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johanpham2711/[email protected]@4.9.3...access...Ownable.sol

Created September 25, 2023 14:03
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  1. johanpham2711 created this gist Sep 25, 2023.
    83 changes: 83 additions & 0 deletions [email protected]@4.9.3...access...Ownable.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

    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() {
    _transferOwnership(_msgSender());
    }

    /**
    * @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner() {
    _checkOwner();
    _;
    }

    /**
    * @dev Returns the address of the current owner.
    */
    function owner() public view virtual returns (address) {
    return _owner;
    }

    /**
    * @dev Throws if the sender is not the owner.
    */
    function _checkOwner() internal view virtual {
    require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
    * @dev Leaves the contract without owner. It will not be possible to call
    * `onlyOwner` functions. Can only be called by the current owner.
    *
    * NOTE: Renouncing ownership will leave the contract without an owner,
    * thereby disabling any functionality that is only available to the owner.
    */
    function renounceOwnership() public virtual onlyOwner {
    _transferOwnership(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");
    _transferOwnership(newOwner);
    }

    /**
    * @dev Transfers ownership of the contract to a new account (`newOwner`).
    * Internal function without access restriction.
    */
    function _transferOwnership(address newOwner) internal virtual {
    address oldOwner = _owner;
    _owner = newOwner;
    emit OwnershipTransferred(oldOwner, newOwner);
    }
    }
    105 changes: 105 additions & 0 deletions [email protected]@4.9.3...security...Pausable.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.7.0) (security/Pausable.sol)

    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 Modifier to make a function callable only when the contract is not paused.
    *
    * Requirements:
    *
    * - The contract must not be paused.
    */
    modifier whenNotPaused() {
    _requireNotPaused();
    _;
    }

    /**
    * @dev Modifier to make a function callable only when the contract is paused.
    *
    * Requirements:
    *
    * - The contract must be paused.
    */
    modifier whenPaused() {
    _requirePaused();
    _;
    }

    /**
    * @dev Returns true if the contract is paused, and false otherwise.
    */
    function paused() public view virtual returns (bool) {
    return _paused;
    }

    /**
    * @dev Throws if the contract is paused.
    */
    function _requireNotPaused() internal view virtual {
    require(!paused(), "Pausable: paused");
    }

    /**
    * @dev Throws if the contract is not paused.
    */
    function _requirePaused() internal view virtual {
    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());
    }
    }
    466 changes: 466 additions & 0 deletions [email protected]@4.9.3...token...ERC721...ERC721.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/ERC721.sol)

    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: address zero is not a valid owner");
    return _balances[owner];
    }

    /**
    * @dev See {IERC721-ownerOf}.
    */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
    address owner = _ownerOf(tokenId);
    require(owner != address(0), "ERC721: invalid token ID");
    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) {
    _requireMinted(tokenId);

    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 overridden 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 token owner or approved for all"
    );

    _approve(to, tokenId);
    }

    /**
    * @dev See {IERC721-getApproved}.
    */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
    _requireMinted(tokenId);

    return _tokenApprovals[tokenId];
    }

    /**
    * @dev See {IERC721-setApprovalForAll}.
    */
    function setApprovalForAll(address operator, bool approved) public virtual override {
    _setApprovalForAll(_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: caller is not token owner or 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: caller is not token owner or 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 the owner of the `tokenId`. Does NOT revert if token doesn't exist
    */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
    return _owners[tokenId];
    }

    /**
    * @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 _ownerOf(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) {
    address owner = ERC721.ownerOf(tokenId);
    return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == 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, 1);

    // Check that tokenId was not minted by `_beforeTokenTransfer` hook
    require(!_exists(tokenId), "ERC721: token already minted");

    unchecked {
    // Will not overflow unless all 2**256 token ids are minted to the same owner.
    // Given that tokens are minted one by one, it is impossible in practice that
    // this ever happens. Might change if we allow batch minting.
    // The ERC fails to describe this case.
    _balances[to] += 1;
    }

    _owners[tokenId] = to;

    emit Transfer(address(0), to, tokenId);

    _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
    * @dev Destroys `tokenId`.
    * The approval is cleared when the token is burned.
    * This is an internal function that does not check if the sender is authorized to operate on the token.
    *
    * Requirements:
    *
    * - `tokenId` must exist.
    *
    * Emits a {Transfer} event.
    */
    function _burn(uint256 tokenId) internal virtual {
    address owner = ERC721.ownerOf(tokenId);

    _beforeTokenTransfer(owner, address(0), tokenId, 1);

    // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
    owner = ERC721.ownerOf(tokenId);

    // Clear approvals
    delete _tokenApprovals[tokenId];

    unchecked {
    // Cannot overflow, as that would require more tokens to be burned/transferred
    // out than the owner initially received through minting and transferring in.
    _balances[owner] -= 1;
    }
    delete _owners[tokenId];

    emit Transfer(owner, address(0), tokenId);

    _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
    * @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 from incorrect owner");
    require(to != address(0), "ERC721: transfer to the zero address");

    _beforeTokenTransfer(from, to, tokenId, 1);

    // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
    require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

    // Clear approvals from the previous owner
    delete _tokenApprovals[tokenId];

    unchecked {
    // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
    // `from`'s balance is the number of token held, which is at least one before the current
    // transfer.
    // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
    // all 2**256 token ids to be minted, which in practice is impossible.
    _balances[from] -= 1;
    _balances[to] += 1;
    }
    _owners[tokenId] = to;

    emit Transfer(from, to, tokenId);

    _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
    * @dev Approve `to` to operate on `tokenId`
    *
    * Emits an {Approval} event.
    */
    function _approve(address to, uint256 tokenId) internal virtual {
    _tokenApprovals[tokenId] = to;
    emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
    * @dev Approve `operator` to operate on all of `owner` tokens
    *
    * Emits an {ApprovalForAll} event.
    */
    function _setApprovalForAll(address owner, address operator, bool approved) internal virtual {
    require(owner != operator, "ERC721: approve to caller");
    _operatorApprovals[owner][operator] = approved;
    emit ApprovalForAll(owner, operator, approved);
    }

    /**
    * @dev Reverts if the `tokenId` has not been minted yet.
    */
    function _requireMinted(uint256 tokenId) internal view virtual {
    require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
    * @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 {
    /// @solidity memory-safe-assembly
    assembly {
    revert(add(32, reason), mload(reason))
    }
    }
    }
    } else {
    return true;
    }
    }

    /**
    * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
    * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
    *
    * Calling conditions:
    *
    * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
    * - When `from` is zero, the tokens will be minted for `to`.
    * - When `to` is zero, ``from``'s tokens will be burned.
    * - `from` and `to` are never both zero.
    * - `batchSize` is non-zero.
    *
    * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
    */
    function _beforeTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
    * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
    * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
    *
    * Calling conditions:
    *
    * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
    * - When `from` is zero, the tokens were minted for `to`.
    * - When `to` is zero, ``from``'s tokens were burned.
    * - `from` and `to` are never both zero.
    * - `batchSize` is non-zero.
    *
    * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
    */
    function _afterTokenTransfer(address from, address to, uint256 firstTokenId, uint256 batchSize) internal virtual {}

    /**
    * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
    *
    * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
    * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
    * that `ownerOf(tokenId)` is `a`.
    */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
    _balances[account] += amount;
    }
    }
    132 changes: 132 additions & 0 deletions [email protected]@4.9.3...token...ERC721...IERC721.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.9.0) (token/ERC721/IERC721.sol)

    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`.
    *
    * 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;

    /**
    * @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 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: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
    * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
    * understand this adds an external call which potentially creates a reentrancy vulnerability.
    *
    * 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 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 the account approved for `tokenId` token.
    *
    * Requirements:
    *
    * - `tokenId` must exist.
    */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
    * @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);
    }
    27 changes: 27 additions & 0 deletions [email protected]@4.9.3...token...ERC721...IERC721Receiver.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

    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 `IERC721Receiver.onERC721Received.selector`.
    */
    function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes calldata data
    ) external returns (bytes4);
    }
    159 changes: 159 additions & 0 deletions [email protected]@4.9.3...token...ERC721...extensions...ERC721Enumerable.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol)

    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 See {ERC721-_beforeTokenTransfer}.
    */
    function _beforeTokenTransfer(
    address from,
    address to,
    uint256 firstTokenId,
    uint256 batchSize
    ) internal virtual override {
    super._beforeTokenTransfer(from, to, firstTokenId, batchSize);

    if (batchSize > 1) {
    // Will only trigger during construction. Batch transferring (minting) is not available afterwards.
    revert("ERC721Enumerable: consecutive transfers not supported");
    }

    uint256 tokenId = firstTokenId;

    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();
    }
    }
    29 changes: 29 additions & 0 deletions [email protected]@4.9.3...token...ERC721...extensions...IERC721Enumerable.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

    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);

    /**
    * @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);
    }
    27 changes: 27 additions & 0 deletions [email protected]@4.9.3...token...ERC721...extensions...IERC721Metadata.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

    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);
    }
    244 changes: 244 additions & 0 deletions [email protected]@4.9.3...utils...Address.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

    pragma solidity ^0.8.1;

    /**
    * @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
    *
    * Furthermore, `isContract` will also return true if the target contract within
    * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
    * which only has an effect at the end of a transaction.
    * ====
    *
    * [IMPORTANT]
    * ====
    * You shouldn't rely on `isContract` to protect against flash loan attacks!
    *
    * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
    * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
    * constructor.
    * ====
    */
    function isContract(address account) internal view returns (bool) {
    // This method relies on extcodesize/address.code.length, which returns 0
    // for contracts in construction, since the code is only stored at the end
    // of the constructor execution.

    return account.code.length > 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://consensys.net/diligence/blog/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/v0.8.0/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 functionCallWithValue(target, data, 0, "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");
    (bool success, bytes memory returndata) = target.call{value: value}(data);
    return verifyCallResultFromTarget(target, 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) {
    (bool success, bytes memory returndata) = target.staticcall(data);
    return verifyCallResultFromTarget(target, 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) {
    (bool success, bytes memory returndata) = target.delegatecall(data);
    return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
    * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
    * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
    *
    * _Available since v4.8._
    */
    function verifyCallResultFromTarget(
    address target,
    bool success,
    bytes memory returndata,
    string memory errorMessage
    ) internal view returns (bytes memory) {
    if (success) {
    if (returndata.length == 0) {
    // only check isContract if the call was successful and the return data is empty
    // otherwise we already know that it was a contract
    require(isContract(target), "Address: call to non-contract");
    }
    return returndata;
    } else {
    _revert(returndata, errorMessage);
    }
    }

    /**
    * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
    * revert reason or 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 {
    _revert(returndata, errorMessage);
    }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
    // 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
    /// @solidity memory-safe-assembly
    assembly {
    let returndata_size := mload(returndata)
    revert(add(32, returndata), returndata_size)
    }
    } else {
    revert(errorMessage);
    }
    }
    }
    24 changes: 24 additions & 0 deletions [email protected]@4.9.3...utils...Context.sol
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    // 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;
    }
    }
    43 changes: 43 additions & 0 deletions [email protected]@4.9.3...utils...Counters.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

    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;
    }
    }
    85 changes: 85 additions & 0 deletions [email protected]@4.9.3...utils...Strings.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

    pragma solidity ^0.8.0;

    import "./math/Math.sol";
    import "./math/SignedMath.sol";

    /**
    * @dev String operations.
    */
    library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
    * @dev Converts a `uint256` to its ASCII `string` decimal representation.
    */
    function toString(uint256 value) internal pure returns (string memory) {
    unchecked {
    uint256 length = Math.log10(value) + 1;
    string memory buffer = new string(length);
    uint256 ptr;
    /// @solidity memory-safe-assembly
    assembly {
    ptr := add(buffer, add(32, length))
    }
    while (true) {
    ptr--;
    /// @solidity memory-safe-assembly
    assembly {
    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
    }
    value /= 10;
    if (value == 0) break;
    }
    return buffer;
    }
    }

    /**
    * @dev Converts a `int256` to its ASCII `string` decimal representation.
    */
    function toString(int256 value) internal pure returns (string memory) {
    return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
    * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
    */
    function toHexString(uint256 value) internal pure returns (string memory) {
    unchecked {
    return toHexString(value, Math.log256(value) + 1);
    }
    }

    /**
    * @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] = _SYMBOLS[value & 0xf];
    value >>= 4;
    }
    require(value == 0, "Strings: hex length insufficient");
    return string(buffer);
    }

    /**
    * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
    */
    function toHexString(address addr) internal pure returns (string memory) {
    return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
    * @dev Returns true if the two strings are equal.
    */
    function equal(string memory a, string memory b) internal pure returns (bool) {
    return keccak256(bytes(a)) == keccak256(bytes(b));
    }
    }
    29 changes: 29 additions & 0 deletions [email protected]@4.9.3...utils...introspection...ERC165.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

    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;
    }
    }
    25 changes: 25 additions & 0 deletions [email protected]@4.9.3...utils...introspection...IERC165.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

    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);
    }
    339 changes: 339 additions & 0 deletions [email protected]@4.9.3...utils...math...Math.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

    pragma solidity ^0.8.0;

    /**
    * @dev Standard math utilities missing in the Solidity language.
    */
    library Math {
    enum Rounding {
    Down, // Toward negative infinity
    Up, // Toward infinity
    Zero // Toward zero
    }

    /**
    * @dev Returns the largest of two numbers.
    */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
    return a > b ? a : b;
    }

    /**
    * @dev Returns the smallest of two numbers.
    */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
    return a < b ? a : b;
    }

    /**
    * @dev Returns the average of two numbers. The result is rounded towards
    * zero.
    */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
    // (a + b) / 2 can overflow.
    return (a & b) + (a ^ b) / 2;
    }

    /**
    * @dev Returns the ceiling of the division of two numbers.
    *
    * This differs from standard division with `/` in that it rounds up instead
    * of rounding down.
    */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
    // (a + b - 1) / b can overflow on addition, so we distribute.
    return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
    * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
    * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
    * with further edits by Uniswap Labs also under MIT license.
    */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
    unchecked {
    // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
    // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
    // variables such that product = prod1 * 2^256 + prod0.
    uint256 prod0; // Least significant 256 bits of the product
    uint256 prod1; // Most significant 256 bits of the product
    assembly {
    let mm := mulmod(x, y, not(0))
    prod0 := mul(x, y)
    prod1 := sub(sub(mm, prod0), lt(mm, prod0))
    }

    // Handle non-overflow cases, 256 by 256 division.
    if (prod1 == 0) {
    // Solidity will revert if denominator == 0, unlike the div opcode on its own.
    // The surrounding unchecked block does not change this fact.
    // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
    return prod0 / denominator;
    }

    // Make sure the result is less than 2^256. Also prevents denominator == 0.
    require(denominator > prod1, "Math: mulDiv overflow");

    ///////////////////////////////////////////////
    // 512 by 256 division.
    ///////////////////////////////////////////////

    // Make division exact by subtracting the remainder from [prod1 prod0].
    uint256 remainder;
    assembly {
    // Compute remainder using mulmod.
    remainder := mulmod(x, y, denominator)

    // Subtract 256 bit number from 512 bit number.
    prod1 := sub(prod1, gt(remainder, prod0))
    prod0 := sub(prod0, remainder)
    }

    // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
    // See https://cs.stackexchange.com/q/138556/92363.

    // Does not overflow because the denominator cannot be zero at this stage in the function.
    uint256 twos = denominator & (~denominator + 1);
    assembly {
    // Divide denominator by twos.
    denominator := div(denominator, twos)

    // Divide [prod1 prod0] by twos.
    prod0 := div(prod0, twos)

    // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
    twos := add(div(sub(0, twos), twos), 1)
    }

    // Shift in bits from prod1 into prod0.
    prod0 |= prod1 * twos;

    // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
    // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
    // four bits. That is, denominator * inv = 1 mod 2^4.
    uint256 inverse = (3 * denominator) ^ 2;

    // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
    // in modular arithmetic, doubling the correct bits in each step.
    inverse *= 2 - denominator * inverse; // inverse mod 2^8
    inverse *= 2 - denominator * inverse; // inverse mod 2^16
    inverse *= 2 - denominator * inverse; // inverse mod 2^32
    inverse *= 2 - denominator * inverse; // inverse mod 2^64
    inverse *= 2 - denominator * inverse; // inverse mod 2^128
    inverse *= 2 - denominator * inverse; // inverse mod 2^256

    // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
    // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
    // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
    // is no longer required.
    result = prod0 * inverse;
    return result;
    }
    }

    /**
    * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
    */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
    uint256 result = mulDiv(x, y, denominator);
    if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
    result += 1;
    }
    return result;
    }

    /**
    * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
    *
    * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
    */
    function sqrt(uint256 a) internal pure returns (uint256) {
    if (a == 0) {
    return 0;
    }

    // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
    //
    // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
    // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
    //
    // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
    // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
    // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
    //
    // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
    uint256 result = 1 << (log2(a) >> 1);

    // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
    // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
    // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
    // into the expected uint128 result.
    unchecked {
    result = (result + a / result) >> 1;
    result = (result + a / result) >> 1;
    result = (result + a / result) >> 1;
    result = (result + a / result) >> 1;
    result = (result + a / result) >> 1;
    result = (result + a / result) >> 1;
    result = (result + a / result) >> 1;
    return min(result, a / result);
    }
    }

    /**
    * @notice Calculates sqrt(a), following the selected rounding direction.
    */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
    unchecked {
    uint256 result = sqrt(a);
    return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
    }
    }

    /**
    * @dev Return the log in base 2, rounded down, of a positive value.
    * Returns 0 if given 0.
    */
    function log2(uint256 value) internal pure returns (uint256) {
    uint256 result = 0;
    unchecked {
    if (value >> 128 > 0) {
    value >>= 128;
    result += 128;
    }
    if (value >> 64 > 0) {
    value >>= 64;
    result += 64;
    }
    if (value >> 32 > 0) {
    value >>= 32;
    result += 32;
    }
    if (value >> 16 > 0) {
    value >>= 16;
    result += 16;
    }
    if (value >> 8 > 0) {
    value >>= 8;
    result += 8;
    }
    if (value >> 4 > 0) {
    value >>= 4;
    result += 4;
    }
    if (value >> 2 > 0) {
    value >>= 2;
    result += 2;
    }
    if (value >> 1 > 0) {
    result += 1;
    }
    }
    return result;
    }

    /**
    * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
    * Returns 0 if given 0.
    */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
    unchecked {
    uint256 result = log2(value);
    return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
    }
    }

    /**
    * @dev Return the log in base 10, rounded down, of a positive value.
    * Returns 0 if given 0.
    */
    function log10(uint256 value) internal pure returns (uint256) {
    uint256 result = 0;
    unchecked {
    if (value >= 10 ** 64) {
    value /= 10 ** 64;
    result += 64;
    }
    if (value >= 10 ** 32) {
    value /= 10 ** 32;
    result += 32;
    }
    if (value >= 10 ** 16) {
    value /= 10 ** 16;
    result += 16;
    }
    if (value >= 10 ** 8) {
    value /= 10 ** 8;
    result += 8;
    }
    if (value >= 10 ** 4) {
    value /= 10 ** 4;
    result += 4;
    }
    if (value >= 10 ** 2) {
    value /= 10 ** 2;
    result += 2;
    }
    if (value >= 10 ** 1) {
    result += 1;
    }
    }
    return result;
    }

    /**
    * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
    * Returns 0 if given 0.
    */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
    unchecked {
    uint256 result = log10(value);
    return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
    }
    }

    /**
    * @dev Return the log in base 256, rounded down, of a positive value.
    * Returns 0 if given 0.
    *
    * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
    */
    function log256(uint256 value) internal pure returns (uint256) {
    uint256 result = 0;
    unchecked {
    if (value >> 128 > 0) {
    value >>= 128;
    result += 16;
    }
    if (value >> 64 > 0) {
    value >>= 64;
    result += 8;
    }
    if (value >> 32 > 0) {
    value >>= 32;
    result += 4;
    }
    if (value >> 16 > 0) {
    value >>= 16;
    result += 2;
    }
    if (value >> 8 > 0) {
    result += 1;
    }
    }
    return result;
    }

    /**
    * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
    * Returns 0 if given 0.
    */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
    unchecked {
    uint256 result = log256(value);
    return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
    }
    }
    }
    43 changes: 43 additions & 0 deletions [email protected]@4.9.3...utils...math...SignedMath.sol
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    // SPDX-License-Identifier: MIT
    // OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

    pragma solidity ^0.8.0;

    /**
    * @dev Standard signed math utilities missing in the Solidity language.
    */
    library SignedMath {
    /**
    * @dev Returns the largest of two signed numbers.
    */
    function max(int256 a, int256 b) internal pure returns (int256) {
    return a > b ? a : b;
    }

    /**
    * @dev Returns the smallest of two signed numbers.
    */
    function min(int256 a, int256 b) internal pure returns (int256) {
    return a < b ? a : b;
    }

    /**
    * @dev Returns the average of two signed numbers without overflow.
    * The result is rounded towards zero.
    */
    function average(int256 a, int256 b) internal pure returns (int256) {
    // Formula from the book "Hacker's Delight"
    int256 x = (a & b) + ((a ^ b) >> 1);
    return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
    * @dev Returns the absolute unsigned value of a signed value.
    */
    function abs(int256 n) internal pure returns (uint256) {
    unchecked {
    // must be unchecked in order to support `n = type(int256).min`
    return uint256(n >= 0 ? n : -n);
    }
    }
    }
    9 changes: 9 additions & 0 deletions .deps...remix-tests...remix_accounts.sol
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    // SPDX-License-Identifier: GPL-3.0

    pragma solidity >=0.4.22 <0.9.0;

    library TestsAccounts {
    function getAccount(uint index) pure public returns (address) {
    return address(0);
    }
    }
    225 changes: 225 additions & 0 deletions .deps...remix-tests...remix_tests.sol
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    // 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);
    }
    }
    53 changes: 53 additions & 0 deletions contract-1ca8ad4b06.sol
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    // SPDX-License-Identifier: MIT
    pragma solidity ^0.8.9;

    import "@openzeppelin/[email protected]/token/ERC721/ERC721.sol";
    import "@openzeppelin/[email protected]/token/ERC721/extensions/ERC721Enumerable.sol";
    import "@openzeppelin/[email protected]/security/Pausable.sol";
    import "@openzeppelin/[email protected]/access/Ownable.sol";
    import "@openzeppelin/[email protected]/utils/Counters.sol";

    contract JohanToken is ERC721, ERC721Enumerable, Pausable, Ownable {
    using Counters for Counters.Counter;

    Counters.Counter private _tokenIdCounter;

    constructor() ERC721("JohanToken", "JT") {}

    function _baseURI() internal pure override returns (string memory) {
    return "ipfs://johanTokenBaseURI";
    }

    function pause() public onlyOwner {
    _pause();
    }

    function unpause() public onlyOwner {
    _unpause();
    }

    function safeMint(address to) public onlyOwner {
    uint256 tokenId = _tokenIdCounter.current();
    _tokenIdCounter.increment();
    _safeMint(to, tokenId);
    }

    function _beforeTokenTransfer(address from, address to, uint256 tokenId, uint256 batchSize)
    internal
    whenNotPaused
    override(ERC721, ERC721Enumerable)
    {
    super._beforeTokenTransfer(from, to, tokenId, batchSize);
    }

    // The following functions are overrides required by Solidity.

    function supportsInterface(bytes4 interfaceId)
    public
    view
    override(ERC721, ERC721Enumerable)
    returns (bool)
    {
    return super.supportsInterface(interfaceId);
    }
    }