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feat: add complex vouchers #60

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1 change: 1 addition & 0 deletions CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
### Added

- `abi` directory to the `@cartesi/rollups` package, ideal for language bindings.
- `ComplexVouchers`: Allows DApp developers to generate more complex vouchers. See [RFP #003](https://governance.cartesi.io/t/rfp-003-beginner-solidity-complex-vouchers/90).

### Removed

Expand Down
78 changes: 78 additions & 0 deletions onchain/rollups/contracts/outputs/ComplexVouchers.sol
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@@ -0,0 +1,78 @@
// (c) Cartesi and individual authors (see AUTHORS)
// SPDX-License-Identifier: Apache-2.0 (see LICENSE)

pragma solidity ^0.8.8;

import {ICartesiDApp} from "../dapp/ICartesiDApp.sol";

/// @title Complex Vouchers
/// @notice This contract enables DApps to emit vouchers with more complex behavior.
/// @dev Any assets transferred to this contract are susceptible to being stolen.
contract ComplexVouchers {
/// @param destination The address to be called
/// @param payload The data to be forwarded to the destination
struct Voucher {
address destination;
bytes payload;
}

/// @notice Executes an atomic sequence of vouchers.
/// @param _vouchers Array of vouchers
/// @dev Reverts if any of the vouchers reverts.
function executeAtomicVoucherSequence(
Voucher[] calldata _vouchers
) external {
for (uint256 i; i < _vouchers.length; i++) {
Voucher memory voucher = _vouchers[i];
(bool success, ) = voucher.destination.call(voucher.payload);
require(success);
}
}

/// @notice Check if a voucher was executed already.
/// @param _dapp The DApp that emitted the voucher
/// @param _inputIndex The input index
/// @param _outputIndex The output index
function checkIfVoucherWasExecuted(
ICartesiDApp _dapp,
uint256 _inputIndex,
uint256 _outputIndex
) external view {
require(_dapp.wasVoucherExecuted(_inputIndex, _outputIndex));
}

/// @notice Check if `tx.origin` is in an array of addresses.
/// @param _addresses Array of addresses
function checkIfTxOriginIsInArray(
address[] calldata _addresses
) external view {
require(_find(tx.origin, _addresses));
}

/// @notice Checks if the block timestamp is greater or equal to the provided timestamp.
/// @param _ts timestamp lower bound
function checkTimestampLowerBound(uint256 _ts) external view {
require(_ts <= block.timestamp);
}

/// @notice Checks if the block timestamp is less than the provided timestamp.
/// @param _ts timestamp upper bound
function checkTimestampUpperBound(uint256 _ts) external view {
require(block.timestamp < _ts);
}

/// @notice Check if an array of addresses contain another address
/// @param haystack The list of addresses
/// @param needle The address
function _find(
address needle,
address[] calldata haystack
) internal pure returns (bool) {
for (uint256 i; i < haystack.length; i++) {
if (haystack[i] == needle) {
return true;
}
}
return false;
}
}
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