From 81f14dc0b6001f221a3a824f8c689a9d492e7c55 Mon Sep 17 00:00:00 2001
From: Willian Mitsuda <wmitsuda@gmail.com>
Date: Thu, 15 Jul 2021 02:40:11 -0300
Subject: [PATCH] Add API level check

---
 src/ConnectionErrorPanel.tsx |  6 +++---
 src/params.ts                |  2 ++
 src/useProvider.ts           | 15 +++++++++------
 3 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/src/ConnectionErrorPanel.tsx b/src/ConnectionErrorPanel.tsx
index c03ce84..47b1584 100644
--- a/src/ConnectionErrorPanel.tsx
+++ b/src/ConnectionErrorPanel.tsx
@@ -66,10 +66,10 @@ const ConnectionErrorPanel: React.FC<ConnectionErrorPanelProps> = ({
             <Step type="ok" msg="It is an Erigon node" />
             <Step
               type="error"
-              msg="It does not seem to contain Otterscan patches"
+              msg="It does not seem to contain up-to-date Otterscan patches"
             >
-              Make sure you compiled rpcdaemon with Otterscan patches and
-              enabled <strong>ots_</strong> namespace according to the{" "}
+              Make sure you compiled rpcdaemon with compatible Otterscan patches
+              and enabled <strong>ots_</strong> namespace according to the{" "}
               <a
                 href="https://github.com/wmitsuda/otterscan#install-otterscan-patches-on-top-of-erigon"
                 target="_blank"
diff --git a/src/params.ts b/src/params.ts
index 45d559e..75d31c3 100644
--- a/src/params.ts
+++ b/src/params.ts
@@ -1 +1,3 @@
+export const MIN_API_LEVEL = 1;
+
 export const PAGE_SIZE = 25;
diff --git a/src/useProvider.ts b/src/useProvider.ts
index b8eed30..9ce1445 100644
--- a/src/useProvider.ts
+++ b/src/useProvider.ts
@@ -1,6 +1,7 @@
 import { useEffect, useState } from "react";
 import { ethers } from "ethers";
 import { ConnectionStatus } from "./types";
+import { MIN_API_LEVEL } from "./params";
 
 export const DEFAULT_ERIGON_URL = "http://127.0.0.1:8545";
 
@@ -60,12 +61,14 @@ export const useProvider = (
 
       // Check if it has Otterscan patches by probing a lightweight method
       try {
-        // TODO: replace by a custom made method that works in all networks
-        await provider.send("ots_getTransactionTransfers", [
-          "0x793e079fbc427cba0857b4e878194ab508f33983f45415e50af3c3c0e662fdf3",
-        ]);
-        setConnStatus(ConnectionStatus.CONNECTED);
-        setProvider(provider);
+        const level = await provider.send("ots_getApiLevel", []);
+        if (level < MIN_API_LEVEL) {
+          setConnStatus(ConnectionStatus.NOT_OTTERSCAN_PATCHED);
+          setProvider(undefined);
+        } else {
+          setConnStatus(ConnectionStatus.CONNECTED);
+          setProvider(provider);
+        }
       } catch (err) {
         console.log(err);
         setConnStatus(ConnectionStatus.NOT_OTTERSCAN_PATCHED);