Phase6: Customer Billing details

src/app/api/settings/billing/route.ts

@@ -0,0 +1,85 @@
+import { NextResponse } from "next/server";
+import { z } from "zod";
+import { getSessionUser } from "@/lib/session";
+import { getOrgBilling, upsertOrgBilling } from "@/lib/db";
+
+/**
+ * GET /api/settings/billing — read the caller's org_billing row.
+ * Returns null if the org hasn't configured billing yet — the
+ * form renders empty and the PUT will create on first save.
+ *
+ * PUT /api/settings/billing — upsert the row.
+ *
+ * Authorization: caller must have role "owner" in their org.
+ * Non-owners get 403 (they shouldn't have reached the page UI
+ * anyway, which hides the link, but the API enforces too — a
+ * non-owner who hits this directly with curl gets refused).
+ *
+ * Personal accounts are inherently their own owner (single-user
+ * org), so user.roles.includes("owner") returns true and they
+ * can manage their own billing.
+ */
+
+const upsertSchema = z.object({
+  companyName: z.string().trim().min(1).max(200),
+  streetAddress: z.string().trim().min(1).max(200),
+  postalCode: z.string().trim().min(1).max(20),
+  city: z.string().trim().min(1).max(100),
+  // ISO 3166-1 alpha-2. We normalise to uppercase server-side.
+  country: z
+    .string()
+    .trim()
+    .length(2)
+    .regex(/^[A-Za-z]{2}$/, "Use a 2-letter ISO country code (CH, DE, …)"),
+  vatNumber: z.string().trim().max(40).optional().nullable(),
+  billingEmail: z.string().trim().email().max(200),
+  notes: z.string().trim().max(2000).optional().nullable(),
+});
+
+function requireOwner(user: { roles: string[] } | null) {
+  if (!user) return false;
+  return user.roles.includes("owner");
+}
+
+export async function GET() {
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  if (!requireOwner(user as any)) {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  const billing = await getOrgBilling(user.orgId);
+  return NextResponse.json({ billing });
+}
+
+export async function PUT(request: Request) {
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  if (!requireOwner(user as any)) {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+  const body = await request.json().catch(() => ({}));
+  const parsed = upsertSchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid request", details: parsed.error.flatten() },
+      { status: 400 }
+    );
+  }
+  const data = parsed.data;
+  const billing = await upsertOrgBilling({
+    zitadelOrgId: user.orgId,
+    companyName: data.companyName,
+    streetAddress: data.streetAddress,
+    postalCode: data.postalCode,
+    city: data.city,
+    country: data.country.toUpperCase(),
+    vatNumber: data.vatNumber ?? null,
+    billingEmail: data.billingEmail,
+    notes: data.notes ?? null,
+  });
+  return NextResponse.json({ billing });
+}