feat: ensure backward compatibility with remoteEntry.js of snap v2.9.0

packages/starknet-snap/src/index.ts

@@ -60,6 +60,8 @@ import type {
   ApiParams,
   ApiParamsWithKeyDeriver,
   ApiRequestParams,
+  SendTransactionRequestParams,
+  SignTransactionRequestParams,
 } from './types/snapApi';
 import type { SnapState } from './types/snapState';
 import { upgradeAccContract } from './upgradeAccContract';
@@ -153,6 +155,26 @@ export const onRpcRequest: OnRpcRequestHandler = async ({ request }) => {
       saveMutex,
     };
 
+    // Ensuring backward compatibility with version 2.9.0 of the federated module.
+    // In version 2.9.0, the `starknet_sign*` methods used the `signerAddress` parameter.
+    // The current version expects `address`. This block checks if the old `signerAddress` is present
+    // and maps it to `address` to maintain compatibility with existing integrations.
+    const { signerAddress } =
+      apiParams.requestParams as SignTransactionRequestParams;
+    if (signerAddress) {
+      (apiParams.requestParams as any).address = signerAddress;
+      delete (apiParams.requestParams as any).signerAddress;
+    }
+
+    // In version 2.9.0, the `starknet_execute` and `starknet_declare` methods used the `senderAddress` parameter.
+    // Similarly, this block checks if `senderAddress` is present and maps it to `address` for backward compatibility.
+    const { senderAddress } =
+      apiParams.requestParams as SendTransactionRequestParams;
+    if (senderAddress) {
+      (apiParams.requestParams as any).address = senderAddress;
+      delete (apiParams.requestParams as any).senderAddress;
+    }
+
     switch (request.method) {
       case 'starkNet_createAccount':
         apiParams.keyDeriver = await getAddressKeyDeriver(snap);