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Contract DisCas Vision (DISC)
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gistfile1.txt
/**
*Submitted for verification at BscScan.com on 2021-04-01
*/
/**
*Submitted for verification at BscScan.com on 2021-04-01
*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.4.26;
//pragma experimental ABIEncoderV2;
/**
* @title ERC20Basic
* @dev Simpler version of ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/179
*/
//contract ERC20Basic {
// function totalSupply() public view returns (uint256);
// function balanceOf(address who) public view returns (uint256);
// function transfer(address to, uint256 value) public returns (bool);
// event Transfer(address indexed from, address indexed to, uint256 value);
//}
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: 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
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
contract ERC20 is IERC20 {
bool public transferrable = false;
// function __enableTransfer() public onlyOwner {
// transferrable = true;
// }
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
);
}
/**
* @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) {
// Gas optimization: this is cheaper than asserting 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
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 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 OwnershipRenounced(address indexed previousOwner);
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 relinquish control of the contract.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(owner);
owner = address(0);
}
/**
* @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 {
_transferOwnership(_newOwner);
}
/**
* @dev Transfers control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function _transferOwnership(address _newOwner) internal {
require(_newOwner != address(0));
emit OwnershipTransferred(owner, _newOwner);
owner = _newOwner;
}
}
/**
* @title Basic token
* @dev Basic version of StandardToken, with no allowances.
*/
contract BasicToken is IERC20, Ownable {
using SafeMath for uint256;
mapping(address => uint256) balances;
uint256 totalSupply_;
bool transferrable = false;
// function __basicTokenTransferable() public onlyOwner{
// transferrable = true;
// }
function __AllowTokenTransfer() public onlyOwner{
transferrable = true;
}
/**
* @dev total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return totalSupply_;
}
function totalSupplyCheck() public 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(transferrable, "Token is not transferrable yet");
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];
}
}
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* @dev https://github.com/ethereum/EIPs/issues/20
* @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*/
contract StandardToken is ERC20, BasicToken {
mapping (address => mapping (address => uint256)) internal allowed;
/**
* @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(transferrable);
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
require(transferrable);
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.
*
* 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.
*/
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 Mintable token
* @dev Simple ERC20 Token example, with mintable token creation
* @dev Issue: * https://github.com/OpenZeppelin/openzeppelin-solidity/issues/120
* Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
*/
contract MintableToken is StandardToken {
//contract MintableToken is StandardToken, Ownable {
event Mint(address indexed to, uint256 amount);
event MintFinished();
bool __Finalized = false;
bool public mintingFinished = false;
modifier canMint() {
require(!mintingFinished);
_;
}
modifier hasMintPermission() {
require(msg.sender == owner);
_;
}
function __basicTokenTransferable() public onlyOwner {
transferrable = true;
}
function stop_mint() onlyOwner {
__Finalized = true;
}
/**
* @dev Function to mint tokens
* @param _to The address that will receive the minted tokens.
* @param _amount The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(
address _to,
uint256 _amount
)
hasMintPermission
canMint
public
returns (bool)
{
require (!__Finalized); // security measure preventing minting after finalization
totalSupply_ = totalSupply_.add(_amount);
balances[_to] = balances[_to].add(_amount);
emit Mint(_to, _amount);
emit Transfer(address(0), _to, _amount);
return true;
}
/**
* @dev Function to stop minting new tokens.
* @return True if the operation was successful.
*/
function finishMinting() onlyOwner canMint returns (bool) {
mintingFinished = true;
emit MintFinished();
return true;
}
}
contract FreezableToken is StandardToken {
// freezing chains
mapping (bytes32 => uint64) internal chains;
// freezing amounts for each chain
mapping (bytes32 => uint) internal freezings;
// total freezing balance per address
mapping (address => uint) internal freezingBalance;
event Freezed(address indexed to, uint64 release, uint amount);
event Released(address indexed owner, uint amount);
function toKey(address _addr, uint _release) internal pure returns (bytes32 result) {
// WISH masc to increase entropy
result = 0x5749534800000000000000000000000000000000000000000000000000000000;
assembly {
result := or(result, mul(_addr, 0x10000000000000000))
result := or(result, _release)
}
}
/**
* @dev gets freezing count
* @param _addr Address of freeze tokens owner.
*/
function freezingCount(address _addr) public view returns (uint count) {
uint64 release = chains[toKey(_addr, 0)];
while (release != 0) {
count++;
release = chains[toKey(_addr, release)];
}
}
/**
* @dev gets freezing end date and freezing balance for the freezing portion specified by index.
* @param _addr Address of freeze tokens owner.
* @param _index Freezing portion index. It ordered by release date descending.
*/
function getFreezing(address _addr, uint _index) public view returns (uint64 _release, uint _balance) {
for (uint i = 0; i < _index + 1; i++) {
_release = chains[toKey(_addr, _release)];
if (_release == 0) {
return;
}
}
_balance = freezings[toKey(_addr, _release)];
}
function releaseOnce() public {
bytes32 headKey = toKey(msg.sender, 0);
uint64 head = chains[headKey];
require(head != 0);
require(uint64(block.timestamp) > head);
bytes32 currentKey = toKey(msg.sender, head);
uint64 next = chains[currentKey];
uint amount = freezings[currentKey];
delete freezings[currentKey];
balances[msg.sender] = balances[msg.sender].add(amount);
freezingBalance[msg.sender] = freezingBalance[msg.sender].sub(amount);
if (next == 0) {
delete chains[headKey];
} else {
chains[headKey] = next;
delete chains[currentKey];
}
emit Released(msg.sender, amount);
}
/*
* @dev release all available for release freezing tokens. Gas usage is not deterministic!
* @return how many tokens was released
*/
function releaseAll() public returns (uint tokens) {
uint release;
uint balance;
(release, balance) = getFreezing(msg.sender, 0);
while (release != 0 && block.timestamp > release) {
releaseOnce();
tokens += balance;
(release, balance) = getFreezing(msg.sender, 0);
}
}
function freeze(address _to, uint64 _until) internal {
require(_until > block.timestamp);
bytes32 key = toKey(_to, _until);
bytes32 parentKey = toKey(_to, uint64(0));
uint64 next = chains[parentKey];
if (next == 0) {
chains[parentKey] = _until;
return;
}
bytes32 nextKey = toKey(_to, next);
uint parent;
while (next != 0 && _until > next) {
parent = next;
parentKey = nextKey;
next = chains[nextKey];
nextKey = toKey(_to, next);
}
if (_until == next) {
return;
}
if (next != 0) {
chains[key] = next;
}
chains[parentKey] = _until;
}
}
contract FreezableMintableToken is FreezableToken, MintableToken {
/**
* @dev Mint the specified amount of token to the specified address and freeze it until the specified date.
* Be careful, gas usage is not deterministic,
* and depends on how many freezes _to address already has.
* @param _to Address to which token will be freeze.
* @param _amount Amount of token to mint and freeze.
* @param _until Release date, must be in future.
* @return A boolean that indicates if the operation was successful.
*/
function mintAndFreeze(address _to, uint _amount, uint64 _until) public onlyOwner canMint returns (bool) {
totalSupply_ = totalSupply_.add(_amount);
bytes32 currentKey = toKey(_to, _until);
freezings[currentKey] = freezings[currentKey].add(_amount);
freezingBalance[_to] = freezingBalance[_to].add(_amount);
freeze(_to, _until);
emit Mint(_to, _amount);
emit Freezed(_to, _until, _amount);
emit Transfer(msg.sender, _to, _amount);
return true;
}
}
contract Consts {
uint constant TOKEN_DECIMALS = 18;
uint8 constant TOKEN_DECIMALS_UINT8 = 18;
uint constant TOKEN_DECIMAL_MULTIPLIER = 10 ** TOKEN_DECIMALS;
bool constant CONTINUE_MINTING = false;
}
contract MainToken is Consts, FreezableMintableToken
{
string public name;
string public symbol;
uint8 public decimals;
constructor (string memory _name, string memory _symbol) public {
name = _name;
symbol = _symbol;
decimals = 18;
}
function __name() public view returns (string) {
return name;
}
function __symbol() public view returns (string) {
return symbol;
}
function __decimals() public pure returns (uint8 _decimals) {
return TOKEN_DECIMALS_UINT8;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool _success) {
// require(!paused);
require(transferrable, "Token is not transferrable yet");
return super.transferFrom(_from, _to, _value);
}
function transfer(address _to, uint256 _value) public returns (bool _success) {
// require(!paused);
require(transferrable, "Token is not transferrable yet");
return super.transfer(_to, _value);
}
}
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