Add data fetching functionality to API

- Introduced a new `getData` function to fetch data from the API for a given connection ID.
- Added `DataResponse` interface to define the structure of the response from the `/data/{id}` endpoint.
- Updated `index.ts` to export the new `getData` function and `DataResponse` type for external use.

src/api.ts

@@ -1,11 +1,21 @@
 import type { 
     ServerMessage,
     ConnectResponseMessage,
-    SignTransactionResponseMessage 
+    SignTransactionResponseMessage, 
+    ClientRequest
 } from './socket';
 
 const API_URL = 'https://connect.varan.app';
 
+/**
+ * Response structure for GET /data/{id} endpoint
+ */
+export interface DataResponse {
+    id: string;
+    data: Array<ClientRequest>;
+    total: number;
+}
+
 /**
  * Sends a connect response message to the API
  * This will be received by the client's WebSocket and handled by the socket
@@ -63,3 +73,27 @@ async function sendServerMessage(
     }
 }
 
+/**
+ * Fetches data from the API for a given connection ID
+ * @param connectionId The unique connection ID from WebSocket
+ * @returns Promise resolving to the data response
+ */
+export async function getData(connectionId: string): Promise<DataResponse> {
+    try {
+        const response = await fetch(`${API_URL}/data/${connectionId}`);
+        
+        if (!response.ok) {
+            throw new Error(`HTTP error! status: ${response.status}`);
+        }
+
+        const data: DataResponse = await response.json();
+        return {
+            ...data,
+            data: data.data.filter(item => item.method === 'connect' || item.method === 'sT'),
+        }
+    } catch (error) {
+        console.error('[VARANINJECT] Error fetching data:', error);
+        throw error;
+    }
+}
+