From 0eafef49dc1dbf72c405683156b94a8b109c8d87 Mon Sep 17 00:00:00 2001
From: varshith264 <67782495+varshith264@users.noreply.github.com>
Date: Sat, 5 Oct 2024 11:34:10 +0530
Subject: [PATCH] add utility to compute appHashId using SHA256 of clientId and
 secretKey

---
 sample/App.java | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/sample/App.java b/sample/App.java
index 6d6c8ea..2678b3a 100644
--- a/sample/App.java
+++ b/sample/App.java
@@ -25,7 +25,7 @@ public class App implements FyersSocketDelegate {
     public static void main(String[] args) {
         String clientID = "";
         String secretKey = "";
-        String appHashId = "";
+        String appHashId = getSHA256Hash(clientID, secretKey);
 
         String redirectURI = "https://trade.fyers.in/api-login/redirect-uri/index.html";
         String code = "";
@@ -458,6 +458,25 @@ public void GetOptionChain(FyersClass fyersClass) {
 
     }
 
+    public String getSHA256Hash(String clientId, String secretKey) {
+        String input = String.format("%s:%s", clientId, secretKey);
+        try {
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+            byte[] encodedhash = digest.digest(input.getBytes());
+            StringBuilder hexString = new StringBuilder();
+            for (byte b : encodedhash) {
+                String hex = Integer.toHexString(0xff & b);
+                if (hex.length() == 1) {
+                    hexString.append('0');
+                }
+                hexString.append(hex);
+            }
+            return hexString.toString();
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
     public void WebSocket() {
         //Order Socket
         List<String> list = new ArrayList<>();
@@ -572,4 +591,4 @@ public void OnMessage(JSONObject message) {
         System.out.println("OnMessage: " + message);
     }
 
-}
\ No newline at end of file
+}