Why isn't there an ERC1155 Mintable?

antron3000 · October 16, 2020, 4:07am

Just wondering, is there any particular reason why OZ hasn’t included an ERC1155Mintable module? I see Pausable and Burnable Modules are there.

abcoathup · October 16, 2020, 6:04am

Hi @antron3000,

Welcome to the community

OpenZeppelin Contracts v3.x uses AccessControl which provides a great deal of flexibility in defining roles. With this flexibility in mind, there isn’t an opinionated mintable contract.

We can use the preset ERC1155 contract that is opinionated and includes mint and mintBatch functionality which can only be called from accounts with the MINTER_ROLE.

Alternatively if you want to create your own contract extending from the ERC1155 implementation you can use the preset contract as a reference.

github.com

OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/presets/ERC1155PresetMinterPauser.sol#L49-L62


function mint(address to, uint256 id, uint256 amount, bytes memory data) public virtual {
    require(hasRole(MINTER_ROLE, _msgSender()), "ERC1155PresetMinterPauser: must have minter role to mint");

    _mint(to, id, amount, data);
}

/**
 * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] variant of {mint}.
 */
function mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data) public virtual {
    require(hasRole(MINTER_ROLE, _msgSender()), "ERC1155PresetMinterPauser: must have minter role to mint");

    _mintBatch(to, ids, amounts, data);
}

Feel free to ask all the questions that you need.

antron3000 · October 16, 2020, 8:43pm

Got it, thank you for the answer!

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Why isn't there an ERC1155 Mintable?

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