Issue #3252427: Provide token support for email addresses used by SMTP config

smtp.tokens.inc

+<?php
+
+/**
+ * @file
+ * Builds placeholder replacement tokens for smtp data.
+ *
+ * This file handles tokens for the smtp tokens.
+ */
+
+/**
+ * Implements hook_token_info().
+ */
+function smtp_token_info(): array {
+  $types['smtp'] = [
+    'name' => t("SMTP data"),
+    'description' => t("Tokens for smtp settings."),
+  ];
+  $smtp['from'] = [
+    'name' => t("E-mail from address"),
+    'description' => t("The e-mail address that all e-mails will be from."),
+  ];
+  $smtp['fromname'] = [
+    'name' => t("E-mail from name"),
+    'description' => t("The name that all e-mails will be from."),
+  ];
+  $smtp['username'] = [
+    'name' => t("Username"),
+    'description' => t("SMTP Username."),
+  ];
+  return [
+    'types' => $types,
+    'tokens' => [
+      'smtp' => $smtp,
+    ],
+  ];
+}
+
+/**
+ * Implements hook_tokens().
+ */
+function smtp_tokens($type, $tokens): array {
+  $replacements = [];
+  if ($type === 'smtp') {
+    $config = \Drupal::config('smtp.settings');
+    foreach ($tokens as $name => $original) {
+      switch ($name) {
+        case 'from':
+          $replacements[$original] = $config->get('smtp_from');
+          break;
+
+        case 'fromname':
+          $replacements[$original] = $config->get('smtp_fromname');
+          break;
+
+        case 'username':
+          $replacements[$original] = $config->get('smtp_username');
+          break;
+
+      }
+    }
+  }
+  return $replacements;
+}