How to use grant-koa - 2 common examples

import usePostJson from './json/post_json';
import isBot from 'koa-isbot';
import session from '@steem/crypto-session';
import csrf from 'koa-csrf';
import flash from 'koa-flash';
import minimist from 'minimist';
import Grant from 'grant-koa';
import config from 'config';
import { routeRegex } from 'app/ResolveRoute';
import secureRandom from 'secure-random';
import userIllegalContent from 'app/utils/userIllegalContent';

if(cluster.isMaster)
    console.log('application server starting, please wait.');

const grant = new Grant(config.grant);
// import uploadImage from 'server/upload-image' //medium-editor

const app = new Koa();
app.name = 'Steemit app';
const env = process.env.NODE_ENV || 'development';
// cache of a thousand days
const cacheOpts = { maxAge: 86400000, gzip: true };

// set number of processes equal to number of cores
// (unless passed in as an env var)
const numProcesses = process.env.NUM_PROCESSES || os.cpus().length;

app.use(requestTime());

app.keys = [config.get('session_key')];

import favicon from 'koa-favicon';
import staticCache from 'koa-static-cache';
import useRedirects from './redirects';
// import useOauthLogin from './api/oauth';
// import useGeneralApi from './api/general';
// import useAccountRecoveryApi from './api/account_recovery';
// import useEnterAndConfirmEmailPages from './server_pages/enter_confirm_email';
import isBot from 'koa-isbot';
import session from 'koa-session';
import csrf from 'koa-csrf';
import flash from 'koa-flash';
import minimist from 'minimist';
import Grant from 'grant-koa';
import config from '../config';

const grant = new Grant(config.grant);
// import uploadImage from 'server/upload-image' //medium-editor

const app = new Koa();
app.name = 'Steemit app';
const env = process.env.NODE_ENV || 'development';
const cacheOpts = {maxAge: 86400000, gzip: true};

app.keys = [config.session_key];
app.use(session({maxAge: 1000 * 3600 * 24 * 7}, app));
csrf(app);
app.use(mount(grant));
app.use(flash({key: 'flash'}));

// redirect to home page if known account
// remember ch, cn, r url params in the session and remove them from url
app.use(function *(next) {