Initial commit

apps/backend/src/lib/mailer.ts

@@ -0,0 +1,51 @@
+import nodemailer from 'nodemailer'
+
+let cachedTransporter: ReturnType<typeof nodemailer.createTransport> | null = null
+
+function getTransporter() {
+  if (cachedTransporter) return cachedTransporter
+
+  const smtpHost = Bun.env.SMTP_HOST
+  const smtpPort = Number(Bun.env.SMTP_PORT ?? 587)
+  const smtpUser = Bun.env.SMTP_USER
+  const smtpPass = Bun.env.SMTP_PASS
+
+  if (!smtpHost || !smtpUser || !smtpPass) {
+    throw new Error(
+      'Missing SMTP env vars. Set SMTP_HOST, SMTP_PORT, SMTP_USER and SMTP_PASS.',
+    )
+  }
+
+  cachedTransporter = nodemailer.createTransport({
+    host: smtpHost,
+    port: smtpPort,
+    secure: smtpPort === 465,
+    auth: {
+      user: smtpUser,
+      pass: smtpPass,
+    },
+  })
+
+  return cachedTransporter
+}
+
+export async function sendMail(input: {
+  to: string
+  subject: string
+  html: string
+  text: string
+}) {
+  const smtpFrom = Bun.env.SMTP_FROM
+
+  if (!smtpFrom) {
+    throw new Error('Missing SMTP_FROM env var.')
+  }
+
+  await getTransporter().sendMail({
+    from: smtpFrom,
+    to: input.to,
+    subject: input.subject,
+    html: input.html,
+    text: input.text,
+  })
+}