server/src/EmailService.ts

import htmlToText from 'html-to-text'
import nodemailer from 'nodemailer'
import fs from 'fs'
import twig from 'twig'

export default class EmailService {
  static getTransporter() {
    if (process.env.SMTP_HOST == undefined || process.env.SMTP_PORT == undefined) {
      throw new Error("Invalid SMTP config")
    }
    const config: any = {
      host: process.env.SMTP_HOST,
      port: parseInt(process.env.SMTP_PORT),
      secure: process.env.SMTP_SECURE == 'true',
      auth: {
        user: process.env.SMTP_USERNAME,
        pass: process.env.SMTP_PASSWORD,
      }
    }
    console.log(config)
    return nodemailer.createTransport(config)
  }

  static send(to: string, subject: string, templateName: string, templateParams: any): Promise<any> {
    const viewPath: string = __dirname + '/../views/emails/'
    const data: Buffer = fs.readFileSync(viewPath + templateName + '.twig')
    const html: string = twig.twig({ data: data.toString() }).render(templateParams)
    const text: string = htmlToText.fromString(html, { wordwrap: 130 })
    
    // for now replace every email by a predefined one
    console.info(to + ' replaced')
    to = "spamfree@matthieubessat.fr"

    return new Promise((resolve, reject) => {
      const config: any = {
        from: '"Forum des associations - Espace Condorcet Centre Social" <ne-pas-repondre@espacecondorcet.org>',
        to, subject, text, html
      }
      console.log(config.html)
      this.getTransporter().sendMail(config).then(info => {
        console.log(info)
        resolve()
      }).catch(err => {
        console.log(err)
        reject()
      })
    })
  }
}