Contract Source Code:
File 1 of 1 : SeedSwap
// File: @openzeppelin/contracts/GSN/Context.sol
pragma solidity ^0.5.0;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () internal { }
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
// File: @openzeppelin/contracts/ownership/Ownable.sol
pragma solidity ^0.5.0;
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor () internal {
address msgSender = _msgSender();
_owner = msgSender;
emit OwnershipTransferred(address(0), msgSender);
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Returns true if the caller is the current owner.
*/
function isOwner() public view returns (bool) {
return _msgSender() == _owner;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// File: @openzeppelin/contracts/access/Roles.sol
pragma solidity ^0.5.0;
/**
* @title Roles
* @dev Library for managing addresses assigned to a Role.
*/
library Roles {
struct Role {
mapping (address => bool) bearer;
}
/**
* @dev Give an account access to this role.
*/
function add(Role storage role, address account) internal {
require(!has(role, account), "Roles: account already has role");
role.bearer[account] = true;
}
/**
* @dev Remove an account's access to this role.
*/
function remove(Role storage role, address account) internal {
require(has(role, account), "Roles: account does not have role");
role.bearer[account] = false;
}
/**
* @dev Check if an account has this role.
* @return bool
*/
function has(Role storage role, address account) internal view returns (bool) {
require(account != address(0), "Roles: account is the zero address");
return role.bearer[account];
}
}
// File: @openzeppelin/contracts/access/roles/WhitelistAdminRole.sol
pragma solidity ^0.5.0;
/**
* @title WhitelistAdminRole
* @dev WhitelistAdmins are responsible for assigning and removing Whitelisted accounts.
*/
contract WhitelistAdminRole is Context {
using Roles for Roles.Role;
event WhitelistAdminAdded(address indexed account);
event WhitelistAdminRemoved(address indexed account);
Roles.Role private _whitelistAdmins;
constructor () internal {
_addWhitelistAdmin(_msgSender());
}
modifier onlyWhitelistAdmin() {
require(isWhitelistAdmin(_msgSender()), "WhitelistAdminRole: caller does not have the WhitelistAdmin role");
_;
}
function isWhitelistAdmin(address account) public view returns (bool) {
return _whitelistAdmins.has(account);
}
function addWhitelistAdmin(address account) public onlyWhitelistAdmin {
_addWhitelistAdmin(account);
}
function renounceWhitelistAdmin() public {
_removeWhitelistAdmin(_msgSender());
}
function _addWhitelistAdmin(address account) internal {
_whitelistAdmins.add(account);
emit WhitelistAdminAdded(account);
}
function _removeWhitelistAdmin(address account) internal {
_whitelistAdmins.remove(account);
emit WhitelistAdminRemoved(account);
}
}
// File: @openzeppelin/contracts/access/roles/WhitelistedRole.sol
pragma solidity ^0.5.0;
/**
* @title WhitelistedRole
* @dev Whitelisted accounts have been approved by a WhitelistAdmin to perform certain actions (e.g. participate in a
* crowdsale). This role is special in that the only accounts that can add it are WhitelistAdmins (who can also remove
* it), and not Whitelisteds themselves.
*/
contract WhitelistedRole is Context, WhitelistAdminRole {
using Roles for Roles.Role;
event WhitelistedAdded(address indexed account);
event WhitelistedRemoved(address indexed account);
Roles.Role private _whitelisteds;
modifier onlyWhitelisted() {
require(isWhitelisted(_msgSender()), "WhitelistedRole: caller does not have the Whitelisted role");
_;
}
function isWhitelisted(address account) public view returns (bool) {
return _whitelisteds.has(account);
}
function addWhitelisted(address account) public onlyWhitelistAdmin {
_addWhitelisted(account);
}
function removeWhitelisted(address account) public onlyWhitelistAdmin {
_removeWhitelisted(account);
}
function renounceWhitelisted() public {
_removeWhitelisted(_msgSender());
}
function _addWhitelisted(address account) internal {
_whitelisteds.add(account);
emit WhitelistedAdded(account);
}
function _removeWhitelisted(address account) internal {
_whitelisteds.remove(account);
emit WhitelistedRemoved(account);
}
}
// File: contracts/whitelist/WhitelistExtension.sol
pragma solidity 0.5.11;
/// @dev Extension of WhitelistedRole to allow add multiple whitelisted admins or accounts
/// in a single transaction
/// also added Pausable
contract WhitelistExtension is Ownable, WhitelistedRole {
event Paused(address account);
event Unpaused(address account);
bool private _paused;
modifier whenNotPaused() {
require(!_paused, "paused");
_;
}
modifier whenPaused() {
require(_paused, "not paused");
_;
}
constructor() public {
_paused = false;
}
function pause() public onlyWhitelistAdmin whenNotPaused {
_paused = true;
emit Paused(msg.sender);
}
function unpause() public onlyWhitelistAdmin whenPaused {
_paused = false;
emit Unpaused(msg.sender);
}
/// @dev update whitelisted admins
/// only owner can update this list
function updateWhitelistedAdmins(
address[] calldata admins,
bool isAdd
)
external onlyOwner
{
for(uint256 i = 0; i < admins.length; i++) {
if (isAdd) {
if (!isWhitelistAdmin(admins[i])) _addWhitelistAdmin(admins[i]);
} else {
if (isWhitelistAdmin(admins[i])) _removeWhitelistAdmin(admins[i]);
}
}
}
/// @dev update whitelisted addresses
/// only whitelisted admins can call this function
function updateWhitelistedUsers(
address[] calldata users,
bool isAdd
)
external onlyWhitelistAdmin
{
for(uint256 i = 0; i < users.length; i++) {
if (isAdd) {
if (!isWhitelisted(users[i])) _addWhitelisted(users[i]);
} else {
if (isWhitelisted(users[i])) _removeWhitelisted(users[i]);
}
}
}
function isPaused() external view returns (bool) {
return _paused;
}
}
// File: @openzeppelin/contracts/token/ERC20/IERC20.sol
pragma solidity ^0.5.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
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);
}
// File: @openzeppelin/contracts/math/SafeMath.sol
pragma solidity ^0.5.0;
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (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-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: @openzeppelin/contracts/utils/Address.sol
pragma solidity ^0.5.5;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// According to EIP-1052, 0x0 is the value returned for not-yet created accounts
// and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
// for accounts without code, i.e. `keccak256('')`
bytes32 codehash;
bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
// solhint-disable-next-line no-inline-assembly
assembly { codehash := extcodehash(account) }
return (codehash != accountHash && codehash != 0x0);
}
/**
* @dev Converts an `address` into `address payable`. Note that this is
* simply a type cast: the actual underlying value is not changed.
*
* _Available since v2.4.0._
*/
function toPayable(address account) internal pure returns (address payable) {
return address(uint160(account));
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*
* _Available since v2.4.0._
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-call-value
(bool success, ) = recipient.call.value(amount)("");
require(success, "Address: unable to send value, recipient may have reverted");
}
}
// File: @openzeppelin/contracts/token/ERC20/SafeERC20.sol
pragma solidity ^0.5.0;
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
using SafeMath for uint256;
using Address for address;
function safeTransfer(IERC20 token, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
function safeApprove(IERC20 token, address spender, uint256 value) internal {
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero. To increase and decrease it, use
// 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
// solhint-disable-next-line max-line-length
require((value == 0) || (token.allowance(address(this), spender) == 0),
"SafeERC20: approve from non-zero to non-zero allowance"
);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
}
function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).add(value);
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
* @param token The token targeted by the call.
* @param data The call data (encoded using abi.encode or one of its variants).
*/
function callOptionalReturn(IERC20 token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves.
// A Solidity high level call has three parts:
// 1. The target address is checked to verify it contains contract code
// 2. The call itself is made, and success asserted
// 3. The return value is decoded, which in turn checks the size of the returned data.
// solhint-disable-next-line max-line-length
require(address(token).isContract(), "SafeERC20: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = address(token).call(data);
require(success, "SafeERC20: low-level call failed");
if (returndata.length > 0) { // Return data is optional
// solhint-disable-next-line max-line-length
require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
}
}
}
// File: @openzeppelin/contracts/utils/ReentrancyGuard.sol
pragma solidity ^0.5.0;
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*
* _Since v2.5.0:_ this module is now much more gas efficient, given net gas
* metering changes introduced in the Istanbul hardfork.
*/
contract ReentrancyGuard {
bool private _notEntered;
constructor () internal {
// Storing an initial non-zero value makes deployment a bit more
// expensive, but in exchange the refund on every call to nonReentrant
// will be lower in amount. Since refunds are capped to a percetange of
// the total transaction's gas, it is best to keep them low in cases
// like this one, to increase the likelihood of the full refund coming
// into effect.
_notEntered = true;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
// On the first call to nonReentrant, _notEntered will be true
require(_notEntered, "ReentrancyGuard: reentrant call");
// Any calls to nonReentrant after this point will fail
_notEntered = false;
_;
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_notEntered = true;
}
}
// File: @openzeppelin/contracts/crowdsale/Crowdsale.sol
pragma solidity ^0.5.0;
/**
* @title Crowdsale
* @dev Crowdsale is a base contract for managing a token crowdsale,
* allowing investors to purchase tokens with ether. This contract implements
* such functionality in its most fundamental form and can be extended to provide additional
* functionality and/or custom behavior.
* The external interface represents the basic interface for purchasing tokens, and conforms
* the base architecture for crowdsales. It is *not* intended to be modified / overridden.
* The internal interface conforms the extensible and modifiable surface of crowdsales. Override
* the methods to add functionality. Consider using 'super' where appropriate to concatenate
* behavior.
*/
contract Crowdsale is Context, ReentrancyGuard {
using SafeMath for uint256;
using SafeERC20 for IERC20;
// The token being sold
IERC20 private _token;
// Address where funds are collected
address payable private _wallet;
// How many token units a buyer gets per wei.
// The rate is the conversion between wei and the smallest and indivisible token unit.
// So, if you are using a rate of 1 with a ERC20Detailed token with 3 decimals called TOK
// 1 wei will give you 1 unit, or 0.001 TOK.
uint256 private _rate;
// Amount of wei raised
uint256 private _weiRaised;
/**
* Event for token purchase logging
* @param purchaser who paid for the tokens
* @param beneficiary who got the tokens
* @param value weis paid for purchase
* @param amount amount of tokens purchased
*/
event TokensPurchased(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);
/**
* @param rate Number of token units a buyer gets per wei
* @dev The rate is the conversion between wei and the smallest and indivisible
* token unit. So, if you are using a rate of 1 with a ERC20Detailed token
* with 3 decimals called TOK, 1 wei will give you 1 unit, or 0.001 TOK.
* @param wallet Address where collected funds will be forwarded to
* @param token Address of the token being sold
*/
constructor (uint256 rate, address payable wallet, IERC20 token) public {
require(rate > 0, "Crowdsale: rate is 0");
require(wallet != address(0), "Crowdsale: wallet is the zero address");
require(address(token) != address(0), "Crowdsale: token is the zero address");
_rate = rate;
_wallet = wallet;
_token = token;
}
/**
* @dev fallback function ***DO NOT OVERRIDE***
* Note that other contracts will transfer funds with a base gas stipend
* of 2300, which is not enough to call buyTokens. Consider calling
* buyTokens directly when purchasing tokens from a contract.
*/
function () external payable {
buyTokens(_msgSender());
}
/**
* @return the token being sold.
*/
function token() public view returns (IERC20) {
return _token;
}
/**
* @return the address where funds are collected.
*/
function wallet() public view returns (address payable) {
return _wallet;
}
/**
* @return the number of token units a buyer gets per wei.
*/
function rate() public view returns (uint256) {
return _rate;
}
/**
* @return the amount of wei raised.
*/
function weiRaised() public view returns (uint256) {
return _weiRaised;
}
/**
* @dev low level token purchase ***DO NOT OVERRIDE***
* This function has a non-reentrancy guard, so it shouldn't be called by
* another `nonReentrant` function.
* @param beneficiary Recipient of the token purchase
*/
function buyTokens(address beneficiary) public nonReentrant payable {
uint256 weiAmount = msg.value;
_preValidatePurchase(beneficiary, weiAmount);
// calculate token amount to be created
uint256 tokens = _getTokenAmount(weiAmount);
// update state
_weiRaised = _weiRaised.add(weiAmount);
_processPurchase(beneficiary, tokens);
emit TokensPurchased(_msgSender(), beneficiary, weiAmount, tokens);
_updatePurchasingState(beneficiary, weiAmount);
_forwardFunds();
_postValidatePurchase(beneficiary, weiAmount);
}
/**
* @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met.
* Use `super` in contracts that inherit from Crowdsale to extend their validations.
* Example from CappedCrowdsale.sol's _preValidatePurchase method:
* super._preValidatePurchase(beneficiary, weiAmount);
* require(weiRaised().add(weiAmount) <= cap);
* @param beneficiary Address performing the token purchase
* @param weiAmount Value in wei involved in the purchase
*/
function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view {
require(beneficiary != address(0), "Crowdsale: beneficiary is the zero address");
require(weiAmount != 0, "Crowdsale: weiAmount is 0");
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
}
/**
* @dev Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid
* conditions are not met.
* @param beneficiary Address performing the token purchase
* @param weiAmount Value in wei involved in the purchase
*/
function _postValidatePurchase(address beneficiary, uint256 weiAmount) internal view {
// solhint-disable-previous-line no-empty-blocks
}
/**
* @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends
* its tokens.
* @param beneficiary Address performing the token purchase
* @param tokenAmount Number of tokens to be emitted
*/
function _deliverTokens(address beneficiary, uint256 tokenAmount) internal {
_token.safeTransfer(beneficiary, tokenAmount);
}
/**
* @dev Executed when a purchase has been validated and is ready to be executed. Doesn't necessarily emit/send
* tokens.
* @param beneficiary Address receiving the tokens
* @param tokenAmount Number of tokens to be purchased
*/
function _processPurchase(address beneficiary, uint256 tokenAmount) internal {
_deliverTokens(beneficiary, tokenAmount);
}
/**
* @dev Override for extensions that require an internal state to check for validity (current user contributions,
* etc.)
* @param beneficiary Address receiving the tokens
* @param weiAmount Value in wei involved in the purchase
*/
function _updatePurchasingState(address beneficiary, uint256 weiAmount) internal {
// solhint-disable-previous-line no-empty-blocks
}
/**
* @dev Override to extend the way in which ether is converted to tokens.
* @param weiAmount Value in wei to be converted into tokens
* @return Number of tokens that can be purchased with the specified _weiAmount
*/
function _getTokenAmount(uint256 weiAmount) internal view returns (uint256) {
return weiAmount.mul(_rate);
}
/**
* @dev Determines how ETH is stored/forwarded on purchases.
*/
function _forwardFunds() internal {
_wallet.transfer(msg.value);
}
}
// File: @openzeppelin/contracts/crowdsale/validation/TimedCrowdsale.sol
pragma solidity ^0.5.0;
/**
* @title TimedCrowdsale
* @dev Crowdsale accepting contributions only within a time frame.
*/
contract TimedCrowdsale is Crowdsale {
using SafeMath for uint256;
uint256 private _openingTime;
uint256 private _closingTime;
/**
* Event for crowdsale extending
* @param newClosingTime new closing time
* @param prevClosingTime old closing time
*/
event TimedCrowdsaleExtended(uint256 prevClosingTime, uint256 newClosingTime);
/**
* @dev Reverts if not in crowdsale time range.
*/
modifier onlyWhileOpen {
require(isOpen(), "TimedCrowdsale: not open");
_;
}
/**
* @dev Constructor, takes crowdsale opening and closing times.
* @param openingTime Crowdsale opening time
* @param closingTime Crowdsale closing time
*/
constructor (uint256 openingTime, uint256 closingTime) public {
// solhint-disable-next-line not-rely-on-time
require(openingTime >= block.timestamp, "TimedCrowdsale: opening time is before current time");
// solhint-disable-next-line max-line-length
require(closingTime > openingTime, "TimedCrowdsale: opening time is not before closing time");
_openingTime = openingTime;
_closingTime = closingTime;
}
/**
* @return the crowdsale opening time.
*/
function openingTime() public view returns (uint256) {
return _openingTime;
}
/**
* @return the crowdsale closing time.
*/
function closingTime() public view returns (uint256) {
return _closingTime;
}
/**
* @return true if the crowdsale is open, false otherwise.
*/
function isOpen() public view returns (bool) {
// solhint-disable-next-line not-rely-on-time
return block.timestamp >= _openingTime && block.timestamp <= _closingTime;
}
/**
* @dev Checks whether the period in which the crowdsale is open has already elapsed.
* @return Whether crowdsale period has elapsed
*/
function hasClosed() public view returns (bool) {
// solhint-disable-next-line not-rely-on-time
return block.timestamp > _closingTime;
}
/**
* @dev Extend parent behavior requiring to be within contributing period.
* @param beneficiary Token purchaser
* @param weiAmount Amount of wei contributed
*/
function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal onlyWhileOpen view {
super._preValidatePurchase(beneficiary, weiAmount);
}
/**
* @dev Extend crowdsale.
* @param newClosingTime Crowdsale closing time
*/
function _extendTime(uint256 newClosingTime) internal {
require(!hasClosed(), "TimedCrowdsale: already closed");
// solhint-disable-next-line max-line-length
require(newClosingTime > _closingTime, "TimedCrowdsale: new closing time is before current closing time");
emit TimedCrowdsaleExtended(_closingTime, newClosingTime);
_closingTime = newClosingTime;
}
}
// File: @openzeppelin/contracts/crowdsale/distribution/FinalizableCrowdsale.sol
pragma solidity ^0.5.0;
/**
* @title FinalizableCrowdsale
* @dev Extension of TimedCrowdsale with a one-off finalization action, where one
* can do extra work after finishing.
*/
contract FinalizableCrowdsale is TimedCrowdsale {
using SafeMath for uint256;
bool private _finalized;
event CrowdsaleFinalized();
constructor () internal {
_finalized = false;
}
/**
* @return true if the crowdsale is finalized, false otherwise.
*/
function finalized() public view returns (bool) {
return _finalized;
}
/**
* @dev Must be called after crowdsale ends, to do some extra finalization
* work. Calls the contract's finalization function.
*/
function finalize() public {
require(!_finalized, "FinalizableCrowdsale: already finalized");
require(hasClosed(), "FinalizableCrowdsale: not closed");
_finalized = true;
_finalization();
emit CrowdsaleFinalized();
}
/**
* @dev Can be overridden to add finalization logic. The overriding function
* should call super._finalization() to ensure the chain of finalization is
* executed entirely.
*/
function _finalization() internal {
// solhint-disable-previous-line no-empty-blocks
}
}
// File: contracts/SeedSwap.sol
pragma solidity 0.5.11;
/// @dev SeedSwap contract for presale TEA token
/// Some notations:
/// dAmount - distributed token amount
/// uAmount - undistributed token amount
/// tAmount - token amount
/// eAmount - eth amount
contract SeedSwap is WhitelistExtension, ReentrancyGuard {
using SafeERC20 for IERC20;
using SafeMath for uint256;
using SafeMath for uint80;
IERC20 public constant ETH_ADDRESS = IERC20(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
uint256 public constant MAX_UINT_80 = 2**79 - 1;
uint256 public constant HARD_CAP = 320 ether;
uint256 public constant MIN_INDIVIDUAL_CAP = 1 ether;
uint256 public constant MAX_INDIVIDUAL_CAP = 10 ether;
// user can call to distribute tokens after WITHDRAWAL_DEADLINE + saleEndTime
uint256 public constant WITHDRAWAL_DEADLINE = 180 days;
uint256 public constant SAFE_DISTRIBUTE_NUMBER = 150; // safe to distribute to 150 users at once
uint256 public constant DISTRIBUTE_PERIOD_UNIT = 1 days;
IERC20 public saleToken;
uint256 public saleStartTime = 1609693200; // 00:00:00, 4 Jan 2021 GMT+7
uint256 public saleEndTime = 1610384340; // 23:59:00, 11 Jan 2021 GMT+7
uint256 public saleRate = 25000; // 1 eth = 25,000 token
// address to receive eth of presale, default owner
address payable public ethRecipient;
// total eth and token amounts that all users have swapped
struct TotalSwappedData {
uint128 eAmount;
uint128 tAmount;
}
TotalSwappedData public totalData;
uint256 public totalDistributedToken = 0;
struct SwapData {
address user;
uint80 eAmount; // eth amount
uint80 tAmount; // token amount
uint80 dAmount; // distributed token amount
uint16 daysID;
}
// all swaps that are made by users
SwapData[] public listSwaps;
// list indices of user's swaps in listSwaps array
mapping(address => uint256[]) public userSwapData;
mapping(address => address) public userTokenRecipient;
event SwappedEthToTea(
address indexed trader,
uint256 indexed ethAmount,
uint256 indexed teaAmount,
uint256 blockTimestamp,
uint16 daysID
);
event UpdateSaleTimes(
uint256 indexed newStartTime,
uint256 newEndTime
);
event UpdateSaleRate(uint256 indexed newSaleRate);
event UpdateEthRecipient(address indexed newRecipient);
event Distributed(
address indexed user,
address indexed recipient,
uint256 dAmount,
uint256 indexed percentage,
uint256 timestamp
);
event SelfWithdrawToken(
address indexed sender,
address indexed recipient,
uint256 indexed dAmount,
uint256 timestamp
);
event EmergencyOwnerWithdraw(
address indexed sender,
IERC20 indexed token,
uint256 amount
);
event UpdatedTokenRecipient(
address user,
address recipient
);
modifier whenNotStarted() {
require(block.timestamp < saleStartTime, "already started");
_;
}
modifier whenNotEnded() {
require(block.timestamp <= saleEndTime, "already ended");
_;
}
modifier whenEnded() {
require(block.timestamp > saleEndTime, "not ended yet");
_;
}
modifier onlyValidPercentage(uint256 percentage) {
require(0 < percentage && percentage <= 100, "percentage out of range");
_;
}
/// @dev Conditions:
/// 1. sale must be in progress
/// 2. hard cap is not reached yet
/// 3. user's total swapped eth amount is within individual caps
/// 4. user is whitelisted
/// 5. if total eth amount after the swap is higher than hard cap, still allow
/// Note: _paused is checked independently.
modifier onlyCanSwap(uint256 ethAmount) {
require(ethAmount > 0, "onlyCanSwap: amount is 0");
// check sale is in progress
uint256 timestamp = block.timestamp;
require(timestamp >= saleStartTime, "onlyCanSwap: not started yet");
require(timestamp <= saleEndTime, "onlyCanSwap: already ended");
// check hardcap is not reached
require(totalData.eAmount < HARD_CAP, "onlyCanSwap: HARD_CAP reached");
address sender = msg.sender;
// check whitelisted
require(isWhitelisted(sender), "onlyCanSwap: sender is not whitelisted");
// check total user's swap eth amount is within individual cap
(uint80 userEthAmount, ,) = _getUserSwappedAmount(sender);
uint256 totalEthAmount = ethAmount.add(uint256(userEthAmount));
require(
totalEthAmount >= MIN_INDIVIDUAL_CAP,
"onlyCanSwap: eth amount is lower than min individual cap"
);
require(
totalEthAmount <= MAX_INDIVIDUAL_CAP,
"onlyCapSwap: max individual cap reached"
);
_;
}
constructor(address payable _owner, IERC20 _token) public {
require(_token != IERC20(0), "constructor: invalid token");
// (safe) check timestamp
// assert(block.timestamp < saleStartTime);
assert(saleStartTime < saleEndTime);
saleToken = _token;
ethRecipient = _owner;
// add owner as whitelisted admin and transfer ownership if needed
if (msg.sender != _owner) {
_addWhitelistAdmin(_owner);
transferOwnership(_owner);
}
}
function () external payable {
swapEthToToken();
}
/// ================ UPDATE DEFAULT DATA ====================
/// @dev the owner can update start and end times when it is not yet started
function updateSaleTimes(uint256 _newStartTime, uint256 _newEndTime)
external whenNotStarted onlyOwner
{
if (_newStartTime != 0) saleStartTime = _newStartTime;
if (_newEndTime != 0) saleEndTime = _newEndTime;
require(saleStartTime < saleEndTime, "Times: invalid start and end time");
require(block.timestamp < saleStartTime, "Times: invalid start time");
emit UpdateSaleTimes(saleStartTime, saleEndTime);
}
/// @dev the owner can update the sale rate whenever the sale is not ended yet
function updateSaleRate(uint256 _newsaleRate)
external whenNotEnded onlyOwner
{
require(
_newsaleRate < MAX_UINT_80 / MAX_INDIVIDUAL_CAP,
"Rates: new rate is out of range"
);
// safe check rate not different more than 50% than the current rate
require(_newsaleRate >= saleRate / 2, "Rates: new rate too low");
require(_newsaleRate <= saleRate * 3 / 2, "Rates: new rate too high");
saleRate = _newsaleRate;
emit UpdateSaleRate(_newsaleRate);
}
/// @dev the owner can update the recipient of eth any time
function updateEthRecipientAddress(address payable _newRecipient)
external onlyOwner
{
require(_newRecipient != address(0), "Receipient: invalid eth recipient address");
ethRecipient = _newRecipient;
emit UpdateEthRecipient(_newRecipient);
}
/// ================ SWAP ETH TO TEA TOKEN ====================
/// @dev user can call this function to swap eth to TEA token
/// or just deposit eth directly to the contract
function swapEthToToken()
public payable
nonReentrant
whenNotPaused
onlyCanSwap(msg.value)
returns (uint256 tokenAmount)
{
address sender = msg.sender;
uint256 ethAmount = msg.value;
tokenAmount = _getTokenAmount(ethAmount);
// should pass the check that presale has started, so no underflow here
uint256 daysID = (block.timestamp - saleStartTime) / DISTRIBUTE_PERIOD_UNIT;
assert(daysID < 2**16); // should have only few days for presale
// record new swap
SwapData memory _swapData = SwapData({
user: sender,
eAmount: uint80(ethAmount),
tAmount: uint80(tokenAmount),
dAmount: uint80(0),
daysID: uint16(daysID)
});
listSwaps.push(_swapData);
// update user swap data
userSwapData[sender].push(listSwaps.length - 1);
// update total swap eth and token amounts
TotalSwappedData memory swappedData = totalData;
totalData = TotalSwappedData({
eAmount: swappedData.eAmount + uint128(ethAmount),
tAmount: swappedData.tAmount + uint128(tokenAmount)
});
// transfer eth to recipient
ethRecipient.transfer(ethAmount);
emit SwappedEthToTea(sender, ethAmount, tokenAmount, block.timestamp, uint16(daysID));
}
/// ================ DISTRIBUTE TOKENS ====================
/// @dev admin can call this function to perform distribute to all eligible swaps
/// @param percentage percentage of undistributed amount will be distributed
/// @param daysID only distribute for swaps that were made at that day from start
function distributeAll(uint256 percentage, uint16 daysID)
external onlyWhitelistAdmin whenEnded whenNotPaused onlyValidPercentage(percentage)
returns (uint256 totalAmount)
{
for(uint256 i = 0; i < listSwaps.length; i++) {
if (listSwaps[i].daysID == daysID) {
totalAmount += _distributedToken(i, percentage);
}
}
totalDistributedToken = totalDistributedToken.add(totalAmount);
}
/// @dev admin can also use this function to distribute by batch,
/// in case distributeAll can be out of gas
/// @param percentage percentage of undistributed amount will be distributed
/// @param ids list of ids in the listSwaps to be distributed
function distributeBatch(uint256 percentage, uint256[] calldata ids)
external onlyWhitelistAdmin whenEnded whenNotPaused onlyValidPercentage(percentage)
returns (uint256 totalAmount)
{
uint256 len = listSwaps.length;
for(uint256 i = 0; i < ids.length; i++) {
require(ids[i] < len, "Distribute: invalid id");
// safe prevent duplicated ids in 1 batch
if (i > 0) require(ids[i - 1] < ids[i], "Distribute: indices are not in order");
totalAmount += _distributedToken(ids[i], percentage);
}
totalDistributedToken = totalDistributedToken.add(totalAmount);
}
/// ================ EMERGENCY FOR USER AND OWNER ====================
/// @dev in case after WITHDRAWAL_DEADLINE from end sale time
/// user can call this function to claim all of their tokens
/// also update user's swap records
function selfWithdrawToken() external returns (uint256 tokenAmount) {
require(
block.timestamp > WITHDRAWAL_DEADLINE + saleEndTime,
"Emergency: not open for emergency withdrawal"
);
address sender = msg.sender;
(, uint80 tAmount, uint80 dAmount) = _getUserSwappedAmount(sender);
tokenAmount = tAmount.sub(dAmount);
require(tokenAmount > 0, "Emergency: user has claimed all tokens");
require(
tokenAmount <= saleToken.balanceOf(address(this)),
"Emergency: not enough token to distribute"
);
// update each user's record
uint256[] memory ids = userSwapData[sender];
for(uint256 i = 0; i < ids.length; i++) {
// safe check
assert(listSwaps[ids[i]].user == sender);
// update distributed amount for each swap data
listSwaps[ids[i]].dAmount = listSwaps[ids[i]].tAmount;
}
totalDistributedToken = totalDistributedToken.add(tokenAmount);
// transfer token to user
address recipient = _transferToken(sender, tokenAmount);
emit SelfWithdrawToken(sender, recipient, tokenAmount, block.timestamp);
}
/// @dev emergency to allow owner withdraw eth or tokens inside the contract
/// in case anything happens
function emergencyOwnerWithdraw(IERC20 token, uint256 amount) external onlyOwner {
if (token == ETH_ADDRESS) {
// whenever someone transfer eth to this contract
// it will either to the swap or revert
// so there should be no eth inside the contract
msg.sender.transfer(amount);
} else {
token.safeTransfer(msg.sender, amount);
}
emit EmergencyOwnerWithdraw(msg.sender, token, amount);
}
/// @dev only in case user has lost their wallet, or wrongly send eth from third party platforms
function updateUserTokenRecipient(address user, address recipient) external onlyOwner {
require(recipient != address(0), "invalid recipient");
userTokenRecipient[user] = recipient;
emit UpdatedTokenRecipient(user, recipient);
}
/// ================ GETTERS ====================
function getNumberSwaps() external view returns (uint256) {
return listSwaps.length;
}
function getAllSwaps()
external view
returns (
address[] memory users,
uint80[] memory ethAmounts,
uint80[] memory tokenAmounts,
uint80[] memory distributedAmounts,
uint16[] memory daysIDs
)
{
uint256 len = listSwaps.length;
users = new address[](len);
ethAmounts = new uint80[](len);
tokenAmounts = new uint80[](len);
distributedAmounts = new uint80[](len);
daysIDs = new uint16[](len);
for(uint256 i = 0; i < len; i++) {
SwapData memory data = listSwaps[i];
users[i] = data.user;
ethAmounts[i] = data.eAmount;
tokenAmounts[i] = data.tAmount;
distributedAmounts[i] = data.dAmount;
daysIDs[i] = data.daysID;
}
}
/// @dev return full details data of a user
function getUserSwapData(address user)
external view
returns (
address tokenRecipient,
uint256 totalEthAmount,
uint80 totalTokenAmount,
uint80 distributedAmount,
uint80 remainingAmount,
uint80[] memory ethAmounts,
uint80[] memory tokenAmounts,
uint80[] memory distributedAmounts,
uint16[] memory daysIDs
)
{
tokenRecipient = _getRecipient(user);
(totalEthAmount, totalTokenAmount, distributedAmount) = _getUserSwappedAmount(user);
remainingAmount = totalTokenAmount - distributedAmount;
// record of all user's swaps
uint256[] memory swapDataIDs = userSwapData[user];
ethAmounts = new uint80[](swapDataIDs.length);
tokenAmounts = new uint80[](swapDataIDs.length);
distributedAmounts = new uint80[](swapDataIDs.length);
daysIDs = new uint16[](swapDataIDs.length);
for(uint256 i = 0; i < swapDataIDs.length; i++) {
ethAmounts[i] = listSwaps[swapDataIDs[i]].eAmount;
tokenAmounts[i] = listSwaps[swapDataIDs[i]].tAmount;
distributedAmounts[i] = listSwaps[swapDataIDs[i]].dAmount;
daysIDs[i] = listSwaps[swapDataIDs[i]].daysID;
}
}
function getData()
external view
returns(
uint256 _startTime,
uint256 _endTime,
uint256 _rate,
address _ethRecipient,
uint128 _tAmount,
uint128 _eAmount,
uint256 _hardcap
)
{
_startTime = saleStartTime;
_endTime = saleEndTime;
_rate = saleRate;
_ethRecipient = ethRecipient;
_tAmount = totalData.tAmount;
_eAmount = totalData.eAmount;
_hardcap = HARD_CAP;
}
/// @dev returns list of users and distributed amounts if user calls distributeAll function
/// in case anything is wrong, it will fail and not return anything
/// @param percentage percentage of undistributed amount will be distributed
/// @param daysID only distribute for swaps that were made at daysID from start
function estimateDistributedAllData(
uint80 percentage,
uint16 daysID
)
external view
whenEnded
whenNotPaused
onlyValidPercentage(percentage)
returns(
bool isSafe,
uint256 totalUsers,
uint256 totalDistributingAmount,
uint256[] memory selectedIds,
address[] memory users,
address[] memory recipients,
uint80[] memory distributingAmounts,
uint16[] memory daysIDs
)
{
// count number of data that can be distributed
totalUsers = 0;
for(uint256 i = 0; i < listSwaps.length; i++) {
if (listSwaps[i].daysID == daysID && listSwaps[i].tAmount > listSwaps[i].dAmount) {
totalUsers += 1;
}
}
// return data that will be used to distribute
selectedIds = new uint256[](totalUsers);
users = new address[](totalUsers);
recipients = new address[](totalUsers);
distributingAmounts = new uint80[](totalUsers);
daysIDs = new uint16[](totalUsers);
uint256 counter = 0;
for(uint256 i = 0; i < listSwaps.length; i++) {
SwapData memory data = listSwaps[i];
if (listSwaps[i].daysID == daysID && listSwaps[i].tAmount > listSwaps[i].dAmount) {
selectedIds[counter] = i;
users[counter] = data.user;
recipients[counter] = _getRecipient(data.user);
// don't need to use SafeMath here
distributingAmounts[counter] = data.tAmount * percentage / 100;
require(
distributingAmounts[counter] + data.dAmount <= data.tAmount,
"Estimate: total distribute more than 100%"
);
daysIDs[counter] = listSwaps[i].daysID;
totalDistributingAmount += distributingAmounts[counter];
counter += 1;
}
}
require(
totalDistributingAmount <= saleToken.balanceOf(address(this)),
"Estimate: not enough token balance"
);
isSafe = totalUsers <= SAFE_DISTRIBUTE_NUMBER;
}
/// @dev returns list of users and distributed amounts if user calls distributeBatch function
/// in case anything is wrong, it will fail and not return anything
/// @param percentage percentage of undistributed amount will be distributed
/// @param ids list indices to distribute in listSwaps
/// ids must be in asc order
function estimateDistributedBatchData(
uint80 percentage,
uint256[] calldata ids
)
external view
whenEnded
whenNotPaused
onlyValidPercentage(percentage)
returns(
bool isSafe,
uint256 totalUsers,
uint256 totalDistributingAmount,
uint256[] memory selectedIds,
address[] memory users,
address[] memory recipients,
uint80[] memory distributingAmounts,
uint16[] memory daysIDs
)
{
totalUsers = 0;
for(uint256 i = 0; i < ids.length; i++) {
require(ids[i] < listSwaps.length, "Estimate: id out of range");
if (i > 0) require(ids[i] > ids[i - 1], "Estimate: duplicated ids");
// has undistributed amount
if (listSwaps[i].tAmount > listSwaps[i].dAmount) totalUsers += 1;
}
// return data that will be used to distribute
selectedIds = new uint256[](totalUsers);
users = new address[](totalUsers);
recipients = new address[](totalUsers);
distributingAmounts = new uint80[](totalUsers);
daysIDs = new uint16[](totalUsers);
uint256 counter = 0;
for(uint256 i = 0; i < ids.length; i++) {
if (listSwaps[i].tAmount <= listSwaps[i].dAmount) continue;
SwapData memory data = listSwaps[ids[i]];
selectedIds[counter] = ids[i];
users[counter] = data.user;
recipients[counter] = _getRecipient(data.user);
// don't need to use SafeMath here
distributingAmounts[counter] = data.tAmount * percentage / 100;
require(
distributingAmounts[counter] + data.dAmount <= data.tAmount,
"Estimate: total distribute more than 100%"
);
totalDistributingAmount += distributingAmounts[counter];
daysIDs[counter] = listSwaps[i].daysID;
counter += 1;
}
require(
totalDistributingAmount <= saleToken.balanceOf(address(this)),
"Estimate: not enough token balance"
);
isSafe = totalUsers <= SAFE_DISTRIBUTE_NUMBER;
}
/// @dev calculate amount token to distribute and send to user
function _distributedToken(uint256 id, uint256 percentage)
internal
returns (uint256 distributingAmount)
{
SwapData memory data = listSwaps[id];
distributingAmount = uint256(data.tAmount).mul(percentage).div(100);
require(
distributingAmount.add(data.dAmount) <= data.tAmount,
"Distribute: total distribute more than 100%"
);
// percentage > 0, data.tAmount > 0
assert (distributingAmount > 0);
require(
distributingAmount <= saleToken.balanceOf(address(this)),
"Distribute: not enough token to distribute"
);
// no overflow, so don't need to use SafeMath here
listSwaps[id].dAmount += uint80(distributingAmount);
// send token to user's wallet
address recipient = _transferToken(data.user, distributingAmount);
emit Distributed(data.user, recipient, distributingAmount, percentage, block.timestamp);
}
function _transferToken(address user, uint256 amount) internal returns (address recipient) {
recipient = _getRecipient(user);
// safe check
assert(recipient != address(0));
saleToken.safeTransfer(recipient, amount);
}
function _getRecipient(address user) internal view returns(address recipient) {
recipient = userTokenRecipient[user];
if (recipient == address(0)) {
recipient = user;
}
}
/// @dev return received tokenAmount given ethAmount
/// note that token decimals is 18
function _getTokenAmount(uint256 ethAmount) internal view returns (uint256) {
return ethAmount.mul(saleRate);
}
function _getUserSwappedAmount(address sender)
internal view returns(
uint80 eAmount,
uint80 tAmount,
uint80 dAmount
)
{
uint256[] memory ids = userSwapData[sender];
for(uint256 i = 0; i < ids.length; i++) {
SwapData memory data = listSwaps[ids[i]];
eAmount += data.eAmount;
tAmount += data.tAmount;
dAmount += data.dAmount;
}
}
}