first commit

plugins/privacy/contact/contact.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="plugin" group="privacy" method="upgrade">
+	<name>plg_privacy_contact</name>
+	<author>Joomla! Project</author>
+	<creationDate>2018-07</creationDate>
+	<copyright>(C) 2018 Open Source Matters, Inc.</copyright>
+	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>3.9.0</version>
+	<description>PLG_PRIVACY_CONTACT_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Plugin\Privacy\Contact</namespace>
+	<files>
+		<folder plugin="contact">services</folder>
+		<folder>src</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/plg_privacy_contact.ini</language>
+		<language tag="en-GB">language/en-GB/plg_privacy_contact.sys.ini</language>
+	</languages>
+</extension>

plugins/privacy/contact/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Privacy.contact
+ *
+ * @copyright   (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\PluginInterface;
+use Joomla\CMS\Factory;
+use Joomla\CMS\Plugin\PluginHelper;
+use Joomla\Database\DatabaseInterface;
+use Joomla\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+use Joomla\Event\DispatcherInterface;
+use Joomla\Plugin\Privacy\Contact\Extension\Contact;
+
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   4.4.0
+     */
+    public function register(Container $container): void
+    {
+        $container->set(
+            PluginInterface::class,
+            function (Container $container) {
+                $plugin     = new Contact(
+                    $container->get(DispatcherInterface::class),
+                    (array) PluginHelper::getPlugin('privacy', 'contact')
+                );
+                $plugin->setApplication(Factory::getApplication());
+                $plugin->setDatabase($container->get(DatabaseInterface::class));
+
+                return $plugin;
+            }
+        );
+    }
+};

plugins/privacy/contact/src/Extension/Contact.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  Privacy.contact
+ *
+ * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Plugin\Privacy\Contact\Extension;
+
+use Joomla\CMS\User\User;
+use Joomla\Component\Privacy\Administrator\Plugin\PrivacyPlugin;
+use Joomla\Component\Privacy\Administrator\Table\RequestTable;
+use Joomla\Database\ParameterType;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Privacy plugin managing Joomla user contact data
+ *
+ * @since  3.9.0
+ */
+final class Contact extends PrivacyPlugin
+{
+    /**
+     * Processes an export request for Joomla core user contact data
+     *
+     * This event will collect data for the contact core tables:
+     *
+     * - Contact custom fields
+     *
+     * @param   RequestTable  $request  The request record being processed
+     * @param   User          $user     The user account associated with this request if available
+     *
+     * @return  \Joomla\Component\Privacy\Administrator\Export\Domain[]
+     *
+     * @since   3.9.0
+     */
+    public function onPrivacyExportRequest(RequestTable $request, User $user = null)
+    {
+        if (!$user && !$request->email) {
+            return [];
+        }
+
+        $domains   = [];
+        $domain    = $this->createDomain('user_contact', 'joomla_user_contact_data');
+        $domains[] = $domain;
+        $db        = $this->getDatabase();
+
+        $query = $db->getQuery(true)
+            ->select('*')
+            ->from($db->quoteName('#__contact_details'))
+            ->order($db->quoteName('ordering') . ' ASC');
+
+        if ($user) {
+            $query->where($db->quoteName('user_id') . ' = :id')
+                ->bind(':id', $user->id, ParameterType::INTEGER);
+        } else {
+            $query->where($db->quoteName('email_to') . ' = :email')
+                ->bind(':email', $request->email);
+        }
+
+        $items = $db->setQuery($query)->loadObjectList();
+
+        foreach ($items as $item) {
+            $domain->addItem($this->createItemFromArray((array) $item));
+        }
+
+        $domains[] = $this->createCustomFieldsDomain('com_contact.contact', $items);
+
+        return $domains;
+    }
+}