Add SMTP admin settings and contact form delivery

lib/mail.ts

@@ -0,0 +1,172 @@
+import nodemailer, { type SendMailOptions } from "nodemailer";
+
+import { getMailSettings } from "@/lib/app-config";
+import type { AppLocale } from "@/lib/locale";
+import type { MailSettings } from "@/lib/mail-settings";
+
+type MailTransportOptions = {
+  host: string;
+  port: number;
+  secure: boolean;
+  auth: {
+    user: string;
+    pass: string;
+  };
+};
+
+type MailTransport = {
+  sendMail: (options: SendMailOptions) => Promise<unknown>;
+};
+
+type CreateTransport = (options: MailTransportOptions) => MailTransport;
+
+type SendMailDeps = {
+  settings?: MailSettings;
+  createTransport?: CreateTransport;
+};
+
+type SendMailInput = {
+  to: string;
+  subject: string;
+  text: string;
+  replyTo?: string;
+};
+
+type ContactMessageInput = {
+  name: string;
+  email: string;
+  phone?: string;
+  company?: string;
+  message: string;
+  locale: AppLocale;
+};
+
+function requireValue(value: string, message: string) {
+  if (!value.trim()) {
+    throw new Error(message);
+  }
+
+  return value.trim();
+}
+
+function getConfiguredTransportSettings(settings: MailSettings) {
+  const smtpHost = requireValue(settings.smtp.host, "SMTP host is required.");
+  const smtpUsername = requireValue(settings.smtp.username, "SMTP username is required.");
+  const smtpPassword = requireValue(settings.smtp.password, "SMTP password is required.");
+  const fromEmail = requireValue(settings.sender.email, "From email is required.");
+
+  return {
+    smtpHost,
+    smtpUsername,
+    smtpPassword,
+    fromEmail,
+  };
+}
+
+function getConfiguredRecipient(settings: MailSettings, recipientKey: "contact" | "test") {
+  if (recipientKey === "contact") {
+    return requireValue(
+      settings.recipients.contact || settings.recipients.test,
+      "Contact recipient email is required.",
+    );
+  }
+
+  return requireValue(
+    settings.recipients.test || settings.recipients.contact,
+    "Test recipient email is required.",
+  );
+}
+
+export function createSmtpTransport(
+  settings: MailSettings,
+  createTransport: CreateTransport = nodemailer.createTransport,
+) {
+  const { smtpHost, smtpUsername, smtpPassword } = getConfiguredTransportSettings(settings);
+
+  return createTransport({
+    host: smtpHost,
+    port: settings.smtp.port,
+    secure: settings.smtp.secure,
+    auth: {
+      user: smtpUsername,
+      pass: smtpPassword,
+    },
+  });
+}
+
+export async function sendMail(
+  input: SendMailInput,
+  deps: SendMailDeps = {},
+) {
+  const settings = deps.settings ?? await getMailSettings();
+  const { fromEmail } = getConfiguredTransportSettings(settings);
+  const transport = createSmtpTransport(settings, deps.createTransport);
+
+  await transport.sendMail({
+    from: settings.sender.name ? `${settings.sender.name} <${fromEmail}>` : fromEmail,
+    to: input.to,
+    subject: input.subject,
+    text: input.text,
+    replyTo: input.replyTo,
+  });
+}
+
+export async function sendContactMessage(
+  input: ContactMessageInput,
+  deps: SendMailDeps = {},
+) {
+  const settings = deps.settings ?? await getMailSettings();
+  const recipient = getConfiguredRecipient(settings, "contact");
+
+  await sendMail(
+    {
+      to: recipient,
+      subject: "New contact message",
+      replyTo: input.email,
+      text: [
+        "A new contact message was submitted.",
+        "",
+        `Name: ${input.name}`,
+        `Email: ${input.email}`,
+        `Phone: ${input.phone?.trim() || "-"}`,
+        `Company: ${input.company?.trim() || "-"}`,
+        `Locale: ${input.locale}`,
+        `Submitted at: ${new Date().toISOString()}`,
+        "",
+        "Message:",
+        input.message,
+      ].join("\n"),
+    },
+    {
+      settings,
+      createTransport: deps.createTransport,
+    },
+  );
+}
+
+export async function sendTestEmail(
+  deps: SendMailDeps = {},
+) {
+  const settings = deps.settings ?? await getMailSettings();
+  const recipient = getConfiguredRecipient(settings, "test");
+  const { fromEmail } = getConfiguredTransportSettings(settings);
+
+  await sendMail(
+    {
+      to: recipient,
+      subject: "SMTP test email",
+      text: [
+        "This is a backend SMTP test email.",
+        "",
+        `Timestamp: ${new Date().toISOString()}`,
+        `Configured from email: ${fromEmail}`,
+        `Configured recipient: ${recipient}`,
+        `Environment: ${process.env.NODE_ENV ?? "development"}`,
+      ].join("\n"),
+    },
+    {
+      settings,
+      createTransport: deps.createTransport,
+    },
+  );
+}