chore: rename fundamentals to base (#9119)

packages/backend/server/src/base/mailer/mailer.ts

@@ -0,0 +1,33 @@
+import { FactoryProvider, Logger } from '@nestjs/common';
+import { createTransport, Transporter } from 'nodemailer';
+import SMTPTransport from 'nodemailer/lib/smtp-transport';
+
+import { Config } from '../config';
+
+export const MAILER_SERVICE = Symbol('MAILER_SERVICE');
+
+export type MailerService = Transporter<SMTPTransport.SentMessageInfo>;
+export type Response = SMTPTransport.SentMessageInfo;
+export type Options = SMTPTransport.Options;
+
+export const MAILER: FactoryProvider<
+  Transporter<SMTPTransport.SentMessageInfo> | undefined
+> = {
+  provide: MAILER_SERVICE,
+  useFactory: (config: Config) => {
+    if (config.mailer) {
+      const logger = new Logger('Mailer');
+      const auth = config.mailer.auth;
+      if (auth && auth.user && !('pass' in auth)) {
+        logger.warn(
+          'Mailer service has not configured password, please make sure your mailer service allow empty password.'
+        );
+      }
+
+      return createTransport(config.mailer);
+    } else {
+      return undefined;
+    }
+  },
+  inject: [Config],
+};