Contract Name:
OnChainSands
Contract Source Code:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.2;
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";
contract OnChainSands is ERC721, ERC721Enumerable, Ownable {
using Counters for Counters.Counter;
using SafeMath for uint256;
Counters.Counter private _tokenIdCounter;
uint private constant maxTokensPerTransaction = 30;
uint256 private tokenPrice = 30000000000000000; //0.03 ETH
uint256 private constant nftsNumber = 5000;
uint256 private constant nftsPublicNumber = 4950;
constructor() ERC721("OnChain Sands", "SND") {
_tokenIdCounter.increment();
}
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT license
// 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);
}
function safeMint(address to) public onlyOwner {
_safeMint(to, _tokenIdCounter.current());
_tokenIdCounter.increment();
}
// The following functions are overrides required by Solidity.
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 random(string memory input) internal pure returns (uint256) {
return uint256(keccak256(abi.encodePacked(input)));
}
function toHashCode(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "000000";
}
uint256 i;
bytes memory buffer = "000000";
for(i=6;i>0;i--) {
if (value % 16 < 10)
buffer[i-1] = bytes1(uint8(48 + uint256(value % 16)));
else
buffer[i-1] = bytes1(uint8(55 + uint256(value % 16)));
value /= 16;
}
return string(buffer);
}
function getFarObject(uint256 num) internal pure returns (string memory) {
string[4] memory far;
far[0] ='M431.741,537.724 371.85,467.096 321.582,517.364 254.859,442.361 160.11,537.109';
far[1] ='M191,556l219-2l-99-117L191,556z';
far[2] ='M244,557 238,488 248,488 238,413 298,398 296,389 424,407 401,484 391,487 383,555';
far[3] ='M209,511c0-0,36-8,36-8 s10-1,11-1s17-15,17-16s0-6,0-6l19-0v-6h9l1-6h4v-1 h67v2h5v4c0,0,11-1,11,0s0,8,0,8h20v6l18,18h7v10v70H209 L209,511z';
return far[num-1];
}
function getSun(uint256 num) internal pure returns (string memory) {
uint256 suns;
uint256 suns_m;
suns_m = 650299126634312082;
suns = 709260192684279125512259162535278106613289157619291124044823099706295099;
if (num >= 8) {
suns = num == 8 ? suns_m : suns_m / 1000000000;
} else {
if (num > 0)
suns = suns / (1000 ** (num*3));
}
string memory output = string(abi.encodePacked('cx="',toString((suns/1000000)%1000),'" cy="',toString((suns/1000)%1000), '" r="',toString(suns%1000),'"'));
return output;
}
//this feature is just for fun, it's pointless.
function getCamel(uint256 num) internal pure returns (string memory) {
uint256[50] memory xtypes;
uint256 pos;
uint256 i;
uint256 temp;
uint256 sym;
uint256 lines;
xtypes[0] = 2750871777490806264085493004602956112481215626846361120;
// Elon Musk is a poser
xtypes[1] = 24031940146303221873185246330856176777890234172085460524828847635091787832103;
xtypes[2] = 4369554406778136407906521031351492442121714090311337998835645029932110349922;
xtypes[3] = 35339669699060465125668189898147169548632576962648599291375229098669428362322;
xtypes[4] = 672238645676028630017590070904525;
xtypes[11] = 37599700675902714367317740679304042296080055052422520140113640294389393350439;
xtypes[12] = 38087302781903350862724587794493881498317283716547227642212787098338845152311;
xtypes[13] = 1114275929128553399568145623741250323077119217211655860047041411166003561237;
xtypes[14] = 44483940829496349223937135327653774303045114145795750475934727822431742908025;
xtypes[15] = 1301031010810467202189960410466201454370628906584976487492660977313;
xtypes[21] = 24511554605809013553427690817438832449166603887000346203695542442847542862631;
xtypes[22] = 24712231507965098789272277915974614596914779217528115716846960336470200999989;
xtypes[23] = 31779261119830188930260713981005416210882557915559935577937916313743035255330;
xtypes[24] = 30845749996097297930742408311135328346981512733480170301818670564314058110498;
xtypes[25] = 4393324743237794958108912339045511528520735357988065415454558326487042311245;
xtypes[26] = 4383618393247594429327385840719100733921976757672061077695343950821928420434;
xtypes[27] = 28260977779972716408629221197954496518888178178346784762024000144425;
// I wrote that because I'm jealous of his billions
xtypes[31] = 33981201337895841066299736423112852304759862823304893271895015697500599799591;
xtypes[32] = 38092437674498035584450155165625035089506200894468052066380022772320589009972;
xtypes[33] = 1002964437672768398493084675030519774534336229557529541653364574576256516854;
xtypes[34] = 41202914189462662695915620887590875333337880836299726911136825280773640739640;
xtypes[35] = 40993983140047288513282733679841254915488686784624912185639295148702690920129;
xtypes[36] = 43462155136449166491448379421314888609432193428547199763947083681431896678423;
xtypes[37] = 3091541931616987385254478349605488253295528003625843124585170727615066703541;
xtypes[38] = 42893843881028951002600077923910138109116652418088673519145098082818520534773;
xtypes[39] = 35790225028626312902234269550783631619805539570794490376389285434126321176320;
xtypes[40] = 23946826271475684407;
// and the fact that he's sexy
xtypes[41] = 32696238382569806469557342148762393436204618157687364688486249358066242446087;
xtypes[42] = 30829847781535805781250327403060765435737126585110613555906562372477089399884;
xtypes[43] = 2322370439730553613354915887410243625117939153279733562435129926126979548749;
xtypes[44] = 3077242879332650009073929722759956366751482431073885344923252432370954176881;
xtypes[45] = 35126784166904065671947169645446477285741344117817602589955598641710815590065;
xtypes[46] = 2978473281905248387737881203435264718697731825484007630263831601596209749570;
xtypes[47] = 542357;
bytes memory buffer = new bytes(500);
temp = xtypes[1];
pos=0;
for(lines=1;lines<=10;lines++) {
if (xtypes[10*(num-1) + lines] == 0)
break;
temp = xtypes[10*(num-1) + lines];
for(i=0;i<=50;i++) {
if (temp==0)
break;
sym = temp%32;
temp /= 32;
buffer[pos++] = bytes1(uint8((xtypes[0]/(128**sym))%128));
}
}
bytes memory buffer2 = new bytes(pos);
for(i=0;i<pos;i++)
buffer2[i] = buffer[i];
return string(buffer2);
}
// programmers are the coolest people.
function getDune1(uint256 num) internal pure returns (string memory) {
string[2] memory dune;
dune[0] = 'M-68,1082l1157,6l-19-577c0,0-39-6-117-6 s-102,8-185,16s-118,8-183,8s-181-21-331-21s-286,42-286,42 L-68,1082z';
dune[1] = 'M1089,1015l-1157,5l19-478c0,0,42-15,119-22 c77-6,173-8,255,0c82,9,159,12,225,12s188-14,338-14 s165,33,165,33L1089,1015z';
return dune[num-1];
}
// and humble.
function getDune2(uint256 num) internal pure returns (string memory) {
string[4] memory dune;
dune[0] = 'M-39,1013l1181,40c0,0-18-502-77-485 c-185,52-250-23-416-5c-77,8-148,29-324-22S-61,574-61,614 L-39,1013z';
dune[1] = 'M1140,1013l-1181,40c0,0-37-507,23-496c189,34,315-4,482,13 c77,8,205,51,391-21c170-66,270,61,273,69L1140,1013z';
dune[2] = 'M-39,1016l1181,40c0,0-18-502-77-485 c-185,52-211-40-377-22c-77,8-203,37-380,25 c-182-12-327,14-330,22L-39,1016z';
dune[3] = 'M1142,1016l-1181,40c0,0-66-554-9-530 c181,77,299,26,464,33c77,3,207,45,382,14 c180-32,327,14,330,22L1142,1016z';
return dune[num-1];
}
function tokenURI(uint256 tokenId) pure public override(ERC721) returns (string memory) {
uint256[17] memory xtypes;
string[5] memory colors;
string[4] memory dune3;
string[4] memory dune31;
string[4] memory dune32;
string[27] memory parts;
uint256[12] memory params;
string[6] memory obj1;
string[6] memory obj2;
uint256 pos;
uint256 rand = random(string(abi.encodePacked('Sand',toString(tokenId))));
params[0] = 1 + ((rand/10) % 5);// camel=
params[1] = 1 + ((rand/1000) % 33); // pallette=
params[2] = 1 + ((rand/10000) % 4); // dune main
params[3] = 1 + ((rand/10000) % 2); // dune top
params[4] = 1 + ((rand/100000) % 4); // dune bottom
params[5] = 1 + ((rand/1000000000) % 4); // pyr=
params[6] = 1 + ((rand/10000000000) % 5); // obj=
params[7] = 1 + ((rand/100000000) % 5); // sun
obj1[0] = 'M128,897c4,1,8,6,15,7 c8-5,15-11,20-17c0-2,1-5,1-6c0-0,0-0,0-0 c0-0,0-0,0-0c2-3,5-4,7-3c0-0,0-1,1-1 c-2-2-8-1-12,4c-3,5-6,6-6,6c-2,0-3,0-4,0 c-0-0-0-0-0-0c-0-2-3-4-6-4l-0-2l-3,1l0,2 c-2,1-3,4-2,7c0,0,0,0,0,0c-4,1-11,2-16,2 c-8-0-8,6-8,6l9-2C125,896,127,896,128,897z';
obj1[1] = 'M177,903 214,864 186,888 177,872 181,892 167,904 160,889 168,880 158,885 140,842 152,878 134,874 154,884 164,915 171,915 175,905 190,903';
obj1[2] = 'M173,924l-2-9l-8-4l-5-9 l-0,11l-7,3l-0,3l-16,13l2,3l6-0l10-0l2-2l3,1l7-1 l1-2l4-1l10,3L173,924z';
obj1[3] = 'M102,924c42,0,79-13,96-32 l-1-10l-19-6l-9,4l-6-6l-20-11l-11,3l-1,37l-8,5l-6-2 l-8,2l-5,17C100,924,101,924,102,924z';
obj1[4] = 'M196,909l-27-60l2-3l-2-2 l2-1l-7-3l0,6l-14,16l1,11l0-9l13-11l2,0l2,5 l-2,44l3-7l0,3l2-30l0,1c0,7,2,21,2,21 c0-0,0-9,0-14l13,34L196,909z';
obj2[0] = 'M176,873c0,0-92,25-89,38 c3,13,43,1,56-8C157,895,176,873,176,873z';
obj2[1] = 'M135,907 164,913 164,915 171,915 145,929 112,932 145,925 160,916 151,912 145,914 147,911';
obj2[2] = 'M164,927 159,927 155,929 155,931 141,931 140,930 150,922 139,929 138,929 133,933 137,932 134,935 155,931 155,932 158,934 163,932 166,930';
obj2[3] = 'M188,900l-14-21l-4,1 c0,0,7,19,7,20c-0,0-6,1-6,1l-18-6l-2-17l-3,13l-8-21 l-3,2l0,13l-43,12l-6,9l-43,6l-6,6l67,1l9-0 C142,922,170,913,188,900z';
obj2[4]= 'M189,905 100,921 96,944 107,925 196,909';
// Frank Herbert is a genius.
dune3[0] = 'M789.651,612.665c-75.205-13.229-180.045,29.189-247.215,32.078c-67.168,2.892-214.902-55.596-254.981-57.02c-80.609-2.861-205.862,94.49-292.672,100.213c-15.255,1.007-30.625-0.204-46.191-2.981v364.425l1091.444-8.328V687.689C964.066,678.827,883.855,629.24,789.651,612.665z';
dune3[1] = 'M-132,707c93-1,328-89,431-72 c102,17,188,72,270,68c81-4,199-87,275-85s268,142,268,142 v254H-98L-132,707z';
dune3[2] = 'M1231.049,614.778c-106.1-3.109-270.963,102.704-385.223,108.925c-114.258,6.229-233.418-65.354-377.06-87.139c-99.948-15.158-239.281,33.44-328.552,36.751c-89.269,3.313-285.609-63.696-338.877-65.326c-107.132-3.277-14.89,534.698-14.89,534.698l1120.001-20.622C906.449,1122.064,1337.147,617.889,1231.049,614.778z';
dune3[3] = 'M-47.384,729.587l16.5,334.482H1082.06l-7.499-400.48c0,0-143.994,46.509-293.986,48.009c-138.278,1.383-269.985-73.507-410.979-102.005S-47.384,729.587-47.384,729.587';
dune31[0] = 'M730.696,695.521c-14.66-64.234,54.479-83.549,53.738-83.668c-74.773-10.486-176.365,30.068-241.998,32.891c-65.18,2.806-206.219-52.184-251.139-56.739c10.547,3.674,18.777,12.776,20.959,31.223c5.711,48.342-25.114,246.768-200.632,410.215l572.048,6.992h0.246c157.754-55.303,336.631-126.377,336.631-164.342C1020.549,804.177,747.467,768.968,730.696,695.521z';
dune31[1] = 'M569,702 c-81,4-167-51-270-68c-90-14-282,51-391,68l-6,301l0,8h750 C841,871,874,687,868,644c-2-15-9-23-19-26c-1-0-2-0-3-0 C769,615,651,698,569,702z';
dune31[2] = 'M390.417,731.489c-19.484-73.591,72.4-95.72,71.42-95.854c-99.376-12.017-234.395,34.446-321.621,37.682c-54.263,2.01-148.083-21.957-225.287-41.429c5.73,98.433,58.558,405.557,495.521,392.111c96.733-2.977,150.2,2.841,173.166,14.275c110.086-40.351,192.021-78.959,192.021-104.494C775.637,855.974,412.705,815.635,390.417,731.489z';
dune31[3] = 'M1143.557,771.596C842.766,774.434,590.294,994.69,563.871,1018.5H281.277c219.414-27.692,269.289-134.762,270.71-200.116c1.5-68.996-181.491-76.496-295.484-116.994c-107.063-38.035,57.096-89.3,77.455-95.395C186.829,603.571-47.384,729.587-47.384,729.587l14.307,321.913l1176.634,27.58C1143.557,1079.08,1461.541,768.596,1143.557,771.596z';
dune32[0] = 'M312.256,619.224c-2.186-18.486-10.448-27.592-21.027-31.25c-1.286-0.119-2.543-0.203-3.773-0.246c-80.611-2.863-205.862,94.489-292.671,100.211c-15.255,1.007-30.627-0.204-46.193-2.981v369.479H83.292C283.871,886.871,318.262,670.06,312.256,619.224z';
dune32[1] = 'M296,634 c-104-14-335,72-428,73l33,306h296c150-49,320-113,320-147 c0-60-259-92-275-158C229,651,283,636,296,634z';
dune32[2] = '';
dune32[3] = '';
// His War of the Worlds is a masterpiece.
xtypes[0] = 438473426514619468937593363674906600980101972218980261389738755026321310;
xtypes[1] = 1528428735494740386746687706769036728542265312936553054402188188078571243;
xtypes[2] = 1576159433658212066304323894815932062177799089437395523990699050641915806;
xtypes[3] = 1638277479168345925933593678264841420808332802796276121428815506753716126;
xtypes[4] = 1482277213785937432487838137602393875317079519468030334287176488800222955;
xtypes[5] = 569254049910285240562266942057277174170434705955446158280559749706542294;
xtypes[6] = 695961355261660318153968727586838433117983201812599465335857818068058111;
xtypes[7] = 1499951127606893309180610179916526153806597374206025036948893607141571007;
xtypes[8] = 1487975643258097207966143169235216509055880303550960490725369271497513569;
xtypes[9] = 893871907223691020346594411790439061317907470229888515211998968157829111;
xtypes[10] = 1456322660702981972363882139452691332072845879862426480408917545756655090;
xtypes[11] = 1414100953265237643112910920600703942226523030837917351177428632577495874;
xtypes[12] = 1412526850302830771701738382967853559447456676243931652623233627352724185;
xtypes[13] = 956176030089680310714094738241368283497248873645169781803481032958345082;
xtypes[14] = 407203048447432245888292259364249687668615656070679106091707478370827939;
xtypes[15] = 720473443048720196433395035253138729115353664155452813862022957330631299;
xtypes[16] = 1219326055746586710817491577091388615;
pos = (params[1]-1) * 5;
colors[0] = toHashCode(xtypes[pos/10] / (16777216 ** (pos%10)) % 16777216);
pos = (params[1]-1) * 5 + 1;
colors[1] = toHashCode(xtypes[pos/10] / (16777216 ** (pos%10)) % 16777216);
pos = (params[1]-1) * 5 + 2;
colors[2] = toHashCode(xtypes[pos/10] / (16777216 ** (pos%10)) % 16777216);
pos = (params[1]-1) * 5 + 3;
colors[3] = toHashCode(xtypes[pos/10] / (16777216 ** (pos%10)) % 16777216);
pos = (params[1]-1) * 5 + 4;
colors[4] = toHashCode(xtypes[pos/10] / (16777216 ** (pos%10)) % 16777216);
// Who's stronger, the camel or the Bedouin?
parts[0] = '<svg version="1.1" id="Layer_2" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="1000px" height="1000px" viewBox="0 0 1000 1000" enable-background="new 0 0 1000 1000" xml:space="preserve"> <linearGradient id="mainGradient" gradientUnits="userSpaceOnUse" x1="-162.3992" y1="118.0994" x2="-162.3993" y2="1117.9104" gradientTransform="matrix(1 0 0 -1 662.3999 1118.0991)"> <stop offset="0.64" style="stop-color:#'; // 2
parts[1] = '"/> <stop offset="1" style="stop-color:#'; // 3
parts[2] = '"/> </linearGradient> <rect x="0.001" y="0.189" fill="url(#mainGradient)" width="1000" height="1000"/> <circle opacity="0.1" fill="#'; // 1
parts[3] = string(abi.encodePacked('" cx="44" cy="823" r="99"/> <radialGradient id="sunGradient" ',getSun(params[7]*2-2),' gradientUnits="userSpaceOnUse"> <stop offset="0.7" style="stop-color:#')); // 1
parts[4] = '"/> <stop offset="1" style="stop-color:#'; // 2
parts[5] = string(abi.encodePacked('"/> </radialGradient> <circle opacity="0.8" fill="url(#sunGradient)" ',getSun(params[7]*2-2),'/>')); // 1
parts[6] = ''; // 1
parts[7] = ''; // 2
parts[8] = ''; // 1
parts[9] = ''; // 1
parts[10] = ''; // 2
parts[11] = ''; // 1
parts[12] = ''; // 1
parts[13] = ''; // 2
parts[14] = '<g> <path opacity="0.11" fill="#'; // 1
parts[15] = '" d="M668,423c0,0,313-0,303-28 c-10-28-397-48,15-46c301,2,196,46,460,43 c258-3,484-60,485-17c1,43-290,24-290,50s288,9,478,12 c189,3,341-83,535-26c194,56,322,32,517,5 c194-27,140,0,427,0c287,0,1180,0,1180,0v-31H3607c0,0-137-11-283-10 c-146,0-162,33-394-7c-232-41-312-43-420-24 c-107,18-255,68-395,74s-397,18-398,7c-1-10,447-26,446-65 c-1-38-176-42-391-25c-215,16-395-14-568-19 c-172-4-626-8-627,25s323,25,322,50c-0,9-593,3-593,3H-36v27 h478C442,421,553,423,668,423z"/> <path opacity="0.11" fill="#'; // 1
parts[16] = '" d="M668,404c0,0,322,12,312-15 c-10-28-804-56,8-62c301-2,239,37,503,34 c258-3,565-42,569,1c2,29-381,32-417,61 c-23,18,273,12,470,7c189-5,513-94,714-52 c212,44,184,46,379,18c194-27,188,1,475,1c287,0,1096,0,1096,0 v-20c0,0-1102,0-1175,0s-137-13-284-13c-146,0-161,25-393-16 c-232-41-315-31-422-12c-107,18-250,68-389,74s-432,24-432,13 c0-13,458-25,473-71c12-37-172-54-387-38 c-215,16-395-14-568-19c-172-4-620,7-621,41 c-1,34,319,32,321,51c0,9-598-12-598-12H-36v27h478 C442,403,553,404,668,404z"/> <animateMotion path="M 0 0 L -3750 40 Z" dur="250s" repeatCount="indefinite" /> </g> <path opacity="0.25" fill="#'; // 5
parts[17] = string(abi.encodePacked('" d="',getFarObject(params[5]),'"/> <path fill="#')); // 5
parts[18] = string(abi.encodePacked('" d="',getDune1(params[3]),'"/> <g> <path fill="#')); // 4
parts[19] = string(abi.encodePacked('" d="',getCamel(params[0]),'"/> <animateMotion path="m 0 0 h -5000" dur="2500s" repeatCount="indefinite" /> </g> <path fill="#')); // 4
parts[20] = string(abi.encodePacked('" d="',getDune2(params[4]),'"/> <path fill="#')); // 2
parts[21] = string(abi.encodePacked('" d="',dune3[params[2]-1],'"/> <linearGradient id="sandGradient" gradientUnits="userSpaceOnUse" x1="-1424" y1="658" x2="-456" y2="658" gradientTransform="matrix(1 0 0 1 1324.7998 158.1992)"> <stop offset="0" style="stop-color:#')); // 2
parts[22] = '"/> <stop offset="0.8" style="stop-color:#'; // 3
parts[23] = string(abi.encodePacked('"/> </linearGradient> <path opacity="0.35" fill="url(#sandGradient)" d="',dune31[params[2]-1],'"/> <path opacity="0.35" fill="#')); // 3
parts[24] = string(abi.encodePacked('" d="',dune32[params[2]-1],'"/> <path opacity="0.1" fill="#')); // 3
parts[25] = string(abi.encodePacked('" d="',obj2[params[6]-1],'"/> <path opacity="0.4" fill="#')); // 3
parts[26] = string(abi.encodePacked('" d="',obj1[params[6]-1],'"/> </svg> '));
// Stronger is the earthworm.
string memory output = string(abi.encodePacked(parts[0],colors[1],parts[1],colors[2],parts[2]));
output = string(abi.encodePacked(output,colors[0],parts[3],colors[0],parts[4],colors[1] ));
output = string(abi.encodePacked(output,parts[5],colors[0],parts[6],colors[0] ));
output = string(abi.encodePacked(output,parts[7],colors[1],parts[8],colors[0]));
output = string(abi.encodePacked(output,parts[9],colors[0],parts[10],colors[1] ));
output = string(abi.encodePacked(output,parts[11],colors[0],parts[12],colors[0]));
output = string(abi.encodePacked(output,parts[13],colors[1],parts[14],colors[0] ));
output = string(abi.encodePacked(output,parts[15],colors[0],parts[16],colors[4]));
output = string(abi.encodePacked(output,parts[17],colors[4],parts[18],colors[3] ));
output = string(abi.encodePacked(output,parts[19],colors[3],parts[20],colors[1]));
output = string(abi.encodePacked(output,parts[21],colors[1],parts[22],colors[2]));
output = string(abi.encodePacked(output,parts[23],colors[2],parts[24],colors[2]));
output = string(abi.encodePacked(output,parts[25],colors[2],parts[26]));
// please don't scold me for the quality of my code, I've been programming in PHP for 10 years
string[11] memory aparts;
aparts[0] = '[{ "trait_type": "Main", "value": "';
aparts[1] = toString(params[0]);
aparts[2] = '" }, { "trait_type": "Palette", "value": "';
aparts[3] = toString(params[1]);
aparts[4] = '" }, { "trait_type": "Near Object", "value": "';
aparts[5] = toString(params[6]);
aparts[6] = '" }, { "trait_type": "Far Object", "value": "';
aparts[7] = toString(params[5]);
aparts[8] = '" }, { "trait_type": "Sun", "value": "';
aparts[9] = toString(params[7]);
aparts[10] = '" }]';
// they're going to make me squeeze Doom into the next collection
// help...
string memory strparams = string(abi.encodePacked(aparts[0], aparts[1], aparts[2], aparts[3], aparts[4], aparts[5]));
strparams = string(abi.encodePacked(strparams, aparts[6], aparts[7], aparts[8], aparts[9], aparts[10]));
// they made me write this code
string memory json = Base64.encode(bytes(string(abi.encodePacked('{"name": "OnChain Sands", "description": "Beautiful views, completely generated OnChain","attributes":', strparams, ', "image": "data:image/svg+xml;base64,', Base64.encode(bytes(output)), '"}'))));
output = string(abi.encodePacked('data:application/json;base64,', json));
return output;
}
function claimdQw4w9WgXcQ() public {
require(_tokenIdCounter.current() <= 500, "Tokens number to mint exceeds number of public tokens");
_safeMint(msg.sender, _tokenIdCounter.current());
_tokenIdCounter.increment();
}
// why are you reading this? is there something between us?
function withdraw() public onlyOwner {
uint balance = address(this).balance;
payable(msg.sender).transfer(balance);
}
// they won't fall for it a second time
function buySands(uint tokensNumber) public payable {
require(tokensNumber > 0, "Wrong amount");
require(tokensNumber <= maxTokensPerTransaction, "Max tokens per transaction number exceeded");
require(_tokenIdCounter.current().add(tokensNumber) <= nftsPublicNumber, "Tokens number to mint exceeds number of public tokens");
require(tokenPrice.mul(tokensNumber) <= msg.value, "Ether value sent is too low");
for(uint i = 0; i < tokensNumber; i++) {
_safeMint(msg.sender, _tokenIdCounter.current());
_tokenIdCounter.increment();
}
}
}
/// [MIT License]
/// @title Base64
/// @notice Provides a function for encoding some bytes in base64
/// @author Brecht Devos <[email protected]>
library Base64 {
bytes internal constant TABLE = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/// @notice Encodes some bytes to the base64 representation
function encode(bytes memory data) internal pure returns (string memory) {
uint256 len = data.length;
if (len == 0) return "";
// multiply by 4/3 rounded up
uint256 encodedLen = 4 * ((len + 2) / 3);
// Add some extra buffer at the end
bytes memory result = new bytes(encodedLen + 32);
bytes memory table = TABLE;
assembly {
let tablePtr := add(table, 1)
let resultPtr := add(result, 32)
for {
let i := 0
} lt(i, len) {
} {
i := add(i, 3)
let input := and(mload(add(data, i)), 0xffffff)
let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF))
out := shl(8, out)
out := add(out, and(mload(add(tablePtr, and(input, 0x3F))), 0xFF))
out := shl(224, out)
mstore(resultPtr, out)
resultPtr := add(resultPtr, 4)
}
switch mod(len, 3)
case 1 {
mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
}
case 2 {
mstore(sub(resultPtr, 1), shl(248, 0x3d))
}
mstore(result, encodedLen)
}
return string(result);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.
/**
* @dev Wrappers over Solidity's arithmetic operations.
*
* NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
* now has built in overflow checking.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
uint256 c = a + b;
if (c < a) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the substraction of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b > a) return (false, 0);
return (true, a - b);
}
}
/**
* @dev Returns the multiplication of two unsigned integers, with an overflow flag.
*
* _Available since v3.4._
*/
function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) return (true, 0);
uint256 c = a * b;
if (c / a != b) return (false, 0);
return (true, c);
}
}
/**
* @dev Returns the division of two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a / b);
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
*
* _Available since v3.4._
*/
function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
unchecked {
if (b == 0) return (false, 0);
return (true, a % b);
}
}
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
*
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
return a + b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return a - b;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
*
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
return a * b;
}
/**
* @dev Returns the integer division of two unsigned integers, reverting on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator.
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return a / b;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return a % b;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {trySub}.
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
*
* - Subtraction cannot overflow.
*/
function sub(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b <= a, errorMessage);
return a - b;
}
}
/**
* @dev Returns the integer division of two unsigned integers, reverting with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function div(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a / b;
}
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* reverting with custom message when dividing by zero.
*
* CAUTION: This function is deprecated because it requires allocating memory for the error
* message unnecessarily. For custom revert reasons use {tryMod}.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
*
* - The divisor cannot be zero.
*/
function mod(
uint256 a,
uint256 b,
string memory errorMessage
) internal pure returns (uint256) {
unchecked {
require(b > 0, errorMessage);
return a % b;
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids.
*
* Include with `using Counters for Counters.Counter;`
*/
library Counters {
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
unchecked {
counter._value += 1;
}
}
function decrement(Counter storage counter) internal {
uint256 value = counter._value;
require(value > 0, "Counter: decrement overflow");
unchecked {
counter._value = value - 1;
}
}
function reset(Counter storage counter) internal {
counter._value = 0;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../utils/Context.sol";
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_setOwner(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_setOwner(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_setOwner(newOwner);
}
function _setOwner(address newOwner) private {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../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;
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 "../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 "./IERC165.sol";
/**
* @dev Implementation of the {IERC165} interface.
*
* Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
* for the additional interface id that will be supported. For example:
*
* ```solidity
* function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
* return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
* }
* ```
*
* Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
*/
abstract contract ERC165 is IERC165 {
/**
* @dev See {IERC165-supportsInterface}.
*/
function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
return interfaceId == type(IERC165).interfaceId;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev String operations.
*/
library Strings {
bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
/**
* @dev Converts a `uint256` to its ASCII `string` decimal representation.
*/
function toString(uint256 value) internal pure returns (string memory) {
// Inspired by OraclizeAPI's implementation - MIT licence
// https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol
if (value == 0) {
return "0";
}
uint256 temp = value;
uint256 digits;
while (temp != 0) {
digits++;
temp /= 10;
}
bytes memory buffer = new bytes(digits);
while (value != 0) {
digits -= 1;
buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
value /= 10;
}
return string(buffer);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
*/
function toHexString(uint256 value) internal pure returns (string memory) {
if (value == 0) {
return "0x00";
}
uint256 temp = value;
uint256 length = 0;
while (temp != 0) {
length++;
temp >>= 8;
}
return toHexString(value, length);
}
/**
* @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
*/
function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
bytes memory buffer = new bytes(2 * length + 2);
buffer[0] = "0";
buffer[1] = "x";
for (uint256 i = 2 * length + 1; i > 1; --i) {
buffer[i] = _HEX_SYMBOLS[value & 0xf];
value >>= 4;
}
require(value == 0, "Strings: hex length insufficient");
return string(buffer);
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
assembly {
size := extcodesize(account)
}
return size > 0;
}
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
require(address(this).balance >= amount, "Address: insufficient balance");
(bool success, ) = recipient.call{value: amount}("");
require(success, "Address: unable to send value, recipient may have reverted");
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - `target` must be a contract.
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
return functionCall(target, data, "Address: low-level call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
* `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
return functionCallWithValue(target, data, 0, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but also transferring `value` wei to `target`.
*
* Requirements:
*
* - the calling contract must have an ETH balance of at least `value`.
* - the called Solidity function must be `payable`.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
}
/**
* @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
* with `errorMessage` as a fallback revert reason when `target` reverts.
*
* _Available since v3.1._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value,
string memory errorMessage
) internal returns (bytes memory) {
require(address(this).balance >= value, "Address: insufficient balance for call");
require(isContract(target), "Address: call to non-contract");
(bool success, bytes memory returndata) = target.call{value: value}(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
return functionStaticCall(target, data, "Address: low-level static call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a static call.
*
* _Available since v3.3._
*/
function functionStaticCall(
address target,
bytes memory data,
string memory errorMessage
) internal view returns (bytes memory) {
require(isContract(target), "Address: static call to non-contract");
(bool success, bytes memory returndata) = target.staticcall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
return functionDelegateCall(target, data, "Address: low-level delegate call failed");
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(
address target,
bytes memory data,
string memory errorMessage
) internal returns (bytes memory) {
require(isContract(target), "Address: delegate call to non-contract");
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata, errorMessage);
}
/**
* @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
* revert reason using the provided one.
*
* _Available since v4.3._
*/
function verifyCallResult(
bool success,
bytes memory returndata,
string memory errorMessage
) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
revert(errorMessage);
}
}
}
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
interface IERC721Metadata is IERC721 {
/**
* @dev Returns the token collection name.
*/
function name() external view returns (string memory);
/**
* @dev Returns the token collection symbol.
*/
function symbol() external view returns (string memory);
/**
* @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
*/
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
interface IERC721Receiver {
/**
* @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
* by `operator` from `from`, this function is called.
*
* It must return its Solidity selector to confirm the token transfer.
* If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
*
* The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
*/
function onERC721Received(
address operator,
address from,
uint256 tokenId,
bytes calldata data
) external returns (bytes4);
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "../../utils/introspection/IERC165.sol";
/**
* @dev Required interface of an ERC721 compliant contract.
*/
interface IERC721 is IERC165 {
/**
* @dev Emitted when `tokenId` token is transferred from `from` to `to`.
*/
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
*/
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
/**
* @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
*/
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
/**
* @dev Returns the number of tokens in ``owner``'s account.
*/
function balanceOf(address owner) external view returns (uint256 balance);
/**
* @dev Returns the owner of the `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function ownerOf(uint256 tokenId) external view returns (address owner);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
* are aware of the ERC721 protocol to prevent tokens from being forever locked.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Transfers `tokenId` token from `from` to `to`.
*
* WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address from,
address to,
uint256 tokenId
) external;
/**
* @dev Gives permission to `to` to transfer `tokenId` token to another account.
* The approval is cleared when the token is transferred.
*
* Only a single account can be approved at a time, so approving the zero address clears previous approvals.
*
* Requirements:
*
* - The caller must own the token or be an approved operator.
* - `tokenId` must exist.
*
* Emits an {Approval} event.
*/
function approve(address to, uint256 tokenId) external;
/**
* @dev Returns the account approved for `tokenId` token.
*
* Requirements:
*
* - `tokenId` must exist.
*/
function getApproved(uint256 tokenId) external view returns (address operator);
/**
* @dev Approve or remove `operator` as an operator for the caller.
* Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
*
* Requirements:
*
* - The `operator` cannot be the caller.
*
* Emits an {ApprovalForAll} event.
*/
function setApprovalForAll(address operator, bool _approved) external;
/**
* @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
*
* See {setApprovalForAll}
*/
function isApprovedForAll(address owner, address operator) external view returns (bool);
/**
* @dev Safely transfers `tokenId` token from `from` to `to`.
*
* Requirements:
*
* - `from` cannot be the zero address.
* - `to` cannot be the zero address.
* - `tokenId` token must exist and be owned by `from`.
* - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
* - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
*
* Emits a {Transfer} event.
*/
function safeTransferFrom(
address from,
address to,
uint256 tokenId,
bytes calldata data
) external;
}
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Interface of the ERC165 standard, as defined in the
* https://eips.ethereum.org/EIPS/eip-165[EIP].
*
* Implementers can declare support of contract interfaces, which can then be
* queried by others ({ERC165Checker}).
*
* For an implementation, see {ERC165}.
*/
interface IERC165 {
/**
* @dev Returns true if this contract implements the interface defined by
* `interfaceId`. See the corresponding
* https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
* to learn more about how these ids are created.
*
* This function call must use less than 30 000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}