Contract Source Code:
//Contract based on [https://docs.openzeppelin.com/contracts/3.x/erc721](https://docs.openzeppelin.com/contracts/3.x/erc721)
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721URIStorage.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "./string.sol";
contract web3domain is Ownable, ERC721, ERC721URIStorage, ERC721Enumerable {
using strings for *;
uint256 private nft_price = 100;
uint256 private nft_comm_web3 = 40;
uint256 private nft_comm_dealer = 60;
struct Metadata {
uint256 id;
string title;
uint256 allow;
}
mapping(uint256 => Metadata) id_to_date;
mapping(string => Metadata) id_to_title;
mapping(uint256 => Metadata) id_to_allow;
function setNftPrice(uint256 _nft_price) public onlyOwner {
nft_price = _nft_price;
}
function getNftPrice() public view returns (uint256) {
return nft_price;
}
function set_Comm_Web3(uint256 _nft_comm_web3) public onlyOwner {
nft_comm_web3 = _nft_comm_web3;
}
function getComm_Web3() public view returns (uint256) {
return nft_comm_web3;
}
function set_Comm_Dealer(uint256 _nft_comm_dealer) public onlyOwner {
nft_comm_dealer = _nft_comm_dealer;
}
function getComm_Dealer() public view returns (uint256) {
return nft_comm_dealer;
}
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal override(ERC721, ERC721Enumerable) {
super._beforeTokenTransfer(from, to, tokenId);
}
function supportsInterface(bytes4 interfaceId)
public
view
override(ERC721, ERC721Enumerable)
returns (bool)
{
return super.supportsInterface(interfaceId);
}
function setTokenURI(uint256 tokenId, string memory tokenURIlink)
external
payable
{
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
_setTokenURI(tokenId, tokenURIlink);
payable(owner()).transfer(msg.value);
}
function _burn(uint256 tokenId)
internal
override(ERC721, ERC721URIStorage)
{
super._burn(tokenId);
}
function tokenURI(uint256 tokenId)
public
view
override(ERC721, ERC721URIStorage)
returns (string memory)
{
return super.tokenURI(tokenId);
}
function mint(
uint256 _id,
string memory title,
string memory _tokenUri
) internal {
require(!_exists(_id), "Domain restricted to register");
require(
!_exists_title(_toLowerCase(title)),
"Domain already registered"
);
uint256 tokenId = _id;
uint256 allow = 5;
id_to_date[tokenId] = Metadata(_id, _toLowerCase(title), allow);
id_to_title[_toLowerCase(title)] = Metadata(
_id,
_toLowerCase(title),
allow
);
id_to_allow[tokenId] = Metadata(_id, _toLowerCase(title), allow);
_safeMint(msg.sender, tokenId);
_setTokenURI(tokenId, _tokenUri);
}
function _exists_title(string memory title) internal view returns (bool) {
Metadata memory tt = id_to_title[title];
uint256 _title_id = tt.id;
if (_title_id != 0) {
return true;
} else {
return false;
}
}
function titleOf(uint256 tokenId) external view returns (string memory) {
require(_exists(tokenId), "Domain not minted");
Metadata memory date = id_to_date[tokenId];
return date.title;
}
function getID(string memory title) public view returns (string memory) {
Metadata memory tt = id_to_title[_toLowerCase(title)];
require(_exists(tt.id), "Domain not minted");
return Strings.toString(tt.id);
}
function getint(string memory title) internal view returns (uint256) {
Metadata memory tt = id_to_title[_toLowerCase(title)];
require(_exists(tt.id), "Domain not minted");
return tt.id;
}
function getOwner(uint256 tokenId) public view returns (address) {
return ownerOf(tokenId);
}
function claim(
uint256 tokenId,
string calldata title,
string memory _tokenUri
) external payable {
string memory primary = subdomain(_toLowerCase(title), 2);
uint256 level = getNftPrice();
if (keccak256(bytes(primary)) != keccak256(bytes(""))) {
uint256 iid = getint(primary);
level = getAllow(iid);
if (getAllow(iid) == 0) {
require(
msg.sender == getOwner(iid),
"Primary domain owner can only mint sub-domain"
);
payable(owner()).transfer(msg.value);
} else {
payable(getOwner(iid)).transfer((msg.value * getComm_Dealer()) / 100);
payable(owner()).transfer((msg.value * getComm_Web3()) / 100);
}
} else {
payable(owner()).transfer(msg.value);
}
uint256 listingPrice = level * 1 ether;
require(
msg.value >= listingPrice,
"Price must be equal to listing price"
);
require(tokenId > 0, "Token ID cannot be 0");
require(bytes(title).length > 0, "Domain name cannot be blank");
mint(tokenId, _toLowerCase(title), _tokenUri);
}
function getBalance() public view returns (uint256) {
return address(this).balance;
}
/**
* @dev Lowercase a string.
* @param _str - to be converted to string.
* @return string
*/
function _toLowerCase(string memory _str)
internal
pure
returns (string memory)
{
bytes memory bStr = bytes(_str);
bytes memory bLower = new bytes(bStr.length);
for (uint256 i = 0; i < bStr.length; i++) {
// Uppercase character...
if ((bStr[i] >= 0x41) && (bStr[i] <= 0x5A)) {
// So we add 0x20 to make it lowercase
bLower[i] = bytes1(uint8(bStr[i]) + 0x20);
} else {
bLower[i] = bStr[i];
}
}
return string(bLower);
}
constructor() ERC721("web3domain", "Web3Domain.org") {
// mint(0, "");
}
function subdomain(string memory title, uint256 pos)
internal
pure
returns (string memory)
{
strings.slice memory s = title.toSlice();
strings.slice memory part;
string memory a = s.split(".".toSlice(), part).toString(); // part and return value is "www"
string memory b = s.split(".".toSlice(), part).toString(); // part and return value is "yyy"
if (pos == 1) {
return a;
} else {
return b;
}
}
function setAllow(uint256 tokenId, uint256 _allow) external payable {
require(_exists(tokenId), "Domain not minted");
require(
_isApprovedOrOwner(_msgSender(), tokenId),
"ERC721: transfer caller is not owner nor approved"
);
Metadata memory date = id_to_date[tokenId];
id_to_allow[tokenId] = Metadata(tokenId, date.title, _allow);
}
function getAllow(uint256 tokenId) public view returns (uint256) {
require(_exists(tokenId), "Domain not minted");
Metadata memory date = id_to_allow[tokenId];
return date.allow;
}
function withdraw() public onlyOwner {
payable(owner()).transfer(address(this).balance);
}
}
//Contract based on [https://docs.openzeppelin.com/contracts/3.x/erc721](https://docs.openzeppelin.com/contracts/3.x/erc721)
// SPDX-License-Identifier: MIT
//I am Navneet Gupta :)
/*
* @title String & slice utility library for Solidity contracts.
* @author Nick Johnson <[email protected]>
*
* @dev Functionality in this library is largely implemented using an
* abstraction called a 'slice'. A slice represents a part of a string -
* anything from the entire string to a single character, or even no
* characters at all (a 0-length slice). Since a slice only has to specify
* an offset and a length, copying and manipulating slices is a lot less
* expensive than copying and manipulating the strings they reference.
*
* To further reduce gas costs, most functions on slice that need to return
* a slice modify the original one instead of allocating a new one; for
* instance, `s.split(".")` will return the text up to the first '.',
* modifying s to only contain the remainder of the string after the '.'.
* In situations where you do not want to modify the original slice, you
* can make a copy first with `.copy()`, for example:
* `s.copy().split(".")`. Try and avoid using this idiom in loops; since
* Solidity has no memory management, it will result in allocating many
* short-lived slices that are later discarded.
*
* Functions that return two slices come in two versions: a non-allocating
* version that takes the second slice as an argument, modifying it in
* place, and an allocating version that allocates and returns the second
* slice; see `nextRune` for example.
*
* Functions that have to copy string data will return strings rather than
* slices; these can be cast back to slices for further processing if
* required.
*
* For convenience, some functions are provided with non-modifying
* variants that create a new slice and return both; for instance,
* `s.splitNew('.')` leaves s unmodified, and returns two values
* corresponding to the left and right parts of the string.
*/
pragma solidity ^0.8.0;
library strings {
struct slice {
uint _len;
uint _ptr;
}
function memcpy(uint dest, uint src, uint len1) private pure {
// Copy word-length chunks while possible
for(; len1 >= 32; len1 -= 32) {
assembly {
mstore(dest, mload(src))
}
dest += 32;
src += 32;
}
// Copy remaining bytes
uint mask = type(uint).max;
if (len1 > 0) {
mask = 256 ** (32 - len1) - 1;
}
assembly {
let srcpart := and(mload(src), not(mask))
let destpart := and(mload(dest), mask)
mstore(dest, or(destpart, srcpart))
}
}
/*
* @dev Returns a slice containing the entire string.
* @param self The string to make a slice from.
* @return A newly allocated slice containing the entire string.
*/
function toSlice(string memory self) internal pure returns (slice memory) {
uint ptr;
assembly {
ptr := add(self, 0x20)
}
return slice(bytes(self).length, ptr);
}
/*
* @dev Returns the length of a null-terminated bytes32 string.
* @param self The value to find the length of.
* @return The length of the string, from 0 to 32.
*/
function len(bytes32 self) internal pure returns (uint) {
uint ret;
if (self == 0)
return 0;
if (uint(self) & type(uint128).max == 0) {
ret += 16;
self = bytes32(uint(self) / 0x100000000000000000000000000000000);
}
if (uint(self) & type(uint64).max == 0) {
ret += 8;
self = bytes32(uint(self) / 0x10000000000000000);
}
if (uint(self) & type(uint32).max == 0) {
ret += 4;
self = bytes32(uint(self) / 0x100000000);
}
if (uint(self) & type(uint16).max == 0) {
ret += 2;
self = bytes32(uint(self) / 0x10000);
}
if (uint(self) & type(uint8).max == 0) {
ret += 1;
}
return 32 - ret;
}
/*
* @dev Returns a slice containing the entire bytes32, interpreted as a
* null-terminated utf-8 string.
* @param self The bytes32 value to convert to a slice.
* @return A new slice containing the value of the input argument up to the
* first null.
*/
function toSliceB32(bytes32 self) internal pure returns (slice memory ret) {
// Allocate space for `self` in memory, copy it there, and point ret at it
assembly {
let ptr := mload(0x40)
mstore(0x40, add(ptr, 0x20))
mstore(ptr, self)
mstore(add(ret, 0x20), ptr)
}
ret._len = len(self);
}
/*
* @dev Returns a new slice containing the same data as the current slice.
* @param self The slice to copy.
* @return A new slice containing the same data as `self`.
*/
function copy(slice memory self) internal pure returns (slice memory) {
return slice(self._len, self._ptr);
}
/*
* @dev Copies a slice to a new string.
* @param self The slice to copy.
* @return A newly allocated string containing the slice's text.
*/
function toString(slice memory self) internal pure returns (string memory) {
string memory ret = new string(self._len);
uint retptr;
assembly { retptr := add(ret, 32) }
memcpy(retptr, self._ptr, self._len);
return ret;
}
/*
* @dev Returns the length in runes of the slice. Note that this operation
* takes time proportional to the length of the slice; avoid using it
* in loops, and call `slice.empty()` if you only need to know whether
* the slice is empty or not.
* @param self The slice to operate on.
* @return The length of the slice in runes.
*/
function len(slice memory self) internal pure returns (uint l) {
// Starting at ptr-31 means the LSB will be the byte we care about
uint ptr = self._ptr - 31;
uint end = ptr + self._len;
for (l = 0; ptr < end; l++) {
uint8 b;
assembly { b := and(mload(ptr), 0xFF) }
if (b < 0x80) {
ptr += 1;
} else if(b < 0xE0) {
ptr += 2;
} else if(b < 0xF0) {
ptr += 3;
} else if(b < 0xF8) {
ptr += 4;
} else if(b < 0xFC) {
ptr += 5;
} else {
ptr += 6;
}
}
}
/*
* @dev Returns true if the slice is empty (has a length of 0).
* @param self The slice to operate on.
* @return True if the slice is empty, False otherwise.
*/
function empty(slice memory self) internal pure returns (bool) {
return self._len == 0;
}
/*
* @dev Returns a positive number if `other` comes lexicographically after
* `self`, a negative number if it comes before, or zero if the
* contents of the two slices are equal. Comparison is done per-rune,
* on unicode codepoints.
* @param self The first slice to compare.
* @param other The second slice to compare.
* @return The result of the comparison.
*/
function compare(slice memory self, slice memory other) internal pure returns (int) {
uint shortest = self._len;
if (other._len < self._len)
shortest = other._len;
uint selfptr = self._ptr;
uint otherptr = other._ptr;
for (uint idx = 0; idx < shortest; idx += 32) {
uint a;
uint b;
assembly {
a := mload(selfptr)
b := mload(otherptr)
}
if (a != b) {
// Mask out irrelevant bytes and check again
uint mask = type(uint).max; // 0xffff...
if(shortest < 32) {
mask = ~(2 ** (8 * (32 - shortest + idx)) - 1);
}
unchecked {
uint diff = (a & mask) - (b & mask);
if (diff != 0)
return int(diff);
}
}
selfptr += 32;
otherptr += 32;
}
return int(self._len) - int(other._len);
}
/*
* @dev Returns true if the two slices contain the same text.
* @param self The first slice to compare.
* @param self The second slice to compare.
* @return True if the slices are equal, false otherwise.
*/
function equals(slice memory self, slice memory other) internal pure returns (bool) {
return compare(self, other) == 0;
}
/*
* @dev Extracts the first rune in the slice into `rune`, advancing the
* slice to point to the next rune and returning `self`.
* @param self The slice to operate on.
* @param rune The slice that will contain the first rune.
* @return `rune`.
*/
function nextRune(slice memory self, slice memory rune) internal pure returns (slice memory) {
rune._ptr = self._ptr;
if (self._len == 0) {
rune._len = 0;
return rune;
}
uint l;
uint b;
// Load the first byte of the rune into the LSBs of b
assembly { b := and(mload(sub(mload(add(self, 32)), 31)), 0xFF) }
if (b < 0x80) {
l = 1;
} else if(b < 0xE0) {
l = 2;
} else if(b < 0xF0) {
l = 3;
} else {
l = 4;
}
// Check for truncated codepoints
if (l > self._len) {
rune._len = self._len;
self._ptr += self._len;
self._len = 0;
return rune;
}
self._ptr += l;
self._len -= l;
rune._len = l;
return rune;
}
/*
* @dev Returns the first rune in the slice, advancing the slice to point
* to the next rune.
* @param self The slice to operate on.
* @return A slice containing only the first rune from `self`.
*/
function nextRune(slice memory self) internal pure returns (slice memory ret) {
nextRune(self, ret);
}
/*
* @dev Returns the number of the first codepoint in the slice.
* @param self The slice to operate on.
* @return The number of the first codepoint in the slice.
*/
function ord(slice memory self) internal pure returns (uint ret) {
if (self._len == 0) {
return 0;
}
uint word;
uint length;
uint divisor = 2 ** 248;
// Load the rune into the MSBs of b
assembly { word:= mload(mload(add(self, 32))) }
uint b = word / divisor;
if (b < 0x80) {
ret = b;
length = 1;
} else if(b < 0xE0) {
ret = b & 0x1F;
length = 2;
} else if(b < 0xF0) {
ret = b & 0x0F;
length = 3;
} else {
ret = b & 0x07;
length = 4;
}
// Check for truncated codepoints
if (length > self._len) {
return 0;
}
for (uint i = 1; i < length; i++) {
divisor = divisor / 256;
b = (word / divisor) & 0xFF;
if (b & 0xC0 != 0x80) {
// Invalid UTF-8 sequence
return 0;
}
ret = (ret * 64) | (b & 0x3F);
}
return ret;
}
/*
* @dev Returns the keccak-256 hash of the slice.
* @param self The slice to hash.
* @return The hash of the slice.
*/
function keccak(slice memory self) internal pure returns (bytes32 ret) {
assembly {
ret := keccak256(mload(add(self, 32)), mload(self))
}
}
/*
* @dev Returns true if `self` starts with `needle`.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return True if the slice starts with the provided text, false otherwise.
*/
function startsWith(slice memory self, slice memory needle) internal pure returns (bool) {
if (self._len < needle._len) {
return false;
}
if (self._ptr == needle._ptr) {
return true;
}
bool equal;
assembly {
let length := mload(needle)
let selfptr := mload(add(self, 0x20))
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
return equal;
}
/*
* @dev If `self` starts with `needle`, `needle` is removed from the
* beginning of `self`. Otherwise, `self` is unmodified.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return `self`
*/
function beyond(slice memory self, slice memory needle) internal pure returns (slice memory) {
if (self._len < needle._len) {
return self;
}
bool equal = true;
if (self._ptr != needle._ptr) {
assembly {
let length := mload(needle)
let selfptr := mload(add(self, 0x20))
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
}
if (equal) {
self._len -= needle._len;
self._ptr += needle._len;
}
return self;
}
/*
* @dev Returns true if the slice ends with `needle`.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return True if the slice starts with the provided text, false otherwise.
*/
function endsWith(slice memory self, slice memory needle) internal pure returns (bool) {
if (self._len < needle._len) {
return false;
}
uint selfptr = self._ptr + self._len - needle._len;
if (selfptr == needle._ptr) {
return true;
}
bool equal;
assembly {
let length := mload(needle)
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
return equal;
}
/*
* @dev If `self` ends with `needle`, `needle` is removed from the
* end of `self`. Otherwise, `self` is unmodified.
* @param self The slice to operate on.
* @param needle The slice to search for.
* @return `self`
*/
function until(slice memory self, slice memory needle) internal pure returns (slice memory) {
if (self._len < needle._len) {
return self;
}
uint selfptr = self._ptr + self._len - needle._len;
bool equal = true;
if (selfptr != needle._ptr) {
assembly {
let length := mload(needle)
let needleptr := mload(add(needle, 0x20))
equal := eq(keccak256(selfptr, length), keccak256(needleptr, length))
}
}
if (equal) {
self._len -= needle._len;
}
return self;
}
// Returns the memory address of the first byte of the first occurrence of
// `needle` in `self`, or the first byte after `self` if not found.
function findPtr(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns (uint) {
uint ptr = selfptr;
uint idx;
if (needlelen <= selflen) {
if (needlelen <= 32) {
bytes32 mask;
if (needlelen > 0) {
mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));
}
bytes32 needledata;
assembly { needledata := and(mload(needleptr), mask) }
uint end = selfptr + selflen - needlelen;
bytes32 ptrdata;
assembly { ptrdata := and(mload(ptr), mask) }
while (ptrdata != needledata) {
if (ptr >= end)
return selfptr + selflen;
ptr++;
assembly { ptrdata := and(mload(ptr), mask) }
}
return ptr;
} else {
// For long needles, use hashing
bytes32 hash;
assembly { hash := keccak256(needleptr, needlelen) }
for (idx = 0; idx <= selflen - needlelen; idx++) {
bytes32 testHash;
assembly { testHash := keccak256(ptr, needlelen) }
if (hash == testHash)
return ptr;
ptr += 1;
}
}
}
return selfptr + selflen;
}
// Returns the memory address of the first byte after the last occurrence of
// `needle` in `self`, or the address of `self` if not found.
function rfindPtr(uint selflen, uint selfptr, uint needlelen, uint needleptr) private pure returns (uint) {
uint ptr;
if (needlelen <= selflen) {
if (needlelen <= 32) {
bytes32 mask;
if (needlelen > 0) {
mask = bytes32(~(2 ** (8 * (32 - needlelen)) - 1));
}
bytes32 needledata;
assembly { needledata := and(mload(needleptr), mask) }
ptr = selfptr + selflen - needlelen;
bytes32 ptrdata;
assembly { ptrdata := and(mload(ptr), mask) }
while (ptrdata != needledata) {
if (ptr <= selfptr)
return selfptr;
ptr--;
assembly { ptrdata := and(mload(ptr), mask) }
}
return ptr + needlelen;
} else {
// For long needles, use hashing
bytes32 hash;
assembly { hash := keccak256(needleptr, needlelen) }
ptr = selfptr + (selflen - needlelen);
while (ptr >= selfptr) {
bytes32 testHash;
assembly { testHash := keccak256(ptr, needlelen) }
if (hash == testHash)
return ptr + needlelen;
ptr -= 1;
}
}
}
return selfptr;
}
/*
* @dev Modifies `self` to contain everything from the first occurrence of
* `needle` to the end of the slice. `self` is set to the empty slice
* if `needle` is not found.
* @param self The slice to search and modify.
* @param needle The text to search for.
* @return `self`.
*/
function find(slice memory self, slice memory needle) internal pure returns (slice memory) {
uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr);
self._len -= ptr - self._ptr;
self._ptr = ptr;
return self;
}
/*
* @dev Modifies `self` to contain the part of the string from the start of
* `self` to the end of the first occurrence of `needle`. If `needle`
* is not found, `self` is set to the empty slice.
* @param self The slice to search and modify.
* @param needle The text to search for.
* @return `self`.
*/
function rfind(slice memory self, slice memory needle) internal pure returns (slice memory) {
uint ptr = rfindPtr(self._len, self._ptr, needle._len, needle._ptr);
self._len = ptr - self._ptr;
return self;
}
/*
* @dev Splits the slice, setting `self` to everything after the first
* occurrence of `needle`, and `token` to everything before it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and `token` is set to the entirety of `self`.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @param token An output parameter to which the first token is written.
* @return `token`.
*/
function split(slice memory self, slice memory needle, slice memory token) internal pure returns (slice memory) {
uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr);
token._ptr = self._ptr;
token._len = ptr - self._ptr;
if (ptr == self._ptr + self._len) {
// Not found
self._len = 0;
} else {
self._len -= token._len + needle._len;
self._ptr = ptr + needle._len;
}
return token;
}
/*
* @dev Splits the slice, setting `self` to everything after the first
* occurrence of `needle`, and returning everything before it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and the entirety of `self` is returned.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @return The part of `self` up to the first occurrence of `delim`.
*/
function split(slice memory self, slice memory needle) internal pure returns (slice memory token) {
split(self, needle, token);
}
/*
* @dev Splits the slice, setting `self` to everything before the last
* occurrence of `needle`, and `token` to everything after it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and `token` is set to the entirety of `self`.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @param token An output parameter to which the first token is written.
* @return `token`.
*/
function rsplit(slice memory self, slice memory needle, slice memory token) internal pure returns (slice memory) {
uint ptr = rfindPtr(self._len, self._ptr, needle._len, needle._ptr);
token._ptr = ptr;
token._len = self._len - (ptr - self._ptr);
if (ptr == self._ptr) {
// Not found
self._len = 0;
} else {
self._len -= token._len + needle._len;
}
return token;
}
/*
* @dev Splits the slice, setting `self` to everything before the last
* occurrence of `needle`, and returning everything after it. If
* `needle` does not occur in `self`, `self` is set to the empty slice,
* and the entirety of `self` is returned.
* @param self The slice to split.
* @param needle The text to search for in `self`.
* @return The part of `self` after the last occurrence of `delim`.
*/
function rsplit(slice memory self, slice memory needle) internal pure returns (slice memory token) {
rsplit(self, needle, token);
}
/*
* @dev Counts the number of nonoverlapping occurrences of `needle` in `self`.
* @param self The slice to search.
* @param needle The text to search for in `self`.
* @return The number of occurrences of `needle` found in `self`.
*/
function count(slice memory self, slice memory needle) internal pure returns (uint cnt) {
uint ptr = findPtr(self._len, self._ptr, needle._len, needle._ptr) + needle._len;
while (ptr <= self._ptr + self._len) {
cnt++;
ptr = findPtr(self._len - (ptr - self._ptr), ptr, needle._len, needle._ptr) + needle._len;
}
}
/*
* @dev Returns True if `self` contains `needle`.
* @param self The slice to search.
* @param needle The text to search for in `self`.
* @return True if `needle` is found in `self`, false otherwise.
*/
function contains(slice memory self, slice memory needle) internal pure returns (bool) {
return rfindPtr(self._len, self._ptr, needle._len, needle._ptr) != self._ptr;
}
/*
* @dev Returns a newly allocated string containing the concatenation of
* `self` and `other`.
* @param self The first slice to concatenate.
* @param other The second slice to concatenate.
* @return The concatenation of the two strings.
*/
function concat(slice memory self, slice memory other) internal pure returns (string memory) {
string memory ret = new string(self._len + other._len);
uint retptr;
assembly { retptr := add(ret, 32) }
memcpy(retptr, self._ptr, self._len);
memcpy(retptr + self._len, other._ptr, other._len);
return ret;
}
/*
* @dev Joins an array of slices, using `self` as a delimiter, returning a
* newly allocated string.
* @param self The delimiter to use.
* @param parts A list of slices to join.
* @return A newly allocated string containing all the slices in `parts`,
* joined with `self`.
*/
function join(slice memory self, slice[] memory parts) internal pure returns (string memory) {
if (parts.length == 0)
return "";
uint length = self._len * (parts.length - 1);
for(uint i = 0; i < parts.length; i++)
length += parts[i]._len;
string memory ret = new string(length);
uint retptr;
assembly { retptr := add(ret, 32) }
for(uint i = 0; i < parts.length; i++) {
memcpy(retptr, parts[i]._ptr, parts[i]._len);
retptr += parts[i]._len;
if (i < parts.length - 1) {
memcpy(retptr, self._ptr, self._len);
retptr += self._len;
}
}
return ret;
}
}
// 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);
}
// 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;
import "../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Enumerable is IERC721 {
/**
* @dev Returns the total amount of tokens stored by the contract.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns a token ID owned by `owner` at a given `index` of its token list.
* Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);
/**
* @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
* Use along with {totalSupply} to enumerate all tokens.
*/
function tokenByIndex(uint256 index) external view returns (uint256);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../ERC721.sol";
/**
* @dev ERC721 token with storage based token URI management.
*/
abstract contract ERC721URIStorage is ERC721 {
using Strings for uint256;
// Optional mapping for token URIs
mapping(uint256 => string) private _tokenURIs;
/**
* @dev See {IERC721Metadata-tokenURI}.
*/
function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
require(_exists(tokenId), "ERC721URIStorage: URI query for nonexistent token");
string memory _tokenURI = _tokenURIs[tokenId];
string memory base = _baseURI();
// If there is no base URI, return the token URI.
if (bytes(base).length == 0) {
return _tokenURI;
}
// If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
if (bytes(_tokenURI).length > 0) {
return string(abi.encodePacked(base, _tokenURI));
}
return super.tokenURI(tokenId);
}
/**
* @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
require(_exists(tokenId), "ERC721URIStorage: URI set of nonexistent token");
_tokenURIs[tokenId] = _tokenURI;
}
/**
* @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 override {
super._burn(tokenId);
if (bytes(_tokenURIs[tokenId]).length != 0) {
delete _tokenURIs[tokenId];
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../ERC721.sol";
import "./IERC721Enumerable.sol";
/**
* @dev This implements an optional extension of {ERC721} defined in the EIP that adds
* enumerability of all the token ids in the contract as well as all token ids owned by each
* account.
*/
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => mapping(uint256 => uint256)) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
}
/**
* @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
return _ownedTokens[owner][index];
}
/**
* @dev See {IERC721Enumerable-totalSupply}.
*/
function totalSupply() public view virtual override returns (uint256) {
return _allTokens.length;
}
/**
* @dev See {IERC721Enumerable-tokenByIndex}.
*/
function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
require(index < ERC721Enumerable.totalSupply(), "ERC721Enumerable: global index out of bounds");
return _allTokens[index];
}
/**
* @dev Hook that is called before any token transfer. This includes minting
* and burning.
*
* Calling conditions:
*
* - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
* transferred to `to`.
* - When `from` is zero, `tokenId` will be minted for `to`.
* - When `to` is zero, ``from``'s `tokenId` will be burned.
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
*
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
*/
function _beforeTokenTransfer(
address from,
address to,
uint256 tokenId
) internal virtual override {
super._beforeTokenTransfer(from, to, tokenId);
if (from == address(0)) {
_addTokenToAllTokensEnumeration(tokenId);
} else if (from != to) {
_removeTokenFromOwnerEnumeration(from, tokenId);
}
if (to == address(0)) {
_removeTokenFromAllTokensEnumeration(tokenId);
} else if (to != from) {
_addTokenToOwnerEnumeration(to, tokenId);
}
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @param to address representing the new owner of the given token ID
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
uint256 length = ERC721.balanceOf(to);
_ownedTokens[to][length] = tokenId;
_ownedTokensIndex[tokenId] = length;
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @param from address representing the previous owner of the given token ID
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
delete _ownedTokensIndex[tokenId];
delete _ownedTokens[from][lastTokenIndex];
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length - 1;
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
delete _allTokensIndex[tokenId];
_allTokens.pop();
}
}
// 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;
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);
}
}