feat!: allow Operator to revoke himself

constants.ts

@@ -29,7 +29,7 @@ export const INTERFACE_IDS = {
   LSP1UniversalReceiver: '0x6bb56a14',
   LSP1UniversalReceiverDelegate: '0xa245bbda',
   LSP6KeyManager: '0x23f34c62',
-  LSP7DigitalAsset: '0xb3c4928f',
+  LSP7DigitalAsset: '0xc52d6008',
   LSP8IdentifiableDigitalAsset: '0x3a271706',
   LSP9Vault: '0x28af17e6',
   LSP11BasicSocialRecovery: '0x049a28f1',

contracts/LSP7DigitalAsset/ILSP7DigitalAsset.sol

@@ -122,21 +122,23 @@ interface ILSP7DigitalAsset is IERC165, IERC725Y {
     ) external;
 
     /**
-     * @dev Removes the `operator` address as an operator of callers tokens, disallowing it to send any amount of tokens
-     * on behalf of the token owner (the caller of the function `msg.sender`). See also {authorizedAmountFor}.
+     * @dev Enables `tokenOwner` to remove `operator` for its tokens, disallowing it to send any amount of tokens on its behalf.
+     * This function also allows the `operator` to remove itself if it is the caller of this function
      *
      * @param operator The address to revoke as an operator.
+     * @param tokenOwner The address of the token owner.
      * @param notify Boolean indicating whether to notify the operator or not.
      * @param operatorNotificationData The data to notify the operator about via LSP1.
      *
      * @custom:requirements
-     * - `operator` cannot be calling address.
+     * - caller MUST be `operator` or `tokenOwner`
      * - `operator` cannot be the zero address.
      *
      * @custom:events {OperatorRevoked} event with address of the operator being revoked for the caller (token holder).
      */
     function revokeOperator(
         address operator,
+        address tokenOwner,
         bool notify,
         bytes memory operatorNotificationData
     ) external;
@@ -184,6 +186,7 @@ interface ILSP7DigitalAsset is IERC165, IERC725Y {
      *    indicating `operator` does not have any alauthorizedAmountForlowance left for `msg.sender`.
      *
      * @param operator The operator to decrease allowance for `msg.sender`
+     * @param tokenOwner The address of the token owner.
      * @param subtractedAmount The amount to decrease by in the operator's allowance.
      *
      * @custom:requirements
@@ -192,6 +195,7 @@ interface ILSP7DigitalAsset is IERC165, IERC725Y {
      */
     function decreaseAllowance(
         address operator,
+        address tokenOwner,
         uint256 subtractedAmount,
         bytes memory operatorNotificationData
     ) external;

contracts/LSP7DigitalAsset/LSP7Constants.sol

@@ -2,7 +2,7 @@
 pragma solidity ^0.8.4;
 
 // --- ERC165 interface ids
-bytes4 constant _INTERFACEID_LSP7 = 0xb3c4928f;
+bytes4 constant _INTERFACEID_LSP7 = 0xc52d6008;
 
 // --- Token Hooks
 

contracts/LSP7DigitalAsset/LSP7DigitalAssetCore.sol

@@ -20,7 +20,6 @@ import {LSP1Utils} from "../LSP1UniversalReceiver/LSP1Utils.sol";
 
 // errors
 import {
-    LSP7CannotSendToSelf,
     LSP7AmountExceedsAuthorizedAmount,
     LSP7InvalidTransferBatch,
     LSP7AmountExceedsBalance,
@@ -31,7 +30,9 @@ import {
     LSP7NotifyTokenReceiverContractMissingLSP1Interface,
     LSP7NotifyTokenReceiverIsEOA,
     OperatorAllowanceCannotBeIncreasedFromZero,
-    LSP7BatchCallFailed
+    LSP7BatchCallFailed,
+    LSP7RevokeOperatorNotAuthorized,
+    LSP7DecreaseAllowanceNotAuthorized
 } from "./LSP7Errors.sol";
 
 // constants
@@ -173,11 +174,20 @@ abstract contract LSP7DigitalAssetCore is ILSP7DigitalAsset {
      */
     function revokeOperator(
         address operator,
+        address tokenOwner,
         bool notify,
         bytes memory operatorNotificationData
     ) public virtual override {
+        if (msg.sender != tokenOwner && msg.sender != operator) {
+            revert LSP7RevokeOperatorNotAuthorized(
+                msg.sender,
+                tokenOwner,
+                operator
+            );
+        }
+
         _updateOperator(
-            msg.sender,
+            tokenOwner,
             operator,
             0,
             notify,
@@ -186,7 +196,7 @@ abstract contract LSP7DigitalAssetCore is ILSP7DigitalAsset {
 
         if (notify) {
             bytes memory lsp1Data = abi.encode(
-                msg.sender,
+                tokenOwner,
                 0,
                 operatorNotificationData
             );
@@ -254,10 +264,19 @@ abstract contract LSP7DigitalAssetCore is ILSP7DigitalAsset {
      */
     function decreaseAllowance(
         address operator,
+        address tokenOwner,
         uint256 subtractedAmount,
         bytes memory operatorNotificationData
     ) public virtual override {
-        uint256 currentAllowance = authorizedAmountFor(operator, msg.sender);
+        if (msg.sender != tokenOwner && msg.sender != operator) {
+            revert LSP7DecreaseAllowanceNotAuthorized(
+                msg.sender,
+                tokenOwner,
+                operator
+            );
+        }
+
+        uint256 currentAllowance = authorizedAmountFor(operator, tokenOwner);
         if (currentAllowance < subtractedAmount) {
             revert LSP7DecreasedAllowanceBelowZero();
         }
@@ -266,7 +285,7 @@ abstract contract LSP7DigitalAssetCore is ILSP7DigitalAsset {
         unchecked {
             newAllowance = currentAllowance - subtractedAmount;
             _updateOperator(
-                msg.sender,
+                tokenOwner,
                 operator,
                 newAllowance,
                 true,
@@ -275,7 +294,7 @@ abstract contract LSP7DigitalAssetCore is ILSP7DigitalAsset {
         }
 
         bytes memory lsp1Data = abi.encode(
-            msg.sender,
+            tokenOwner,
             newAllowance,
             operatorNotificationData
         );
@@ -295,8 +314,6 @@ abstract contract LSP7DigitalAssetCore is ILSP7DigitalAsset {
         bool force,
         bytes memory data
     ) public virtual override {
-        if (from == to) revert LSP7CannotSendToSelf();
-
         if (msg.sender != from) {
             _spendAllowance({
                 operator: msg.sender,

contracts/LSP7DigitalAsset/LSP7Errors.sol

@@ -36,11 +36,6 @@ error LSP7CannotUseAddressZeroAsOperator();
  */
 error LSP7CannotSendWithAddressZero();
 
-/**
- * @dev reverts when specifying the same address for `from` or `to` in a token transfer.
- */
-error LSP7CannotSendToSelf();
-
 /**
  * @dev reverts when the array parameters used in {transferBatch} have different lengths.
  */
@@ -88,3 +83,21 @@ error OperatorAllowanceCannotBeIncreasedFromZero(address operator);
  * @notice Batch call failed.
  */
 error LSP7BatchCallFailed(uint256 callIndex);
+
+/**
+ * @dev Reverts when the call to revoke operator is not authorized.
+ */
+error LSP7RevokeOperatorNotAuthorized(
+    address caller,
+    address tokenOwner,
+    address operator
+);
+
+/**
+ * @dev Reverts when the call to decrease allowance is not authorized.
+ */
+error LSP7DecreaseAllowanceNotAuthorized(
+    address caller,
+    address tokenOwner,
+    address operator
+);

contracts/LSP8IdentifiableDigitalAsset/LSP8Errors.sol

@@ -33,11 +33,6 @@ error LSP8CannotUseAddressZeroAsOperator();
  */
 error LSP8CannotSendToAddressZero();
 
-/**
- * @dev Reverts when specifying the same address for `from` and `to` in a token transfer.
- */
-error LSP8CannotSendToSelf();
-
 /**
  * @dev Reverts when `operator` is not an operator for the `tokenId`.
  */
@@ -112,3 +107,12 @@ error LSP8TokenOwnerChanged(
     address oldOwner,
     address newOwner
 );
+
+/**
+ * @dev Reverts when the call to revoke operator is not authorized.
+ */
+error LSP8RevokeOperatorNotAuthorized(
+    address caller,
+    address tokenOwner,
+    bytes32 tokenId
+);

contracts/LSP8IdentifiableDigitalAsset/LSP8IdentifiableDigitalAssetCore.sol

@@ -36,13 +36,13 @@ import {
     LSP8NonExistingOperator,
     LSP8CannotSendToAddressZero,
     LSP8TokenIdAlreadyMinted,
-    LSP8CannotSendToSelf,
     LSP8NotifyTokenReceiverContractMissingLSP1Interface,
     LSP8NotifyTokenReceiverIsEOA,
     LSP8TokenIdsDataLengthMismatch,
     LSP8TokenIdsDataEmptyArray,
     LSP8BatchCallFailed,
-    LSP8TokenOwnerChanged
+    LSP8TokenOwnerChanged,
+    LSP8RevokeOperatorNotAuthorized
 } from "./LSP8Errors.sol";
 
 // constants
@@ -293,8 +293,14 @@ abstract contract LSP8IdentifiableDigitalAssetCore is
     ) public virtual override {
         address tokenOwner = tokenOwnerOf(tokenId);
 
-        if (tokenOwner != msg.sender) {
-            revert LSP8NotTokenOwner(tokenOwner, tokenId, msg.sender);
+        if (msg.sender != tokenOwner) {
+            if (operator != msg.sender) {
+                revert LSP8RevokeOperatorNotAuthorized(
+                    msg.sender,
+                    tokenOwner,
+                    tokenId
+                );
+            }
         }
 
         if (operator == address(0)) {
@@ -315,7 +321,7 @@ abstract contract LSP8IdentifiableDigitalAssetCore is
 
         if (notify) {
             bytes memory lsp1Data = abi.encode(
-                msg.sender,
+                tokenOwner,
                 tokenId,
                 false, // unauthorized
                 operatorNotificationData
@@ -625,10 +631,6 @@ abstract contract LSP8IdentifiableDigitalAssetCore is
         bool force,
         bytes memory data
     ) internal virtual {
-        if (from == to) {
-            revert LSP8CannotSendToSelf();
-        }
-
         address tokenOwner = tokenOwnerOf(tokenId);
         if (tokenOwner != from) {
             revert LSP8NotTokenOwner(tokenOwner, tokenId, from);

docs/_interface_ids_table.mdx

@@ -8,7 +8,7 @@
 | **LSP1UniversalReceiver**         | `0x6bb56a14` | Interface of the LSP1 - Universal Receiver standard, an entry function for a contract to receive arbitrary information.                                  |
 | **LSP1UniversalReceiverDelegate** | `0xa245bbda` | Interface of the LSP1 - Universal Receiver Delegate standard.                                                                                            |
 | **LSP6KeyManager**                | `0x23f34c62` | Interface of the LSP6 - Key Manager standard, a contract acting as a controller of an ERC725 Account using predfined permissions.                        |
-| **LSP7DigitalAsset**              | `0xb3c4928f` | Interface of the LSP7 - Digital Asset standard, a fungible digital asset.                                                                                |
+| **LSP7DigitalAsset**              | `0xc52d6008` | Interface of the LSP7 - Digital Asset standard, a fungible digital asset.                                                                                |
 | **LSP8IdentifiableDigitalAsset**  | `0x3a271706` | Interface of the LSP8 - Identifiable Digital Asset standard, a non-fungible digital asset.                                                               |
 | **LSP9Vault**                     | `0x28af17e6` | Interface of LSP9 - Vault standard, a blockchain vault that can hold assets and interact with other smart contracts.                                     |
 | **LSP11BasicSocialRecovery**      | `0x049a28f1` | Interface of the LSP11 - Basic Social Recovery standard, a contract to recover access control into an account.                                           |