Function middleware

Example

import { middleware } from 'kitojs';

// Basic middleware
const logger = middleware((ctx, next) => {
  console.log(`${ctx.req.method} ${ctx.req.url}`);
  next();
});

// Authentication middleware
const auth = middleware((ctx, next) => {
  const token = ctx.req.headers.authorization;

  if (!token || !verifyToken(token)) {
    ctx.res.status(401).send('Unauthorized');
    return;
  }

  next();
});

// Async middleware
const asyncAuth = middleware(async (ctx, next) => {
  const user = await validateUser(ctx.req.headers.authorization);
  if (!user) {
    ctx.res.status(401).send('Unauthorized');
    return;
  }
  await next();
});

// Using middleware
app.use(logger); // global

// Route middleware
app.get('/protected', [auth], ctx => {
  ctx.res.send('Secret data');
});
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