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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../utils/Context.sol"; | |
/** | |
* @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. | |
*/ | |
abstract 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() { | |
_setOwner(_msgSender()); | |
} | |
/** | |
* @dev Returns the address of the current owner. | |
*/ | |
function owner() public view virtual 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 { | |
_setOwner(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"); | |
_setOwner(newOwner); | |
} | |
function _setOwner(address newOwner) private { | |
address oldOwner = _owner; | |
_owner = newOwner; | |
emit OwnershipTransferred(oldOwner, newOwner); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../utils/Address.sol"; | |
import "../utils/Context.sol"; | |
import "../utils/math/SafeMath.sol"; | |
/** | |
* @title PaymentSplitter | |
* @dev This contract allows to split Ether payments among a group of accounts. The sender does not need to be aware | |
* that the Ether will be split in this way, since it is handled transparently by the contract. | |
* | |
* The split can be in equal parts or in any other arbitrary proportion. The way this is specified is by assigning each | |
* account to a number of shares. Of all the Ether that this contract receives, each account will then be able to claim | |
* an amount proportional to the percentage of total shares they were assigned. | |
* | |
* `PaymentSplitter` follows a _pull payment_ model. This means that payments are not automatically forwarded to the | |
* accounts but kept in this contract, and the actual transfer is triggered as a separate step by calling the {release} | |
* function. | |
*/ | |
contract PaymentSplitter is Context { | |
event PayeeAdded(address account, uint256 shares); | |
event PaymentReleased(address to, uint256 amount); | |
event PaymentReceived(address from, uint256 amount); | |
uint256 private _totalShares; | |
uint256 private _totalReleased; | |
mapping(address => uint256) private _shares; | |
mapping(address => uint256) private _released; | |
address[] private _payees; | |
/** | |
* @dev Creates an instance of `PaymentSplitter` where each account in `payees` is assigned the number of shares at | |
* the matching position in the `shares` array. | |
* | |
* All addresses in `payees` must be non-zero. Both arrays must have the same non-zero length, and there must be no | |
* duplicates in `payees`. | |
*/ | |
constructor(address[] memory payees, uint256[] memory shares_) payable { | |
require(payees.length == shares_.length, "PaymentSplitter: payees and shares length mismatch"); | |
require(payees.length > 0, "PaymentSplitter: no payees"); | |
for (uint256 i = 0; i < payees.length; i++) { | |
_addPayee(payees[i], shares_[i]); | |
} | |
} | |
/** | |
* @dev The Ether received will be logged with {PaymentReceived} events. Note that these events are not fully | |
* reliable: it's possible for a contract to receive Ether without triggering this function. This only affects the | |
* reliability of the events, and not the actual splitting of Ether. | |
* | |
* To learn more about this see the Solidity documentation for | |
* https://solidity.readthedocs.io/en/latest/contracts.html#fallback-function[fallback | |
* functions]. | |
*/ | |
receive() external payable virtual { | |
emit PaymentReceived(_msgSender(), msg.value); | |
} | |
/** | |
* @dev Getter for the total shares held by payees. | |
*/ | |
function totalShares() public view returns (uint256) { | |
return _totalShares; | |
} | |
/** | |
* @dev Getter for the total amount of Ether already released. | |
*/ | |
function totalReleased() public view returns (uint256) { | |
return _totalReleased; | |
} | |
/** | |
* @dev Getter for the amount of shares held by an account. | |
*/ | |
function shares(address account) public view returns (uint256) { | |
return _shares[account]; | |
} | |
/** | |
* @dev Getter for the amount of Ether already released to a payee. | |
*/ | |
function released(address account) public view returns (uint256) { | |
return _released[account]; | |
} | |
/** | |
* @dev Getter for the address of the payee number `index`. | |
*/ | |
function payee(uint256 index) public view returns (address) { | |
return _payees[index]; | |
} | |
/** | |
* @dev Triggers a transfer to `account` of the amount of Ether they are owed, according to their percentage of the | |
* total shares and their previous withdrawals. | |
*/ | |
function release(address payable account) public virtual { | |
require(_shares[account] > 0, "PaymentSplitter: account has no shares"); | |
uint256 totalReceived = address(this).balance + _totalReleased; | |
uint256 payment = (totalReceived * _shares[account]) / _totalShares - _released[account]; | |
require(payment != 0, "PaymentSplitter: account is not due payment"); | |
_released[account] = _released[account] + payment; | |
_totalReleased = _totalReleased + payment; | |
Address.sendValue(account, payment); | |
emit PaymentReleased(account, payment); | |
} | |
/** | |
* @dev Add a new payee to the contract. | |
* @param account The address of the payee to add. | |
* @param shares_ The number of shares owned by the payee. | |
*/ | |
function _addPayee(address account, uint256 shares_) private { | |
require(account != address(0), "PaymentSplitter: account is the zero address"); | |
require(shares_ > 0, "PaymentSplitter: shares are 0"); | |
require(_shares[account] == 0, "PaymentSplitter: account already has shares"); | |
_payees.push(account); | |
_shares[account] = shares_; | |
_totalShares = _totalShares + shares_; | |
emit PayeeAdded(account, shares_); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../utils/Context.sol"; | |
/** | |
* @dev Contract module which allows children to implement an emergency stop | |
* mechanism that can be triggered by an authorized account. | |
* | |
* This module is used through inheritance. It will make available the | |
* modifiers `whenNotPaused` and `whenPaused`, which can be applied to | |
* the functions of your contract. Note that they will not be pausable by | |
* simply including this module, only once the modifiers are put in place. | |
*/ | |
abstract contract Pausable is Context { | |
/** | |
* @dev Emitted when the pause is triggered by `account`. | |
*/ | |
event Paused(address account); | |
/** | |
* @dev Emitted when the pause is lifted by `account`. | |
*/ | |
event Unpaused(address account); | |
bool private _paused; | |
/** | |
* @dev Initializes the contract in unpaused state. | |
*/ | |
constructor() { | |
_paused = false; | |
} | |
/** | |
* @dev Returns true if the contract is paused, and false otherwise. | |
*/ | |
function paused() public view virtual returns (bool) { | |
return _paused; | |
} | |
/** | |
* @dev Modifier to make a function callable only when the contract is not paused. | |
* | |
* Requirements: | |
* | |
* - The contract must not be paused. | |
*/ | |
modifier whenNotPaused() { | |
require(!paused(), "Pausable: paused"); | |
_; | |
} | |
/** | |
* @dev Modifier to make a function callable only when the contract is paused. | |
* | |
* Requirements: | |
* | |
* - The contract must be paused. | |
*/ | |
modifier whenPaused() { | |
require(paused(), "Pausable: not paused"); | |
_; | |
} | |
/** | |
* @dev Triggers stopped state. | |
* | |
* Requirements: | |
* | |
* - The contract must not be paused. | |
*/ | |
function _pause() internal virtual whenNotPaused { | |
_paused = true; | |
emit Paused(_msgSender()); | |
} | |
/** | |
* @dev Returns to normal state. | |
* | |
* Requirements: | |
* | |
* - The contract must be paused. | |
*/ | |
function _unpause() internal virtual whenPaused { | |
_paused = false; | |
emit Unpaused(_msgSender()); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../utils/escrow/Escrow.sol"; | |
/** | |
* @dev Simple implementation of a | |
* https://consensys.github.io/smart-contract-best-practices/recommendations/#favor-pull-over-push-for-external-calls[pull-payment] | |
* strategy, where the paying contract doesn't interact directly with the | |
* receiver account, which must withdraw its payments itself. | |
* | |
* Pull-payments are often considered the best practice when it comes to sending | |
* Ether, security-wise. It prevents recipients from blocking execution, and | |
* eliminates reentrancy concerns. | |
* | |
* TIP: If you would like to learn more about reentrancy and alternative ways | |
* to protect against it, check out our blog post | |
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. | |
* | |
* To use, derive from the `PullPayment` contract, and use {_asyncTransfer} | |
* instead of Solidity's `transfer` function. Payees can query their due | |
* payments with {payments}, and retrieve them with {withdrawPayments}. | |
*/ | |
abstract contract PullPayment { | |
Escrow private immutable _escrow; | |
constructor() { | |
_escrow = new Escrow(); | |
} | |
/** | |
* @dev Withdraw accumulated payments, forwarding all gas to the recipient. | |
* | |
* Note that _any_ account can call this function, not just the `payee`. | |
* This means that contracts unaware of the `PullPayment` protocol can still | |
* receive funds this way, by having a separate account call | |
* {withdrawPayments}. | |
* | |
* WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities. | |
* Make sure you trust the recipient, or are either following the | |
* checks-effects-interactions pattern or using {ReentrancyGuard}. | |
* | |
* @param payee Whose payments will be withdrawn. | |
*/ | |
function withdrawPayments(address payable payee) public virtual { | |
_escrow.withdraw(payee); | |
} | |
/** | |
* @dev Returns the payments owed to an address. | |
* @param dest The creditor's address. | |
*/ | |
function payments(address dest) public view returns (uint256) { | |
return _escrow.depositsOf(dest); | |
} | |
/** | |
* @dev Called by the payer to store the sent amount as credit to be pulled. | |
* Funds sent in this way are stored in an intermediate {Escrow} contract, so | |
* there is no danger of them being spent before withdrawal. | |
* | |
* @param dest The destination address of the funds. | |
* @param amount The amount to transfer. | |
*/ | |
function _asyncTransfer(address dest, uint256 amount) internal virtual { | |
_escrow.deposit{value: amount}(dest); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @dev Contract module that helps prevent reentrant calls to a function. | |
* | |
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier | |
* available, which can be applied to functions to make sure there are no nested | |
* (reentrant) calls to them. | |
* | |
* Note that because there is a single `nonReentrant` guard, functions marked as | |
* `nonReentrant` may not call one another. This can be worked around by making | |
* those functions `private`, and then adding `external` `nonReentrant` entry | |
* points to them. | |
* | |
* TIP: If you would like to learn more about reentrancy and alternative ways | |
* to protect against it, check out our blog post | |
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. | |
*/ | |
abstract contract ReentrancyGuard { | |
// Booleans are more expensive than uint256 or any type that takes up a full | |
// word because each write operation emits an extra SLOAD to first read the | |
// slot's contents, replace the bits taken up by the boolean, and then write | |
// back. This is the compiler's defense against contract upgrades and | |
// pointer aliasing, and it cannot be disabled. | |
// The values being non-zero value makes deployment a bit more expensive, | |
// but in exchange the refund on every call to nonReentrant will be lower in | |
// amount. Since refunds are capped to a percentage of the total | |
// transaction's gas, it is best to keep them low in cases like this one, to | |
// increase the likelihood of the full refund coming into effect. | |
uint256 private constant _NOT_ENTERED = 1; | |
uint256 private constant _ENTERED = 2; | |
uint256 private _status; | |
constructor() { | |
_status = _NOT_ENTERED; | |
} | |
/** | |
* @dev Prevents a contract from calling itself, directly or indirectly. | |
* Calling a `nonReentrant` function from another `nonReentrant` | |
* function is not supported. It is possible to prevent this from happening | |
* by making the `nonReentrant` function external, and make it call a | |
* `private` function that does the actual work. | |
*/ | |
modifier nonReentrant() { | |
// On the first call to nonReentrant, _notEntered will be true | |
require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); | |
// Any calls to nonReentrant after this point will fail | |
_status = _ENTERED; | |
_; | |
// By storing the original value once again, a refund is triggered (see | |
// https://eips.ethereum.org/EIPS/eip-2200) | |
_status = _NOT_ENTERED; | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "./IERC20.sol"; | |
import "./extensions/IERC20Metadata.sol"; | |
import "../../utils/Context.sol"; | |
/** | |
* @dev Implementation of the {IERC20} interface. | |
* | |
* This implementation is agnostic to the way tokens are created. This means | |
* that a supply mechanism has to be added in a derived contract using {_mint}. | |
* For a generic mechanism see {ERC20PresetMinterPauser}. | |
* | |
* TIP: For a detailed writeup see our guide | |
* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How | |
* to implement supply mechanisms]. | |
* | |
* We have followed general OpenZeppelin Contracts guidelines: functions revert | |
* instead returning `false` on failure. This behavior is nonetheless | |
* conventional and does not conflict with the expectations of ERC20 | |
* applications. | |
* | |
* Additionally, an {Approval} event is emitted on calls to {transferFrom}. | |
* This allows applications to reconstruct the allowance for all accounts just | |
* by listening to said events. Other implementations of the EIP may not emit | |
* these events, as it isn't required by the specification. | |
* | |
* Finally, the non-standard {decreaseAllowance} and {increaseAllowance} | |
* functions have been added to mitigate the well-known issues around setting | |
* allowances. See {IERC20-approve}. | |
*/ | |
contract ERC20 is Context, IERC20, IERC20Metadata { | |
mapping(address => uint256) private _balances; | |
mapping(address => mapping(address => uint256)) private _allowances; | |
uint256 private _totalSupply; | |
string private _name; | |
string private _symbol; | |
/** | |
* @dev Sets the values for {name} and {symbol}. | |
* | |
* The default value of {decimals} is 18. To select a different value for | |
* {decimals} you should overload it. | |
* | |
* All two of these values are immutable: they can only be set once during | |
* construction. | |
*/ | |
constructor(string memory name_, string memory symbol_) { | |
_name = name_; | |
_symbol = symbol_; | |
} | |
/** | |
* @dev Returns the name of the token. | |
*/ | |
function name() public view virtual override returns (string memory) { | |
return _name; | |
} | |
/** | |
* @dev Returns the symbol of the token, usually a shorter version of the | |
* name. | |
*/ | |
function symbol() public view virtual override returns (string memory) { | |
return _symbol; | |
} | |
/** | |
* @dev Returns the number of decimals used to get its user representation. | |
* For example, if `decimals` equals `2`, a balance of `505` tokens should | |
* be displayed to a user as `5.05` (`505 / 10 ** 2`). | |
* | |
* Tokens usually opt for a value of 18, imitating the relationship between | |
* Ether and Wei. This is the value {ERC20} uses, unless this function is | |
* overridden; | |
* | |
* NOTE: This information is only used for _display_ purposes: it in | |
* no way affects any of the arithmetic of the contract, including | |
* {IERC20-balanceOf} and {IERC20-transfer}. | |
*/ | |
function decimals() public view virtual override returns (uint8) { | |
return 18; | |
} | |
/** | |
* @dev See {IERC20-totalSupply}. | |
*/ | |
function totalSupply() public view virtual override returns (uint256) { | |
return _totalSupply; | |
} | |
/** | |
* @dev See {IERC20-balanceOf}. | |
*/ | |
function balanceOf(address account) public view virtual override returns (uint256) { | |
return _balances[account]; | |
} | |
/** | |
* @dev See {IERC20-transfer}. | |
* | |
* Requirements: | |
* | |
* - `recipient` cannot be the zero address. | |
* - the caller must have a balance of at least `amount`. | |
*/ | |
function transfer(address recipient, uint256 amount) public virtual override returns (bool) { | |
_transfer(_msgSender(), recipient, amount); | |
return true; | |
} | |
/** | |
* @dev See {IERC20-allowance}. | |
*/ | |
function allowance(address owner, address spender) public view virtual override returns (uint256) { | |
return _allowances[owner][spender]; | |
} | |
/** | |
* @dev See {IERC20-approve}. | |
* | |
* Requirements: | |
* | |
* - `spender` cannot be the zero address. | |
*/ | |
function approve(address spender, uint256 amount) public virtual override returns (bool) { | |
_approve(_msgSender(), spender, amount); | |
return true; | |
} | |
/** | |
* @dev See {IERC20-transferFrom}. | |
* | |
* Emits an {Approval} event indicating the updated allowance. This is not | |
* required by the EIP. See the note at the beginning of {ERC20}. | |
* | |
* Requirements: | |
* | |
* - `sender` and `recipient` cannot be the zero address. | |
* - `sender` must have a balance of at least `amount`. | |
* - the caller must have allowance for ``sender``'s tokens of at least | |
* `amount`. | |
*/ | |
function transferFrom( | |
address sender, | |
address recipient, | |
uint256 amount | |
) public virtual override returns (bool) { | |
_transfer(sender, recipient, amount); | |
uint256 currentAllowance = _allowances[sender][_msgSender()]; | |
require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); | |
unchecked { | |
_approve(sender, _msgSender(), currentAllowance - amount); | |
} | |
return true; | |
} | |
/** | |
* @dev Atomically increases the allowance granted to `spender` by the caller. | |
* | |
* This is an alternative to {approve} that can be used as a mitigation for | |
* problems described in {IERC20-approve}. | |
* | |
* Emits an {Approval} event indicating the updated allowance. | |
* | |
* Requirements: | |
* | |
* - `spender` cannot be the zero address. | |
*/ | |
function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { | |
_approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue); | |
return true; | |
} | |
/** | |
* @dev Atomically decreases the allowance granted to `spender` by the caller. | |
* | |
* This is an alternative to {approve} that can be used as a mitigation for | |
* problems described in {IERC20-approve}. | |
* | |
* Emits an {Approval} event indicating the updated allowance. | |
* | |
* Requirements: | |
* | |
* - `spender` cannot be the zero address. | |
* - `spender` must have allowance for the caller of at least | |
* `subtractedValue`. | |
*/ | |
function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { | |
uint256 currentAllowance = _allowances[_msgSender()][spender]; | |
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); | |
unchecked { | |
_approve(_msgSender(), spender, currentAllowance - subtractedValue); | |
} | |
return true; | |
} | |
/** | |
* @dev Moves `amount` of tokens from `sender` to `recipient`. | |
* | |
* This internal function is equivalent to {transfer}, and can be used to | |
* e.g. implement automatic token fees, slashing mechanisms, etc. | |
* | |
* Emits a {Transfer} event. | |
* | |
* Requirements: | |
* | |
* - `sender` cannot be the zero address. | |
* - `recipient` cannot be the zero address. | |
* - `sender` must have a balance of at least `amount`. | |
*/ | |
function _transfer( | |
address sender, | |
address recipient, | |
uint256 amount | |
) internal virtual { | |
require(sender != address(0), "ERC20: transfer from the zero address"); | |
require(recipient != address(0), "ERC20: transfer to the zero address"); | |
_beforeTokenTransfer(sender, recipient, amount); | |
uint256 senderBalance = _balances[sender]; | |
require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); | |
unchecked { | |
_balances[sender] = senderBalance - amount; | |
} | |
_balances[recipient] += amount; | |
emit Transfer(sender, recipient, amount); | |
_afterTokenTransfer(sender, recipient, amount); | |
} | |
/** @dev Creates `amount` tokens and assigns them to `account`, increasing | |
* the total supply. | |
* | |
* Emits a {Transfer} event with `from` set to the zero address. | |
* | |
* Requirements: | |
* | |
* - `account` cannot be the zero address. | |
*/ | |
function _mint(address account, uint256 amount) internal virtual { | |
require(account != address(0), "ERC20: mint to the zero address"); | |
_beforeTokenTransfer(address(0), account, amount); | |
_totalSupply += amount; | |
_balances[account] += amount; | |
emit Transfer(address(0), account, amount); | |
_afterTokenTransfer(address(0), account, amount); | |
} | |
/** | |
* @dev Destroys `amount` tokens from `account`, reducing the | |
* total supply. | |
* | |
* Emits a {Transfer} event with `to` set to the zero address. | |
* | |
* Requirements: | |
* | |
* - `account` cannot be the zero address. | |
* - `account` must have at least `amount` tokens. | |
*/ | |
function _burn(address account, uint256 amount) internal virtual { | |
require(account != address(0), "ERC20: burn from the zero address"); | |
_beforeTokenTransfer(account, address(0), amount); | |
uint256 accountBalance = _balances[account]; | |
require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); | |
unchecked { | |
_balances[account] = accountBalance - amount; | |
} | |
_totalSupply -= amount; | |
emit Transfer(account, address(0), amount); | |
_afterTokenTransfer(account, address(0), amount); | |
} | |
/** | |
* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. | |
* | |
* This internal function is equivalent to `approve`, and can be used to | |
* e.g. set automatic allowances for certain subsystems, etc. | |
* | |
* Emits an {Approval} event. | |
* | |
* Requirements: | |
* | |
* - `owner` cannot be the zero address. | |
* - `spender` cannot be the zero address. | |
*/ | |
function _approve( | |
address owner, | |
address spender, | |
uint256 amount | |
) internal virtual { | |
require(owner != address(0), "ERC20: approve from the zero address"); | |
require(spender != address(0), "ERC20: approve to the zero address"); | |
_allowances[owner][spender] = amount; | |
emit Approval(owner, spender, amount); | |
} | |
/** | |
* @dev Hook that is called before any transfer of tokens. This includes | |
* minting and burning. | |
* | |
* Calling conditions: | |
* | |
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens | |
* will be transferred to `to`. | |
* - when `from` is zero, `amount` tokens will be minted for `to`. | |
* - when `to` is zero, `amount` of ``from``'s tokens will be burned. | |
* - `from` and `to` are never both zero. | |
* | |
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. | |
*/ | |
function _beforeTokenTransfer( | |
address from, | |
address to, | |
uint256 amount | |
) internal virtual {} | |
/** | |
* @dev Hook that is called after any transfer of tokens. This includes | |
* minting and burning. | |
* | |
* Calling conditions: | |
* | |
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens | |
* has been transferred to `to`. | |
* - when `from` is zero, `amount` tokens have been minted for `to`. | |
* - when `to` is zero, `amount` of ``from``'s tokens have been burned. | |
* - `from` and `to` are never both zero. | |
* | |
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. | |
*/ | |
function _afterTokenTransfer( | |
address from, | |
address to, | |
uint256 amount | |
) internal virtual {} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../ERC20.sol"; | |
import "../../../utils/Context.sol"; | |
/** | |
* @dev Extension of {ERC20} that allows token holders to destroy both their own | |
* tokens and those that they have an allowance for, in a way that can be | |
* recognized off-chain (via event analysis). | |
*/ | |
abstract contract ERC20Burnable is Context, ERC20 { | |
/** | |
* @dev Destroys `amount` tokens from the caller. | |
* | |
* See {ERC20-_burn}. | |
*/ | |
function burn(uint256 amount) public virtual { | |
_burn(_msgSender(), amount); | |
} | |
/** | |
* @dev Destroys `amount` tokens from `account`, deducting from the caller's | |
* allowance. | |
* | |
* See {ERC20-_burn} and {ERC20-allowance}. | |
* | |
* Requirements: | |
* | |
* - the caller must have allowance for ``accounts``'s tokens of at least | |
* `amount`. | |
*/ | |
function burnFrom(address account, uint256 amount) public virtual { | |
uint256 currentAllowance = allowance(account, _msgSender()); | |
require(currentAllowance >= amount, "ERC20: burn amount exceeds allowance"); | |
unchecked { | |
_approve(account, _msgSender(), currentAllowance - amount); | |
} | |
_burn(account, amount); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../IERC20.sol"; | |
/** | |
* @dev Interface for the optional metadata functions from the ERC20 standard. | |
* | |
* _Available since v4.1._ | |
*/ | |
interface IERC20Metadata is IERC20 { | |
/** | |
* @dev Returns the name of the token. | |
*/ | |
function name() external view returns (string memory); | |
/** | |
* @dev Returns the symbol of the token. | |
*/ | |
function symbol() external view returns (string memory); | |
/** | |
* @dev Returns the decimals places of the token. | |
*/ | |
function decimals() external view returns (uint8); | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @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); | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "./IERC721.sol"; | |
import "./IERC721Receiver.sol"; | |
import "./extensions/IERC721Metadata.sol"; | |
import "../../utils/Address.sol"; | |
import "../../utils/Context.sol"; | |
import "../../utils/Strings.sol"; | |
import "../../utils/introspection/ERC165.sol"; | |
/** | |
* @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including | |
* the Metadata extension, but not including the Enumerable extension, which is available separately as | |
* {ERC721Enumerable}. | |
*/ | |
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata { | |
using Address for address; | |
using Strings for uint256; | |
// Token name | |
string private _name; | |
// Token symbol | |
string private _symbol; | |
// Mapping from token ID to owner address | |
mapping(uint256 => address) private _owners; | |
// Mapping owner address to token count | |
mapping(address => uint256) private _balances; | |
// 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; | |
/** | |
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection. | |
*/ | |
constructor(string memory name_, string memory symbol_) { | |
_name = name_; | |
_symbol = symbol_; | |
} | |
/** | |
* @dev See {IERC165-supportsInterface}. | |
*/ | |
function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) { | |
return | |
interfaceId == type(IERC721).interfaceId || | |
interfaceId == type(IERC721Metadata).interfaceId || | |
super.supportsInterface(interfaceId); | |
} | |
/** | |
* @dev See {IERC721-balanceOf}. | |
*/ | |
function balanceOf(address owner) public view virtual override returns (uint256) { | |
require(owner != address(0), "ERC721: balance query for the zero address"); | |
return _balances[owner]; | |
} | |
/** | |
* @dev See {IERC721-ownerOf}. | |
*/ | |
function ownerOf(uint256 tokenId) public view virtual override returns (address) { | |
address owner = _owners[tokenId]; | |
require(owner != address(0), "ERC721: owner query for nonexistent token"); | |
return owner; | |
} | |
/** | |
* @dev See {IERC721Metadata-name}. | |
*/ | |
function name() public view virtual override returns (string memory) { | |
return _name; | |
} | |
/** | |
* @dev See {IERC721Metadata-symbol}. | |
*/ | |
function symbol() public view virtual override returns (string memory) { | |
return _symbol; | |
} | |
/** | |
* @dev See {IERC721Metadata-tokenURI}. | |
*/ | |
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) { | |
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token"); | |
string memory baseURI = _baseURI(); | |
return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : ""; | |
} | |
/** | |
* @dev Base URI for computing {tokenURI}. If set, the resulting URI for each | |
* token will be the concatenation of the `baseURI` and the `tokenId`. Empty | |
* by default, can be overriden in child contracts. | |
*/ | |
function _baseURI() internal view virtual returns (string memory) { | |
return ""; | |
} | |
/** | |
* @dev See {IERC721-approve}. | |
*/ | |
function approve(address to, uint256 tokenId) public virtual override { | |
address owner = ERC721.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 virtual 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) public 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 virtual override returns (bool) { | |
return _operatorApprovals[owner][operator]; | |
} | |
/** | |
* @dev See {IERC721-transferFrom}. | |
*/ | |
function transferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) public 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 | |
) public 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 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 | |
) internal virtual { | |
_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) internal view virtual returns (bool) { | |
return _owners[tokenId] != address(0); | |
} | |
/** | |
* @dev Returns whether `spender` is allowed to manage `tokenId`. | |
* | |
* Requirements: | |
* | |
* - `tokenId` must exist. | |
*/ | |
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) { | |
require(_exists(tokenId), "ERC721: operator query for nonexistent token"); | |
address owner = ERC721.ownerOf(tokenId); | |
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender)); | |
} | |
/** | |
* @dev Safely mints `tokenId` and transfers it to `to`. | |
* | |
* Requirements: | |
* | |
* - `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) internal virtual { | |
_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 | |
) internal virtual { | |
_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) internal virtual { | |
require(to != address(0), "ERC721: mint to the zero address"); | |
require(!_exists(tokenId), "ERC721: token already minted"); | |
_beforeTokenTransfer(address(0), to, tokenId); | |
_balances[to] += 1; | |
_owners[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 = ERC721.ownerOf(tokenId); | |
_beforeTokenTransfer(owner, address(0), tokenId); | |
// Clear approvals | |
_approve(address(0), tokenId); | |
_balances[owner] -= 1; | |
delete _owners[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`. | |
* | |
* Emits a {Transfer} event. | |
*/ | |
function _transfer( | |
address from, | |
address to, | |
uint256 tokenId | |
) internal virtual { | |
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); | |
require(to != address(0), "ERC721: transfer to the zero address"); | |
_beforeTokenTransfer(from, to, tokenId); | |
// Clear approvals from the previous owner | |
_approve(address(0), tokenId); | |
_balances[from] -= 1; | |
_balances[to] += 1; | |
_owners[tokenId] = to; | |
emit Transfer(from, to, tokenId); | |
} | |
/** | |
* @dev Approve `to` to operate on `tokenId` | |
* | |
* Emits a {Approval} event. | |
*/ | |
function _approve(address to, uint256 tokenId) internal virtual { | |
_tokenApprovals[tokenId] = to; | |
emit Approval(ERC721.ownerOf(tokenId), 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()) { | |
try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) { | |
return retval == IERC721Receiver.onERC721Received.selector; | |
} catch (bytes memory reason) { | |
if (reason.length == 0) { | |
revert("ERC721: transfer to non ERC721Receiver implementer"); | |
} else { | |
assembly { | |
revert(add(32, reason), mload(reason)) | |
} | |
} | |
} | |
} else { | |
return true; | |
} | |
} | |
/** | |
* @dev Hook that is called before any token transfer. This includes minting | |
* and burning. | |
* | |
* Calling conditions: | |
* | |
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be | |
* transferred to `to`. | |
* - When `from` is zero, `tokenId` will be minted for `to`. | |
* - When `to` is zero, ``from``'s `tokenId` will be burned. | |
* - `from` and `to` are never both zero. | |
* | |
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. | |
*/ | |
function _beforeTokenTransfer( | |
address from, | |
address to, | |
uint256 tokenId | |
) internal virtual {} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../ERC721.sol"; | |
import "../../../utils/Context.sol"; | |
/** | |
* @title ERC721 Burnable Token | |
* @dev ERC721 Token that can be irreversibly burned (destroyed). | |
*/ | |
abstract contract ERC721Burnable is Context, ERC721 { | |
/** | |
* @dev Burns `tokenId`. See {ERC721-_burn}. | |
* | |
* Requirements: | |
* | |
* - The caller must own `tokenId` or be an approved operator. | |
*/ | |
function burn(uint256 tokenId) public virtual { | |
//solhint-disable-next-line max-line-length | |
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721Burnable: caller is not owner nor approved"); | |
_burn(tokenId); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../ERC721.sol"; | |
import "./IERC721Enumerable.sol"; | |
/** | |
* @dev This implements an optional extension of {ERC721} defined in the EIP that adds | |
* enumerability of all the token ids in the contract as well as all token ids owned by each | |
* account. | |
*/ | |
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable { | |
// Mapping from owner to list of owned token IDs | |
mapping(address => mapping(uint256 => uint256)) private _ownedTokens; | |
// Mapping from token ID to index of the owner tokens list | |
mapping(uint256 => uint256) private _ownedTokensIndex; | |
// Array with all token ids, used for enumeration | |
uint256[] private _allTokens; | |
// Mapping from token id to position in the allTokens array | |
mapping(uint256 => uint256) private _allTokensIndex; | |
/** | |
* @dev See {IERC165-supportsInterface}. | |
*/ | |
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) { | |
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId); | |
} | |
/** | |
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}. | |
*/ | |
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) { | |
require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds"); | |
return _ownedTokens[owner][index]; | |
} | |
/** | |
* @dev See {IERC721Enumerable-totalSupply}. | |
*/ | |
function totalSupply() public view virtual override returns (uint256) { | |
return _allTokens.length; | |
} | |
/** | |
* @dev See {IERC721Enumerable-tokenByIndex}. | |
*/ | |
function tokenByIndex(uint256 index) public view virtual override returns (uint256) { | |
require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds"); | |
return _allTokens[index]; | |
} | |
/** | |
* @dev Hook that is called before any token transfer. This includes minting | |
* and burning. | |
* | |
* Calling conditions: | |
* | |
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be | |
* transferred to `to`. | |
* - When `from` is zero, `tokenId` will be minted for `to`. | |
* - When `to` is zero, ``from``'s `tokenId` will be burned. | |
* - `from` cannot be the zero address. | |
* - `to` cannot be the zero address. | |
* | |
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. | |
*/ | |
function _beforeTokenTransfer( | |
address from, | |
address to, | |
uint256 tokenId | |
) internal virtual override { | |
super._beforeTokenTransfer(from, to, tokenId); | |
if (from == address(0)) { | |
_addTokenToAllTokensEnumeration(tokenId); | |
} else if (from != to) { | |
_removeTokenFromOwnerEnumeration(from, tokenId); | |
} | |
if (to == address(0)) { | |
_removeTokenFromAllTokensEnumeration(tokenId); | |
} else if (to != from) { | |
_addTokenToOwnerEnumeration(to, tokenId); | |
} | |
} | |
/** | |
* @dev Private function to add a token to this extension's ownership-tracking data structures. | |
* @param to address representing the new owner of the given token ID | |
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address | |
*/ | |
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private { | |
uint256 length = ERC721.balanceOf(to); | |
_ownedTokens[to][length] = tokenId; | |
_ownedTokensIndex[tokenId] = length; | |
} | |
/** | |
* @dev Private function to add a token to this extension's token tracking data structures. | |
* @param tokenId uint256 ID of the token to be added to the tokens list | |
*/ | |
function _addTokenToAllTokensEnumeration(uint256 tokenId) private { | |
_allTokensIndex[tokenId] = _allTokens.length; | |
_allTokens.push(tokenId); | |
} | |
/** | |
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that | |
* while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for | |
* gas optimizations e.g. when performing a transfer operation (avoiding double writes). | |
* This has O(1) time complexity, but alters the order of the _ownedTokens array. | |
* @param from address representing the previous owner of the given token ID | |
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address | |
*/ | |
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private { | |
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and | |
// then delete the last slot (swap and pop). | |
uint256 lastTokenIndex = ERC721.balanceOf(from) - 1; | |
uint256 tokenIndex = _ownedTokensIndex[tokenId]; | |
// When the token to delete is the last token, the swap operation is unnecessary | |
if (tokenIndex != lastTokenIndex) { | |
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex]; | |
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token | |
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index | |
} | |
// This also deletes the contents at the last position of the array | |
delete _ownedTokensIndex[tokenId]; | |
delete _ownedTokens[from][lastTokenIndex]; | |
} | |
/** | |
* @dev Private function to remove a token from this extension's token tracking data structures. | |
* This has O(1) time complexity, but alters the order of the _allTokens array. | |
* @param tokenId uint256 ID of the token to be removed from the tokens list | |
*/ | |
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private { | |
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and | |
// then delete the last slot (swap and pop). | |
uint256 lastTokenIndex = _allTokens.length - 1; | |
uint256 tokenIndex = _allTokensIndex[tokenId]; | |
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so | |
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding | |
// an 'if' statement (like in _removeTokenFromOwnerEnumeration) | |
uint256 lastTokenId = _allTokens[lastTokenIndex]; | |
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token | |
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index | |
// This also deletes the contents at the last position of the array | |
delete _allTokensIndex[tokenId]; | |
_allTokens.pop(); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../IERC721.sol"; | |
/** | |
* @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); | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../IERC721.sol"; | |
/** | |
* @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); | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../../utils/introspection/IERC165.sol"; | |
/** | |
* @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; | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @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); | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @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; | |
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"); | |
(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"); | |
(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"); | |
(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 v3.4._ | |
*/ | |
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 v3.4._ | |
*/ | |
function functionDelegateCall( | |
address target, | |
bytes memory data, | |
string memory errorMessage | |
) internal returns (bytes memory) { | |
require(isContract(target), "Address: delegate call to non-contract"); | |
(bool success, bytes memory returndata) = target.delegatecall(data); | |
return verifyCallResult(success, returndata, errorMessage); | |
} | |
/** | |
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the | |
* revert reason using the provided one. | |
* | |
* _Available since v4.3._ | |
*/ | |
function verifyCallResult( | |
bool success, | |
bytes memory returndata, | |
string memory errorMessage | |
) internal 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 | |
assembly { | |
let returndata_size := mload(returndata) | |
revert(add(32, returndata), returndata_size) | |
} | |
} else { | |
revert(errorMessage); | |
} | |
} | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @dev Provides information about the current execution context, including the | |
* sender of the transaction and its data. While these are generally available | |
* via msg.sender and msg.data, they should not be accessed in such a direct | |
* manner, since when dealing with 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) { | |
return msg.sender; | |
} | |
function _msgData() internal view virtual returns (bytes calldata) { | |
return msg.data; | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @title Counters | |
* @author Matt Condon (@shrugs) | |
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number | |
* of elements in a mapping, issuing ERC721 ids, or counting request ids. | |
* | |
* Include with `using Counters for Counters.Counter;` | |
*/ | |
library Counters { | |
struct Counter { | |
// This variable should never be directly accessed by users of the library: interactions must be restricted to | |
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add | |
// this feature: see https://github.com/ethereum/solidity/issues/4637 | |
uint256 _value; // default: 0 | |
} | |
function current(Counter storage counter) internal view returns (uint256) { | |
return counter._value; | |
} | |
function increment(Counter storage counter) internal { | |
unchecked { | |
counter._value += 1; | |
} | |
} | |
function decrement(Counter storage counter) internal { | |
uint256 value = counter._value; | |
require(value > 0, "Counter: decrement overflow"); | |
unchecked { | |
counter._value = value - 1; | |
} | |
} | |
function reset(Counter storage counter) internal { | |
counter._value = 0; | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "../../access/Ownable.sol"; | |
import "../Address.sol"; | |
/** | |
* @title Escrow | |
* @dev Base escrow contract, holds funds designated for a payee until they | |
* withdraw them. | |
* | |
* Intended usage: This contract (and derived escrow contracts) should be a | |
* standalone contract, that only interacts with the contract that instantiated | |
* it. That way, it is guaranteed that all Ether will be handled according to | |
* the `Escrow` rules, and there is no need to check for payable functions or | |
* transfers in the inheritance tree. The contract that uses the escrow as its | |
* payment method should be its owner, and provide public methods redirecting | |
* to the escrow's deposit and withdraw. | |
*/ | |
contract Escrow is Ownable { | |
using Address for address payable; | |
event Deposited(address indexed payee, uint256 weiAmount); | |
event Withdrawn(address indexed payee, uint256 weiAmount); | |
mapping(address => uint256) private _deposits; | |
function depositsOf(address payee) public view returns (uint256) { | |
return _deposits[payee]; | |
} | |
/** | |
* @dev Stores the sent amount as credit to be withdrawn. | |
* @param payee The destination address of the funds. | |
*/ | |
function deposit(address payee) public payable virtual onlyOwner { | |
uint256 amount = msg.value; | |
_deposits[payee] += amount; | |
emit Deposited(payee, amount); | |
} | |
/** | |
* @dev Withdraw accumulated balance for a payee, forwarding all gas to the | |
* recipient. | |
* | |
* WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities. | |
* Make sure you trust the recipient, or are either following the | |
* checks-effects-interactions pattern or using {ReentrancyGuard}. | |
* | |
* @param payee The address whose funds will be withdrawn and transferred to. | |
*/ | |
function withdraw(address payable payee) public virtual onlyOwner { | |
uint256 payment = _deposits[payee]; | |
_deposits[payee] = 0; | |
payee.sendValue(payment); | |
emit Withdrawn(payee, payment); | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
import "./IERC165.sol"; | |
/** | |
* @dev Implementation of the {IERC165} interface. | |
* | |
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check | |
* for the additional interface id that will be supported. For example: | |
* | |
* ```solidity | |
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { | |
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId); | |
* } | |
* ``` | |
* | |
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation. | |
*/ | |
abstract contract ERC165 is IERC165 { | |
/** | |
* @dev See {IERC165-supportsInterface}. | |
*/ | |
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) { | |
return interfaceId == type(IERC165).interfaceId; | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @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); | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
// CAUTION | |
// This version of SafeMath should only be used with Solidity 0.8 or later, | |
// because it relies on the compiler's built in overflow checks. | |
/** | |
* @dev Wrappers over Solidity's arithmetic operations. | |
* | |
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler | |
* now has built in overflow checking. | |
*/ | |
library SafeMath { | |
/** | |
* @dev Returns the addition of two unsigned integers, with an overflow flag. | |
* | |
* _Available since v3.4._ | |
*/ | |
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
unchecked { | |
uint256 c = a + b; | |
if (c < a) return (false, 0); | |
return (true, c); | |
} | |
} | |
/** | |
* @dev Returns the substraction of two unsigned integers, with an overflow flag. | |
* | |
* _Available since v3.4._ | |
*/ | |
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
unchecked { | |
if (b > a) return (false, 0); | |
return (true, a - b); | |
} | |
} | |
/** | |
* @dev Returns the multiplication of two unsigned integers, with an overflow flag. | |
* | |
* _Available since v3.4._ | |
*/ | |
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
unchecked { | |
// 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 (true, 0); | |
uint256 c = a * b; | |
if (c / a != b) return (false, 0); | |
return (true, c); | |
} | |
} | |
/** | |
* @dev Returns the division of two unsigned integers, with a division by zero flag. | |
* | |
* _Available since v3.4._ | |
*/ | |
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
unchecked { | |
if (b == 0) return (false, 0); | |
return (true, a / b); | |
} | |
} | |
/** | |
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. | |
* | |
* _Available since v3.4._ | |
*/ | |
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { | |
unchecked { | |
if (b == 0) return (false, 0); | |
return (true, a % b); | |
} | |
} | |
/** | |
* @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) { | |
return a + b; | |
} | |
/** | |
* @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 a - b; | |
} | |
/** | |
* @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) { | |
return a * b; | |
} | |
/** | |
* @dev Returns the integer division of two unsigned integers, reverting on | |
* division by zero. The result is rounded towards zero. | |
* | |
* Counterpart to Solidity's `/` operator. | |
* | |
* Requirements: | |
* | |
* - The divisor cannot be zero. | |
*/ | |
function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
return a / b; | |
} | |
/** | |
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | |
* reverting 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 a % b; | |
} | |
/** | |
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on | |
* overflow (when the result is negative). | |
* | |
* CAUTION: This function is deprecated because it requires allocating memory for the error | |
* message unnecessarily. For custom revert reasons use {trySub}. | |
* | |
* Counterpart to Solidity's `-` operator. | |
* | |
* Requirements: | |
* | |
* - Subtraction cannot overflow. | |
*/ | |
function sub( | |
uint256 a, | |
uint256 b, | |
string memory errorMessage | |
) internal pure returns (uint256) { | |
unchecked { | |
require(b <= a, errorMessage); | |
return a - b; | |
} | |
} | |
/** | |
* @dev Returns the integer division of two unsigned integers, reverting 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) { | |
unchecked { | |
require(b > 0, errorMessage); | |
return a / b; | |
} | |
} | |
/** | |
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), | |
* reverting with custom message when dividing by zero. | |
* | |
* CAUTION: This function is deprecated because it requires allocating memory for the error | |
* message unnecessarily. For custom revert reasons use {tryMod}. | |
* | |
* 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) { | |
unchecked { | |
require(b > 0, errorMessage); | |
return a % b; | |
} | |
} | |
} |
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// SPDX-License-Identifier: MIT | |
pragma solidity ^0.8.0; | |
/** | |
* @dev String operations. | |
*/ | |
library Strings { | |
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; | |
/** | |
* @dev Converts a `uint256` to its ASCII `string` decimal 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); | |
while (value != 0) { | |
digits -= 1; | |
buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); | |
value /= 10; | |
} | |
return string(buffer); | |
} | |
/** | |
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. | |
*/ | |
function toHexString(uint256 value) internal pure returns (string memory) { | |
if (value == 0) { | |
return "0x00"; | |
} | |
uint256 temp = value; | |
uint256 length = 0; | |
while (temp != 0) { | |
length++; | |
temp >>= 8; | |
} | |
return toHexString(value, length); | |
} | |
/** | |
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. | |
*/ | |
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { | |
bytes memory buffer = new bytes(2 * length + 2); | |
buffer[0] = "0"; | |
buffer[1] = "x"; | |
for (uint256 i = 2 * length + 1; i > 1; --i) { | |
buffer[i] = _HEX_SYMBOLS[value & 0xf]; | |
value >>= 4; | |
} | |
require(value == 0, "Strings: hex length insufficient"); | |
return string(buffer); | |
} | |
} |
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[core] | |
repositoryformatversion = 0 | |
filemode = false | |
bare = false | |
logallrefupdates = true | |
symlinks = false | |
ignorecase = true |
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ref: refs/heads/main |
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