From 25c93068e0c42efca158a4c97e8b036f053ce48e Mon Sep 17 00:00:00 2001
From: Griko Nibras <griko@nibras.co>
Date: Wed, 31 Jan 2024 06:40:54 +0700
Subject: [PATCH] fix: prioritize mintscan explorer links [FRE-585]

---
 src/pages/api/explorer/[chainId].ts | 72 ++++++++++++++---------------
 1 file changed, 36 insertions(+), 36 deletions(-)

diff --git a/src/pages/api/explorer/[chainId].ts b/src/pages/api/explorer/[chainId].ts
index 2b95f0ad..a59a5928 100644
--- a/src/pages/api/explorer/[chainId].ts
+++ b/src/pages/api/explorer/[chainId].ts
@@ -3,50 +3,50 @@ import { NextRequest } from "next/server";
 
 import { explorersRecord } from "@/chains/explorers";
 import { ExplorerResponse } from "@/schemas/api";
+import { raise } from "@/utils/assert";
 
 export const config: PageConfig = {
   runtime: "edge",
 };
 
 export default async function handler(req: NextRequest) {
-  let baseUrl: string | undefined;
-  const chainId = req.nextUrl.searchParams.get("chainId") || "";
-
-  const parsedIntId = parseInt(chainId);
-  const isEvmChain = typeof parsedIntId === "number" && !isNaN(parsedIntId);
-
-  if (isEvmChain) {
-    const { EVM_CHAINS } = await import("@/constants/wagmi");
-    const chain = EVM_CHAINS.find((chain) => chain.id === parseInt(chainId));
-    if (chain?.blockExplorers?.default.url) {
-      baseUrl = chain.blockExplorers!.default.url;
+  try {
+    let baseUrl: string | undefined;
+    const chainId = req.nextUrl.searchParams.get("chainId") || raise("/api/explorer error: 'chainId' is required");
+
+    const parsedIntId = parseInt(chainId);
+    const isEvmChain = typeof parsedIntId === "number" && !isNaN(parsedIntId);
+
+    if (isEvmChain) {
+      const { EVM_CHAINS } = await import("@/constants/wagmi");
+      const chain = EVM_CHAINS.find((chain) => chain.id === parseInt(chainId));
+      if (chain?.blockExplorers?.default.url) {
+        baseUrl = chain.blockExplorers!.default.url;
+      }
+    } else {
+      const explorers = explorersRecord[chainId] || [];
+
+      baseUrl ||= explorers.find((explorer) => explorer.kind === "mintscan")?.tx_page;
+      baseUrl ||= explorers[0]?.tx_page;
     }
-  }
 
-  const explorers = explorersRecord[chainId] || [];
-
-  const mintscan = explorers.find((explorer) => explorer.kind === "mintscan");
-  if (mintscan && mintscan.tx_page) {
-    baseUrl = mintscan.tx_page;
-  }
-
-  if (explorers[0]?.tx_page) {
-    baseUrl = explorers[0].tx_page;
-  }
+    if (!baseUrl) {
+      return new Response(null, { status: 404 }); // Not Found
+    }
 
-  if (!baseUrl) {
-    return new Response(null, { status: 404 }); // Not Found
+    const payload: ExplorerResponse = {
+      evm: isEvmChain,
+      explorer: baseUrl,
+    };
+
+    return new Response(JSON.stringify(payload), {
+      headers: {
+        "cache-control": "public, max-age=604800, immutable", // 1 week
+        "content-type": "application/json",
+      },
+    });
+  } catch (error) {
+    console.error(error);
+    return new Response(null, { status: 500 }); // Internal Server Error
   }
-
-  const payload: ExplorerResponse = {
-    evm: isEvmChain,
-    explorer: baseUrl,
-  };
-
-  return new Response(JSON.stringify(payload), {
-    headers: {
-      "cache-control": "public, max-age=604800, immutable", // 1 week
-      "content-type": "application/json",
-    },
-  });
 }