Add subscriber eraser for GDPR

[MAILPOET-1359]

lib/Subscribers/SubscriberPersonalDataEraser.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace MailPoet\Subscribers;
+
+use MailPoet\Models\Subscriber;
+use MailPoet\Models\SubscriberCustomField;
+
+class SubscriberPersonalDataEraser {
+
+  function erase($email) {
+    if(empty($email)) {
+      return array(
+        'items_removed' => false,
+        'items_retained' => false,
+        'messages' => array(),
+        'done' => true,
+      );
+    }
+
+    $subscriber = Subscriber::findOne(trim($email));
+    $item_removed = false;
+    $items_retained = true;
+    if($subscriber) {
+      $this->eraseCustomFields($subscriber->id());
+      $this->anonymizeSubscriberData($subscriber);
+      $item_removed = true;
+      $items_retained = false;
+    }
+
+    return array(
+      'items_removed' => $item_removed,
+      'items_retained' => $items_retained,
+      'messages' => array(),
+      'done' => true,
+    );
+  }
+
+  private function eraseCustomFields($subscriber_id) {
+    $custom_fields = SubscriberCustomField::where('subscriber_id', $subscriber_id)->findMany();
+    foreach($custom_fields as $custom_field) {
+      $custom_field->value = '';
+      $custom_field->save();
+    }
+  }
+
+  private function anonymizeSubscriberData($subscriber) {
+    $subscriber->email = sprintf('deleted-%s@site.invalid', uniqid('', true));
+    $subscriber->first_name = 'Anonymous';
+    $subscriber->last_name = 'Anonymous';
+    $subscriber->status = Subscriber::STATUS_UNSUBSCRIBED;
+    $subscriber->subscribed_ip = '0.0.0.0';
+    $subscriber->confirmed_ip = '0.0.0.0';
+    $subscriber->save();
+  }
+
+}