Skip to content

Instantly share code, notes, and snippets.

@jongan69

jongan69/.deps...npm...@chainlink...contracts...src...v0.8...Chainlink.sol

Created November 14, 2022 22:54
Show Gist options
  • Save jongan69/3d92c95357b6b5d2aa42c3fa9c0a1a85 to your computer and use it in GitHub Desktop.
Save jongan69/3d92c95357b6b5d2aa42c3fa9c0a1a85 to your computer and use it in GitHub Desktop.
Download ZIP
Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.7+commit.e28d00a7.js&optimize=false&runs=200&gist=
Raw
.deps...npm...@openzeppelin...contracts...token...ERC20...ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)
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.openzeppelin.com/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:
*
* - `to` cannot be the zero address.
* - the caller must have a balance of at least `amount`.
*/
function transfer(address to, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_transfer(owner, to, 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}.
*
* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
* `transferFrom`. This is semantically equivalent to an infinite approval.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public virtual override returns (bool) {
address owner = _msgSender();
_approve(owner, 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}.
*
* NOTE: Does not update the allowance if the current allowance
* is the maximum `uint256`.
*
* Requirements:
*
* - `from` and `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
* - the caller must have allowance for ``from``'s tokens of at least
* `amount`.
*/
function transferFrom(
address from,
address to,
uint256 amount
) public virtual override returns (bool) {
address spender = _msgSender();
_spendAllowance(from, spender, amount);
_transfer(from, to, 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) {
address owner = _msgSender();
_approve(owner, spender, allowance(owner, 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) {
address owner = _msgSender();
uint256 currentAllowance = allowance(owner, spender);
require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
unchecked {
_approve(owner, spender, currentAllowance - subtractedValue);
}
return true;
}
/**
* @dev Moves `amount` of tokens from `from` to `to`.
*
* 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:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `from` must have a balance of at least `amount`.
*/
function _transfer(
address from,
address to,
uint256 amount
) internal virtual {
require(from != address(0), "ERC20: transfer from the zero address");
require(to != address(0), "ERC20: transfer to the zero address");
_beforeTokenTransfer(from, to, amount);
uint256 fromBalance = _balances[from];
require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
unchecked {
_balances[from] = fromBalance - amount;
// Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
// decrementing then incrementing.
_balances[to] += amount;
}
emit Transfer(from, to, amount);
_afterTokenTransfer(from, to, 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;
unchecked {
// Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
_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;
// Overflow not possible: amount <= accountBalance <= totalSupply.
_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 Updates `owner` s allowance for `spender` based on spent `amount`.
*
* Does not update the allowance amount in case of infinite allowance.
* Revert if not enough allowance is available.
*
* Might emit an {Approval} event.
*/
function _spendAllowance(
address owner,
address spender,
uint256 amount
) internal virtual {
uint256 currentAllowance = allowance(owner, spender);
if (currentAllowance != type(uint256).max) {
require(currentAllowance >= amount, "ERC20: insufficient allowance");
unchecked {
_approve(owner, spender, currentAllowance - 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 {}
}
Raw
.deps...npm...@openzeppelin...contracts...token...ERC20...extensions...IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
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);
}
Raw
.deps...npm...@openzeppelin...contracts...token...ERC20...IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @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 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 `to`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address to, 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 `from` to `to` 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 from,
address to,
uint256 amount
) external returns (bool);
}
Raw
[email protected]
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
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;
}
}
Raw
.deps...remix-tests...remix_accounts.sol
// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.4.22 <0.9.0;
library TestsAccounts {
function getAccount(uint index) pure public returns (address) {
address[15] memory accounts;
accounts[0] = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4;
accounts[1] = 0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2;
accounts[2] = 0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db;
accounts[3] = 0x78731D3Ca6b7E34aC0F824c42a7cC18A495cabaB;
accounts[4] = 0x617F2E2fD72FD9D5503197092aC168c91465E7f2;
accounts[5] = 0x17F6AD8Ef982297579C203069C1DbfFE4348c372;
accounts[6] = 0x5c6B0f7Bf3E7ce046039Bd8FABdfD3f9F5021678;
accounts[7] = 0x03C6FcED478cBbC9a4FAB34eF9f40767739D1Ff7;
accounts[8] = 0x1aE0EA34a72D944a8C7603FfB3eC30a6669E454C;
accounts[9] = 0x0A098Eda01Ce92ff4A4CCb7A4fFFb5A43EBC70DC;
accounts[10] = 0xCA35b7d915458EF540aDe6068dFe2F44E8fa733c;
accounts[11] = 0x14723A09ACff6D2A60DcdF7aA4AFf308FDDC160C;
accounts[12] = 0x4B0897b0513fdC7C541B6d9D7E929C4e5364D2dB;
accounts[13] = 0x583031D1113aD414F02576BD6afaBfb302140225;
accounts[14] = 0xdD870fA1b7C4700F2BD7f44238821C26f7392148;
return accounts[index];
}
}
Raw
.deps...remix-tests...remix_tests.sol
// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.4.22 <0.9.0;
library Assert {
event AssertionEvent(
bool passed,
string message,
string methodName
);
event AssertionEventUint(
bool passed,
string message,
string methodName,
uint256 returned,
uint256 expected
);
event AssertionEventInt(
bool passed,
string message,
string methodName,
int256 returned,
int256 expected
);
event AssertionEventBool(
bool passed,
string message,
string methodName,
bool returned,
bool expected
);
event AssertionEventAddress(
bool passed,
string message,
string methodName,
address returned,
address expected
);
event AssertionEventBytes32(
bool passed,
string message,
string methodName,
bytes32 returned,
bytes32 expected
);
event AssertionEventString(
bool passed,
string message,
string methodName,
string returned,
string expected
);
event AssertionEventUintInt(
bool passed,
string message,
string methodName,
uint256 returned,
int256 expected
);
event AssertionEventIntUint(
bool passed,
string message,
string methodName,
int256 returned,
uint256 expected
);
function ok(bool a, string memory message) public returns (bool result) {
result = a;
emit AssertionEvent(result, message, "ok");
}
function equal(uint256 a, uint256 b, string memory message) public returns (bool result) {
result = (a == b);
emit AssertionEventUint(result, message, "equal", a, b);
}
function equal(int256 a, int256 b, string memory message) public returns (bool result) {
result = (a == b);
emit AssertionEventInt(result, message, "equal", a, b);
}
function equal(bool a, bool b, string memory message) public returns (bool result) {
result = (a == b);
emit AssertionEventBool(result, message, "equal", a, b);
}
// TODO: only for certain versions of solc
//function equal(fixed a, fixed b, string message) public returns (bool result) {
// result = (a == b);
// emit AssertionEvent(result, message);
//}
// TODO: only for certain versions of solc
//function equal(ufixed a, ufixed b, string message) public returns (bool result) {
// result = (a == b);
// emit AssertionEvent(result, message);
//}
function equal(address a, address b, string memory message) public returns (bool result) {
result = (a == b);
emit AssertionEventAddress(result, message, "equal", a, b);
}
function equal(bytes32 a, bytes32 b, string memory message) public returns (bool result) {
result = (a == b);
emit AssertionEventBytes32(result, message, "equal", a, b);
}
function equal(string memory a, string memory b, string memory message) public returns (bool result) {
result = (keccak256(abi.encodePacked(a)) == keccak256(abi.encodePacked(b)));
emit AssertionEventString(result, message, "equal", a, b);
}
function notEqual(uint256 a, uint256 b, string memory message) public returns (bool result) {
result = (a != b);
emit AssertionEventUint(result, message, "notEqual", a, b);
}
function notEqual(int256 a, int256 b, string memory message) public returns (bool result) {
result = (a != b);
emit AssertionEventInt(result, message, "notEqual", a, b);
}
function notEqual(bool a, bool b, string memory message) public returns (bool result) {
result = (a != b);
emit AssertionEventBool(result, message, "notEqual", a, b);
}
// TODO: only for certain versions of solc
//function notEqual(fixed a, fixed b, string message) public returns (bool result) {
// result = (a != b);
// emit AssertionEvent(result, message);
//}
// TODO: only for certain versions of solc
//function notEqual(ufixed a, ufixed b, string message) public returns (bool result) {
// result = (a != b);
// emit AssertionEvent(result, message);
//}
function notEqual(address a, address b, string memory message) public returns (bool result) {
result = (a != b);
emit AssertionEventAddress(result, message, "notEqual", a, b);
}
function notEqual(bytes32 a, bytes32 b, string memory message) public returns (bool result) {
result = (a != b);
emit AssertionEventBytes32(result, message, "notEqual", a, b);
}
function notEqual(string memory a, string memory b, string memory message) public returns (bool result) {
result = (keccak256(abi.encodePacked(a)) != keccak256(abi.encodePacked(b)));
emit AssertionEventString(result, message, "notEqual", a, b);
}
/*----------------- Greater than --------------------*/
function greaterThan(uint256 a, uint256 b, string memory message) public returns (bool result) {
result = (a > b);
emit AssertionEventUint(result, message, "greaterThan", a, b);
}
function greaterThan(int256 a, int256 b, string memory message) public returns (bool result) {
result = (a > b);
emit AssertionEventInt(result, message, "greaterThan", a, b);
}
// TODO: safely compare between uint and int
function greaterThan(uint256 a, int256 b, string memory message) public returns (bool result) {
if(b < int(0)) {
// int is negative uint "a" always greater
result = true;
} else {
result = (a > uint(b));
}
emit AssertionEventUintInt(result, message, "greaterThan", a, b);
}
function greaterThan(int256 a, uint256 b, string memory message) public returns (bool result) {
if(a < int(0)) {
// int is negative uint "b" always greater
result = false;
} else {
result = (uint(a) > b);
}
emit AssertionEventIntUint(result, message, "greaterThan", a, b);
}
/*----------------- Lesser than --------------------*/
function lesserThan(uint256 a, uint256 b, string memory message) public returns (bool result) {
result = (a < b);
emit AssertionEventUint(result, message, "lesserThan", a, b);
}
function lesserThan(int256 a, int256 b, string memory message) public returns (bool result) {
result = (a < b);
emit AssertionEventInt(result, message, "lesserThan", a, b);
}
// TODO: safely compare between uint and int
function lesserThan(uint256 a, int256 b, string memory message) public returns (bool result) {
if(b < int(0)) {
// int is negative int "b" always lesser
result = false;
} else {
result = (a < uint(b));
}
emit AssertionEventUintInt(result, message, "lesserThan", a, b);
}
function lesserThan(int256 a, uint256 b, string memory message) public returns (bool result) {
if(a < int(0)) {
// int is negative int "a" always lesser
result = true;
} else {
result = (uint(a) < b);
}
emit AssertionEventIntUint(result, message, "lesserThan", a, b);
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment