Contract Name:
District0xNetworkToken
Contract Source Code:
File 1 of 1 : District0xNetworkToken
pragma solidity ^0.4.11;
library SafeMath {
function mul(uint a, uint b) internal returns (uint) {
uint c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint a, uint b) internal returns (uint) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint a, uint b) internal returns (uint) {
assert(b <= a);
return a - b;
}
function add(uint a, uint b) internal returns (uint) {
uint c = a + b;
assert(c >= a);
return c;
}
function max64(uint64 a, uint64 b) internal constant returns (uint64) {
return a >= b ? a : b;
}
function min64(uint64 a, uint64 b) internal constant returns (uint64) {
return a < b ? a : b;
}
function max256(uint256 a, uint256 b) internal constant returns (uint256) {
return a >= b ? a : b;
}
function min256(uint256 a, uint256 b) internal constant returns (uint256) {
return a < b ? a : b;
}
function assert(bool assertion) internal {
if (!assertion) {
throw;
}
}
}
contract Ownable {
/// @dev `owner` is the only address that can call a function with this
/// modifier
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
address public owner;
/// @notice The Constructor assigns the message sender to be `owner`
function Ownable() {
owner = msg.sender;
}
address public newOwner;
/// @notice `owner` can step down and assign some other address to this role
/// @param _newOwner The address of the new owner.
function changeOwner(address _newOwner) onlyOwner {
newOwner = _newOwner;
}
function acceptOwnership() {
if (msg.sender == newOwner) {
owner = newOwner;
}
}
}
contract Pausable is Ownable {
bool public stopped;
event onEmergencyChanged(bool isStopped);
modifier stopInEmergency {
if (stopped) {
throw;
}
_;
}
modifier onlyInEmergency {
if (!stopped) {
throw;
}
_;
}
// called by the owner on emergency, triggers stopped state
function emergencyStop() external onlyOwner {
stopped = true;
onEmergencyChanged(stopped);
}
// called by the owner on end of emergency, returns to normal state
function release() external onlyOwner onlyInEmergency {
stopped = false;
onEmergencyChanged(stopped);
}
}
contract ERC20Basic {
function totalSupply() constant returns (uint);
function balanceOf(address who) constant returns (uint);
function transfer(address to, uint value) returns (bool);
event Transfer(address indexed from, address indexed to, uint value);
}
contract ERC20 is ERC20Basic {
mapping(address => uint) balances;
function allowance(address owner, address spender) constant returns (uint);
function transferFrom(address from, address to, uint value) returns (bool);
function approve(address spender, uint value) returns (bool);
function approveAndCall(address spender, uint256 value, bytes extraData) returns (bool);
event Approval(address indexed owner, address indexed spender, uint value);
function doTransfer(address _from, address _to, uint _amount) internal returns(bool);
}
contract GrantsControlled {
modifier onlyGrantsController { if (msg.sender != grantsController) throw; _; }
address public grantsController;
function GrantsControlled() { grantsController = msg.sender;}
function changeGrantsController(address _newController) onlyGrantsController {
grantsController = _newController;
}
}
contract LimitedTransferToken is ERC20 {
// Checks whether it can transfer or otherwise throws.
modifier canTransfer(address _sender, uint _value) {
if (_value > transferableTokens(_sender, uint64(now))) throw;
_;
}
// Checks modifier and allows transfer if tokens are not locked.
function transfer(address _to, uint _value) canTransfer(msg.sender, _value) returns (bool) {
return super.transfer(_to, _value);
}
// Checks modifier and allows transfer if tokens are not locked.
function transferFrom(address _from, address _to, uint _value) canTransfer(_from, _value) returns (bool) {
return super.transferFrom(_from, _to, _value);
}
// Default transferable tokens function returns all tokens for a holder (no limit).
function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
return balanceOf(holder);
}
}
contract Controlled {
/// @notice The address of the controller is the only address that can call
/// a function with this modifier
modifier onlyController { if (msg.sender != controller) throw; _; }
address public controller;
function Controlled() { controller = msg.sender;}
/// @notice Changes the controller of the contract
/// @param _newController The new controller of the contract
function changeController(address _newController) onlyController {
controller = _newController;
}
}
contract MiniMeToken is ERC20, Controlled {
using SafeMath for uint;
string public name; //The Token's name: e.g. DigixDAO Tokens
uint8 public decimals; //Number of decimals of the smallest unit
string public symbol; //An identifier: e.g. REP
string public version = 'MMT_0.1'; //An arbitrary versioning scheme
/// @dev `Checkpoint` is the structure that attaches a block number to a
/// given value, the block number attached is the one that last changed the
/// value
struct Checkpoint {
// `fromBlock` is the block number that the value was generated from
uint128 fromBlock;
// `value` is the amount of tokens at a specific block number
uint128 value;
}
// `parentToken` is the Token address that was cloned to produce this token;
// it will be 0x0 for a token that was not cloned
MiniMeToken public parentToken;
// `parentSnapShotBlock` is the block number from the Parent Token that was
// used to determine the initial distribution of the Clone Token
uint public parentSnapShotBlock;
// `creationBlock` is the block number that the Clone Token was created
uint public creationBlock;
// `balances` is the map that tracks the balance of each address, in this
// contract when the balance changes the block number that the change
// occurred is also included in the map
mapping (address => Checkpoint[]) balances;
// `allowed` tracks any extra transfer rights as in all ERC20 tokens
mapping (address => mapping (address => uint256)) allowed;
// Tracks the history of the `totalSupply` of the token
Checkpoint[] totalSupplyHistory;
// Flag that determines if the token is transferable or not.
bool public transfersEnabled;
// The factory used to create new clone tokens
MiniMeTokenFactory public tokenFactory;
////////////////
// Constructor
////////////////
/// @notice Constructor to create a MiniMeToken
/// @param _tokenFactory The address of the MiniMeTokenFactory contract that
/// will create the Clone token contracts, the token factory needs to be
/// deployed first
/// @param _parentToken Address of the parent token, set to 0x0 if it is a
/// new token
/// @param _parentSnapShotBlock Block of the parent token that will
/// determine the initial distribution of the clone token, set to 0 if it
/// is a new token
/// @param _tokenName Name of the new token
/// @param _decimalUnits Number of decimals of the new token
/// @param _tokenSymbol Token Symbol for the new token
/// @param _transfersEnabled If true, tokens will be able to be transferred
function MiniMeToken(
address _tokenFactory,
address _parentToken,
uint _parentSnapShotBlock,
string _tokenName,
uint8 _decimalUnits,
string _tokenSymbol,
bool _transfersEnabled
) {
tokenFactory = MiniMeTokenFactory(_tokenFactory);
name = _tokenName; // Set the name
decimals = _decimalUnits; // Set the decimals
symbol = _tokenSymbol; // Set the symbol
parentToken = MiniMeToken(_parentToken);
parentSnapShotBlock = _parentSnapShotBlock;
transfersEnabled = _transfersEnabled;
creationBlock = block.number;
}
///////////////////
// ERC20 Methods
///////////////////
/// @notice Send `_amount` tokens to `_to` from `msg.sender`
/// @param _to The address of the recipient
/// @param _amount The amount of tokens to be transferred
/// @return Whether the transfer was successful or not
function transfer(address _to, uint256 _amount) returns (bool success) {
if (!transfersEnabled) throw;
return doTransfer(msg.sender, _to, _amount);
}
/// @notice Send `_amount` tokens to `_to` from `_from` on the condition it
/// is approved by `_from`
/// @param _from The address holding the tokens being transferred
/// @param _to The address of the recipient
/// @param _amount The amount of tokens to be transferred
/// @return True if the transfer was successful
function transferFrom(address _from, address _to, uint256 _amount
) returns (bool success) {
// The controller of this contract can move tokens around at will,
// this is important to recognize! Confirm that you trust the
// controller of this contract, which in most situations should be
// another open source smart contract or 0x0
if (msg.sender != controller) {
if (!transfersEnabled) throw;
// The standard ERC 20 transferFrom functionality
if (allowed[_from][msg.sender] < _amount) return false;
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount);
}
return doTransfer(_from, _to, _amount);
}
/// @dev This is the actual transfer function in the token contract, it can
/// only be called by other functions in this contract.
/// @param _from The address holding the tokens being transferred
/// @param _to The address of the recipient
/// @param _amount The amount of tokens to be transferred
/// @return True if the transfer was successful
function doTransfer(address _from, address _to, uint _amount
) internal returns(bool) {
if (_amount == 0) {
return true;
}
if (parentSnapShotBlock >= block.number) throw;
// Do not allow transfer to 0x0 or the token contract itself
if ((_to == 0) || (_to == address(this))) throw;
// If the amount being transfered is more than the balance of the
// account the transfer returns false
var previousBalanceFrom = balanceOfAt(_from, block.number);
if (previousBalanceFrom < _amount) {
return false;
}
// Alerts the token controller of the transfer
if (isContract(controller)) {
if (!TokenController(controller).onTransfer(_from, _to, _amount))
throw;
}
// First update the balance array with the new value for the address
// sending the tokens
updateValueAtNow(balances[_from], previousBalanceFrom.sub(_amount));
// Then update the balance array with the new value for the address
// receiving the tokens
var previousBalanceTo = balanceOfAt(_to, block.number);
updateValueAtNow(balances[_to], previousBalanceTo.add(_amount));
// An event to make the transfer easy to find on the blockchain
Transfer(_from, _to, _amount);
return true;
}
/// @param _owner The address that's balance is being requested
/// @return The balance of `_owner` at the current block
function balanceOf(address _owner) constant returns (uint256 balance) {
return balanceOfAt(_owner, block.number);
}
/// @notice `msg.sender` approves `_spender` to spend `_amount` tokens on
/// its behalf. This is a modified version of the ERC20 approve function
/// to be a little bit safer
/// @param _spender The address of the account able to transfer the tokens
/// @param _amount The amount of tokens to be approved for transfer
/// @return True if the approval was successful
function approve(address _spender, uint256 _amount) returns (bool success) {
if (!transfersEnabled) throw;
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender,0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
if ((_amount!=0) && (allowed[msg.sender][_spender] !=0)) throw;
// Alerts the token controller of the approve function call
if (isContract(controller)) {
if (!TokenController(controller).onApprove(msg.sender, _spender, _amount))
throw;
}
allowed[msg.sender][_spender] = _amount;
Approval(msg.sender, _spender, _amount);
return true;
}
/// @dev This function makes it easy to read the `allowed[]` map
/// @param _owner The address of the account that owns the token
/// @param _spender The address of the account able to transfer the tokens
/// @return Amount of remaining tokens of _owner that _spender is allowed
/// to spend
function allowance(address _owner, address _spender
) constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
/// @notice `msg.sender` approves `_spender` to send `_amount` tokens on
/// its behalf, and then a function is triggered in the contract that is
/// being approved, `_spender`. This allows users to use their tokens to
/// interact with contracts in one function call instead of two
/// @param _spender The address of the contract able to transfer the tokens
/// @param _amount The amount of tokens to be approved for transfer
/// @return True if the function call was successful
function approveAndCall(address _spender, uint256 _amount, bytes _extraData
) returns (bool success) {
if (!approve(_spender, _amount)) throw;
ApproveAndCallFallBack(_spender).receiveApproval(
msg.sender,
_amount,
this,
_extraData
);
return true;
}
/// @dev This function makes it easy to get the total number of tokens
/// @return The total number of tokens
function totalSupply() constant returns (uint) {
return totalSupplyAt(block.number);
}
////////////////
// Query balance and totalSupply in History
////////////////
/// @dev Queries the balance of `_owner` at a specific `_blockNumber`
/// @param _owner The address from which the balance will be retrieved
/// @param _blockNumber The block number when the balance is queried
/// @return The balance at `_blockNumber`
function balanceOfAt(address _owner, uint _blockNumber) constant
returns (uint) {
// These next few lines are used when the balance of the token is
// requested before a check point was ever created for this token, it
// requires that the `parentToken.balanceOfAt` be queried at the
// genesis block for that token as this contains initial balance of
// this token
if ((balances[_owner].length == 0)
|| (balances[_owner][0].fromBlock > _blockNumber)) {
if (address(parentToken) != 0) {
return parentToken.balanceOfAt(_owner, min(_blockNumber, parentSnapShotBlock));
} else {
// Has no parent
return 0;
}
// This will return the expected balance during normal situations
} else {
return getValueAt(balances[_owner], _blockNumber);
}
}
/// @notice Total amount of tokens at a specific `_blockNumber`.
/// @param _blockNumber The block number when the totalSupply is queried
/// @return The total amount of tokens at `_blockNumber`
function totalSupplyAt(uint _blockNumber) constant returns(uint) {
// These next few lines are used when the totalSupply of the token is
// requested before a check point was ever created for this token, it
// requires that the `parentToken.totalSupplyAt` be queried at the
// genesis block for this token as that contains totalSupply of this
// token at this block number.
if ((totalSupplyHistory.length == 0)
|| (totalSupplyHistory[0].fromBlock > _blockNumber)) {
if (address(parentToken) != 0) {
return parentToken.totalSupplyAt(min(_blockNumber, parentSnapShotBlock));
} else {
return 0;
}
// This will return the expected totalSupply during normal situations
} else {
return getValueAt(totalSupplyHistory, _blockNumber);
}
}
////////////////
// Clone Token Method
////////////////
/// @notice Creates a new clone token with the initial distribution being
/// this token at `_snapshotBlock`
/// @param _cloneTokenName Name of the clone token
/// @param _cloneDecimalUnits Number of decimals of the smallest unit
/// @param _cloneTokenSymbol Symbol of the clone token
/// @param _snapshotBlock Block when the distribution of the parent token is
/// copied to set the initial distribution of the new clone token;
/// if the block is zero than the actual block, the current block is used
/// @param _transfersEnabled True if transfers are allowed in the clone
/// @return The address of the new MiniMeToken Contract
function createCloneToken(
string _cloneTokenName,
uint8 _cloneDecimalUnits,
string _cloneTokenSymbol,
uint _snapshotBlock,
bool _transfersEnabled
) returns(address) {
if (_snapshotBlock == 0) _snapshotBlock = block.number;
MiniMeToken cloneToken = tokenFactory.createCloneToken(
this,
_snapshotBlock,
_cloneTokenName,
_cloneDecimalUnits,
_cloneTokenSymbol,
_transfersEnabled
);
cloneToken.changeController(msg.sender);
// An event to make the token easy to find on the blockchain
NewCloneToken(address(cloneToken), _snapshotBlock);
return address(cloneToken);
}
////////////////
// Generate and destroy tokens
////////////////
/// @notice Generates `_amount` tokens that are assigned to `_owner`
/// @param _owner The address that will be assigned the new tokens
/// @param _amount The quantity of tokens generated
/// @return True if the tokens are generated correctly
function generateTokens(address _owner, uint _amount
) onlyController returns (bool) {
uint curTotalSupply = getValueAt(totalSupplyHistory, block.number);
updateValueAtNow(totalSupplyHistory, curTotalSupply.add(_amount));
var previousBalanceTo = balanceOf(_owner);
updateValueAtNow(balances[_owner], previousBalanceTo.add(_amount));
Transfer(0, _owner, _amount);
return true;
}
/// @notice Burns `_amount` tokens from `_owner`
/// @param _owner The address that will lose the tokens
/// @param _amount The quantity of tokens to burn
/// @return True if the tokens are burned correctly
function destroyTokens(address _owner, uint _amount
) onlyController returns (bool) {
uint curTotalSupply = getValueAt(totalSupplyHistory, block.number);
if (curTotalSupply < _amount) throw;
updateValueAtNow(totalSupplyHistory, curTotalSupply.sub(_amount));
var previousBalanceFrom = balanceOf(_owner);
if (previousBalanceFrom < _amount) throw;
updateValueAtNow(balances[_owner], previousBalanceFrom.sub(_amount));
Transfer(_owner, 0, _amount);
return true;
}
////////////////
// Enable tokens transfers
////////////////
/// @notice Enables token holders to transfer their tokens freely if true
/// @param _transfersEnabled True if transfers are allowed in the clone
function enableTransfers(bool _transfersEnabled) onlyController {
transfersEnabled = _transfersEnabled;
}
////////////////
// Internal helper functions to query and set a value in a snapshot array
////////////////
/// @dev `getValueAt` retrieves the number of tokens at a given block number
/// @param checkpoints The history of values being queried
/// @param _block The block number to retrieve the value at
/// @return The number of tokens being queried
function getValueAt(Checkpoint[] storage checkpoints, uint _block
) constant internal returns (uint) {
if (checkpoints.length == 0) return 0;
// Shortcut for the actual value
if (_block >= checkpoints[checkpoints.length-1].fromBlock)
return checkpoints[checkpoints.length-1].value;
if (_block < checkpoints[0].fromBlock) return 0;
// Binary search of the value in the array
uint min = 0;
uint max = checkpoints.length-1;
while (max > min) {
uint mid = (max + min + 1)/ 2;
if (checkpoints[mid].fromBlock<=_block) {
min = mid;
} else {
max = mid-1;
}
}
return checkpoints[min].value;
}
/// @dev `updateValueAtNow` used to update the `balances` map and the
/// `totalSupplyHistory`
/// @param checkpoints The history of data being updated
/// @param _value The new number of tokens
function updateValueAtNow(Checkpoint[] storage checkpoints, uint _value
) internal {
if ((checkpoints.length == 0)
|| (checkpoints[checkpoints.length -1].fromBlock < block.number)) {
Checkpoint newCheckPoint = checkpoints[ checkpoints.length++ ];
newCheckPoint.fromBlock = uint128(block.number);
newCheckPoint.value = uint128(_value);
} else {
Checkpoint oldCheckPoint = checkpoints[checkpoints.length-1];
oldCheckPoint.value = uint128(_value);
}
}
/// @dev Internal function to determine if an address is a contract
/// @param _addr The address being queried
/// @return True if `_addr` is a contract
function isContract(address _addr) constant internal returns(bool) {
uint size;
if (_addr == 0) return false;
assembly {
size := extcodesize(_addr)
}
return size>0;
}
/// @dev Helper function to return a min betwen the two uints
function min(uint a, uint b) internal returns (uint) {
return a < b ? a : b;
}
/// @notice The fallback function: If the contract's controller has not been
/// set to 0, then the `proxyPayment` method is called which relays the
/// ether and creates tokens as described in the token controller contract
function () payable {
if (isContract(controller)) {
if (! TokenController(controller).proxyPayment.value(msg.value)(msg.sender))
throw;
} else {
throw;
}
}
//////////
// Safety Methods
//////////
/// @notice This method can be used by the controller to extract mistakenly
/// sent tokens to this contract.
/// @param _token The address of the token contract that you want to recover
/// set to 0 in case you want to extract ether.
/// @param _claimer Address that tokens will be send to
function claimTokens(address _token, address _claimer) onlyController {
if (_token == 0x0) {
_claimer.transfer(this.balance);
return;
}
ERC20Basic token = ERC20Basic(_token);
uint balance = token.balanceOf(this);
token.transfer(_claimer, balance);
ClaimedTokens(_token, _claimer, balance);
}
////////////////
// Events
////////////////
event ClaimedTokens(address indexed _token, address indexed _claimer, uint _amount);
event Transfer(address indexed _from, address indexed _to, uint256 _amount);
event NewCloneToken(address indexed _cloneToken, uint _snapshotBlock);
event Approval(
address indexed _owner,
address indexed _spender,
uint256 _amount
);
}
////////////////
// MiniMeTokenFactory
////////////////
/// @dev This contract is used to generate clone contracts from a contract.
/// In solidity this is the way to create a contract from a contract of the
/// same class
contract MiniMeTokenFactory {
/// @notice Update the DApp by creating a new token with new functionalities
/// the msg.sender becomes the controller of this clone token
/// @param _parentToken Address of the token being cloned
/// @param _snapshotBlock Block of the parent token that will
/// determine the initial distribution of the clone token
/// @param _tokenName Name of the new token
/// @param _decimalUnits Number of decimals of the new token
/// @param _tokenSymbol Token Symbol for the new token
/// @param _transfersEnabled If true, tokens will be able to be transferred
/// @return The address of the new token contract
function createCloneToken(
address _parentToken,
uint _snapshotBlock,
string _tokenName,
uint8 _decimalUnits,
string _tokenSymbol,
bool _transfersEnabled
) returns (MiniMeToken) {
MiniMeToken newToken = new MiniMeToken(
this,
_parentToken,
_snapshotBlock,
_tokenName,
_decimalUnits,
_tokenSymbol,
_transfersEnabled
);
newToken.changeController(msg.sender);
return newToken;
}
}
contract VestedToken is LimitedTransferToken, GrantsControlled {
using SafeMath for uint;
uint256 MAX_GRANTS_PER_ADDRESS = 20;
struct TokenGrant {
address granter; // 20 bytes
uint256 value; // 32 bytes
uint64 cliff;
uint64 vesting;
uint64 start; // 3 * 8 = 24 bytes
bool revokable;
bool burnsOnRevoke; // 2 * 1 = 2 bits? or 2 bytes?
} // total 78 bytes = 3 sstore per operation (32 per sstore)
mapping (address => TokenGrant[]) public grants;
event NewTokenGrant(address indexed from, address indexed to, uint256 value, uint256 grantId);
/**
* @dev Grant tokens to a specified address
* @param _to address The address which the tokens will be granted to.
* @param _value uint256 The amount of tokens to be granted.
* @param _start uint64 Time of the beginning of the grant.
* @param _cliff uint64 Time of the cliff period.
* @param _vesting uint64 The vesting period.
*/
function grantVestedTokens(
address _to,
uint256 _value,
uint64 _start,
uint64 _cliff,
uint64 _vesting,
bool _revokable,
bool _burnsOnRevoke
) onlyGrantsController public {
// Check for date inconsistencies that may cause unexpected behavior
if (_cliff < _start || _vesting < _cliff) {
throw;
}
if (tokenGrantsCount(_to) > MAX_GRANTS_PER_ADDRESS) throw; // To prevent a user being spammed and have his balance locked (out of gas attack when calculating vesting).
uint count = grants[_to].push(
TokenGrant(
_revokable ? msg.sender : 0, // avoid storing an extra 20 bytes when it is non-revokable
_value,
_cliff,
_vesting,
_start,
_revokable,
_burnsOnRevoke
)
);
transfer(_to, _value);
NewTokenGrant(msg.sender, _to, _value, count - 1);
}
/**
* @dev Revoke the grant of tokens of a specifed address.
* @param _holder The address which will have its tokens revoked.
* @param _grantId The id of the token grant.
*/
function revokeTokenGrant(address _holder, uint _grantId) public {
TokenGrant grant = grants[_holder][_grantId];
if (!grant.revokable) { // Check if grant was revokable
throw;
}
if (grant.granter != msg.sender) { // Only granter can revoke it
throw;
}
address receiver = grant.burnsOnRevoke ? 0xdead : msg.sender;
uint256 nonVested = nonVestedTokens(grant, uint64(now));
// remove grant from array
delete grants[_holder][_grantId];
grants[_holder][_grantId] = grants[_holder][grants[_holder].length.sub(1)];
grants[_holder].length -= 1;
// This will call MiniMe's doTransfer method, so token is transferred according to
// MiniMe Token logic
doTransfer(_holder, receiver, nonVested);
Transfer(_holder, receiver, nonVested);
}
/**
* @dev Revoke all grants of tokens of a specifed address.
* @param _holder The address which will have its tokens revoked.
*/
function revokeAllTokenGrants(address _holder) {
var grandsCount = tokenGrantsCount(_holder);
for (uint i = 0; i < grandsCount; i++) {
revokeTokenGrant(_holder, 0);
}
}
/**
* @dev Calculate the total amount of transferable tokens of a holder at a given time
* @param holder address The address of the holder
* @param time uint64 The specific time.
* @return An uint representing a holder's total amount of transferable tokens.
*/
function transferableTokens(address holder, uint64 time) constant public returns (uint256) {
uint256 grantIndex = tokenGrantsCount(holder);
if (grantIndex == 0) return balanceOf(holder); // shortcut for holder without grants
// Iterate through all the grants the holder has, and add all non-vested tokens
uint256 nonVested = 0;
for (uint256 i = 0; i < grantIndex; i++) {
nonVested = SafeMath.add(nonVested, nonVestedTokens(grants[holder][i], time));
}
// Balance - totalNonVested is the amount of tokens a holder can transfer at any given time
uint256 vestedTransferable = SafeMath.sub(balanceOf(holder), nonVested);
// Return the minimum of how many vested can transfer and other value
// in case there are other limiting transferability factors (default is balanceOf)
return SafeMath.min256(vestedTransferable, super.transferableTokens(holder, time));
}
/**
* @dev Check the amount of grants that an address has.
* @param _holder The holder of the grants.
* @return A uint representing the total amount of grants.
*/
function tokenGrantsCount(address _holder) constant returns (uint index) {
return grants[_holder].length;
}
/**
* @dev Calculate amount of vested tokens at a specifc time.
* @param tokens uint256 The amount of tokens grantted.
* @param time uint64 The time to be checked
* @param start uint64 A time representing the begining of the grant
* @param cliff uint64 The cliff period.
* @param vesting uint64 The vesting period.
* @return An uint representing the amount of vested tokensof a specif grant.
* transferableTokens
* | _/-------- vestedTokens rect
* | _/
* | _/
* | _/
* | _/
* | /
* | .|
* | . |
* | . |
* | . |
* | . |
* | . |
* +===+===========+---------+----------> time
* Start Clift Vesting
*/
function calculateVestedTokens(
uint256 tokens,
uint256 time,
uint256 start,
uint256 cliff,
uint256 vesting) constant returns (uint256)
{
// Shortcuts for before cliff and after vesting cases.
if (time < cliff) return 0;
if (time >= vesting) return tokens;
// Interpolate all vested tokens.
// As before cliff the shortcut returns 0, we can use just calculate a value
// in the vesting rect (as shown in above's figure)
// vestedTokens = tokens * (time - start) / (vesting - start)
uint256 vestedTokens = SafeMath.div(
SafeMath.mul(
tokens,
SafeMath.sub(time, start)
),
SafeMath.sub(vesting, start)
);
return vestedTokens;
}
/**
* @dev Get all information about a specifc grant.
* @param _holder The address which will have its tokens revoked.
* @param _grantId The id of the token grant.
* @return Returns all the values that represent a TokenGrant(address, value, start, cliff,
* revokability, burnsOnRevoke, and vesting) plus the vested value at the current time.
*/
function tokenGrant(address _holder, uint _grantId) constant returns (address granter, uint256 value, uint256 vested, uint64 start, uint64 cliff, uint64 vesting, bool revokable, bool burnsOnRevoke) {
TokenGrant grant = grants[_holder][_grantId];
granter = grant.granter;
value = grant.value;
start = grant.start;
cliff = grant.cliff;
vesting = grant.vesting;
revokable = grant.revokable;
burnsOnRevoke = grant.burnsOnRevoke;
vested = vestedTokens(grant, uint64(now));
}
/**
* @dev Get the amount of vested tokens at a specific time.
* @param grant TokenGrant The grant to be checked.
* @param time The time to be checked
* @return An uint representing the amount of vested tokens of a specific grant at a specific time.
*/
function vestedTokens(TokenGrant grant, uint64 time) private constant returns (uint256) {
return calculateVestedTokens(
grant.value,
uint256(time),
uint256(grant.start),
uint256(grant.cliff),
uint256(grant.vesting)
);
}
/**
* @dev Calculate the amount of non vested tokens at a specific time.
* @param grant TokenGrant The grant to be checked.
* @param time uint64 The time to be checked
* @return An uint representing the amount of non vested tokens of a specifc grant on the
* passed time frame.
*/
function nonVestedTokens(TokenGrant grant, uint64 time) private constant returns (uint256) {
return grant.value.sub(vestedTokens(grant, time));
}
/**
* @dev Calculate the date when the holder can trasfer all its tokens
* @param holder address The address of the holder
* @return An uint representing the date of the last transferable tokens.
*/
function lastTokenIsTransferableDate(address holder) constant public returns (uint64 date) {
date = uint64(now);
uint256 grantIndex = grants[holder].length;
for (uint256 i = 0; i < grantIndex; i++) {
date = SafeMath.max64(grants[holder][i].vesting, date);
}
}
}
contract ApproveAndCallFallBack {
function receiveApproval(address from, uint256 _amount, address _token, bytes _data);
}
contract TokenController {
/// @notice Called when `_owner` sends ether to the MiniMe Token contract
/// @param _owner The address that sent the ether to create tokens
/// @return True if the ether is accepted, false if it throws
function proxyPayment(address _owner) payable returns(bool);
/// @notice Notifies the controller about a token transfer allowing the
/// controller to react if desired
/// @param _from The origin of the transfer
/// @param _to The destination of the transfer
/// @param _amount The amount of the transfer
/// @return False if the controller does not authorize the transfer
function onTransfer(address _from, address _to, uint _amount) returns(bool);
/// @notice Notifies the controller about an approval allowing the
/// controller to react if desired
/// @param _owner The address that calls `approve()`
/// @param _spender The spender in the `approve()` call
/// @param _amount The amount in the `approve()` call
/// @return False if the controller does not authorize the approval
function onApprove(address _owner, address _spender, uint _amount)
returns(bool);
}
contract District0xNetworkToken is MiniMeToken, VestedToken {
function District0xNetworkToken(address _controller, address _tokenFactory)
MiniMeToken(
_tokenFactory,
0x0, // no parent token
0, // no snapshot block number from parent
"district0x Network Token", // Token name
18, // Decimals
"DNT", // Symbol
true // Enable transfers
)
{
changeController(_controller);
changeGrantsController(_controller);
}
}
contract HasNoTokens is Ownable {
District0xNetworkToken public district0xNetworkToken;
/**
* @dev Reject all ERC23 compatible tokens
* @param from_ address The address that is transferring the tokens
* @param value_ uint256 the amount of the specified token
* @param data_ Bytes The data passed from the caller.
*/
function tokenFallback(address from_, uint256 value_, bytes data_) external {
throw;
}
function isTokenSaleToken(address tokenAddr) returns(bool);
/**
* @dev Reclaim all ERC20Basic compatible tokens
* @param tokenAddr address The address of the token contract
*/
function reclaimToken(address tokenAddr) external onlyOwner {
require(!isTokenSaleToken(tokenAddr));
ERC20Basic tokenInst = ERC20Basic(tokenAddr);
uint256 balance = tokenInst.balanceOf(this);
tokenInst.transfer(msg.sender, balance);
}
}
contract District0xContribution is Pausable, HasNoTokens, TokenController {
using SafeMath for uint;
District0xNetworkToken public district0xNetworkToken;
address public multisigWallet; // Wallet that receives all sale funds
address public founder1; // Wallet of founder 1
address public founder2; // Wallet of founder 2
address public earlySponsor; // Wallet of early sponsor
address[] public advisers; // 4 Wallets of advisors
uint public constant FOUNDER1_STAKE = 119000000 ether; // 119M DNT
uint public constant FOUNDER2_STAKE = 79000000 ether; // 79M DNT
uint public constant EARLY_CONTRIBUTOR_STAKE = 5000000 ether; // 5M DNT
uint public constant ADVISER_STAKE = 5000000 ether; // 5M DNT
uint public constant ADVISER_STAKE2 = 1000000 ether; // 1M DNT
uint public constant COMMUNITY_ADVISERS_STAKE = 5000000 ether; // 5M DNT
uint public constant CONTRIB_PERIOD1_STAKE = 600000000 ether; // 600M DNT
uint public constant CONTRIB_PERIOD2_STAKE = 140000000 ether; // 140M DNT
uint public constant CONTRIB_PERIOD3_STAKE = 40000000 ether; // 40M DNT
uint public minContribAmount = 0.01 ether; // 0.01 ether
uint public maxGasPrice = 50000000000; // 50 GWei
uint public constant TEAM_VESTING_CLIFF = 24 weeks; // 6 months vesting cliff for founders and advisors, except community advisors
uint public constant TEAM_VESTING_PERIOD = 96 weeks; // 2 years vesting period for founders and advisors, except community advisors
uint public constant EARLY_CONTRIBUTOR_VESTING_CLIFF = 12 weeks; // 3 months vesting cliff for early sponsor
uint public constant EARLY_CONTRIBUTOR_VESTING_PERIOD = 24 weeks; // 6 months vesting cliff for early sponsor
bool public tokenTransfersEnabled = false; // DNT token transfers will be enabled manually
// after first contribution period
// Can't be disabled back
struct Contributor {
uint amount; // Amount of ETH contributed by an address in given contribution period
bool isCompensated; // Whether this contributor received DNT token for ETH contribution
uint amountCompensated; // Amount of DNT received. Not really needed to store,
// but stored for accounting and security purposes
}
uint public softCapAmount; // Soft cap of contribution period in wei
uint public afterSoftCapDuration; // Number of seconds to the end of sale from the moment of reaching soft cap (unless reaching hardcap)
uint public hardCapAmount; // When reached this amount of wei, the contribution will end instantly
uint public startTime; // Start time of contribution period in UNIX time
uint public endTime; // End time of contribution period in UNIX time
bool public isEnabled; // If contribution period was enabled by multisignature
bool public softCapReached; // If soft cap was reached
bool public hardCapReached; // If hard cap was reached
uint public totalContributed; // Total amount of ETH contributed in given period
address[] public contributorsKeys; // Addresses of all contributors in given contribution period
mapping (address => Contributor) public contributors;
event onContribution(uint totalContributed, address indexed contributor, uint amount,
uint contributorsCount);
event onSoftCapReached(uint endTime);
event onHardCapReached(uint endTime);
event onCompensated(address indexed contributor, uint amount);
modifier onlyMultisig() {
require(multisigWallet == msg.sender);
_;
}
function District0xContribution(
address _multisigWallet,
address _founder1,
address _founder2,
address _earlySponsor,
address[] _advisers
) {
require(_advisers.length == 5);
multisigWallet = _multisigWallet;
founder1 = _founder1;
founder2 = _founder2;
earlySponsor = _earlySponsor;
advisers = _advisers;
}
// @notice Returns true if contribution period is currently running
function isContribPeriodRunning() constant returns (bool) {
return !hardCapReached &&
isEnabled &&
startTime <= now &&
endTime > now;
}
function contribute()
payable
stopInEmergency
{
contributeWithAddress(msg.sender);
}
// @notice Function to participate in contribution period
// Amounts from the same address should be added up
// If soft or hard cap is reached, end time should be modified
// Funds should be transferred into multisig wallet
// @param contributor Address that will receive DNT token
function contributeWithAddress(address contributor)
payable
stopInEmergency
{
require(tx.gasprice <= maxGasPrice);
require(msg.value >= minContribAmount);
require(isContribPeriodRunning());
uint contribValue = msg.value;
uint excessContribValue = 0;
uint oldTotalContributed = totalContributed;
totalContributed = oldTotalContributed.add(contribValue);
uint newTotalContributed = totalContributed;
// Soft cap was reached
if (newTotalContributed >= softCapAmount &&
oldTotalContributed < softCapAmount)
{
softCapReached = true;
endTime = afterSoftCapDuration.add(now);
onSoftCapReached(endTime);
}
// Hard cap was reached
if (newTotalContributed >= hardCapAmount &&
oldTotalContributed < hardCapAmount)
{
hardCapReached = true;
endTime = now;
onHardCapReached(endTime);
// Everything above hard cap will be sent back to contributor
excessContribValue = newTotalContributed.sub(hardCapAmount);
contribValue = contribValue.sub(excessContribValue);
totalContributed = hardCapAmount;
}
if (contributors[contributor].amount == 0) {
contributorsKeys.push(contributor);
}
contributors[contributor].amount = contributors[contributor].amount.add(contribValue);
multisigWallet.transfer(contribValue);
if (excessContribValue > 0) {
msg.sender.transfer(excessContribValue);
}
onContribution(newTotalContributed, contributor, contribValue, contributorsKeys.length);
}
// @notice This method is called by owner after contribution period ends, to distribute DNT in proportional manner
// Each contributor should receive DNT just once even if this method is called multiple times
// In case of many contributors must be able to compensate contributors in paginational way, otherwise might
// run out of gas if wanted to compensate all on one method call. Therefore parameters offset and limit
// @param periodIndex Index of contribution period (0-2)
// @param offset Number of first contributors to skip.
// @param limit Max number of contributors compensated on this call
function compensateContributors(uint offset, uint limit)
onlyOwner
{
require(isEnabled);
require(endTime < now);
uint i = offset;
uint compensatedCount = 0;
uint contributorsCount = contributorsKeys.length;
uint ratio = CONTRIB_PERIOD1_STAKE
.mul(1000000000000000000)
.div(totalContributed);
while (i < contributorsCount && compensatedCount < limit) {
address contributorAddress = contributorsKeys[i];
if (!contributors[contributorAddress].isCompensated) {
uint amountContributed = contributors[contributorAddress].amount;
contributors[contributorAddress].isCompensated = true;
contributors[contributorAddress].amountCompensated =
amountContributed.mul(ratio).div(1000000000000000000);
district0xNetworkToken.transfer(contributorAddress, contributors[contributorAddress].amountCompensated);
onCompensated(contributorAddress, contributors[contributorAddress].amountCompensated);
compensatedCount++;
}
i++;
}
}
// @notice Method for setting up contribution period
// Only owner should be able to execute
// Setting first contribution period sets up vesting for founders & advisors
// Contribution period should still not be enabled after calling this method
// @param softCapAmount Soft Cap in wei
// @param afterSoftCapDuration Number of seconds till the end of sale in the moment of reaching soft cap (unless reaching hard cap)
// @param hardCapAmount Hard Cap in wei
// @param startTime Contribution start time in UNIX time
// @param endTime Contribution end time in UNIX time
function setContribPeriod(
uint _softCapAmount,
uint _afterSoftCapDuration,
uint _hardCapAmount,
uint _startTime,
uint _endTime
)
onlyOwner
{
require(_softCapAmount > 0);
require(_hardCapAmount > _softCapAmount);
require(_afterSoftCapDuration > 0);
require(_startTime > now);
require(_endTime > _startTime);
require(!isEnabled);
softCapAmount = _softCapAmount;
afterSoftCapDuration = _afterSoftCapDuration;
hardCapAmount = _hardCapAmount;
startTime = _startTime;
endTime = _endTime;
district0xNetworkToken.revokeAllTokenGrants(founder1);
district0xNetworkToken.revokeAllTokenGrants(founder2);
district0xNetworkToken.revokeAllTokenGrants(earlySponsor);
for (uint j = 0; j < advisers.length; j++) {
district0xNetworkToken.revokeAllTokenGrants(advisers[j]);
}
uint64 vestingDate = uint64(startTime.add(TEAM_VESTING_PERIOD));
uint64 cliffDate = uint64(startTime.add(TEAM_VESTING_CLIFF));
uint64 earlyContribVestingDate = uint64(startTime.add(EARLY_CONTRIBUTOR_VESTING_PERIOD));
uint64 earlyContribCliffDate = uint64(startTime.add(EARLY_CONTRIBUTOR_VESTING_CLIFF));
uint64 startDate = uint64(startTime);
district0xNetworkToken.grantVestedTokens(founder1, FOUNDER1_STAKE, startDate, cliffDate, vestingDate, true, false);
district0xNetworkToken.grantVestedTokens(founder2, FOUNDER2_STAKE, startDate, cliffDate, vestingDate, true, false);
district0xNetworkToken.grantVestedTokens(earlySponsor, EARLY_CONTRIBUTOR_STAKE, startDate, earlyContribCliffDate, earlyContribVestingDate, true, false);
district0xNetworkToken.grantVestedTokens(advisers[0], ADVISER_STAKE, startDate, cliffDate, vestingDate, true, false);
district0xNetworkToken.grantVestedTokens(advisers[1], ADVISER_STAKE, startDate, cliffDate, vestingDate, true, false);
district0xNetworkToken.grantVestedTokens(advisers[2], ADVISER_STAKE2, startDate, cliffDate, vestingDate, true, false);
district0xNetworkToken.grantVestedTokens(advisers[3], ADVISER_STAKE2, startDate, cliffDate, vestingDate, true, false);
// Community advisors stake has no vesting, but we set it up this way, so we can revoke it in case of
// re-setting up contribution period
district0xNetworkToken.grantVestedTokens(advisers[4], COMMUNITY_ADVISERS_STAKE, startDate, startDate, startDate, true, false);
}
// @notice Enables contribution period
// Must be executed by multisignature
function enableContribPeriod()
onlyMultisig
{
require(startTime > now);
isEnabled = true;
}
// @notice Sets new min. contribution amount
// Only owner can execute
// Cannot be executed while contribution period is running
// @param _minContribAmount new min. amount
function setMinContribAmount(uint _minContribAmount)
onlyOwner
{
require(_minContribAmount > 0);
require(startTime > now);
minContribAmount = _minContribAmount;
}
// @notice Sets new max gas price for contribution
// Only owner can execute
// Cannot be executed while contribution period is running
// @param _minContribAmount new min. amount
function setMaxGasPrice(uint _maxGasPrice)
onlyOwner
{
require(_maxGasPrice > 0);
require(startTime > now);
maxGasPrice = _maxGasPrice;
}
// @notice Sets District0xNetworkToken contract
// Generates all DNT tokens and assigns them to this contract
// If token contract has already generated tokens, do not generate again
// @param _district0xNetworkToken District0xNetworkToken address
function setDistrict0xNetworkToken(address _district0xNetworkToken)
onlyOwner
{
require(_district0xNetworkToken != 0x0);
require(!isEnabled);
district0xNetworkToken = District0xNetworkToken(_district0xNetworkToken);
if (district0xNetworkToken.totalSupply() == 0) {
district0xNetworkToken.generateTokens(this, FOUNDER1_STAKE
.add(FOUNDER2_STAKE)
.add(EARLY_CONTRIBUTOR_STAKE)
.add(ADVISER_STAKE.mul(2))
.add(ADVISER_STAKE2.mul(2))
.add(COMMUNITY_ADVISERS_STAKE)
.add(CONTRIB_PERIOD1_STAKE));
district0xNetworkToken.generateTokens(multisigWallet, CONTRIB_PERIOD2_STAKE
.add(CONTRIB_PERIOD3_STAKE));
}
}
// @notice Enables transfers of DNT
// Will be executed after first contribution period by owner
function enableDistrict0xNetworkTokenTransfers()
onlyOwner
{
require(endTime < now);
tokenTransfersEnabled = true;
}
// @notice Method to claim tokens accidentally sent to a DNT contract
// Only multisig wallet can execute
// @param _token Address of claimed ERC20 Token
function claimTokensFromTokenDistrict0xNetworkToken(address _token)
onlyMultisig
{
district0xNetworkToken.claimTokens(_token, multisigWallet);
}
// @notice Kill method should not really be needed, but just in case
function kill(address _to) onlyMultisig external {
suicide(_to);
}
function()
payable
stopInEmergency
{
contributeWithAddress(msg.sender);
}
// MiniMe Controller default settings for allowing token transfers.
function proxyPayment(address _owner) payable public returns (bool) {
throw;
}
// Before transfers are enabled for everyone, only this contract is allowed to distribute DNT
function onTransfer(address _from, address _to, uint _amount) public returns (bool) {
return tokenTransfersEnabled || _from == address(this) || _to == address(this);
}
function onApprove(address _owner, address _spender, uint _amount) public returns (bool) {
return tokenTransfersEnabled;
}
function isTokenSaleToken(address tokenAddr) returns(bool) {
return district0xNetworkToken == tokenAddr;
}
/*
Following constant methods are used for tests and contribution web app
They don't impact logic of contribution contract, therefor DOES NOT NEED TO BE AUDITED
*/
// Used by contribution front-end to obtain contribution period properties
function getContribPeriod()
constant
returns (bool[3] boolValues, uint[8] uintValues)
{
boolValues[0] = isEnabled;
boolValues[1] = softCapReached;
boolValues[2] = hardCapReached;
uintValues[0] = softCapAmount;
uintValues[1] = afterSoftCapDuration;
uintValues[2] = hardCapAmount;
uintValues[3] = startTime;
uintValues[4] = endTime;
uintValues[5] = totalContributed;
uintValues[6] = contributorsKeys.length;
uintValues[7] = CONTRIB_PERIOD1_STAKE;
return (boolValues, uintValues);
}
// Used by contribution front-end to obtain contribution contract properties
function getConfiguration()
constant
returns (bool, address, address, address, address, address[] _advisers, bool, uint)
{
_advisers = new address[](advisers.length);
for (uint i = 0; i < advisers.length; i++) {
_advisers[i] = advisers[i];
}
return (stopped, multisigWallet, founder1, founder2, earlySponsor, _advisers, tokenTransfersEnabled,
maxGasPrice);
}
// Used by contribution front-end to obtain contributor's properties
function getContributor(address contributorAddress)
constant
returns(uint, bool, uint)
{
Contributor contributor = contributors[contributorAddress];
return (contributor.amount, contributor.isCompensated, contributor.amountCompensated);
}
// Function to verify if all contributors were compensated
function getUncompensatedContributors(uint offset, uint limit)
constant
returns (uint[] contributorIndexes)
{
uint contributorsCount = contributorsKeys.length;
if (limit == 0) {
limit = contributorsCount;
}
uint i = offset;
uint resultsCount = 0;
uint[] memory _contributorIndexes = new uint[](limit);
while (i < contributorsCount && resultsCount < limit) {
if (!contributors[contributorsKeys[i]].isCompensated) {
_contributorIndexes[resultsCount] = i;
resultsCount++;
}
i++;
}
contributorIndexes = new uint[](resultsCount);
for (i = 0; i < resultsCount; i++) {
contributorIndexes[i] = _contributorIndexes[i];
}
return contributorIndexes;
}
function getNow()
constant
returns(uint)
{
return now;
}
}