Add customer accounts: login, signup, reset, activate, orders

- Storefront customer operations in graphql/customer.js and a server-safe
  services/shopify/customer.ts
- Session held in an httpOnly, sameSite=lax cookie set by the
  /api/account handlers; the access token never reaches client JS
- Pages: /account/login, /register, /recover, /reset/[id]/[token] and
  /activate/[id]/[token] for Shopify's emailed links
- /account renders order history as master-detail on one screen, since
  the Storefront API has no standalone order-by-id query for customers
- Header user icon: links to sign-in when signed out, otherwise a menu
  with name, email, order history, and sign out
- Login errors are collapsed and password recovery responds identically
  for known and unknown emails, so neither form enumerates accounts

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jWbNNJLksC1QG8z8845FX

app/api/account/activate/route.ts

@@ -0,0 +1,30 @@
+import {
+  activateAccount,
+  toCustomerGid,
+  customerErrorMessage,
+} from '@/services/shopify/customer';
+import { setSessionToken } from '@/services/shopify/session';
+
+export async function POST(req: Request) {
+  const { id, activationToken, password } = await req.json();
+
+  if (!id || !activationToken || !password) {
+    return Response.json(
+      { error: 'This activation link is incomplete.' },
+      { status: 400 }
+    );
+  }
+
+  const { token, errors } = await activateAccount(
+    toCustomerGid(id),
+    activationToken,
+    password
+  );
+
+  if (!token) {
+    return Response.json({ error: customerErrorMessage(errors) }, { status: 400 });
+  }
+
+  await setSessionToken(token.accessToken, token.expiresAt);
+  return Response.json({ ok: true });
+}

app/api/account/login/route.ts

@@ -0,0 +1,31 @@
+import { login, customerErrorMessage } from '@/services/shopify/customer';
+import { setSessionToken } from '@/services/shopify/session';
+
+export async function POST(req: Request) {
+  const { email, password } = await req.json();
+
+  if (!email || !password) {
+    return Response.json(
+      { error: 'Enter your email and password.' },
+      { status: 400 }
+    );
+  }
+
+  const { token, errors } = await login(email, password);
+
+  if (!token) {
+    // Shopify distinguishes wrong-password from unknown-email; collapse both so
+    // the form can't be used to enumerate accounts.
+    return Response.json(
+      {
+        error: errors.length
+          ? 'Incorrect email or password.'
+          : customerErrorMessage(errors),
+      },
+      { status: 401 }
+    );
+  }
+
+  await setSessionToken(token.accessToken, token.expiresAt);
+  return Response.json({ ok: true });
+}

app/api/account/logout/route.ts

@@ -0,0 +1,10 @@
+import { logout } from '@/services/shopify/customer';
+import { getSessionToken, clearSessionToken } from '@/services/shopify/session';
+
+export async function POST() {
+  const token = await getSessionToken();
+  if (token) await logout(token);
+
+  await clearSessionToken();
+  return Response.json({ ok: true });
+}

app/api/account/me/route.ts

@@ -0,0 +1,19 @@
+import { getSessionToken } from '@/services/shopify/session';
+import { getCustomer } from '@/services/shopify/customer';
+
+// Minimal session probe for the header menu — never returns the access token.
+export async function GET() {
+  const token = await getSessionToken();
+  if (!token) return Response.json({ customer: null });
+
+  const customer = await getCustomer(token, 0);
+  if (!customer) return Response.json({ customer: null });
+
+  return Response.json({
+    customer: {
+      displayName: customer.displayName,
+      email: customer.email,
+      firstName: customer.firstName,
+    },
+  });
+}

app/api/account/recover/route.ts

@@ -0,0 +1,10 @@
+import { recoverPassword } from '@/services/shopify/customer';
+
+export async function POST(req: Request) {
+  const { email } = await req.json();
+
+  if (email) await recoverPassword(email);
+
+  // Always the same response, so the form can't reveal who has an account.
+  return Response.json({ ok: true });
+}

app/api/account/register/route.ts

@@ -0,0 +1,39 @@
+import {
+  createCustomer,
+  login,
+  customerErrorMessage,
+} from '@/services/shopify/customer';
+import { setSessionToken } from '@/services/shopify/session';
+
+export async function POST(req: Request) {
+  const { email, password, firstName, lastName } = await req.json();
+
+  if (!email || !password) {
+    return Response.json(
+      { error: 'Enter your email and password.' },
+      { status: 400 }
+    );
+  }
+
+  const { errors } = await createCustomer({
+    email,
+    password,
+    firstName,
+    lastName,
+  });
+
+  if (errors.length) {
+    return Response.json({ error: customerErrorMessage(errors) }, { status: 400 });
+  }
+
+  // Sign the new customer straight in. Accounts needing email confirmation
+  // won't return a token yet, which is not an error.
+  const { token } = await login(email, password);
+
+  if (token) {
+    await setSessionToken(token.accessToken, token.expiresAt);
+    return Response.json({ ok: true, signedIn: true });
+  }
+
+  return Response.json({ ok: true, signedIn: false });
+}

app/api/account/reset/route.ts

@@ -0,0 +1,27 @@
+import {
+  resetPassword,
+  toCustomerGid,
+  customerErrorMessage,
+} from '@/services/shopify/customer';
+import { setSessionToken } from '@/services/shopify/session';
+
+export async function POST(req: Request) {
+  const { id, resetToken, password } = await req.json();
+
+  if (!id || !resetToken || !password) {
+    return Response.json({ error: 'This reset link is incomplete.' }, { status: 400 });
+  }
+
+  const { token, errors } = await resetPassword(
+    toCustomerGid(id),
+    resetToken,
+    password
+  );
+
+  if (!token) {
+    return Response.json({ error: customerErrorMessage(errors) }, { status: 400 });
+  }
+
+  await setSessionToken(token.accessToken, token.expiresAt);
+  return Response.json({ ok: true });
+}