feat: implemented 02-client

src/ICS02Client.sol

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.25;
+
+import { IICS02Client } from "./interfaces/IICS02Client.sol";
+import { Strings } from "@openzeppelin/contracts/utils/Strings.sol";
+import { IBCIdentifiers } from "./utils/IBCIdentifiers.sol";
+import { ILightClient } from "./interfaces/ILightClient.sol";
+import { IICS02ClientErrors } from "./errors/IICS02ClientErrors.sol";
+
+contract ICS02Client is IICS02Client, IICS02ClientErrors {
+    /// @dev clientId => counterpartyInfo
+    mapping(string => CounterpartyInfo) private counterpartyInfos;
+    /// @dev clientId => client
+    mapping(string => ILightClient) private clients;
+    /// @dev clientType => nextClientSeq
+    mapping(string => uint32) private nextClientSeq;
+
+    /// @notice Generates the next client identifier
+    /// @param clientType The client type
+    /// @return The next client identifier
+    function getNextClientId(string calldata clientType) private returns (string memory) {
+        if (!IBCIdentifiers.validateClientType(clientType)) {
+            revert IBCInvalidClientType(clientType);
+        }
+
+        uint32 seq = nextClientSeq[clientType];
+        nextClientSeq[clientType] = seq + 1;
+        return string.concat(clientType, "-", Strings.toString(seq));
+    }
+
+    function getCounterparty(string calldata clientId) external view returns (CounterpartyInfo memory) {
+        return counterpartyInfos[clientId];
+    }
+
+    function getClient(string calldata clientId) external view returns (ILightClient) {
+        return clients[clientId];
+    }
+
+    function addClient(string calldata clientType, CounterpartyInfo calldata counterpartyInfo, address client) external returns (string memory) {
+        string memory clientId = getNextClientId(clientType);
+        clients[clientId] = ILightClient(client);
+        counterpartyInfos[clientId] = counterpartyInfo;
+        return clientId;
+    }
+
+    function updateClient(string calldata clientId, bytes calldata updateMsg) external returns (ILightClient.UpdateResult) {
+        return clients[clientId].updateClient(updateMsg);
+    }
+
+    function submitMisbehaviour(string calldata clientId, bytes calldata misbehaviourMsg) external {
+        clients[clientId].misbehaviour(misbehaviourMsg);
+    }
+}

src/ICS26Router.sol

@@ -12,6 +12,8 @@ import { IBCIdentifiers } from "./utils/IBCIdentifiers.sol";
 import { IIBCAppCallbacks } from "./msgs/IIBCAppCallbacks.sol";
 import { ICS24Host } from "./utils/ICS24Host.sol";
 
+/// @title IBC Eureka Router
+/// @notice ICS26Router is the router for the IBC Eureka protocol
 contract ICS26Router is IICS26Router, IBCStore, Ownable, IICS26RouterErrors {
     mapping(string => IIBCApp) private apps;
     IICS02Client private ics02Client;

src/errors/IICS02ClientErrors.sol

@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity >=0.8.25;
+
+interface IICS02ClientErrors {
+    /// @param clientType client type
+    error IBCInvalidClientType(string clientType);
+}

src/interfaces/IICS02Client.sol

@@ -12,32 +12,23 @@ interface IICS02Client is IICS02ClientMsgs {
     /// @return The counterparty client information
     function getCounterparty(string calldata clientId) external view returns (CounterpartyInfo memory);
 
-    /// @notice Returns the creator of the client given the client identifier.
-    /// @param clientId The client identifier
-    /// @return The address of the client creator
-    function getCreator(string calldata clientId) external view returns (address);
-
     /// @notice Returns the address of the client contract given the client identifier.
     /// @param clientId The client identifier
     /// @return The address of the client contract
     function getClient(string calldata clientId) external view returns (ILightClient);
 
     /// @notice Adds a client to the client router.
     /// @param clientType The client type, e.g., "07-tendermint".
+    /// @param counterpartyInfo The counterparty client information
     /// @param client The address of the client contract
     /// @return The client identifier
-    function addClient(string calldata clientType, address client) external returns (string memory);
-
-    /// @notice Adds a counterparty to the client router.
-    /// @param clientId The client identifier
-    /// @param counterpartyInfo The counterparty client information
-    function addCounterparty(string calldata clientId, CounterpartyInfo calldata counterpartyInfo) external;
+    function addClient(string calldata clientType, CounterpartyInfo calldata counterpartyInfo, address client) external returns (string memory);
 
     /// @notice Updates the client given the client identifier.
     /// @param clientId The client identifier
     /// @param updateMsg The update message
     /// @return The result of the update operation
-    function routeUpdateClient(
+    function updateClient(
         string calldata clientId,
         bytes calldata updateMsg
     )
@@ -47,5 +38,5 @@ interface IICS02Client is IICS02ClientMsgs {
     /// @notice Submits misbehaviour to the client with the given client identifier.
     /// @param clientId The client identifier
     /// @param misbehaviourMsg The misbehaviour message
-    function routeMisbehaviour(string calldata clientId, bytes calldata misbehaviourMsg) external;
+    function submitMisbehaviour(string calldata clientId, bytes calldata misbehaviourMsg) external;
 }

src/utils/IBCIdentifiers.sol

@@ -42,4 +42,12 @@ library IBCIdentifiers {
         }
         return true;
     }
+
+    /// @notice validateClientType checks if the client type is allowed
+    function validateClientType(string memory clientType) internal pure returns (bool) {
+        if (keccak256(bytes(clientType)) == keccak256("07-tendermint")) {
+            return true;
+        }
+        return false;
+    }
 }