Software zum Installieren eines Smart-Mirror Frameworks , zum Nutzen von hochschulrelevanten Informationen, auf einem Raspberry-Pi.
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request.js 12KB

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  1. /*!
  2. * express
  3. * Copyright(c) 2009-2013 TJ Holowaychuk
  4. * Copyright(c) 2013 Roman Shtylman
  5. * Copyright(c) 2014-2015 Douglas Christopher Wilson
  6. * MIT Licensed
  7. */
  8. 'use strict';
  9. /**
  10. * Module dependencies.
  11. * @private
  12. */
  13. var accepts = require('accepts');
  14. var deprecate = require('depd')('express');
  15. var isIP = require('net').isIP;
  16. var typeis = require('type-is');
  17. var http = require('http');
  18. var fresh = require('fresh');
  19. var parseRange = require('range-parser');
  20. var parse = require('parseurl');
  21. var proxyaddr = require('proxy-addr');
  22. /**
  23. * Request prototype.
  24. * @public
  25. */
  26. var req = Object.create(http.IncomingMessage.prototype)
  27. /**
  28. * Module exports.
  29. * @public
  30. */
  31. module.exports = req
  32. /**
  33. * Return request header.
  34. *
  35. * The `Referrer` header field is special-cased,
  36. * both `Referrer` and `Referer` are interchangeable.
  37. *
  38. * Examples:
  39. *
  40. * req.get('Content-Type');
  41. * // => "text/plain"
  42. *
  43. * req.get('content-type');
  44. * // => "text/plain"
  45. *
  46. * req.get('Something');
  47. * // => undefined
  48. *
  49. * Aliased as `req.header()`.
  50. *
  51. * @param {String} name
  52. * @return {String}
  53. * @public
  54. */
  55. req.get =
  56. req.header = function header(name) {
  57. if (!name) {
  58. throw new TypeError('name argument is required to req.get');
  59. }
  60. if (typeof name !== 'string') {
  61. throw new TypeError('name must be a string to req.get');
  62. }
  63. var lc = name.toLowerCase();
  64. switch (lc) {
  65. case 'referer':
  66. case 'referrer':
  67. return this.headers.referrer
  68. || this.headers.referer;
  69. default:
  70. return this.headers[lc];
  71. }
  72. };
  73. /**
  74. * To do: update docs.
  75. *
  76. * Check if the given `type(s)` is acceptable, returning
  77. * the best match when true, otherwise `undefined`, in which
  78. * case you should respond with 406 "Not Acceptable".
  79. *
  80. * The `type` value may be a single MIME type string
  81. * such as "application/json", an extension name
  82. * such as "json", a comma-delimited list such as "json, html, text/plain",
  83. * an argument list such as `"json", "html", "text/plain"`,
  84. * or an array `["json", "html", "text/plain"]`. When a list
  85. * or array is given, the _best_ match, if any is returned.
  86. *
  87. * Examples:
  88. *
  89. * // Accept: text/html
  90. * req.accepts('html');
  91. * // => "html"
  92. *
  93. * // Accept: text/*, application/json
  94. * req.accepts('html');
  95. * // => "html"
  96. * req.accepts('text/html');
  97. * // => "text/html"
  98. * req.accepts('json, text');
  99. * // => "json"
  100. * req.accepts('application/json');
  101. * // => "application/json"
  102. *
  103. * // Accept: text/*, application/json
  104. * req.accepts('image/png');
  105. * req.accepts('png');
  106. * // => undefined
  107. *
  108. * // Accept: text/*;q=.5, application/json
  109. * req.accepts(['html', 'json']);
  110. * req.accepts('html', 'json');
  111. * req.accepts('html, json');
  112. * // => "json"
  113. *
  114. * @param {String|Array} type(s)
  115. * @return {String|Array|Boolean}
  116. * @public
  117. */
  118. req.accepts = function(){
  119. var accept = accepts(this);
  120. return accept.types.apply(accept, arguments);
  121. };
  122. /**
  123. * Check if the given `encoding`s are accepted.
  124. *
  125. * @param {String} ...encoding
  126. * @return {String|Array}
  127. * @public
  128. */
  129. req.acceptsEncodings = function(){
  130. var accept = accepts(this);
  131. return accept.encodings.apply(accept, arguments);
  132. };
  133. req.acceptsEncoding = deprecate.function(req.acceptsEncodings,
  134. 'req.acceptsEncoding: Use acceptsEncodings instead');
  135. /**
  136. * Check if the given `charset`s are acceptable,
  137. * otherwise you should respond with 406 "Not Acceptable".
  138. *
  139. * @param {String} ...charset
  140. * @return {String|Array}
  141. * @public
  142. */
  143. req.acceptsCharsets = function(){
  144. var accept = accepts(this);
  145. return accept.charsets.apply(accept, arguments);
  146. };
  147. req.acceptsCharset = deprecate.function(req.acceptsCharsets,
  148. 'req.acceptsCharset: Use acceptsCharsets instead');
  149. /**
  150. * Check if the given `lang`s are acceptable,
  151. * otherwise you should respond with 406 "Not Acceptable".
  152. *
  153. * @param {String} ...lang
  154. * @return {String|Array}
  155. * @public
  156. */
  157. req.acceptsLanguages = function(){
  158. var accept = accepts(this);
  159. return accept.languages.apply(accept, arguments);
  160. };
  161. req.acceptsLanguage = deprecate.function(req.acceptsLanguages,
  162. 'req.acceptsLanguage: Use acceptsLanguages instead');
  163. /**
  164. * Parse Range header field, capping to the given `size`.
  165. *
  166. * Unspecified ranges such as "0-" require knowledge of your resource length. In
  167. * the case of a byte range this is of course the total number of bytes. If the
  168. * Range header field is not given `undefined` is returned, `-1` when unsatisfiable,
  169. * and `-2` when syntactically invalid.
  170. *
  171. * When ranges are returned, the array has a "type" property which is the type of
  172. * range that is required (most commonly, "bytes"). Each array element is an object
  173. * with a "start" and "end" property for the portion of the range.
  174. *
  175. * The "combine" option can be set to `true` and overlapping & adjacent ranges
  176. * will be combined into a single range.
  177. *
  178. * NOTE: remember that ranges are inclusive, so for example "Range: users=0-3"
  179. * should respond with 4 users when available, not 3.
  180. *
  181. * @param {number} size
  182. * @param {object} [options]
  183. * @param {boolean} [options.combine=false]
  184. * @return {number|array}
  185. * @public
  186. */
  187. req.range = function range(size, options) {
  188. var range = this.get('Range');
  189. if (!range) return;
  190. return parseRange(size, range, options);
  191. };
  192. /**
  193. * Return the value of param `name` when present or `defaultValue`.
  194. *
  195. * - Checks route placeholders, ex: _/user/:id_
  196. * - Checks body params, ex: id=12, {"id":12}
  197. * - Checks query string params, ex: ?id=12
  198. *
  199. * To utilize request bodies, `req.body`
  200. * should be an object. This can be done by using
  201. * the `bodyParser()` middleware.
  202. *
  203. * @param {String} name
  204. * @param {Mixed} [defaultValue]
  205. * @return {String}
  206. * @public
  207. */
  208. req.param = function param(name, defaultValue) {
  209. var params = this.params || {};
  210. var body = this.body || {};
  211. var query = this.query || {};
  212. var args = arguments.length === 1
  213. ? 'name'
  214. : 'name, default';
  215. deprecate('req.param(' + args + '): Use req.params, req.body, or req.query instead');
  216. if (null != params[name] && params.hasOwnProperty(name)) return params[name];
  217. if (null != body[name]) return body[name];
  218. if (null != query[name]) return query[name];
  219. return defaultValue;
  220. };
  221. /**
  222. * Check if the incoming request contains the "Content-Type"
  223. * header field, and it contains the give mime `type`.
  224. *
  225. * Examples:
  226. *
  227. * // With Content-Type: text/html; charset=utf-8
  228. * req.is('html');
  229. * req.is('text/html');
  230. * req.is('text/*');
  231. * // => true
  232. *
  233. * // When Content-Type is application/json
  234. * req.is('json');
  235. * req.is('application/json');
  236. * req.is('application/*');
  237. * // => true
  238. *
  239. * req.is('html');
  240. * // => false
  241. *
  242. * @param {String|Array} types...
  243. * @return {String|false|null}
  244. * @public
  245. */
  246. req.is = function is(types) {
  247. var arr = types;
  248. // support flattened arguments
  249. if (!Array.isArray(types)) {
  250. arr = new Array(arguments.length);
  251. for (var i = 0; i < arr.length; i++) {
  252. arr[i] = arguments[i];
  253. }
  254. }
  255. return typeis(this, arr);
  256. };
  257. /**
  258. * Return the protocol string "http" or "https"
  259. * when requested with TLS. When the "trust proxy"
  260. * setting trusts the socket address, the
  261. * "X-Forwarded-Proto" header field will be trusted
  262. * and used if present.
  263. *
  264. * If you're running behind a reverse proxy that
  265. * supplies https for you this may be enabled.
  266. *
  267. * @return {String}
  268. * @public
  269. */
  270. defineGetter(req, 'protocol', function protocol(){
  271. var proto = this.connection.encrypted
  272. ? 'https'
  273. : 'http';
  274. var trust = this.app.get('trust proxy fn');
  275. if (!trust(this.connection.remoteAddress, 0)) {
  276. return proto;
  277. }
  278. // Note: X-Forwarded-Proto is normally only ever a
  279. // single value, but this is to be safe.
  280. var header = this.get('X-Forwarded-Proto') || proto
  281. var index = header.indexOf(',')
  282. return index !== -1
  283. ? header.substring(0, index).trim()
  284. : header.trim()
  285. });
  286. /**
  287. * Short-hand for:
  288. *
  289. * req.protocol === 'https'
  290. *
  291. * @return {Boolean}
  292. * @public
  293. */
  294. defineGetter(req, 'secure', function secure(){
  295. return this.protocol === 'https';
  296. });
  297. /**
  298. * Return the remote address from the trusted proxy.
  299. *
  300. * The is the remote address on the socket unless
  301. * "trust proxy" is set.
  302. *
  303. * @return {String}
  304. * @public
  305. */
  306. defineGetter(req, 'ip', function ip(){
  307. var trust = this.app.get('trust proxy fn');
  308. return proxyaddr(this, trust);
  309. });
  310. /**
  311. * When "trust proxy" is set, trusted proxy addresses + client.
  312. *
  313. * For example if the value were "client, proxy1, proxy2"
  314. * you would receive the array `["client", "proxy1", "proxy2"]`
  315. * where "proxy2" is the furthest down-stream and "proxy1" and
  316. * "proxy2" were trusted.
  317. *
  318. * @return {Array}
  319. * @public
  320. */
  321. defineGetter(req, 'ips', function ips() {
  322. var trust = this.app.get('trust proxy fn');
  323. var addrs = proxyaddr.all(this, trust);
  324. // reverse the order (to farthest -> closest)
  325. // and remove socket address
  326. addrs.reverse().pop()
  327. return addrs
  328. });
  329. /**
  330. * Return subdomains as an array.
  331. *
  332. * Subdomains are the dot-separated parts of the host before the main domain of
  333. * the app. By default, the domain of the app is assumed to be the last two
  334. * parts of the host. This can be changed by setting "subdomain offset".
  335. *
  336. * For example, if the domain is "tobi.ferrets.example.com":
  337. * If "subdomain offset" is not set, req.subdomains is `["ferrets", "tobi"]`.
  338. * If "subdomain offset" is 3, req.subdomains is `["tobi"]`.
  339. *
  340. * @return {Array}
  341. * @public
  342. */
  343. defineGetter(req, 'subdomains', function subdomains() {
  344. var hostname = this.hostname;
  345. if (!hostname) return [];
  346. var offset = this.app.get('subdomain offset');
  347. var subdomains = !isIP(hostname)
  348. ? hostname.split('.').reverse()
  349. : [hostname];
  350. return subdomains.slice(offset);
  351. });
  352. /**
  353. * Short-hand for `url.parse(req.url).pathname`.
  354. *
  355. * @return {String}
  356. * @public
  357. */
  358. defineGetter(req, 'path', function path() {
  359. return parse(this).pathname;
  360. });
  361. /**
  362. * Parse the "Host" header field to a hostname.
  363. *
  364. * When the "trust proxy" setting trusts the socket
  365. * address, the "X-Forwarded-Host" header field will
  366. * be trusted.
  367. *
  368. * @return {String}
  369. * @public
  370. */
  371. defineGetter(req, 'hostname', function hostname(){
  372. var trust = this.app.get('trust proxy fn');
  373. var host = this.get('X-Forwarded-Host');
  374. if (!host || !trust(this.connection.remoteAddress, 0)) {
  375. host = this.get('Host');
  376. } else if (host.indexOf(',') !== -1) {
  377. // Note: X-Forwarded-Host is normally only ever a
  378. // single value, but this is to be safe.
  379. host = host.substring(0, host.indexOf(',')).trimRight()
  380. }
  381. if (!host) return;
  382. // IPv6 literal support
  383. var offset = host[0] === '['
  384. ? host.indexOf(']') + 1
  385. : 0;
  386. var index = host.indexOf(':', offset);
  387. return index !== -1
  388. ? host.substring(0, index)
  389. : host;
  390. });
  391. // TODO: change req.host to return host in next major
  392. defineGetter(req, 'host', deprecate.function(function host(){
  393. return this.hostname;
  394. }, 'req.host: Use req.hostname instead'));
  395. /**
  396. * Check if the request is fresh, aka
  397. * Last-Modified and/or the ETag
  398. * still match.
  399. *
  400. * @return {Boolean}
  401. * @public
  402. */
  403. defineGetter(req, 'fresh', function(){
  404. var method = this.method;
  405. var res = this.res
  406. var status = res.statusCode
  407. // GET or HEAD for weak freshness validation only
  408. if ('GET' !== method && 'HEAD' !== method) return false;
  409. // 2xx or 304 as per rfc2616 14.26
  410. if ((status >= 200 && status < 300) || 304 === status) {
  411. return fresh(this.headers, {
  412. 'etag': res.get('ETag'),
  413. 'last-modified': res.get('Last-Modified')
  414. })
  415. }
  416. return false;
  417. });
  418. /**
  419. * Check if the request is stale, aka
  420. * "Last-Modified" and / or the "ETag" for the
  421. * resource has changed.
  422. *
  423. * @return {Boolean}
  424. * @public
  425. */
  426. defineGetter(req, 'stale', function stale(){
  427. return !this.fresh;
  428. });
  429. /**
  430. * Check if the request was an _XMLHttpRequest_.
  431. *
  432. * @return {Boolean}
  433. * @public
  434. */
  435. defineGetter(req, 'xhr', function xhr(){
  436. var val = this.get('X-Requested-With') || '';
  437. return val.toLowerCase() === 'xmlhttprequest';
  438. });
  439. /**
  440. * Helper function for creating a getter on an object.
  441. *
  442. * @param {Object} obj
  443. * @param {String} name
  444. * @param {Function} getter
  445. * @private
  446. */
  447. function defineGetter(obj, name, getter) {
  448. Object.defineProperty(obj, name, {
  449. configurable: true,
  450. enumerable: true,
  451. get: getter
  452. });
  453. }