Contract Name:
LockedToken
Contract Source Code:
File 1 of 1 : LockedToken
pragma solidity ^0.4.18;
contract owned {
address public owner;
function owned() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address newOwner) onlyOwner public {
owner = newOwner;
}
}
interface tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData) public; }
contract TokenERC20 {
// Public variables of the token
string public name;
string public symbol;
uint8 public decimals = 18;
// 18 decimals is the strongly suggested default, avoid changing it
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 TokenERC20(
uint256 initialSupply,
string tokenName,
string tokenSymbol
) public {
totalSupply = initialSupply * 10 ** uint256(decimals); // Update total supply with the decimal amount
balanceOf[msg.sender] = totalSupply; // Give the creator all initial tokens
name = tokenName; // Set the name for display purposes
symbol = tokenSymbol; // Set the symbol for display purposes
}
/**
* Internal transfer, only can be called by this contract
*/
function _transfer(address _from, address _to, uint256 _value) internal {
// Prevent transfer to 0x0 address. Use burn() instead
require(_to != 0x0);
// Check if the sender has enough
require(balanceOf[_from] >= _value);
// Check for overflows
require(balanceOf[_to] + _value > balanceOf[_to]);
// Save this for an assertion in the future
uint256 previousBalances = balanceOf[_from] + balanceOf[_to];
// Subtract from the sender
balanceOf[_from] -= _value;
// Add the same to the recipient
balanceOf[_to] += _value;
Transfer(_from, _to, _value);
// Asserts are used to use static analysis to find bugs in your code. They should never fail
assert(balanceOf[_from] + balanceOf[_to] == previousBalances);
}
/**
* 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) public returns (bool ok){
_transfer(msg.sender, _to, _value);
return true;
}
/**
* 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) public 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)
public
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)
public
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) public 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 account
*
* 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) public 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;
}
}
contract SafeMath {
function safeMul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function safeDiv(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b > 0);
uint256 c = a / b;
assert(a == b * c + a % b);
return c;
}
function safeSub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function safeAdd(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c>=a && c>=b);
return c;
}
}
contract LockedToken is owned, TokenERC20, SafeMath {
struct TokenLocked {
uint256 amount;
uint256 startDate;
uint256 lastDate;
uint256 batches;
}
mapping (address => TokenLocked) internal lockedTokenOf;
mapping (address => bool) internal isLocked;
modifier canTransfer(address _sender, uint256 _value) {
require(_value <= spendableBalanceOf(_sender));
_;
}
function LockedToken (
uint256 initialSupply,
string tokenName,
string tokenSymbol
)TokenERC20(initialSupply, tokenName, tokenSymbol) public {}
function transfer(address _to, uint256 _value)
canTransfer(msg.sender, _value)
public
returns (bool success) {
return super.transfer(_to, _value);
}
function transferFrom(address _from, address _to, uint256 _value)
canTransfer(_from, _value)
public
returns (bool success) {
return super.transferFrom(_from, _to, _value);
}
function transferAndLock(
address _to,
uint256 _value,
uint256 _startDate,
uint256 _lastDate,
uint256 _batches)
onlyOwner public {
//doLock
require(_to != 0x0);
require(_startDate < _lastDate);
require(_batches > 0);
TokenLocked memory tokenLocked = TokenLocked(_value, _startDate, _lastDate, _batches);
lockedTokenOf[_to] = tokenLocked;
isLocked[_to] = true;
//doTransfer
super.transfer(_to, _value);
}
function spendableBalanceOf(address _holder) constant public returns (uint) {
return transferableTokens(_holder, uint64(now));
}
function transferableTokens(address holder, uint256 time) constant public returns (uint256) {
TokenLocked storage tokenLocked = lockedTokenOf[holder];
if (!isLocked[holder]) return balanceOf[holder];
uint256 amount = tokenLocked.amount;
uint256 startDate = tokenLocked.startDate;
uint256 lastDate = tokenLocked.lastDate;
uint256 batches = tokenLocked.batches;
if (time < startDate) return 0;
if (time >= lastDate) return balanceOf[holder];
//caculate transferableTokens
uint256 originalTransferableTokens = safeMul(safeDiv(amount, batches),
safeDiv(
safeMul(safeSub(time, startDate), batches),
safeSub(lastDate, startDate)
));
uint256 lockedAmount = safeSub(amount, originalTransferableTokens);
if (balanceOf[holder] <= lockedAmount) return 0;
uint256 actualTransferableTokens = safeSub(balanceOf[holder], lockedAmount);
return actualTransferableTokens;
}
function lastTokenIsTransferableDate(address holder) constant public returns(uint256 date) {
date = uint256(now);
if (!isLocked[holder]) return date;
TokenLocked storage tokenLocked = lockedTokenOf[holder];
return tokenLocked.lastDate;
}
function () payable public {
revert();
}
}