feat: add transaction signature verification

web3.js/test/get-confirmed-block.test.js

@@ -0,0 +1,81 @@
+// @flow
+import {Account} from '../src/account';
+import {SystemProgram} from '../src/system-program';
+import {Transaction} from '../src/transaction';
+
+test('verify getConfirmedBlock', () => {
+  const account0 = new Account();
+  const account1 = new Account();
+  const account2 = new Account();
+  const account3 = new Account();
+  const recentBlockhash = account1.publicKey.toBase58(); // Fake recentBlockhash
+
+  // Create a couple signed transactions
+  const transfer0 = SystemProgram.transfer(
+    account0.publicKey,
+    account1.publicKey,
+    123,
+  );
+
+  const transaction0 = new Transaction({recentBlockhash}).add(transfer0);
+  transaction0.sign(account0);
+  const transfer1 = SystemProgram.transfer(
+    account2.publicKey,
+    account3.publicKey,
+    456,
+  );
+
+  let transaction1 = new Transaction({recentBlockhash}).add(transfer1);
+  transaction1.sign(account2);
+
+  // Build ConfirmedBlock, with dummy data for blockhashes, balances
+  const confirmedBlock = {
+    blockhash: recentBlockhash,
+    previousBlockhash: recentBlockhash,
+    transactions: [
+      {
+        transaction: transaction0,
+        meta: {
+          fee: 0,
+          preBalances: [100000, 100000, 1, 1, 1],
+          postBalances: [99877, 100123, 1, 1, 1],
+          status: {Ok: 'null'},
+        },
+      },
+      {
+        transaction: transaction1,
+        meta: {
+          fee: 0,
+          preBalances: [100000, 100000, 1, 1, 1],
+          postBalances: [99544, 100456, 1, 1, 1],
+          status: {Ok: 'null'},
+        },
+      },
+    ],
+    rewards: [],
+  };
+
+  // Verify signatures in ConfirmedBlock
+  for (const transactionWithMeta of confirmedBlock.transactions) {
+    expect(transactionWithMeta.transaction.verifySignatures()).toBe(true);
+  }
+
+  const bogusSignature = {
+    signature: Buffer.alloc(64, 9),
+    publicKey: account2.publicKey,
+  };
+  transaction1.signatures[0] = bogusSignature;
+
+  let badConfirmedBlock = confirmedBlock;
+  badConfirmedBlock.transactions[1].transaction = transaction1;
+
+  // Verify signatures in ConfirmedBlock
+  const verifications = badConfirmedBlock.transactions.map(
+    transactionWithMeta => transactionWithMeta.transaction.verifySignatures(),
+  );
+  expect(
+    verifications.reduce(
+      (accumulator, currentValue) => accumulator && currentValue,
+    ),
+  ).toBe(false);
+});