Created
September 21, 2018 07:01
-
-
Save viswanathkgp12/c6026d768ca9efe75a7dc756c323ca4e to your computer and use it in GitHub Desktop.
Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.25+commit.59dbf8f1.js&optimize=true&gist=
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
/** | |
* Utility library of inline functions on addresses | |
*/ | |
library Address { | |
/** | |
* Returns whether the target address is a contract | |
* @dev This function will return false if invoked during the constructor of a contract, | |
* as the code is not actually created until after the constructor finishes. | |
* @param account address of the account to check | |
* @return whether the target address is a contract | |
*/ | |
function isContract(address account) internal view returns (bool) { | |
uint256 size; | |
// XXX Currently there is no better way to check if there is a contract in an address | |
// than to check the size of the code at that address. | |
// See https://ethereum.stackexchange.com/a/14016/36603 | |
// for more details about how this works. | |
// TODO Check this again before the Serenity release, because all addresses will be | |
// contracts then. | |
// solium-disable-next-line security/no-inline-assembly | |
assembly { size := extcodesize(account) } | |
return size > 0; | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.19; | |
library BytesLib { | |
function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes) { | |
bytes memory tempBytes; | |
assembly { | |
// Get a location of some free memory and store it in tempBytes as | |
// Solidity does for memory variables. | |
tempBytes := mload(0x40) | |
// Store the length of the first bytes array at the beginning of | |
// the memory for tempBytes. | |
let length := mload(_preBytes) | |
mstore(tempBytes, length) | |
// Maintain a memory counter for the current write location in the | |
// temp bytes array by adding the 32 bytes for the array length to | |
// the starting location. | |
let mc := add(tempBytes, 0x20) | |
// Stop copying when the memory counter reaches the length of the | |
// first bytes array. | |
let end := add(mc, length) | |
for { | |
// Initialize a copy counter to the start of the _preBytes data, | |
// 32 bytes into its memory. | |
let cc := add(_preBytes, 0x20) | |
} lt(mc, end) { | |
// Increase both counters by 32 bytes each iteration. | |
mc := add(mc, 0x20) | |
cc := add(cc, 0x20) | |
} { | |
// Write the _preBytes data into the tempBytes memory 32 bytes | |
// at a time. | |
mstore(mc, mload(cc)) | |
} | |
// Add the length of _postBytes to the current length of tempBytes | |
// and store it as the new length in the first 32 bytes of the | |
// tempBytes memory. | |
length := mload(_postBytes) | |
mstore(tempBytes, add(length, mload(tempBytes))) | |
// Move the memory counter back from a multiple of 0x20 to the | |
// actual end of the _preBytes data. | |
mc := end | |
// Stop copying when the memory counter reaches the new combined | |
// length of the arrays. | |
end := add(mc, length) | |
for { | |
let cc := add(_postBytes, 0x20) | |
} lt(mc, end) { | |
mc := add(mc, 0x20) | |
cc := add(cc, 0x20) | |
} { | |
mstore(mc, mload(cc)) | |
} | |
// Update the free-memory pointer by padding our last write location | |
// to 32 bytes: add 31 bytes to the end of tempBytes to move to the | |
// next 32 byte block, then round down to the nearest multiple of | |
// 32. If the sum of the length of the two arrays is zero then add | |
// one before rounding down to leave a blank 32 bytes (the length block with 0). | |
mstore(0x40, and( | |
add(add(end, iszero(add(length, mload(_preBytes)))), 31), | |
not(31) // Round down to the nearest 32 bytes. | |
)) | |
} | |
return tempBytes; | |
} | |
function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal { | |
assembly { | |
// Read the first 32 bytes of _preBytes storage, which is the length | |
// of the array. (We don't need to use the offset into the slot | |
// because arrays use the entire slot.) | |
let fslot := sload(_preBytes_slot) | |
// Arrays of 31 bytes or less have an even value in their slot, | |
// while longer arrays have an odd value. The actual length is | |
// the slot divided by two for odd values, and the lowest order | |
// byte divided by two for even values. | |
// If the slot is even, bitwise and the slot with 255 and divide by | |
// two to get the length. If the slot is odd, bitwise and the slot | |
// with -1 and divide by two. | |
let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) | |
let mlength := mload(_postBytes) | |
let newlength := add(slength, mlength) | |
// slength can contain both the length and contents of the array | |
// if length < 32 bytes so let's prepare for that | |
// v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage | |
switch add(lt(slength, 32), lt(newlength, 32)) | |
case 2 { | |
// Since the new array still fits in the slot, we just need to | |
// update the contents of the slot. | |
// uint256(bytes_storage) = uint256(bytes_storage) + uint256(bytes_memory) + new_length | |
sstore( | |
_preBytes_slot, | |
// all the modifications to the slot are inside this | |
// next block | |
add( | |
// we can just add to the slot contents because the | |
// bytes we want to change are the LSBs | |
fslot, | |
add( | |
mul( | |
div( | |
// load the bytes from memory | |
mload(add(_postBytes, 0x20)), | |
// zero all bytes to the right | |
exp(0x100, sub(32, mlength)) | |
), | |
// and now shift left the number of bytes to | |
// leave space for the length in the slot | |
exp(0x100, sub(32, newlength)) | |
), | |
// increase length by the double of the memory | |
// bytes length | |
mul(mlength, 2) | |
) | |
) | |
) | |
} | |
case 1 { | |
// The stored value fits in the slot, but the combined value | |
// will exceed it. | |
// get the keccak hash to get the contents of the array | |
mstore(0x0, _preBytes_slot) | |
let sc := add(keccak256(0x0, 0x20), div(slength, 32)) | |
// save new length | |
sstore(_preBytes_slot, add(mul(newlength, 2), 1)) | |
// The contents of the _postBytes array start 32 bytes into | |
// the structure. Our first read should obtain the `submod` | |
// bytes that can fit into the unused space in the last word | |
// of the stored array. To get this, we read 32 bytes starting | |
// from `submod`, so the data we read overlaps with the array | |
// contents by `submod` bytes. Masking the lowest-order | |
// `submod` bytes allows us to add that value directly to the | |
// stored value. | |
let submod := sub(32, slength) | |
let mc := add(_postBytes, submod) | |
let end := add(_postBytes, mlength) | |
let mask := sub(exp(0x100, submod), 1) | |
sstore( | |
sc, | |
add( | |
and( | |
fslot, | |
0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff00 | |
), | |
and(mload(mc), mask) | |
) | |
) | |
for { | |
mc := add(mc, 0x20) | |
sc := add(sc, 1) | |
} lt(mc, end) { | |
sc := add(sc, 1) | |
mc := add(mc, 0x20) | |
} { | |
sstore(sc, mload(mc)) | |
} | |
mask := exp(0x100, sub(mc, end)) | |
sstore(sc, mul(div(mload(mc), mask), mask)) | |
} | |
default { | |
// get the keccak hash to get the contents of the array | |
mstore(0x0, _preBytes_slot) | |
// Start copying to the last used word of the stored array. | |
let sc := add(keccak256(0x0, 0x20), div(slength, 32)) | |
// save new length | |
sstore(_preBytes_slot, add(mul(newlength, 2), 1)) | |
// Copy over the first `submod` bytes of the new data as in | |
// case 1 above. | |
let slengthmod := mod(slength, 32) | |
let mlengthmod := mod(mlength, 32) | |
let submod := sub(32, slengthmod) | |
let mc := add(_postBytes, submod) | |
let end := add(_postBytes, mlength) | |
let mask := sub(exp(0x100, submod), 1) | |
sstore(sc, add(sload(sc), and(mload(mc), mask))) | |
for { | |
sc := add(sc, 1) | |
mc := add(mc, 0x20) | |
} lt(mc, end) { | |
sc := add(sc, 1) | |
mc := add(mc, 0x20) | |
} { | |
sstore(sc, mload(mc)) | |
} | |
mask := exp(0x100, sub(mc, end)) | |
sstore(sc, mul(div(mload(mc), mask), mask)) | |
} | |
} | |
} | |
function slice(bytes _bytes, uint _start, uint _length) internal pure returns (bytes) { | |
require(_bytes.length >= (_start + _length)); | |
bytes memory tempBytes; | |
assembly { | |
switch iszero(_length) | |
case 0 { | |
// Get a location of some free memory and store it in tempBytes as | |
// Solidity does for memory variables. | |
tempBytes := mload(0x40) | |
// The first word of the slice result is potentially a partial | |
// word read from the original array. To read it, we calculate | |
// the length of that partial word and start copying that many | |
// bytes into the array. The first word we copy will start with | |
// data we don't care about, but the last `lengthmod` bytes will | |
// land at the beginning of the contents of the new array. When | |
// we're done copying, we overwrite the full first word with | |
// the actual length of the slice. | |
let lengthmod := and(_length, 31) | |
// The multiplication in the next line is necessary | |
// because when slicing multiples of 32 bytes (lengthmod == 0) | |
// the following copy loop was copying the origin's length | |
// and then ending prematurely not copying everything it should. | |
let mc := add(add(tempBytes, lengthmod), mul(0x20, iszero(lengthmod))) | |
let end := add(mc, _length) | |
for { | |
// The multiplication in the next line has the same exact purpose | |
// as the one above. | |
let cc := add(add(add(_bytes, lengthmod), mul(0x20, iszero(lengthmod))), _start) | |
} lt(mc, end) { | |
mc := add(mc, 0x20) | |
cc := add(cc, 0x20) | |
} { | |
mstore(mc, mload(cc)) | |
} | |
mstore(tempBytes, _length) | |
//update free-memory pointer | |
//allocating the array padded to 32 bytes like the compiler does now | |
mstore(0x40, and(add(mc, 31), not(31))) | |
} | |
//if we want a zero-length slice let's just return a zero-length array | |
default { | |
tempBytes := mload(0x40) | |
mstore(0x40, add(tempBytes, 0x20)) | |
} | |
} | |
return tempBytes; | |
} | |
function toAddress(bytes _bytes, uint _start) internal pure returns (address) { | |
require(_bytes.length >= (_start + 20)); | |
address tempAddress; | |
assembly { | |
tempAddress := div(mload(add(add(_bytes, 0x20), _start)), 0x1000000000000000000000000) | |
} | |
return tempAddress; | |
} | |
function toUint(bytes _bytes, uint _start) internal pure returns (uint256) { | |
require(_bytes.length >= (_start + 32)); | |
uint256 tempUint; | |
assembly { | |
tempUint := mload(add(add(_bytes, 0x20), _start)) | |
} | |
return tempUint; | |
} | |
function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool) { | |
bool success = true; | |
assembly { | |
let length := mload(_preBytes) | |
// if lengths don't match the arrays are not equal | |
switch eq(length, mload(_postBytes)) | |
case 1 { | |
// cb is a circuit breaker in the for loop since there's | |
// no said feature for inline assembly loops | |
// cb = 1 - don't breaker | |
// cb = 0 - break | |
let cb := 1 | |
let mc := add(_preBytes, 0x20) | |
let end := add(mc, length) | |
for { | |
let cc := add(_postBytes, 0x20) | |
// the next line is the loop condition: | |
// while(uint(mc < end) + cb == 2) | |
} eq(add(lt(mc, end), cb), 2) { | |
mc := add(mc, 0x20) | |
cc := add(cc, 0x20) | |
} { | |
// if any of these checks fails then arrays are not equal | |
if iszero(eq(mload(mc), mload(cc))) { | |
// unsuccess: | |
success := 0 | |
cb := 0 | |
} | |
} | |
} | |
default { | |
// unsuccess: | |
success := 0 | |
} | |
} | |
return success; | |
} | |
function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool) { | |
bool success = true; | |
assembly { | |
// we know _preBytes_offset is 0 | |
let fslot := sload(_preBytes_slot) | |
// Decode the length of the stored array like in concatStorage(). | |
let slength := div(and(fslot, sub(mul(0x100, iszero(and(fslot, 1))), 1)), 2) | |
let mlength := mload(_postBytes) | |
// if lengths don't match the arrays are not equal | |
switch eq(slength, mlength) | |
case 1 { | |
// slength can contain both the length and contents of the array | |
// if length < 32 bytes so let's prepare for that | |
// v. http://solidity.readthedocs.io/en/latest/miscellaneous.html#layout-of-state-variables-in-storage | |
if iszero(iszero(slength)) { | |
switch lt(slength, 32) | |
case 1 { | |
// blank the last byte which is the length | |
fslot := mul(div(fslot, 0x100), 0x100) | |
if iszero(eq(fslot, mload(add(_postBytes, 0x20)))) { | |
// unsuccess: | |
success := 0 | |
} | |
} | |
default { | |
// cb is a circuit breaker in the for loop since there's | |
// no said feature for inline assembly loops | |
// cb = 1 - don't breaker | |
// cb = 0 - break | |
let cb := 1 | |
// get the keccak hash to get the contents of the array | |
mstore(0x0, _preBytes_slot) | |
let sc := keccak256(0x0, 0x20) | |
let mc := add(_postBytes, 0x20) | |
let end := add(mc, mlength) | |
// the next line is the loop condition: | |
// while(uint(mc < end) + cb == 2) | |
for {} eq(add(lt(mc, end), cb), 2) { | |
sc := add(sc, 1) | |
mc := add(mc, 0x20) | |
} { | |
if iszero(eq(sload(sc), mload(mc))) { | |
// unsuccess: | |
success := 0 | |
cb := 0 | |
} | |
} | |
} | |
} | |
} | |
default { | |
// unsuccess: | |
success := 0 | |
} | |
} | |
return success; | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import "./ERC721.sol"; | |
import "./BytesLib.sol"; | |
pragma solidity ^0.4.24; | |
contract CricketNFT is ERC721 { | |
using BytesLib for bytes; | |
using SafeMath for uint256; | |
// Fees - denoted in % | |
uint8 constant internal processingFee_ = 5; // inc. fees to cover DAILY gas usage to assign divs to token holders | |
/*** EVENTS ***/ | |
/// @dev The Created event is fired whenever a new collectible comes into existence. | |
event Created(address owner, uint256 tokenId); | |
/*** DATATYPES ***/ | |
struct Player { | |
// Player Name | |
bytes32 name; | |
// G-Gold, S-Silver, B-Bronze | |
// Determining base price for playerCombinations Card | |
bytes1 tier; | |
// To identify if a player exists | |
// Why UID? Read More, you shall find out | |
// Eases out playerCombinations checks | |
bytes4 uid; | |
// Index should be greater than zero | |
uint16 indx; | |
} | |
struct PlayerCard { | |
// PlayerCompositions if say 20, 30, 40 then the val shall be 203040 | |
// Ordering shall be determined by sorting player Ids | |
// For e.g., if PlayerCard is composed of Virat Kohli, Jasprit Bumrah, MS Dhoni with playerIds 18, 93, 7 | |
// with compositions 50, 20, 30 | |
// The players shall first be sorted per playerIds 7(MS Dhoni), 18(Virat Kohli), 93(Jasprit Bumrah) | |
// The playerCompositions number shall now be 305020 | |
// uid shall also be based on the sorted order | |
uint playerCompositions; | |
// Players ID Composite ID | |
bytes12 uid; | |
// PlayerCard Index | |
uint indx; | |
} | |
mapping(bytes4 => Player) allPlayersByUid; | |
mapping(bytes12 => mapping(uint => bool)) playerCompositions; | |
uint256 allPlayersCount; | |
PlayerCard[] allPlayerCards; | |
uint[] playerIds; | |
mapping(uint => bytes4) playerUids; | |
mapping(uint => uint) playerComps; | |
/// For creating player | |
function _createPlayer(bytes32 _name, bytes1 _tier) internal returns(uint16) { | |
require(!playerExists(_name, _tier)); | |
bytes4 _uid = bytes4(keccak256(abi.encodePacked(_name, _tier))); | |
allPlayersCount += 1; | |
Player memory _playerObj = Player({ | |
name: _name, | |
tier: _tier, | |
uid: _uid, | |
indx: uint16(allPlayersCount) | |
}); | |
allPlayersByUid[_uid] = _playerObj; | |
} | |
/// Check if a player already exists | |
function playerExists(bytes32 _name, bytes1 _tier) public view returns(bool) { | |
bytes4 _uid = bytes4(keccak256(abi.encodePacked(_name, _tier))); | |
return (allPlayersByUid[_uid].indx > 0); | |
} | |
// Check if all the player compositions total upto 100 | |
function checkCompositions(uint256[3] _compositions) public pure returns(bool) { | |
uint sum = 0; | |
for (uint i = 0; i < 3; i++) { | |
// Require SafeMath as this is a user input based fn | |
sum += _compositions[i]; | |
} | |
return (sum == 100); | |
} | |
// Check if the players requested exists | |
// Returns a compositeId, compositeNum on success | |
function checkPlayers(bytes32[3] _players, bytes1[3] _tiers, uint256[3] _compositions) public returns(bytes12, uint256) { | |
bytes12 compositeId; | |
uint256 compositeNumber; | |
// Extract IDs and stores playerUids, playerComps per sort order | |
for (uint i = 0; i < 3; i++) { | |
bytes4 _uid = bytes4(keccak256(abi.encodePacked(_players[i], _tiers[i]))); | |
assert(allPlayersByUid[_uid].indx > 0); | |
playerUids[allPlayersByUid[_uid].indx] = _uid; | |
playerComps[allPlayersByUid[_uid].indx] = _compositions[i]; | |
playerIds.push(allPlayersByUid[_uid].indx); | |
} | |
// Easy to sort a tuple than an array | |
(uint a, uint b, uint c) = (playerIds[1], playerIds[2], playerIds[3]); | |
if (a > c) { | |
(a, b, c) = (c, b, a); | |
} | |
if (a > b) { | |
(a, b, c) = (b, a, c); | |
} | |
if (b > c) { | |
(a, b, c) = (a, c, b); | |
} | |
// Composite ID based on Sort Order | |
// TODO: | |
// compositeId = playerUids[a].concat(playerUids[b]).concat(playerUids[c]); | |
// Composite Number based on Sort Order | |
compositeNumber = playerComps[a] * 100 + playerComps[b] * 10 + playerComps[c]; | |
return (compositeId, compositeNumber); | |
} | |
function compositionValidator(bytes12 _comp, uint256 _compNum) internal view returns(bool) { | |
return (playerCompositions[_comp][_compNum]); | |
} | |
/// For creating PlayerCard | |
function _createPlayerCard( | |
bytes32[3] _players, | |
bytes1[3] _tiers, | |
uint256[3] _compositions, | |
address _owner) | |
internal | |
returns(uint256) { | |
// Check if _compositions match up to 100 | |
assert(checkCompositions(_compositions)); | |
// Check if player exists | |
bytes12 compositeId; | |
uint compositeNum; | |
(compositeId, compositeNum) = checkPlayers(_players, _tiers, _compositions); | |
assert(compositionValidator(compositeId, compositeNum)); | |
// Check if playerCompositions already exists | |
PlayerCard memory _playerCardObj = PlayerCard({ | |
playerCompositions: compositeNum, | |
uid: compositeId, | |
indx: allPlayerCards.length | |
}); | |
uint256 newPlayerCardId = allPlayerCards.push(_playerCardObj) - 1; | |
_mint(_owner, newPlayerCardId); | |
// Created event | |
emit Created(_owner, newPlayerCardId); | |
return newPlayerCardId; | |
} | |
/// @dev Gets attributes of PlayerCard | |
function _getAttributesOfToken(uint _tokenId) internal view returns(PlayerCard) { | |
PlayerCard memory _playerCardObj = allPlayerCards[_tokenId]; | |
return _playerCardObj; | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC165.sol"; | |
/** | |
* @title ERC165 | |
* @author Matt Condon (@shrugs) | |
* @dev Implements ERC165 using a lookup table. | |
*/ | |
contract ERC165 is IERC165 { | |
bytes4 private constant _InterfaceId_ERC165 = 0x01ffc9a7; | |
/** | |
* 0x01ffc9a7 === | |
* bytes4(keccak256('supportsInterface(bytes4)')) | |
*/ | |
/** | |
* @dev a mapping of interface id to whether or not it's supported | |
*/ | |
mapping(bytes4 => bool) internal _supportedInterfaces; | |
/** | |
* @dev A contract implementing SupportsInterfaceWithLookup | |
* implement ERC165 itself | |
*/ | |
constructor() | |
public | |
{ | |
_registerInterface(_InterfaceId_ERC165); | |
} | |
/** | |
* @dev implement supportsInterface(bytes4) using a lookup table | |
*/ | |
function supportsInterface(bytes4 interfaceId) | |
external | |
view | |
returns (bool) | |
{ | |
return _supportedInterfaces[interfaceId]; | |
} | |
/** | |
* @dev private method for registering an interface | |
*/ | |
function _registerInterface(bytes4 interfaceId) | |
internal | |
{ | |
require(interfaceId != 0xffffffff); | |
_supportedInterfaces[interfaceId] = true; | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC721.sol"; | |
import "./IERC721Receiver.sol"; | |
import "./SafeMath.sol"; | |
import "./Address.sol"; | |
import "./ERC165.sol"; | |
/** | |
* @title ERC721 Non-Fungible Token Standard basic implementation | |
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md | |
*/ | |
contract ERC721 is ERC165, IERC721 { | |
using SafeMath for uint256; | |
using Address for address; | |
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` | |
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector` | |
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02; | |
// Mapping from token ID to owner | |
mapping (uint256 => address) private _tokenOwner; | |
// Mapping from token ID to approved address | |
mapping (uint256 => address) private _tokenApprovals; | |
// Mapping from owner to number of owned token | |
mapping (address => uint256) private _ownedTokensCount; | |
// Mapping from owner to operator approvals | |
mapping (address => mapping (address => bool)) private _operatorApprovals; | |
bytes4 private constant _InterfaceId_ERC721 = 0x80ac58cd; | |
/* | |
* 0x80ac58cd === | |
* bytes4(keccak256('balanceOf(address)')) ^ | |
* bytes4(keccak256('ownerOf(uint256)')) ^ | |
* bytes4(keccak256('approve(address,uint256)')) ^ | |
* bytes4(keccak256('getApproved(uint256)')) ^ | |
* bytes4(keccak256('setApprovalForAll(address,bool)')) ^ | |
* bytes4(keccak256('isApprovedForAll(address,address)')) ^ | |
* bytes4(keccak256('transferFrom(address,address,uint256)')) ^ | |
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^ | |
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) | |
*/ | |
constructor() | |
public | |
{ | |
// register the supported interfaces to conform to ERC721 via ERC165 | |
_registerInterface(_InterfaceId_ERC721); | |
} | |
/** | |
* @dev Gets the balance of the specified address | |
* @param owner address to query the balance of | |
* @return uint256 representing the amount owned by the passed address | |
*/ | |
function balanceOf(address owner) public view returns (uint256) { | |
require(owner != address(0)); | |
return _ownedTokensCount[owner]; | |
} | |
/** | |
* @dev Gets the owner of the specified token ID | |
* @param tokenId uint256 ID of the token to query the owner of | |
* @return owner address currently marked as the owner of the given token ID | |
*/ | |
function ownerOf(uint256 tokenId) public view returns (address) { | |
address owner = _tokenOwner[tokenId]; | |
require(owner != address(0)); | |
return owner; | |
} | |
/** | |
* @dev Approves another address to transfer the given token ID | |
* The zero address indicates there is no approved address. | |
* There can only be one approved address per token at a given time. | |
* Can only be called by the token owner or an approved operator. | |
* @param to address to be approved for the given token ID | |
* @param tokenId uint256 ID of the token to be approved | |
*/ | |
function approve(address to, uint256 tokenId) public { | |
address owner = ownerOf(tokenId); | |
require(to != owner); | |
require(msg.sender == owner || isApprovedForAll(owner, msg.sender)); | |
_tokenApprovals[tokenId] = to; | |
emit Approval(owner, to, tokenId); | |
} | |
/** | |
* @dev Gets the approved address for a token ID, or zero if no address set | |
* Reverts if the token ID does not exist. | |
* @param tokenId uint256 ID of the token to query the approval of | |
* @return address currently approved for the given token ID | |
*/ | |
function getApproved(uint256 tokenId) public view returns (address) { | |
require(_exists(tokenId)); | |
return _tokenApprovals[tokenId]; | |
} | |
/** | |
* @dev Sets or unsets the approval of a given operator | |
* An operator is allowed to transfer all tokens of the sender on their behalf | |
* @param to operator address to set the approval | |
* @param approved representing the status of the approval to be set | |
*/ | |
function setApprovalForAll(address to, bool approved) public { | |
require(to != msg.sender); | |
_operatorApprovals[msg.sender][to] = approved; | |
emit ApprovalForAll(msg.sender, to, approved); | |
} | |
/** | |
* @dev Tells whether an operator is approved by a given owner | |
* @param owner owner address which you want to query the approval of | |
* @param operator operator address which you want to query the approval of | |
* @return bool whether the given operator is approved by the given owner | |
*/ | |
function isApprovedForAll( | |
address owner, | |
address operator | |
) | |
public | |
view | |
returns (bool) | |
{ | |
return _operatorApprovals[owner][operator]; | |
} | |
/** | |
* @dev Transfers the ownership of a given token ID to another address | |
* Usage of this method is discouraged, use `safeTransferFrom` whenever possible | |
* Requires the msg sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function transferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) | |
public | |
{ | |
require(_isApprovedOrOwner(msg.sender, tokenId)); | |
require(to != address(0)); | |
_clearApproval(from, tokenId); | |
_removeTokenFrom(from, tokenId); | |
_addTokenTo(to, tokenId); | |
emit Transfer(from, to, tokenId); | |
} | |
/** | |
* @dev Safely transfers the ownership of a given token ID to another address | |
* If the target address is a contract, it must implement `onERC721Received`, | |
* which is called upon a safe transfer, and return the magic value | |
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, | |
* the transfer is reverted. | |
* | |
* Requires the msg sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId | |
) | |
public | |
{ | |
// solium-disable-next-line arg-overflow | |
safeTransferFrom(from, to, tokenId, ""); | |
} | |
/** | |
* @dev Safely transfers the ownership of a given token ID to another address | |
* If the target address is a contract, it must implement `onERC721Received`, | |
* which is called upon a safe transfer, and return the magic value | |
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise, | |
* the transfer is reverted. | |
* Requires the msg sender to be the owner, approved, or operator | |
* @param from current owner of the token | |
* @param to address to receive the ownership of the given token ID | |
* @param tokenId uint256 ID of the token to be transferred | |
* @param _data bytes data to send along with a safe transfer check | |
*/ | |
function safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId, | |
bytes _data | |
) | |
public | |
{ | |
transferFrom(from, to, tokenId); | |
// solium-disable-next-line arg-overflow | |
require(_checkAndCallSafeTransfer(from, to, tokenId, _data)); | |
} | |
/** | |
* @dev Returns whether the specified token exists | |
* @param tokenId uint256 ID of the token to query the existence of | |
* @return whether the token exists | |
*/ | |
function _exists(uint256 tokenId) internal view returns (bool) { | |
address owner = _tokenOwner[tokenId]; | |
return owner != address(0); | |
} | |
/** | |
* @dev Returns whether the given spender can transfer a given token ID | |
* @param spender address of the spender to query | |
* @param tokenId uint256 ID of the token to be transferred | |
* @return bool whether the msg.sender is approved for the given token ID, | |
* is an operator of the owner, or is the owner of the token | |
*/ | |
function _isApprovedOrOwner( | |
address spender, | |
uint256 tokenId | |
) | |
internal | |
view | |
returns (bool) | |
{ | |
address owner = ownerOf(tokenId); | |
// Disable solium check because of | |
// https://github.com/duaraghav8/Solium/issues/175 | |
// solium-disable-next-line operator-whitespace | |
return ( | |
spender == owner || | |
getApproved(tokenId) == spender || | |
isApprovedForAll(owner, spender) | |
); | |
} | |
/** | |
* @dev Internal function to mint a new token | |
* Reverts if the given token ID already exists | |
* @param to The address that will own the minted token | |
* @param tokenId uint256 ID of the token to be minted by the msg.sender | |
*/ | |
function _mint(address to, uint256 tokenId) internal { | |
require(to != address(0)); | |
_addTokenTo(to, tokenId); | |
emit Transfer(address(0), to, tokenId); | |
} | |
/** | |
* @dev Internal function to burn a specific token | |
* Reverts if the token does not exist | |
* @param tokenId uint256 ID of the token being burned by the msg.sender | |
*/ | |
function _burn(address owner, uint256 tokenId) internal { | |
_clearApproval(owner, tokenId); | |
_removeTokenFrom(owner, tokenId); | |
emit Transfer(owner, address(0), tokenId); | |
} | |
/** | |
* @dev Internal function to clear current approval of a given token ID | |
* Reverts if the given address is not indeed the owner of the token | |
* @param owner owner of the token | |
* @param tokenId uint256 ID of the token to be transferred | |
*/ | |
function _clearApproval(address owner, uint256 tokenId) internal { | |
require(ownerOf(tokenId) == owner); | |
if (_tokenApprovals[tokenId] != address(0)) { | |
_tokenApprovals[tokenId] = address(0); | |
} | |
} | |
/** | |
* @dev Internal function to add a token ID to the list of a given address | |
* @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 _addTokenTo(address to, uint256 tokenId) internal { | |
require(_tokenOwner[tokenId] == address(0)); | |
_tokenOwner[tokenId] = to; | |
_ownedTokensCount[to] = _ownedTokensCount[to].add(1); | |
} | |
/** | |
* @dev Internal function to remove a token ID from the list of a given address | |
* @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 _removeTokenFrom(address from, uint256 tokenId) internal { | |
require(ownerOf(tokenId) == from); | |
_ownedTokensCount[from] = _ownedTokensCount[from].sub(1); | |
_tokenOwner[tokenId] = address(0); | |
} | |
/** | |
* @dev Internal function to invoke `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 whether the call correctly returned the expected magic value | |
*/ | |
function _checkAndCallSafeTransfer( | |
address from, | |
address to, | |
uint256 tokenId, | |
bytes _data | |
) | |
internal | |
returns (bool) | |
{ | |
if (!to.isContract()) { | |
return true; | |
} | |
bytes4 retval = IERC721Receiver(to).onERC721Received( | |
msg.sender, from, tokenId, _data); | |
return (retval == _ERC721_RECEIVED); | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./ERC721.sol"; | |
import "./ERC721Enumerable.sol"; | |
import "./ERC721Metadata.sol"; | |
/** | |
* @title Full ERC721 Token | |
* This implementation includes all the required and some optional functionality of the ERC721 standard | |
* Moreover, it includes approve all functionality using operator terminology | |
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md | |
*/ | |
contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata { | |
constructor(string name, string symbol) ERC721Metadata(name, symbol) | |
public | |
{ | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC721Receiver.sol"; | |
contract ERC721Holder is IERC721Receiver { | |
function onERC721Received( | |
address, | |
address, | |
uint256, | |
bytes | |
) | |
public | |
returns(bytes4) | |
{ | |
return this.onERC721Received.selector; | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./ERC721.sol"; | |
import "./IERC721Metadata.sol"; | |
import "../../introspection/ERC165.sol"; | |
contract ERC721Metadata is ERC165, ERC721, IERC721Metadata { | |
// Token name | |
string internal _name; | |
// Token symbol | |
string internal _symbol; | |
// Optional mapping for token URIs | |
mapping(uint256 => string) private _tokenURIs; | |
bytes4 private constant InterfaceId_ERC721Metadata = 0x5b5e139f; | |
/** | |
* 0x5b5e139f === | |
* bytes4(keccak256('name()')) ^ | |
* bytes4(keccak256('symbol()')) ^ | |
* bytes4(keccak256('tokenURI(uint256)')) | |
*/ | |
/** | |
* @dev Constructor function | |
*/ | |
constructor(string name, string symbol) public { | |
_name = name; | |
_symbol = symbol; | |
// register the supported interfaces to conform to ERC721 via ERC165 | |
_registerInterface(InterfaceId_ERC721Metadata); | |
} | |
/** | |
* @dev Gets the token name | |
* @return string representing the token name | |
*/ | |
function name() external view returns (string) { | |
return _name; | |
} | |
/** | |
* @dev Gets the token symbol | |
* @return string representing the token symbol | |
*/ | |
function symbol() external view returns (string) { | |
return _symbol; | |
} | |
/** | |
* @dev Returns an URI for a given token ID | |
* Throws if the token ID does not exist. May return an empty string. | |
* @param tokenId uint256 ID of the token to query | |
*/ | |
function tokenURI(uint256 tokenId) public view returns (string) { | |
require(_exists(tokenId)); | |
return _tokenURIs[tokenId]; | |
} | |
/** | |
* @dev Internal function to set the token URI for a given token | |
* Reverts if the token ID does not exist | |
* @param tokenId uint256 ID of the token to set its URI | |
* @param uri string URI to assign | |
*/ | |
function _setTokenURI(uint256 tokenId, string uri) internal { | |
require(_exists(tokenId)); | |
_tokenURIs[tokenId] = uri; | |
} | |
/** | |
* @dev Internal function to burn a specific token | |
* Reverts if the token does not exist | |
* @param owner owner of the token to burn | |
* @param tokenId uint256 ID of the token being burned by the msg.sender | |
*/ | |
function _burn(address owner, uint256 tokenId) internal { | |
super._burn(owner, tokenId); | |
// Clear metadata (if any) | |
if (bytes(_tokenURIs[tokenId]).length != 0) { | |
delete _tokenURIs[tokenId]; | |
} | |
} | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
/** | |
* @title IERC165 | |
* @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md | |
*/ | |
interface IERC165 { | |
/** | |
* @notice Query if a contract implements an interface | |
* @param interfaceId The interface identifier, as specified in ERC-165 | |
* @dev Interface identification is specified in ERC-165. This function | |
* uses less than 30,000 gas. | |
*/ | |
function supportsInterface(bytes4 interfaceId) | |
external | |
view | |
returns (bool); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC165.sol"; | |
/** | |
* @title ERC721 Non-Fungible Token Standard basic interface | |
* @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md | |
*/ | |
contract IERC721 is IERC165 { | |
event Transfer( | |
address indexed from, | |
address indexed to, | |
uint256 indexed tokenId | |
); | |
event Approval( | |
address indexed owner, | |
address indexed approved, | |
uint256 indexed tokenId | |
); | |
event ApprovalForAll( | |
address indexed owner, | |
address indexed operator, | |
bool approved | |
); | |
function balanceOf(address owner) public view returns (uint256 balance); | |
function ownerOf(uint256 tokenId) public view returns (address owner); | |
function approve(address to, uint256 tokenId) public; | |
function getApproved(uint256 tokenId) | |
public view returns (address operator); | |
function setApprovalForAll(address operator, bool _approved) public; | |
function isApprovedForAll(address owner, address operator) | |
public view returns (bool); | |
function transferFrom(address from, address to, uint256 tokenId) public; | |
function safeTransferFrom(address from, address to, uint256 tokenId) | |
public; | |
function safeTransferFrom( | |
address from, | |
address to, | |
uint256 tokenId, | |
bytes data | |
) | |
public; | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC721.sol"; | |
/** | |
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension | |
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md | |
*/ | |
contract IERC721Enumerable is IERC721 { | |
function totalSupply() public view returns (uint256); | |
function tokenOfOwnerByIndex( | |
address owner, | |
uint256 index | |
) | |
public | |
view | |
returns (uint256 tokenId); | |
function tokenByIndex(uint256 index) public view returns (uint256); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC721.sol"; | |
import "./IERC721Enumerable.sol"; | |
import "./IERC721Metadata.sol"; | |
/** | |
* @title ERC-721 Non-Fungible Token Standard, full implementation interface | |
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md | |
*/ | |
contract IERC721Full is IERC721, IERC721Enumerable, IERC721Metadata { | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
import "./IERC721.sol"; | |
/** | |
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension | |
* @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md | |
*/ | |
contract IERC721Metadata is IERC721 { | |
function name() external view returns (string); | |
function symbol() external view returns (string); | |
function tokenURI(uint256 tokenId) public view returns (string); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
/** | |
* @title ERC721 token receiver interface | |
* @dev Interface for any contract that wants to support safeTransfers | |
* from ERC721 asset contracts. | |
*/ | |
contract IERC721Receiver { | |
/** | |
* @notice Handle the receipt of an NFT | |
* @dev The ERC721 smart contract calls this function on the recipient | |
* after a `safeTransfer`. This function MUST return the function selector, | |
* otherwise the caller will revert the transaction. The selector to be | |
* returned can be obtained as `this.onERC721Received.selector`. This | |
* function MAY throw to revert and reject the transfer. | |
* Note: the ERC721 contract address is always the message sender. | |
* @param operator The address which called `safeTransferFrom` function | |
* @param from The address which previously owned the token | |
* @param tokenId The NFT identifier which is being transferred | |
* @param data Additional data with no specified format | |
* @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))` | |
*/ | |
function onERC721Received( | |
address operator, | |
address from, | |
uint256 tokenId, | |
bytes data | |
) | |
public | |
returns(bytes4); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
pragma solidity ^0.4.24; | |
/** | |
* @title SafeMath | |
* @dev Math operations with safety checks that revert on error | |
*/ | |
library SafeMath { | |
/** | |
* @dev Multiplies two numbers, reverts on overflow. | |
*/ | |
function mul(uint256 a, uint256 b) internal pure returns (uint256) { | |
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the | |
// benefit is lost if 'b' is also tested. | |
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 | |
if (a == 0) { | |
return 0; | |
} | |
uint256 c = a * b; | |
require(c / a == b); | |
return c; | |
} | |
/** | |
* @dev Integer division of two numbers truncating the quotient, reverts on division by zero. | |
*/ | |
function div(uint256 a, uint256 b) internal pure returns (uint256) { | |
require(b > 0); // Solidity only automatically asserts when dividing by 0 | |
uint256 c = a / b; | |
// assert(a == b * c + a % b); // There is no case in which this doesn't hold | |
return c; | |
} | |
/** | |
* @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend). | |
*/ | |
function sub(uint256 a, uint256 b) internal pure returns (uint256) { | |
require(b <= a); | |
uint256 c = a - b; | |
return c; | |
} | |
/** | |
* @dev Adds two numbers, reverts on overflow. | |
*/ | |
function add(uint256 a, uint256 b) internal pure returns (uint256) { | |
uint256 c = a + b; | |
require(c >= a); | |
return c; | |
} | |
/** | |
* @dev Divides two numbers and returns the remainder (unsigned integer modulo), | |
* reverts when dividing by zero. | |
*/ | |
function mod(uint256 a, uint256 b) internal pure returns (uint256) { | |
require(b != 0); | |
return a % b; | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment