feat(chore): lazy load dkim key

src/send.ts

@@ -5,7 +5,7 @@ import { transporter } from './transporter.ts'
 export async function send(mail: Mail) {
 	const { html, text } = await renderTemplate(mail.body)
 
-	return transporter.sendMail({
+	return (await transporter()).sendMail({
 		from: mail.from.toString(),
 		to: mail.to.map((contact) => contact.toString()),
 		cc: mail.options.cc.map((cc) => cc.toString()),

src/transporter.ts

@@ -1,20 +1,23 @@
 // @deno-types="npm:@types/nodemailer"
 import nodemailer from 'nodemailer'
 
-const dkimPath = '/home/julien/dkim_sendmail_keys/dkim_sendmail_cohabit_fr.pem'
-const dkimPrivateKey = await Deno.readTextFile(dkimPath).catch((cause) => {
-	throw new Error(`unable to load DKIM private key from "${dkimPath}"`, {
-		cause,
+export async function transporter() {
+	const dkimPath =
+		'/home/julien/dkim_sendmail_keys/dkim_sendmail_cohabit_fr.pem'
+	const dkimPrivateKey = await Deno.readTextFile(dkimPath).catch((cause) => {
+		throw new Error(`unable to load DKIM private key from "${dkimPath}"`, {
+			cause,
+		})
 	})
-})
 
-export const transporter = nodemailer.createTransport({
-	sendmail: true,
-	newline: 'unix',
-	path: '/usr/sbin/sendmail',
-	dkim: {
-		domainName: 'cohabit.fr',
-		keySelector: 'sendmailY2024M03',
-		privateKey: dkimPrivateKey,
-	},
-})
+	return nodemailer.createTransport({
+		sendmail: true,
+		newline: 'unix',
+		path: '/usr/sbin/sendmail',
+		dkim: {
+			domainName: 'cohabit.fr',
+			keySelector: 'sendmailY2024M03',
+			privateKey: dkimPrivateKey,
+		},
+	})
+}