Added logic

packages/beacon-node/src/api/impl/builder/index.ts

@@ -1,23 +1,34 @@
 import {routes, ServerApi} from "@lodestar/api";
 import {Slot} from "@lodestar/types";
+import {getExpectedWithdrawals} from "@lodestar/state-transition";
+import {CachedBeaconStateCapella} from "@lodestar/state-transition/src/types.js";
+import {ExpectedWithdrawals} from "@lodestar/api/src/beacon/routes/builder.js";
 import {ApiModules} from "../types.js";
+import {resolveStateId} from "../beacon/state/utils.js";
 
-export function getBuilderApi({chain, config}: Pick<ApiModules, "chain" | "config">): ServerApi<routes.builder.Api> {
+export function getBuilderApi({chain}: Pick<ApiModules, "chain" | "config">): ServerApi<routes.builder.Api> {
   return {
     async getExpectedWithdrawals(stateId: routes.beacon.StateId, proposalSlot?: Slot | undefined) {
+      const {state, executionOptimistic} = await resolveStateId(chain, stateId, {allowRegen: true});
+      const expectedWithdrawals = getExpectedWithdrawals(state as CachedBeaconStateCapella).withdrawals;
       // eslint-disable-next-line no-console
-      console.log(chain, config, stateId, proposalSlot);
+      console.log("Prolosal Slot", proposalSlot, "State data", state, "expectedWithdrawlsData", expectedWithdrawals);
       return {
-        executionOptimistic: false,
-        data: [
-          {
-            index: 1,
-            validatorIndex: 1,
-            address: "0xAbcF8e0d4e9587369b2301D0790347320302cc09",
-            amount: 1,
-          },
-        ],
+        executionOptimistic: executionOptimistic,
+        data: expectedWithdrawals.map((item: {address: Uint8Array}) => ({
+          ...item,
+          address: Buffer.from(item.address).toString("hex"), // Convert Uint8Array to hexadecimal string
+        })) as ExpectedWithdrawals[],
       };
     },
   };
 }
+
+// data: [
+//   {
+//     index: 1,
+//     validatorIndex: 1,
+//     address: "0xAbcF8e0d4e9587369b2301D0790347320302cc09",
+//     amount: 1,
+//   },
+// ],