feat: add function to compute safe tx hash

Author: keiff3r

package.json

@@ -63,10 +63,12 @@
   "dependencies": {
     "@ledgerhq/hw-transport": "6.31.3",
     "@ledgerhq/logs": "6.12.0",
+    "@safe-global/protocol-kit": "^5.0.4",
     "bip32-path": "^0.4.2",
     "bitcoinjs-lib": "^5.2.0",
     "bs58": "^4.0.1",
     "bs58check": "^2.1.2",
+    "ethers": "^6.13.4",
     "invariant": "^2.2.4",
     "ripemd160": "2",
     "semver": "^7.3.5",

tsconfig.json

@@ -20,7 +20,7 @@
     "module": "commonjs",
     "lib": ["DOM", "ES2017"],
     "isolatedModules": false,
-    "target": "ES6"
+    "target": "ES2020"
   },
   "include": ["src/**/*"]
 }

utils/compute_hash_safe_tx.ts

@@ -0,0 +1,65 @@
+#!/usr/bin/env bun
+
+const { calculateSafeTransactionHash } = require("@safe-global/protocol-kit/dist/src/utils")
+const { ethers } = require("ethers")
+
+const network: "mainnet" | "testnet" = "mainnet"
+
+function decodeTxData(data: string) {
+  const [bitcoinRedeemer, amount, extrData] = new ethers.Interface([
+    "function approveAndCall(address spender, uint256 value, bytes extraData) returns (bool)",
+  ]).decodeFunctionData("approveAndCall", data)
+
+  const [
+    verifyingContract, // Safe Address
+    walletPublicKeyHash,
+    mainUtxoTransactionHash,
+    mainUtxoOutputIndex,
+    mainUtxoValue,
+    redeemerOutputScript,
+  ] = ethers.AbiCoder.defaultAbiCoder().decode(
+    ["address", "bytes20", "bytes32", "uint32", "uint64", "bytes"],
+    extrData,
+  )
+
+  return {
+    bitcoinRedeemer,
+    amount,
+    extrData: {
+      verifyingContract,
+      walletPublicKeyHash,
+      mainUtxoTransactionHash,
+      mainUtxoOutputIndex,
+      mainUtxoValue,
+      redeemerOutputScript,
+    },
+  }
+}
+
+// TRANSACTION DATA
+const safeTx = {
+  to: "0xdf217efd8f3ecb5e837aedf203c28c1f06854017",
+  value: "0x0",
+  data: "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",
+  operation: "0",
+  safeTxGas: "0x0",
+  baseGas: "0x0",
+  gasPrice: "0x0",
+  gasToken: "0x0000000000000000000000000000000000000000",
+  refundReceiver: "0x0000000000000000000000000000000000000000",
+  nonce: "0",
+}
+
+const decodedTxData = decodeTxData(safeTx.data)
+console.log("Decoded Tx Data:", decodedTxData)
+
+console.log("Network", network)
+
+const safeTxHash = calculateSafeTransactionHash(
+  decodedTxData.extrData.verifyingContract,
+  safeTx,
+  "1.4.1",
+  network === "mainnet" ? 1n : 1115511n,
+)
+
+console.log("Safe Tx Hash:", safeTxHash)