fix: Increase maximum code body length for contract deploys

packages/transactions/src/constants.ts

@@ -11,6 +11,18 @@ export const COMPRESSED_PUBKEY_LENGTH_BYTES = 32;
 export const UNCOMPRESSED_PUBKEY_LENGTH_BYTES = 64;
 export const MEMO_MAX_LENGTH_BYTES = 34;
 
+// https://github.com/stacks-network/stacks-core/blob/31d048c6c345c8cb7be38283385e54870b1c3c83/stacks-common/src/codec/mod.rs#L206
+// messages can't be bigger than 16MB plus the preamble and relayers
+const MAX_PAYLOAD_LEN = 1 + 16 * 1024 * 1024;
+const PREAMBLE_ENCODED_SIZE = 165;
+const MAX_RELAYERS_LEN = 16;
+const PEER_ADDRESS_ENCODED_SIZE = 16;
+const HASH160_ENCODED_SIZE = 20;
+const NEIGHBOR_ADDRESS_ENCODED_SIZE = PEER_ADDRESS_ENCODED_SIZE + 2 + HASH160_ENCODED_SIZE;
+const RELAY_DATA_ENCODED_SIZE = NEIGHBOR_ADDRESS_ENCODED_SIZE + 4;
+export const STRING_MAX_LENGTH =
+  MAX_PAYLOAD_LEN + (PREAMBLE_ENCODED_SIZE + MAX_RELAYERS_LEN * RELAY_DATA_ENCODED_SIZE);
+
 /**
  * The type of transaction (payload) that is being serialized.
  * Used internally for serializing and deserializing transactions.

packages/transactions/src/wire/serialization.ts

@@ -28,6 +28,7 @@ import {
   COMPRESSED_PUBKEY_LENGTH_BYTES,
   ClarityVersion,
   FungibleConditionCode,
+  STRING_MAX_LENGTH,
   MEMO_MAX_LENGTH_BYTES,
   NonFungibleConditionCode,
   PayloadType,
@@ -541,7 +542,7 @@ export function deserializePayload(serialized: string | Uint8Array | BytesReader
         throw new Error(`Cannot recognize ClarityVersion: ${n}`);
       });
       const smartContractName = deserializeLPString(bytesReader);
-      const codeBody = deserializeLPString(bytesReader, 4, 100_000);
+      const codeBody = deserializeLPString(bytesReader, 4, STRING_MAX_LENGTH);
       return createSmartContractPayload(smartContractName, codeBody, clarityVersion);
     }
     case PayloadType.PoisonMicroblock:

packages/transactions/tests/transaction.test.ts

@@ -22,6 +22,7 @@ import {
   AddressHashMode,
   AuthType,
   FungibleConditionCode,
+  PayloadType,
   PostConditionMode,
 } from '../src/constants';
 import { createStacksPublicKey, privateKeyToPublic, publicKeyToHex } from '../src/keys';
@@ -46,6 +47,8 @@ import {
   serializeTransaction,
   transactionToHex,
 } from '../src/transaction';
+import fs from 'node:fs';
+import assert from 'node:assert';
 
 beforeEach(() => {
   fetchMock.resetMocks();
@@ -450,6 +453,25 @@ test('Coinbase pay to alt contract principal recipient deserialization', () => {
   expect(deserializedTx.transactionVersion).toBe(TransactionVersion.Testnet);
 });
 
+test('deserialize wtf tx', () => {
+  const largeTxDeployBody = fs.readFileSync('./tests/tx-contract-deploy-large-hex.txt', 'utf8');
+  const reader = new BytesReader(largeTxDeployBody);
+  const deserialized = deserializeTransaction(reader);
+  expect(deserialized.payload).toBeTruthy();
+  assert(deserialized.payload.payloadType === PayloadType.VersionedSmartContract);
+  expect(deserialized.payload.contractName.content).toBe('tcat-01');
+  expect(
+    deserialized.payload.codeBody.content.startsWith(
+      `(use-trait nma 'SP102V8P0F7JX67ARQ77WEA3D3CFB5XW39REDT0AM.trait-sip-010.sip-010-trait) (use-trait nmb 'SP2AKWJYC7BNY18W1XXKPGP0YVEK63QJG4793Z2D4.sip-010-trait-ft-standard.sip-010-trait) (use-trait nmc 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.dao-traits-v4.sip010-ft-trait`
+    )
+  );
+  expect(
+    deserialized.payload.codeBody.content.endsWith(
+      `(use-trait nma 'SP102V8P0F7JX67ARQ77WEA3D3CFB5XW39REDT0AM.trait-sip-010.sip-010-trait) (use-trait nmb 'SP2AKWJYC7BNY18W1XXKPGP0YVEK63QJG4793Z2D4.sip-010-trait-ft-standard.sip-010-trait) (use-trait nmc 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.dao-traits-v4.sip010-ft-trait`
+    )
+  );
+});
+
 describe(serializeTransaction.name, () => {
   const serializedTx =
     '0x8080000000040055a0a92720d20398211cd4c7663d65d018efcc1f00000000000000030000000000000000010118da31f542913e8c56961b87ee4794924e655a28a2034e37ef4823eeddf074747285bd6efdfbd84eecdf62cffa7c1864e683c688f4c105f4db7429066735b4e2010200000000050000000000000000000000000000000000000000000000000000000000000000061aba27f99e007c7f605a8305e318c1abde3cd220ac0b68656c6c6f5f776f726c64';