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|
// 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 { HTTPParser } = internalBinding('http_parser');
const assert = require('assert').ok;
const {
parsers,
freeParser,
debug,
CRLF,
continueExpression,
chunkExpression,
httpSocketSetup,
kIncomingMessage,
_checkInvalidHeaderChar: checkInvalidHeaderChar
} = require('_http_common');
const { OutgoingMessage } = require('_http_outgoing');
const { outHeadersKey, ondrain } = require('internal/http');
const {
defaultTriggerAsyncIdScope,
getOrSetAsyncId
} = require('internal/async_hooks');
const { IncomingMessage } = require('_http_incoming');
const {
ERR_HTTP_HEADERS_SENT,
ERR_HTTP_INVALID_STATUS_CODE,
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;
}
}
util.inherits(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);
}
// 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 = util._extend({}, 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._pendingResponseData = 0;
this.maxHeadersCount = null;
}
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.socket = socket;
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();
debug('SERVER socketOnParserExecute %d', ret);
onParserExecuteCommon(server, socket, parser, state, ret, undefined);
}
const badRequestResponse = Buffer.from(
`HTTP/1.1 400 ${STATUS_CODES[400]}${CRLF}${CRLF}`, 'ascii'
);
function socketOnError(e) {
// Ignore further errors
this.removeListener('error', socketOnError);
this.on('error', () => {});
if (!this.server.emit('clientError', e, this)) {
if (this.writable) {
this.end(badRequestResponse);
return;
}
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(0);
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 (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;
}
module.exports = {
STATUS_CODES,
Server,
ServerResponse,
_connectionListener: connectionListener,
kServerResponse
};
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