mail.worker.ts

const nodemailer = require('nodemailer')
import * as functions from 'firebase-functions'
import { User } from '../../types/User.type'
import { MoodController } from '../mood.controller'
import { StorageController } from '../storage.controller'
import { ZeebeController } from '../zeebe.controller'

const PORT = 465

export class MailWorkerController {
  constructor(
    private zeebeController: ZeebeController,
    private store: StorageController,
  ) {}

  public createWorker(taskType: string) {
    this.zeebeController.getZeebeClient().createWorker({
      taskType,
      taskHandler: async (job: any, complete: any, worker: any) => {
        const user: User = {
          name: job.customHeaders.name,
          email: job.customHeaders.email,
          team: job.customHeaders.team,
        }
        try {
          await this.sendMail(user)
          complete.success()
        } catch (error) {
          complete.failure('Failed to send email')
        }
      },
    })
  }

  private async sendMail(user: User) {
    const smtpUser = functions.config().email.user
    const smtpPass = functions.config().email.pass
    const smtpHost = functions.config().email.host
    const baseUrl = functions.config().email.baseurl
    
    const transporter = nodemailer.createTransport({
      host: smtpHost,
      port: PORT,
      secure: true,
      auth: {
        user: smtpUser,
        pass: smtpPass,
      },
    })

    const subject = `How are you today?`

    const moodController = new MoodController(this.store)
    const moodRequest = moodController.createRequest(user)

    await Promise.all([
      moodController.saveMoodRequest(moodRequest),
      transporter.sendMail({
        from: `"Adam" <zeebe@urbanisierung.dev>`,
        to: user.email,
        subject,
        text: `Please consider a modern email client.`,
        html: this.createEmailHtml(user, baseUrl, moodRequest.uuid),
      }),
    ])
  }

  private createEmailHtml(user: User, baseUrl: string, moodId: string) {
    let html = `<p>Hello ${user.name},</p>
    <p>How do you feel about your day today?</p>
    <p>Please click in the term which better describes your day:</p>
    <ul>
      <li><a href="${baseUrl}/mood/${moodId}/5">Excellent day</a></li>
      <li><a href="${baseUrl}/mood/${moodId}/4">Good day</a></li>
      <li><a href="${baseUrl}/mood/${moodId}/3">Average day</a></li>
      <li><a href="${baseUrl}/mood/${moodId}/2">Hard day</a></li>
      <li><a href="${baseUrl}/mood/${moodId}/1">Bad day</a></li>
    </ul>
    <p>By giving your today's feeling, you'll be able to see the average mood of your teammates.</p>
    <p>Cheers,</p>
    <p>Adam</p>
    `
    return html
  }
}