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request.js
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request.js
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/**
* request.js
*
* Request class contains server only options
*
* All spec algorithm step numbers are based on https://fetch.spec.whatwg.org/commit-snapshots/ae716822cb3a61843226cd090eefc6589446c1d2/.
*/
import Url from 'url';
import Stream from 'stream';
import whatwgUrl from 'whatwg-url';
import Headers, { exportNodeCompatibleHeaders } from './headers.js';
import Body, { clone, extractContentType, getTotalBytes } from './body';
const INTERNALS = Symbol('Request internals');
const URL = whatwgUrl.URL;
// fix an issue where "format", "parse" aren't a named export for node <10
const parse_url = Url.parse;
const format_url = Url.format;
/**
* Wrapper around `new URL` to handle arbitrary URLs
*
* @param {string} urlStr
* @return {void}
*/
function parseURL(urlStr) {
/*
Check whether the URL is absolute or not
Scheme: https://tools.ietf.org/html/rfc3986#section-3.1
Absolute URL: https://tools.ietf.org/html/rfc3986#section-4.3
*/
if (/^[a-zA-Z][a-zA-Z\d+\-.]*:/.exec(urlStr)) {
urlStr = new URL(urlStr).toString()
}
// Fallback to old implementation for arbitrary URLs
return parse_url(urlStr);
}
const streamDestructionSupported = 'destroy' in Stream.Readable.prototype;
/**
* Check if a value is an instance of Request.
*
* @param Mixed input
* @return Boolean
*/
function isRequest(input) {
return (
typeof input === 'object' &&
typeof input[INTERNALS] === 'object'
);
}
function isAbortSignal(signal) {
const proto = (
signal
&& typeof signal === 'object'
&& Object.getPrototypeOf(signal)
);
return !!(proto && proto.constructor.name === 'AbortSignal');
}
/**
* Request class
*
* @param Mixed input Url or Request instance
* @param Object init Custom options
* @return Void
*/
export default class Request {
constructor(input, init = {}) {
let parsedURL;
// normalize input
if (!isRequest(input)) {
if (input && input.href) {
// in order to support Node.js' Url objects; though WHATWG's URL objects
// will fall into this branch also (since their `toString()` will return
// `href` property anyway)
parsedURL = parseURL(input.href);
} else {
// coerce input to a string before attempting to parse
parsedURL = parseURL(`${input}`);
}
input = {};
} else {
parsedURL = parseURL(input.url);
}
let method = init.method || input.method || 'GET';
method = method.toUpperCase();
if ((init.body != null || isRequest(input) && input.body !== null) &&
(method === 'GET' || method === 'HEAD')) {
throw new TypeError('Request with GET/HEAD method cannot have body');
}
let inputBody = init.body != null ?
init.body :
isRequest(input) && input.body !== null ?
clone(input) :
null;
Body.call(this, inputBody, {
timeout: init.timeout || input.timeout || 0,
size: init.size || input.size || 0
});
const headers = new Headers(init.headers || input.headers || {});
if (inputBody != null && !headers.has('Content-Type')) {
const contentType = extractContentType(inputBody);
if (contentType) {
headers.append('Content-Type', contentType);
}
}
let signal = isRequest(input)
? input.signal
: null;
if ('signal' in init) signal = init.signal
if (signal != null && !isAbortSignal(signal)) {
throw new TypeError('Expected signal to be an instanceof AbortSignal');
}
this[INTERNALS] = {
method,
redirect: init.redirect || input.redirect || 'follow',
headers,
parsedURL,
signal,
};
// node-fetch-only options
this.follow = init.follow !== undefined ?
init.follow : input.follow !== undefined ?
input.follow : 20;
this.compress = init.compress !== undefined ?
init.compress : input.compress !== undefined ?
input.compress : true;
this.counter = init.counter || input.counter || 0;
this.agent = init.agent || input.agent;
}
get method() {
return this[INTERNALS].method;
}
get url() {
return format_url(this[INTERNALS].parsedURL);
}
get headers() {
return this[INTERNALS].headers;
}
get redirect() {
return this[INTERNALS].redirect;
}
get signal() {
return this[INTERNALS].signal;
}
/**
* Clone this request
*
* @return Request
*/
clone() {
return new Request(this);
}
}
Body.mixIn(Request.prototype);
Object.defineProperty(Request.prototype, Symbol.toStringTag, {
value: 'Request',
writable: false,
enumerable: false,
configurable: true
});
Object.defineProperties(Request.prototype, {
method: { enumerable: true },
url: { enumerable: true },
headers: { enumerable: true },
redirect: { enumerable: true },
clone: { enumerable: true },
signal: { enumerable: true },
});
/**
* Convert a Request to Node.js http request options.
*
* @param Request A Request instance
* @return Object The options object to be passed to http.request
*/
export function getNodeRequestOptions(request) {
const parsedURL = request[INTERNALS].parsedURL;
const headers = new Headers(request[INTERNALS].headers);
// fetch step 1.3
if (!headers.has('Accept')) {
headers.set('Accept', '*/*');
}
// Basic fetch
if (!parsedURL.protocol || !parsedURL.hostname) {
throw new TypeError('Only absolute URLs are supported');
}
if (!/^https?:$/.test(parsedURL.protocol)) {
throw new TypeError('Only HTTP(S) protocols are supported');
}
if (
request.signal
&& request.body instanceof Stream.Readable
&& !streamDestructionSupported
) {
throw new Error('Cancellation of streamed requests with AbortSignal is not supported in node < 8');
}
// HTTP-network-or-cache fetch steps 2.4-2.7
let contentLengthValue = null;
if (request.body == null && /^(POST|PUT)$/i.test(request.method)) {
contentLengthValue = '0';
}
if (request.body != null) {
const totalBytes = getTotalBytes(request);
if (typeof totalBytes === 'number') {
contentLengthValue = String(totalBytes);
}
}
if (contentLengthValue) {
headers.set('Content-Length', contentLengthValue);
}
// HTTP-network-or-cache fetch step 2.11
if (!headers.has('User-Agent')) {
headers.set('User-Agent', 'node-fetch/1.0 (+https://github.com/bitinn/node-fetch)');
}
// HTTP-network-or-cache fetch step 2.15
if (request.compress && !headers.has('Accept-Encoding')) {
headers.set('Accept-Encoding', 'gzip,deflate');
}
let agent = request.agent;
if (typeof agent === 'function') {
agent = agent(parsedURL);
}
if (!headers.has('Connection') && !agent) {
headers.set('Connection', 'close');
}
// HTTP-network fetch step 4.2
// chunked encoding is handled by Node.js
return Object.assign({}, parsedURL, {
method: request.method,
headers: exportNodeCompatibleHeaders(headers),
agent
});
}