Token

Contract Source Code (Solidity Standard Json-Input format)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.7.6;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/Address.sol";

import "../governance/Governed.sol";
import "../libraries/HexStrings.sol";
import "./ISubgraphNFT.sol";
import "./ISubgraphNFTDescriptor.sol";

/// @title NFT that represents ownership of a Subgraph
contract SubgraphNFT is Governed, ERC721, ISubgraphNFT {
    // -- State --

    address public minter;
    ISubgraphNFTDescriptor public tokenDescriptor;
    mapping(uint256 => bytes32) private _subgraphMetadataHashes;

    // -- Events --

    event MinterUpdated(address minter);
    event TokenDescriptorUpdated(address tokenDescriptor);
    event SubgraphMetadataUpdated(uint256 indexed tokenID, bytes32 subgraphURI);

    // -- Modifiers --

    modifier onlyMinter() {
        require(msg.sender == minter, "Must be a minter");
        _;
    }

    constructor(address _governor) ERC721("Subgraph", "SG") {
        _initialize(_governor);
    }

    // -- Config --

    /**
     * @notice Set the minter allowed to perform actions on the NFT.
     * @dev Minter can mint, burn and update the metadata
     * @param _minter Address of the allowed minter
     */
    function setMinter(address _minter) external override onlyGovernor {
        _setMinter(_minter);
    }

    /**
     * @notice Internal: Set the minter allowed to perform actions on the NFT.
     * @dev Minter can mint, burn and update the metadata. Can be set to zero.
     * @param _minter Address of the allowed minter
     */
    function _setMinter(address _minter) internal {
        minter = _minter;
        emit MinterUpdated(_minter);
    }

    /**
     * @notice Set the token descriptor contract.
     * @dev Token descriptor can be zero. If set, it must be a contract.
     * @param _tokenDescriptor Address of the contract that creates the NFT token URI
     */
    function setTokenDescriptor(address _tokenDescriptor) external override onlyGovernor {
        _setTokenDescriptor(_tokenDescriptor);
    }

    /**
     * @dev Internal: Set the token descriptor contract used to create the ERC-721 metadata URI.
     * @param _tokenDescriptor Address of the contract that creates the NFT token URI
     */
    function _setTokenDescriptor(address _tokenDescriptor) internal {
        require(
            _tokenDescriptor == address(0) || Address.isContract(_tokenDescriptor),
            "NFT: Invalid token descriptor"
        );
        tokenDescriptor = ISubgraphNFTDescriptor(_tokenDescriptor);
        emit TokenDescriptorUpdated(_tokenDescriptor);
    }

    /**
     * @notice Set the base URI.
     * @dev Can be set to empty.
     * @param _baseURI Base URI to use to build the token URI
     */
    function setBaseURI(string memory _baseURI) external override onlyGovernor {
        _setBaseURI(_baseURI);
    }

    // -- Minter actions --

    /**
     * @notice Mint `_tokenId` and transfers it to `_to`.
     * @dev `tokenId` must not exist and `to` cannot be the zero address.
     * @param _to Address receiving the minted NFT
     * @param _tokenId ID of the NFT
     */
    function mint(address _to, uint256 _tokenId) external override onlyMinter {
        _mint(_to, _tokenId);
    }

    /**
     * @notice Burn `_tokenId`.
     * @dev The approval is cleared when the token is burned.
     * @param _tokenId ID of the NFT
     */
    function burn(uint256 _tokenId) external override onlyMinter {
        _burn(_tokenId);
    }

    /**
     * @notice Set the metadata for a subgraph represented by `_tokenId`.
     * @dev `_tokenId` must exist.
     * @param _tokenId ID of the NFT
     * @param _subgraphMetadata IPFS hash for the metadata
     */
    function setSubgraphMetadata(uint256 _tokenId, bytes32 _subgraphMetadata)
        external
        override
        onlyMinter
    {
        require(_exists(_tokenId), "ERC721Metadata: URI set of nonexistent token");
        _subgraphMetadataHashes[_tokenId] = _subgraphMetadata;
        emit SubgraphMetadataUpdated(_tokenId, _subgraphMetadata);
    }

    // -- NFT display --

    /// @inheritdoc ERC721
    function tokenURI(uint256 _tokenId)
        public
        view
        override(ERC721, ISubgraphNFT)
        returns (string memory)
    {
        require(_exists(_tokenId), "ERC721Metadata: URI query for nonexistent token");

        // Delegates rendering of the metadata to the token descriptor if existing
        // This allows for some flexibility in adapting the token URI
        if (address(tokenDescriptor) != address(0)) {
            return
                tokenDescriptor.tokenURI(
                    minter,
                    _tokenId,
                    baseURI(),
                    _subgraphMetadataHashes[_tokenId]
                );
        }

        // Default token URI
        uint256 metadata = uint256(_subgraphMetadataHashes[_tokenId]);

        string memory _subgraphURI = metadata > 0 ? HexStrings.toString(metadata) : "";
        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _subgraphURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_subgraphURI).length > 0) {
            return string(abi.encodePacked(base, _subgraphURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, HexStrings.toString(_tokenId)));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../utils/Context.sol";
import "./IERC721.sol";
import "./IERC721Metadata.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Receiver.sol";
import "../../introspection/ERC165.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
import "../../utils/EnumerableSet.sol";
import "../../utils/EnumerableMap.sol";
import "../../utils/Strings.sol";

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping (uint256 => string) private _tokenURIs;

    // Base URI
    string private _baseURI;

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @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 _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, tokenId.toString()));
    }

    /**
    * @dev Returns the base URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function baseURI() public view virtual returns (string memory) {
        return _baseURI;
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        return _holderTokens[owner].at(index);
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @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 || ERC721.isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(address from, address to, uint256 tokenId) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(address from, address to, uint256 tokenId, bytes memory _data) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _tokenOwners.contains(tokenId);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || ERC721.isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) 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);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

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

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId); // internal owner

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

        // Clear approvals
        _approve(address(0), tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(address from, address to, uint256 tokenId) internal virtual {
        require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        private returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721: transfer to non ERC721Receiver implementer");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == _ERC721_RECEIVED);
    }

    /**
     * @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); // internal owner
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal virtual { }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.7.6;

/**
 * @title Graph Governance contract
 * @dev All contracts that will be owned by a Governor entity should extend this contract.
 */
contract Governed {
    // -- State --

    address public governor;
    address public pendingGovernor;

    // -- Events --

    event NewPendingOwnership(address indexed from, address indexed to);
    event NewOwnership(address indexed from, address indexed to);

    /**
     * @dev Check if the caller is the governor.
     */
    modifier onlyGovernor() {
        require(msg.sender == governor, "Only Governor can call");
        _;
    }

    /**
     * @dev Initialize the governor to the contract caller.
     */
    function _initialize(address _initGovernor) internal {
        governor = _initGovernor;
    }

    /**
     * @dev Admin function to begin change of governor. The `_newGovernor` must call
     * `acceptOwnership` to finalize the transfer.
     * @param _newGovernor Address of new `governor`
     */
    function transferOwnership(address _newGovernor) external onlyGovernor {
        require(_newGovernor != address(0), "Governor must be set");

        address oldPendingGovernor = pendingGovernor;
        pendingGovernor = _newGovernor;

        emit NewPendingOwnership(oldPendingGovernor, pendingGovernor);
    }

    /**
     * @dev Admin function for pending governor to accept role and update governor.
     * This function must called by the pending governor.
     */
    function acceptOwnership() external {
        require(
            pendingGovernor != address(0) && msg.sender == pendingGovernor,
            "Caller must be pending governor"
        );

        address oldGovernor = governor;
        address oldPendingGovernor = pendingGovernor;

        governor = pendingGovernor;
        pendingGovernor = address(0);

        emit NewOwnership(oldGovernor, governor);
        emit NewPendingOwnership(oldPendingGovernor, pendingGovernor);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.7.6;

/// @title HexStrings
/// Based on https://github.com/OpenZeppelin/openzeppelin-contracts/blob/8dd744fc1843d285c38e54e9d439dea7f6b93495/contracts/utils/Strings.sol
library HexStrings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /// @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
    function toString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /// @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.7.6;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

interface ISubgraphNFT is IERC721 {
    // -- Config --

    function setMinter(address _minter) external;

    function setTokenDescriptor(address _tokenDescriptor) external;

    function setBaseURI(string memory _baseURI) external;

    // -- Actions --

    function mint(address _to, uint256 _tokenId) external;

    function burn(uint256 _tokenId) external;

    function setSubgraphMetadata(uint256 _tokenId, bytes32 _subgraphMetadata) external;

    function tokenURI(uint256 _tokenId) external view returns (string memory);
}

// SPDX-License-Identifier: GPL-2.0-or-later

pragma solidity ^0.7.6;

/// @title Describes subgraph NFT tokens via URI
interface ISubgraphNFTDescriptor {
    /// @notice Produces the URI describing a particular token ID for a Subgraph
    /// @dev Note this URI may be data: URI with the JSON contents directly inlined
    /// @param _minter Address of the allowed minter
    /// @param _tokenId The ID of the subgraph NFT for which to produce a description, which may not be valid
    /// @param _baseURI The base URI that could be prefixed to the final URI
    /// @param _subgraphMetadata Subgraph metadata set for the subgraph
    /// @return The URI of the ERC721-compliant metadata
    function tokenURI(
        address _minter,
        uint256 _tokenId,
        string calldata _baseURI,
        bytes32 _subgraphMetadata
    ) external view returns (string memory);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "../../introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
      * @dev Safely transfers `tokenId` token from `from` to `to`.
      *
      * Requirements:
      *
      * - `from` cannot be the zero address.
      * - `to` cannot be the zero address.
      * - `tokenId` token must exist and be owned by `from`.
      * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
      * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
      *
      * Emits a {Transfer} event.
      */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <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);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {

    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;

        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            bytes32 lastvalue = set._values[lastIndex];

            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }


    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function _set(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function _remove(Map storage map, bytes32 key) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function _contains(Map storage map, bytes32 key) private view returns (bool) {
        return map._indexes[key] != 0;
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.length;
    }

   /**
    * @dev Returns the key-value pair stored at position `index` in the map. O(1).
    *
    * Note that there are no guarantees on the ordering of entries inside the
    * array, and it may change when more entries are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    function _get(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(UintToAddressMap storage map, uint256 key, address value) internal returns (bool) {
        return _set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return _remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return _contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return _length(map._inner);
    }

   /**
    * @dev Returns the element stored at position `index` in the set. O(1).
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = _at(map._inner, index);
        return (uint256(key), address(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = _tryGet(map._inner, bytes32(key));
        return (success, address(uint160(uint256(value))));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(UintToAddressMap storage map, uint256 key, string memory errorMessage) internal view returns (address) {
        return address(uint160(uint256(_get(map._inner, bytes32(key), errorMessage))));
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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);
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_governor","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"minter","type":"address"}],"name":"MinterUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"NewOwnership","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"}],"name":"NewPendingOwnership","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenID","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"subgraphURI","type":"bytes32"}],"name":"SubgraphMetadataUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"tokenDescriptor","type":"address"}],"name":"TokenDescriptorUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"baseURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"burn","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"governor","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"minter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pendingGovernor","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_baseURI","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_minter","type":"address"}],"name":"setMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"bytes32","name":"_subgraphMetadata","type":"bytes32"}],"name":"setSubgraphMetadata","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_tokenDescriptor","type":"address"}],"name":"setTokenDescriptor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tokenDescriptor","outputs":[{"internalType":"contract ISubgraphNFTDescriptor","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newGovernor","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000e04fce05e9b8d21521bd1b0f069982c03bd31f76

-----Decoded View---------------
Arg [0] : _governor (address): 0xE04FcE05E9B8d21521bd1B0f069982c03BD31F76

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000e04fce05e9b8d21521bd1b0f069982c03bd31f76