feat(light-client): Restrict lightClientUpdate function

Author: Dimo99

beacon-light-client/solidity/contracts/bridge/src/interfaces/ILightClient.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.9;
+pragma solidity 0.8.20;
 
 interface ILightClient {
   struct LightClientUpdate {
@@ -32,5 +32,5 @@ interface ILightClient {
 
   function lightClientUpdate(
     LightClientUpdate calldata update
-  ) external payable;
+  ) external;
 }

beacon-light-client/solidity/contracts/bridge/src/truth/eth/BeaconLightClient.sol

@@ -1,12 +1,13 @@
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.9;
+pragma solidity 0.8.20;
 
 import '../../utils/LightClientUpdateVerifier.sol';
 import '../../interfaces/ILightClient.sol';
+import '@openzeppelin/contracts/access/Ownable.sol';
 
 uint256 constant BUFER_SIZE = 32;
 
-contract BeaconLightClient is LightClientUpdateVerifier, ILightClient {
+contract BeaconLightClient is Ownable, LightClientUpdateVerifier, ILightClient {
   bytes32[BUFER_SIZE] public optimisticHeaders;
 
   uint256[BUFER_SIZE] public optimisticSlots;
@@ -25,7 +26,7 @@ contract BeaconLightClient is LightClientUpdateVerifier, ILightClient {
     bytes32 _finalizedHeaderRoot,
     bytes32 _executionStateRoot,
     bytes32 _domain
-  ) {
+  ) Ownable(msg.sender) {
     currentIndex = 0;
 
     optimisticHeaders[currentIndex] = _optimisticHeaderRoot;
@@ -51,11 +52,9 @@ contract BeaconLightClient is LightClientUpdateVerifier, ILightClient {
     return executionStateRoots[currentIndex];
   }
 
-  // TODO: fix name to lightClientUpdate
-  function lightClientUpdate(LightClientUpdate calldata update)
-    external
-    payable
-  {
+  function lightClientUpdate(
+    LightClientUpdate calldata update
+  ) external onlyOwner {
     require(
       verifyUpdate(
         update.a,

beacon-light-client/solidity/contracts/bridge/src/utils/LightClientUpdateVerifier.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity 0.8.9;
+pragma solidity 0.8.20;
 
 import './Verifier.sol';