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| pragma solidity ^0.8.0; | |
| import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol"; | |
| contract sciencefaction is ERC1155 { | |
| uint256 public constant DECENTRAFISH = 0x01559ae4021a4dcafee8abc36a5139b96d58cbba2fe6cd347c4ed6668011aac5; | |
| uint256 public constant NFThistory = 0x01559ae4021a99b0d373d7bc8a80504bad782367abe12c21373c83adc6bf6a7e; | |
| uint256 public constant IPFSforscher = 0x01559ae4021a9c84fa506cb76691054c2b92f655222cde2437d77ed21c083c4d; | |
| constructor() public ERC1155("ipfs://f0{id}") { | |
| _mint(msg.sender, DECENTRAFISH, 1, ""); | |
| _mint(msg.sender, NFThistory, 1, ""); | |
| _mint(msg.sender, IPFSforscher, 1, ""); | |
| } | |
| function mint( | |
| address to, | |
| uint256 id, | |
| uint256 amount, | |
| bytes memory data | |
| ) public virtual { | |
| _mint(msg.sender, id, amount, data); | |
| } | |
| function uint2hexstr(uint256 i) public pure returns (string memory) { | |
| if (i == 0) return "0"; | |
| uint j = i; | |
| uint length; | |
| while (j != 0) { | |
| length++; | |
| j = j >> 4; | |
| } | |
| uint mask = 15; | |
| bytes memory bstr = new bytes(length); | |
| uint k = length; | |
| while (i != 0) { | |
| uint curr = (i & mask); | |
| bstr[--k] = curr > 9 ? | |
| bytes1(uint8(55 + curr)) : | |
| bytes1(uint8(48 + curr)); // 55 = 65 - 10 | |
| i = i >> 4; | |
| } | |
| return string(bstr); | |
| } | |
| function uri(uint256 _tokenID) override public view returns (string memory) { | |
| string memory hexstringtokenID; | |
| hexstringtokenID = uint2hexstr(_tokenID); | |
| return string( | |
| abi.encodePacked( | |
| "ipfs://f0", | |
| hexstringtokenID) | |
| ); | |
| } | |
| } |
Hi sir, may i know how can i apply this idea into my dapp marketplace which has a form to create new NFT token? And the frontend is actually built using VueJS.
Does that mean i need to convert the IPFS CID to hex format upon upload using nodejs? I can't find any nodejs library which allowed us to convert the CID into hex.
+1 on above.. I've spent quite a while trying to work how to get the CID into hex in js but haven't managed.
I checked https://cid.ipfs.io/ and I see a 'DIGEST (HEX)' for my CID which I think could be the correct value but I'm not sure. Is there some library out there that can help?
PS. Very cool work around to the fixed erc1155 uri limitation!
@chrisalmeida here is example how you can get v1 CID
https://gist.github.com/tarassh/5d4f0bf32288771e9a5679da0bd82ac6
Hi, @soenkeba. What would it take to convert the result from below into a v0 CID within the same contract?