feat(token-handler)!: give interchain token mint/burn permission to token manager

.changeset/many-tigers-kneel.md

@@ -0,0 +1,5 @@
+---
+'@axelar-network/interchain-token-service': minor
+---
+
+Interchain tokens now get minted/burnt by the token manager.

contracts/TokenHandler.sol

@@ -43,7 +43,7 @@ contract TokenHandler is ITokenHandler, ITokenManagerType, ReentrancyGuard, Crea
             tokenManagerType == uint256(TokenManagerType.MINT_BURN) ||
             tokenManagerType == uint256(TokenManagerType.MINT_BURN_FROM)
         ) {
-            _mintToken(tokenManager, tokenAddress, to, amount);
+            _mintToken(ITokenManager(tokenManager), tokenAddress, to, amount);
             return (amount, tokenAddress);
         }
 
@@ -78,7 +78,7 @@ contract TokenHandler is ITokenHandler, ITokenManagerType, ReentrancyGuard, Crea
         if (
             tokenManagerType == uint256(TokenManagerType.NATIVE_INTERCHAIN_TOKEN) || tokenManagerType == uint256(TokenManagerType.MINT_BURN)
         ) {
-            _burnToken(tokenManager, tokenAddress, from, amount);
+            _burnToken(ITokenManager(tokenManager), tokenAddress, from, amount);
         } else if (tokenManagerType == uint256(TokenManagerType.MINT_BURN_FROM)) {
             _burnTokenFrom(tokenAddress, from, amount);
         } else if (tokenManagerType == uint256(TokenManagerType.LOCK_UNLOCK)) {
@@ -132,12 +132,16 @@ contract TokenHandler is ITokenHandler, ITokenManagerType, ReentrancyGuard, Crea
      * @param tokenManager The address of the token manager.
      */
     // slither-disable-next-line locked-ether
-    function postTokenManagerDeploy(uint256 tokenManagerType, address tokenManager) external payable {
-        // For lock/unlock token managers, the ITS contract needs an approval from the token manager to transfer tokens on its behalf
-        if (tokenManagerType == uint256(TokenManagerType.LOCK_UNLOCK) || tokenManagerType == uint256(TokenManagerType.LOCK_UNLOCK_FEE)) {
-            ITokenManager(tokenManager).approveService();
-        } else if (tokenManagerType == uint256(TokenManagerType.NATIVE_INTERCHAIN_TOKEN)) {
-            IMinter(ITokenManager(tokenManager).tokenAddress()).transferMintership(tokenManager);
+    function postTokenManagerDeploy(uint256 tokenManagerType, ITokenManager tokenManager) external payable {
+        // For native interhcain tokens we transfer mintership to the token manager.
+        // This is done here because InterchainToken bytecode needs to be fixed.
+        if (tokenManagerType == uint256(TokenManagerType.NATIVE_INTERCHAIN_TOKEN)) {
+            IMinter(tokenManager.tokenAddress()).transferMintership(address(tokenManager));
+            // For lock/unlock token managers, the ITS contract needs an approval from the token manager to transfer tokens on its behalf.
+        } else if (
+            tokenManagerType == uint256(TokenManagerType.LOCK_UNLOCK) || tokenManagerType == uint256(TokenManagerType.LOCK_UNLOCK_FEE)
+        ) {
+            tokenManager.approveService();
         }
     }
 
@@ -161,12 +165,12 @@ contract TokenHandler is ITokenHandler, ITokenManagerType, ReentrancyGuard, Crea
         return diff < amount ? diff : amount;
     }
 
-    function _mintToken(address tokenManager, address tokenAddress, address to, uint256 amount) internal {
-        ITokenManager(tokenManager).mintToken(tokenAddress, to, amount);
+    function _mintToken(ITokenManager tokenManager, address tokenAddress, address to, uint256 amount) internal {
+        tokenManager.mintToken(tokenAddress, to, amount);
     }
 
-    function _burnToken(address tokenManager, address tokenAddress, address from, uint256 amount) internal {
-        ITokenManager(tokenManager).burnToken(tokenAddress, from, amount);
+    function _burnToken(ITokenManager tokenManager, address tokenAddress, address from, uint256 amount) internal {
+        tokenManager.burnToken(tokenAddress, from, amount);
     }
 
     function _burnTokenFrom(address tokenAddress, address from, uint256 amount) internal {

contracts/interfaces/ITokenHandler.sol

@@ -2,6 +2,8 @@
 
 pragma solidity ^0.8.0;
 
+import { ITokenManager } from './ITokenManager.sol';
+
 /**
  * @title ITokenHandler Interface
  * @notice This interface is responsible for handling tokens before initiating an interchain token transfer, or after receiving one.
@@ -47,5 +49,5 @@ interface ITokenHandler {
      * @param tokenManagerType The token manager type.
      * @param tokenManager The address of the token manager.
      */
-    function postTokenManagerDeploy(uint256 tokenManagerType, address tokenManager) external payable;
+    function postTokenManagerDeploy(uint256 tokenManagerType, ITokenManager tokenManager) external payable;
 }