Koa adapter

import Koa from 'koa'
import Router from '@koa/router'
import bodyParser from 'koa-bodyparser'
import {
  authKoaProviderBegin,
  authKoaSession,
  authKoaSignIn,
  authKoaSignOut,
} from '@gentleduck/auth/server/koa'
import { auth } from './lib/auth'

const app = new Koa()
const router = new Router()

app.use(bodyParser())

router.post('/auth/signin', authKoaSignIn(auth))
router.post('/auth/signout', authKoaSignOut(auth))
router.get('/auth/session', authKoaSession(auth))
router.post('/auth/providers/:providerId/begin', (ctx) =>
  authKoaProviderBegin(auth, ctx.params.providerId)(ctx),
)
// OAuth callbacks reuse the sign-in handler.
router.get('/auth/google/callback', authKoaSignIn(auth))

app.use(router.routes())
app.use(router.allowedMethods())

app.listen(3000)

import { AuthError } from '@gentleduck/auth/core'

router.get('/api/me', async (ctx, next) => {
  const auth_ctx = await auth.resolveSession(ctx.req)
  if (!auth_ctx) {
    ctx.status = 401
    ctx.body = { code: 'AUTH/UNAUTHENTICATED' }
    return
  }
  ctx.body = auth_ctx.identity
})

app.use(async (ctx, next) => {
  try {
    await next()
  } catch (err) {
    if (err instanceof AuthError) {
      ctx.status = err.status
      ctx.body = err.toJSON()
      return
    }
    throw err
  }
})