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Overview
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ContractCreator
Latest 25 from a total of 2,571 transactions
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| Payout Reward T1 | 12855880 | 1241 days ago | IN | 0 ETH | 0.00347625 | ||||
| Payout Reward T1 | 12855880 | 1241 days ago | IN | 0 ETH | 0.01105498 | ||||
| Payout Reward T1 | 12855880 | 1241 days ago | IN | 0 ETH | 0.00396 | ||||
| Payout Reward T1 | 12548491 | 1289 days ago | IN | 0 ETH | 0.00134283 | ||||
| Payout Reward T1 | 12544959 | 1290 days ago | IN | 0 ETH | 0.00200787 | ||||
| Payout Reward T1 | 12544956 | 1290 days ago | IN | 0 ETH | 0.00200787 | ||||
| Payout Reward T1 | 12544956 | 1290 days ago | IN | 0 ETH | 0.00200787 | ||||
| Payout Reward T1 | 12544933 | 1290 days ago | IN | 0 ETH | 0.00267744 | ||||
| Payout Reward T1 | 12542876 | 1290 days ago | IN | 0 ETH | 0.00391078 | ||||
| Payout Reward T1 | 12542868 | 1290 days ago | IN | 0 ETH | 0.00318656 | ||||
| Payout Reward T1 | 12542857 | 1290 days ago | IN | 0 ETH | 0.00325899 | ||||
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| Payout Reward T1 | 12542783 | 1290 days ago | IN | 0 ETH | 0.00246234 | ||||
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Contract Name:
NFTeGG_Farm_3_Final
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2020-12-03
*/
/**
*Submitted for verification at Etherscan.io on 2020-11-25
*/
// SPDX-License-Identifier: MIT
pragma solidity ^0.6.0;
/**
* @dev String operations.
*/
library Strings {
/**
* @dev Converts a `uint256` to its ASCII `string` representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
uint256 index = digits - 1;
temp = value;
while (temp != 0) {
buffer[index--] = byte(uint8(48 + temp % 10));
temp /= 10;
}
return string(buffer);
}
}
/**
* @dev Library for managing an enumerable variant of Solidity's
* https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
* type.
*
* Maps have the following properties:
*
* - Entries are added, removed, and checked for existence in constant time
* (O(1)).
* - Entries are enumerated in O(n). No guarantees are made on the ordering.
*
* ```
* contract Example {
* // Add the library methods
* using EnumerableMap for EnumerableMap.UintToAddressMap;
*
* // Declare a set state variable
* EnumerableMap.UintToAddressMap private myMap;
* }
* ```
*
* As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
* supported.
*/
library EnumerableMap {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Map type with
// bytes32 keys and values.
// The Map implementation uses private functions, and user-facing
// implementations (such as Uint256ToAddressMap) are just wrappers around
// the underlying Map.
// This means that we can only create new EnumerableMaps for types that fit
// in bytes32.
struct MapEntry {
bytes32 _key;
bytes32 _value;
}
struct Map {
// Storage of map keys and values
MapEntry[] _entries;
// Position of the entry defined by a key in the `entries` array, plus 1
// because index 0 means a key is not in the map.
mapping (bytes32 => uint256) _indexes;
}
/**
* @dev Adds a key-value pair to a map, or updates the value for an existing
* key. O(1).
*
* Returns true if the key was added to the map, that is if it was not
* already present.
*/
function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
// We read and store the key's index to prevent multiple reads from the same storage slot
uint256 keyIndex = map._indexes[key];
if (keyIndex == 0) { // Equivalent to !contains(map, key)
map._entries.push(MapEntry({ _key: key, _value: value }));
// The entry is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
map._indexes[key] = map._entries.length;
return true;
} else {
map._entries[keyIndex - 1]._value = value;
return false;
}
}
/**
* @dev Removes a key-value pair from a map. O(1).
*
* Returns true if the key was removed from the map, that is if it was present.
*/
function _remove(Map storage map, bytes32 key) private returns (bool) {
// We read and store the key's index to prevent multiple reads from the same storage slot
uint256 keyIndex = map._indexes[key];
if (keyIndex != 0) { // Equivalent to contains(map, key)
// To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
// in the array, and then remove the last entry (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 toDeleteIndex = keyIndex - 1;
uint256 lastIndex = map._entries.length - 1;
// When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
MapEntry storage lastEntry = map._entries[lastIndex];
// Move the last entry to the index where the entry to delete is
map._entries[toDeleteIndex] = lastEntry;
// Update the index for the moved entry
map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based
// Delete the slot where the moved entry was stored
map._entries.pop();
// Delete the index for the deleted slot
delete map._indexes[key];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the key is in the map. O(1).
*/
function _contains(Map storage map, bytes32 key) private view returns (bool) {
return map._indexes[key] != 0;
}
/**
* @dev Returns the number of key-value pairs in the map. O(1).
*/
function _length(Map storage map) private view returns (uint256) {
return map._entries.length;
}
/**
* @dev Returns the key-value pair stored at position `index` in the map. O(1).
*
* Note that there are no guarantees on the ordering of entries inside the
* array, and it may change when more entries are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
require(map._entries.length > index, "EnumerableMap: index out of bounds");
MapEntry storage entry = map._entries[index];
return (entry._key, entry._value);
}
/**
* @dev Returns the value associated with `key`. O(1).
*
* Requirements:
*
* - `key` must be in the map.
*/
function _get(Map storage map, bytes32 key) private view returns (bytes32) {
return _get(map, key, "EnumerableMap: nonexistent key");
}
/**
* @dev Same as {_get}, with a custom error message when `key` is not in the map.
*/
function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
uint256 keyIndex = map._indexes[key];
require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
return map._entries[keyIndex - 1]._value; // All indexes are 1-based
}
// UintToAddressMap
struct UintToAddressMap {
Map _inner;
}
/**
* @dev Adds a key-value pair to a map, or updates the value for an existing
* key. O(1).
*
* Returns true if the key was added to the map, that is if it was not
* already present.
*/
function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
return _set(map._inner, bytes32(key), bytes32(uint256(value)));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the key was removed from the map, that is if it was present.
*/
function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
return _remove(map._inner, bytes32(key));
}
/**
* @dev Returns true if the key is in the map. O(1).
*/
function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
return _contains(map._inner, bytes32(key));
}
/**
* @dev Returns the number of elements in the map. O(1).
*/
function length(UintToAddressMap storage map) internal view returns (uint256) {
return _length(map._inner);
}
/**
* @dev Returns the element stored at position `index` in the set. O(1).
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
(bytes32 key, bytes32 value) = _at(map._inner, index);
return (uint256(key), address(uint256(value)));
}
/**
* @dev Returns the value associated with `key`. O(1).
*
* Requirements:
*
* - `key` must be in the map.
*/
function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
return address(uint256(_get(map._inner, bytes32(key))));
}
/**
* @dev Same as {get}, with a custom error message when `key` is not in the map.
*/
function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
return address(uint256(_get(map._inner, bytes32(key), errorMessage)));
}
}
/**
* @dev Library for managing
* https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
* types.
*
* Sets have the following properties:
*
* - Elements are added, removed, and checked for existence in constant time
* (O(1)).
* - Elements are enumerated in O(n). No guarantees are made on the ordering.
*
* ```
* contract Example {
* // Add the library methods
* using EnumerableSet for EnumerableSet.AddressSet;
*
* // Declare a set state variable
* EnumerableSet.AddressSet private mySet;
* }
* ```
*
* As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256`
* (`UintSet`) are supported.
*/
library EnumerableSet {
// To implement this library for multiple types with as little code
// repetition as possible, we write it in terms of a generic Set type with
// bytes32 values.
// The Set implementation uses private functions, and user-facing
// implementations (such as AddressSet) are just wrappers around the
// underlying Set.
// This means that we can only create new EnumerableSets for types that fit
// in bytes32.
struct Set {
// Storage of set values
bytes32[] _values;
// Position of the value in the `values` array, plus 1 because index 0
// means a value is not in the set.
mapping (bytes32 => uint256) _indexes;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function _add(Set storage set, bytes32 value) private returns (bool) {
if (!_contains(set, value)) {
set._values.push(value);
// The value is stored at length-1, but we add 1 to all indexes
// and use 0 as a sentinel value
set._indexes[value] = set._values.length;
return true;
} else {
return false;
}
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function _remove(Set storage set, bytes32 value) private returns (bool) {
// We read and store the value's index to prevent multiple reads from the same storage slot
uint256 valueIndex = set._indexes[value];
if (valueIndex != 0) { // Equivalent to contains(set, value)
// To delete an element from the _values array in O(1), we swap the element to delete with the last one in
// the array, and then remove the last element (sometimes called as 'swap and pop').
// This modifies the order of the array, as noted in {at}.
uint256 toDeleteIndex = valueIndex - 1;
uint256 lastIndex = set._values.length - 1;
// When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
// so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
bytes32 lastvalue = set._values[lastIndex];
// Move the last value to the index where the value to delete is
set._values[toDeleteIndex] = lastvalue;
// Update the index for the moved value
set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based
// Delete the slot where the moved value was stored
set._values.pop();
// Delete the index for the deleted slot
delete set._indexes[value];
return true;
} else {
return false;
}
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function _contains(Set storage set, bytes32 value) private view returns (bool) {
return set._indexes[value] != 0;
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function _length(Set storage set) private view returns (uint256) {
return set._values.length;
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function _at(Set storage set, uint256 index) private view returns (bytes32) {
require(set._values.length > index, "EnumerableSet: index out of bounds");
return set._values[index];
}
// AddressSet
struct AddressSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(AddressSet storage set, address value) internal returns (bool) {
return _add(set._inner, bytes32(uint256(value)));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(AddressSet storage set, address value) internal returns (bool) {
return _remove(set._inner, bytes32(uint256(value)));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(AddressSet storage set, address value) internal view returns (bool) {
return _contains(set._inner, bytes32(uint256(value)));
}
/**
* @dev Returns the number of values in the set. O(1).
*/
function length(AddressSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(AddressSet storage set, uint256 index) internal view returns (address) {
return address(uint256(_at(set._inner, index)));
}
// UintSet
struct UintSet {
Set _inner;
}
/**
* @dev Add a value to a set. O(1).
*
* Returns true if the value was added to the set, that is if it was not
* already present.
*/
function add(UintSet storage set, uint256 value) internal returns (bool) {
return _add(set._inner, bytes32(value));
}
/**
* @dev Removes a value from a set. O(1).
*
* Returns true if the value was removed from the set, that is if it was
* present.
*/
function remove(UintSet storage set, uint256 value) internal returns (bool) {
return _remove(set._inner, bytes32(value));
}
/**
* @dev Returns true if the value is in the set. O(1).
*/
function contains(UintSet storage set, uint256 value) internal view returns (bool) {
return _contains(set._inner, bytes32(value));
}
/**
* @dev Returns the number of values on the set. O(1).
*/
function length(UintSet storage set) internal view returns (uint256) {
return _length(set._inner);
}
/**
* @dev Returns the value stored at position `index` in the set. O(1).
*
* Note that there are no guarantees on the ordering of values inside the
* array, and it may change when more values are added or removed.
*
* Requirements:
*
* - `index` must be strictly less than {length}.
*/
function at(UintSet storage set, uint256 index) internal view returns (uint256) {
return uint256(_at(set._inner, index));
}
}
/**
* @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) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
/**
* @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].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain`call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.staticcall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.3._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.3._
*/
function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return _verifyCallResult(success, returndata, errorMessage);
}
function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
/**
* @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.
*/
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.
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
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.
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}
/*
* @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.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address payable) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
/**
* @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);
}
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
/**
* @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.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* 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(_owner == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
/**
* @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 IERC20;` 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));
}
/**
* @dev Deprecated. This function has issues similar to the ones found in
* {IERC20-approve}, and its usage is discouraged.
*
* Whenever possible, use {safeIncreaseAllowance} and
* {safeDecreaseAllowance} instead.
*/
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. We use {Address.functionCall} to perform this call, which verifies that
// the target address contains contract code and also asserts for success in the low-level call.
bytes memory returndata = address(token).functionCall(data, "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 Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(address from, address to, uint256 tokenId) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Enumerable is IERC721 {
/**
* @dev Returns the total amount of tokens stored by the contract.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns a token ID owned by `owner` at a given `index` of its token list.
* Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
/**
* @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
* Use along with {totalSupply} to enumerate all tokens.
*/
function tokenByIndex(uint256 index) external view returns (uint256);
}
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts may inherit from this and call {_registerInterface} to declare
* their support of an interface.
*/
contract ERC165 is IERC165 {
/*
* bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
*/
bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
/**
* @dev Mapping of interface ids to whether or not it's supported.
*/
mapping(bytes4 => bool) private _supportedInterfaces;
constructor () internal {
// Derived contracts need only register support for their own interfaces,
// we register support for ERC165 itself here
_registerInterface(_INTERFACE_ID_ERC165);
}
/**
* @dev See {IERC165-supportsInterface}.
*
* Time complexity O(1), guaranteed to always use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) public view override returns (bool) {
return _supportedInterfaces[interfaceId];
}
/**
* @dev Registers the contract as an implementer of the interface defined by
* `interfaceId`. Support of the actual ERC165 interface is automatic and
* registering its interface id is not required.
*
* See {IERC165-supportsInterface}.
*
* Requirements:
*
* - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
*/
function _registerInterface(bytes4 interfaceId) internal virtual {
require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
_supportedInterfaces[interfaceId] = true;
}
}
/**
* @dev Contract module that can be used to recover ERC20 compatible tokens stuck in the contract.
*/
contract ERC20Recoverable is Ownable {
/**
* @dev Used to transfer tokens stuck on this contract to another address.
*/
function recoverERC20(address token, address recipient, uint256 amount) external onlyOwner returns (bool) {
return IERC20(token).transfer(recipient, amount);
}
/**
* @dev Used to approve recovery of stuck tokens. May also be used to approve token transfers in advance.
*/
function recoverERC20Approve(address token, address spender, uint256 amount) external onlyOwner returns (bool) {
return IERC20(token).approve(spender, amount);
}
}
/**
* @dev Contract module that can be used to recover ERC20 compatible tokens stuck in the contract.
*/
contract ERC721Recoverable is Ownable {
/**
* @dev Used to recover a stuck token.
*/
function recoverERC721(address token, address recipient, uint256 tokenId) external onlyOwner {
return IERC721(token).transferFrom(address(this), recipient, tokenId);
}
/**
* @dev Used to recover a stuck token using the safe transfer function of ERC721.
*/
function recoverERC721Safe(address token, address recipient, uint256 tokenId) external onlyOwner {
return IERC721(token).safeTransferFrom(address(this), recipient, tokenId);
}
/**
* @dev Used to approve the recovery of a stuck token.
*/
function recoverERC721Approve(address token, address recipient, uint256 tokenId) external onlyOwner {
return IERC721(token).approve(recipient, tokenId);
}
/**
* @dev Used to approve the recovery of stuck token, also in future.
*/
function recoverERC721ApproveAll(address token, address recipient, bool approved) external onlyOwner {
return IERC721(token).setApprovalForAll(recipient, approved);
}
}
/**
* @dev Most credited to OpenZeppelin ERC721.sol, but with some adjustments.
*/
contract T2 is Context, Ownable, ERC165, IERC721, IERC721Metadata, IERC721Enumerable, ERC20Recoverable, ERC721Recoverable {
using SafeMath for uint256;
using Address for address;
using EnumerableSet for EnumerableSet.UintSet;
using EnumerableMap for EnumerableMap.UintToAddressMap;
using Strings for uint256;
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
// Mapping from holder address to their (enumerable) set of owned tokens
mapping (address => EnumerableSet.UintSet) private _holderTokens;
// Enumerable mapping from token ids to their owners
EnumerableMap.UintToAddressMap private _tokenOwners;
// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) private _operatorApprovals;
// Token name
string private _name;
// Token symbol
string private _symbol;
// Base URI
string private _baseURI;
// Specified if tokens are transferable. Can be flipped by the owner.
bool private _transferable;
// Price per token. Is chosen and can be changed by contract owner.
uint256 private _tokenPrice;
// Counter for token id
uint256 private _nextId = 1;
/*
* bytes4(keccak256('balanceOf(address)')) == 0x70a08231
* bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
* bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
* bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
* bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
* bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
* bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
*
* => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
* 0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
*/
bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
/*
* bytes4(keccak256('name()')) == 0x06fdde03
* bytes4(keccak256('symbol()')) == 0x95d89b41
* bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
*
* => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
*/
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
/*
* bytes4(keccak256('totalSupply()')) == 0x18160ddd
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
* bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
*
* => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
*/
bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor (string memory name, string memory symbol, string memory baseURI, bool transferable, uint256 tokenPrice) public {
_name = name;
_symbol = symbol;
_baseURI = baseURI;
_transferable = transferable;
_tokenPrice = tokenPrice;
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721);
_registerInterface(_INTERFACE_ID_ERC721_METADATA);
_registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
}
// public functions:
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) external view override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _holderTokens[owner].length();
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view override returns (address) {
return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() external view override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() external view override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) external view override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
// If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
return string(abi.encodePacked(_baseURI, tokenId.toString()));
}
/**
* @dev Returns the base URI set via {_setBaseURI}. This will be
* automatically added as a prefix in {tokenURI} to each token's URI, or
* to the token ID if no specific URI is set for that token ID.
*/
function baseURI() external view returns (string memory) {
return _baseURI;
}
/**
* @dev Returns if tokens are globally transferable currently. That may be decided by the contract owner.
*/
function transferable() external view returns (bool) {
return _transferable;
}
/**
* @dev Price per token for public purchase.
*/
function tokenPrice() external view returns (uint256) {
return _tokenPrice;
}
/**
* @dev Next token id.
*/
function nextTokenId() public view returns (uint256) {
return _nextId;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view override returns (uint256) {
return _holderTokens[owner].at(index);
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() external view override returns (uint256) {
// _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
return _tokenOwners.length();
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) external view override returns (uint256) {
(uint256 tokenId, ) = _tokenOwners.at(index);
return tokenId;
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) external virtual override {
address owner = ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) external virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(address from, address to, uint256 tokenId) external virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
function buyToken() external payable returns (bool)
{
uint256 paidAmount = msg.value;
require(paidAmount == _tokenPrice, "Invalid amount for token purchase");
_mint(msg.sender, nextTokenId());
_incrementTokenId();
payable(owner()).transfer(paidAmount);
return true;
}
/**
* @dev Burns `tokenId`. See {ERC721-_burn}.
*
* Requirements:
*
* - The caller must own `tokenId` or be an approved operator.
*/
function burn(uint256 tokenId) public returns (bool) {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved");
_burn(tokenId);
return true;
}
function burnAnyFrom(address burner) public returns (bool) {
require(_holderTokens[burner].length() > 0, "Address does not have any tokens to burn");
return burn(_holderTokens[burner].at(0));
}
function burnAny() external returns (bool) {
return burnAnyFrom(msg.sender);
}
// owner functions:
/**
* @dev Function to set the base URI for all token IDs. It is automatically added as a prefix to the token id in {tokenURI} to retrieve the token URI.
*/
function setBaseURI(string calldata baseURI_) external onlyOwner {
_baseURI = baseURI_;
}
/**
* @dev Function for the contract owner to allow or disallow token transfers.
*/
function setTransferable(bool allowed) external onlyOwner {
_transferable = allowed;
}
/**
* @dev Sets a new token price.
*/
function setTokenPrice(uint256 newPrice) external onlyOwner {
_tokenPrice = newPrice;
}
// internal functions:
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) private {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) private view returns (bool) {
return _tokenOwners.contains(tokenId);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) private view returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
d*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) private {
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(address to, uint256 tokenId, bytes memory _data) private {
_mint(to, tokenId);
require(_checkOnERC721Received(address(0), to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/
function _mint(address to, uint256 tokenId) private {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_holderTokens[to].add(tokenId);
_tokenOwners.set(tokenId, to);
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ownerOf(tokenId);
// Clear approvals
_approve(address(0), tokenId);
_holderTokens[owner].remove(tokenId);
_tokenOwners.remove(tokenId);
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - contract owner must have transfer globally allowed.
*
* Emits a {Transfer} event.
*/
function _transfer(address from, address to, uint256 tokenId) private {
require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
require(_transferable == true, "ERC721 transfer not permitted by contract owner");
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_holderTokens[from].remove(tokenId);
_holderTokens[to].add(tokenId);
_tokenOwners.set(tokenId, to);
emit Transfer(from, to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) private returns (bool)
{
if (!to.isContract()) {
return true;
}
bytes memory returndata = to.functionCall(abi.encodeWithSelector(
IERC721Receiver(to).onERC721Received.selector,
_msgSender(),
from,
tokenId,
_data
), "ERC721: transfer to non ERC721Receiver implementer");
bytes4 retval = abi.decode(returndata, (bytes4));
return (retval == _ERC721_RECEIVED);
}
function _approve(address to, uint256 tokenId) private {
_tokenApprovals[tokenId] = to;
emit Approval(ownerOf(tokenId), to, tokenId);
}
function _incrementTokenId() private {
_nextId = _nextId.add(1);
}
}
/**
* @dev Most credited to OpenZeppelin ERC721.sol, but with some adjustments.
*/
contract T1 is Context, Ownable, ERC165, IERC721, IERC721Metadata, IERC721Enumerable, ERC20Recoverable, ERC721Recoverable {
using SafeMath for uint256;
using Address for address;
using EnumerableSet for EnumerableSet.UintSet;
using EnumerableMap for EnumerableMap.UintToAddressMap;
using Strings for uint256;
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
// Mapping from holder address to their (enumerable) set of owned tokens
mapping (address => EnumerableSet.UintSet) private _holderTokens;
// Enumerable mapping from token ids to their owners
EnumerableMap.UintToAddressMap private _tokenOwners;
// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) private _operatorApprovals;
// Token name
string private _name;
// Token symbol
string private _symbol;
// ERC721 token contract address serving as "ticket" to flip the bool in additional data
address private _ticketContract;
// Base URI
string private _baseURI;
// Price per token. Is chosen and can be changed by contract owner.
uint256 private _tokenPrice;
struct AdditionalData {
bool isA; // A (true) or B (false)
bool someBool; // may be flipped by token owner if he owns T2; default value in _mint
uint8 power;
}
// Mapping from token ID to its additional data
mapping (uint256 => AdditionalData) private _additionalData;
// Counter for token id, and types
uint256 private _nextId = 1;
uint32 private _countA = 0; // count of B is implicit and not needed
mapping (address => bool) public freeBoolSetters; // addresses which do not need to pay to set the bool variable
// limits
uint256 public constant MAX_SUPPLY = 7000;
uint32 public constant MAX_A = 1000;
uint32 public constant MAX_B = 6000;
/*
* bytes4(keccak256('balanceOf(address)')) == 0x70a08231
* bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
* bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
* bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
* bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
* bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
* bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
*
* => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
* 0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
*/
bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
/*
* bytes4(keccak256('name()')) == 0x06fdde03
* bytes4(keccak256('symbol()')) == 0x95d89b41
* bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
*
* => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
*/
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
/*
* bytes4(keccak256('totalSupply()')) == 0x18160ddd
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
* bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
*
* => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
*/
bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor (string memory name, string memory symbol, string memory baseURI, uint256 tokenPrice, address ticketContract) public {
_name = name;
_symbol = symbol;
_baseURI = baseURI;
_tokenPrice = tokenPrice;
_ticketContract = ticketContract;
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721);
_registerInterface(_INTERFACE_ID_ERC721_METADATA);
_registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
}
// public functions:
/**
* @dev See {IERC721-balanceOf}.
*/
function balanceOf(address owner) public view override returns (uint256) {
require(owner != address(0), "ERC721: balance query for the zero address");
return _holderTokens[owner].length();
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view override returns (address) {
return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() external view override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() external view override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) external view override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
// If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
return string(abi.encodePacked(_baseURI, tokenId.toString()));
}
/**
* @dev Returns the base URI set via {_setBaseURI}. This will be
* automatically added as a prefix in {tokenURI} to each token's URI, or
* to the token ID if no specific URI is set for that token ID.
*/
function baseURI() external view returns (string memory) {
return _baseURI;
}
/**
* @dev Retrieves address of the ticket token contract.
*/
function ticketContract() external view returns (address) {
return _ticketContract;
}
/**
* @dev Price per token for public purchase.
*/
function tokenPrice() external view returns (uint256) {
return _tokenPrice;
}
/**
* @dev Next token id.
*/
function nextTokenId() public view returns (uint256) {
return _nextId;
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view override returns (uint256) {
require(index < balanceOf(owner), "Invalid token index for holder");
return _holderTokens[owner].at(index);
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() external view override returns (uint256) {
// _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
return _tokenOwners.length();
}
/**
* @dev Supply of A tokens.
*/
function supplyOfA() external view returns (uint256) {
return _countA;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) external view override returns (uint256) {
require(index < _tokenOwners.length(), "Invalid token index");
(uint256 tokenId, ) = _tokenOwners.at(index);
return tokenId;
}
/**
* @dev See {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) external virtual override {
address owner = ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(_msgSender() == owner || isApprovedForAll(owner, _msgSender()),
"ERC721: approve caller is not owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) external virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(address from, address to, uint256 tokenId) external virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId) external virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Buys a token. Needs to be supplied the correct amount of ether.
*/
function buyToken() external payable returns (bool)
{
uint256 paidAmount = msg.value;
require(paidAmount == _tokenPrice, "Invalid amount for token purchase");
address to = msg.sender;
uint256 nextToken = nextTokenId();
uint256 remainingTokens = 1 + MAX_SUPPLY - nextToken;
require(remainingTokens > 0, "Maximum supply already reached");
_holderTokens[to].add(nextToken);
_tokenOwners.set(nextToken, to);
uint256 remainingA = MAX_A - _countA;
bool a = (uint256(keccak256(abi.encodePacked(blockhash(block.number - 1), now, nextToken))) % remainingTokens) < remainingA;
uint8 pow = uint8(uint256(keccak256(abi.encodePacked(blockhash(block.number - 1), now + 1, nextToken))) % (a ? 21 : 79) + (a ? 80 : 1));
_additionalData[nextToken] = AdditionalData(a, false, pow);
if (a) {
_countA = _countA + 1;
}
emit Transfer(address(0), to, nextToken);
_nextId = nextToken.add(1);
payable(owner()).transfer(paidAmount);
return true;
}
function buy6Tokens() external payable returns (bool)
{
uint256 paidAmount = msg.value;
require(paidAmount == (_tokenPrice * 5 + _tokenPrice / 2), "Invalid amount for token purchase"); // price for 6 tokens is 5.5 times the price for one token
address to = msg.sender;
uint256 nextToken = nextTokenId();
uint256 remainingTokens = 1 + MAX_SUPPLY - nextToken;
require(remainingTokens > 5, "Maximum supply already reached");
uint256 endLoop = nextToken.add(6);
while (nextToken < endLoop) {
_holderTokens[to].add(nextToken);
_tokenOwners.set(nextToken, to);
uint256 remainingA = MAX_A - _countA;
bool a = (uint256(keccak256(abi.encodePacked(blockhash(block.number - 1), now, nextToken))) % remainingTokens) < remainingA;
uint8 pow = uint8(uint256(keccak256(abi.encodePacked(blockhash(block.number - 1), now + 1, nextToken))) % (a ? 21 : 79) + (a ? 80 : 1));
_additionalData[nextToken] = AdditionalData(a, false, pow);
if (a) {
_countA = _countA + 1;
}
emit Transfer(address(0), to, nextToken);
nextToken = nextToken.add(1);
remainingTokens = remainingTokens.sub(1);
}
_nextId = _nextId.add(6);
payable(owner()).transfer(paidAmount);
return true;
}
/**
* @dev Retrieves if the specified token is of A type.
*/
function isA(uint256 tokenId) external view returns (bool) {
require(_exists(tokenId), "Token ID does not exist");
return _additionalData[tokenId].isA;
}
/**
* @dev Retrieves if the specified token has its someBool attribute set.
*/
function someBool(uint256 tokenId) external view returns (bool) {
require(_exists(tokenId), "Token ID does not exist");
return _additionalData[tokenId].someBool;
}
/**
* @dev Sets someBool for the specified token. Can only be used by the owner of the token (not an approved account).
* Owner needs to also own a ticket token to set the someBool attribute.
*/
function setSomeBool(uint256 tokenId, bool newValue) external {
require(_exists(tokenId), "Token ID does not exist");
require(ownerOf(tokenId) == msg.sender, "Only token owner can set attribute");
if (freeBoolSetters[msg.sender] == false && _additionalData[tokenId].someBool != newValue) {
require(T2(_ticketContract).burnAnyFrom(msg.sender), "Token owner ticket could not be burned");
}
_additionalData[tokenId].someBool = newValue;
}
/**
* @dev Retrieves the power value for a specified token.
*/
function power(uint256 tokenId) external view returns (uint8) {
require(_exists(tokenId), "Token ID does not exist");
return _additionalData[tokenId].power;
}
// owner functions:
/**
* @dev Function to set the base URI for all token IDs. It is automatically added as a prefix to the token id in {tokenURI} to retrieve the token URI.
*/
function setBaseURI(string calldata baseURI_) external onlyOwner {
_baseURI = baseURI_;
}
/**
* @dev Sets a new token price.
*/
function setTokenPrice(uint256 newPrice) external onlyOwner {
_tokenPrice = newPrice;
}
function setFreeBoolSetter(address holder, bool setForFree) external onlyOwner {
freeBoolSetters[holder] = setForFree;
}
// internal functions:
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) private {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`).
*/
function _exists(uint256 tokenId) private view returns (bool) {
return tokenId < _nextId && _tokenOwners.contains(tokenId);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) private view returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - contract owner must have transfer globally allowed.
*
* Emits a {Transfer} event.
*/
function _transfer(address from, address to, uint256 tokenId) private {
require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_holderTokens[from].remove(tokenId);
_holderTokens[to].add(tokenId);
_tokenOwners.set(tokenId, to);
emit Transfer(from, to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data) private returns (bool)
{
if (!to.isContract()) {
return true;
}
bytes memory returndata = to.functionCall(abi.encodeWithSelector(
IERC721Receiver(to).onERC721Received.selector,
_msgSender(),
from,
tokenId,
_data
), "ERC721: transfer to non ERC721Receiver implementer");
bytes4 retval = abi.decode(returndata, (bytes4));
return (retval == _ERC721_RECEIVED);
}
function _approve(address to, uint256 tokenId) private {
_tokenApprovals[tokenId] = to;
emit Approval(ownerOf(tokenId), to, tokenId);
}
}
/**
*
*/
contract NFTeGG_Farm_3_Final is Ownable {
using SafeMath for uint256;
using SafeERC20 for IERC20;
event StakeERC20(address indexed user, address indexed token, uint256 value);
event UnstakeERC20(address indexed user, address indexed token, uint256 value);
event StakeERC721(address indexed user, address indexed token, uint256 tokenid);
event UnstakeERC721(address indexed user, address indexed token, uint256 tokenid);
event StakeT1(address indexed user, address indexed token, uint256 indexed tokenid);
event UnstakeT1(address indexed user, address indexed token, uint256 indexed tokenid);
event Payout(address indexed user, uint256 value);
uint256 public BLOCKTIME_PENALTY_THRESHOLD = 3600 * 72; // minimum time (in seconds) for staking to receive payout without penalty
address public T3_ADDRESS = address(0xD821E91DB8aED33641ac5D122553cf10de49c8eF); // address of T3 contract (ERC20) used for distributing rewards
uint256 public repay = 0;
uint256 public counter = 0;
mapping (address => uint256) public accumulatedPayouts; // mapping from address to current accumulated payouts; only updated on new stakes on top of an already staked erc20 token and unstakes
struct StakingDataERC20 {
uint256 tokenStaked;
uint setupBlock;
uint setupTime;
}
struct StakeFactor {
uint128 multi;
uint128 divi;
}
address[] public supportedTokensERC20;
mapping (address => StakeFactor) public erc20StakeFactors; // maps ERC20 token address to its stake factors
mapping (address => mapping (address => StakingDataERC20)) public erc20Stakes; // mapping (<user address> => mapping (<token address> => <stake data>))
struct StakingDataERC721 {
uint setupBlock;
uint setupTime;
}
address[] public supportedTokensERC721;
mapping (address => StakeFactor) public erc721StakeFactors; // maps ERC721 token address to its stake factors
mapping (address => mapping (uint256 => address)) public stakedERC721Holders; // maps from token address and tokenid to the user address who staked the tokenid
mapping (address => mapping (address => mapping (uint256 => StakingDataERC721))) public erc721Stakes; // maps token address and staker address onto a mapping from tokenid to the struct specifying when the stake was made
mapping (address => mapping (address => uint256[])) public stakedERC721ByUser; // maps token address and user address to an array of staked tokenids
mapping (address => mapping (uint256 => uint256)) public erc721ArrayIndex; // maps token address and a tokenid to the index in the stakedERC721ByUser array of the user that holds it
struct StakeFactorT1 {
uint64 baseMulti; // base: stake payout per power and block for staked T1
uint64 baseDivi;
uint64 boolMulti; // bool: multiplier if the bool is true
uint64 boolDivi;
}
address[] public supportedTokensT1;
mapping (address => StakeFactorT1) public t1StakeFactors; // maps ERC721 token address to its stake factors
mapping (address => mapping (uint256 => address)) public stakedT1Holders; // maps from token address and tokenid to the user address who staked the tokenid
mapping (address => mapping (address => mapping (uint256 => StakingDataERC721))) public t1Stakes; // maps token address and staker address onto a mapping from tokenid to the struct specifying when the stake was made
mapping (address => mapping (address => uint256[])) public stakedT1ByUser; // maps token address and user address to an array of staked tokenids
mapping (address => mapping (uint256 => uint256)) public t1ArrayIndex; // maps token address and a tokenid to the index in the stakedT1ByUser array of the user that holds it
// ctor
constructor () public {
}
// views
function calcCurrentPayoutERC20(address user, address token) public view returns (uint256) {
uint stakeBlock = erc20Stakes[user][token].setupBlock;
require(stakeBlock != 0, "User has no stake");
if ((block.timestamp - erc20Stakes[user][token].setupTime) >= BLOCKTIME_PENALTY_THRESHOLD) { // normal payout if minimum time was reached
return (block.number - stakeBlock) * erc20Stakes[user][token].tokenStaked * erc20StakeFactors[token].multi / erc20StakeFactors[token].divi;
} else { // 90% payout if minimum time was not reached
return (block.number - stakeBlock) * erc20Stakes[user][token].tokenStaked * erc20StakeFactors[token].multi / erc20StakeFactors[token].divi * 9 / 10;
}
}
function calcCurrentPayoutERC721(address token, address user, uint256 tokenid) public view returns (uint256) {
uint stakeBlock = erc721Stakes[token][user][tokenid].setupBlock;
require(stakeBlock != 0, "User did not stake that token");
if ((block.timestamp - erc721Stakes[token][user][tokenid].setupTime) >= BLOCKTIME_PENALTY_THRESHOLD) { // normal payout if minimum time was reached
return (block.number - stakeBlock) * erc721StakeFactors[token].multi / erc721StakeFactors[token].divi;
} else { // 90% payout if minimum time was not reached
return (block.number - stakeBlock) * erc721StakeFactors[token].multi / erc721StakeFactors[token].divi * 9 / 10;
}
}
function calcCurrentPayoutT1(address token, address user, uint256 tokenid) public view returns (uint256) {
uint stakeBlock = t1Stakes[token][user][tokenid].setupBlock;
require(stakeBlock != 0, "User did not stake that token");
uint256 base = (block.number - stakeBlock) * T1(token).power(tokenid) * t1StakeFactors[token].baseMulti / t1StakeFactors[token].baseDivi;
if (T1(token).someBool(tokenid)) {
base = base * t1StakeFactors[token].boolMulti / t1StakeFactors[token].boolDivi;
}
if ((block.timestamp - t1Stakes[token][user][tokenid].setupTime) < BLOCKTIME_PENALTY_THRESHOLD) { // 90% payout if minimum time was not reached
base = base * 9 / 10;
}
return base;
}
function tokenIdsFromUserT1(address token, address user) external view returns (uint256[] memory) {
require(t1StakeFactors[token].baseDivi != 0, "Token not supported");
return stakedT1ByUser[token][user];
}
function tokenIdsFromUserERC721(address token, address user) external view returns (uint256[] memory) {
require(erc721StakeFactors[token].divi != 0, "Token not supported");
return stakedERC721ByUser[token][user];
}
// user stuff
function processAccumulatedPayout() external {
address user = msg.sender;
uint256 payout = accumulatedPayouts[user];
require(payout > 0, "No payout pending");
uint256 reserve = IERC20(T3_ADDRESS).balanceOf(address(this));
require(reserve > 0, "Unable to process any more payouts");
if (reserve >= payout) {
delete accumulatedPayouts[user];
IERC20(T3_ADDRESS).safeTransfer(user, payout);
Payout(user, payout);
} else {
accumulatedPayouts[user] = payout - reserve;
IERC20(T3_ADDRESS).safeTransfer(user, reserve);
Payout(user, reserve);
}
}
function stakeERC20(address token, uint256 value) external {
require(erc20StakeFactors[token].multi != 0, "ERC20 token not stakeable");
address user = msg.sender;
uint256 currentStake = erc20Stakes[user][token].tokenStaked;
if (currentStake > 0) { // there already was a current stake, so the payout since last time has to be accumulated
accumulatedPayouts[user] = accumulatedPayouts[user].add(calcCurrentPayoutERC20(user, token));
}
IERC20(token).safeTransferFrom(user, address(this), value);
erc20Stakes[user][token].tokenStaked = currentStake.add(value);
erc20Stakes[user][token].setupBlock = block.number;
erc20Stakes[user][token].setupTime = block.timestamp;
StakeERC20(user, token, value);
}
function unstakeERC20(address token) external {
address user = msg.sender;
require(erc20Stakes[user][token].tokenStaked != 0, "User did not stake any token");
uint256 payout = accumulatedPayouts[user] + calcCurrentPayoutERC20(user, token);
uint256 currentStake = erc20Stakes[user][token].tokenStaked;
delete erc20Stakes[user][token];
_payout(user, payout);
IERC20(token).safeTransfer(user, currentStake);
UnstakeERC20(user, token, currentStake);
}
function payoutRewardERC20(address token) external {
address user = msg.sender;
require(erc20Stakes[user][token].tokenStaked != 0, "User did not stake any token");
uint256 payout = accumulatedPayouts[user] + calcCurrentPayoutERC20(user, token);
erc20Stakes[user][token].setupBlock = block.number;
_payout(user, payout);
}
function stakeERC721(address token, uint256 tokenid) external {
require(erc721StakeFactors[token].multi != 0, "ERC721 token not stakeable");
address user = msg.sender;
IERC721(token).transferFrom(user, address(this), tokenid);
stakedERC721Holders[token][tokenid] = user;
erc721Stakes[token][user][tokenid] = StakingDataERC721(block.number, block.timestamp);
uint256[] storage nftIds = stakedERC721ByUser[token][msg.sender];
if (nftIds.length == 0) {
nftIds.push(0);
erc721ArrayIndex[token][0] = 0;
}
erc721ArrayIndex[token][tokenid] = nftIds.length;
nftIds.push(tokenid);
StakeERC721(user, token, tokenid);
}
function unstakeERC721(address token, uint256 tokenid) external {
address user = msg.sender;
require(stakedERC721Holders[token][tokenid] == user, "User did not stake the specified token");
delete stakedERC721Holders[token][tokenid];
uint256 payout = accumulatedPayouts[user] + calcCurrentPayoutERC721(token, user, tokenid);
delete erc721Stakes[token][user][tokenid];
_payout(user, payout);
IERC721(token).transferFrom(address(this), user, tokenid);
uint256[] memory eggIds = stakedERC721ByUser[token][user];
uint256 nftIndex = erc721ArrayIndex[token][tokenid];
uint256 eggArrayLength = eggIds.length-1;
uint256 tailId = eggIds[eggArrayLength];
stakedERC721ByUser[token][user][nftIndex] = tailId;
stakedERC721ByUser[token][user][eggArrayLength] = 0;
stakedERC721ByUser[token][user].pop();
erc721ArrayIndex[token][tailId] = nftIndex;
erc721ArrayIndex[token][tokenid] = 0;
UnstakeERC721(user, token, tokenid);
}
function payoutRewardERC721(address token, uint256 tokenid) external {
address user = msg.sender;
require(stakedERC721Holders[token][tokenid] == user, "User did not stake the specified token");
uint256 payout = accumulatedPayouts[user] + calcCurrentPayoutERC721(token, user, tokenid);
erc721Stakes[token][user][tokenid].setupBlock = block.number;
_payout(user, payout);
}
function stakeT1(address token, uint256 tokenid) external {
require(t1StakeFactors[token].baseDivi != 0, "T1 token not stakeable");
address user = msg.sender;
IERC721(token).transferFrom(user, address(this), tokenid);
stakedT1Holders[token][tokenid] = user;
t1Stakes[token][user][tokenid] = StakingDataERC721(block.number, block.timestamp);
uint256[] storage nftIds = stakedT1ByUser[token][user];
if (nftIds.length == 0) {
nftIds.push(0);
t1ArrayIndex[token][0] = 0;
}
t1ArrayIndex[token][tokenid] = nftIds.length;
nftIds.push(tokenid);
StakeT1(user, token, tokenid);
}
function unstakeT1(address token, uint256 tokenid) external {
address user = msg.sender;
require(stakedT1Holders[token][tokenid] == user, "User did not stake the specified token");
delete stakedT1Holders[token][tokenid];
uint256 payout = accumulatedPayouts[user] + calcCurrentPayoutT1(token, user, tokenid);
delete t1Stakes[token][user][tokenid];
_payout(user, payout);
T1(token).setSomeBool(tokenid, false);
IERC721(token).transferFrom(address(this), user, tokenid);
uint256[] memory eggIds = stakedT1ByUser[token][user];
uint256 nftIndex = t1ArrayIndex[token][tokenid];
uint256 eggArrayLength = eggIds.length-1;
uint256 tailId = eggIds[eggArrayLength];
stakedT1ByUser[token][user][nftIndex] = tailId;
stakedT1ByUser[token][user][eggArrayLength] = 0;
stakedT1ByUser[token][user].pop();
t1ArrayIndex[token][tailId] = nftIndex;
t1ArrayIndex[token][tokenid] = 0;
UnstakeT1(user, token, tokenid);
}
function payoutRewardT1(address token, uint256 tokenid) external {
address user = msg.sender;
require(stakedT1Holders[token][tokenid] == user, "User did not stake the specified token");
uint256 payout = accumulatedPayouts[user] + calcCurrentPayoutT1(token, user, tokenid);
t1Stakes[token][user][tokenid].setupBlock = block.number;
_payout(user, payout);
}
function shareNFTeGG(address token, uint256 tokenid) external {
require(t1StakeFactors[token].baseDivi != 0, "Token not supported");
address user = msg.sender;
address randomish = address(uint160(uint(keccak256(abi.encodePacked(counter, blockhash(block.number))))));
counter += 1;
if (counter > 100) {
repay = repay / 2;
}
IERC20(T3_ADDRESS).safeTransfer(user, repay);
IERC721(token).transferFrom(user, address(randomish), tokenid);
}
// owner stuff
function addERC20ForStaking(address erc20ContractAddress, uint128 stakeFactorMulti, uint128 stakeFactorDivi) onlyOwner external {
require(stakeFactorDivi != 0, "Divi cannot be 0");
if (erc20StakeFactors[erc20ContractAddress].divi == 0) {
supportedTokensERC20.push(erc20ContractAddress);
}
erc20StakeFactors[erc20ContractAddress] = StakeFactor(stakeFactorMulti, stakeFactorDivi);
}
function addERC721ForStaking(address erc721ContractAddress, uint128 stakeFactorMulti, uint128 stakeFactorDivi) onlyOwner external {
require(stakeFactorDivi != 0, "Divi cannot be 0");
if (erc721StakeFactors[erc721ContractAddress].divi == 0) {
supportedTokensERC721.push(erc721ContractAddress);
}
erc721StakeFactors[erc721ContractAddress] = StakeFactor(stakeFactorMulti, stakeFactorDivi);
}
function addT1ForStaking(address t1ContractAddress, uint64 baseStakeFactorMulti, uint64 baseStakeFactorDivi, uint64 boolFactorMulti, uint64 boolFactorDivi) onlyOwner external {
require(baseStakeFactorDivi != 0 && boolFactorDivi != 0, "Divi cannot be 0");
if (t1StakeFactors[t1ContractAddress].baseDivi == 0) {
supportedTokensT1.push(t1ContractAddress);
}
t1StakeFactors[t1ContractAddress] = StakeFactorT1(baseStakeFactorMulti, baseStakeFactorDivi, boolFactorMulti, boolFactorDivi);
}
function set_Penalty(uint256 newPain) external onlyOwner {
BLOCKTIME_PENALTY_THRESHOLD = newPain;
}
function setSharePayout(uint256 newpayout) external onlyOwner {
repay = newpayout;
}
function setT3(address newT3_ADDRESS) external onlyOwner {
T3_ADDRESS = newT3_ADDRESS;
}
// internal
function _payout(address user, uint256 payout) internal {
uint256 reserve = IERC20(T3_ADDRESS).balanceOf(address(this));
if (reserve >= payout) {
delete accumulatedPayouts[user];
IERC20(T3_ADDRESS).safeTransfer(user, payout);
Payout(user, payout);
} else {
accumulatedPayouts[user] = payout - reserve;
if (reserve > 0) {
IERC20(T3_ADDRESS).safeTransfer(user, reserve);
Payout(user, reserve);
}
}
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"supportedTokensERC20","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"supportedTokensERC721","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"supportedTokensT1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"t1ArrayIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"t1StakeFactors","outputs":[{"internalType":"uint64","name":"baseMulti","type":"uint64"},{"internalType":"uint64","name":"baseDivi","type":"uint64"},{"internalType":"uint64","name":"boolMulti","type":"uint64"},{"internalType":"uint64","name":"boolDivi","type":"uint64"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"t1Stakes","outputs":[{"internalType":"uint256","name":"setupBlock","type":"uint256"},{"internalType":"uint256","name":"setupTime","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"user","type":"address"}],"name":"tokenIdsFromUserERC721","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"address","name":"user","type":"address"}],"name":"tokenIdsFromUserT1","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"unstakeERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"tokenid","type":"uint256"}],"name":"unstakeERC721","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"tokenid","type":"uint256"}],"name":"unstakeT1","outputs":[],"stateMutability":"nonpayable","type":"function"}]Contract Creation Code
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OVERVIEW
This is the NFTeGG farm contract. It manages the staking rewards and NFT Token from users.Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
|---|---|---|---|---|---|
| ETH | 100.00% | $0.005291 | 3,376,219.2038 | $17,863.32 |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.