store network info in cookies

.env.development

-API_HOST=blockscout.com
-API_BASE_PATH=/xdai/testnet/api
\ No newline at end of file

.env.production

-API_HOST=blockscout.com
-API_BASE_PATH=/xdai/testnet/api
\ No newline at end of file

lib/api/fetch.ts

@@ -9,7 +9,7 @@ export default function fetch(path: string, init?: RequestInit): Promise<Respons
     authorization: `Bearer ${ process.env.API_AUTHORIZATION_TOKEN }`,
     'content-type': 'application/json',
   };
-  const url = `https://${ process.env.API_HOST }${ process.env.API_BASE_PATH }${ path }`;
+  const url = `https://blockscout.com${ path }`;
 
   return nodeFetch(url, {
     headers,

lib/api/handler.ts

 import type { NextApiRequest, NextApiResponse } from 'next';
 
 import fetch from 'lib/api/fetch';
+import * as cookies from 'lib/cookies';
 
 type Methods = 'GET' | 'POST' | 'PUT' | 'DELETE';
 
@@ -8,7 +9,16 @@ export default function handler<TRes>(getUrl: (_req: NextApiRequest) => string,
   return async(_req: NextApiRequest, res: NextApiResponse<TRes>) => {
     if (_req.method && allowedMethods.includes(_req.method as Methods)) {
       const isBodyDisallowed = _req.method === 'GET' || _req.method === 'HEAD';
-      const response = await fetch(getUrl(_req), {
+      const networkType = _req.cookies[cookies.NAMES.NETWORK_TYPE];
+      const networkSubType = _req.cookies[cookies.NAMES.NETWORK_SUB_TYPE];
+
+      if (!networkType || !networkSubType) {
+        // eslint-disable-next-line no-console
+        console.error(`Incorrect network: NETWORK_TYPE=${ networkType } NETWORK_SUB_TYPE=${ networkSubType }`);
+      }
+
+      const url = `/${ networkType }/${ networkSubType }/api${ getUrl(_req) }`;
+      const response = await fetch(url, {
         method: _req.method,
         body: isBodyDisallowed ? undefined : _req.body,
       });

lib/cookies.ts

@@ -4,7 +4,9 @@ import { Cookies } from 'typescript-cookie';
 import isBrowser from './isBrowser';
 
 export enum NAMES {
-  NAV_BAR_COLLAPSED='nav_bar_collapsed'
+  NAV_BAR_COLLAPSED='nav_bar_collapsed',
+  NETWORK_TYPE='network_type',
+  NETWORK_SUB_TYPE='network_sub_type',
 }
 
 export function get(name?: string | undefined | null) {

next.config.js

@@ -11,7 +11,7 @@ module.exports = withReactSvg({
     return [
       {
         source: '/',
-        destination: '/xdai/mainnet',
+        destination: '/xdai/testnet',
         permanent: true,
       },
     ];

ui/navigation/networkMenu/NetworkMenu.tsx

 import { Popover, PopoverTrigger, Icon, useColorModeValue, Button } from '@chakra-ui/react';
+import { useRouter } from 'next/router';
 import React from 'react';
 
 import networksIcon from 'icons/networks.svg';
+import * as cookies from 'lib/cookies';
 import getDefaultTransitionProps from 'theme/utils/getDefaultTransitionProps';
 
 import NetworkMenuPopup from './NetworkMenuPopup';
@@ -11,6 +13,19 @@ interface Props {
 }
 
 const NetworkMenu = ({ isCollapsed }: Props) => {
+  const router = useRouter();
+  const networkType = router.query.network_type;
+  const networkSubType = router.query.network_sub_type;
+
+  React.useEffect(() => {
+    if (typeof networkType === 'string') {
+      cookies.set(cookies.NAMES.NETWORK_TYPE, networkType);
+    }
+    if (typeof networkSubType === 'string') {
+      cookies.set(cookies.NAMES.NETWORK_SUB_TYPE, networkSubType);
+    }
+  }, [ networkType, networkSubType ]);
+
   return (
     <Popover openDelay={ 300 } placement="right-start" gutter={ 22 } isLazy>
       <PopoverTrigger>

ui/navigation/networkMenu/NetworkMenuLink.tsx

@@ -32,7 +32,7 @@ const NetworkMenuLink = ({ name, type, subType, icon, isActive, routeName, isAcc
   const pathName = `/${ type }/${ subType }${ localPath }`;
 
   // will fix later after we agree on CI/CD workflow
-  const href = type === 'xdai' ? pathName : 'https://blockscout.com' + pathName;
+  const href = type === 'xdai' && subType === 'testnet' ? pathName : 'https://blockscout.com' + pathName;
   const hasIcon = Boolean(icon);
   const colors = useColors({ hasIcon });