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ERC-721
Overview
Max Total Supply
0 MERC
Holders
39
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
1 MERCLoading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
Mercurials
Compiler Version
v0.8.20+commit.a1b79de6
Optimization Enabled:
Yes with 1000000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.20; import {ERC721} from "openzeppelin-contracts/contracts/token/ERC721/ERC721.sol"; import {Base64} from "openzeppelin-contracts/contracts/utils/Base64.sol"; import {Strings} from "openzeppelin-contracts/contracts/utils/Strings.sol"; import {ReentrancyGuard} from "openzeppelin-contracts/contracts/security/ReentrancyGuard.sol"; import {LinearVRGDA} from "VRGDAs/LinearVRGDA.sol"; import {SafeTransferLib} from "solmate/utils/SafeTransferLib.sol"; import {toDaysWadUnsafe} from "solmate/utils/SignedWadMath.sol"; /// @title Mercurials NFT /// @author nvonpentz /// @notice An on-chain generative art auction. contract Mercurials is ERC721, LinearVRGDA, ReentrancyGuard { // ====================== TYPES ====================== using Strings for uint256; // ============== PUBLIC STATE VARIABLES ============= /// @notice The total number of tokens sold, also used as the next token ID uint256 public totalSold; /// @notice The time at which the auction started uint256 public immutable startTime = block.timestamp; /// @notice The seed used to generate the token's attributes mapping(uint256 => uint256) public seeds; // ==================== CONSTANTS ==================== uint256 private constant BASE_FREQUENCY_MIN = 30; uint256 private constant BASE_FREQUENCY_MAX = 301; uint256 private constant NUM_OCTAVES_MIN = 1; uint256 private constant NUM_OCTAVES_MAX = 6; uint256 private constant SVG_SEED_MIN = 0; // Note: 65535 is the max value for the seed attribute of // the feTurbulence SVG element. uint256 private constant SVG_SEED_MAX = 65536; uint256 private constant SCALE_MIN = 0; uint256 private constant SCALE_MAX = 151; uint256 private constant SCALE_DELTA_MIN = 0; uint256 private constant SCALE_DELTA_MAX = 201; uint256 private constant SCALE_ANIMATION_MIN = 1; uint256 private constant SCALE_ANIMATION_MAX = 61; uint256 private constant KEY_TIME_MIN = 4; uint256 private constant KEY_TIME_MAX = 7; uint256 private constant HUE_ROTATE_ANIMATION_MIN = 1; uint256 private constant HUE_ROTATE_ANIMATION_MAX = 21; uint256 private constant K4_MIN = 0; uint256 private constant K4_MAX = 76; uint256 private constant INVERT_ELEVATION_MIN = 30; uint256 private constant INVERT_ELEVATION_MAX = 91; uint256 private constant INVERT_SURFACE_SCALE_MIN = 1; uint256 private constant INVERT_SURFACE_SCALE_MAX = 31; uint256 private constant STANDARD_ONE_DIFFUSE_CONSTANT_MIN = 1; uint256 private constant STANDARD_ONE_DIFFUSE_CONSTANT_MAX = 15; uint256 private constant STANDARD_TWO_ELEVATION_MIN = 0; uint256 private constant STANDARD_TWO_ELEVATION_MAX = 31; uint256 private constant STANDARD_TWO_SURFACE_SCALE_MIN = 1; uint256 private constant STANDARD_TWO_SURFACE_SCALE_MAX = 31; uint256 private constant ROTATION_MIN = 0; uint256 private constant ROTATION_MAX = 2; // ===================== EVENTS ===================== event TokenMinted( uint256 indexed tokenId, address indexed owner, uint256 price ); // ===================== ERRORS ===================== error InvalidBlockHash(); error InvalidTokenId(); error InsufficientFunds(); error TokenDoesNotExist(); // ================== CONSTRUCTOR =================== // @notice Sets the VRGDA parameters, and the ERC721 name and symbol constructor() ERC721("Mercurials", "MERC") LinearVRGDA( // Target price, 0.00001 Ether 0.00001e18, // Price decay percent, 5% 0.05e18, // Per time unit, 0.25 tokens a day, or 1 token every four days 0.25e18 ) {} // ============== EXTERNAL FUNCTIONS ================ /// @notice Mints a new token /// @param tokenId The token ID to mint /// @param blockHash The hash of the parent block number rounded down /// to the nearest multiple of 5 function mint( uint256 tokenId, bytes32 blockHash ) external payable nonReentrant { // Require that the user-supplied block hash matches the expected block hash // because otherwise the user would get an unexpected token. if ( blockHash != blockhash((block.number - 1) - ((block.number - 1) % 5)) ) { revert InvalidBlockHash(); } // Require that the user-supplied token ID matches the expected token ID // value because otherwise user would get an unexpected token. // Use totalSoldMemory memory variable to prevent multiple reads from state. uint256 totalSoldMemory = totalSold; if (tokenId != totalSoldMemory) { revert InvalidTokenId(); } // Ensure enough funds were sent. uint256 price = getVRGDAPrice( toDaysWadUnsafe(block.timestamp - startTime), totalSoldMemory ); if (msg.value < price) { revert InsufficientFunds(); } // Mint the NFT. _mint(msg.sender, tokenId); emit TokenMinted(tokenId, msg.sender, price); totalSold += 1; seeds[tokenId] = generateSeed(tokenId); // Refund the user any ETH they spent over the current price of the NFT. if (msg.value > price) { SafeTransferLib.safeTransferETH(msg.sender, msg.value - price); } } /// @notice Returns information about the token up for auction. /// @dev This function should be called using the `pending` block tag. /// @dev The id and blockHash should be passed as arguments to the `mint` function. /// @return id The token ID of the next token /// @return uri The token URI of the next token /// @return price The price of the next token /// @return blockHash The hash of the parent block number rounded down to /// the nearest multiple of 5 /// @return ttl The time to live, in blocks, of the next token function nextToken() external view returns ( uint256 id, string memory uri, uint256 price, bytes32 blockHash, uint256 ttl ) { // The ID of the next token will be also be the totalSold. id = totalSold; // Generate the token URI using the seed. uri = generateTokenUri(generateSeed(id), id); // Calculate the current price according to VRGDA rules. price = getVRGDAPrice(toDaysWadUnsafe(block.timestamp - startTime), id); // Calculate the block hash corresponding to the next token. blockHash = blockhash((block.number - 1) - ((block.number - 1) % 5)); // Calculate the time to live of the token. ttl = 5 - ((block.number - 1) % 5); return (id, uri, price, blockHash, ttl); } // =============== PUBLIC FUNCTIONS ================= // @notice Returns the token URI for a given token ID function tokenURI( uint256 tokenId ) public view override returns (string memory) { if (!_exists(tokenId)) { revert TokenDoesNotExist(); } return generateTokenUri(seeds[tokenId], tokenId); } // =============== INTERNAL FUNCTIONS ================ /// @notice Generates the seed for a given token ID /// @param tokenId The token ID to generate the seed for /// @return seed The seed for the given token ID function generateSeed(uint256 tokenId) internal view returns (uint256) { // Seed is calculated as the hash of the current token ID combined with the parent // block rounded down to the nearest 5. This ensures that the seed is // the same for 5 blocks. return uint256( keccak256( abi.encodePacked( blockhash( (block.number - 1) - ((block.number - 1) % 5) ), tokenId ) ) ); } /// @notice Generates a pseudo-random number from min (inclusive) to max (exclusive) /// @dev Callers must ensure that min < max /// @param seed The seed to use for the random number (the same across multiple calls) /// @param nonce The nonce to use for the random number (different between calls) function generateRandom( uint256 min, uint256 max, uint256 seed, uint256 nonce ) internal pure returns (uint256 random, uint256) { uint256 rand = uint256(keccak256(abi.encodePacked(seed, nonce))); nonce++; return ((rand % (max - min)) + min, nonce); } /// @notice Generates a random value that is either true or false /// @param seed The seed to use for the random number (the same across multiple calls) /// @param nonce The nonce to use for the random number (different between calls) function generateRandomBool( uint256 seed, uint256 nonce ) internal pure returns (bool, uint256) { uint256 rand = uint256(keccak256(abi.encodePacked(seed, nonce))); nonce++; return (rand % 2 == 0, nonce); } /// @notice Returns a string representation of a signed integer function intToString( uint256 value, bool isNegative ) internal pure returns (string memory) { if (isNegative && value != 0) { return string.concat("-", value.toString()); } return value.toString(); } /// @notice Generates the opening svg tag, opening filter tag, and /// the feTurbulence element function generateSvgOpenAndFeTurbulenceElement( uint256 seed, uint256 nonce ) internal pure returns (string memory element, string memory attributes, uint256) { // Generate a random value to use for the baseFrequency attribute. uint256 random; (random, nonce) = generateRandom( BASE_FREQUENCY_MIN, BASE_FREQUENCY_MAX, seed, nonce ); string memory baseFrequency; if (random < 100) { baseFrequency = string.concat("0.00", random.toString()); } else { baseFrequency = string.concat("0.0", random.toString()); } // Generate a random value to use for the numOctaves attribute. string memory numOctaves; (random, nonce) = generateRandom( NUM_OCTAVES_MIN, NUM_OCTAVES_MAX, seed, nonce ); numOctaves = random.toString(); // Generate a random value to use for the seed attribute of the SVG. string memory seedForSvg; (random, nonce) = generateRandom( SVG_SEED_MIN, SVG_SEED_MAX, seed, nonce ); seedForSvg = random.toString(); // Create the SVG element element = string.concat( '<svg width="350" height="350" version="1.1" viewBox="0 0 350 350" xmlns="http://www.w3.org/2000/svg"><filter id="a"><feTurbulence baseFrequency="', baseFrequency, '" numOctaves="', numOctaves, '" seed="', seedForSvg, '" />' ); // Create the attributes attributes = string.concat( '{ "trait_type": "Base Frequency", "value": "', baseFrequency, '" }, { "trait_type": "Octaves", "value": "', numOctaves, '" }, ' ); return (element, attributes, nonce); } /// @notice Generates the scale values for the feDisplacementMap SVG element function generateScale( uint256 seed, uint256 nonce ) internal pure returns (string memory scaleValues, uint256) { // Generate a random start value. uint256 start; bool startNegative; (start, nonce) = generateRandom(SCALE_MIN, SCALE_MAX, seed, nonce); (startNegative, nonce) = generateRandomBool(seed, nonce); // Generate a negative or positive delta value to add // to the start value to get the middle value. uint256 delta; bool deltaNegative; (delta, nonce) = generateRandom( SCALE_DELTA_MIN, SCALE_DELTA_MAX, seed, nonce ); (deltaNegative, nonce) = generateRandomBool(seed, nonce); // Based on the start and delta values, add start and delta together to // get the middle value. uint256 end; bool endNegative; if (startNegative == deltaNegative) { end = start + delta; endNegative = startNegative; } else { if (start > delta) { end = start - delta; endNegative = startNegative; } else { end = delta - start; endNegative = deltaNegative; } } // Convert the start value to a string representation. string memory scaleStart = intToString(start, startNegative); // Concatenate the start, middle, and end values of the scale animation. scaleValues = string.concat( scaleStart, ";", intToString(end, endNegative), ";", scaleStart, ";" ); return (scaleValues, nonce); } /// @notice Generates feDisplacementMap SVG element function generateFeDisplacementMapElement( uint256 seed, uint256 nonce ) internal pure returns (string memory element, string memory attributes, uint256) { // Generate scale values for the animation. string memory scaleValues; (scaleValues, nonce) = generateScale(seed, nonce); // Generate a random value for the scale animation duration in seconds. uint256 random; (random, nonce) = generateRandom( SCALE_ANIMATION_MIN, SCALE_ANIMATION_MAX, seed, nonce ); // Convert to string and append 's' to represent seconds in the SVG. string memory animationDuration = string.concat(random.toString(), "s"); // Generate a random number to be the middle keyTime value. (random, nonce) = generateRandom( KEY_TIME_MIN, KEY_TIME_MAX, seed, nonce ); string memory keyTime = string.concat("0.", random.toString()); element = string.concat( '<feDisplacementMap><animate attributeName="scale" values="', scaleValues, '" keyTimes="0; ', keyTime, '; 1" dur="', animationDuration, '" repeatCount="indefinite" calcMode="spline" keySplines="0.3 0 0.7 1; 0.3 0 0.7 1"/></feDisplacementMap>' ); attributes = string.concat( '{ "trait_type": "Scale", "value": "', scaleValues, '" }, { "trait_type": "Scale Animation", "value": "', animationDuration, '" }, { "trait_type": "Key Time", "value": "', keyTime, '" }, ' ); return (element, attributes, nonce); } /// @notice Generates the feColorMatrix element used for the rotation animation function generateFeColorMatrixElements( uint256 seed, uint256 nonce ) internal pure returns (string memory element, string memory attributes, uint256) { // Generate a value to be the duration of the animation uint256 random; (random, nonce) = generateRandom( HUE_ROTATE_ANIMATION_MIN, HUE_ROTATE_ANIMATION_MAX, seed, nonce ); string memory animationDuration = random.toString(); // Create the feColorMatrix element with the <animate> element inside. element = string.concat( '<feColorMatrix type="hueRotate" result="b"><animate attributeName="values" from="0" to="360" dur="', animationDuration, 's" repeatCount="indefinite"/></feColorMatrix><feColorMatrix type="matrix" result="c" values="0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0"/>' ); // Save the animation duration. attributes = string.concat( '{ "trait_type": "Hue Rotate Animation", "value": "', animationDuration, 's" }, ' ); return (element, attributes, nonce); } /// @notice Generates feComposite elements function generateFeCompositeElements( uint256 seed, uint256 nonce ) internal pure returns (string memory elements, string memory attributes, uint256) { // Generate a random value for the k4 attribute. uint256 random; (random, nonce) = generateRandom(K4_MIN, K4_MAX, seed, nonce); string memory k4; if (random < 10) { k4 = string.concat("0.0", random.toString()); } else { k4 = string.concat("0.", random.toString()); } // Make k4 negative half the time. bool randomBool; (randomBool, nonce) = generateRandomBool(seed, nonce); if (randomBool && random != 0) { k4 = string.concat("-", k4); } // Randomly choose either "out" or "in" for the operator attribute. string memory operator; (randomBool, nonce) = generateRandomBool(seed, nonce); if (randomBool) { operator = "out"; } else { operator = "in"; } // Create the feComposite elements. elements = string.concat( '<feComposite in="b" in2="c" operator="', operator, '" result="d"/><feComposite in="d" in2="d" operator="arithmetic" k1="1" k2="1" k3="1" k4="', k4, '"/>' ); // Create the attributes. attributes = string.concat( '{ "trait_type": "K4", "value": "', k4, '" }, { "trait_type": "Composite Operator", "value": "', operator, '" }, ' ); return (elements, attributes, nonce); } /// @notice Generates the feDiffuseLighting and feColorMatrix SVG elements. function generateLightingAndColorElements( uint256 seed, uint256 nonce ) internal pure returns (string memory element, string memory attributes, uint256) { uint256 random; string memory elevation; string memory surfaceScale; string memory diffuseConstant; // Determine whether the colors should be inverted. bool invert; (invert, nonce) = generateRandomBool(seed, nonce); if (invert) { // Generate elevation. (random, nonce) = generateRandom( INVERT_ELEVATION_MIN, INVERT_ELEVATION_MAX, seed, nonce ); elevation = random.toString(); // Generate surface scale. (random, nonce) = generateRandom( INVERT_SURFACE_SCALE_MIN, INVERT_SURFACE_SCALE_MAX, seed, nonce ); surfaceScale = random.toString(); // Set diffuse constant. diffuseConstant = "1"; } else { // Use two strategies for non-inverted case, randomly choose one. bool randomBool; (randomBool, nonce) = generateRandomBool(seed, nonce); if (randomBool) { // Strategy 1 // Elevation is always 1. elevation = "1"; // Surface scale is always 1. surfaceScale = "1"; // Generate diffuse constant before and after the decimal. (random, nonce) = generateRandom( STANDARD_ONE_DIFFUSE_CONSTANT_MIN, STANDARD_ONE_DIFFUSE_CONSTANT_MAX, seed, nonce ); diffuseConstant = random.toString(); (random, nonce) = generateRandom(0, 100, seed, nonce); diffuseConstant = string.concat( diffuseConstant, ".", random.toString() ); } else { // Strategy 2 // Generate elevation. (random, nonce) = generateRandom( STANDARD_TWO_ELEVATION_MIN, STANDARD_TWO_ELEVATION_MAX, seed, nonce ); elevation = random.toString(); // Generate surface scale. (random, nonce) = generateRandom( STANDARD_TWO_SURFACE_SCALE_MIN, STANDARD_TWO_SURFACE_SCALE_MAX, seed, nonce ); surfaceScale = random.toString(); // Diffuse constant is always 1. diffuseConstant = "1"; } } // Create the feDiffuseLighting element. element = string.concat( '<feDiffuseLighting lighting-color="#fff" diffuseConstant="', diffuseConstant, '" surfaceScale="', surfaceScale, '"><feDistantLight elevation="', elevation, '"/></feDiffuseLighting>', invert ? '<feColorMatrix type="matrix" values="-1 0 0 0 1 0 -1 0 0 1 0 0 -1 0 1 0 0 0 1 0"/>' : "" ); // Create the attributes. attributes = string.concat( '{ "trait_type": "Diffuse Constant", "value": "', diffuseConstant, '" }, { "trait_type": "Surface Scale", "value": "', surfaceScale, '" }, { "trait_type": "Elevation", "value": "', elevation, '" }, ', '{ "trait_type": "Inverted", "value": ', invert ? "true" : "false", " }, " ); return (element, attributes, nonce); } /// @notice Generates the main rect element but also includes the closing filter /// and closing svg tags function generateRectAndSvgClose( uint256 seed, uint256 nonce ) internal pure returns (string memory element, string memory attributes, uint256) { // Generate the rotation. uint256 rotation; (rotation, nonce) = generateRandom( ROTATION_MIN, ROTATION_MAX, seed, nonce ); rotation = rotation * 90; element = string.concat( '</filter><rect width="350" height="350" filter="url(#a)" transform="rotate(', rotation.toString(), ' 175 175)"/></svg>' ); attributes = string.concat( '{ "trait_type": "Rotation", "value": "', rotation.toString(), '" } ' // No comma here because this is the last attribute. ); return (element, attributes, nonce); } function generateSvg( uint256 seed ) internal pure returns (string memory svg, string memory attributes) { // Nonce is used to generate random numbers and is incremented after // each use. uint256 nonce; // Use block scoping to avoid stack too deep errors. { // Generate the feTurbulence element. string memory svgOpenAndFeTurbulenceElement; string memory feTurbulenceAttributes; ( svgOpenAndFeTurbulenceElement, feTurbulenceAttributes, nonce ) = generateSvgOpenAndFeTurbulenceElement(seed, nonce); // Generate the feDisplacementMap element. string memory feDisplacementMapElement; string memory feDisplacementMapAttributes; ( feDisplacementMapElement, feDisplacementMapAttributes, nonce ) = generateFeDisplacementMapElement(seed, nonce); // Concatenate the two elements with the SVG opening tag, and filter tag. svg = string.concat( svgOpenAndFeTurbulenceElement, feDisplacementMapElement ); // Concatenate the attributes. attributes = string.concat( feTurbulenceAttributes, feDisplacementMapAttributes ); } // Generate the feColorMatrix element. string memory feColorMatrixElements; string memory feColorMatrixAttributes; ( feColorMatrixElements, feColorMatrixAttributes, nonce ) = generateFeColorMatrixElements(seed, nonce); // Generate the feComposite elements. string memory feCompositeElements; string memory feCompositeAttributes; ( feCompositeElements, feCompositeAttributes, nonce ) = generateFeCompositeElements(seed, nonce); // Generate the lighting and color elements. string memory lightingAndColorElements; string memory lightingAndColorAttributes; ( lightingAndColorElements, lightingAndColorAttributes, nonce ) = generateLightingAndColorElements(seed, nonce); // Generate the rect and svg close elements. string memory rectAndSvgClose; string memory rectAttributes; (rectAndSvgClose, rectAttributes, nonce) = generateRectAndSvgClose( seed, nonce ); // Concatenate all the SVG elements creating the complete SVG. svg = string.concat( svg, feColorMatrixElements, feCompositeElements, lightingAndColorElements, rectAndSvgClose ); // Concatenate all the attributes. attributes = string.concat( attributes, feColorMatrixAttributes, feCompositeAttributes, lightingAndColorAttributes, rectAttributes ); return (svg, attributes); } /// @notice Generates the token URI for a given token ID function generateTokenUri( uint256 seed, uint256 tokenId ) internal pure returns (string memory tokenUri) { // Generate the SVG markup. (string memory svg, string memory attributes) = generateSvg(seed); // Create the token URI by base64 encoding the SVG markup, creating the // JSON metadata, and then base64 encoding that as a data URI. tokenUri = string.concat( "data:application/json;base64,", Base64.encode( bytes( string.concat( '{ "name": "Mercurial #', tokenId.toString(), '", "description": "Abstract on-chain generative art", "image": "data:image/svg+xml;base64,', Base64.encode(bytes(svg)), '", "attributes": [ ', attributes, " ] }" ) ) ) ); return tokenUri; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.2) (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; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/Base64.sol) pragma solidity ^0.8.0; /** * @dev Provides a set of functions to operate with Base64 strings. * * _Available since v4.5._ */ library Base64 { /** * @dev Base64 Encoding/Decoding Table */ string internal constant _TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /** * @dev Converts a `bytes` to its Bytes64 `string` representation. */ function encode(bytes memory data) internal pure returns (string memory) { /** * Inspired by Brecht Devos (Brechtpd) implementation - MIT licence * https://github.com/Brechtpd/base64/blob/e78d9fd951e7b0977ddca77d92dc85183770daf4/base64.sol */ if (data.length == 0) return ""; // Loads the table into memory string memory table = _TABLE; // Encoding takes 3 bytes chunks of binary data from `bytes` data parameter // and split into 4 numbers of 6 bits. // The final Base64 length should be `bytes` data length multiplied by 4/3 rounded up // - `data.length + 2` -> Round up // - `/ 3` -> Number of 3-bytes chunks // - `4 *` -> 4 characters for each chunk string memory result = new string(4 * ((data.length + 2) / 3)); /// @solidity memory-safe-assembly assembly { // Prepare the lookup table (skip the first "length" byte) let tablePtr := add(table, 1) // Prepare result pointer, jump over length let resultPtr := add(result, 32) // Run over the input, 3 bytes at a time for { let dataPtr := data let endPtr := add(data, mload(data)) } lt(dataPtr, endPtr) { } { // Advance 3 bytes dataPtr := add(dataPtr, 3) let input := mload(dataPtr) // To write each character, shift the 3 bytes (18 bits) chunk // 4 times in blocks of 6 bits for each character (18, 12, 6, 0) // and apply logical AND with 0x3F which is the number of // the previous character in the ASCII table prior to the Base64 Table // The result is then added to the table to get the character to write, // and finally write it in the result pointer but with a left shift // of 256 (1 byte) - 8 (1 ASCII char) = 248 bits mstore8(resultPtr, mload(add(tablePtr, and(shr(18, input), 0x3F)))) resultPtr := add(resultPtr, 1) // Advance mstore8(resultPtr, mload(add(tablePtr, and(shr(12, input), 0x3F)))) resultPtr := add(resultPtr, 1) // Advance mstore8(resultPtr, mload(add(tablePtr, and(shr(6, input), 0x3F)))) resultPtr := add(resultPtr, 1) // Advance mstore8(resultPtr, mload(add(tablePtr, and(input, 0x3F)))) resultPtr := add(resultPtr, 1) // Advance } // When data `bytes` is not exactly 3 bytes long // it is padded with `=` characters at the end switch mod(mload(data), 3) case 1 { mstore8(sub(resultPtr, 1), 0x3d) mstore8(sub(resultPtr, 2), 0x3d) } case 2 { mstore8(sub(resultPtr, 1), 0x3d) } } return result; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (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)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { _nonReentrantBefore(); _; _nonReentrantAfter(); } function _nonReentrantBefore() private { // On the first call to nonReentrant, _status will be _NOT_ENTERED require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; } function _nonReentrantAfter() private { // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } /** * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a * `nonReentrant` function in the call stack. */ function _reentrancyGuardEntered() internal view returns (bool) { return _status == _ENTERED; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0; import {unsafeWadDiv} from "solmate/utils/SignedWadMath.sol"; import {VRGDA} from "./VRGDA.sol"; /// @title Linear Variable Rate Gradual Dutch Auction /// @author transmissions11 <[email protected]> /// @author FrankieIsLost <[email protected]> /// @notice VRGDA with a linear issuance curve. abstract contract LinearVRGDA is VRGDA { /*////////////////////////////////////////////////////////////// PRICING PARAMETERS //////////////////////////////////////////////////////////////*/ /// @dev The total number of tokens to target selling every full unit of time. /// @dev Represented as an 18 decimal fixed point number. int256 internal immutable perTimeUnit; /// @notice Sets pricing parameters for the VRGDA. /// @param _targetPrice The target price for a token if sold on pace, scaled by 1e18. /// @param _priceDecayPercent The percent price decays per unit of time with no sales, scaled by 1e18. /// @param _perTimeUnit The number of tokens to target selling in 1 full unit of time, scaled by 1e18. constructor( int256 _targetPrice, int256 _priceDecayPercent, int256 _perTimeUnit ) VRGDA(_targetPrice, _priceDecayPercent) { perTimeUnit = _perTimeUnit; } /*////////////////////////////////////////////////////////////// PRICING LOGIC //////////////////////////////////////////////////////////////*/ /// @dev Given a number of tokens sold, return the target time that number of tokens should be sold by. /// @param sold A number of tokens sold, scaled by 1e18, to get the corresponding target sale time for. /// @return The target time the tokens should be sold by, scaled by 1e18, where the time is /// relative, such that 0 means the tokens should be sold immediately when the VRGDA begins. function getTargetSaleTime(int256 sold) public view virtual override returns (int256) { return unsafeWadDiv(sold, perTimeUnit); } }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; import {ERC20} from "../tokens/ERC20.sol"; /// @notice Safe ETH and ERC20 transfer library that gracefully handles missing return values. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SafeTransferLib.sol) /// @dev Use with caution! Some functions in this library knowingly create dirty bits at the destination of the free memory pointer. /// @dev Note that none of the functions in this library check that a token has code at all! That responsibility is delegated to the caller. library SafeTransferLib { /*////////////////////////////////////////////////////////////// ETH OPERATIONS //////////////////////////////////////////////////////////////*/ function safeTransferETH(address to, uint256 amount) internal { bool success; /// @solidity memory-safe-assembly assembly { // Transfer the ETH and store if it succeeded or not. success := call(gas(), to, amount, 0, 0, 0, 0) } require(success, "ETH_TRANSFER_FAILED"); } /*////////////////////////////////////////////////////////////// ERC20 OPERATIONS //////////////////////////////////////////////////////////////*/ function safeTransferFrom( ERC20 token, address from, address to, uint256 amount ) internal { bool success; /// @solidity memory-safe-assembly assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata into memory, beginning with the function selector. mstore(freeMemoryPointer, 0x23b872dd00000000000000000000000000000000000000000000000000000000) mstore(add(freeMemoryPointer, 4), from) // Append the "from" argument. mstore(add(freeMemoryPointer, 36), to) // Append the "to" argument. mstore(add(freeMemoryPointer, 68), amount) // Append the "amount" argument. success := and( // Set success to whether the call reverted, if not we check it either // returned exactly 1 (can't just be non-zero data), or had no return data. or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())), // We use 100 because the length of our calldata totals up like so: 4 + 32 * 3. // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space. // Counterintuitively, this call must be positioned second to the or() call in the // surrounding and() call or else returndatasize() will be zero during the computation. call(gas(), token, 0, freeMemoryPointer, 100, 0, 32) ) } require(success, "TRANSFER_FROM_FAILED"); } function safeTransfer( ERC20 token, address to, uint256 amount ) internal { bool success; /// @solidity memory-safe-assembly assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata into memory, beginning with the function selector. mstore(freeMemoryPointer, 0xa9059cbb00000000000000000000000000000000000000000000000000000000) mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument. mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. success := and( // Set success to whether the call reverted, if not we check it either // returned exactly 1 (can't just be non-zero data), or had no return data. or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())), // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2. // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space. // Counterintuitively, this call must be positioned second to the or() call in the // surrounding and() call or else returndatasize() will be zero during the computation. call(gas(), token, 0, freeMemoryPointer, 68, 0, 32) ) } require(success, "TRANSFER_FAILED"); } function safeApprove( ERC20 token, address to, uint256 amount ) internal { bool success; /// @solidity memory-safe-assembly assembly { // Get a pointer to some free memory. let freeMemoryPointer := mload(0x40) // Write the abi-encoded calldata into memory, beginning with the function selector. mstore(freeMemoryPointer, 0x095ea7b300000000000000000000000000000000000000000000000000000000) mstore(add(freeMemoryPointer, 4), to) // Append the "to" argument. mstore(add(freeMemoryPointer, 36), amount) // Append the "amount" argument. success := and( // Set success to whether the call reverted, if not we check it either // returned exactly 1 (can't just be non-zero data), or had no return data. or(and(eq(mload(0), 1), gt(returndatasize(), 31)), iszero(returndatasize())), // We use 68 because the length of our calldata totals up like so: 4 + 32 * 2. // We use 0 and 32 to copy up to 32 bytes of return data into the scratch space. // Counterintuitively, this call must be positioned second to the or() call in the // surrounding and() call or else returndatasize() will be zero during the computation. call(gas(), token, 0, freeMemoryPointer, 68, 0, 32) ) } require(success, "APPROVE_FAILED"); } }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0; /// @notice Signed 18 decimal fixed point (wad) arithmetic library. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/SignedWadMath.sol) /// @author Modified from Remco Bloemen (https://xn--2-umb.com/22/exp-ln/index.html) /// @dev Will not revert on overflow, only use where overflow is not possible. function toWadUnsafe(uint256 x) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Multiply x by 1e18. r := mul(x, 1000000000000000000) } } /// @dev Takes an integer amount of seconds and converts it to a wad amount of days. /// @dev Will not revert on overflow, only use where overflow is not possible. /// @dev Not meant for negative second amounts, it assumes x is positive. function toDaysWadUnsafe(uint256 x) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Multiply x by 1e18 and then divide it by 86400. r := div(mul(x, 1000000000000000000), 86400) } } /// @dev Takes a wad amount of days and converts it to an integer amount of seconds. /// @dev Will not revert on overflow, only use where overflow is not possible. /// @dev Not meant for negative day amounts, it assumes x is positive. function fromDaysWadUnsafe(int256 x) pure returns (uint256 r) { /// @solidity memory-safe-assembly assembly { // Multiply x by 86400 and then divide it by 1e18. r := div(mul(x, 86400), 1000000000000000000) } } /// @dev Will not revert on overflow, only use where overflow is not possible. function unsafeWadMul(int256 x, int256 y) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Multiply x by y and divide by 1e18. r := sdiv(mul(x, y), 1000000000000000000) } } /// @dev Will return 0 instead of reverting if y is zero and will /// not revert on overflow, only use where overflow is not possible. function unsafeWadDiv(int256 x, int256 y) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Multiply x by 1e18 and divide it by y. r := sdiv(mul(x, 1000000000000000000), y) } } function wadMul(int256 x, int256 y) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Store x * y in r for now. r := mul(x, y) // Equivalent to require(x == 0 || (x * y) / x == y) if iszero(or(iszero(x), eq(sdiv(r, x), y))) { revert(0, 0) } // Scale the result down by 1e18. r := sdiv(r, 1000000000000000000) } } function wadDiv(int256 x, int256 y) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Store x * 1e18 in r for now. r := mul(x, 1000000000000000000) // Equivalent to require(y != 0 && ((x * 1e18) / 1e18 == x)) if iszero(and(iszero(iszero(y)), eq(sdiv(r, 1000000000000000000), x))) { revert(0, 0) } // Divide r by y. r := sdiv(r, y) } } /// @dev Will not work with negative bases, only use when x is positive. function wadPow(int256 x, int256 y) pure returns (int256) { // Equivalent to x to the power of y because x ** y = (e ** ln(x)) ** y = e ** (ln(x) * y) return wadExp((wadLn(x) * y) / 1e18); // Using ln(x) means x must be greater than 0. } function wadExp(int256 x) pure returns (int256 r) { unchecked { // When the result is < 0.5 we return zero. This happens when // x <= floor(log(0.5e18) * 1e18) ~ -42e18 if (x <= -42139678854452767551) return 0; // When the result is > (2**255 - 1) / 1e18 we can not represent it as an // int. This happens when x >= floor(log((2**255 - 1) / 1e18) * 1e18) ~ 135. if (x >= 135305999368893231589) revert("EXP_OVERFLOW"); // x is now in the range (-42, 136) * 1e18. Convert to (-42, 136) * 2**96 // for more intermediate precision and a binary basis. This base conversion // is a multiplication by 1e18 / 2**96 = 5**18 / 2**78. x = (x << 78) / 5**18; // Reduce range of x to (-½ ln 2, ½ ln 2) * 2**96 by factoring out powers // of two such that exp(x) = exp(x') * 2**k, where k is an integer. // Solving this gives k = round(x / log(2)) and x' = x - k * log(2). int256 k = ((x << 96) / 54916777467707473351141471128 + 2**95) >> 96; x = x - k * 54916777467707473351141471128; // k is in the range [-61, 195]. // Evaluate using a (6, 7)-term rational approximation. // p is made monic, we'll multiply by a scale factor later. int256 y = x + 1346386616545796478920950773328; y = ((y * x) >> 96) + 57155421227552351082224309758442; int256 p = y + x - 94201549194550492254356042504812; p = ((p * y) >> 96) + 28719021644029726153956944680412240; p = p * x + (4385272521454847904659076985693276 << 96); // We leave p in 2**192 basis so we don't need to scale it back up for the division. int256 q = x - 2855989394907223263936484059900; q = ((q * x) >> 96) + 50020603652535783019961831881945; q = ((q * x) >> 96) - 533845033583426703283633433725380; q = ((q * x) >> 96) + 3604857256930695427073651918091429; q = ((q * x) >> 96) - 14423608567350463180887372962807573; q = ((q * x) >> 96) + 26449188498355588339934803723976023; /// @solidity memory-safe-assembly assembly { // Div in assembly because solidity adds a zero check despite the unchecked. // The q polynomial won't have zeros in the domain as all its roots are complex. // No scaling is necessary because p is already 2**96 too large. r := sdiv(p, q) } // r should be in the range (0.09, 0.25) * 2**96. // We now need to multiply r by: // * the scale factor s = ~6.031367120. // * the 2**k factor from the range reduction. // * the 1e18 / 2**96 factor for base conversion. // We do this all at once, with an intermediate result in 2**213 // basis, so the final right shift is always by a positive amount. r = int256((uint256(r) * 3822833074963236453042738258902158003155416615667) >> uint256(195 - k)); } } function wadLn(int256 x) pure returns (int256 r) { unchecked { require(x > 0, "UNDEFINED"); // We want to convert x from 10**18 fixed point to 2**96 fixed point. // We do this by multiplying by 2**96 / 10**18. But since // ln(x * C) = ln(x) + ln(C), we can simply do nothing here // and add ln(2**96 / 10**18) at the end. /// @solidity memory-safe-assembly assembly { r := shl(7, lt(0xffffffffffffffffffffffffffffffff, x)) r := or(r, shl(6, lt(0xffffffffffffffff, shr(r, x)))) r := or(r, shl(5, lt(0xffffffff, shr(r, x)))) r := or(r, shl(4, lt(0xffff, shr(r, x)))) r := or(r, shl(3, lt(0xff, shr(r, x)))) r := or(r, shl(2, lt(0xf, shr(r, x)))) r := or(r, shl(1, lt(0x3, shr(r, x)))) r := or(r, lt(0x1, shr(r, x))) } // Reduce range of x to (1, 2) * 2**96 // ln(2^k * x) = k * ln(2) + ln(x) int256 k = r - 96; x <<= uint256(159 - k); x = int256(uint256(x) >> 159); // Evaluate using a (8, 8)-term rational approximation. // p is made monic, we will multiply by a scale factor later. int256 p = x + 3273285459638523848632254066296; p = ((p * x) >> 96) + 24828157081833163892658089445524; p = ((p * x) >> 96) + 43456485725739037958740375743393; p = ((p * x) >> 96) - 11111509109440967052023855526967; p = ((p * x) >> 96) - 45023709667254063763336534515857; p = ((p * x) >> 96) - 14706773417378608786704636184526; p = p * x - (795164235651350426258249787498 << 96); // We leave p in 2**192 basis so we don't need to scale it back up for the division. // q is monic by convention. int256 q = x + 5573035233440673466300451813936; q = ((q * x) >> 96) + 71694874799317883764090561454958; q = ((q * x) >> 96) + 283447036172924575727196451306956; q = ((q * x) >> 96) + 401686690394027663651624208769553; q = ((q * x) >> 96) + 204048457590392012362485061816622; q = ((q * x) >> 96) + 31853899698501571402653359427138; q = ((q * x) >> 96) + 909429971244387300277376558375; /// @solidity memory-safe-assembly assembly { // Div in assembly because solidity adds a zero check despite the unchecked. // The q polynomial is known not to have zeros in the domain. // No scaling required because p is already 2**96 too large. r := sdiv(p, q) } // r is in the range (0, 0.125) * 2**96 // Finalization, we need to: // * multiply by the scale factor s = 5.549… // * add ln(2**96 / 10**18) // * add k * ln(2) // * multiply by 10**18 / 2**96 = 5**18 >> 78 // mul s * 5e18 * 2**96, base is now 5**18 * 2**192 r *= 1677202110996718588342820967067443963516166; // add ln(2) * k * 5e18 * 2**192 r += 16597577552685614221487285958193947469193820559219878177908093499208371 * k; // add ln(2**96 / 10**18) * 5e18 * 2**192 r += 600920179829731861736702779321621459595472258049074101567377883020018308; // base conversion: mul 2**18 / 2**192 r >>= 174; } } /// @dev Will return 0 instead of reverting if y is zero. function unsafeDiv(int256 x, int256 y) pure returns (int256 r) { /// @solidity memory-safe-assembly assembly { // Divide x by y. r := sdiv(x, y) } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (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); }
// 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); }
// 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); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (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); } } }
// 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; } }
// 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; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.8.0) (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); } } }
// 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); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.8.0; import {wadExp, wadLn, wadMul, unsafeWadMul, toWadUnsafe} from "solmate/utils/SignedWadMath.sol"; /// @title Variable Rate Gradual Dutch Auction /// @author transmissions11 <[email protected]> /// @author FrankieIsLost <[email protected]> /// @notice Sell tokens roughly according to an issuance schedule. abstract contract VRGDA { /*////////////////////////////////////////////////////////////// VRGDA PARAMETERS //////////////////////////////////////////////////////////////*/ /// @notice Target price for a token, to be scaled according to sales pace. /// @dev Represented as an 18 decimal fixed point number. int256 public immutable targetPrice; /// @dev Precomputed constant that allows us to rewrite a pow() as an exp(). /// @dev Represented as an 18 decimal fixed point number. int256 internal immutable decayConstant; /// @notice Sets target price and per time unit price decay for the VRGDA. /// @param _targetPrice The target price for a token if sold on pace, scaled by 1e18. /// @param _priceDecayPercent The percent price decays per unit of time with no sales, scaled by 1e18. constructor(int256 _targetPrice, int256 _priceDecayPercent) { targetPrice = _targetPrice; decayConstant = wadLn(1e18 - _priceDecayPercent); // The decay constant must be negative for VRGDAs to work. require(decayConstant < 0, "NON_NEGATIVE_DECAY_CONSTANT"); } /*////////////////////////////////////////////////////////////// PRICING LOGIC //////////////////////////////////////////////////////////////*/ /// @notice Calculate the price of a token according to the VRGDA formula. /// @param timeSinceStart Time passed since the VRGDA began, scaled by 1e18. /// @param sold The total number of tokens that have been sold so far. /// @return The price of a token according to VRGDA, scaled by 1e18. function getVRGDAPrice(int256 timeSinceStart, uint256 sold) public view virtual returns (uint256) { unchecked { // prettier-ignore return uint256(wadMul(targetPrice, wadExp(unsafeWadMul(decayConstant, // Theoretically calling toWadUnsafe with sold can silently overflow but under // any reasonable circumstance it will never be large enough. We use sold + 1 as // the VRGDA formula's n param represents the nth token and sold is the n-1th token. timeSinceStart - getTargetSaleTime(toWadUnsafe(sold + 1)) )))); } } /// @dev Given a number of tokens sold, return the target time that number of tokens should be sold by. /// @param sold A number of tokens sold, scaled by 1e18, to get the corresponding target sale time for. /// @return The target time the tokens should be sold by, scaled by 1e18, where the time is /// relative, such that 0 means the tokens should be sold immediately when the VRGDA begins. function getTargetSaleTime(int256 sold) public view virtual returns (int256); }
// SPDX-License-Identifier: AGPL-3.0-only pragma solidity >=0.8.0; /// @notice Modern and gas efficient ERC20 + EIP-2612 implementation. /// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC20.sol) /// @author Modified from Uniswap (https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol) /// @dev Do not manually set balances without updating totalSupply, as the sum of all user balances must not exceed it. abstract contract ERC20 { /*////////////////////////////////////////////////////////////// EVENTS //////////////////////////////////////////////////////////////*/ event Transfer(address indexed from, address indexed to, uint256 amount); event Approval(address indexed owner, address indexed spender, uint256 amount); /*////////////////////////////////////////////////////////////// METADATA STORAGE //////////////////////////////////////////////////////////////*/ string public name; string public symbol; uint8 public immutable decimals; /*////////////////////////////////////////////////////////////// ERC20 STORAGE //////////////////////////////////////////////////////////////*/ uint256 public totalSupply; mapping(address => uint256) public balanceOf; mapping(address => mapping(address => uint256)) public allowance; /*////////////////////////////////////////////////////////////// EIP-2612 STORAGE //////////////////////////////////////////////////////////////*/ uint256 internal immutable INITIAL_CHAIN_ID; bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR; mapping(address => uint256) public nonces; /*////////////////////////////////////////////////////////////// CONSTRUCTOR //////////////////////////////////////////////////////////////*/ constructor( string memory _name, string memory _symbol, uint8 _decimals ) { name = _name; symbol = _symbol; decimals = _decimals; INITIAL_CHAIN_ID = block.chainid; INITIAL_DOMAIN_SEPARATOR = computeDomainSeparator(); } /*////////////////////////////////////////////////////////////// ERC20 LOGIC //////////////////////////////////////////////////////////////*/ function approve(address spender, uint256 amount) public virtual returns (bool) { allowance[msg.sender][spender] = amount; emit Approval(msg.sender, spender, amount); return true; } function transfer(address to, uint256 amount) public virtual returns (bool) { balanceOf[msg.sender] -= amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(msg.sender, to, amount); return true; } function transferFrom( address from, address to, uint256 amount ) public virtual returns (bool) { uint256 allowed = allowance[from][msg.sender]; // Saves gas for limited approvals. if (allowed != type(uint256).max) allowance[from][msg.sender] = allowed - amount; balanceOf[from] -= amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(from, to, amount); return true; } /*////////////////////////////////////////////////////////////// EIP-2612 LOGIC //////////////////////////////////////////////////////////////*/ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual { require(deadline >= block.timestamp, "PERMIT_DEADLINE_EXPIRED"); // Unchecked because the only math done is incrementing // the owner's nonce which cannot realistically overflow. unchecked { address recoveredAddress = ecrecover( keccak256( abi.encodePacked( "\x19\x01", DOMAIN_SEPARATOR(), keccak256( abi.encode( keccak256( "Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)" ), owner, spender, value, nonces[owner]++, deadline ) ) ) ), v, r, s ); require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNER"); allowance[recoveredAddress][spender] = value; } emit Approval(owner, spender, value); } function DOMAIN_SEPARATOR() public view virtual returns (bytes32) { return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : computeDomainSeparator(); } function computeDomainSeparator() internal view virtual returns (bytes32) { return keccak256( abi.encode( keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name)), keccak256("1"), block.chainid, address(this) ) ); } /*////////////////////////////////////////////////////////////// INTERNAL MINT/BURN LOGIC //////////////////////////////////////////////////////////////*/ function _mint(address to, uint256 amount) internal virtual { totalSupply += amount; // Cannot overflow because the sum of all user // balances can't exceed the max uint256 value. unchecked { balanceOf[to] += amount; } emit Transfer(address(0), to, amount); } function _burn(address from, uint256 amount) internal virtual { balanceOf[from] -= amount; // Cannot underflow because a user's balance // will never be larger than the total supply. unchecked { totalSupply -= amount; } emit Transfer(from, address(0), amount); } }
// 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); }
{ "remappings": [ "VRGDAs/=lib/VRGDAs/src/", "ds-test/=lib/forge-std/lib/ds-test/src/", "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/", "forge-std/=lib/forge-std/src/", "openzeppelin-contracts/=lib/openzeppelin-contracts/", "openzeppelin/=lib/openzeppelin-contracts/contracts/", "solmate/=lib/solmate/src/" ], "optimizer": { "enabled": true, "runs": 1000000 }, "metadata": { "bytecodeHash": "ipfs", "appendCBOR": true }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "evmVersion": "paris", "libraries": {} }
Contract Security Audit
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Type":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"targetPrice","outputs":[{"internalType":"int256","name":"","type":"int256"}],"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":"totalSold","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"}]
Contract Creation Code
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