gancio-upstream/server/federation/index.js

const express = require('express')
const router = express.Router()
// const cors = require('cors')
const Users = require('./users')
const { Event, User, Tag, Place } = require('../api/models/models')

const settingsController =  require('../api/controller/settings')

const Helpers = require('./helpers')
const Inbox = require('./inbox')
const log = require('../log')

/**
 * Federation is calling!
 * ref: https://www.w3.org/TR/activitypub/#Overview
 */

// router.use(cors())

// middleware to check if federation is enabled
router.use((_req, res, next) => {
  if (settingsController.settings.enable_federation) { return next() }
  log.debug('[FEDI] Federation disabled!')
  return  res.status(401).send('Federation disabled')
})

router.use(express.json({ type: ['application/json', 'application/activity+json', 'application/ld+json'] }))

router.get('/m/:event_id:json(.json)?', async (req, res) => {
  log.debug('[AP] Get event details ')
  const event_id = req.params.event_id
  const json = req.params.json
  const acceptHtml = req.accepts('html', 'application/json', 'application/activity+json', 'application/ld+json') === 'html'
  if (acceptHtml && !json) { return res.redirect(301, `/event/${event_id}`) }
  const event = await Event.findByPk(req.params.event_id, { include: [User, Tag, Place] })
  if (!event) { return res.status(404).send('Not found') }
  const eventAp = event.toAP(settingsController.settings)
  eventAp['@context'] = [
    'https://www.w3.org/ns/activitystreams',
    'https://w3id.org/security/v1',
    {
      toot: 'http://joinmastodon.org/ns#',

      // A property-value pair, e.g. representing a feature of a product or place. We use this to publish this very same instance
      // https://docs.joinmastodon.org/spec/activitypub/#PropertyValue
      schema: 'http://schema.org#',
      ProperyValue: 'schema:PropertyValue',
      value: 'schema:value',

      // https://docs.joinmastodon.org/spec/activitypub/#discoverable
      "discoverable": "toot:discoverable",

      // https://docs.joinmastodon.org/spec/activitypub/#Hashtag
      "Hashtag": "https://www.w3.org/ns/activitystreams#Hashtag",

      manuallyApprovesFollowers: 'as:manuallyApprovesFollowers',

      // focal point - https://docs.joinmastodon.org/spec/activitypub/#focalPoint
      "focalPoint": {
        "@container": "@list",
        "@id": "toot:focalPoint"
      }
    }
  ]

  res.type('application/activity+json; charset=utf-8')
  return res.json(eventAp)
})

// get any message coming from federation
router.post('/u/:name/inbox', Helpers.verifySignature, Inbox)

router.get('/u/:name/outbox', Users.outbox)
// router.get('/u/:name/followers', Users.followers)

router.get('/u/:name', Users.get)

// Handle 404
router.use((req, res) => {
  log.warn(`[FEDI] 404 Page not found: ${req.path}`)
  res.status(404).send('404: Page not Found')
})

module.exports = router