[mm-grade=A] DC-058: Stripe license + invoice email automation
[mm-grade=A] (MiniMax-M3 adversarial review, 3 rounds) Codex quota exhausted 2026-08-19 21:26 UTC. Per codex-as-judge skill Pitfall XXI, MiniMax-M3 served as adversarial judge via delegate_task across 3 rounds. Final grade: A. No blocking defects remaining. Round 1 (initial: C — 14 issues): CRITICAL/HIGH fixed: 1. Layer-2 delivery idempotency (different event + same session) 2. Mislabeled idempotency test (#2 was layer-1 not layer-2) 3. CRLF test was vacuous (regex matched space-after-colon) 4. Currency: native symbols for EUR/GBP/JPY/etc, ISO code fallback 5. PDF graceful degradation on poison-pill inputs 6. Retry uses claim.createdAt as stable issuedAt Round 2 (B → C again, found new issues): CRITICAL fixed: 1. amountCents accepted string/NaN/Infinity/negative → rendered $0.00 silently (financial-document bug) 2. CRLF test still vacuous — rewrote with no-space-after-colon payloads + per-region extraction. Mutation-tested: deleting stripControlChars → test FAILS. 3. Multi-line-item sum (was lineItems[0] only) Plus: supportUrl scheme allowlist, long-code PDF wrap, currency sanitization, catalog fallback, unbalanced PDF save/restore fix. Round 3 (B → A−, found ONE remaining defect): MED fixed: - PDF Info Subject field echoed raw customerName → phishing-recon signal visible in every PDF readers Properties panel. Now constant. - PDF body Bill To had raw <script> visible (no XSS but phishing). Added escapePdfText() that converts <> → ‹› (visually similar, not HTML-exploitable). Polish: - Bridge wiring: claim.createdAt as issuedAt, DASHCADDY_SUPPORT_URL env - Long license codes auto-shrink font in PDF box (13/11/9/7pt tiers) - Two-page PDF with empty page 2 (PDFKit pagination boundary) Test counts: - 131/131 billing pass (was 119 before) - 1836/1837 full api suite (1 pre-existing public-routes drift unrelated) When Codex quota returns 2026-08-19 21:26 UTC, re-run judge-artifact.sh for the canonical verdict and supersede [mm-grade=A] if needed.
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Hermes
@@ -520,3 +520,221 @@ describe('stripe-license-bridge constants', () => {
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expect(bridge.DELIVERY_LEASE_MS).toBeGreaterThan(0);
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});
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});
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describe('stripe-license-bridge invoice + email rendering (DC-058)', () => {
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// These tests verify the bridge actually invokes the invoice renderer
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// with the right inputs and that the SMTP send receives a multipart
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// body + a PDF attachment. Pairs with invoice.test.js (which tests the
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// rendering primitives in isolation).
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test('passes customerName, sessionId, and amount through to the renderer', async () => {
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const sendMailMock = jest.fn().mockResolvedValue({ messageId: 'test' });
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injectSmtp(sendMailMock);
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process.env.SMTP_HOST = 'smtp.test';
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process.env.SMTP_FROM = 'billing@dashcaddy.test';
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const event = buildSessionEvent({
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productId: 'pro-90d',
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customerEmail: 'alice@example.com',
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});
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// Add customer_details.name + amount_total in line_items[0] (like real Stripe).
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event.data.object.customer_details.name = 'Alice Johnson';
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event.data.object.line_items = {
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data: [{ amount_total: 5000, price: { id: 'price_90d_test', unit_amount: 5000 }, currency: 'usd' }],
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};
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const { rawBody, signatureHeader } = buildSignedPayload(event);
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const result = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(result.status).toBe(200);
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expect(result.body.delivered).toBe(true);
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expect(result.body.deliveredVia).toBe('smtp');
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// Verify the SMTP send was called with branded email + PDF attachment.
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expect(sendMailMock).toHaveBeenCalledTimes(1);
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const mailArgs = sendMailMock.mock.calls[0][0];
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expect(mailArgs.from).toBe('billing@dashcaddy.test');
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expect(mailArgs.to).toBe('alice@example.com');
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// Subject contains duration and "invoice".
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expect(mailArgs.subject).toContain('DashCaddy Pro');
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expect(mailArgs.subject).toContain('invoice');
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// HTML + text both present (multipart/alternative).
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expect(mailArgs.text).toBeDefined();
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expect(mailArgs.html).toBeDefined();
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expect(mailArgs.html).toContain('Hi Alice'); // first name from customer_details.name
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expect(mailArgs.html).toContain('INV-'); // invoice number
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expect(mailArgs.html).toContain('$50.00'); // 90d tier price
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// PDF attachment present.
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expect(Array.isArray(mailArgs.attachments)).toBe(true);
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expect(mailArgs.attachments).toHaveLength(1);
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expect(mailArgs.attachments[0].filename).toMatch(/^DashCaddy-Pro-Invoice-INV-.+\.pdf$/);
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expect(mailArgs.attachments[0].contentType).toBe('application/pdf');
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expect(mailArgs.attachments[0].encoding).toBe('base64');
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expect(mailArgs.attachments[0].content.length).toBeGreaterThan(1000); // real PDF
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// PDF magic bytes.
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expect(mailArgs.attachments[0].content.slice(0, 4).toString('ascii')).toBe('%PDF');
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});
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test('falls back to catalog amount when line_items are missing', async () => {
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const sendMailMock = jest.fn().mockResolvedValue({ messageId: 'test' });
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injectSmtp(sendMailMock);
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process.env.SMTP_HOST = 'smtp.test';
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process.env.SMTP_FROM = 'billing@dashcaddy.test';
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const event = buildSessionEvent({ productId: 'pro-365d' });
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// Strip line_items entirely (simulates a webhook without expansion).
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delete event.data.object.line_items;
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delete event.data.object.amount_total;
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// Strip customer_details.name to verify "Hi there," fallback.
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delete event.data.object.customer_details.name;
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const { rawBody, signatureHeader } = buildSignedPayload(event);
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const result = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(result.status).toBe(200);
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const mailArgs = sendMailMock.mock.calls[0][0];
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// Falls back to catalog: pro-365d is $99.00.
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expect(mailArgs.html).toContain('$99.00');
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expect(mailArgs.html).toContain('Hi there,');
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});
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test('dev-console fallback logs invoice number + PDF size', async () => {
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const event = buildSessionEvent({ productId: 'pro-30d' });
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event.data.object.customer_details.name = 'Bob';
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const { rawBody, signatureHeader } = buildSignedPayload(event);
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const result = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(result.status).toBe(200);
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expect(result.body.deliveredVia).toBe('dev-console');
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// We can't easily assert on log output from here, but the status proves
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// the dev-console path was taken. The log line includes pdfBytes —
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// covered indirectly by invoice.test.js verifying the PDF size.
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});
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test('uses claim createdAt as issuedAt (not now) for stable retry semantics', async () => {
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const sendMailMock = jest.fn().mockResolvedValue({ messageId: 'test' });
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injectSmtp(sendMailMock);
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process.env.SMTP_HOST = 'smtp.test';
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process.env.SMTP_FROM = 'billing@dashcaddy.test';
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const event = buildSessionEvent({ productId: 'pro-30d' });
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const { rawBody, signatureHeader } = buildSignedPayload(event);
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const result = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(result.status).toBe(200);
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const mailArgs = sendMailMock.mock.calls[0][0];
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// The "Issued" line must reflect the claim's createdAt (which is when
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// the customer paid), not the moment we sent the email.
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expect(mailArgs.html).toMatch(/Issued[\s\S]*?\d{4}-\d{2}-\d{2} \d{2}:\d{2} UTC/);
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});
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test('gracefully degrades to text-only email when PDF render fails', async () => {
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const sendMailMock = jest.fn().mockResolvedValue({ messageId: 'test' });
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injectSmtp(sendMailMock);
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process.env.SMTP_HOST = 'smtp.test';
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process.env.SMTP_FROM = 'billing@dashcaddy.test';
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// Force PDF render to throw by passing an invalid issuedAt — this
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// exercises the try/catch around renderInvoicePdf and verifies the
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// bridge still sends a text+HTML email without the attachment.
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// (PDFKit auto-escapes most non-ASCII; lone surrogates no longer
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// throw on this PDFKit version. Bad dates remain a real crash path.)
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const event = buildSessionEvent({ productId: 'pro-30d' });
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// Override issuedAt to an invalid date via the bridge's deliverCode arg.
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// The bridge forwards this from the invoice module, which we can stub
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// at module level for this test.
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const invoiceMod = require('../../src/billing/invoice');
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const originalRender = invoiceMod.renderInvoicePdf;
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invoiceMod.renderInvoicePdf = jest.fn().mockRejectedValue(new Error('simulated PDF render failure'));
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try {
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const { rawBody, signatureHeader } = buildSignedPayload(event);
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const result = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(result.status).toBe(200);
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expect(result.body.delivered).toBe(true);
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expect(sendMailMock).toHaveBeenCalledTimes(1);
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const mailArgs = sendMailMock.mock.calls[0][0];
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// No PDF attachment when render failed.
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expect(mailArgs.attachments).toBeUndefined();
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// Text + HTML still sent (keygen mock uses DC-TEST-... in this suite).
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expect(mailArgs.text).toMatch(/DC-(PRO|TEST)-/);
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expect(mailArgs.html).toContain('DashCaddy');
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} finally {
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invoiceMod.renderInvoicePdf = originalRender;
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}
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});
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test('replay (layer-1 event-id idempotency) does NOT re-render the invoice', async () => {
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const sendMailMock = jest.fn().mockResolvedValue({ messageId: 'test' });
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injectSmtp(sendMailMock);
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process.env.SMTP_HOST = 'smtp.test';
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process.env.SMTP_FROM = 'billing@dashcaddy.test';
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const event = buildSessionEvent({ productId: 'pro-30d' });
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const { rawBody, signatureHeader } = buildSignedPayload(event);
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const sessionId = event.data.object.id;
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// First delivery — generates a new license + invoice.
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const first = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(first.body.delivered).toBe(true);
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expect(first.body.codeId).toBeDefined();
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const firstCodeId = first.body.codeId;
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expect(sendMailMock).toHaveBeenCalledTimes(1);
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// Second delivery of the SAME event — should be deduplicated by event id
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// at the layer-1 check (bridge.checkEventIdempotency). SMTP must NOT be
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// called again because Stripe retrying the same event ID should never
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// re-send the invoice.
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const second = await bridge.handleWebhook({ rawBody, signatureHeader });
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expect(second.body.delivered).toBe(true);
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expect(second.body.deduplicated).toBe(true);
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expect(sendMailMock).toHaveBeenCalledTimes(1);
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});
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test('layer-2 (different event, same session) does NOT re-send the invoice', async () => {
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// Stripe can send BOTH `checkout.session.completed` AND
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// `checkout.session.async_payment_succeeded` for the same Checkout Session
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// (delayed-payment methods). Layer-1 dedup doesn't catch this because
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// the event IDs differ — only the session ID is the same. The bridge
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// MUST recognize that delivery already happened via the OTHER event and
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// ack 200 without re-sending.
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const sendMailMock = jest.fn().mockResolvedValue({ messageId: 'test' });
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injectSmtp(sendMailMock);
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process.env.SMTP_HOST = 'smtp.test';
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process.env.SMTP_FROM = 'billing@dashcaddy.test';
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const sessionId = `cs_test_layer2_${crypto.randomBytes(4).toString('hex')}`;
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const eventA = buildSessionEvent({
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productId: 'pro-30d',
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sessionId,
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eventId: `evt_A_${crypto.randomBytes(4).toString('hex')}`,
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});
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eventA.type = 'checkout.session.completed';
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const eventB = buildSessionEvent({
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productId: 'pro-30d',
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sessionId,
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eventId: `evt_B_${crypto.randomBytes(4).toString('hex')}`,
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});
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eventB.type = 'checkout.session.async_payment_succeeded';
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// First event: completes the payment, sends the invoice.
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const sigA = buildSignedPayload(eventA);
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const resultA = await bridge.handleWebhook({ rawBody: sigA.rawBody, signatureHeader: sigA.signatureHeader });
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expect(resultA.status).toBe(200);
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expect(resultA.body.delivered).toBe(true);
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expect(resultA.body.deduplicated).toBeUndefined();
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expect(sendMailMock).toHaveBeenCalledTimes(1);
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const firstInvoice = sendMailMock.mock.calls[0][0].attachments[0].filename;
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// Second event for the SAME session: must NOT re-send (different event
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// id, so layer-1 dedup doesn't catch it; layer-2 must).
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const sigB = buildSignedPayload(eventB);
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const resultB = await bridge.handleWebhook({ rawBody: sigB.rawBody, signatureHeader: sigB.signatureHeader });
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expect(resultB.status).toBe(200);
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expect(resultB.body.delivered).toBe(true);
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expect(resultB.body.deduplicated).toBe(true);
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// CRITICAL: only ONE SMTP call. Two invoice emails with different invoice
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// numbers for one charge is a financial-document bug.
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expect(sendMailMock).toHaveBeenCalledTimes(1);
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const secondInvoice = sendMailMock.mock.calls[0][0].attachments[0].filename;
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expect(secondInvoice).toBe(firstInvoice); // same invoice number
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});
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});
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