100 lines
4.2 KiB
Solidity
100 lines
4.2 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.0;
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import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
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import "@openzeppelin/contracts/utils/Strings.sol";
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import "@openzeppelin/contracts/utils/Base64.sol";
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contract NftCertificate is ERC721 {
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using Strings for uint256;
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uint256 public nextTokenId;
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mapping(uint256 => CertificateInfo) private certificateInfoMapping;
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struct CertificateInfo {
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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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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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_storeCertificateInfo(tokenId, studentFullName, courseName, instructorFullName);
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_safeMint(recipient, tokenId);
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nextTokenId++;
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}
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function _storeCertificateInfo(
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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 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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CertificateInfo storage certInfo = certificateInfoMapping[tokenId];
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string memory svg = string(
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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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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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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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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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certInfo.instructorFullName,
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"</tspan></text></g></g></g></svg>"
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)
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);
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return svg;
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}
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function tokenURI(uint256 tokenId)
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public
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view
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override
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returns (string memory)
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{
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bytes memory json = abi.encodePacked(
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'{',
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'"name": "CubLearn Certificate #', tokenId.toString(), '",',
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'"image_data": "', _getSvg(tokenId), '"',
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'}'
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);
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return string(
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abi.encodePacked(
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"data:application/json;base64,",
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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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