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Diffstat (limited to 'contracts/multisig/contracts/src/MultiSigWallet.sol')
| -rw-r--r-- | contracts/multisig/contracts/src/MultiSigWallet.sol | 393 |
1 files changed, 393 insertions, 0 deletions
diff --git a/contracts/multisig/contracts/src/MultiSigWallet.sol b/contracts/multisig/contracts/src/MultiSigWallet.sol new file mode 100644 index 000000000..516e7391c --- /dev/null +++ b/contracts/multisig/contracts/src/MultiSigWallet.sol @@ -0,0 +1,393 @@ +// solhint-disable +pragma solidity ^0.4.15; + + +/// @title Multisignature wallet - Allows multiple parties to agree on transactions before execution. +/// @author Stefan George - <stefan.george@consensys.net> +contract MultiSigWallet { + + /* + * Events + */ + event Confirmation(address indexed sender, uint indexed transactionId); + event Revocation(address indexed sender, uint indexed transactionId); + event Submission(uint indexed transactionId); + event Execution(uint indexed transactionId); + event ExecutionFailure(uint indexed transactionId); + event Deposit(address indexed sender, uint value); + event OwnerAddition(address indexed owner); + event OwnerRemoval(address indexed owner); + event RequirementChange(uint required); + + /* + * Constants + */ + uint constant public MAX_OWNER_COUNT = 50; + + /* + * Storage + */ + mapping (uint => Transaction) public transactions; + mapping (uint => mapping (address => bool)) public confirmations; + mapping (address => bool) public isOwner; + address[] public owners; + uint public required; + uint public transactionCount; + + struct Transaction { + address destination; + uint value; + bytes data; + bool executed; + } + + /* + * Modifiers + */ + modifier onlyWallet() { + require(msg.sender == address(this)); + _; + } + + modifier ownerDoesNotExist(address owner) { + require(!isOwner[owner]); + _; + } + + modifier ownerExists(address owner) { + require(isOwner[owner]); + _; + } + + modifier transactionExists(uint transactionId) { + require(transactions[transactionId].destination != 0); + _; + } + + modifier confirmed(uint transactionId, address owner) { + require(confirmations[transactionId][owner]); + _; + } + + modifier notConfirmed(uint transactionId, address owner) { + require(!confirmations[transactionId][owner]); + _; + } + + modifier notExecuted(uint transactionId) { + require(!transactions[transactionId].executed); + _; + } + + modifier notNull(address _address) { + require(_address != 0); + _; + } + + modifier validRequirement(uint ownerCount, uint _required) { + require(ownerCount <= MAX_OWNER_COUNT + && _required <= ownerCount + && _required != 0 + && ownerCount != 0); + _; + } + + /// @dev Fallback function allows to deposit ether. + function() + payable + { + if (msg.value > 0) + Deposit(msg.sender, msg.value); + } + + /* + * Public functions + */ + /// @dev Contract constructor sets initial owners and required number of confirmations. + /// @param _owners List of initial owners. + /// @param _required Number of required confirmations. + function MultiSigWallet(address[] _owners, uint _required) + public + validRequirement(_owners.length, _required) + { + for (uint i=0; i<_owners.length; i++) { + require(!isOwner[_owners[i]] && _owners[i] != 0); + isOwner[_owners[i]] = true; + } + owners = _owners; + required = _required; + } + + /// @dev Allows to add a new owner. Transaction has to be sent by wallet. + /// @param owner Address of new owner. + function addOwner(address owner) + public + onlyWallet + ownerDoesNotExist(owner) + notNull(owner) + validRequirement(owners.length + 1, required) + { + isOwner[owner] = true; + owners.push(owner); + OwnerAddition(owner); + } + + /// @dev Allows to remove an owner. Transaction has to be sent by wallet. + /// @param owner Address of owner. + function removeOwner(address owner) + public + onlyWallet + ownerExists(owner) + { + isOwner[owner] = false; + for (uint i=0; i<owners.length - 1; i++) + if (owners[i] == owner) { + owners[i] = owners[owners.length - 1]; + break; + } + owners.length -= 1; + if (required > owners.length) + changeRequirement(owners.length); + OwnerRemoval(owner); + } + + /// @dev Allows to replace an owner with a new owner. Transaction has to be sent by wallet. + /// @param owner Address of owner to be replaced. + /// @param newOwner Address of new owner. + function replaceOwner(address owner, address newOwner) + public + onlyWallet + ownerExists(owner) + ownerDoesNotExist(newOwner) + { + for (uint i=0; i<owners.length; i++) + if (owners[i] == owner) { + owners[i] = newOwner; + break; + } + isOwner[owner] = false; + isOwner[newOwner] = true; + OwnerRemoval(owner); + OwnerAddition(newOwner); + } + + /// @dev Allows to change the number of required confirmations. Transaction has to be sent by wallet. + /// @param _required Number of required confirmations. + function changeRequirement(uint _required) + public + onlyWallet + validRequirement(owners.length, _required) + { + required = _required; + RequirementChange(_required); + } + + /// @dev Allows an owner to submit and confirm a transaction. + /// @param destination Transaction target address. + /// @param value Transaction ether value. + /// @param data Transaction data payload. + /// @return Returns transaction ID. + function submitTransaction(address destination, uint value, bytes data) + public + returns (uint transactionId) + { + transactionId = addTransaction(destination, value, data); + confirmTransaction(transactionId); + } + + /// @dev Allows an owner to confirm a transaction. + /// @param transactionId Transaction ID. + function confirmTransaction(uint transactionId) + public + ownerExists(msg.sender) + transactionExists(transactionId) + notConfirmed(transactionId, msg.sender) + { + confirmations[transactionId][msg.sender] = true; + Confirmation(msg.sender, transactionId); + executeTransaction(transactionId); + } + + /// @dev Allows an owner to revoke a confirmation for a transaction. + /// @param transactionId Transaction ID. + function revokeConfirmation(uint transactionId) + public + ownerExists(msg.sender) + confirmed(transactionId, msg.sender) + notExecuted(transactionId) + { + confirmations[transactionId][msg.sender] = false; + Revocation(msg.sender, transactionId); + } + + /// @dev Allows anyone to execute a confirmed transaction. + /// @param transactionId Transaction ID. + function executeTransaction(uint transactionId) + public + ownerExists(msg.sender) + confirmed(transactionId, msg.sender) + notExecuted(transactionId) + { + if (isConfirmed(transactionId)) { + Transaction storage txn = transactions[transactionId]; + txn.executed = true; + if (external_call(txn.destination, txn.value, txn.data.length, txn.data)) + Execution(transactionId); + else { + ExecutionFailure(transactionId); + txn.executed = false; + } + } + } + + // call has been separated into its own function in order to take advantage + // of the Solidity's code generator to produce a loop that copies tx.data into memory. + function external_call(address destination, uint value, uint dataLength, bytes data) internal returns (bool) { + bool result; + assembly { + let x := mload(0x40) // "Allocate" memory for output (0x40 is where "free memory" pointer is stored by convention) + let d := add(data, 32) // First 32 bytes are the padded length of data, so exclude that + result := call( + sub(gas, 34710), // 34710 is the value that solidity is currently emitting + // It includes callGas (700) + callVeryLow (3, to pay for SUB) + callValueTransferGas (9000) + + // callNewAccountGas (25000, in case the destination address does not exist and needs creating) + destination, + value, + d, + dataLength, // Size of the input (in bytes) - this is what fixes the padding problem + x, + 0 // Output is ignored, therefore the output size is zero + ) + } + return result; + } + + /// @dev Returns the confirmation status of a transaction. + /// @param transactionId Transaction ID. + /// @return Confirmation status. + function isConfirmed(uint transactionId) + public + constant + returns (bool) + { + uint count = 0; + for (uint i=0; i<owners.length; i++) { + if (confirmations[transactionId][owners[i]]) + count += 1; + if (count == required) + return true; + } + } + + /* + * Internal functions + */ + /// @dev Adds a new transaction to the transaction mapping, if transaction does not exist yet. + /// @param destination Transaction target address. + /// @param value Transaction ether value. + /// @param data Transaction data payload. + /// @return Returns transaction ID. + function addTransaction(address destination, uint value, bytes data) + internal + notNull(destination) + returns (uint transactionId) + { + transactionId = transactionCount; + transactions[transactionId] = Transaction({ + destination: destination, + value: value, + data: data, + executed: false + }); + transactionCount += 1; + Submission(transactionId); + } + + /* + * Web3 call functions + */ + /// @dev Returns number of confirmations of a transaction. + /// @param transactionId Transaction ID. + /// @return Number of confirmations. + function getConfirmationCount(uint transactionId) + public + constant + returns (uint count) + { + for (uint i=0; i<owners.length; i++) + if (confirmations[transactionId][owners[i]]) + count += 1; + } + + /// @dev Returns total number of transactions after filers are applied. + /// @param pending Include pending transactions. + /// @param executed Include executed transactions. + /// @return Total number of transactions after filters are applied. + function getTransactionCount(bool pending, bool executed) + public + constant + returns (uint count) + { + for (uint i=0; i<transactionCount; i++) + if ( pending && !transactions[i].executed + || executed && transactions[i].executed) + count += 1; + } + + /// @dev Returns list of owners. + /// @return List of owner addresses. + function getOwners() + public + constant + returns (address[]) + { + return owners; + } + + /// @dev Returns array with owner addresses, which confirmed transaction. + /// @param transactionId Transaction ID. + /// @return Returns array of owner addresses. + function getConfirmations(uint transactionId) + public + constant + returns (address[] _confirmations) + { + address[] memory confirmationsTemp = new address[](owners.length); + uint count = 0; + uint i; + for (i=0; i<owners.length; i++) + if (confirmations[transactionId][owners[i]]) { + confirmationsTemp[count] = owners[i]; + count += 1; + } + _confirmations = new address[](count); + for (i=0; i<count; i++) + _confirmations[i] = confirmationsTemp[i]; + } + + /// @dev Returns list of transaction IDs in defined range. + /// @param from Index start position of transaction array. + /// @param to Index end position of transaction array. + /// @param pending Include pending transactions. + /// @param executed Include executed transactions. + /// @return Returns array of transaction IDs. + function getTransactionIds(uint from, uint to, bool pending, bool executed) + public + constant + returns (uint[] _transactionIds) + { + uint[] memory transactionIdsTemp = new uint[](transactionCount); + uint count = 0; + uint i; + for (i=0; i<transactionCount; i++) + if ( pending && !transactions[i].executed + || executed && transactions[i].executed) + { + transactionIdsTemp[count] = i; + count += 1; + } + _transactionIds = new uint[](to - from); + for (i=from; i<to; i++) + _transactionIds[i - from] = transactionIdsTemp[i]; + } +}
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