// Copyright Joyent, Inc. and other Node contributors.

//

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

//

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

const util = require('util');

const net = require('net');

const assert = require('internal/assert');

const {

parsers,

freeParser,

debug,

CRLF,

continueExpression,

chunkExpression,

httpSocketSetup,

kIncomingMessage,

HTTPParser,

_checkInvalidHeaderChar: checkInvalidHeaderChar

} = require('_http_common');

const { OutgoingMessage } = require('_http_outgoing');

const { outHeadersKey, ondrain, nowDate } = require('internal/http');

const {

defaultTriggerAsyncIdScope,

getOrSetAsyncId

} = require('internal/async_hooks');

const is_reused_symbol = require('internal/freelist').symbols.is_reused_symbol;

const { IncomingMessage } = require('_http_incoming');

const {

ERR_HTTP_HEADERS_SENT,

ERR_HTTP_INVALID_STATUS_CODE,

ERR_INVALID_ARG_TYPE,

ERR_INVALID_CHAR

} = require('internal/errors').codes;

const Buffer = require('buffer').Buffer;

const kServerResponse = Symbol('ServerResponse');

const STATUS_CODES = {

100: 'Continue',

101: 'Switching Protocols',

102: 'Processing', // RFC 2518, obsoleted by RFC 4918

103: 'Early Hints',

200: 'OK',

201: 'Created',

202: 'Accepted',

203: 'Non-Authoritative Information',

204: 'No Content',

205: 'Reset Content',

206: 'Partial Content',

207: 'Multi-Status', // RFC 4918

208: 'Already Reported',

226: 'IM Used',

300: 'Multiple Choices', // RFC 7231

301: 'Moved Permanently',

302: 'Found',

303: 'See Other',

304: 'Not Modified',

305: 'Use Proxy',

307: 'Temporary Redirect',

308: 'Permanent Redirect', // RFC 7238

400: 'Bad Request',

401: 'Unauthorized',

402: 'Payment Required',

403: 'Forbidden',

404: 'Not Found',

405: 'Method Not Allowed',

406: 'Not Acceptable',

407: 'Proxy Authentication Required',

408: 'Request Timeout',

409: 'Conflict',

410: 'Gone',

411: 'Length Required',

412: 'Precondition Failed',

413: 'Payload Too Large',

414: 'URI Too Long',

415: 'Unsupported Media Type',

416: 'Range Not Satisfiable',

417: 'Expectation Failed',

418: 'I\'m a Teapot', // RFC 7168

421: 'Misdirected Request',

422: 'Unprocessable Entity', // RFC 4918

423: 'Locked', // RFC 4918

424: 'Failed Dependency', // RFC 4918

425: 'Unordered Collection', // RFC 4918

426: 'Upgrade Required', // RFC 2817

428: 'Precondition Required', // RFC 6585

429: 'Too Many Requests', // RFC 6585

431: 'Request Header Fields Too Large', // RFC 6585

451: 'Unavailable For Legal Reasons',

500: 'Internal Server Error',

501: 'Not Implemented',

502: 'Bad Gateway',

503: 'Service Unavailable',

504: 'Gateway Timeout',

505: 'HTTP Version Not Supported',

506: 'Variant Also Negotiates', // RFC 2295

507: 'Insufficient Storage', // RFC 4918

508: 'Loop Detected',

509: 'Bandwidth Limit Exceeded',

510: 'Not Extended', // RFC 2774

511: 'Network Authentication Required' // RFC 6585

};

const kOnExecute = HTTPParser.kOnExecute | 0;

function ServerResponse(req) {

OutgoingMessage.call(this);

if (req.method === 'HEAD') this._hasBody = false;

this.sendDate = true;

this._sent100 = false;

this._expect_continue = false;

if (req.httpVersionMajor < 1 || req.httpVersionMinor < 1) {

this.useChunkedEncodingByDefault = chunkExpression.test(req.headers.te);

this.shouldKeepAlive = false;

}

}

Object.setPrototypeOf(ServerResponse.prototype, OutgoingMessage.prototype);

Object.setPrototypeOf(ServerResponse, OutgoingMessage);

ServerResponse.prototype._finish = function _finish() {

DTRACE_HTTP_SERVER_RESPONSE(this.connection);

OutgoingMessage.prototype._finish.call(this);

};

ServerResponse.prototype.statusCode = 200;

ServerResponse.prototype.statusMessage = undefined;

function onServerResponseClose() {

// EventEmitter.emit makes a copy of the 'close' listeners array before

// calling the listeners. detachSocket() unregisters onServerResponseClose

// but if detachSocket() is called, directly or indirectly, by a 'close'

// listener, onServerResponseClose is still in that copy of the listeners

// array. That is, in the example below, b still gets called even though

// it's been removed by a:

//

// var EventEmitter = require('events');

// var obj = new EventEmitter();

// obj.on('event', a);

// obj.on('event', b);

// function a() { obj.removeListener('event', b) }

// function b() { throw "BAM!" }

// obj.emit('event'); // throws

//

// Ergo, we need to deal with stale 'close' events and handle the case

// where the ServerResponse object has already been deconstructed.

// Fortunately, that requires only a single if check. :-)

if (this._httpMessage) this._httpMessage.emit('close');

}

ServerResponse.prototype.assignSocket = function assignSocket(socket) {

assert(!socket._httpMessage);

socket._httpMessage = this;

socket.on('close', onServerResponseClose);

this.socket = socket;

this.connection = socket;

this.emit('socket', socket);

this._flush();

};

ServerResponse.prototype.detachSocket = function detachSocket(socket) {

assert(socket._httpMessage === this);

socket.removeListener('close', onServerResponseClose);

socket._httpMessage = null;

this.socket = this.connection = null;

};

ServerResponse.prototype.writeContinue = function writeContinue(cb) {

this._writeRaw(`HTTP/1.1 100 Continue${CRLF}${CRLF}`, 'ascii', cb);

this._sent100 = true;

};

ServerResponse.prototype.writeProcessing = function writeProcessing(cb) {

this._writeRaw(`HTTP/1.1 102 Processing${CRLF}${CRLF}`, 'ascii', cb);

};

ServerResponse.prototype._implicitHeader = function _implicitHeader() {

this.writeHead(this.statusCode);

};

ServerResponse.prototype.writeHead = writeHead;

function writeHead(statusCode, reason, obj) {

var originalStatusCode = statusCode;

statusCode |= 0;

if (statusCode < 100 || statusCode > 999) {

throw new ERR_HTTP_INVALID_STATUS_CODE(originalStatusCode);

}

if (typeof reason === 'string') {

// writeHead(statusCode, reasonPhrase[, headers])

this.statusMessage = reason;

} else {

// writeHead(statusCode[, headers])

if (!this.statusMessage)

this.statusMessage = STATUS_CODES[statusCode] || 'unknown';

obj = reason;

}

this.statusCode = statusCode;

var headers;

if (this[outHeadersKey]) {

// Slow-case: when progressive API and header fields are passed.

var k;

if (obj) {

var keys = Object.keys(obj);

for (var i = 0; i < keys.length; i++) {

k = keys[i];

if (k) this.setHeader(k, obj[k]);

}

}

if (k === undefined && this._header) {

throw new ERR_HTTP_HEADERS_SENT('render');

}

// only progressive api is used

headers = this[outHeadersKey];

} else {

// only writeHead() called

headers = obj;

}

if (checkInvalidHeaderChar(this.statusMessage))

throw new ERR_INVALID_CHAR('statusMessage');

var statusLine = `HTTP/1.1 ${statusCode} ${this.statusMessage}${CRLF}`;

if (statusCode === 204 || statusCode === 304 ||

(statusCode >= 100 && statusCode <= 199)) {

// RFC 2616, 10.2.5:

// The 204 response MUST NOT include a message-body, and thus is always

// terminated by the first empty line after the header fields.

// RFC 2616, 10.3.5:

// The 304 response MUST NOT contain a message-body, and thus is always

// terminated by the first empty line after the header fields.

// RFC 2616, 10.1 Informational 1xx:

// This class of status code indicates a provisional response,

// consisting only of the Status-Line and optional headers, and is

// terminated by an empty line.

this._hasBody = false;

}

// Don't keep alive connections where the client expects 100 Continue

// but we sent a final status; they may put extra bytes on the wire.

if (this._expect_continue && !this._sent100) {

this.shouldKeepAlive = false;

}

this._storeHeader(statusLine, headers);

return this;

}

// Docs-only deprecated: DEP0063

ServerResponse.prototype.writeHeader = ServerResponse.prototype.writeHead;

function Server(options, requestListener) {

if (!(this instanceof Server)) return new Server(options, requestListener);

if (typeof options === 'function') {

requestListener = options;

options = {};

} else if (options == null || typeof options === 'object') {

options = { ...options };

} else {

throw new ERR_INVALID_ARG_TYPE('options', 'object', options);

}

this[kIncomingMessage] = options.IncomingMessage || IncomingMessage;

this[kServerResponse] = options.ServerResponse || ServerResponse;

net.Server.call(this, { allowHalfOpen: true });

if (requestListener) {

this.on('request', requestListener);

}

// Similar option to this. Too lazy to write my own docs.

// http://www.squid-cache.org/Doc/config/half_closed_clients/

// http://wiki.squid-cache.org/SquidFaq/InnerWorkings#What_is_a_half-closed_filedescriptor.3F

this.httpAllowHalfOpen = false;

this.on('connection', connectionListener);

this.timeout = 2 * 60 * 1000;

this.keepAliveTimeout = 5000;

this.maxHeadersCount = null;

this.headersTimeout = 40 * 1000; // 40 seconds

}

util.inherits(Server, net.Server);

Server.prototype.setTimeout = function setTimeout(msecs, callback) {

this.timeout = msecs;

if (callback)

this.on('timeout', callback);

return this;

};

function connectionListener(socket) {

defaultTriggerAsyncIdScope(

getOrSetAsyncId(socket), connectionListenerInternal, this, socket

);

}

function connectionListenerInternal(server, socket) {

debug('SERVER new http connection');

httpSocketSetup(socket);

// Ensure that the server property of the socket is correctly set.

// See https://github.com/nodejs/node/issues/13435

if (socket.server === null)

socket.server = server;

// If the user has added a listener to the server,

// request, or response, then it's their responsibility.

// otherwise, destroy on timeout by default

if (server.timeout && typeof socket.setTimeout === 'function')

socket.setTimeout(server.timeout);

socket.on('timeout', socketOnTimeout);

var parser = parsers.alloc();

parser.reinitialize(HTTPParser.REQUEST, parser[is_reused_symbol]);

parser.socket = socket;

// We are starting to wait for our headers.

parser.parsingHeadersStart = nowDate();

socket.parser = parser;

// Propagate headers limit from server instance to parser

if (typeof server.maxHeadersCount === 'number') {

parser.maxHeaderPairs = server.maxHeadersCount << 1;

}

var state = {

onData: null,

onEnd: null,

onClose: null,

onDrain: null,

outgoing: [],

incoming: [],

// `outgoingData` is an approximate amount of bytes queued through all

// inactive responses. If more data than the high watermark is queued - we

// need to pause TCP socket/HTTP parser, and wait until the data will be

// sent to the client.

outgoingData: 0,

keepAliveTimeoutSet: false

};

state.onData = socketOnData.bind(undefined, server, socket, parser, state);

state.onEnd = socketOnEnd.bind(undefined, server, socket, parser, state);

state.onClose = socketOnClose.bind(undefined, socket, state);

state.onDrain = socketOnDrain.bind(undefined, socket, state);

socket.on('data', state.onData);

socket.on('error', socketOnError);

socket.on('end', state.onEnd);

socket.on('close', state.onClose);

socket.on('drain', state.onDrain);

parser.onIncoming = parserOnIncoming.bind(undefined, server, socket, state);

// We are consuming socket, so it won't get any actual data

socket.on('resume', onSocketResume);

socket.on('pause', onSocketPause);

// Override on to unconsume on `data`, `readable` listeners

socket.on = socketOnWrap;

// We only consume the socket if it has never been consumed before.

if (socket._handle) {

var external = socket._handle._externalStream;

if (!socket._handle._consumed && external) {

parser._consumed = true;

socket._handle._consumed = true;

parser.consume(external);

}

}

parser[kOnExecute] =

onParserExecute.bind(undefined, server, socket, parser, state);

socket._paused = false;

}

function updateOutgoingData(socket, state, delta) {

state.outgoingData += delta;

if (socket._paused &&

state.outgoingData < socket.writableHighWaterMark) {

return socketOnDrain(socket, state);

}

}

function socketOnDrain(socket, state) {

var needPause = state.outgoingData > socket.writableHighWaterMark;

// If we previously paused, then start reading again.

if (socket._paused && !needPause) {

socket._paused = false;

if (socket.parser)

socket.parser.resume();

socket.resume();

}

}

function socketOnTimeout() {

var req = this.parser && this.parser.incoming;

var reqTimeout = req && !req.complete && req.emit('timeout', this);

var res = this._httpMessage;

var resTimeout = res && res.emit('timeout', this);

var serverTimeout = this.server.emit('timeout', this);

if (!reqTimeout && !resTimeout && !serverTimeout)

this.destroy();

}

function socketOnClose(socket, state) {

debug('server socket close');

// mark this parser as reusable

if (socket.parser) {

freeParser(socket.parser, null, socket);

}

abortIncoming(state.incoming);

}

function abortIncoming(incoming) {

while (incoming.length) {

var req = incoming.shift();

req.aborted = true;

req.emit('aborted');

req.emit('close');

}

// abort socket._httpMessage ?

}

function socketOnEnd(server, socket, parser, state) {

var ret = parser.finish();

if (ret instanceof Error) {

debug('parse error');

socketOnError.call(socket, ret);

return;

}

if (!server.httpAllowHalfOpen) {

abortIncoming(state.incoming);

if (socket.writable) socket.end();

} else if (state.outgoing.length) {

state.outgoing[state.outgoing.length - 1]._last = true;

} else if (socket._httpMessage) {

socket._httpMessage._last = true;

} else if (socket.writable) {

socket.end();

}

}

function socketOnData(server, socket, parser, state, d) {

assert(!socket._paused);

debug('SERVER socketOnData %d', d.length);

var ret = parser.execute(d);

onParserExecuteCommon(server, socket, parser, state, ret, d);

}

function onParserExecute(server, socket, parser, state, ret) {

socket._unrefTimer();

const start = parser.parsingHeadersStart;

debug('SERVER socketOnParserExecute %d', ret);

// If we have not parsed the headers, destroy the socket

// after server.headersTimeout to protect from DoS attacks.

// start === 0 means that we have parsed headers.

if (start !== 0 && nowDate() - start > server.headersTimeout) {

const serverTimeout = server.emit('timeout', socket);

if (!serverTimeout)

socket.destroy();

return;

}

onParserExecuteCommon(server, socket, parser, state, ret, undefined);

}

const noop = () => {};

const badRequestResponse = Buffer.from(

`HTTP/1.1 400 ${STATUS_CODES[400]}${CRLF}` +

`Connection: close${CRLF}${CRLF}`, 'ascii'

);

const requestHeaderFieldsTooLargeResponse = Buffer.from(

`HTTP/1.1 431 ${STATUS_CODES[431]}${CRLF}` +

`Connection: close${CRLF}${CRLF}`, 'ascii'

);

function socketOnError(e) {

// Ignore further errors

this.removeListener('error', socketOnError);

this.on('error', noop);

if (!this.server.emit('clientError', e, this)) {

if (this.writable) {

const response = e.code === 'HPE_HEADER_OVERFLOW' ?

requestHeaderFieldsTooLargeResponse : badRequestResponse;

this.write(response);

}

this.destroy(e);

}

}

function onParserExecuteCommon(server, socket, parser, state, ret, d) {

resetSocketTimeout(server, socket, state);

if (ret instanceof Error) {

ret.rawPacket = d || parser.getCurrentBuffer();

debug('parse error', ret);

socketOnError.call(socket, ret);

} else if (parser.incoming && parser.incoming.upgrade) {

// Upgrade or CONNECT

var bytesParsed = ret;

var req = parser.incoming;

debug('SERVER upgrade or connect', req.method);

if (!d)

d = parser.getCurrentBuffer();

socket.removeListener('data', state.onData);

socket.removeListener('end', state.onEnd);

socket.removeListener('close', state.onClose);

socket.removeListener('drain', state.onDrain);

socket.removeListener('drain', ondrain);

socket.removeListener('error', socketOnError);

unconsume(parser, socket);

parser.finish();

freeParser(parser, req, socket);

parser = null;

var eventName = req.method === 'CONNECT' ? 'connect' : 'upgrade';

if (eventName === 'upgrade' || server.listenerCount(eventName) > 0) {

debug('SERVER have listener for %s', eventName);

var bodyHead = d.slice(bytesParsed, d.length);

socket.readableFlowing = null;

server.emit(eventName, req, socket, bodyHead);

} else {

// Got CONNECT method, but have no handler.

socket.destroy();

}

}

if (socket._paused && socket.parser) {

// onIncoming paused the socket, we should pause the parser as well

debug('pause parser');

socket.parser.pause();

}

}

function resOnFinish(req, res, socket, state, server) {

// Usually the first incoming element should be our request. it may

// be that in the case abortIncoming() was called that the incoming

// array will be empty.

assert(state.incoming.length === 0 || state.incoming[0] === req);

state.incoming.shift();

// If the user never called req.read(), and didn't pipe() or

// .resume() or .on('data'), then we call req._dump() so that the

// bytes will be pulled off the wire.

if (!req._consuming && !req._readableState.resumeScheduled)

req._dump();

res.detachSocket(socket);

req.emit('close');

process.nextTick(emitCloseNT, res);

if (res._last) {

if (typeof socket.destroySoon === 'function') {

socket.destroySoon();

} else {

socket.end();

}

} else if (state.outgoing.length === 0) {

if (server.keepAliveTimeout && typeof socket.setTimeout === 'function') {

socket.setTimeout(server.keepAliveTimeout);

state.keepAliveTimeoutSet = true;

}

} else {

// start sending the next message

var m = state.outgoing.shift();

if (m) {

m.assignSocket(socket);

}

}

}

function emitCloseNT(self) {

self.emit('close');

}

// The following callback is issued after the headers have been read on a

// new message. In this callback we setup the response object and pass it

// to the user.

function parserOnIncoming(server, socket, state, req, keepAlive) {

resetSocketTimeout(server, socket, state);

if (server.keepAliveTimeout > 0) {

req.on('end', resetHeadersTimeoutOnReqEnd);

}

// Set to zero to communicate that we have finished parsing.

socket.parser.parsingHeadersStart = 0;

if (req.upgrade) {

req.upgrade = req.method === 'CONNECT' ||

server.listenerCount('upgrade') > 0;

if (req.upgrade)

return 2;

}

state.incoming.push(req);

// If the writable end isn't consuming, then stop reading

// so that we don't become overwhelmed by a flood of

// pipelined requests that may never be resolved.

if (!socket._paused) {

var ws = socket._writableState;

if (ws.needDrain || state.outgoingData >= socket.writableHighWaterMark) {

socket._paused = true;

// We also need to pause the parser, but don't do that until after

// the call to execute, because we may still be processing the last

// chunk.

socket.pause();

}

}

var res = new server[kServerResponse](req);

res._onPendingData = updateOutgoingData.bind(undefined, socket, state);

res.shouldKeepAlive = keepAlive;

DTRACE_HTTP_SERVER_REQUEST(req, socket);

if (socket._httpMessage) {

// There are already pending outgoing res, append.

state.outgoing.push(res);

} else {

res.assignSocket(socket);

}

// When we're finished writing the response, check if this is the last

// response, if so destroy the socket.

res.on('finish',

resOnFinish.bind(undefined, req, res, socket, state, server));

if (req.headers.expect !== undefined &&

(req.httpVersionMajor === 1 && req.httpVersionMinor === 1)) {

if (continueExpression.test(req.headers.expect)) {

res._expect_continue = true;

if (server.listenerCount('checkContinue') > 0) {

server.emit('checkContinue', req, res);

} else {

res.writeContinue();

server.emit('request', req, res);

}

} else if (server.listenerCount('checkExpectation') > 0) {

server.emit('checkExpectation', req, res);

} else {

res.writeHead(417);

res.end();

}

} else {

server.emit('request', req, res);

}

return 0; // No special treatment.

}

function resetSocketTimeout(server, socket, state) {

if (!state.keepAliveTimeoutSet)

return;

socket.setTimeout(server.timeout || 0);

state.keepAliveTimeoutSet = false;

}

function onSocketResume() {

// It may seem that the socket is resumed, but this is an enemy's trick to

// deceive us! `resume` is emitted asynchronously, and may be called from

// `incoming.readStart()`. Stop the socket again here, just to preserve the

// state.

//

// We don't care about stream semantics for the consumed socket anyway.

if (this._paused) {

this.pause();

return;

}

if (this._handle && !this._handle.reading) {

this._handle.reading = true;

this._handle.readStart();

}

}

function onSocketPause() {

if (this._handle && this._handle.reading) {

this._handle.reading = false;

this._handle.readStop();

}

}

function unconsume(parser, socket) {

if (socket._handle) {

if (parser._consumed)

parser.unconsume();

parser._consumed = false;

socket.removeListener('pause', onSocketPause);

socket.removeListener('resume', onSocketResume);

}

}

function socketOnWrap(ev, fn) {

var res = net.Socket.prototype.on.call(this, ev, fn);

if (!this.parser) {

this.on = net.Socket.prototype.on;

return res;

}

if (ev === 'data' || ev === 'readable')

unconsume(this.parser, this);

return res;

}

function resetHeadersTimeoutOnReqEnd() {

debug('resetHeadersTimeoutOnReqEnd');

const parser = this.socket.parser;

// Parser can be null if the socket was destroyed

// in that case, there is nothing to do.

if (parser) {

parser.parsingHeadersStart = nowDate();

}

}

module.exports = {

STATUS_CODES,

Server,

ServerResponse,

_connectionListener: connectionListener,

kServerResponse

};