🔨 contracts: add safe propose script

contracts/script/SafePropose.s.sol

@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: AGPL-3.0
+pragma solidity ^0.8.0;
+
+import { LibString } from "solady/utils/LibString.sol";
+import { Surl } from "surl/Surl.sol";
+
+import { BaseScript, stdJson } from "./Base.s.sol";
+
+contract SafePropose is BaseScript {
+  using LibString for address;
+  using LibString for bytes;
+  using LibString for uint256;
+  using stdJson for string;
+  using Surl for string;
+
+  IMultiSendCallOnly internal constant MULTI_SEND = IMultiSendCallOnly(0x9641d764fc13c8B624c04430C7356C1C7C8102e2); // github.com/safe-global/safe-deployments v1.4.1
+
+  function run(string calldata path) external {
+    string memory json = vm.readFile(path); // forge-lint: disable-line(unsafe-cheatcode)
+    uint256 length;
+    while (vm.keyExistsJson(json, string.concat(".transactions[", length.toString(), "]"))) ++length;
+    if (length == 0) revert EmptyBroadcast();
+    Call[] memory calls = new Call[](length);
+    address safe;
+    for (uint256 i = 0; i < length; ++i) {
+      string memory prefix = string.concat(".transactions[", i.toString(), "]");
+      if (keccak256(bytes(json.readString(string.concat(prefix, ".transactionType")))) != keccak256("CALL")) {
+        revert NotACall();
+      }
+      prefix = string.concat(prefix, ".transaction");
+      address from = json.readAddress(string.concat(prefix, ".from"));
+      if (i == 0) safe = from;
+      else if (from != safe) revert SenderMismatch();
+      calls[i] = Call({
+        to: json.readAddress(string.concat(prefix, ".to")),
+        value: json.readUint(string.concat(prefix, ".value")),
+        data: json.readBytes(string.concat(prefix, ".input"))
+      });
+    }
+    if (length == 1) propose(ISafe(safe), calls[0].to, calls[0].value, calls[0].data, 0);
+    else proposeBatch(ISafe(safe), calls);
+  }
+
+  function proposeBatch(ISafe safe, Call[] memory calls) internal {
+    bytes memory packed;
+    for (uint256 i = 0; i < calls.length; ++i) {
+      packed = abi.encodePacked(packed, uint8(0), calls[i].to, calls[i].value, calls[i].data.length, calls[i].data);
+    }
+    propose(safe, address(MULTI_SEND), 0, abi.encodeCall(MULTI_SEND.multiSend, (packed)), 1);
+  }
+
+  function propose(ISafe safe, address to, uint256 value, bytes memory data, uint8 operation) internal virtual {
+    string memory hexSafe = address(safe).toHexStringChecksummed();
+    string memory url = string.concat(
+      "https://api.safe.global/tx-service/", _chainPrefix(), "/api/v2/safes/", hexSafe, "/multisig-transactions/"
+    );
+    uint256 nonce = safe.nonce();
+    bytes32 safeTxHash =
+      safe.getTransactionHash(to, value, data, operation, 0, 0, 0, address(0), payable(address(0)), nonce);
+    address sender;
+    bytes memory signature;
+    {
+      (uint8 v, bytes32 r, bytes32 s) = vm.sign(safeTxHash);
+      sender = ecrecover(safeTxHash, v, r, s);
+      signature = abi.encodePacked(r, s, v);
+    }
+    string[] memory headers = new string[](1);
+    headers[0] = "Content-Type: application/json";
+    (uint256 status, bytes memory response) =
+      url.post(headers, _body(to, value, data, operation, nonce, safeTxHash, sender, signature));
+    if (status != 201) revert ProposalFailed(status, string(response));
+  }
+
+  // solhint-disable quotes
+  function _body(
+    address to,
+    uint256 value,
+    bytes memory data,
+    uint8 operation,
+    uint256 nonce,
+    bytes32 safeTxHash,
+    address sender,
+    bytes memory signature
+  ) internal pure returns (string memory) {
+    return string.concat(
+      string.concat(
+        '{"to":"',
+        to.toHexStringChecksummed(),
+        '","value":"',
+        value.toString(),
+        '","data":"',
+        data.length == 0 ? "0x" : data.toHexString(),
+        '","operation":',
+        uint256(operation).toString(),
+        ',"safeTxGas":"0","baseGas":"0","gasPrice":"0","gasToken":"',
+        address(0).toHexStringChecksummed(),
+        '","refundReceiver":"',
+        address(0).toHexStringChecksummed()
+      ),
+      '","nonce":',
+      nonce.toString(),
+      ',"contractTransactionHash":"',
+      bytes.concat(safeTxHash).toHexString(),
+      '","sender":"',
+      sender.toHexStringChecksummed(),
+      '","signature":"',
+      signature.toHexString(),
+      '"}'
+    );
+  }
+  // solhint-enable quotes
+
+  function _chainPrefix() internal view returns (string memory) {
+    if (block.chainid == 1) return "eth";
+    if (block.chainid == 10) return "oeth"; // cspell:ignore oeth
+    if (block.chainid == 137) return "pol";
+    if (block.chainid == 8453) return "base";
+    if (block.chainid == 42_161) return "arb1";
+    if (block.chainid == 204) return "opbnb"; // cspell:ignore opbnb
+    revert UnsupportedChain();
+  }
+}
+
+error EmptyBroadcast();
+error NotACall();
+error ProposalFailed(uint256 status, string response);
+error SenderMismatch();
+error UnsupportedChain();
+
+struct Call {
+  address to;
+  uint256 value;
+  bytes data;
+}
+
+interface IMultiSendCallOnly {
+  function multiSend(bytes memory transactions) external;
+}
+
+interface ISafe {
+  function nonce() external view returns (uint256);
+  function getTransactionHash(
+    address to,
+    uint256 value,
+    bytes calldata data,
+    uint8 operation,
+    uint256 safeTxGas,
+    uint256 baseGas,
+    uint256 gasPrice,
+    address gasToken,
+    address payable refundReceiver,
+    uint256 _nonce
+  ) external view returns (bytes32);
+}