I currently have a nestjs application with a POST /email endpoint that utilizes nodemailer to send emails based on handlebar templates. The template used depends on the selection made in the API call (template=xxx).
For example,
http://localhost:3000/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="93f6fef2fafface7fcaee7f6e0e7d3f4fef2faffbdf0fcfe">[email protected]</a>&name=John&template=email2Currently, these handlebar templates are stored statically in a folder named ./templates. However, I am looking to load these templates from a remote location such as an S3 bucket instead. This change would allow me to easily add, edit, and delete templates as needed.
The proposed process is outlined in the following sequence diagram:
https://i.stack.imgur.com/5p0ZD.png
Is it possible to achieve this setup? Are there alternative approaches that could be considered?
The existing NestJs configuration is quite simple and is based on the guidelines provided in this tutorial here. The static handlebar templates are located in the src/template folder.
// app.module.ts
@Module({
imports: [
ConfigModule.forRoot(),
MailerModule.forRootAsync({
imports: [ConfigModule],
useFactory: async (config: ConfigService) => {
return {
transport: {
host: config.get('EMAIL_HOST'),
secure: false,
auth: {
user: config.get('EMAIL_USER'),
pass: config.get('EMAIL_PASSWORD'),
},
},
defaults: {
from: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="3851565e57784c5d4b4c165c5d">[email protected]</a>',
},
template: {
dir: join(__dirname, './templates'),
adapter: new HandlebarsAdapter(),
options: {
strict: true,
},
},
};
},
inject: [ConfigService],
}),
],
controllers: [AppController],
providers: [AppService],
})
export class AppModule {}
// app.controller.ts
@Controller()
export class AppController {
constructor(private mailerService: MailerService) {}
@Post('/email')
async getHello(
@Query('to') to: string,
@Query('name') name: string,
@Query('template') template: string,
): Promise<SentMessageInfo> {
const info = await this.mailerService.sendMail({
to,
subject: 'Greeting from NestJS NodeMailer',
template,
context: {
name,
},
});
console.log('Preview URL: %s', getTestMessageUrl(info));
}