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December 21, 2017 22:59
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Created using browser-solidity: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://ethereum.github.io/browser-solidity/#version=soljson-v0.4.16+commit.d7661dd9.js&optimize=true&gist=
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pragma solidity ^0.4.16; | |
/** | |
* @title ERC20Basic | |
* @dev Simpler version of ERC20 interface | |
* @dev see https://github.com/ethereum/EIPs/issues/179 | |
*/ | |
contract ERC20Basic { | |
uint256 public totalSupply; | |
function balanceOf(address who) constant returns (uint256); | |
function transfer(address to, uint256 value) returns (bool); | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
} | |
/** | |
* @title ERC20 interface | |
* @dev see https://github.com/ethereum/EIPs/issues/20 | |
*/ | |
contract ERC20 is ERC20Basic { | |
function allowance(address owner, address spender) constant returns (uint256); | |
function transferFrom(address from, address to, uint256 value) returns (bool); | |
function approve(address spender, uint256 value) returns (bool); | |
event Approval(address indexed owner, address indexed spender, uint256 value); | |
} | |
/** | |
* @title SafeMath | |
* @dev Math operations with safety checks that throw on error | |
*/ | |
library SafeMath { | |
function mul(uint256 a, uint256 b) internal constant returns (uint256) { | |
uint256 c = a * b; | |
assert(a == 0 || c / a == b); | |
return c; | |
} | |
function div(uint256 a, uint256 b) internal constant returns (uint256) { | |
assert(b > 0); // Solidity automatically throws when dividing by 0 | |
uint256 c = a / b; | |
assert(a == b * c + a % b); // There is no case in which this doesn't hold | |
return c; | |
} | |
function sub(uint256 a, uint256 b) internal constant returns (uint256) { | |
assert(b <= a); | |
return a - b; | |
} | |
function add(uint256 a, uint256 b) internal constant returns (uint256) { | |
uint256 c = a + b; | |
assert(c >= a); | |
return c; | |
} | |
} | |
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData); } | |
contract MyToken { | |
// Public variables of the token | |
string public name; | |
string public symbol; | |
uint8 public decimals; | |
uint256 public totalSupply; | |
// This creates an array with all balances | |
mapping (address => uint256) public balanceOf; | |
mapping (address => mapping (address => uint256)) public allowance; | |
// This generates a public event on the blockchain that will notify clients | |
event Transfer(address indexed from, address indexed to, uint256 value); | |
// This notifies clients about the amount burnt | |
event Burn(address indexed from, uint256 value); | |
/** | |
* Constrctor function | |
* | |
* Initializes contract with initial supply tokens to the creator of the contract | |
*/ | |
function MyToken( | |
uint256 initialSupply, | |
string tokenName, | |
uint8 decimalUnits, | |
string tokenSymbol | |
) { | |
balanceOf[msg.sender] = initialSupply; // Give the creator all initial tokens | |
totalSupply = initialSupply; // Update total supply | |
name = tokenName; // Set the name for display purposes | |
symbol = tokenSymbol; // Set the symbol for display purposes | |
decimals = decimalUnits; // Amount of decimals for display purposes | |
} | |
/** | |
* Internal transfer, only can be called by this contract | |
*/ | |
function _transfer(address _from, address _to, uint _value) internal { | |
require(_to != 0x0); // Prevent transfer to 0x0 address. Use burn() instead | |
require(balanceOf[_from] >= _value); // Check if the sender has enough | |
require(balanceOf[_to] + _value > balanceOf[_to]); // Check for overflows | |
balanceOf[_from] -= _value; // Subtract from the sender | |
balanceOf[_to] += _value; // Add the same to the recipient | |
Transfer(_from, _to, _value); | |
} | |
/** | |
* Transfer tokens | |
* | |
* Send `_value` tokens to `_to` from your account | |
* | |
* @param _to The address of the recipient | |
* @param _value the amount to send | |
*/ | |
function transfer(address _to, uint256 _value) { | |
_transfer(msg.sender, _to, _value); | |
} | |
/** | |
* Transfer tokens from other address | |
* | |
* Send `_value` tokens to `_to` in behalf of `_from` | |
* | |
* @param _from The address of the sender | |
* @param _to The address of the recipient | |
* @param _value the amount to send | |
*/ | |
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) { | |
require(_value <= allowance[_from][msg.sender]); // Check allowance | |
allowance[_from][msg.sender] -= _value; | |
_transfer(_from, _to, _value); | |
return true; | |
} | |
/** | |
* Set allowance for other address | |
* | |
* Allows `_spender` to spend no more than `_value` tokens in your behalf | |
* | |
* @param _spender The address authorized to spend | |
* @param _value the max amount they can spend | |
*/ | |
function approve(address _spender, uint256 _value) | |
returns (bool success) { | |
allowance[msg.sender][_spender] = _value; | |
return true; | |
} | |
/** | |
* Set allowance for other address and notify | |
* | |
* Allows `_spender` to spend no more than `_value` tokens in your behalf, and then ping the contract about it | |
* | |
* @param _spender The address authorized to spend | |
* @param _value the max amount they can spend | |
* @param _extraData some extra information to send to the approved contract | |
*/ | |
function approveAndCall(address _spender, uint256 _value, bytes _extraData) | |
returns (bool success) { | |
tokenRecipient spender = tokenRecipient(_spender); | |
if (approve(_spender, _value)) { | |
spender.receiveApproval(msg.sender, _value, this, _extraData); | |
return true; | |
} | |
} | |
/** | |
* Destroy tokens | |
* | |
* Remove `_value` tokens from the system irreversibly | |
* | |
* @param _value the amount of money to burn | |
*/ | |
function burn(uint256 _value) returns (bool success) { | |
require(balanceOf[msg.sender] >= _value); // Check if the sender has enough | |
balanceOf[msg.sender] -= _value; // Subtract from the sender | |
totalSupply -= _value; // Updates totalSupply | |
Burn(msg.sender, _value); | |
return true; | |
} | |
/** | |
* Destroy tokens from other ccount | |
* | |
* Remove `_value` tokens from the system irreversibly on behalf of `_from`. | |
* | |
* @param _from the address of the sender | |
* @param _value the amount of money to burn | |
*/ | |
function burnFrom(address _from, uint256 _value) returns (bool success) { | |
require(balanceOf[_from] >= _value); // Check if the targeted balance is enough | |
require(_value <= allowance[_from][msg.sender]); // Check allowance | |
balanceOf[_from] -= _value; // Subtract from the targeted balance | |
allowance[_from][msg.sender] -= _value; // Subtract from the sender's allowance | |
totalSupply -= _value; // Update totalSupply | |
Burn(_from, _value); | |
return true; | |
} | |
} |
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pragma solidity ^0.4.16; | |
/// @title Multisignature wallet - Allows multiple parties to agree on transactions before execution. | |
/// @author Stefan George - <stefan.george@consensys.net> | |
contract MultiSigWallet { | |
event Confirmation(address sender, bytes32 transactionHash); | |
event Revocation(address sender, bytes32 transactionHash); | |
event Submission(bytes32 transactionHash); | |
event Execution(bytes32 transactionHash); | |
event Deposit(address sender, uint value); | |
event OwnerAddition(address owner); | |
event OwnerRemoval(address owner); | |
event RequiredUpdate(uint required); | |
mapping (bytes32 => Transaction) public transactions; | |
mapping (bytes32 => mapping (address => bool)) public confirmations; | |
mapping (address => bool) public isOwner; | |
address[] owners; | |
bytes32[] transactionList; | |
uint public required; | |
struct Transaction { | |
address destination; | |
uint value; | |
bytes data; | |
uint nonce; | |
bool executed; | |
} | |
modifier onlyWallet() { | |
if (msg.sender != address(this)) | |
throw; | |
_; | |
} | |
modifier signaturesFromOwners(bytes32 transactionHash, uint8[] v, bytes32[] rs) { | |
for (uint i=0; i<v.length; i++) | |
if (!isOwner[ecrecover(transactionHash, v[i], rs[i], rs[v.length + i])]) | |
throw; | |
_; | |
} | |
modifier ownerDoesNotExist(address owner) { | |
if (isOwner[owner]) | |
throw; | |
_; | |
} | |
modifier ownerExists(address owner) { | |
if (!isOwner[owner]) | |
throw; | |
_; | |
} | |
modifier confirmed(bytes32 transactionHash, address owner) { | |
if (!confirmations[transactionHash][owner]) | |
throw; | |
_; | |
} | |
modifier notConfirmed(bytes32 transactionHash, address owner) { | |
if (confirmations[transactionHash][owner]) | |
throw; | |
_; | |
} | |
modifier notExecuted(bytes32 transactionHash) { | |
if (transactions[transactionHash].executed) | |
throw; | |
_; | |
} | |
modifier notNull(address destination) { | |
if (destination == 0) | |
throw; | |
_; | |
} | |
modifier validRequired(uint _ownerCount, uint _required) { | |
if ( _required > _ownerCount | |
|| _required == 0 | |
|| _ownerCount == 0) | |
throw; | |
_; | |
} | |
function addOwner(address owner) | |
external | |
onlyWallet | |
ownerDoesNotExist(owner) | |
{ | |
isOwner[owner] = true; | |
owners.push(owner); | |
OwnerAddition(owner); | |
} | |
function removeOwner(address owner) | |
external | |
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) | |
updateRequired(owners.length); | |
OwnerRemoval(owner); | |
} | |
function updateRequired(uint _required) | |
public | |
onlyWallet | |
validRequired(owners.length, _required) | |
{ | |
required = _required; | |
RequiredUpdate(_required); | |
} | |
function addTransaction(address destination, uint value, bytes data, uint nonce) | |
private | |
notNull(destination) | |
returns (bytes32 transactionHash) | |
{ | |
transactionHash = sha3(destination, value, data, nonce); | |
if (transactions[transactionHash].destination == 0) { | |
transactions[transactionHash] = Transaction({ | |
destination: destination, | |
value: value, | |
data: data, | |
nonce: nonce, | |
executed: false | |
}); | |
transactionList.push(transactionHash); | |
Submission(transactionHash); | |
} | |
} | |
function submitTransaction(address destination, uint value, bytes data, uint nonce) | |
external | |
returns (bytes32 transactionHash) | |
{ | |
transactionHash = addTransaction(destination, value, data, nonce); | |
confirmTransaction(transactionHash); | |
} | |
function submitTransactionWithSignatures(address destination, uint value, bytes data, uint nonce, uint8[] v, bytes32[] rs) | |
external | |
returns (bytes32 transactionHash) | |
{ | |
transactionHash = addTransaction(destination, value, data, nonce); | |
confirmTransactionWithSignatures(transactionHash, v, rs); | |
} | |
function addConfirmation(bytes32 transactionHash, address owner) | |
private | |
notConfirmed(transactionHash, owner) | |
{ | |
confirmations[transactionHash][owner] = true; | |
Confirmation(owner, transactionHash); | |
} | |
function confirmTransaction(bytes32 transactionHash) | |
public | |
ownerExists(msg.sender) | |
{ | |
addConfirmation(transactionHash, msg.sender); | |
executeTransaction(transactionHash); | |
} | |
function confirmTransactionWithSignatures(bytes32 transactionHash, uint8[] v, bytes32[] rs) | |
public | |
signaturesFromOwners(transactionHash, v, rs) | |
{ | |
for (uint i=0; i<v.length; i++) | |
addConfirmation(transactionHash, ecrecover(transactionHash, v[i], rs[i], rs[i + v.length])); | |
executeTransaction(transactionHash); | |
} | |
function executeTransaction(bytes32 transactionHash) | |
public | |
notExecuted(transactionHash) | |
{ | |
if (isConfirmed(transactionHash)) { | |
Transaction tx = transactions[transactionHash]; | |
tx.executed = true; | |
if (!tx.destination.call.value(tx.value)(tx.data)) | |
throw; | |
Execution(transactionHash); | |
} | |
} | |
function revokeConfirmation(bytes32 transactionHash) | |
external | |
ownerExists(msg.sender) | |
confirmed(transactionHash, msg.sender) | |
notExecuted(transactionHash) | |
{ | |
confirmations[transactionHash][msg.sender] = false; | |
Revocation(msg.sender, transactionHash); | |
} | |
function MultiSigWallet(address[] _owners, uint _required) | |
validRequired(_owners.length, _required) | |
{ | |
for (uint i=0; i<_owners.length; i++) | |
isOwner[_owners[i]] = true; | |
owners = _owners; | |
required = _required; | |
} | |
function() | |
payable | |
{ | |
if (msg.value > 0) | |
Deposit(msg.sender, msg.value); | |
} | |
function isConfirmed(bytes32 transactionHash) | |
public | |
constant | |
returns (bool) | |
{ | |
uint count = 0; | |
for (uint i=0; i<owners.length; i++) | |
if (confirmations[transactionHash][owners[i]]) | |
count += 1; | |
if (count == required) | |
return true; | |
} | |
function confirmationCount(bytes32 transactionHash) | |
external | |
constant | |
returns (uint count) | |
{ | |
for (uint i=0; i<owners.length; i++) | |
if (confirmations[transactionHash][owners[i]]) | |
count += 1; | |
} | |
function filterTransactions(bool isPending) | |
private | |
returns (bytes32[] _transactionList) | |
{ | |
bytes32[] memory _transactionListTemp = new bytes32[](transactionList.length); | |
uint count = 0; | |
for (uint i=0; i<transactionList.length; i++) | |
if ( isPending && !transactions[transactionList[i]].executed | |
|| !isPending && transactions[transactionList[i]].executed) | |
{ | |
_transactionListTemp[count] = transactionList[i]; | |
count += 1; | |
} | |
_transactionList = new bytes32[](count); | |
for (i=0; i<count; i++) | |
if (_transactionListTemp[i] > 0) | |
_transactionList[i] = _transactionListTemp[i]; | |
} | |
function getPendingTransactions() | |
external | |
constant | |
returns (bytes32[] _transactionList) | |
{ | |
return filterTransactions(true); | |
} | |
function getExecutedTransactions() | |
external | |
constant | |
returns (bytes32[] _transactionList) | |
{ | |
return filterTransactions(false); | |
} | |
} |
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