Contract Source Code:
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.4;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "./base64.sol";
import "./render.sol";
library Bitfield {
function setBit(bytes32 self, uint8 bit) internal pure returns (bytes32) {
return self | bytes32(1 << (255 - bit));
}
function getBit(bytes32 self, uint8 bit) internal pure returns (bool) {
return uint256((self << bit) >> 255) == 1;
}
}
contract Measurable {
event Measurement(
string name,
uint256 gas
);
constructor() {
uint256 chainId;
assembly {
chainId := chainid()
}
require(1 != chainId);
}
modifier measured(string memory name) {
uint256 before = gasleft();
_;
emit Measurement(name, before - gasleft());
}
}
library TokenAttributes {
/*
+-------+----------+-------+-------+-------+
| color | negative | left | nose | right |
+-------+----------+-------+-------+-------+
| uint7 | uint1 | uint8 | uint8 | uint8 |
+-------+----------+-------+-------+-------+
*/
function newFace(
bool negative,
uint8 color,
uint8 leftEye,
uint8 nose,
uint8 rightEye
) internal pure returns (uint32) {
uint32 face = (uint32(color) << 25)
| (uint32(leftEye) << 16)
| (uint32(nose) << 8)
| uint32(rightEye);
if (negative) {
face |= 0x01000000;
}
return face;
}
function faceColor(uint32 self) internal pure returns (uint8) {
return uint8(self >> 25);
}
function faceNegative(uint32 self) internal pure returns (bool) {
return 0 != (self & 0x01000000);
}
function faceLeftEye(uint32 self) internal pure returns (uint8) {
return uint8(self >> 16);
}
function faceRightEye(uint32 self) internal pure returns (uint8) {
return uint8(self);
}
function faceNose(uint32 self) internal pure returns (uint8) {
return uint8(self >> 8);
}
function faceBit(uint32 self) internal pure returns (uint8) {
unchecked {
return uint8(self >> 16) + (7 * uint8(self >> 8)) + (21 * uint8(self));
}
}
}
abstract contract Attributes {
using TokenAttributes for uint32;
using Bitfield for bytes32;
uint8 constant internal COLORS = 7;
uint8 constant internal EYES = 7;
uint8 constant internal NOSES = 3;
bytes32 internal unique;
function takeFace(bytes32 input, uint32 face) private pure returns (bool success, bytes32 output) {
uint8 bit = face.faceBit();
if (input.getBit(bit)) {
success = false;
output = input;
} else {
success = true;
output = input.setBit(bit);
}
}
// (274 bytes)
function pickEye(uint8 seed) private pure returns (uint8) {
if (seed < 80) return 0;
if (seed < 144) return 1;
if (seed < 184) return 2;
if (seed < 224) return 3;
if (seed < 246) return 4;
if (seed < 254) return 5;
return 6;
}
// (98 bytes)
function pickNose(uint8 seed) private pure returns (uint8) {
if (seed < 156) return 0;
if (seed < 244) return 1;
return 2;
}
// (137 bytes)
function pickColor(uint8 seed) private pure returns (uint8) {
return seed % COLORS;
}
// (20 bytes)
function pickNegative(uint8 seed) private pure returns (bool) {
return seed >= 254;
}
function pickFace(bytes32 seed) private pure returns (uint32) {
return TokenAttributes.newFace(
pickNegative(uint8(seed[0])),
pickColor(uint8(seed[1])),
pickEye(uint8(seed[2])),
pickNose(uint8(seed[3])),
pickEye(uint8(seed[4]))
);
}
function random(bytes32 uni) private view returns (bytes32) {
// Oh look, random number generation on-chain. What could go wrong?
unchecked {
uint256 bitfield;
for (uint ii = 1; ii < 257; ii++) {
uint256 bits = uint256(blockhash(block.number - ii));
bitfield |= bits & (1 << (ii - 1));
}
uint256 value = uint256(keccak256(abi.encodePacked(bytes32(bitfield))));
value ^= uint256(keccak256(abi.encodePacked(uni)));
return bytes32(value);
}
}
function roll() internal returns (uint32) {
bytes32 mem = unique;
bytes32 seed = random(mem);
bool success;
uint32 face;
while (true) {
face = pickFace(seed);
(success, mem) = takeFace(mem, face);
if (success) {
break;
}
seed = keccak256(abi.encodePacked(seed));
}
unique = mem;
return face;
}
function steal(uint32 face) internal {
bool success;
(success, unique) = takeFace(unique, face);
require(success, "nice try");
}
}
contract FaceDotPng is Attributes, ERC721, Ownable {
using TokenAttributes for uint32;
bytes constant private COLOR_VALUES = hex"cc0000f15d2264cf00006fff2222ccad7fa834e2e2";
Render immutable public RENDERER;
uint256 public price = 130000000000000;
constructor(Render renderer) ERC721("face.png", "PNG") {
RENDERER = renderer;
// My avatar.
genesisSteal(msg.sender, 0xc020000);
}
// (357 bytes)
function color(uint8 index, bool negative) private pure returns (bytes3) {
index *= 3;
uint24 result =
(uint24(uint8(COLOR_VALUES[index])) << 16)
| (uint24(uint8(COLOR_VALUES[index + 1])) << 8)
| uint24(uint8(COLOR_VALUES[index + 2]));
if (negative) {
result = ~result;
}
return bytes3(result);
}
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "PNG: nonexistent");
uint32 face = uint32(tokenId);
bool isNegative = face.faceNegative();
bytes3 bg = bytes3(isNegative ? 0xFFFFFF : 0x000000);
bytes memory png = RENDERER.png(
bg,
color(face.faceColor(), isNegative),
face.faceLeftEye(),
face.faceNose(),
face.faceRightEye()
);
bytes memory svg = abi.encodePacked(
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
"<svg version=\"1.1\" viewBox=\"0 0 48 48\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">"
"<image style=\"image-rendering:crisp-edges;image-rendering:pixelated\" xlink:href=\"data:image/png;base64,",
Base64.encode(png),
"\"/></svg>"
);
bytes memory name = abi.encodePacked(
RENDERER.eyeName(face.faceLeftEye()),
RENDERER.noseName(face.faceNose()),
RENDERER.eyeName(face.faceRightEye()),
".png"
);
bytes memory json = abi.encodePacked(
"{\"description\":\"\",\"name\":\"",
name,
"\",\"attributes\":[{\"trait_type\":\"Left Eye\",\"value\":\"",
RENDERER.eyeName(face.faceLeftEye()),
"\"},{\"trait_type\":\"Nose\",\"value\":\"",
RENDERER.noseName(face.faceNose()),
"\"},{\"trait_type\":\"Right Eye\",\"value\":\"",
RENDERER.eyeName(face.faceRightEye()),
"\"},{\"trait_type\":\"Base Color\",\"value\":\"",
face.faceColor() + 48, // Convert to ASCII digit.
"\"},{\"trait_type\":\"Negative\",\"value\":\"",
face.faceNegative() ? "Yes" : "No",
"\"}],\"image\":\"data:image/svg+xml;base64,",
Base64.encode(svg),
"\"}"
);
return string(abi.encodePacked(
"data:application/json;base64,",
Base64.encode(json)
));
}
function genesisSteal(address to, uint32 face) private {
steal(face);
_mint(to, face);
}
function preMint() private returns (uint256) {
require(msg.sender == tx.origin, "EOAs only"); // fuck 3074
require(msg.value >= price, "not enough");
price = (price * 1082) / 1000;
return roll();
}
function mint(address to) external payable {
_mint(to, preMint());
}
function safeMint(address to) external payable {
_safeMint(to, preMint());
}
function withdraw(address payable to) external onlyOwner {
(bool success,) = to.call{value:address(this).balance}("");
require(success, "could not send");
}
}
// SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.4;
library Crc32 {
bytes constant private TABLE = hex"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";
function table(uint index) private pure returns (uint32) {
unchecked {
index *= 4;
uint32 result =
uint32(uint8(TABLE[index ])) << 24;
result |= uint32(uint8(TABLE[index + 1])) << 16;
result |= uint32(uint8(TABLE[index + 2])) << 8;
result |= uint32(uint8(TABLE[index + 3]));
return result;
}
}
function crc32(bytes memory self, uint offset, uint end) internal pure {
unchecked {
uint32 crc = ~uint32(0);
for (uint ii = offset; ii < end; ii++) {
crc = (crc >> 8) ^ table((crc & 0xff) ^ uint8(self[ii]));
}
crc = ~crc;
self[end ] = bytes1(uint8(crc >> 24));
self[end + 1] = bytes1(uint8(crc >> 16));
self[end + 2] = bytes1(uint8(crc >> 8));
self[end + 3] = bytes1(uint8(crc));
}
}
}
library Adler32 {
uint32 constant private MOD = 65521;
function adler32(bytes memory self, uint offset, uint end) internal pure {
unchecked {
uint32 a = 1;
uint32 b = 0;
// Process each byte of the data in order
for (uint ii = offset; ii < end; ii++) {
a = (a + uint32(uint8(self[ii]))) % MOD;
b = (b + a) % MOD;
}
uint32 adler = (b << 16) | a;
self[end ] = bytes1(uint8(adler >> 24));
self[end + 1] = bytes1(uint8(adler >> 16));
self[end + 2] = bytes1(uint8(adler >> 8));
self[end + 3] = bytes1(uint8(adler));
}
}
}
contract Render {
using Crc32 for bytes;
using Adler32 for bytes;
uint constant private WIDTH_BYTES = 6;
uint constant private WIDTH_PIXELS = WIDTH_BYTES * 8;
uint constant private LINES = WIDTH_PIXELS;
uint constant private SPRITES_PER_IMAGE = 3;
uint constant private SPRITE_LINE_BYTES = WIDTH_BYTES / SPRITES_PER_IMAGE;
uint constant private SPRITE_BYTES = LINES * SPRITE_LINE_BYTES;
uint constant private SPRITE_LINE_MASK = 0xFFFF;
uint8 constant public EYES = 7;
bytes constant private EYES_X =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"700e"
hex"381c"
hex"1818"
hex"0c30"
hex"0e70"
hex"07e0"
hex"03c0"
hex"03c0"
hex"0660"
hex"0e70"
hex"1c30"
hex"1818"
hex"381c"
hex"700e"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private EYES_CARET =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0180"
hex"03c0"
hex"07e0"
hex"0e70"
hex"1c38"
hex"381c"
hex"700e"
hex"6006"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private EYES_O =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"07e0"
hex"0ff0"
hex"1c38"
hex"1818"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"1818"
hex"1c38"
hex"0ff0"
hex"07e0"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private EYES_0 =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"03c0"
hex"0ff0"
hex"1c38"
hex"1818"
hex"1818"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"300c"
hex"1818"
hex"1818"
hex"1c38"
hex"0ff0"
hex"03c0"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private EYES_GT =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"3800"
hex"3f00"
hex"07c0"
hex"01f8"
hex"003c"
hex"01f8"
hex"07c0"
hex"3f00"
hex"3800"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private EYES_LT =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"001c"
hex"00fc"
hex"03e0"
hex"1f80"
hex"3c00"
hex"1f80"
hex"03e0"
hex"00fc"
hex"001c"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private EYES_CRY =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0004"
hex"0004"
hex"0002"
hex"0002"
hex"0002"
hex"0006"
hex"3ffe"
hex"7ffc"
hex"0630"
hex"1818"
hex"108c"
hex"31c6"
hex"21c6"
hex"6086"
hex"6006"
hex"6006"
hex"310e"
hex"3ffc"
hex"1e78"
hex"0000"
hex"0100"
hex"0180"
hex"0380"
hex"0380"
hex"0100"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
uint8 constant public NOSES = 3;
bytes constant private NOSES_UNDERSCORE =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"7ffe"
hex"7ffe"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private NOSES_PERIOD =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0180"
hex"03c0"
hex"0180"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private NOSES_CAT =
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"1818"
hex"1818"
hex"3818"
hex"300c"
hex"300c"
hex"318c"
hex"318c"
hex"318c"
hex"318c"
hex"318c"
hex"318c"
hex"3bd8"
hex"1e78"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000"
hex"0000";
bytes constant private HEADER =
hex"89504e470d0a1a0a" // PNG Signature
hex"0000000d49484452000000300000003001030000006dcc6bc4" // IHDR Chunk
hex"00000006504c5445"; // PLTE Chunk (Partial)
bytes constant private IDAT_PREFIX =
hex"0000015b" // Chunk Length
hex"49444154" // "IDAT"
hex"7801015001affe"; // zlib header
bytes constant private TRAILER = hex"0000000049454e44ae426082"; // IEND Chunk
function eye(uint8 index) private pure returns (bytes memory) {
require(index < EYES, "eye out of range");
if (0 == index) {
return EYES_0;
} else if (1 == index) {
return EYES_CARET;
} else if (2 == index) {
return EYES_O;
} else if (3 == index) {
return EYES_X;
} else if (4 == index) {
return EYES_GT;
} else if (5 == index) {
return EYES_LT;
} else if (6 == index) {
return EYES_CRY;
} else {
assert(true);
return new bytes(0); // Unreachable?
}
}
function eyeName(uint8 index) public pure returns (string memory) {
require(index < EYES, "eye out of range");
if (0 == index) {
return "0";
} else if (1 == index) {
return "^";
} else if (2 == index) {
return "o";
} else if (3 == index) {
return "x";
} else if (4 == index) {
return ">";
} else if (5 == index) {
return "<";
} else if (6 == index) {
return "\u0ca5";
} else {
assert(true);
return new string(0); // Unreachable?
}
}
function nose(uint8 index) private pure returns (bytes memory) {
require(index < NOSES, "nose out of range");
if (0 == index) {
return NOSES_UNDERSCORE;
} else if (1 == index) {
return NOSES_PERIOD;
} else if (2 == index) {
return NOSES_CAT;
} else {
assert(true);
return new bytes(0); // Unreachable?
}
}
function noseName(uint8 index) public pure returns (string memory) {
require(index < NOSES, "nose out of range");
if (0 == index) {
return "_";
} else if (1 == index) {
return ".";
} else if (2 == index) {
return "\u03c9";
} else {
assert(true);
return new string(0); // Unreachable?
}
}
function render(bytes memory output, uint offset, uint8 leftEyeIndex, uint8 noseIndex, uint8 rightEyeIndex) private pure {
unchecked {
bytes memory sprite;
sprite = eye(leftEyeIndex);
for (uint line = 0; line < LINES; line++) {
uint inOffset = line * SPRITE_LINE_BYTES;
uint outOffset = 1 + (line * (WIDTH_BYTES + 1));
for (uint column = 0; column < SPRITE_LINE_BYTES; column++) {
output[offset + outOffset + column] = sprite[inOffset + column];
}
}
sprite = nose(noseIndex);
for (uint line = 0; line < LINES; line++) {
uint inOffset = line * SPRITE_LINE_BYTES;
uint outOffset = 1 + SPRITE_LINE_BYTES + (line * (WIDTH_BYTES + 1));
for (uint column = 0; column < SPRITE_LINE_BYTES; column++) {
output[offset + outOffset + column] = sprite[inOffset + column];
}
}
sprite = eye(rightEyeIndex);
for (uint line = 0; line < LINES; line++) {
uint inOffset = line * SPRITE_LINE_BYTES;
uint outOffset = 1 + (2 * SPRITE_LINE_BYTES) + (line * (WIDTH_BYTES + 1));
for (uint column = 0; column < SPRITE_LINE_BYTES; column++) {
output[offset + outOffset + column] = sprite[inOffset + column];
}
}
}
}
function png(bytes3 bg, bytes3 fg, uint8 leftEyeIndex, uint8 noseIndex, uint8 rightEyeIndex) external pure returns (bytes memory) {
unchecked {
uint length = HEADER.length
+ bg.length
+ fg.length
+ 4 // PLTE CRC32
+ IDAT_PREFIX.length
+ LINES * (WIDTH_BYTES + 1) // Image Data
+ 4 // zlib adler32
+ 4 // IDAT CRC32
+ TRAILER.length;
bytes memory output = new bytes(length);
uint offset = 0;
// Copy the static portion of the header.
for (uint ii = 0; ii < HEADER.length; ii++) {
output[offset++] = HEADER[ii];
}
// Copy the background color.
for (uint ii = 0; ii < bg.length; ii++) {
output[offset++] = bg[ii];
}
// Copy the foreground color.
for (uint ii = 0; ii < fg.length; ii++) {
output[offset++] = fg[ii];
}
// Compute the palette's checksum.
output.crc32(HEADER.length - 4, offset);
offset += 4;
uint idat_data_offset = offset + 4;
// Copy the IDAT prefix.
for (uint ii = 0; ii < IDAT_PREFIX.length; ii++) {
output[offset++] = IDAT_PREFIX[ii];
}
uint image_data_offset = offset;
render(output, offset, leftEyeIndex, noseIndex, rightEyeIndex);
offset += LINES * (WIDTH_BYTES + 1);
output.adler32(image_data_offset, offset);
offset += 4;
output.crc32(idat_data_offset, offset);
offset += 4;
// Copy the trailer.
for (uint ii = 0; ii < TRAILER.length; ii++) {
output[offset++] = TRAILER[ii];
}
return output;
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @title Base64
/// @author Brecht Devos - <[email protected]>
/// @notice Provides a function for encoding some bytes in base64
library Base64 {
string internal constant TABLE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
function encode(bytes memory data) internal pure returns (string memory) {
if (data.length == 0) return '';
// load the table into memory
string memory table = TABLE;
// multiply by 4/3 rounded up
uint256 encodedLen = 4 * ((data.length + 2) / 3);
// add some extra buffer at the end required for the writing
string memory result = new string(encodedLen + 32);
assembly {
// set the actual output length
mstore(result, encodedLen)
// prepare the lookup table
let tablePtr := add(table, 1)
// input ptr
let dataPtr := data
let endPtr := add(dataPtr, mload(data))
// result ptr, jump over length
let resultPtr := add(result, 32)
// run over the input, 3 bytes at a time
for {} lt(dataPtr, endPtr) {}
{
dataPtr := add(dataPtr, 3)
// read 3 bytes
let input := mload(dataPtr)
// write 4 characters
mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(18, input), 0x3F)))))
resultPtr := add(resultPtr, 1)
mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr(12, input), 0x3F)))))
resultPtr := add(resultPtr, 1)
mstore(resultPtr, shl(248, mload(add(tablePtr, and(shr( 6, input), 0x3F)))))
resultPtr := add(resultPtr, 1)
mstore(resultPtr, shl(248, mload(add(tablePtr, and( input, 0x3F)))))
resultPtr := add(resultPtr, 1)
}
// padding with '='
switch mod(mload(data), 3)
case 1 { mstore(sub(resultPtr, 2), shl(240, 0x3d3d)) }
case 2 { mstore(sub(resultPtr, 1), shl(248, 0x3d)) }
}
return result;
}
}
// SPDX-License-Identifier: MIT
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: balance query for the zero address");
return _balances[owner];
}
/**
* @dev See {IERC721-ownerOf}.
*/
function ownerOf(uint256 tokenId) public view virtual override returns (address) {
address owner = _owners[tokenId];
require(owner != address(0), "ERC721: owner query for nonexistent token");
return owner;
}
/**
* @dev See {IERC721Metadata-name}.
*/
function name() public view virtual override returns (string memory) {
return _name;
}
/**
* @dev See {IERC721Metadata-symbol}.
*/
function symbol() public view virtual override returns (string memory) {
return _symbol;
}
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
string memory 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 overriden 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 owner nor approved for all"
);
_approve(to, tokenId);
}
/**
* @dev See {IERC721-getApproved}.
*/
function getApproved(uint256 tokenId) public view virtual override returns (address) {
require(_exists(tokenId), "ERC721: approved query for nonexistent token");
return _tokenApprovals[tokenId];
}
/**
* @dev See {IERC721-setApprovalForAll}.
*/
function setApprovalForAll(address operator, bool approved) public virtual override {
require(operator != _msgSender(), "ERC721: approve to caller");
_operatorApprovals[_msgSender()][operator] = approved;
emit ApprovalForAll(_msgSender(), operator, approved);
}
/**
* @dev See {IERC721-isApprovedForAll}.
*/
function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev See {IERC721-transferFrom}.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
//solhint-disable-next-line max-line-length
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_transfer(from, to, tokenId);
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) public virtual override {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev See {IERC721-safeTransferFrom}.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes memory _data
) public virtual override {
require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
_safeTransfer(from, to, tokenId, _data);
}
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* `_data` is additional data, it has no specified format and it is sent in call to `to`.
*
* This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
* implement alternative mechanisms to perform token transfer, such as signature-based.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeTransfer(
address from,
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_transfer(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
}
/**
* @dev Returns whether `tokenId` exists.
*
* Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
*
* Tokens start existing when they are minted (`_mint`),
* and stop existing when they are burned (`_burn`).
*/
function _exists(uint256 tokenId) internal view virtual returns (bool) {
return _owners[tokenId] != address(0);
}
/**
* @dev Returns whether `spender` is allowed to manage `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
require(_exists(tokenId), "ERC721: operator query for nonexistent token");
address owner = ERC721.ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Safely mints `tokenId` and transfers it to `to`.
*
* Requirements:
*
* - `tokenId` must not exist.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function _safeMint(address to, uint256 tokenId) internal virtual {
_safeMint(to, tokenId, "");
}
/**
* @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
* forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
*/
function _safeMint(
address to,
uint256 tokenId,
bytes memory _data
) internal virtual {
_mint(to, tokenId);
require(
_checkOnERC721Received(address(0), to, tokenId, _data),
"ERC721: transfer to non ERC721Receiver implementer"
);
}
/**
* @dev Mints `tokenId` and transfers it to `to`.
*
* WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
*
* Requirements:
*
* - `tokenId` must not exist.
* - `to` cannot be the zero address.
*
* Emits a {Transfer} event.
*/
function _mint(address to, uint256 tokenId) internal virtual {
require(to != address(0), "ERC721: mint to the zero address");
require(!_exists(tokenId), "ERC721: token already minted");
_beforeTokenTransfer(address(0), to, tokenId);
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Destroys `tokenId`.
* The approval is cleared when the token is burned.
*
* Requirements:
*
* - `tokenId` must exist.
*
* Emits a {Transfer} event.
*/
function _burn(uint256 tokenId) internal virtual {
address owner = ERC721.ownerOf(tokenId);
_beforeTokenTransfer(owner, address(0), tokenId);
// Clear approvals
_approve(address(0), tokenId);
_balances[owner] -= 1;
delete _owners[tokenId];
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Transfers `tokenId` from `from` to `to`.
* As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
*
* Requirements:
*
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
*
* Emits a {Transfer} event.
*/
function _transfer(
address from,
address to,
uint256 tokenId
) internal virtual {
require(ERC721.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
require(to != address(0), "ERC721: transfer to the zero address");
_beforeTokenTransfer(from, to, tokenId);
// Clear approvals from the previous owner
_approve(address(0), tokenId);
_balances[from] -= 1;
_balances[to] += 1;
_owners[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Approve `to` to operate on `tokenId`
*
* Emits a {Approval} event.
*/
function _approve(address to, uint256 tokenId) internal virtual {
_tokenApprovals[tokenId] = to;
emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
}
/**
* @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
* The call is not executed if the target address is not a contract.
*
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(
address from,
address to,
uint256 tokenId,
bytes memory _data
) private returns (bool) {
if (to.isContract()) {
try IERC721Receiver(to).onERC721Received(_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 {
assembly {
revert(add(32, reason), mload(reason))
}
}
}
} else {
return true;
}
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` and `to` are never both zero.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual {}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
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
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// SPDX-License-Identifier: MIT
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
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason 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 {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
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
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 `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
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`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @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);
}