Add SMTP admin settings and contact form delivery

app/root/smtp/contact-protection/actions.ts

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+"use server";
+
+import { revalidatePath } from "next/cache";
+import { redirect } from "next/navigation";
+import { isRedirectError } from "next/dist/client/components/redirect";
+
+import { clearAdminSessionCookie, isAdminAuthenticated } from "@/lib/admin-auth";
+import {
+  getContactProtectionSettings,
+  updateContactProtectionSettings,
+} from "@/lib/app-config";
+import type { ContactProtectionSettings } from "@/lib/contact-protection";
+
+function ensureAdmin() {
+  if (!isAdminAuthenticated()) {
+    clearAdminSessionCookie();
+    redirect("/root");
+  }
+}
+
+function withMessage(pathname: string, type: "success" | "error", message: string) {
+  const params = new URLSearchParams();
+  params.set(type, message);
+
+  return `${pathname}?${params.toString()}`;
+}
+
+function parseCount(value: string, fallback: number, label: string) {
+  const parsed = Number.parseInt(value || String(fallback), 10);
+
+  if (!Number.isInteger(parsed) || parsed <= 0) {
+    throw new Error(`${label} must be a positive number.`);
+  }
+
+  return parsed;
+}
+
+function parseContactProtectionFormData(
+  formData: FormData,
+  existingSettings: ContactProtectionSettings,
+): ContactProtectionSettings {
+  const turnstileEnabled = formData.get("turnstileEnabled") === "on";
+  const turnstileSiteKey = String(formData.get("turnstileSiteKey") ?? "").trim();
+  const turnstileSecretKey = String(formData.get("turnstileSecretKey") ?? "");
+  const rateLimitEnabled = formData.get("contactRateLimitEnabled") === "on";
+
+  if (turnstileEnabled && !turnstileSiteKey) {
+    throw new Error("Turnstile site key is required when Turnstile is enabled.");
+  }
+
+  if (turnstileEnabled && !turnstileSecretKey.trim() && !existingSettings.turnstile.secretKey) {
+    throw new Error("Turnstile secret key is required when Turnstile is enabled.");
+  }
+
+  return {
+    turnstile: {
+      enabled: turnstileEnabled,
+      siteKey: turnstileSiteKey,
+      secretKey: turnstileSecretKey.trim()
+        ? turnstileSecretKey
+        : existingSettings.turnstile.secretKey,
+    },
+    rateLimit: {
+      enabled: rateLimitEnabled,
+      maxRequests: parseCount(
+        String(formData.get("contactRateLimitMaxRequests") ?? ""),
+        existingSettings.rateLimit.maxRequests,
+        "Rate limit max requests",
+      ),
+      windowMinutes: parseCount(
+        String(formData.get("contactRateLimitWindowMinutes") ?? ""),
+        existingSettings.rateLimit.windowMinutes,
+        "Rate limit window minutes",
+      ),
+    },
+  };
+}
+
+export async function saveContactProtectionSettingsAction(formData: FormData) {
+  ensureAdmin();
+
+  try {
+    const existingSettings = await getContactProtectionSettings();
+    const nextSettings = parseContactProtectionFormData(formData, existingSettings);
+
+    await updateContactProtectionSettings(nextSettings);
+    revalidatePath("/root/smtp/contact-protection");
+    revalidatePath("/contact");
+    revalidatePath("/ar/contact");
+    revalidatePath("/en/contact");
+    redirect(
+      withMessage(
+        "/root/smtp/contact-protection",
+        "success",
+        "Contact Protection gespeichert.",
+      ),
+    );
+  } catch (error) {
+    if (isRedirectError(error)) {
+      throw error;
+    }
+
+    const message =
+      error instanceof Error
+        ? error.message
+        : "Contact Protection konnte nicht gespeichert werden.";
+
+    redirect(withMessage("/root/smtp/contact-protection", "error", message));
+  }
+}

app/root/smtp/contact-protection/page.tsx

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+import { redirect } from "next/navigation";
+
+import { MotionFade } from "@/components/motion-fade";
+import { ContactProtectionForm } from "@/components/root/contact-protection-form";
+import { FlashMessage } from "@/components/root/flash-message";
+import { RootDashboardShell } from "@/components/root/root-dashboard-shell";
+import { clearAdminSessionCookie, isAdminAuthenticated } from "@/lib/admin-auth";
+import { getContactProtectionFormValues } from "@/lib/app-config";
+
+import { saveContactProtectionSettingsAction } from "./actions";
+
+export const dynamic = "force-dynamic";
+
+const copy = {
+  title: "Contact Protection",
+  subtitle: "Turnstile und Rate Limiting fuer das Kontaktformular.",
+  overview: "Uebersicht",
+  maintenance: "Wartungsmodus",
+  uiKit: "UI Kit",
+  media: "Media",
+  siteSettings: "SEO",
+  smtp: "SMTP",
+  contactProtection: "Contact Protection",
+  portfolio: "Portfolio",
+  logout: "Ausloggen",
+  backToSite: "Zur Website",
+};
+
+type RootSMTPProtectionPageProps = {
+  searchParams?: {
+    success?: string;
+    error?: string;
+  };
+};
+
+export default async function RootSMTPProtectionPage({
+  searchParams,
+}: RootSMTPProtectionPageProps) {
+  if (!isAdminAuthenticated()) {
+    redirect("/root");
+  }
+
+  async function logoutAction() {
+    "use server";
+
+    clearAdminSessionCookie();
+    redirect("/root");
+  }
+
+  const settings = await getContactProtectionFormValues();
+
+  return (
+    <RootDashboardShell
+      copy={copy}
+      active="smtp"
+      smtpChild="contact-protection"
+      logoutAction={logoutAction}
+      headerTitle={copy.title}
+      headerDescription={copy.subtitle}
+      saveFormId="contact-protection-form"
+      reloadDocumentOnSave
+    >
+      <div className="space-y-6">
+        {searchParams?.success ? (
+          <MotionFade delay={0.1}>
+            <FlashMessage type="success" message={searchParams.success} />
+          </MotionFade>
+        ) : null}
+
+        {searchParams?.error ? (
+          <MotionFade delay={0.12}>
+            <FlashMessage type="error" message={searchParams.error} />
+          </MotionFade>
+        ) : null}
+
+        <MotionFade delay={0.16}>
+          <ContactProtectionForm
+            action={saveContactProtectionSettingsAction}
+            initialSettings={settings}
+          />
+        </MotionFade>
+      </div>
+    </RootDashboardShell>
+  );
+}