Merge pull request #1427 from chainapsis/retto/add-all-chains-evm

Add API route for fetching native and EVM chains

Author: blacktoast

pages/api/native-chains-with-evm.ts

@@ -0,0 +1,86 @@
+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import type { NextApiRequest, NextApiResponse } from "next";
+
+import path from "path";
+import { promises as fs } from "fs";
+import { ChainInfo } from "@keplr-wallet/types";
+import Cors from "cors";
+import {
+  nativeMainnetChainIdentifiers,
+  nativeTestnetChainIdentifiers,
+} from "../../src/constants";
+import { ChainIdHelper } from "@keplr-wallet/cosmos";
+
+type Data = {
+  mainnetChains: ChainInfo[];
+  testnetChains: ChainInfo[];
+};
+
+const cors = Cors({
+  methods: ["GET"],
+});
+
+export default async function (
+  req: NextApiRequest,
+  res: NextApiResponse<Data>,
+) {
+  await new Promise((resolve, reject) => {
+    cors(req, res, (result: any) => {
+      if (result instanceof Error) {
+        return reject(result);
+      }
+
+      return resolve(result);
+    });
+  });
+
+  const cosmosChainsDirectory = path.join(process.cwd(), "cosmos");
+  const cosmosChains = (await fs.readdir(cosmosChainsDirectory)).map(
+    (fileName) => fs.readFile(`${cosmosChainsDirectory}/${fileName}`, "utf8"),
+  );
+  const cosmosChainInfos: ChainInfo[] = (await Promise.all(cosmosChains)).map(
+    (chainInfo) => JSON.parse(chainInfo),
+  );
+
+  const evmChainsDirectory = path.join(process.cwd(), "evm");
+  const evmChains = await Promise.all(
+    (
+      await fs.readdir(evmChainsDirectory)
+    ).map((fileName) =>
+      fs.readFile(`${evmChainsDirectory}/${fileName}`, "utf8"),
+    ),
+  );
+  const evmChainInfos: ChainInfo[] = (await Promise.all(evmChains)).map(
+    (chainInfo) => {
+      const evmChainInfo = JSON.parse(chainInfo);
+      const evmChainId = parseInt(evmChainInfo.chainId.replace("eip155:", ""));
+      const { websocket, features, ...restEVMChainInfo } = evmChainInfo;
+      return {
+        ...restEVMChainInfo,
+        rest: evmChainInfo.rpc,
+        evm: {
+          chainId: evmChainId,
+          rpc: evmChainInfo.rpc,
+          websocket,
+        },
+        features: ["eth-address-gen", "eth-key-sign"].concat(features ?? []),
+      };
+    },
+  );
+
+  const allChainInfos = cosmosChainInfos.concat(evmChainInfos);
+
+  //Return the content of the data file in json format
+  res.status(200).json({
+    mainnetChains: allChainInfos.filter((chainInfo) =>
+      nativeMainnetChainIdentifiers.includes(
+        ChainIdHelper.parse(chainInfo.chainId).identifier,
+      ),
+    ),
+    testnetChains: allChainInfos.filter((chainInfo) =>
+      nativeTestnetChainIdentifiers.includes(
+        ChainIdHelper.parse(chainInfo.chainId).identifier,
+      ),
+    ),
+  });
+}