feat: init

node_modules/koa/lib/request.js

@@ -0,0 +1,738 @@
+
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+const URL = require('url').URL;
+const net = require('net');
+const accepts = require('accepts');
+const contentType = require('content-type');
+const stringify = require('url').format;
+const parse = require('parseurl');
+const qs = require('querystring');
+const typeis = require('type-is');
+const fresh = require('fresh');
+const only = require('only');
+const util = require('util');
+
+const IP = Symbol('context#ip');
+
+/**
+ * Prototype.
+ */
+
+module.exports = {
+
+  /**
+   * Return request header.
+   *
+   * @return {Object}
+   * @api public
+   */
+
+  get header() {
+    return this.req.headers;
+  },
+
+  /**
+   * Set request header.
+   *
+   * @api public
+   */
+
+  set header(val) {
+    this.req.headers = val;
+  },
+
+  /**
+   * Return request header, alias as request.header
+   *
+   * @return {Object}
+   * @api public
+   */
+
+  get headers() {
+    return this.req.headers;
+  },
+
+  /**
+   * Set request header, alias as request.header
+   *
+   * @api public
+   */
+
+  set headers(val) {
+    this.req.headers = val;
+  },
+
+  /**
+   * Get request URL.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get url() {
+    return this.req.url;
+  },
+
+  /**
+   * Set request URL.
+   *
+   * @api public
+   */
+
+  set url(val) {
+    this.req.url = val;
+  },
+
+  /**
+   * Get origin of URL.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get origin() {
+    return `${this.protocol}://${this.host}`;
+  },
+
+  /**
+   * Get full request URL.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get href() {
+    // support: `GET http://example.com/foo`
+    if (/^https?:\/\//i.test(this.originalUrl)) return this.originalUrl;
+    return this.origin + this.originalUrl;
+  },
+
+  /**
+   * Get request method.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get method() {
+    return this.req.method;
+  },
+
+  /**
+   * Set request method.
+   *
+   * @param {String} val
+   * @api public
+   */
+
+  set method(val) {
+    this.req.method = val;
+  },
+
+  /**
+   * Get request pathname.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get path() {
+    return parse(this.req).pathname;
+  },
+
+  /**
+   * Set pathname, retaining the query string when present.
+   *
+   * @param {String} path
+   * @api public
+   */
+
+  set path(path) {
+    const url = parse(this.req);
+    if (url.pathname === path) return;
+
+    url.pathname = path;
+    url.path = null;
+
+    this.url = stringify(url);
+  },
+
+  /**
+   * Get parsed query string.
+   *
+   * @return {Object}
+   * @api public
+   */
+
+  get query() {
+    const str = this.querystring;
+    const c = this._querycache = this._querycache || {};
+    return c[str] || (c[str] = qs.parse(str));
+  },
+
+  /**
+   * Set query string as an object.
+   *
+   * @param {Object} obj
+   * @api public
+   */
+
+  set query(obj) {
+    this.querystring = qs.stringify(obj);
+  },
+
+  /**
+   * Get query string.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get querystring() {
+    if (!this.req) return '';
+    return parse(this.req).query || '';
+  },
+
+  /**
+   * Set query string.
+   *
+   * @param {String} str
+   * @api public
+   */
+
+  set querystring(str) {
+    const url = parse(this.req);
+    if (url.search === `?${str}`) return;
+
+    url.search = str;
+    url.path = null;
+
+    this.url = stringify(url);
+  },
+
+  /**
+   * Get the search string. Same as the query string
+   * except it includes the leading ?.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get search() {
+    if (!this.querystring) return '';
+    return `?${this.querystring}`;
+  },
+
+  /**
+   * Set the search string. Same as
+   * request.querystring= but included for ubiquity.
+   *
+   * @param {String} str
+   * @api public
+   */
+
+  set search(str) {
+    this.querystring = str;
+  },
+
+  /**
+   * Parse the "Host" header field host
+   * and support X-Forwarded-Host when a
+   * proxy is enabled.
+   *
+   * @return {String} hostname:port
+   * @api public
+   */
+
+  get host() {
+    const proxy = this.app.proxy;
+    let host = proxy && this.get('X-Forwarded-Host');
+    if (!host) {
+      if (this.req.httpVersionMajor >= 2) host = this.get(':authority');
+      if (!host) host = this.get('Host');
+    }
+    if (!host) return '';
+    return splitCommaSeparatedValues(host, 1)[0];
+  },
+
+  /**
+   * Parse the "Host" header field hostname
+   * and support X-Forwarded-Host when a
+   * proxy is enabled.
+   *
+   * @return {String} hostname
+   * @api public
+   */
+
+  get hostname() {
+    const host = this.host;
+    if (!host) return '';
+    if ('[' === host[0]) return this.URL.hostname || ''; // IPv6
+    return host.split(':', 1)[0];
+  },
+
+  /**
+   * Get WHATWG parsed URL.
+   * Lazily memoized.
+   *
+   * @return {URL|Object}
+   * @api public
+   */
+
+  get URL() {
+    /* istanbul ignore else */
+    if (!this.memoizedURL) {
+      const originalUrl = this.originalUrl || ''; // avoid undefined in template string
+      try {
+        this.memoizedURL = new URL(`${this.origin}${originalUrl}`);
+      } catch (err) {
+        this.memoizedURL = Object.create(null);
+      }
+    }
+    return this.memoizedURL;
+  },
+
+  /**
+   * Check if the request is fresh, aka
+   * Last-Modified and/or the ETag
+   * still match.
+   *
+   * @return {Boolean}
+   * @api public
+   */
+
+  get fresh() {
+    const method = this.method;
+    const s = this.ctx.status;
+
+    // GET or HEAD for weak freshness validation only
+    if ('GET' !== method && 'HEAD' !== method) return false;
+
+    // 2xx or 304 as per rfc2616 14.26
+    if ((s >= 200 && s < 300) || 304 === s) {
+      return fresh(this.header, this.response.header);
+    }
+
+    return false;
+  },
+
+  /**
+   * Check if the request is stale, aka
+   * "Last-Modified" and / or the "ETag" for the
+   * resource has changed.
+   *
+   * @return {Boolean}
+   * @api public
+   */
+
+  get stale() {
+    return !this.fresh;
+  },
+
+  /**
+   * Check if the request is idempotent.
+   *
+   * @return {Boolean}
+   * @api public
+   */
+
+  get idempotent() {
+    const methods = ['GET', 'HEAD', 'PUT', 'DELETE', 'OPTIONS', 'TRACE'];
+    return !!~methods.indexOf(this.method);
+  },
+
+  /**
+   * Return the request socket.
+   *
+   * @return {Connection}
+   * @api public
+   */
+
+  get socket() {
+    return this.req.socket;
+  },
+
+  /**
+   * Get the charset when present or undefined.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get charset() {
+    try {
+      const { parameters } = contentType.parse(this.req);
+      return parameters.charset || '';
+    } catch (e) {
+      return '';
+    }
+  },
+
+  /**
+   * Return parsed Content-Length when present.
+   *
+   * @return {Number}
+   * @api public
+   */
+
+  get length() {
+    const len = this.get('Content-Length');
+    if (len === '') return;
+    return ~~len;
+  },
+
+  /**
+   * Return the protocol string "http" or "https"
+   * when requested with TLS. When the proxy setting
+   * is enabled the "X-Forwarded-Proto" header
+   * field will be trusted. If you're running behind
+   * a reverse proxy that supplies https for you this
+   * may be enabled.
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get protocol() {
+    if (this.socket.encrypted) return 'https';
+    if (!this.app.proxy) return 'http';
+    const proto = this.get('X-Forwarded-Proto');
+    return proto ? splitCommaSeparatedValues(proto, 1)[0] : 'http';
+  },
+
+  /**
+   * Shorthand for:
+   *
+   *    this.protocol == 'https'
+   *
+   * @return {Boolean}
+   * @api public
+   */
+
+  get secure() {
+    return 'https' === this.protocol;
+  },
+
+  /**
+   * When `app.proxy` is `true`, parse
+   * the "X-Forwarded-For" ip address list.
+   *
+   * For example if the value was "client, proxy1, proxy2"
+   * you would receive the array `["client", "proxy1", "proxy2"]`
+   * where "proxy2" is the furthest down-stream.
+   *
+   * @return {Array}
+   * @api public
+   */
+
+  get ips() {
+    const proxy = this.app.proxy;
+    const val = this.get(this.app.proxyIpHeader);
+    let ips = proxy && val
+      ? splitCommaSeparatedValues(val)
+      : [];
+    if (this.app.maxIpsCount > 0) {
+      ips = ips.slice(-this.app.maxIpsCount);
+    }
+    return ips;
+  },
+
+  /**
+   * Return request's remote address
+   * When `app.proxy` is `true`, parse
+   * the "X-Forwarded-For" ip address list and return the first one
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get ip() {
+    if (!this[IP]) {
+      this[IP] = this.ips[0] || this.socket.remoteAddress || '';
+    }
+    return this[IP];
+  },
+
+  set ip(_ip) {
+    this[IP] = _ip;
+  },
+
+  /**
+   * Return subdomains as an array.
+   *
+   * Subdomains are the dot-separated parts of the host before the main domain
+   * of the app. By default, the domain of the app is assumed to be the last two
+   * parts of the host. This can be changed by setting `app.subdomainOffset`.
+   *
+   * For example, if the domain is "tobi.ferrets.example.com":
+   * If `app.subdomainOffset` is not set, this.subdomains is
+   * `["ferrets", "tobi"]`.
+   * If `app.subdomainOffset` is 3, this.subdomains is `["tobi"]`.
+   *
+   * @return {Array}
+   * @api public
+   */
+
+  get subdomains() {
+    const offset = this.app.subdomainOffset;
+    const hostname = this.hostname;
+    if (net.isIP(hostname)) return [];
+    return hostname
+      .split('.')
+      .reverse()
+      .slice(offset);
+  },
+
+  /**
+   * Get accept object.
+   * Lazily memoized.
+   *
+   * @return {Object}
+   * @api private
+   */
+
+  get accept() {
+    return this._accept || (this._accept = accepts(this.req));
+  },
+
+  /**
+   * Set accept object.
+   *
+   * @param {Object}
+   * @api private
+   */
+
+  set accept(obj) {
+    this._accept = obj;
+  },
+
+  /**
+   * Check if the given `type(s)` is acceptable, returning
+   * the best match when true, otherwise `false`, in which
+   * case you should respond with 406 "Not Acceptable".
+   *
+   * The `type` value may be a single mime type string
+   * such as "application/json", the extension name
+   * such as "json" or an array `["json", "html", "text/plain"]`. When a list
+   * or array is given the _best_ match, if any is returned.
+   *
+   * Examples:
+   *
+   *     // Accept: text/html
+   *     this.accepts('html');
+   *     // => "html"
+   *
+   *     // Accept: text/*, application/json
+   *     this.accepts('html');
+   *     // => "html"
+   *     this.accepts('text/html');
+   *     // => "text/html"
+   *     this.accepts('json', 'text');
+   *     // => "json"
+   *     this.accepts('application/json');
+   *     // => "application/json"
+   *
+   *     // Accept: text/*, application/json
+   *     this.accepts('image/png');
+   *     this.accepts('png');
+   *     // => false
+   *
+   *     // Accept: text/*;q=.5, application/json
+   *     this.accepts(['html', 'json']);
+   *     this.accepts('html', 'json');
+   *     // => "json"
+   *
+   * @param {String|Array} type(s)...
+   * @return {String|Array|false}
+   * @api public
+   */
+
+  accepts(...args) {
+    return this.accept.types(...args);
+  },
+
+  /**
+   * Return accepted encodings or best fit based on `encodings`.
+   *
+   * Given `Accept-Encoding: gzip, deflate`
+   * an array sorted by quality is returned:
+   *
+   *     ['gzip', 'deflate']
+   *
+   * @param {String|Array} encoding(s)...
+   * @return {String|Array}
+   * @api public
+   */
+
+  acceptsEncodings(...args) {
+    return this.accept.encodings(...args);
+  },
+
+  /**
+   * Return accepted charsets or best fit based on `charsets`.
+   *
+   * Given `Accept-Charset: utf-8, iso-8859-1;q=0.2, utf-7;q=0.5`
+   * an array sorted by quality is returned:
+   *
+   *     ['utf-8', 'utf-7', 'iso-8859-1']
+   *
+   * @param {String|Array} charset(s)...
+   * @return {String|Array}
+   * @api public
+   */
+
+  acceptsCharsets(...args) {
+    return this.accept.charsets(...args);
+  },
+
+  /**
+   * Return accepted languages or best fit based on `langs`.
+   *
+   * Given `Accept-Language: en;q=0.8, es, pt`
+   * an array sorted by quality is returned:
+   *
+   *     ['es', 'pt', 'en']
+   *
+   * @param {String|Array} lang(s)...
+   * @return {Array|String}
+   * @api public
+   */
+
+  acceptsLanguages(...args) {
+    return this.accept.languages(...args);
+  },
+
+  /**
+   * Check if the incoming request contains the "Content-Type"
+   * header field and if it contains any of the given mime `type`s.
+   * If there is no request body, `null` is returned.
+   * If there is no content type, `false` is returned.
+   * Otherwise, it returns the first `type` that matches.
+   *
+   * Examples:
+   *
+   *     // With Content-Type: text/html; charset=utf-8
+   *     this.is('html'); // => 'html'
+   *     this.is('text/html'); // => 'text/html'
+   *     this.is('text/*', 'application/json'); // => 'text/html'
+   *
+   *     // When Content-Type is application/json
+   *     this.is('json', 'urlencoded'); // => 'json'
+   *     this.is('application/json'); // => 'application/json'
+   *     this.is('html', 'application/*'); // => 'application/json'
+   *
+   *     this.is('html'); // => false
+   *
+   * @param {String|String[]} [type]
+   * @param {String[]} [types]
+   * @return {String|false|null}
+   * @api public
+   */
+
+  is(type, ...types) {
+    return typeis(this.req, type, ...types);
+  },
+
+  /**
+   * Return the request mime type void of
+   * parameters such as "charset".
+   *
+   * @return {String}
+   * @api public
+   */
+
+  get type() {
+    const type = this.get('Content-Type');
+    if (!type) return '';
+    return type.split(';')[0];
+  },
+
+  /**
+   * Return request header.
+   *
+   * The `Referrer` header field is special-cased,
+   * both `Referrer` and `Referer` are interchangeable.
+   *
+   * Examples:
+   *
+   *     this.get('Content-Type');
+   *     // => "text/plain"
+   *
+   *     this.get('content-type');
+   *     // => "text/plain"
+   *
+   *     this.get('Something');
+   *     // => ''
+   *
+   * @param {String} field
+   * @return {String}
+   * @api public
+   */
+
+  get(field) {
+    const req = this.req;
+    switch (field = field.toLowerCase()) {
+      case 'referer':
+      case 'referrer':
+        return req.headers.referrer || req.headers.referer || '';
+      default:
+        return req.headers[field] || '';
+    }
+  },
+
+  /**
+   * Inspect implementation.
+   *
+   * @return {Object}
+   * @api public
+   */
+
+  inspect() {
+    if (!this.req) return;
+    return this.toJSON();
+  },
+
+  /**
+   * Return JSON representation.
+   *
+   * @return {Object}
+   * @api public
+   */
+
+  toJSON() {
+    return only(this, [
+      'method',
+      'url',
+      'header'
+    ]);
+  }
+};
+
+/**
+ * Custom inspection implementation for newer Node.js versions.
+ *
+ * @return {Object}
+ * @api public
+ */
+
+/* istanbul ignore else */
+if (util.inspect.custom) {
+  module.exports[util.inspect.custom] = module.exports.inspect;
+}
+
+/**
+ * Split a comma-separated value string into an array of values, with an optional limit.
+ * All the values are trimmed of whitespace.
+ *
+ * @param {string} value - The comma-separated value string to split.
+ * @param {number} [limit] - The maximum number of values to return.
+ * @returns {string[]} An array of values from the comma-separated string.
+ */
+function splitCommaSeparatedValues(value, limit) {
+  return value.split(',', limit).map(v => v.trim());
+}