From d3e2c9d8059a9dc39df22bbf1ffd5edd03bd75e8 Mon Sep 17 00:00:00 2001
From: itzelot01 <itzeltellez59@aragon.unam.mx>
Date: Tue, 24 Oct 2023 23:40:56 +0000
Subject: [PATCH] Adding NFTs Base Template

---
 src/DCO2s.sol | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 src/DCO2s.sol

diff --git a/src/DCO2s.sol b/src/DCO2s.sol
new file mode 100644
index 0000000..99beef7
--- /dev/null
+++ b/src/DCO2s.sol
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity ^0.8.20;
+
+import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
+import "@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol";
+import "@openzeppelin/contracts/access/AccessControl.sol";
+
+/// @custom:security-contact david@neetsec.com
+contract DCO2s is ERC721, ERC721Enumerable, AccessControl {
+    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
+    uint256 private _nextTokenId;
+
+    constructor(address defaultAdmin, address minter) ERC721("DCO2s", "DCO2") {
+        _grantRole(DEFAULT_ADMIN_ROLE, defaultAdmin);
+        _grantRole(MINTER_ROLE, minter);
+    }
+
+    function _baseURI() internal pure override returns (string memory) {
+        return "https://gateway.decentralizedscience.org/ipfs/";
+    }
+
+    function safeMint(address to) public onlyRole(MINTER_ROLE) {
+        uint256 tokenId = _nextTokenId++;
+        _safeMint(to, tokenId);
+    }
+
+    // The following functions are overrides required by Solidity.
+
+    function _update(address to, uint256 tokenId, address auth)
+        internal
+        override(ERC721, ERC721Enumerable)
+        returns (address)
+    {
+        return super._update(to, tokenId, auth);
+    }
+
+    function _increaseBalance(address account, uint128 value)
+        internal
+        override(ERC721, ERC721Enumerable)
+    {
+        super._increaseBalance(account, value);
+    }
+
+    function supportsInterface(bytes4 interfaceId)
+        public
+        view
+        override(ERC721, ERC721Enumerable, AccessControl)
+        returns (bool)
+    {
+        return super.supportsInterface(interfaceId);
+    }
+}