special handling for token 1

contracts/CurioERC1155Wrapper.sol

@@ -6,13 +6,14 @@ import "./IMastersFedi.sol";
 import "./Address.sol";
 import "./IERC1155Metadata.sol";
 import "./ERC1155Metadata.sol";
+import "./IERC223ReceivingContract.sol";
 import "@openzeppelin/contracts/utils/Strings.sol"; 
 import "@openzeppelin/contracts/utils/Base64.sol"; 
 import "@openzeppelin/contracts/access/Ownable.sol";
 import "@openzeppelin/contracts/security/Pausable.sol";
 import "@openzeppelin/contracts/token/common/ERC2981.sol";
 
-contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, ERC2981, Ownable, Pausable {
+contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, ERC2981, IERC223ReceivingContract, Ownable, Pausable {
     using Address for address;
 
     mapping (uint256 => address) public contracts;
@@ -139,6 +140,24 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, E
         destroyable = false;
     }
 
+    /**
+        @dev called by token 1 contract after transfer, this is the only method to wrap 1.
+     */
+    function tokenFallback(address _from, uint256 _value, bytes memory) override external {
+        require(_from == owner(), "Only owner can wrap token 1");
+        require(msg.sender == contracts[1] , "Can only transfer from token 1 owner");
+        IMastersFedi curio = IMastersFedi(contracts[1]);
+        require (curio.balanceOf(address(this)) <= 450, "Sanity transfer exceeded");
+        // no balance check is done because an overflow would fail the sanity check anyway
+
+        balances[1][_from] += _value;
+
+        // mint
+        emit TransferSingle(msg.sender, address(0), _from, 1, _value);
+
+        // safe transfer acceptance check not necessary because locked to a known contract
+    }
+
     /**
         @notice Converts old-style NFT to new-style
         @dev For an NFT ID, queries and transfers tokens from the appropriate
@@ -150,6 +169,7 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, E
     function wrap(uint256 _id, uint256 _quantity) external whenNotPaused {
         address tokenContract = contracts[_id];
         require(tokenContract != address(0), "invalid id");
+        require(_id != 1, "cannot wrap token 1 this way");
         IMastersFedi curio = IMastersFedi(tokenContract);
 
         // these are here for convenience because curio contract doesn't throw meaningful exceptions
@@ -186,6 +206,7 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, E
 
             address tokenContract = contracts[_id];
             require(tokenContract != address(0), "invalid id");
+            require(_id != 1, "cannot wrap token 1 this way");
             IMastersFedi curio = IMastersFedi(tokenContract);
 
             require(curio.balanceOf(msg.sender) >= _quantity, "insufficient curio balance");
@@ -214,6 +235,7 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, E
     function unwrap(uint256 _id, uint256 _quantity) external whenNotPaused {
         address tokenContract = contracts[_id];
         require(tokenContract != address(0), "invalid id");
+        require(_id != 1, "token 1 cannot be unwrapped");
         IMastersFedi curio = IMastersFedi(tokenContract);
 
         require(balances[_id][msg.sender] >= _quantity, "insufficient balance");
@@ -241,6 +263,7 @@ contract CurioERC1155Wrapper is ERC1155, ERC1155Metadata_URI, ERC1155Metadata, E
 
             address tokenContract = contracts[_id];
             require(tokenContract != address(0), "invalid id");
+            require(_id != 1, "token 1 cannot be unwrapped");
             IMastersFedi curio = IMastersFedi(tokenContract);
 
             require(balances[_id][msg.sender] >= _quantity, "insufficient balance");

contracts/IERC223ReceivingContract.sol

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma solidity ^0.8.17;
+
+interface IERC223ReceivingContract {
+    function tokenFallback(address _from, uint256 _value, bytes memory _data) external;
+}