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June 20, 2018 07:14
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pragma solidity ^0.4.23; | |
/** | |
* @title ERC20 interface | |
*/ | |
contract ERC20 { | |
function totalSupply() | |
public view returns (uint256); | |
function balanceOf(address who) | |
public view returns (uint256); | |
function transfer(address to, uint256 value) | |
public returns (bool); | |
function allowance(address owner, address spender) | |
public view returns (uint256); | |
function transferFrom(address from, address to, uint256 value) | |
public returns (bool); | |
function approve(address spender, uint256 value) | |
public returns (bool); | |
event Approval( | |
address indexed owner, | |
address indexed spender, | |
uint256 value | |
); | |
event Transfer( | |
address indexed from, | |
address indexed to, | |
uint256 value); | |
} | |
/** | |
* @title Ownable | |
* @dev The Ownable contract has an owner address, and provides basic authorization control | |
* functions, this simplifies the implementation of "user permissions". | |
*/ | |
contract Ownable { | |
address public owner; | |
event OwnershipTransferred( | |
address indexed previousOwner, | |
address indexed newOwner | |
); | |
/** | |
* @dev The Ownable constructor sets the original `owner` of the contract to the sender | |
* account. | |
*/ | |
constructor() public { | |
owner = msg.sender; | |
} | |
/** | |
* @dev Throws if called by any account other than the owner. | |
*/ | |
modifier onlyOwner() { | |
require(msg.sender == owner); | |
_; | |
} | |
/** | |
* @dev Allows the current owner to transfer control of the contract to a newOwner. | |
* @param newOwner The address to transfer ownership to. | |
*/ | |
function transferOwnership(address newOwner) public onlyOwner { | |
require(newOwner != address(0)); | |
emit OwnershipTransferred(owner, newOwner); | |
owner = newOwner; | |
} | |
} | |
/** | |
* @title ERC827 interface, an extension of ERC20 token standard | |
* | |
* @dev Interface of a ERC827 token, following the ERC20 standard with extra | |
* @dev methods to transfer value and data and execute calls in transfers and | |
* @dev approvals. | |
*/ | |
contract ERC827 is ERC20 { | |
function approveAndCall( | |
address _spender, | |
uint256 _value, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool); | |
function transferAndCall( | |
address _to, | |
uint256 _value, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool); | |
function transferFromAndCall( | |
address _from, | |
address _to, | |
uint256 _value, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool); | |
} | |
/** | |
* @title SafeMath | |
* @dev Math operations with safety checks that throw on error | |
*/ | |
library SafeMath { | |
/** | |
* @dev Multiplies two numbers, throws on overflow. | |
*/ | |
function mul(uint256 a, uint256 b) internal pure returns (uint256 c) { | |
if (a == 0) { | |
return 0; | |
} | |
c = a * b; | |
assert(c / a == b); | |
return c; | |
} | |
/** | |
* @dev Integer division of two numbers, truncating the quotient. | |
*/ | |
function div(uint256 a, uint256 b) internal pure 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 a / b; | |
} | |
/** | |
* @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). | |
*/ | |
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
assert(b <= a); | |
return a - b; | |
} | |
/** | |
* @dev Adds two numbers, throws on overflow. | |
*/ | |
function add(uint256 a, uint256 b) internal pure returns (uint256 c) { | |
c = a + b; | |
assert(c >= a); | |
return c; | |
} | |
} | |
/** | |
* @title Standard ERC20 token | |
* | |
*/ | |
contract ERC20Token is ERC20{ | |
using SafeMath for uint256; | |
mapping (address => mapping (address => uint256)) internal allowed; | |
mapping(address => uint256) balances; | |
uint256 totalSupply_; | |
/** | |
* @dev total number of tokens in existence | |
*/ | |
function totalSupply() public view returns (uint256) { | |
return totalSupply_; | |
} | |
/** | |
* @dev transfer token for a specified address | |
* @param _to The address to transfer to. | |
* @param _value The amount to be transferred. | |
*/ | |
function transfer(address _to, uint256 _value) public returns (bool) { | |
require(_to != address(0)); | |
require(_value <= balances[msg.sender]); | |
balances[msg.sender] = balances[msg.sender].sub(_value); | |
balances[_to] = balances[_to].add(_value); | |
emit Transfer(msg.sender, _to, _value); | |
return true; | |
} | |
/** | |
* @dev Gets the balance of the specified address. | |
* @param _owner The address to query the the balance of. | |
* @return An uint256 representing the amount owned by the passed address. | |
*/ | |
function balanceOf(address _owner) public view returns (uint256) { | |
return balances[_owner]; | |
} | |
/** | |
* @dev Transfer tokens from one address to another | |
* @param _from address The address which you want to send tokens from | |
* @param _to address The address which you want to transfer to | |
* @param _value uint256 the amount of tokens to be transferred | |
*/ | |
function transferFrom( | |
address _from, | |
address _to, | |
uint256 _value | |
) | |
public | |
returns (bool) | |
{ | |
require(_to != address(0)); | |
require(_value <= balances[_from]); | |
require(_value <= allowed[_from][msg.sender]); | |
balances[_from] = balances[_from].sub(_value); | |
balances[_to] = balances[_to].add(_value); | |
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value); | |
emit Transfer(_from, _to, _value); | |
return true; | |
} | |
/** | |
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. | |
*/ | |
function approve(address _spender, uint256 _value) public returns (bool) { | |
allowed[msg.sender][_spender] = _value; | |
emit Approval(msg.sender, _spender, _value); | |
return true; | |
} | |
/** | |
* @dev Function to check the amount of tokens that an owner allowed to a spender. | |
* @param _owner address The address which owns the funds. | |
* @param _spender address The address which will spend the funds. | |
* @return A uint256 specifying the amount of tokens still available for the spender. | |
*/ | |
function allowance( | |
address _owner, | |
address _spender | |
) | |
public | |
view | |
returns (uint256) | |
{ | |
return allowed[_owner][_spender]; | |
} | |
/** | |
* @dev Increase the amount of tokens that an owner allowed to a spender. | |
* | |
* approve should be called when allowed[_spender] == 0. To increment | |
* allowed value is better to use this function to avoid 2 calls (and wait until | |
* the first transaction is mined) | |
* From MonolithDAO Token.sol | |
* @param _spender The address which will spend the funds. | |
* @param _addedValue The amount of tokens to increase the allowance by. | |
*/ | |
function increaseApproval( | |
address _spender, | |
uint _addedValue | |
) | |
public | |
returns (bool) | |
{ | |
allowed[msg.sender][_spender] = ( | |
allowed[msg.sender][_spender].add(_addedValue)); | |
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); | |
return true; | |
} | |
/** | |
* @dev Decrease the amount of tokens that an owner allowed to a spender. | |
* | |
* approve should be called when allowed[_spender] == 0. To decrement | |
* allowed value is better to use this function to avoid 2 calls (and wait until | |
* the first transaction is mined) | |
* From MonolithDAO Token.sol | |
* @param _spender The address which will spend the funds. | |
* @param _subtractedValue The amount of tokens to decrease the allowance by. | |
*/ | |
function decreaseApproval( | |
address _spender, | |
uint _subtractedValue | |
) | |
public | |
returns (bool) | |
{ | |
uint oldValue = allowed[msg.sender][_spender]; | |
if (_subtractedValue > oldValue) { | |
allowed[msg.sender][_spender] = 0; | |
} else { | |
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue); | |
} | |
emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); | |
return true; | |
} | |
} | |
/** | |
* @title ERC827, an extension of ERC20 token standard | |
* | |
* @dev Implementation the ERC827, following the ERC20 standard with extra | |
* @dev methods to transfer value and data and execute calls in transfers and | |
* @dev approvals. | |
* | |
* @dev Uses OpenZeppelin StandardToken. | |
*/ | |
contract ERC827Token is ERC827, ERC20Token { | |
/** | |
* @dev Addition to ERC20 token methods. It allows to | |
* @dev approve the transfer of value and execute a call with the sent data. | |
* | |
* @dev Beware that changing an allowance with this method brings the risk that | |
* @dev someone may use both the old and the new allowance by unfortunate | |
* @dev transaction ordering. One possible solution to mitigate this race condition | |
* @dev is to first reduce the spender's allowance to 0 and set the desired value | |
* @dev afterwards: | |
* @dev https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 | |
* | |
* @param _spender The address that will spend the funds. | |
* @param _value The amount of tokens to be spent. | |
* @param _data ABI-encoded contract call to call `_to` address. | |
* | |
* @return true if the call function was executed successfully | |
*/ | |
function approveAndCall( | |
address _spender, | |
uint256 _value, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool) | |
{ | |
require(_spender != address(this)); | |
super.approve(_spender, _value); | |
// solium-disable-next-line security/no-call-value | |
require(_spender.call.value(msg.value)(_data)); | |
return true; | |
} | |
/** | |
* @dev Addition to ERC20 token methods. Transfer tokens to a specified | |
* @dev address and execute a call with the sent data on the same transaction | |
* | |
* @param _to address The address which you want to transfer to | |
* @param _value uint256 the amout of tokens to be transfered | |
* @param _data ABI-encoded contract call to call `_to` address. | |
* | |
* @return true if the call function was executed successfully | |
*/ | |
function transferAndCall( | |
address _to, | |
uint256 _value, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool) | |
{ | |
require(_to != address(this)); | |
super.transfer(_to, _value); | |
require(_to.call.value(msg.value)(_data)); | |
return true; | |
} | |
/** | |
* @dev Addition to ERC20 token methods. Transfer tokens from one address to | |
* @dev another and make a contract call on the same transaction | |
* | |
* @param _from The address which you want to send tokens from | |
* @param _to The address which you want to transfer to | |
* @param _value The amout of tokens to be transferred | |
* @param _data ABI-encoded contract call to call `_to` address. | |
* | |
* @return true if the call function was executed successfully | |
*/ | |
function transferFromAndCall( | |
address _from, | |
address _to, | |
uint256 _value, | |
bytes _data | |
) | |
public payable returns (bool) | |
{ | |
require(_to != address(this)); | |
super.transferFrom(_from, _to, _value); | |
require(_to.call.value(msg.value)(_data)); | |
return true; | |
} | |
/** | |
* @dev Addition to StandardToken methods. Increase the amount of tokens that | |
* @dev an owner allowed to a spender and execute a call with the sent data. | |
* | |
* @dev approve should be called when allowed[_spender] == 0. To increment | |
* @dev allowed value is better to use this function to avoid 2 calls (and wait until | |
* @dev the first transaction is mined) | |
* @dev From MonolithDAO Token.sol | |
* | |
* @param _spender The address which will spend the funds. | |
* @param _addedValue The amount of tokens to increase the allowance by. | |
* @param _data ABI-encoded contract call to call `_spender` address. | |
*/ | |
function increaseApprovalAndCall( | |
address _spender, | |
uint _addedValue, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool) | |
{ | |
require(_spender != address(this)); | |
super.increaseApproval(_spender, _addedValue); | |
require(_spender.call.value(msg.value)(_data)); | |
return true; | |
} | |
/** | |
* @dev Addition to StandardToken methods. Decrease the amount of tokens that | |
* @dev an owner allowed to a spender and execute a call with the sent data. | |
* | |
* @dev approve should be called when allowed[_spender] == 0. To decrement | |
* @dev allowed value is better to use this function to avoid 2 calls (and wait until | |
* @dev the first transaction is mined) | |
* @dev From MonolithDAO Token.sol | |
* | |
* @param _spender The address which will spend the funds. | |
* @param _subtractedValue The amount of tokens to decrease the allowance by. | |
* @param _data ABI-encoded contract call to call `_spender` address. | |
*/ | |
function decreaseApprovalAndCall( | |
address _spender, | |
uint _subtractedValue, | |
bytes _data | |
) | |
public | |
payable | |
returns (bool) | |
{ | |
require(_spender != address(this)); | |
super.decreaseApproval(_spender, _subtractedValue); | |
require(_spender.call.value(msg.value)(_data)); | |
return true; | |
} | |
} | |
/** | |
* @title Burnable and Pause Token | |
* @dev StandardToken modified with pausable transfers. | |
**/ | |
contract PauseBurnableERC827Token is ERC827Token, Ownable{ | |
using SafeMath for uint256; | |
event Pause(); | |
event Unpause(); | |
event PauseOperatorTransferred(address indexed previousOperator,address indexed newOperator); | |
event Burn(address indexed burner, uint256 value); | |
bool public paused = false; | |
address public pauseOperator; | |
/** | |
* @dev Throws if called by any account other than the owner. | |
*/ | |
modifier onlyPauseOperator() { | |
require(msg.sender == pauseOperator || msg.sender == owner); | |
_; | |
} | |
/** | |
* @dev Modifier to make a function callable only when the contract is not paused. | |
*/ | |
modifier whenNotPaused() { | |
require(!paused); | |
_; | |
} | |
/** | |
* @dev Modifier to make a function callable only when the contract is paused. | |
*/ | |
modifier whenPaused() { | |
require(paused); | |
_; | |
} | |
/** | |
* @dev The constructor sets the original `owner` of the contract to the sender | |
* account. | |
*/ | |
constructor() public { | |
pauseOperator = msg.sender; | |
} | |
/** | |
* @dev called by the operator to set the new operator to pause the token | |
*/ | |
function transferPauseOperator(address newPauseOperator) onlyPauseOperator public { | |
require(newPauseOperator != address(0)); | |
emit PauseOperatorTransferred(pauseOperator, newPauseOperator); | |
pauseOperator = newPauseOperator; | |
} | |
/** | |
* @dev called by the owner to pause, triggers stopped state | |
*/ | |
function pause() onlyPauseOperator whenNotPaused public { | |
paused = true; | |
emit Pause(); | |
} | |
/** | |
* @dev called by the owner to unpause, returns to normal state | |
*/ | |
function unpause() onlyPauseOperator whenPaused public { | |
paused = false; | |
emit Unpause(); | |
} | |
function transfer(address _to,uint256 _value) | |
public | |
whenNotPaused | |
returns (bool) | |
{ | |
return super.transfer(_to, _value); | |
} | |
function transferFrom(address _from,address _to,uint256 _value) | |
public | |
whenNotPaused | |
returns (bool) | |
{ | |
return super.transferFrom(_from, _to, _value); | |
} | |
function approve(address _spender,uint256 _value) | |
public | |
whenNotPaused | |
returns (bool) | |
{ | |
return super.approve(_spender, _value); | |
} | |
function increaseApproval(address _spender,uint _addedValue) | |
public | |
whenNotPaused | |
returns (bool success) | |
{ | |
return super.increaseApproval(_spender, _addedValue); | |
} | |
function decreaseApproval(address _spender,uint _subtractedValue) | |
public | |
whenNotPaused | |
returns (bool success) | |
{ | |
return super.decreaseApproval(_spender, _subtractedValue); | |
} | |
/** | |
* @dev Burns a specific amount of tokens. | |
* @param _value The amount of token to be burned. | |
*/ | |
function burn(uint256 _value) | |
public whenNotPaused | |
{ | |
_burn(msg.sender, _value); | |
} | |
function _burn(address _who, uint256 _value) internal{ | |
require(_value <= balances[_who]); | |
// no need to require value <= totalSupply, since that would imply the | |
// sender's balance is greater than the totalSupply, which *should* be an assertion failure | |
balances[_who] = balances[_who].sub(_value); // Subtract from the sender | |
totalSupply_ = totalSupply_.sub(_value); | |
emit Burn(_who, _value); | |
emit Transfer(_who, address(0), _value); | |
} | |
/** | |
* @dev Burns a specific amount of tokens from the target address and decrements allowance | |
* @param _from address The address which you want to send tokens from | |
* @param _value uint256 The amount of token to be burned | |
*/ | |
function burnFrom(address _from, uint256 _value) | |
public whenNotPaused | |
{ | |
require(_value <= allowed[_from][msg.sender]); | |
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value); | |
_burn(_from, _value); | |
} | |
} | |
/** | |
* @title the Blockchain Quotations Token for BQI.COM | |
* | |
* @dev Uses OpenZeppelin Lib. | |
*/ | |
contract BQT is PauseBurnableERC827Token { | |
string public constant name = "BQT"; | |
string public constant symbol = "BQT"; | |
uint8 public constant decimals = 18; | |
uint256 public constant INITIAL_SUPPLY = 1000000000 * (10 ** uint256(decimals)); | |
/** | |
* @dev Constructor that gives msg.sender all of existing tokens. | |
*/ | |
constructor() public { | |
totalSupply_ = INITIAL_SUPPLY; | |
balances[msg.sender] = INITIAL_SUPPLY; | |
emit Transfer(0x0, msg.sender, INITIAL_SUPPLY); | |
} | |
} |
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