Custom errors, etc (#619)

* custom error for extensions

* contract publisher

* legacy contracts

* custom error for CurrencyTransferLib

* efficient hash function MerkleProof

* Pack without forwarder

* fix test

* fix tests

* fix btt tests

* extension tests

* extension tests

* test pack

* more btt

* more tests

* drop prebuilt tests

* fix lint

Author: kumaryash90

contracts/extension/BatchMintMetadata.sol

@@ -11,6 +11,15 @@ pragma solidity ^0.8.0;
  */
 
 contract BatchMintMetadata {
+    /// @dev Invalid index for batch
+    error BatchMintInvalidBatchId(uint256 index);
+
+    /// @dev Invalid token
+    error BatchMintInvalidTokenId(uint256 tokenId);
+
+    /// @dev Metadata frozen
+    error BatchMintMetadataFrozen(uint256 batchId);
+
     /// @dev Largest tokenId of each batch of tokens with the same baseURI + 1 {ex: batchId 100 at position 0 includes tokens 0-99}
     uint256[] private batchIds;
 
@@ -46,7 +55,7 @@ contract BatchMintMetadata {
      */
     function getBatchIdAtIndex(uint256 _index) public view returns (uint256) {
         if (_index >= getBaseURICount()) {
-            revert("Invalid index");
+            revert BatchMintInvalidBatchId(_index);
         }
         return batchIds[_index];
     }
@@ -65,7 +74,7 @@ contract BatchMintMetadata {
             }
         }
 
-        revert("Invalid tokenId");
+        revert BatchMintInvalidTokenId(_tokenId);
     }
 
     /// @dev Returns the baseURI for a token. The intended metadata URI for the token is baseURI + tokenId.
@@ -78,7 +87,8 @@ contract BatchMintMetadata {
                 return baseURI[indices[i]];
             }
         }
-        revert("Invalid tokenId");
+
+        revert BatchMintInvalidTokenId(_tokenId);
     }
 
     /// @dev returns the starting tokenId of a given batchId.
@@ -94,20 +104,25 @@ contract BatchMintMetadata {
                 return 0;
             }
         }
-        revert("Invalid batchId");
+
+        revert BatchMintInvalidBatchId(_batchID);
     }
 
     /// @dev Sets the base URI for the batch of tokens with the given batchId.
     function _setBaseURI(uint256 _batchId, string memory _baseURI) internal {
-        require(!batchFrozen[_batchId], "Batch frozen");
+        if (batchFrozen[_batchId]) {
+            revert BatchMintMetadataFrozen(_batchId);
+        }
         baseURI[_batchId] = _baseURI;
         emit BatchMetadataUpdate(_getBatchStartId(_batchId), _batchId);
     }
 
     /// @dev Freezes the base URI for the batch of tokens with the given batchId.
     function _freezeBaseURI(uint256 _batchId) internal {
         string memory baseURIForBatch = baseURI[_batchId];
-        require(bytes(baseURIForBatch).length > 0, "Invalid batch");
+        if (bytes(baseURIForBatch).length == 0) {
+            revert BatchMintInvalidBatchId(_batchId);
+        }
         batchFrozen[_batchId] = true;
         emit MetadataFrozen();
     }

contracts/extension/ContractMetadata.sol

@@ -13,6 +13,9 @@ import "./interface/IContractMetadata.sol";
  */
 
 abstract contract ContractMetadata is IContractMetadata {
+    /// @dev The sender is not authorized to perform the action
+    error ContractMetadataUnauthorized();
+
     /// @notice Returns the contract metadata URI.
     string public override contractURI;
 
@@ -26,7 +29,7 @@ abstract contract ContractMetadata is IContractMetadata {
      */
     function setContractURI(string memory _uri) external override {
         if (!_canSetContractURI()) {
-            revert("Not authorized");
+            revert ContractMetadataUnauthorized();
         }
 
         _setupContractURI(_uri);