update all contracts
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/access/Ownable.sol";
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import "./DTLToken.sol";
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import "./NftCertificate.sol";
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contract CubLearn is Ownable {
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DTLToken dtlContract;
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NftCertificate cubcertContract;
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uint256 public cashbackPercentage;
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// course id => price in DTL
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mapping(string => uint256) private coursePrices;
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// course id => student address => is enrolled
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mapping(string => mapping(address => bool)) private enrolledCourses;
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// course id => student address => is certificate issued
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mapping(string => mapping(address => bool)) private issuedCertificates;
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constructor(address dtlContractAddress, address cubcertContractAddress) Ownable(msg.sender) {
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dtlContract = DTLToken(dtlContractAddress);
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cubcertContract = NftCertificate(cubcertContractAddress);
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coursePrices["1"] = 300;
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coursePrices["2"] = 500;
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coursePrices["3"] = 200;
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cashbackPercentage = 50;
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}
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function setCashbackPercentage(uint256 newValue) external onlyOwner {
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require(newValue <= 100, "Cashback percentage cannot be more than 100.");
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cashbackPercentage = newValue;
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}
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function enroll(string memory courseId) external {
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require(coursePrices[courseId] != 0, "Course not found.");
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dtlContract.transferFrom(msg.sender, address(this), coursePrices[courseId]);
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enrolledCourses[courseId][msg.sender] = true;
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}
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function finishCourse(
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string memory courseId,
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string memory studentFullName,
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string memory courseName,
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string memory instructorFullName
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) external {
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require(enrolledCourses[courseId][msg.sender], "Must be enrolled in course.");
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require(!issuedCertificates[courseId][msg.sender], "Certificate already issued.");
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cubcertContract.mintCertificate(msg.sender, studentFullName, courseName, instructorFullName);
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// Mark the certificate as issued
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issuedCertificates[courseId][msg.sender] = true;
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// Cashback
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uint256 cashbackAmount = coursePrices[courseId] * cashbackPercentage / 100;
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dtlContract.transfer(msg.sender, cashbackAmount);
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}
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function getDTLBalance() external view onlyOwner returns (uint256) {
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return dtlContract.balanceOf(address(this));
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}
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function transferAllDTLBalanceToMe() external onlyOwner {
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uint256 balance = dtlContract.balanceOf(address(this));
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dtlContract.transfer(msg.sender, balance);
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}
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}
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@ -0,0 +1,18 @@
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
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contract DTLToken is ERC20 {
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constructor(address initialHolder) ERC20("Digital Turkish Lira", "DTL") {
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_mint(initialHolder, 1000000000);
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}
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function decimals() public view virtual override returns (uint8) {
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return 0;
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}
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function approveMax(address spender) external returns (bool) {
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return approve(spender, totalSupply());
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}
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}
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@ -8,100 +8,92 @@ import "@openzeppelin/contracts/utils/Base64.sol";
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contract NftCertificate is ERC721 {
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contract NftCertificate is ERC721 {
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using Strings for uint256;
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using Strings for uint256;
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uint256 public nextTokenId;
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uint256 public nextTokenId;
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mapping(uint256 => CertificateInfo) private certificateInfoMapping;
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mapping(uint256 => CertificateInfo) private certificateInfoMapping;
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// course id => student address => is cert issued
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struct CertificateInfo {
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mapping(string => mapping(address => bool)) private issuedCertificates;
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string studentFullName;
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string courseName;
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string instructorFullName;
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}
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struct CertificateInfo {
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constructor() ERC721("CubLearn Certificate", "CUBCERT") {}
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string studentFullName;
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string courseName;
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string instructorFullName;
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}
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constructor() ERC721("CubLearn Certificate", "CUBCERT") {}
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function mintCertificate(
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string memory courseId,
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string memory studentFullName,
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string memory courseName,
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string memory instructorFullName
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) external {
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require(!issuedCertificates[courseId][msg.sender], "Certificate already issued.");
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function mintCertificate(
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address recipient,
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string memory studentFullName,
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string memory courseName,
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string memory instructorFullName
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) external {
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uint256 tokenId = nextTokenId;
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uint256 tokenId = nextTokenId;
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_storeCertificateInfo(tokenId, studentFullName, courseName, instructorFullName);
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_storeCertificateInfo(tokenId, studentFullName, courseName, instructorFullName);
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_safeMint(msg.sender, tokenId);
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_safeMint(recipient, tokenId);
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// Mark the certificate as issued
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nextTokenId++;
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issuedCertificates[courseId][msg.sender] = true;
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}
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nextTokenId++;
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function _storeCertificateInfo(
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}
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uint256 tokenId,
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string memory studentFullName,
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string memory courseName,
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string memory instructorFullName
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) internal {
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certificateInfoMapping[tokenId] = CertificateInfo({
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studentFullName: studentFullName,
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courseName: courseName,
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instructorFullName: instructorFullName
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});
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}
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function _storeCertificateInfo(
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function getCertificateInfo(uint256 tokenId)
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uint256 tokenId,
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external
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string memory studentFullName,
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view
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string memory courseName,
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returns (
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string memory instructorFullName
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CertificateInfo memory certInfo
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) internal {
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)
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certificateInfoMapping[tokenId] = CertificateInfo({
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{
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studentFullName: studentFullName,
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return certificateInfoMapping[tokenId];
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courseName: courseName,
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}
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instructorFullName: instructorFullName
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});
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}
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function getCertificateInfo(uint256 tokenId)
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external
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view
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returns (
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CertificateInfo memory certInfo
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)
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{
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return certificateInfoMapping[tokenId];
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}
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function _getSvg(uint256 tokenId) internal view returns (string memory) {
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function _getSvg(uint256 tokenId) internal view returns (string memory) {
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CertificateInfo storage certInfo = certificateInfoMapping[tokenId];
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CertificateInfo storage certInfo = certificateInfoMapping[tokenId];
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string memory svg = string(
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string memory svg = string(
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abi.encodePacked(
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abi.encodePacked(
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unicode"data:image/svg+xml;utf8,<svg width='1024' height='1024' version='1.1' viewBox='0 0 270.93 270.93' xmlns='http://www.w3.org/2000/svg'><g stroke-width='1.75'><rect width='270.93' height='270.93' fill='#fff'/><text x='15.531887' y='33.715561' fill='#000000' font-family='Avenir' font-size='25.4px' letter-spacing='0px' xml:space='preserve'><tspan x='15.531887' y='33.715561' fill='#000000' font-family='Avenir' stroke-width='1.75'>Cub</tspan></text><text x='149.14455' y='33.867962' fill='#000000' font-family='Avenir' font-size='12.7px' letter-spacing='0px' xml:space='preserve'><tspan x='149.14455' y='33.867962' fill='#000000' font-family='Avenir' font-size='12.7px' stroke-width='1.75'>#",
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unicode"data:image/svg+xml;utf8,<svg width='1024' height='1024' version='1.1' viewBox='0 0 270.93 270.93' xmlns='http://www.w3.org/2000/svg'><g stroke-width='1.75'><rect width='270.93' height='270.93' fill='#fff'/><text x='15.531887' y='33.715561' fill='#000000' font-family='Avenir' font-size='25.4px' letter-spacing='0px' xml:space='preserve'><tspan x='15.531887' y='33.715561' fill='#000000' font-family='Avenir' stroke-width='1.75'>Cub</tspan></text><text x='149.14455' y='33.867962' fill='#000000' font-family='Avenir' font-size='12.7px' letter-spacing='0px' xml:space='preserve'><tspan x='149.14455' y='33.867962' fill='#000000' font-family='Avenir' font-size='12.7px' stroke-width='1.75'>#",
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tokenId.toString(),
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tokenId.toString(),
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unicode"</tspan></text><g font-family='Avenir' letter-spacing='0px'><text x='63.156933' y='33.715561' fill='#a11235' font-size='25.4px' xml:space='preserve'><tspan x='63.156933' y='33.715561' fill='#a11235' font-family='Avenir' stroke-width='1.75'>Learn</tspan></text><g><text x='16.209221' y='92.678009' fill='#a11235' font-size='11.289px' xml:space='preserve'><tspan x='16.209221' y='92.678009' font-size='11.289px' stroke-width='1.75'>ÖĞRENCİ</tspan></text><text x='15.531888' y='116.36742' fill='#000000' font-size='22.578px' xml:space='preserve'><tspan x='15.531888' y='116.36742' fill='#000000' font-size='22.578px' stroke-width='1.75'>",
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unicode"</tspan></text><g font-family='Avenir' letter-spacing='0px'><text x='63.156933' y='33.715561' fill='#a11235' font-size='25.4px' xml:space='preserve'><tspan x='63.156933' y='33.715561' fill='#a11235' font-family='Avenir' stroke-width='1.75'>Learn</tspan></text><g><text x='16.209221' y='92.678009' fill='#a11235' font-size='11.289px' xml:space='preserve'><tspan x='16.209221' y='92.678009' font-size='11.289px' stroke-width='1.75'>ÖĞRENCİ</tspan></text><text x='15.531888' y='116.36742' fill='#000000' font-size='22.578px' xml:space='preserve'><tspan x='15.531888' y='116.36742' fill='#000000' font-size='22.578px' stroke-width='1.75'>",
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certInfo.studentFullName,
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certInfo.studentFullName,
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"</tspan></text><text x='16.209221' y='143.1333' fill='#a11235' font-size='11.289px' xml:space='preserve'><tspan x='16.209221' y='143.1333' font-size='11.289px' stroke-width='1.75'>KURS</tspan></text><text x='15.531888' y='166.82274' fill='#000000' font-size='22.578px' xml:space='preserve'><tspan x='15.531888' y='166.82274' fill='#000000' font-size='22.578px' stroke-width='1.75'>",
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"</tspan></text><text x='16.209221' y='143.1333' fill='#a11235' font-size='11.289px' xml:space='preserve'><tspan x='16.209221' y='143.1333' font-size='11.289px' stroke-width='1.75'>KURS</tspan></text><text x='15.531888' y='166.82274' fill='#000000' font-size='22.578px' xml:space='preserve'><tspan x='15.531888' y='166.82274' fill='#000000' font-size='22.578px' stroke-width='1.75'>",
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certInfo.courseName,
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certInfo.courseName,
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unicode"</tspan></text><text x='16.209221' y='193.58873' fill='#a11235' font-size='11.289px' xml:space='preserve'><tspan x='16.209221' y='193.58873' font-size='11.289px' stroke-width='1.75'>EĞİTMEN</tspan></text><text x='15.531888' y='217.27815' fill='#000000' font-size='22.578px' xml:space='preserve'><tspan x='15.531888' y='217.27815' fill='#000000' font-size='22.578px' stroke-width='1.75'>",
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unicode"</tspan></text><text x='16.209221' y='193.58873' fill='#a11235' font-size='11.289px' xml:space='preserve'><tspan x='16.209221' y='193.58873' font-size='11.289px' stroke-width='1.75'>EĞİTMEN</tspan></text><text x='15.531888' y='217.27815' fill='#000000' font-size='22.578px' xml:space='preserve'><tspan x='15.531888' y='217.27815' fill='#000000' font-size='22.578px' stroke-width='1.75'>",
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certInfo.instructorFullName,
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certInfo.instructorFullName,
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"</tspan></text></g></g></g></svg>"
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"</tspan></text></g></g></g></svg>"
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)
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)
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);
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);
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return svg;
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return svg;
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}
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}
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function tokenURI(uint256 tokenId)
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function tokenURI(uint256 tokenId)
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external
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public
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view
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view
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override
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override
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returns (string memory)
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returns (string memory)
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{
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{
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bytes memory json = abi.encodePacked(
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bytes memory json = abi.encodePacked(
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'{',
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'{',
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'"name": "CubLearn Certificate #', tokenId.toString(), '",',
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'"name": "CubLearn Certificate #', tokenId.toString(), '",',
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'"image_data": "', _getSvg(tokenId), '"',
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'"image_data": "', _getSvg(tokenId), '"',
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'}'
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'}'
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);
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);
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return string(
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return string(
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abi.encodePacked(
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abi.encodePacked(
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"data:application/json;base64,",
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"data:application/json;base64,",
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Base64.encode(json)
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Base64.encode(json)
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)
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)
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);
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);
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}
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}
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}
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}
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