// @deno-types="npm:@types/nodemailer"
import nodemailer from 'nodemailer'
import dkim from '../config/dkim.json' with { type: 'json' }

export async function transporter() {
	const dkimPath = dkim.privateKey
	const dkimPrivateKey = await Deno.readTextFile(dkimPath).catch((cause) => {
		throw new Error(`unable to load DKIM private key from "${dkimPath}"`, {
			cause,
		})
	})

	return nodemailer.createTransport({
		sendmail: true,
		newline: 'unix',
		path: '/usr/sbin/sendmail',
		dkim: {
			domainName: dkim.domainName,
			keySelector: dkim.keySelector,
			privateKey: dkimPrivateKey,
		},
	})
}