Controller\Adminhtml\System\Config\Ecomail;
+
+use Ecomail\Ecomail\Model\Api;
+use Exception;
+use Magento\Backend\App\Action;
+use Magento\Backend\App\Action\Context;
+use Magento\Framework\Controller\ResultFactory;
+use Magento\Framework\Controller\ResultInterface;
+
+class LoadLists extends Action
+{
+    const ADMIN_RESOURCE = 'Ecomail_Ecomail::ecomail_configuration';
+
+    /**
+     * @var Api
+     */
+    private $api;
+
+    public function __construct(
+        Context $context,
+        Api $api
+    ) {
+        parent::__construct($context);
+        $this->api = $api;
+    }
+
+    /**
+     * @return ResultInterface
+     */
+    public function execute(): ResultInterface
+    {
+        $result = $this->resultFactory->create(ResultFactory::TYPE_JSON);
+
+        $apiKey = $this->getRequest()->getParam('api_key');
+
+        try {
+            $subscriberLists = $this->api->getSubscriberLists($apiKey);
+        } catch (Exception $e) {
+            return $result->setData([]);
+        }
+
+        $response = [];
+
+        foreach ($subscriberLists as $list) {
+            $response[] = [
+                'label' => $list['name'],
+                'value' => $list['id'],
+            ];
+        }
+
+        return $result->setData($response);
+    }
+}

app/code/Ecomail/Ecomail/CustomerData/Ecomail.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Ecomail\Ecomail\CustomerData;
+
+use Ecomail\Ecomail\Helper\Data;
+use Magento\Customer\CustomerData\SectionSourceInterface;
+use Magento\Customer\Model\Session;
+use Magento\Framework\DataObject;
+
+class Ecomail extends DataObject implements SectionSourceInterface
+{
+    /**
+     * @var \Magento\Customer\Model\Session
+     */
+    private $customerSession;
+
+    /**
+     * @var Data
+     */
+    private $helper;
+
+    /**
+     * Ecomail constructor.
+     * @param Session $customerSession
+     * @param Data $helper
+     * @param array $data
+     */
+    public function __construct(
+        Session $customerSession,
+        Data  $helper,
+        array $data = []
+    ) {
+        parent::__construct($data);
+        $this->customerSession = $customerSession;
+        $this->helper = $helper;
+    }
+
+    /**
+     * @return array
+     */
+    public function getSectionData(): array
+    {
+        $sectionData = [];
+
+        if ($this->helper->isTrackingEnabled() && $this->customerSession->getEcomailEmail()) {
+            $sectionData['email'] = $this->customerSession->getEcomailEmail();
+            $this->customerSession->setEcomailEmail(null);
+        }
+
+        return $sectionData;
+    }
+}