Feature #1480: Handle rpc calls from apps SDK

package.json

@@ -163,7 +163,7 @@
     ]
   },
   "dependencies": {
-    "@gnosis.pm/safe-apps-sdk": "https://github.com/gnosis/safe-apps-sdk#a6c168b",
+    "@gnosis.pm/safe-apps-sdk": "https://github.com/gnosis/safe-apps-sdk.git#3f0689f",
     "@gnosis.pm/safe-contracts": "1.1.1-dev.2",
     "@gnosis.pm/safe-react-components": "https://github.com/gnosis/safe-react-components.git#70e57bdd1e0fd5dfdf5768076577c1e000b5fe28",
     "@gnosis.pm/util-contracts": "2.0.6",

src/routes/safe/components/Apps/hooks/useIframeMessageHandler.ts

@@ -19,6 +19,7 @@ import {
   safeNameSelector,
   safeParamAddressFromStateSelector,
 } from 'src/logic/safe/store/selectors'
+import { web3ReadOnly } from 'src/logic/wallets/getWeb3'
 import { SafeApp } from 'src/routes/safe/components/Apps/types.d'
 
 type InterfaceMessageProps<T extends InterfaceMessageIds> = {
@@ -38,10 +39,6 @@ interface CustomMessageEvent extends MessageEvent {
   }
 }
 
-interface InterfaceMessageRequest extends InterfaceMessageProps<InterfaceMessageIds> {
-  requestId: number | string
-}
-
 const NETWORK_NAME = getNetworkName()
 
 const useIframeMessageHandler = (
@@ -75,7 +72,7 @@ const useIframeMessageHandler = (
       messageId: SDKMessageIds,
       messagePayload: SDKMessageToPayload[typeof messageId],
       requestId: RequestId,
-    ) => {
+    ): void => {
       if (!messageId) {
         console.error('ThirdPartyApp: A message was received without message id.')
         return
@@ -104,6 +101,36 @@ const useIframeMessageHandler = (
           break
         }
 
+        case SDK_MESSAGES.RPC_CALL: {
+          const payload = messagePayload as SDKMessageToPayload['RPC_CALL']
+
+          if (
+            web3ReadOnly.currentProvider !== null &&
+            typeof web3ReadOnly.currentProvider !== 'string' &&
+            'send' in web3ReadOnly.currentProvider
+          ) {
+            web3ReadOnly.currentProvider?.send?.(
+              {
+                jsonrpc: '2.0',
+                method: payload?.call,
+                params: payload?.params,
+                id: '1',
+              },
+              (err, res) => {
+                if (!err) {
+                  const rpcCallMsg = {
+                    messageId: INTERFACE_MESSAGES.RPC_CALL_RESPONSE,
+                    data: res,
+                  }
+
+                  sendMessageToIframe(rpcCallMsg, requestId)
+                }
+              },
+            )
+          }
+          break
+        }
+
         case SDK_MESSAGES.SAFE_APP_SDK_INITIALIZED: {
           const safeInfoMessage = {
             messageId: INTERFACE_MESSAGES.ON_SAFE_INFO,