Billing rework

src/app/api/billing/route.ts

@@ -0,0 +1,128 @@
+import { NextRequest, NextResponse } from "next/server";
+import { z } from "zod";
+import { getSessionUser, canMutate } from "@/lib/session";
+import { getOrgBilling, upsertOrgBilling } from "@/lib/db";
+import { safeError } from "@/lib/errors";
+
+/**
+ * Org-scoped billing API (Bug 35).
+ *
+ * GET — return the current billing record for the caller's org, or
+ * 404 if none has been captured yet. The /settings/billing page
+ * renders an empty form on 404 (first-time edit) and a pre-filled
+ * form on 200.
+ *
+ * PUT — upsert the billing record. Required for any subsequent tenant
+ * provisioning unless the caller is on a personal org. Validation:
+ *   - All address fields required.
+ *   - VAT number required for company orgs (where `user.isPersonal`
+ *     is false). Optional for personal orgs.
+ *   - billing_email validated as RFC-5322-ish.
+ *
+ * Authorization:
+ *   - GET: any authenticated user in the org. We expose only their
+ *     own org's billing — orgId is scoped from the session.
+ *   - PUT: owners and platform admins (canMutate check). Customers
+ *     in `user` role cannot edit billing.
+ */
+
+const billingSchema = z.object({
+  companyName: z.string().min(1).max(200),
+  streetAddress: z.string().min(1).max(200),
+  postalCode: z.string().min(1).max(20),
+  city: z.string().min(1).max(100),
+  country: z.string().min(2).max(3), // ISO 3166-1 alpha-2 or alpha-3
+  vatNumber: z
+    .string()
+    .max(50)
+    .nullable()
+    .optional()
+    .transform((v) => (v && v.trim() !== "" ? v.trim() : null)),
+  billingEmail: z.string().email().max(200),
+  notes: z
+    .string()
+    .max(2000)
+    .nullable()
+    .optional()
+    .transform((v) => (v && v.trim() !== "" ? v.trim() : null)),
+});
+
+export async function GET() {
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  const billing = await getOrgBilling(user.orgId);
+  if (!billing) {
+    // 404 carries semantic meaning here — "no record yet". Callers
+    // (settings page, wizard) treat this as the empty-form state.
+    return NextResponse.json(
+      { error: "No billing record for this org" },
+      { status: 404 }
+    );
+  }
+  return NextResponse.json({ billing });
+}
+
+export async function PUT(req: NextRequest) {
+  const user = await getSessionUser();
+  if (!user) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+  if (!canMutate(user)) {
+    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
+  }
+
+  const body = await req.json().catch(() => null);
+  const parsed = billingSchema.safeParse(body);
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: "Invalid input", details: parsed.error.flatten() },
+      { status: 400 }
+    );
+  }
+
+  // Company orgs (B2B) require companyName AND VAT. Personal orgs
+  // (B2C — private individuals) need neither; their /settings/billing
+  // form hides both fields and we don't ask the API to enforce them.
+  if (!user.isPersonal) {
+    const missing: Record<string, string[]> = {};
+    if (!parsed.data.companyName || parsed.data.companyName.trim().length === 0) {
+      missing.companyName = ["Required for companies"];
+    }
+    if (!parsed.data.vatNumber) {
+      missing.vatNumber = ["Required for companies"];
+    }
+    if (Object.keys(missing).length > 0) {
+      return NextResponse.json(
+        {
+          error:
+            "Company name and VAT number are required for company accounts.",
+          details: { fieldErrors: missing },
+        },
+        { status: 400 }
+      );
+    }
+  }
+
+  try {
+    const billing = await upsertOrgBilling({
+      zitadelOrgId: user.orgId,
+      companyName: parsed.data.companyName,
+      streetAddress: parsed.data.streetAddress,
+      postalCode: parsed.data.postalCode,
+      city: parsed.data.city,
+      country: parsed.data.country,
+      vatNumber: parsed.data.vatNumber,
+      billingEmail: parsed.data.billingEmail,
+      notes: parsed.data.notes,
+    });
+    return NextResponse.json({ billing });
+  } catch (e: any) {
+    console.error("Failed to upsert org billing:", e);
+    return NextResponse.json(
+      { error: safeError(e, "Failed to save billing") },
+      { status: 500 }
+    );
+  }
+}