Contract Source Code:
File 1 of 1 : DPRStaking
pragma solidity ^0.5.12;
pragma experimental ABIEncoderV2;
/**
* @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;
}
}
/**
* @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);
}
/**
* @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");
}
}
/**
* @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");
}
}
}
/**
* @dev These functions deal with verification of Merkle trees (hash trees),
*/
library MerkleProof {
/**
* @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
* defined by `root`. For this, a `proof` must be provided, containing
* sibling hashes on the branch from the leaf to the root of the tree. Each
* pair of leaves and each pair of pre-images are assumed to be sorted.
*/
function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
bytes32 computedHash = leaf;
for (uint256 i = 0; i < proof.length; i++) {
bytes32 proofElement = proof[i];
if (computedHash <= proofElement) {
// Hash(current computed hash + current element of the proof)
computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
} else {
// Hash(current element of the proof + current computed hash)
computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
}
}
// Check if the computed hash (root) is equal to the provided root
return computedHash == root;
}
}
contract DPRStaking {
using SafeMath for uint256;
using SafeERC20 for IERC20;
uint256 DPR_UNIT = 10 ** 18;
struct Period{
bytes32 withdraw_root;
uint256 start_time;
uint256 end_time;
}
Period[] private periods;
IERC20 public dpr;
uint256 public staking_time = 270 days; // lock for 9 months
uint256 private total_release_time; // linear release in 3 months
uint256 private reward_time = 0;
address public owner;
address public migrate_address;
bool public pause;
mapping (address => uint256) private user_staking_period_index;
mapping (address => uint256) private user_staking_amount;
mapping (address => uint256) private user_release_time;
mapping (address => uint256) private user_claimed_map;
mapping (address => string) private dpr_address_mapping;
mapping (string => address) private address_dpr_mapping;
mapping (address => Period) private user_staking_periods;
mapping (address => uint256) private user_staking_time;
uint256[8] private staking_level = [
20000 * DPR_UNIT, // 100 credit
46800 * DPR_UNIT, // 200 credit
76800 * DPR_UNIT, // 300 credit
138000 * DPR_UNIT, // 400 credit
218000 * DPR_UNIT, // 500 credit
288000 * DPR_UNIT, // 600 credit
368000 * DPR_UNIT, // 700 credit
468000 * DPR_UNIT // 800 credit
];
//modifiers
modifier onlyOwner() {
require(msg.sender==owner, "DPRStaking: Only owner can operate this function");
_;
}
modifier whenNotPaused(){
require(pause == false, "DPRStaking: Pause!");
_;
}
//events
event Stake(address indexed user, string DPRAddress, uint256 indexed amount);
event StakeChange(address indexed user, uint256 indexed oldAmount, uint256 indexed newAmount);
event OwnerShipTransfer(address indexed oldOwner, address indexed newOwner);
event DPRAddressChange(bytes32 oldAddress, bytes32 newAddress);
event UserInfoChange(address indexed oldUser, address indexed newUser);
event WithdrawAllFunds(address indexed to);
event LinearTimeChange(uint256 day);
event WithdrawStaking(address indexed _address, uint256 indexed _amount);
event UpdateRewardTime(uint256 indexed _new_reward_time);
event EndTimeChanged(uint256 indexed _new_end_time);
event NewPeriod(uint256 indexed _start_time, uint256 indexed _end_time);
event Migrate(address indexed migrate_address, uint256 indexed migrate_amount);
event MigrateAddressSet(address indexed migrate_address);
event RootSet(bytes32 indexed root, uint256 indexed _index);
event ModifyPeriodTime(uint256 indexed _index, uint256 _start_time, uint256 _end_time);
constructor(IERC20 _dpr) public {
dpr = _dpr;
total_release_time = 90 days; // for initialize
owner = msg.sender;
}
function stake(string calldata DPRAddress, uint256 level) external whenNotPaused returns(bool){
//Check current lastest staking period
require(periods.length > 0, "DPRStaking: No active staking period");
Period memory lastest_period = periods[periods.length.sub(1)];
require(isInCurrentPeriod(),"DPRStaking: Staking not start or already end");
require(level <= staking_level.length.sub(1), "DPRStaking: Level does not exist");
require(user_staking_amount[msg.sender] == 0, "DPRStaking: Already stake, use addStaking instead");
//check if address already set DPRAddress and DPRAddress is not in use
checkDPRAddress(msg.sender, DPRAddress);
uint256 staking_amount = staking_level[level];
dpr.safeTransferFrom(msg.sender, address(this), staking_amount);
user_staking_amount[msg.sender] = staking_amount;
user_staking_time[msg.sender] = block.timestamp;
dpr_address_mapping[msg.sender] = DPRAddress;
address_dpr_mapping[DPRAddress] = msg.sender;
//update user staking period
user_staking_periods[msg.sender] = lastest_period;
user_staking_period_index[msg.sender] = periods.length.sub(1);
emit Stake(msg.sender, DPRAddress, staking_amount);
return true;
}
function addStaking(uint256 level) external whenNotPaused returns(bool) {
// staking period checking
require(periods.length >0, "DPRStaking: No active staking period");
require(checkPeriod(msg.sender), "DRPStaking: Not current period, try to move to lastest period");
require(isInCurrentPeriod(), "DPRStaking: Staking not start or already end");
require(level <= staking_level.length.sub(1), "DPRStaking: Level does not exist");
uint256 newStakingAmount = staking_level[level];
uint256 oldStakingAmount = user_staking_amount[msg.sender];
require(oldStakingAmount > 0, "DPRStaking: Please Stake first");
require(oldStakingAmount < newStakingAmount, "DPRStaking: Can only upgrade your level");
uint256 difference = newStakingAmount.sub(oldStakingAmount);
dpr.safeTransferFrom(msg.sender, address(this), difference);
//update user staking amount
user_staking_amount[msg.sender] = staking_level[level];
user_staking_time[msg.sender] = block.timestamp;
emit StakeChange(msg.sender, oldStakingAmount, newStakingAmount);
return true;
}
function claim() external whenNotPaused returns(bool){
require(reward_time > 0, "DPRStaking: Reward time not set");
require(block.timestamp >= reward_time.add(staking_time), "DPRStaking: Not reach the release time");
if(user_release_time[msg.sender] == 0){
user_release_time[msg.sender] = reward_time.add(staking_time);
}
// user staking end time checking
require(block.timestamp >= user_release_time[msg.sender], "DPRStaking: Not release period");
uint256 staking_amount = user_staking_amount[msg.sender];
require(staking_amount > 0, "DPRStaking: Must stake first");
uint256 user_claimed = user_claimed_map[msg.sender];
uint256 claim_per_period = staking_amount.mul(1 days).div(total_release_time);
uint256 time_pass = block.timestamp.sub(user_release_time[msg.sender]).div(1 days);
uint256 total_claim_amount = claim_per_period * time_pass;
if(total_claim_amount >= user_staking_amount[msg.sender]){
total_claim_amount = user_staking_amount[msg.sender];
user_staking_amount[msg.sender] = 0;
}
user_claimed_map[msg.sender] = total_claim_amount;
uint256 claim_this_time = total_claim_amount.sub(user_claimed);
dpr.safeTransfer(msg.sender, claim_this_time);
return true;
}
function transferOwnership(address newOwner) onlyOwner external returns(bool){
require(newOwner != address(0), "DPRStaking: Transfer Ownership to zero address");
owner = newOwner;
emit OwnerShipTransfer(msg.sender, newOwner);
}
//for emergency case, Deeper Offical can help users to modify their staking info
function modifyUserAddress(address user, string calldata DPRAddress) external onlyOwner returns(bool){
require(user_staking_amount[user] > 0, "DPRStaking: User does not have any record");
require(address_dpr_mapping[DPRAddress] == address(0), "DPRStaking: DPRAddress already in use");
bytes32 oldDPRAddressHash = keccak256(abi.encodePacked(dpr_address_mapping[user]));
bytes32 newDPRAddressHash = keccak256(abi.encodePacked(DPRAddress));
require(oldDPRAddressHash != newDPRAddressHash, "DPRStaking: DPRAddress is same");
dpr_address_mapping[user] = DPRAddress;
delete address_dpr_mapping[dpr_address_mapping[user]];
address_dpr_mapping[DPRAddress] = user;
emit DPRAddressChange(oldDPRAddressHash, newDPRAddressHash);
return true;
}
//for emergency case(User lost their control of their accounts), Deeper Offical can help users to transfer their staking info to a new address
function transferUserInfo(address oldUser, address newUser) external onlyOwner returns(bool){
require(oldUser != newUser, "DPRStaking: Address are same");
require(user_staking_amount[oldUser] > 0, "DPRStaking: Old user does not have any record");
require(user_staking_amount[newUser] == 0, "DPRStaking: New user must a clean address");
//Transfer Staking Info
user_staking_amount[newUser] = user_staking_amount[oldUser];
user_staking_period_index[newUser] = user_staking_period_index[oldUser];
user_staking_periods[newUser] = user_staking_periods[oldUser];
//Transfer release Info
user_release_time[newUser] = user_release_time[oldUser];
//Transfer claim Info
user_claimed_map[newUser] = user_claimed_map[oldUser];
//Transfer address mapping info
address_dpr_mapping[dpr_address_mapping[oldUser]] = newUser;
dpr_address_mapping[newUser] = dpr_address_mapping[oldUser];
user_staking_time[msg.sender] = block.timestamp;
//clear account
clearAccount(oldUser,false);
emit UserInfoChange(oldUser, newUser);
return true;
}
//for emergency case, Deeper Offical have permission to withdraw all fund in the contract
function withdrawAllFund(uint256 amount) external onlyOwner returns(bool){
dpr.safeTransfer(owner,amount);
emit WithdrawAllFunds(owner);
return true;
}
function setRootForPeriod(bytes32 root, uint256 index) external onlyOwner returns(bool){
require(index <= periods.length.sub(1), "DPRStaking: Not that period");
Period storage period_to_modify = periods[index];
period_to_modify.withdraw_root = root;
emit RootSet(root, index);
return true;
}
function modifyPeriodTime(uint256 index, uint256 start_time, uint256 end_time) external onlyOwner returns(bool){
require(periods.length > 0, "DPRStaking: No period");
require(index <= periods.length.sub(1), "DPRStaking: Wrong Period");
Period storage period = periods[index];
period.start_time = start_time;
period.end_time = end_time;
emit ModifyPeriodTime(index, start_time, end_time);
}
//Change the linear time before claim start
//if reward_time is 0, means mainnet not lanuch, so there is no need to check the reward time
function modifyLinearTime(uint256 newdays) onlyOwner external returns(bool){
require(block.timestamp <= reward_time.add(staking_time), "DPRStaking: Claim period has started");
total_release_time = newdays * 86400;
emit LinearTimeChange(newdays);
return true;
}
function setPause(bool is_pause) external onlyOwner returns(bool){
pause = is_pause;
return true;
}
function clearAccount(address user, bool is_clear_address) private{
delete user_staking_amount[user];
delete user_release_time[user];
delete user_claimed_map[user];
delete user_staking_period_index[user];
delete user_staking_periods[user];
delete user_staking_time[user];
if(is_clear_address){
delete address_dpr_mapping[dpr_address_mapping[user]];
}
delete dpr_address_mapping[user];
}
function generateUserHash(address user) private returns(bytes32){
uint256 staking_amount = user_staking_amount[user];
return keccak256(abi.encodePacked(user, staking_amount));
}
function moveToLastestPeriod() external returns(bool){
uint256 staking_amount = user_staking_amount[msg.sender];
require(staking_amount > 0, "DPRStaking: User does not stake");
Period memory lastest_period = periods[periods.length.sub(1)];
require(isInCurrentPeriod(), "DPRStaking: Not in current period");
//if user's period is same as the current period, means there is no new period
require(!checkPeriod(msg.sender), "DPRStaking: No new staking period");
user_staking_periods[msg.sender] = lastest_period;
user_staking_period_index[msg.sender] = periods.length.sub(1);
}
//only allow user withdraw his fund in one period
//for user withdraw their fund before staking end
function withdrawStaking(bytes32[] calldata path, address user) external returns(bool){
require(periods.length >=0, "DPRStaking: No active staking period");
uint256 index = user_staking_period_index[user];
bytes32 root = periods[index].withdraw_root;
bytes32 user_node = generateUserHash(user);
require(MerkleProof.verify(path, root, user_node), "DPRStaking: User not allow to withdraw");
uint256 withdraw_amount = user_staking_amount[user];
require(withdraw_amount >0, "DPRStaking: User does not stake");
require(withdraw_amount <= dpr.balanceOf(address(this)), "DPRStaking: Not enough balanbce");
clearAccount(user, true);
dpr.safeTransfer(user, withdraw_amount);
emit WithdrawStaking(user, withdraw_amount);
return true;
}
function addStakingPeriod(uint256 _start_time, uint256 _end_time) external onlyOwner returns(bool){
require(_end_time >= _start_time, "DPRStaking: Time error");
if(periods.length != 0){
Period memory lastest_period = periods[periods.length.sub(1)];
uint256 end_time = lastest_period.end_time;
require(block.timestamp > end_time, "DPRStaking: last period was not end");
}
Period memory p;
p.start_time = _start_time;
p.end_time = _end_time;
periods.push(p);
emit NewPeriod(_start_time, _end_time);
return true;
}
//modify reward time
function setRewardTime(uint256 _new_reward_time) external onlyOwner returns(bool){
require(reward_time == 0, "DPRStaking: Reward time is already set");
reward_time = _new_reward_time;
emit UpdateRewardTime(_new_reward_time);
return true;
}
//when staking end, user can choose to migrate their fund to new contract
function migrate() external returns(bool){
uint256 staking_amount = user_staking_amount[msg.sender];
require(staking_amount >0, "DPRStaking: User does not stake");
require(migrate_address != address(0), "DPRStaking: Staking not start");
clearAccount(msg.sender, true);
dpr.safeTransfer(migrate_address, staking_amount);
emit Migrate(migrate_address, staking_amount);
return true;
}
function setMigrateAddress(address _migrate_address) external onlyOwner returns(bool){
migrate_address = _migrate_address;
emit MigrateAddressSet(_migrate_address);
return true;
}
function checkPeriod(address user) private returns(bool){
Period memory lastest_period = periods[periods.length.sub(1)];
Period memory user_period = user_staking_periods[user];
return(lastest_period.start_time == user_period.start_time && lastest_period.end_time == user_period.end_time);
}
function checkDPRAddress(address _address, string memory _dprAddress) private{
require(keccak256(abi.encodePacked(dpr_address_mapping[_address])) == bytes32(hex"c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"), "DPRStaking: DPRAddress already set");
require(address_dpr_mapping[_dprAddress] == address(0), "DPRStaking: ETH address already bind an DPRAddress");
}
function isInCurrentPeriod() private returns(bool){
Period memory lastest_period = periods[periods.length.sub(1)];
uint256 start_time = lastest_period.start_time;
uint256 end_time = lastest_period.end_time;
return (block.timestamp >= start_time && end_time >= block.timestamp);
}
function getUserDPRAddress(address user) external view returns(string memory){
return dpr_address_mapping[user];
}
function getUserAddressByDPRAddress(string calldata dpr_address) external view returns(address){
return address_dpr_mapping[dpr_address];
}
function getReleaseTime(address user) external view returns(uint256){
return user_release_time[user];
}
function getStaking(address user) external view returns(uint256){
return user_staking_amount[user];
}
function getUserReleasePerDay(address user) external view returns(uint256){
uint256 staking_amount = user_staking_amount[user];
uint256 release_per_day = staking_amount.mul(1 days).div(total_release_time);
return release_per_day;
}
function getUserClaimInfo(address user) external view returns(uint256){
return user_claimed_map[user];
}
function getReleaseTimeInDays() external view returns(uint256){
return total_release_time.div(1 days);
}
function getPeriodInfo(uint256 index) external view returns (Period memory){
return periods[index];
}
function getRewardTime() external view returns(uint256){
return reward_time;
}
function getUserStakingPeriod(address user) external view returns(Period memory){
return user_staking_periods[user];
}
function getUserStakingIndex(address user) external view returns(uint256){
return user_staking_period_index[user];
}
function getUserStakingTime(address user) external view returns(uint256){
return user_staking_time[user];
}
}