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| 'use strict'
const router = module.exports = { }
const _ = {
assign: require('lodash.assign'),
omit: require('lodash.omit')
}
const express = require('express')
let app
let server
const bodyParser = require('body-parser')
const cookieParser = require('cookie-parser')
const jsonApi = require('./jsonApi.js')
const debug = require('./debugging.js')
const responseHelper = require('./responseHelper.js')
const url = require('url')
const metrics = require('./metrics.js')
const graphQl = require('./graphQl/index.js')
router.applyMiddleware = () => {
app = app || jsonApi._apiConfig.router || express()
app.use((req, res, next) => {
res.set({
'Content-Type': 'application/vnd.api+json',
'Access-Control-Allow-Origin': '*',
'Access-Control-Allow-Methods': 'GET, POST, PATCH, DELETE, OPTIONS',
'Access-Control-Allow-Headers': req.headers['access-control-request-headers'] || '',
'Cache-Control': 'private, must-revalidate, max-age=0',
'Expires': 'Thu, 01 Jan 1970 00:00:00'
})
if (req.method === 'OPTIONS') {
return res.status(204).end()
}
return next()
})
app.use((req, res, next) => {
if (!req.headers['content-type'] && !req.headers.accept) return next()
if (req.headers['content-type']) {
// 415 Unsupported Media Type
if (req.headers['content-type'].match(/^application\/vnd\.api\+json;.+$/)) {
return res.status(415).end(`HTTP 415 Unsupported Media Type - [${req.headers['content-type']}]`)
}
// Convert "application/vnd.api+json" content type to "application/json".
// This enables the express body parser to correctly parse the JSON payload.
if (req.headers['content-type'].match(/^application\/vnd\.api\+json$/)) {
req.headers['content-type'] = 'application/json'
}
}
if (req.headers.accept) {
// 406 Not Acceptable
let matchingTypes = req.headers.accept.split(/, ?/)
matchingTypes = matchingTypes.filter(mediaType => // Accept application/*, */vnd.api+json, */* and the correct JSON:API type.
mediaType.match(/^(\*|application)\/(\*|json|vnd\.api\+json)$/) || mediaType.match(/\*\/\*/))
if (matchingTypes.length === 0) {
return res.status(406).end()
}
}
return next()
})
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }))
app.use(cookieParser())
if (!jsonApi._apiConfig.router) {
app.disable('x-powered-by')
app.disable('etag')
}
graphQl.with(app)
let requestId = 0
app.route('*').all((req, res, next) => {
debug.requestCounter(requestId++, req.method, req.url)
if (requestId > 1000) requestId = 0
next()
})
}
router.listen = port => {
if (!server) {
if (jsonApi._apiConfig.protocol === 'https') {
server = require('https').createServer(jsonApi._apiConfig.tls || {}, app)
} else {
server = require('http').createServer(app)
}
server.listen(port)
}
}
router.close = () => {
if (server) {
server.close()
server = null
}
}
router._routes = { }
router.bindRoute = (config, callback) => {
const path = jsonApi._apiConfig.base + config.path
const verb = config.verb.toLowerCase()
const routeHandler = (req, res, extras) => {
let request = router._getParams(req)
request = _.assign(request, extras)
const resourceConfig = jsonApi._resources[request.params.type]
request.resourceConfig = resourceConfig
res._request = request
res._startDate = new Date()
router.authenticate(request, res, () => callback(request, resourceConfig, res))
}
router._routes[verb] = router._routes[verb] || { }
router._routes[verb][config.path] = routeHandler
app[verb](path, routeHandler)
}
router.authenticate = (request, res, callback) => {
if (!router._authFunction) return callback()
router._authFunction(request, err => {
if (!err) return callback()
const errorWrapper = {
status: '401',
code: 'UNAUTHORIZED',
title: 'Authentication Failed',
detail: err || 'You are not authorised to access this resource.'
}
const payload = responseHelper.generateError(request, errorWrapper)
res.status(401).end(Buffer.from(JSON.stringify(payload)))
})
}
router.authenticateWith = authFunction => {
router._authFunction = authFunction
}
router.bind404 = callback => {
app.use((req, res) => {
const request = router._getParams(req)
return callback(request, res)
})
}
router.bindErrorHandler = callback => {
app.use((error, req, res, next) => {
const request = router._getParams(req)
return callback(request, res, error, next)
})
}
router._getParams = req => {
let urlParts = req.url.split(jsonApi._apiConfig.base)
urlParts.shift()
urlParts = urlParts.join(jsonApi._apiConfig.base).split('?')
const headersToRemove = [
'host', 'connection', 'accept-encoding', 'accept-language', 'content-length'
]
let combined
let reqUrl = req.url
if (jsonApi._apiConfig.urlPrefixAlias) {
combined = jsonApi._apiConfig.urlPrefixAlias.replace(/\/$/, '')
reqUrl = reqUrl.replace(jsonApi._apiConfig.base, '/')
} else {
combined = url.format({
protocol: jsonApi._apiConfig.protocol,
hostname: jsonApi._apiConfig.hostname,
port: jsonApi._apiConfig.port
})
}
combined += reqUrl
return {
params: _.assign(req.params, req.body, req.query),
headers: req.headers,
safeHeaders: _.omit(req.headers, headersToRemove),
cookies: req.cookies,
originalUrl: req.originalUrl,
route: {
verb: req.method,
host: req.headers.host,
base: jsonApi._apiConfig.base,
path: urlParts.shift() || '',
query: urlParts.shift() || '',
combined
}
}
}
router.sendResponse = (res, payload, httpCode) => {
const timeDiff = (new Date()) - res._startDate
metrics.processResponse(res._request, httpCode, payload, timeDiff)
res.status(httpCode).end(Buffer.from(JSON.stringify(payload)))
}
router.getExpressServer = () => {
app = app || jsonApi._apiConfig.router || express()
return app
}
|