Contract Source Code:
File 1 of 1 : SODA
// Sources flattened with hardhat v2.6.8 https://hardhat.org
// File contracts/IERC165.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/*
Fully commented standard ERC721 Distilled from OpenZeppelin Docs
Base for Building ERC721 by Martin McConnell
All the utility without the fluff.
*/
interface IERC165 {
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
// File contracts/IERC721.sol
pragma solidity ^0.8.0;
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`.
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;
}
// File contracts/IERC721Receiver.sol
pragma solidity ^0.8.0;
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);
}
// File contracts/IERC721Metadata.sol
pragma solidity ^0.8.0;
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);
}
// File contracts/Context.sol
pragma solidity ^0.8.0;
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// File contracts/Ownable.sol
pragma solidity ^0.8.0;
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);
}
}
// File contracts/Functional.sol
pragma solidity ^0.8.0;
abstract contract Functional {
function toString(uint256 value) internal pure returns (string memory) {
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);
}
bool private _reentryKey = false;
modifier reentryLock {
require(!_reentryKey, "attempt to reenter a locked function");
_reentryKey = true;
_;
_reentryKey = false;
}
}
// File contracts/Address.sol
pragma solidity ^0.8.0;
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);
}
function _verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) private pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// File contracts/ControlledAccess.sol
pragma solidity ^0.8.0;
/* @title ControlledAccess
* @dev The ControlledAccess contract allows function to be restricted to users
* that possess a signed authorization from the owner of the contract. This signed
* message includes the user to give permission to and the contract address to prevent
* reusing the same authorization message on different contract with same owner.
*/
contract ControlledAccess is Ownable {
address public signerAddress;
/*
* @dev Requires msg.sender to have valid access message.
* @param _v ECDSA signature parameter v.
* @param _r ECDSA signature parameters r.
* @param _s ECDSA signature parameters s.
*/
modifier onlyValidAccess(
bytes32 _r,
bytes32 _s,
uint8 _v
) {
require(isValidAccessMessage(msg.sender, _r, _s, _v));
_;
}
function setSignerAddress(address newAddress) external onlyOwner {
signerAddress = newAddress;
}
/*
* @dev Verifies if message was signed by owner to give access to _add for this contract.
* Assumes Geth signature prefix.
* @param _add Address of agent with access
* @param _v ECDSA signature parameter v.
* @param _r ECDSA signature parameters r.
* @param _s ECDSA signature parameters s.
* @return Validity of access message for a given address.
*/
function isValidAccessMessage(
address _add,
bytes32 _r,
bytes32 _s,
uint8 _v
) public view returns (bool) {
bytes32 hash = keccak256(abi.encode(owner(), _add));
bytes32 message = keccak256(
abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)
);
address sig = ecrecover(message, _v, _r, _s);
require(signerAddress == sig, "Signature does not match");
return signerAddress == sig;
}
}
// File contracts/SODA.sol
// ******************************************************************************************************************************
// ************************************************** Start of Main Contract ***************************************************
// ******************************************************************************************************************************
pragma solidity ^0.8.0;
contract SODA is IERC721, Ownable, Functional, ControlledAccess {
using Address for address;
// Token name
string private _name;
// Token symbol
string private _symbol;
// URI Root Location for Json Files
string private _baseURI;
// Provenance hash proving random distribution
string public provenanceHash;
// 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;
// Specific Functionality
bool public mintActive;
bool public presaleActive;
uint256 public price;
uint256 public totalTokens;
uint256 public numberMinted;
uint256 public maxPerWallet;
uint256 public maxPerTx;
uint256 public reservedTokens;
uint256 public startingIndex;
uint256 public startingIndexBlock;
mapping(address => uint256) private _tokensMintedby;
/**
* @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
*/
constructor() {
_name = "Society of Derivative Apes";
_symbol = "SODA";
mintActive = false;
presaleActive = false;
totalTokens = 9999; // 0-9998
price = 0.04 ether;
maxPerWallet = 6;
maxPerTx = 3;
reservedTokens = 100; // reserved for giveaways and such
}
//@dev See {IERC165-supportsInterface}. Interfaces Supported by this Standard
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC721).interfaceId ||
interfaceId == type(IERC721Metadata).interfaceId ||
interfaceId == type(IERC165).interfaceId ||
interfaceId == SODA.onERC721Received.selector;
}
// Standard Withdraw function for the owner to pull the contract
function withdraw() external onlyOwner {
uint256 sendAmount = address(this).balance;
address founders = payable(0x62F9ACbD11350FB05B3215507dD1f6e05ed27aF5);
address liam = payable(0x3C31abE4b91c9e8bD39fB505CD98c59fc78cD8E6);
address drew = payable(0x30A8Bac5AED69b9fF46d4fC04A48388cDe5D3A59);
address yeti = payable(0xDF808192A2cb234e276eEF4551228e422a5b6B1A);
address community = payable(0x9fcDD9A89C0a5F8933659077b0Caf2c1EF20ac21);
bool success;
(success, ) = founders.call{value: ((sendAmount * 51)/100)}("");
require(success, "Transaction Unsuccessful");
(success, ) = liam.call{value: ((sendAmount * 13)/100)}("");
require(success, "Transaction Unsuccessful");
(success, ) = drew.call{value: ((sendAmount * 13)/100)}("");
require(success, "Transaction Unsuccessful");
(success, ) = yeti.call{value: ((sendAmount * 13)/100)}("");
require(success, "Transaction Unsuccessful");
(success, ) = community.call{value: ((sendAmount * 10)/100)}("");
require(success, "Transaction Unsuccessful");
}
function airDrop(address[] memory _to) external onlyOwner {
uint256 qty = _to.length;
require((numberMinted + qty) > numberMinted, "Math overflow error");
require((numberMinted + qty) < totalTokens, "Cannot fill order");
uint256 mintSeedValue = numberMinted;
if (reservedTokens >= qty) {
reservedTokens -= qty;
} else {
reservedTokens = 0;
}
for(uint256 i = 0; i < qty; i++) {
_safeMint(_to[i], mintSeedValue + i);
numberMinted ++; //reservedTokens can be reset, numberMinted can not
}
}
function mint(uint256 qty) external payable reentryLock {
require(mintActive);
require((qty + reservedTokens + numberMinted) < totalTokens, "Mint: Not enough availability");
require(qty <= maxPerTx, "Mint: Max tokens per transaction exceeded");
require((_tokensMintedby[_msgSender()] + qty) <= maxPerWallet, "Mint: Max tokens per wallet exceeded");
require(msg.value >= qty * price, "Mint: Insufficient Funds");
uint256 mintSeedValue = numberMinted; //Store the starting value of the mint batch
//Handle ETH transactions
uint256 cashIn = msg.value;
uint256 cashChange = cashIn - (qty * price);
//send tokens
for(uint256 i = 0; i < qty; i++) {
_safeMint(_msgSender(), mintSeedValue + i);
numberMinted ++;
_tokensMintedby[_msgSender()] ++;
}
if (cashChange > 0){
(bool success, ) = msg.sender.call{value: cashChange}("");
require(success, "Mint: unable to send change to user");
}
}
function presaleMint(uint256 qty,
bytes32 _r,
bytes32 _s,
uint8 _v
) external payable onlyValidAccess(_r, _s, _v) reentryLock {
require(presaleActive);
require((_tokensMintedby[_msgSender()] + qty) <= maxPerTx, "Presale Mint: Max tokens during presale exceeded");
require((qty + reservedTokens + numberMinted) < totalTokens, "Mint: Not enough availability");
require(msg.value >= qty * price, "Mint: Insufficient Funds");
uint256 mintSeedValue = numberMinted; //Store the starting value of the mint batch
//Handle ETH transactions
uint256 cashIn = msg.value;
uint256 cashChange = cashIn - (qty * price);
//send tokens
for(uint256 i = 0; i < qty; i++) {
_safeMint(_msgSender(), mintSeedValue + i);
numberMinted ++;
_tokensMintedby[_msgSender()] ++;
}
if (cashChange > 0){
(bool success, ) = msg.sender.call{value: cashChange}("");
require(success, "Mint: unable to send change to user");
}
}
// allows holders to burn their own tokens if desired
/*
function burn(uint256 tokenID) external {
require(_msgSender() == ownerOf(tokenID));
_burn(tokenID);
}
*/
//////////////////////////////////////////////////////////////
//////////////////// Setters and Getters /////////////////////
//////////////////////////////////////////////////////////////
function setMaxPerWallet(uint256 maxWallet) external onlyOwner {
maxPerWallet = maxWallet;
}
function setMaxPerTx(uint256 newMax) external onlyOwner {
maxPerTx = newMax;
}
function setBaseURI(string memory newURI) public onlyOwner {
_baseURI = newURI;
}
function activateMint() public onlyOwner {
mintActive = true;
}
function activatePresale() public onlyOwner {
presaleActive = true;
}
function deactivateMint() public onlyOwner {
mintActive = false;
}
function deactivatePresale() public onlyOwner {
presaleActive = false;
}
function setPrice(uint256 newPrice) public onlyOwner {
price = newPrice;
}
function setTotalTokens(uint256 numTokens) public onlyOwner {
totalTokens = numTokens;
}
function totalSupply() external view returns (uint256) {
return numberMinted;
}
function getBalance(address tokenAddress) view external returns (uint256) {
return _balances[tokenAddress];
}
/**
* @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 {IERC721-approve}.
*/
function approve(address to, uint256 tokenId) public virtual override {
address owner = ownerOf(tokenId);
require(to != owner, "ERC721: approval to current owner");
require(
msg.sender == owner || isApprovedForAll(owner, msg.sender),
"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 != msg.sender, "ERC721: approve to caller");
_operatorApprovals[msg.sender][operator] = approved;
emit ApprovalForAll(msg.sender, 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(msg.sender, 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(msg.sender, 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 = 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 = 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(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(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(msg.sender, from, tokenId, _data) returns (bytes4 retval) {
return retval == IERC721Receiver(to).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;
}
}
// *********************** ERC721 Token Receiver **********************
/**
* @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) {
//InterfaceID=0x150b7a02
return this.onERC721Received.selector;
}
/**
* @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 {}
// **************************************** Metadata Standard Functions **********
//@dev Returns the token collection name.
function name() external view returns (string memory){
return _name;
}
//@dev Returns the token collection symbol.
function symbol() external view returns (string memory){
return _symbol;
}
//@dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
function tokenURI(uint256 tokenId) external view returns (string memory){
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
return string(abi.encodePacked(_baseURI, toString(tokenId), ".json")); /// 0.json 135.json
}
function contractURI() public view returns (string memory) {
return string(abi.encodePacked(_baseURI,"contract.json"));
}
function setProvenanceHash(string calldata hash) public onlyOwner {
provenanceHash = hash;
}
/**
* Set the starting index for the collection
*/
function setStartingIndex() public onlyOwner {
require(startingIndex == 0, "Starting index is already set");
require(startingIndexBlock != 0, "Starting index block must be set");
startingIndex = uint256(blockhash(startingIndexBlock)) % totalTokens;
// Just a sanity case in the worst case if this function is called late (EVM only stores last 256 block hashes)
if (block.number % startingIndexBlock > 255) {
startingIndex = uint256(blockhash(block.number - 1)) % totalTokens;
}
// Prevent default sequence
if (startingIndex == 0) {
startingIndex = startingIndex + 1;
}
}
/**
* Set the starting index block for the collection, essentially unblocking
* setting starting index
*/
function setStartingIndexBlock() public onlyOwner {
require(startingIndex == 0, "Starting index is already set");
startingIndexBlock = block.number;
}
receive() external payable {}
fallback() external payable {}
}