Support evm chains in /chains api

pages/api/chains.ts

@@ -28,16 +28,40 @@ export default async function (
     });
   });
 
-  const jsonDirectory = path.join(process.cwd(), "cosmos");
-
-  const fetchChains = (await fs.readdir(jsonDirectory)).map((fileName) =>
-    fs.readFile(`${jsonDirectory}/${fileName}`, "utf8"),
+  const cosmosChainsDirectory = path.join(process.cwd(), "cosmos");
+  const cosmosChains = (await fs.readdir(cosmosChainsDirectory)).map(
+    (fileName) => fs.readFile(`${cosmosChainsDirectory}/${fileName}`, "utf8"),
   );
-
-  const chainInfos: ChainInfo[] = (await Promise.all(fetchChains)).map(
+  const cosmosChainInfos: ChainInfo[] = (await Promise.all(cosmosChains)).map(
     (chainInfo) => JSON.parse(chainInfo),
   );
 
-  //Return the content of the data file in json format
-  res.status(200).json({ chains: chainInfos });
+  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 ?? []),
+      };
+    },
+  );
+
+  // Return the content of the data file in json format
+  res.status(200).json({ chains: cosmosChainInfos.concat(evmChainInfos) });
 }