feat: Non transferable token extensions #692
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| @@ -180,6 +180,14 @@ export const ERC725YDataKeys = { | |||
| LSP9: { | |||
| SupportedStandards_LSP9: SupportedStandards.LSP9Vault.key, | |||
| }, | |||
| LSP7: { | |||
| // keccak256('LSP7NonTransferable') | |||
| LSP7NonTransferable: '0xb48a0085fb2c841c614d8c650033c5b790f407c071b9176ca4f2003db3613a1f', | |||
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We would have these data keys first. I would suggest opening an issue in the LIP repo to discuss this first.
@YamenMerhi @skimaharvey @b00ste
https://github.com/lukso-network/LIPs/issues
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Issue created: lukso-network/LIPs#231
| ) internal virtual override { | ||
| if (dataKey == _LSP7_NON_TRANSFERABLE) { | ||
| revert LSP7NonTransferableNotEditable(); | ||
| } else { |
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I believe the else is not needed here. But not a big deal.
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| /** | ||
| * @dev the ERC725Y data key `LSP7NonTransferable` cannot be changed | ||
| * via this function once the digital asset contract has been deployed. |
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Please remove the indent here in the Natspec comments, so that they can be parsed correctly in the auto-generated docs in docs.lukso.tech
| * via this function once the digital asset contract has been deployed. | |
| * via this function once the digital asset contract has been deployed. |
| bytes memory data | ||
| ) internal virtual override { | ||
| revert("LSP7: Token is non-transferable"); | ||
| from; |
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Could you please comment the variable names instead to silence the solc compiler warning. Like this:
function _transfer(
address /* from */,
address /* to */,
uint256 /* amount */,
bool /* allowNonLSP1Recipient */,
bytes memory /* data */
) internal virtual override {
revert("LSP7: Token is non-transferable");
}| } | ||
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| /** | ||
| * @notice This function override _transfer function to make it non-transferable |
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| * @notice This function override _transfer function to make it non-transferable | |
| * @dev This function override _transfer function to make it non-transferable |
| /** | ||
| * @notice Deploying a `LSP7NonTransferable` token contract with: token name = `name_`, token symbol = `symbol_`, | ||
| * address `newOwner_` as the token contract owner, and _isNonDivisible_ = `isNonDivisible_`. | ||
| * Set the non-transferable flag. |
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Small suggestion
| * Set the non-transferable flag. | |
| * Switch ON the non-transferable flag. |
| * @param name_ The name of the token. | ||
| * @param symbol_ The symbol of the token. | ||
| * @param newOwner_ The owner of the token contract. | ||
| * @param isNonDivisible_ Specify if the LSP7 token is a fungible or non-fungible token |
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This is not correct. If this parameter is true, the token is still a fungible token.
| * @param isNonDivisible_ Specify if the LSP7 token is a fungible or non-fungible token | |
| * @param isNonDivisible_ Specify if the tokens from this contract can be divided in smaller units or not. |
| } | ||
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| /** | ||
| * @notice This function override _transfer function to make it non-transferable |
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| * @notice This function override _transfer function to make it non-transferable | |
| * @notice This function override the internal `_transfer` function to make it non-transferable |
| * @param name_ The name of the token. | ||
| * @param symbol_ The symbol of the token. | ||
| * @param newOwner_ The owner of the token contract. | ||
| * @param isNonDivisible_ Specify if the LSP7 token is a fungible or non-fungible token |
samuel-videau
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Closing this PR as similar to #804 and #805 We need more inputs and clarify more the roadmap on the Token extension for tokens and NFTs. PR could be re-opened tho in the future if we consider this is relevant. Also this feature might not require a token extension, as it can be easily done by overriding the internal |
What does this PR introduce?
🚀 Feature
This PR introduce an extension to make tokens (LSP7 or LSP8) non-transferable.
In these extensions, the _transfer functions are overriten to revert if called.
A flag (as a ERC725Y key) is added, in order to let application/smart contracts know if they are dealing with a non-transferable token. This flag can't be edited after contract deployment or initialization.
Thoughts:
authorizeOperator?PR Checklist
npm run lint&&npm run lint:solidity(solhint)npm run format(prettier)npm run buildnpm run test