pragmasolidity ^0.5.0;/**
* Utility library of inline functions on addresses
*/libraryAddress{
/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param account address of the account to check
* @return whether the target address is a contract
*/functionisContract(address account) internalviewreturns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address// than to check the size of the code at that address.// See https://ethereum.stackexchange.com/a/14016/36603// for more details about how this works.// TODO Check this again before the Serenity release, because all addresses will be// contracts then.// solhint-disable-next-line no-inline-assemblyassembly { size :=extcodesize(account) }
return size >0;
}
}
Contract Source Code
File 2 of 13: ERC20.sol
pragmasolidity ^0.5.0;import"./IERC20.sol";
import"./SafeMath.sol";
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* https://eips.ethereum.org/EIPS/eip-20
* Originally based on code by FirstBlood:
* https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*
* This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
* all accounts just by listening to said events. Note that this isn't required by the specification, and other
* compliant implementations may not do it.
*/contractERC20isIERC20{
usingSafeMathforuint256;
mapping (address=>uint256) private _balances;
mapping (address=>mapping (address=>uint256)) private _allowed;
uint256private _totalSupply;
/**
* @dev Total number of tokens in existence.
*/functiontotalSupply() publicviewreturns (uint256) {
return _totalSupply;
}
/**
* @dev Gets the balance of the specified address.
* @param owner The address to query the balance of.
* @return A uint256 representing the amount owned by the passed address.
*/functionbalanceOf(address owner) publicviewreturns (uint256) {
return _balances[owner];
}
/**
* @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.
*/functionallowance(address owner, address spender) publicviewreturns (uint256) {
return _allowed[owner][spender];
}
/**
* @dev Transfer token to a specified address.
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/functiontransfer(address to, uint256 value) publicreturns (bool) {
_transfer(msg.sender, to, value);
returntrue;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
*/functionapprove(address spender, uint256 value) publicreturns (bool) {
_approve(msg.sender, spender, value);
returntrue;
}
/**
* @dev Transfer tokens from one address to another.
* Note that while this function emits an Approval event, this is not required as per the specification,
* and other compliant implementations may not emit the event.
* @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
*/functiontransferFrom(addressfrom, address to, uint256 value) publicreturns (bool) {
_transfer(from, to, value);
_approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
returntrue;
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
* approve should be called when _allowed[msg.sender][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
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param addedValue The amount of tokens to increase the allowance by.
*/functionincreaseAllowance(address spender, uint256 addedValue) publicreturns (bool) {
_approve(msg.sender, spender, _allowed[msg.sender][spender].add(addedValue));
returntrue;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
* approve should be called when _allowed[msg.sender][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
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param subtractedValue The amount of tokens to decrease the allowance by.
*/functiondecreaseAllowance(address spender, uint256 subtractedValue) publicreturns (bool) {
_approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));
returntrue;
}
/**
* @dev Transfer token for a specified addresses.
* @param from The address to transfer from.
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/function_transfer(addressfrom, address to, uint256 value) internal{
require(to !=address(0));
_balances[from] = _balances[from].sub(value);
_balances[to] = _balances[to].add(value);
emit Transfer(from, to, value);
}
/**
* @dev Internal function that mints an amount of the token and assigns it to
* an account. This encapsulates the modification of balances such that the
* proper events are emitted.
* @param account The account that will receive the created tokens.
* @param value The amount that will be created.
*/function_mint(address account, uint256 value) internal{
require(account !=address(0));
_totalSupply = _totalSupply.add(value);
_balances[account] = _balances[account].add(value);
emit Transfer(address(0), account, value);
}
/**
* @dev Internal function that burns an amount of the token of a given
* account.
* @param account The account whose tokens will be burnt.
* @param value The amount that will be burnt.
*/function_burn(address account, uint256 value) internal{
require(account !=address(0));
_totalSupply = _totalSupply.sub(value);
_balances[account] = _balances[account].sub(value);
emit Transfer(account, address(0), value);
}
/**
* @dev Approve an address to spend another addresses' tokens.
* @param owner The address that owns the tokens.
* @param spender The address that will spend the tokens.
* @param value The number of tokens that can be spent.
*/function_approve(address owner, address spender, uint256 value) internal{
require(spender !=address(0));
require(owner !=address(0));
_allowed[owner][spender] = value;
emit Approval(owner, spender, value);
}
}
Contract Source Code
File 3 of 13: ERC20Capped.sol
pragmasolidity ^0.5.0;import"./ERC20Mintable.sol";
/**
* @title Capped token
* @dev Mintable token with a token cap.
*/contractERC20CappedisERC20Mintable{
uint256private _cap;
constructor (uint256 cap) public{
require(cap >0);
_cap = cap;
}
/**
* @return the cap for the token minting.
*/functioncap() publicviewreturns (uint256) {
return _cap;
}
function_mint(address account, uint256 value) internal{
require(totalSupply().add(value) <= _cap);
super._mint(account, value);
}
}
Contract Source Code
File 4 of 13: ERC20Detailed.sol
pragmasolidity ^0.5.0;import"./IERC20.sol";
/**
* @title ERC20Detailed token
* @dev The decimals are only for visualization purposes.
* All the operations are done using the smallest and indivisible token unit,
* just as on Ethereum all the operations are done in wei.
*/contractERC20DetailedisIERC20{
stringprivate _name;
stringprivate _symbol;
uint8private _decimals;
constructor (stringmemory name, stringmemory symbol, uint8 decimals) public{
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @return the name of the token.
*/functionname() publicviewreturns (stringmemory) {
return _name;
}
/**
* @return the symbol of the token.
*/functionsymbol() publicviewreturns (stringmemory) {
return _symbol;
}
/**
* @return the number of decimals of the token.
*/functiondecimals() publicviewreturns (uint8) {
return _decimals;
}
}
Contract Source Code
File 5 of 13: ERC20Mintable.sol
pragmasolidity ^0.5.0;import"./ERC20.sol";
import"./MinterRole.sol";
import"./Pausable.sol";
/**
* @title ERC20Mintable
* @dev ERC20 minting logic.
*/contractERC20MintableisERC20, MinterRole, Pausable{
/**
* @dev Function to mint tokens
* @param to The address that will receive the minted tokens.
* @param value The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/functionmint(address to, uint256 value) publiconlyMinterwhenNotPausedreturns (bool) {
_mint(to, value);
returntrue;
}
}
pragmasolidity ^0.5.0;import"./PauserRole.sol";
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/contractPausableisPauserRole{
eventPaused(address account);
eventUnpaused(address account);
boolprivate _paused;
constructor () internal{
_paused =false;
}
/**
* @return True if the contract is paused, false otherwise.
*/functionpaused() publicviewreturns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/modifierwhenNotPaused() {
require(!_paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/modifierwhenPaused() {
require(_paused);
_;
}
/**
* @dev Called by a pauser to pause, triggers stopped state.
*/functionpause() publiconlyPauserwhenNotPaused{
_paused =true;
emit Paused(msg.sender);
}
/**
* @dev Called by a pauser to unpause, returns to normal state.
*/functionunpause() publiconlyPauserwhenPaused{
_paused =false;
emit Unpaused(msg.sender);
}
}
pragmasolidity ^0.5.0;/**
* @title Roles
* @dev Library for managing addresses assigned to a Role.
*/libraryRoles{
structRole {
mapping (address=>bool) bearer;
}
/**
* @dev Give an account access to this role.
*/functionadd(Role storage role, address account) internal{
require(account !=address(0));
require(!has(role, account));
role.bearer[account] =true;
}
/**
* @dev Remove an account's access to this role.
*/functionremove(Role storage role, address account) internal{
require(account !=address(0));
require(has(role, account));
role.bearer[account] =false;
}
/**
* @dev Check if an account has this role.
* @return bool
*/functionhas(Role storage role, address account) internalviewreturns (bool) {
require(account !=address(0));
return role.bearer[account];
}
}
Contract Source Code
File 13 of 13: SafeMath.sol
pragmasolidity ^0.5.0;/**
* @title SafeMath
* @dev Unsigned math operations with safety checks that revert on error.
*/librarySafeMath{
/**
* @dev Multiplies two unsigned integers, reverts on overflow.
*/functionmul(uint256 a, uint256 b) internalpurereturns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the// benefit is lost if 'b' is also tested.// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522if (a ==0) {
return0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
*/functiondiv(uint256 a, uint256 b) internalpurereturns (uint256) {
// Solidity only automatically asserts when dividing by 0require(b >0);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't holdreturn c;
}
/**
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/functionsub(uint256 a, uint256 b) internalpurereturns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two unsigned integers, reverts on overflow.
*/functionadd(uint256 a, uint256 b) internalpurereturns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/functionmod(uint256 a, uint256 b) internalpurereturns (uint256) {
require(b !=0);
return a % b;
}
}