1 files changed, 127 insertions, 0 deletions
diff --git a/packages/taler-util/src/contract-terms.test.ts b/packages/taler-util/src/contract-terms.test.ts
new file mode 100644
index 000000000..fc0920501
--- /dev/null
+++ b/packages/taler-util/src/contract-terms.test.ts
@@ -0,0 +1,127 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Imports.
+ */
+import test from "ava";
+import { initNodePrng } from "./prng-node.js";
+import { ContractTermsUtil } from "./contract-terms.js";
+
+// Since we import nacl-fast directly (and not via index.node.ts), we need to
+// init the PRNG manually.
+initNodePrng();
+
+test("contract terms canon hashing", (t) => {
+  const cReq = {
+    foo: 42,
+    bar: "hello",
+    $forgettable: {
+      foo: true,
+    },
+  };
+
+  const c1 = ContractTermsUtil.saltForgettable(cReq);
+  const c2 = ContractTermsUtil.saltForgettable(cReq);
+  t.assert(typeof cReq.$forgettable.foo === "boolean");
+  t.assert(typeof c1.$forgettable.foo === "string");
+  t.assert(c1.$forgettable.foo !== c2.$forgettable.foo);
+
+  const h1 = ContractTermsUtil.hashContractTerms(c1);
+
+  const c3 = ContractTermsUtil.scrub(JSON.parse(JSON.stringify(c1)));
+
+  t.assert(c3.foo === undefined);
+  t.assert(c3.bar === cReq.bar);
+
+  const h2 = ContractTermsUtil.hashContractTerms(c3);
+
+  t.deepEqual(h1, h2);
+});
+
+test("contract terms canon hashing (nested)", (t) => {
+  const cReq = {
+    foo: 42,
+    bar: {
+      prop1: "hello, world",
+      $forgettable: {
+        prop1: true,
+      },
+    },
+    $forgettable: {
+      bar: true,
+    },
+  };
+
+  const c1 = ContractTermsUtil.saltForgettable(cReq);
+
+  t.is(typeof c1.$forgettable.bar, "string");
+  t.is(typeof c1.bar.$forgettable.prop1, "string");
+
+  const forgetPath = (x: any, s: string) =>
+    ContractTermsUtil.forgetAll(x, (p) => p.join(".") === s);
+
+  // Forget bar first
+  const c2 = forgetPath(c1, "bar");
+
+  // Forget bar.prop1 first
+  const c3 = forgetPath(forgetPath(c1, "bar.prop1"), "bar");
+
+  // Forget everything
+  const c4 = ContractTermsUtil.scrub(c1);
+
+  const h1 = ContractTermsUtil.hashContractTerms(c1);
+  const h2 = ContractTermsUtil.hashContractTerms(c2);
+  const h3 = ContractTermsUtil.hashContractTerms(c3);
+  const h4 = ContractTermsUtil.hashContractTerms(c4);
+
+  t.is(h1, h2);
+  t.is(h1, h3);
+  t.is(h1, h4);
+
+  // Doesn't contain salt
+  t.false(ContractTermsUtil.validateForgettable(cReq));
+
+  t.true(ContractTermsUtil.validateForgettable(c1));
+  t.true(ContractTermsUtil.validateForgettable(c2));
+  t.true(ContractTermsUtil.validateForgettable(c3));
+  t.true(ContractTermsUtil.validateForgettable(c4));
+});
+
+test("contract terms reference vector", (t) => {
+  const j = {
+    k1: 1,
+    $forgettable: {
+      k1: "SALT",
+    },
+    k2: {
+      n1: true,
+      $forgettable: {
+        n1: "salt",
+      },
+    },
+    k3: {
+      n1: "string",
+    },
+  };
+
+  const h = ContractTermsUtil.hashContractTerms(j);
+
+  t.deepEqual(
+    h,
+    "VDE8JPX0AEEE3EX1K8E11RYEWSZQKGGZCV6BWTE4ST1C8711P7H850Z7F2Q2HSSYETX87ERC2JNHWB7GTDWTDWMM716VKPSRBXD7SRR",
+  );
+});