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request.ts
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request.ts
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import { ServerRequest, Accepts, typeofrequest, isIP } from "../deps.ts";
import { defineGetter } from "./utils/defineGetter.ts";
import { fresh } from "./utils/fresh.ts";
import { parseUrl } from "./utils/parseUrl.ts";
import { Request, Response } from "../src/types.ts";
/**
* Request prototype.
*
* @public
*/
export const request: Request = Object.create(ServerRequest.prototype);
/**
* Check if the given `type(s)` is acceptable, returning
* the best match when true, otherwise `undefined`, in which
* case you should respond with 406 "Not Acceptable".
*
* The `type` value may be a single MIME type string
* such as "application/json", an extension name
* such as "json", a comma-delimited list such as "json, html, text/plain",
* an argument list such as `"json", "html", "text/plain"`,
* 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
* req.accepts('html');
* // => "html"
*
* // Accept: text/*, application/json
* req.accepts('html');
* // => "html"
* req.accepts('text/html');
* // => "text/html"
* req.accepts('json, text');
* // => "json"
* req.accepts('application/json');
* // => "application/json"
*
* // Accept: text/*, application/json
* req.accepts('image/png');
* req.accepts('png');
* // => undefined
*
* // Accept: text/*;q=.5, application/json
* req.accepts(['html', 'json']);
* req.accepts('html', 'json');
* req.accepts('html, json');
* // => "json"
*
* @param {string|string[]} type
* @return {string[]}
* @public
*/
request.accepts = function (this: Request) {
const accept = new Accepts(this.headers);
return accept.types.apply(accept, arguments as any);
};
/**
* Check if the given `charset`s are acceptable,
* otherwise you should respond with 406 "Not Acceptable".
*
* @param {String} ...charset
* @return {String|Array}
* @public
*/
request.acceptsCharsets = function (this: Request) {
const accept = new Accepts(this.headers);
return accept.charsets.apply(accept, arguments as any);
};
/**
* Check if the given `encoding`s are accepted.
*
* @param {String} ...encoding
* @return {String|Array}
* @public
*/
request.acceptsEncodings = function (this: Request) {
const accept = new Accepts(this.headers);
return accept.encodings.apply(accept, arguments as any);
};
/**
* Check if the given `lang`s are acceptable,
* otherwise you should respond with 406 "Not Acceptable".
*
* @param {String} ...lang
* @return {String|Array}
* @public
*/
request.acceptsLanguages = function (this: Request) {
const accept = new Accepts(this.headers);
return accept.languages.apply(accept, arguments as any);
};
/**
* Return request header.
*
* The `Referrer` header field is special-cased,
* both `Referrer` and `Referer` are interchangeable.
*
* Examples:
*
* req.get('Content-Type');
* // => "text/plain"
*
* req.get('content-type');
* // => "text/plain"
*
* req.get('Something');
* // => undefined
*
* Aliased as `req.header()`.
*
* @param {string} name
* @return {string}
* @public
*/
request.get = function get(name: string): string {
const lc = name.toLowerCase();
switch (lc) {
case "referer":
case "referrer":
return this.headers.get("referrer") ||
this.headers.get("referer") || "";
default:
return this.headers.get(lc) || "";
}
};
// TODO: req.range()
/**
* Check if the incoming request contains the "Content-Type"
* header field, and it contains the give mime `type`.
*
* Examples:
*
* // With Content-Type: text/html; charset=utf-8
* req.is('html');
* req.is('text/html');
* req.is('text/*');
* // => true
*
* // When Content-Type is application/json
* req.is('json');
* req.is('application/json');
* req.is('application/*');
* // => true
*
* req.is('html');
* // => false
*
* @param {String|Array} types...
* @return {String|false|null}
* @public
*/
request.is = function is(this: Request, types: string | string[]) {
let arr = types;
// support flattened arguments
if (!Array.isArray(types)) {
arr = new Array(arguments.length);
for (let i = 0; i < arr.length; i++) {
arr[i] = arguments[i];
}
}
return typeofrequest(this.headers, arr as string[]);
};
/**
* Return the protocol string "http" or "https"
* when requested with TLS. When the "trust proxy"
* setting trusts the socket address, the
* "X-Forwarded-Proto" header field will be trusted
* and used if present.
*
* If you're running behind a reverse proxy that
* supplies https for you this may be enabled.
*
* @return {string}
* @public
*/
defineGetter(request, "protocol", function protocol(this: Request) {
const proto = this.proto.includes("https") ? "https" : "http";
return proto;
// TODO: trust proxy work.
// const trust = this.app.get("trust proxy fn");
// TODO: consider (this.conn.remoteAddr as Deno.NetAddr).hostname
// if (!trust(this.connection.remoteAddress, 0)) {
// return proto;
// }
// Note: X-Forwarded-Proto is normally only ever a
// single value, but this is to be safe.
// const header = this.get("X-Forwarded-Proto") || proto;
// const index = header.indexOf(",");
// return index !== -1 ? header.substring(0, index).trim() : header.trim();
});
/**
* Short-hand for:
*
* req.protocol === 'https'
*
* @return {Boolean}
* @public
*/
defineGetter(request, "secure", function secure(this: Request) {
return this.protocol === "https";
});
// TODO: req.ip
// TODO: req.ips
/**
* 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 "subdomain offset".
*
* For example, if the domain is "deno.dinosaurs.example.com":
* If "subdomain offset" is not set, req.subdomains is `["dinosaurs", "deno"]`.
* If "subdomain offset" is 3, req.subdomains is `["deno"]`.
*
* @return {Array}
* @public
*/
defineGetter(request, "subdomains", function subdomains(this: Request) {
const hostname = this.hostname;
if (!hostname) return [];
const offset = this.app.get("subdomain offset");
const subdomains = !isIP(hostname)
? hostname.split(".").reverse()
: [hostname];
return subdomains.slice(offset);
});
/**
* Returns the pathname of the URL.
*
* @return {String}
* @public
*/
defineGetter(request, "path", function path(this: Request) {
return (parseUrl(this) || {}).pathname;
});
/**
* Parse the "Host" header field to a hostname.
*
* When the "trust proxy" setting trusts the socket
* address, the "X-Forwarded-Host" header field will
* be trusted.
*
* @return {String}
* @public
*/
defineGetter(request, "hostname", function hostname(this: Request) {
// TODO: trust proxy work
const host = this.get("Host");
if (!host) return;
// IPv6 literal support
const offset = host[0] === "[" ? host.indexOf("]") + 1 : 0;
const index = host.indexOf(":", offset);
return index !== -1 ? host.substring(0, index) : host;
});
/**
* Check if the request is fresh, aka
* Last-Modified and/or the ETag
* still match.
*
* @return {boolean}
* @public
*/
defineGetter(request, "fresh", function (this: Request): boolean {
const method = this.method;
const res = this.res as Response;
const status = res.status as number;
// GET or HEAD for weak freshness validation only
if ("GET" !== method && "HEAD" !== method) {
return false;
}
// 2xx or 304 as per rfc2616 14.26
if ((status >= 200 && status < 300) || 304 === status) {
return fresh(Object.fromEntries(this.headers), {
"etag": res.get("ETag"),
"last-modified": res.get("Last-Modified"),
});
}
return false;
});
/**
* Check if the request is stale, aka
* "Last-Modified" and / or the "ETag" for the
* resource has changed.
*
* @return {Boolean}
* @public
*/
defineGetter(request, "stale", function stale(this: Request): boolean {
return !this.fresh;
});
/**
* Check if the request was an _XMLHttpRequest_.
*
* @return {Boolean}
* @public
*/
defineGetter(request, "xhr", function xhr(this: Request) {
const val = this.get("X-Requested-With") || "";
return val.toLowerCase() === "xmlhttprequest";
});