feat(mail): add smtp email delivery

lib/mail/config.ts

@@ -0,0 +1,109 @@
+import { mkdir, readFile, writeFile } from "fs/promises";
+import path from "path";
+import { configDirectory } from "@/lib/runtime/config";
+import type { SmtpSettings } from "@/lib/admin/types";
+import type { PublicSmtpSettings } from "./types";
+
+const smtpConfigFile = path.join(configDirectory, "smtp.json");
+
+const defaultSmtpSettings: SmtpSettings = {
+  host: "",
+  port: "587",
+  username: "",
+  password: "",
+  security: "starttls",
+  fromAddress: "",
+  replyToAddress: "",
+  recipientAddress: "",
+  bccAddress: "",
+};
+
+function text(value: FormDataEntryValue | null) {
+  return typeof value === "string" ? value.trim() : "";
+}
+
+function normalizeSecurity(value: string): SmtpSettings["security"] {
+  if (value === "tls" || value === "none") return value;
+  return "starttls";
+}
+
+async function ensureConfigDirectory() {
+  await mkdir(configDirectory, { recursive: true });
+}
+
+export async function getSmtpSettings(): Promise<SmtpSettings> {
+  await ensureConfigDirectory();
+  try {
+    const file = await readFile(smtpConfigFile, "utf8");
+    return { ...defaultSmtpSettings, ...JSON.parse(file) as SmtpSettings };
+  } catch {
+    return defaultSmtpSettings;
+  }
+}
+
+export function toPublicSmtpSettings(settings: SmtpSettings): PublicSmtpSettings {
+  return {
+    host: settings.host,
+    port: settings.port,
+    username: settings.username,
+    security: settings.security,
+    fromAddress: settings.fromAddress,
+    replyToAddress: settings.replyToAddress,
+    recipientAddress: settings.recipientAddress,
+    bccAddress: settings.bccAddress,
+    lastTestAt: settings.lastTestAt,
+    lastTestStatus: settings.lastTestStatus,
+    lastError: settings.lastError,
+    hasPassword: Boolean(settings.password),
+  };
+}
+
+export function isSmtpConfigured(settings: SmtpSettings) {
+  return Boolean(
+    settings.host &&
+    settings.port &&
+    settings.username &&
+    settings.password &&
+    settings.fromAddress &&
+    settings.recipientAddress,
+  );
+}
+
+export async function saveSmtpSettings(form: FormData) {
+  const current = await getSmtpSettings();
+  const nextPassword = text(form.get("password"));
+  const settings: SmtpSettings = {
+    ...current,
+    host: text(form.get("host")),
+    port: text(form.get("port")) || "587",
+    username: text(form.get("username")),
+    password: nextPassword || current.password || "",
+    security: normalizeSecurity(text(form.get("security"))),
+    fromAddress: text(form.get("fromAddress")),
+    replyToAddress: text(form.get("replyToAddress")),
+    recipientAddress: text(form.get("recipientAddress")),
+    bccAddress: text(form.get("bccAddress")),
+  };
+
+  await ensureConfigDirectory();
+  await writeFile(smtpConfigFile, `${JSON.stringify(settings, null, 2)}\n`, "utf8");
+  return settings;
+}
+
+export async function updateSmtpTestStatus(status: Pick<SmtpSettings, "lastTestAt" | "lastTestStatus" | "lastError">) {
+  const current = await getSmtpSettings();
+  const settings: SmtpSettings = { ...current, ...status };
+  await ensureConfigDirectory();
+  await writeFile(smtpConfigFile, `${JSON.stringify(settings, null, 2)}\n`, "utf8");
+  return settings;
+}
+
+export async function updateSmtpDeliveryStatus(status: Pick<SmtpSettings, "lastDeliveryAt" | "lastDeliveryStatus" | "lastError">) {
+  const current = await getSmtpSettings();
+  const settings: SmtpSettings = { ...current, ...status };
+  await ensureConfigDirectory();
+  await writeFile(smtpConfigFile, `${JSON.stringify(settings, null, 2)}\n`, "utf8");
+  return settings;
+}
+
+export { smtpConfigFile };