From 4b0d5c40b68b86fac88bb437fa70eb3a5c28eff1 Mon Sep 17 00:00:00 2001
From: getlarge <ed@getlarge.eu>
Date: Thu, 10 Dec 2020 12:54:00 +0100
Subject: [PATCH] test delegated signature

Signed-off-by: getlarge <ed@getlarge.eu>
---
 test/constants.js                         | 17 +++++++
 test/integration/test_integration.js      | 55 ++++++++++++++++++++++-
 test/transaction/test_cryptoconditions.js | 19 ++++++++
 3 files changed, 90 insertions(+), 1 deletion(-)

diff --git a/test/constants.js b/test/constants.js
index 6062fec..1888ce9 100644
--- a/test/constants.js
+++ b/test/constants.js
@@ -3,6 +3,8 @@
 // Code is Apache-2.0 and docs are CC-BY-4.0
 
 import test from 'ava'
+import base58 from 'bs58'
+import { Ed25519Sha256 } from 'crypto-conditions'
 import { Transaction, Ed25519Keypair } from '../src'
 // TODO: Find out if ava has something like conftest, if so put this there.
 
@@ -31,6 +33,21 @@ export const bob = new Ed25519Keypair()
 export const bobCondition = Transaction.makeEd25519Condition(bob.publicKey)
 export const bobOutput = Transaction.makeOutput(bobCondition)
 
+export function delegatedSignTransaction(...keyPairs) {
+    return function sign(transaction, input, transactionHash) {
+        const filteredKeyPairs = keyPairs.filter(({ publicKey }) =>
+            input.owners_before.includes(publicKey))
+        const ed25519Fulfillment = new Ed25519Sha256()
+        filteredKeyPairs.forEach(keyPair => {
+            const privateKey = Buffer.from(base58.decode(keyPair.privateKey))
+            ed25519Fulfillment.sign(
+                Buffer.from(transactionHash, 'hex'),
+                privateKey
+            )
+        })
+        return ed25519Fulfillment.serializeUri()
+    }
+}
 
 // TODO: https://github.com/avajs/ava/issues/1190
 test('', () => 'dirty hack. TODO: Exclude this file from being run by ava')
diff --git a/test/integration/test_integration.js b/test/integration/test_integration.js
index b19c4a9..d132586 100644
--- a/test/integration/test_integration.js
+++ b/test/integration/test_integration.js
@@ -13,7 +13,8 @@ import {
     bob,
     bobOutput,
     asset,
-    metaData
+    metaData,
+    delegatedSignTransaction
 } from '../constants'
 
 
@@ -202,6 +203,58 @@ test('Valid TRANSFER transaction with multiple Ed25519 inputs from different tra
         })
 })
 
+test('Valid CREATE transaction using delegateSign with default node', t => {
+    const conn = new Connection()
+
+    const tx = Transaction.makeCreateTransaction(
+        asset(),
+        metaData,
+        [aliceOutput],
+        alice.publicKey
+    )
+
+    const txSigned = Transaction.delegateSignTransaction(
+        tx,
+        delegatedSignTransaction(alice)
+    )
+
+    return conn.postTransaction(txSigned)
+        .then(resTx => {
+            t.truthy(resTx)
+        })
+})
+
+test('Valid TRANSFER transaction with multiple Ed25519 inputs using delegateSign', t => {
+    const conn = new Connection(API_PATH)
+    const createTx = Transaction.makeCreateTransaction(
+        asset(),
+        metaData,
+        [aliceOutput, bobOutput],
+        alice.publicKey
+    )
+    const createTxSigned = Transaction.signTransaction(
+        createTx,
+        alice.privateKey
+    )
+
+    return conn.postTransactionCommit(createTxSigned)
+        .then(() => {
+            const transferTx = Transaction.makeTransferTransaction(
+                [{ tx: createTxSigned, output_index: 0 }, { tx: createTxSigned, output_index: 1 }],
+                [Transaction.makeOutput(aliceCondition, '2')],
+                metaData
+            )
+
+            const transferTxSigned = Transaction.delegateSignTransaction(
+                transferTx,
+                delegatedSignTransaction(alice, bob)
+            )
+
+            return conn.postTransactionCommit(transferTxSigned)
+                .then(resTx => t.truthy(resTx))
+        })
+})
+
 test('Search for spent and unspent outputs of a given public key', t => {
     const conn = new Connection(API_PATH)
     const carol = new Ed25519Keypair()
diff --git a/test/transaction/test_cryptoconditions.js b/test/transaction/test_cryptoconditions.js
index 80609b2..b6fe2bb 100644
--- a/test/transaction/test_cryptoconditions.js
+++ b/test/transaction/test_cryptoconditions.js
@@ -5,6 +5,7 @@
 import test from 'ava'
 import cc from 'crypto-conditions'
 import { Ed25519Keypair, Transaction, ccJsonLoad } from '../../src'
+import { delegatedSignTransaction } from '../constants'
 import sha256Hash from '../../src/sha256Hash'
 
 test('Ed25519 condition encoding', t => {
@@ -96,6 +97,24 @@ test('Fulfillment correctly formed', t => {
     ))
 })
 
+test('Delegated signature is correct', t => {
+    const alice = new Ed25519Keypair()
+
+    const txCreate = Transaction.makeCreateTransaction(
+        {},
+        {},
+        [Transaction.makeOutput(Transaction.makeEd25519Condition(alice.publicKey))],
+        alice.publicKey
+    )
+
+    const signCreateTransaction = Transaction.signTransaction(txCreate, alice.privateKey)
+    const delegatedSignCreateTransaction = Transaction.delegateSignTransaction(
+        txCreate,
+        delegatedSignTransaction(alice)
+    )
+    t.deepEqual(signCreateTransaction, delegatedSignCreateTransaction)
+})
+
 
 test('CryptoConditions JSON load', t => {
     const cond = ccJsonLoad({