fix: wip

packages/lib/server-only/signature-level/assert-compatible-recipient-grouping.test.ts

@@ -0,0 +1,80 @@
+import { RecipientRole } from '@prisma/client';
+import { describe, expect, it } from 'vitest';
+
+import { SignatureLevel } from '../../types/signature-level';
+import { assertCompatibleRecipientGrouping } from './assert-compatible-recipient-grouping';
+
+const signer = (signingOrder: number | null) => ({ role: RecipientRole.SIGNER, signingOrder });
+const cc = (signingOrder: number | null) => ({ role: RecipientRole.CC, signingOrder });
+
+const expectRejected = (
+  signatureLevel: string,
+  recipients: Array<{ role: RecipientRole; signingOrder: number | null }>,
+) => {
+  expect(() => assertCompatibleRecipientGrouping({ signatureLevel, recipients })).toThrow(
+    /signing group|same signing step/i,
+  );
+};
+
+const expectAccepted = (
+  signatureLevel: string,
+  recipients: Array<{ role: RecipientRole; signingOrder: number | null }>,
+) => {
+  expect(() => assertCompatibleRecipientGrouping({ signatureLevel, recipients })).not.toThrow();
+};
+
+describe('assertCompatibleRecipientGrouping', () => {
+  describe('AES/QES envelopes', () => {
+    for (const signatureLevel of [SignatureLevel.AES, SignatureLevel.QES]) {
+      it(`rejects two signers sharing a signing order (${signatureLevel})`, () => {
+        expectRejected(signatureLevel, [signer(1), signer(2), signer(2)]);
+      });
+
+      it(`accepts distinct signing orders (${signatureLevel})`, () => {
+        expectAccepted(signatureLevel, [signer(1), signer(2), signer(3)]);
+      });
+    }
+
+    // Every null order collapses into the same tail step, so two of them sign
+    // in parallel exactly as a duplicate order would.
+    it('rejects two signers without a signing order', () => {
+      expectRejected(SignatureLevel.AES, [signer(null), signer(null)]);
+    });
+
+    it('rejects a signer without an order alongside an ordered signer', () => {
+      // The unordered recipient shares the tail step with the other null.
+      expectRejected(SignatureLevel.AES, [signer(1), signer(null), signer(null)]);
+    });
+
+    it('accepts a single signer without a signing order', () => {
+      expectAccepted(SignatureLevel.AES, [signer(null)]);
+    });
+
+    it('accepts one ordered signer and one unordered signer', () => {
+      expectAccepted(SignatureLevel.AES, [signer(1), signer(null)]);
+    });
+
+    // CC recipients never sign, so their order carries no meaning.
+    it('ignores CC recipients sharing an order with a signer', () => {
+      expectAccepted(SignatureLevel.AES, [signer(1), cc(1)]);
+    });
+
+    it('ignores several CC recipients sharing an order with each other', () => {
+      expectAccepted(SignatureLevel.AES, [signer(1), cc(2), cc(2), cc(null), cc(null)]);
+    });
+
+    it('accepts an empty recipient list', () => {
+      expectAccepted(SignatureLevel.AES, []);
+    });
+  });
+
+  describe('SES envelopes', () => {
+    it('permits signing groups', () => {
+      expectAccepted(SignatureLevel.SES, [signer(1), signer(2), signer(2)]);
+    });
+
+    it('permits multiple unordered signers', () => {
+      expectAccepted(SignatureLevel.SES, [signer(null), signer(null)]);
+    });
+  });
+});