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119 lines
3.4 KiB
119 lines
3.4 KiB
'use strict'
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const path = require('path')
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const http = require('http')
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const url = require('url')
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const arrayify = require('array-back')
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const t = require('typical')
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const pathToRegexp = require('path-to-regexp')
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const debug = require('debug')('local-web-server')
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/**
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* @module middleware
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*/
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exports.proxyRequest = proxyRequest
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exports.blacklist = blacklist
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exports.mockResponses = mockResponses
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exports.mime = mime
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function proxyRequest (route, app) {
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const httpProxy = require('http-proxy')
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const proxy = httpProxy.createProxyServer({
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changeOrigin: true
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})
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return function proxyMiddleware () {
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const next = arguments[arguments.length - 1]
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const keys = []
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route.re = pathToRegexp(route.from, keys)
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route.new = this.url.replace(route.re, route.to)
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keys.forEach((key, index) => {
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const re = RegExp(`:${key.name}`, 'g')
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route.new = route.new
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.replace(re, arguments[index + 1] || '')
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})
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/* test no keys remain in the new path */
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keys.length = 0
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pathToRegexp(url.parse(route.new).path, keys)
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if (keys.length) {
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this.throw(500, `[PROXY] Invalid target URL: ${route.new}`)
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return next()
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}
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this.response = false
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debug('proxy request', `from: ${this.path}, to: ${url.parse(route.new).href}`)
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proxy.once('error', err => {
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this.throw(500, `[PROXY] ${err.message}: ${route.new}`)
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})
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proxy.once('proxyReq', function (proxyReq) {
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proxyReq.path = url.parse(route.new).path
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})
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proxy.web(this.req, this.res, { target: route.new })
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}
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}
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function blacklist (forbid) {
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return function blacklist (ctx, next) {
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if (forbid.some(expression => pathToRegexp(expression).test(ctx.path))) {
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ctx.throw(403, http.STATUS_CODES[403])
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} else {
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return next()
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}
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}
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}
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function mime (mimeTypes) {
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return function mime (ctx, next) {
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return next().then(() => {
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const reqPathExtension = path.extname(ctx.path).slice(1)
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Object.keys(mimeTypes).forEach(mimeType => {
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const extsToOverride = mimeTypes[mimeType]
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if (extsToOverride.indexOf(reqPathExtension) > -1) ctx.type = mimeType
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})
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})
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}
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}
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function mockResponses (route, targets) {
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targets = arrayify(targets)
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debug('mock route: %s, targets: %j', route, targets);
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const pathRe = pathToRegexp(route)
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return function mockResponse (ctx, next) {
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if (pathRe.test(ctx.url)) {
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const testValue = require('test-value')
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/* find a mock with compatible method and accepts */
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let target = targets.find(target => {
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return testValue(target, {
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request: {
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method: [ ctx.method, undefined ],
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accepts: type => ctx.accepts(type)
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}
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})
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})
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/* else take the first target without a request (no request means 'all requests') */
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if (!target) {
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target = targets.find(target => !target.request)
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}
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if (target) {
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debug('target response: %s', target.response)
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if (t.isFunction(target.response)) {
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const pathMatches = ctx.url.match(pathRe).slice(1)
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target.response.apply(null, [ctx].concat(pathMatches))
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} else if (t.isPlainObject(target.response)) {
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Object.assign(ctx.response, target.response)
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} else {
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throw new Error(`Invalid response: ${JSON.stringify(target.response)}`)
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}
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}
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} else {
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return next()
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}
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}
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}
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