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var util = require('util');
var net = require('net');
var stream = require('stream');
var FreeList = require('freelist').FreeList;
var HTTPParser = process.binding('http_parser').HTTPParser;
var debug;
if (process.env.NODE_DEBUG && /http/.test(process.env.NODE_DEBUG)) {
debug = function(x) { console.error('HTTP: %s', x); };
} else {
debug = function() { };
}
var parsers = new FreeList('parsers', 1000, function() {
var parser = new HTTPParser('request');
parser.onMessageBegin = function() {
parser.incoming = new IncomingMessage(parser.socket);
parser.field = null;
parser.value = null;
};
// Only servers will get URL events.
parser.onURL = function(b, start, len) {
var slice = b.toString('ascii', start, start + len);
if (parser.incoming.url) {
parser.incoming.url += slice;
} else {
// Almost always will branch here.
parser.incoming.url = slice;
}
};
parser.onHeaderField = function(b, start, len) {
var slice = b.toString('ascii', start, start + len).toLowerCase();
if (parser.value != undefined) {
parser.incoming._addHeaderLine(parser.field, parser.value);
parser.field = null;
parser.value = null;
}
if (parser.field) {
parser.field += slice;
} else {
parser.field = slice;
}
};
parser.onHeaderValue = function(b, start, len) {
var slice = b.toString('ascii', start, start + len);
if (parser.value) {
parser.value += slice;
} else {
parser.value = slice;
}
};
parser.onHeadersComplete = function(info) {
if (parser.field && (parser.value != undefined)) {
parser.incoming._addHeaderLine(parser.field, parser.value);
parser.field = null;
parser.value = null;
}
parser.incoming.httpVersionMajor = info.versionMajor;
parser.incoming.httpVersionMinor = info.versionMinor;
parser.incoming.httpVersion = info.versionMajor + '.' + info.versionMinor;
if (info.method) {
// server only
parser.incoming.method = info.method;
} else {
// client only
parser.incoming.statusCode = info.statusCode;
}
parser.incoming.upgrade = info.upgrade;
var isHeadResponse = false;
if (!info.upgrade) {
// For upgraded connections, we'll emit this after parser.execute
// so that we can capture the first part of the new protocol
isHeadResponse = parser.onIncoming(parser.incoming, info.shouldKeepAlive);
}
return isHeadResponse;
};
parser.onBody = function(b, start, len) {
// TODO body encoding?
var slice = b.slice(start, start + len);
if (parser.incoming._decoder) {
var string = parser.incoming._decoder.write(slice);
if (string.length) parser.incoming.emit('data', string);
} else {
parser.incoming.emit('data', slice);
}
};
parser.onMessageComplete = function() {
this.incoming.complete = true;
if (parser.field && (parser.value != undefined)) {
parser.incoming._addHeaderLine(parser.field, parser.value);
}
if (!parser.incoming.upgrade) {
// For upgraded connections, also emit this after parser.execute
parser.incoming.emit('end');
}
};
return parser;
});
exports.parsers = parsers;
var CRLF = '\r\n';
var STATUS_CODES = exports.STATUS_CODES = {
100 : 'Continue',
101 : 'Switching Protocols',
102 : 'Processing', // RFC 2518, obsoleted by RFC 4918
200 : 'OK',
201 : 'Created',
202 : 'Accepted',
203 : 'Non-Authoritative Information',
204 : 'No Content',
205 : 'Reset Content',
206 : 'Partial Content',
207 : 'Multi-Status', // RFC 4918
300 : 'Multiple Choices',
301 : 'Moved Permanently',
302 : 'Moved Temporarily',
303 : 'See Other',
304 : 'Not Modified',
305 : 'Use Proxy',
307 : 'Temporary Redirect',
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 Time-out',
409 : 'Conflict',
410 : 'Gone',
411 : 'Length Required',
412 : 'Precondition Failed',
413 : 'Request Entity Too Large',
414 : 'Request-URI Too Large',
415 : 'Unsupported Media Type',
416 : 'Requested Range Not Satisfiable',
417 : 'Expectation Failed',
418 : 'I\'m a teapot', // RFC 2324
422 : 'Unprocessable Entity', // RFC 4918
423 : 'Locked', // RFC 4918
424 : 'Failed Dependency', // RFC 4918
425 : 'Unordered Collection', // RFC 4918
426 : 'Upgrade Required', // RFC 2817
500 : 'Internal Server Error',
501 : 'Not Implemented',
502 : 'Bad Gateway',
503 : 'Service Unavailable',
504 : 'Gateway Time-out',
505 : 'HTTP Version not supported',
506 : 'Variant Also Negotiates', // RFC 2295
507 : 'Insufficient Storage', // RFC 4918
509 : 'Bandwidth Limit Exceeded',
510 : 'Not Extended' // RFC 2774
};
var connectionExpression = /Connection/i;
var transferEncodingExpression = /Transfer-Encoding/i;
var closeExpression = /close/i;
var chunkExpression = /chunk/i;
var contentLengthExpression = /Content-Length/i;
var expectExpression = /Expect/i;
var continueExpression = /100-continue/i;
/* Abstract base class for ServerRequest and ClientResponse. */
function IncomingMessage(socket) {
stream.Stream.call(this);
// TODO Remove one of these eventually.
this.socket = socket;
this.connection = socket;
this.httpVersion = null;
this.complete = false;
this.headers = {};
this.trailers = {};
this.readable = true;
// request (server) only
this.url = '';
this.method = null;
// response (client) only
this.statusCode = null;
this.client = this.socket;
}
util.inherits(IncomingMessage, stream.Stream);
exports.IncomingMessage = IncomingMessage;
IncomingMessage.prototype.destroy = function(error) {
this.socket.destroy(error);
};
IncomingMessage.prototype.setEncoding = function(encoding) {
var StringDecoder = require('string_decoder').StringDecoder; // lazy load
this._decoder = new StringDecoder(encoding);
};
IncomingMessage.prototype.pause = function() {
this.socket.pause();
};
IncomingMessage.prototype.resume = function() {
this.socket.resume();
};
// Add the given (field, value) pair to the message
//
// Per RFC2616, section 4.2 it is acceptable to join multiple instances of the
// same header with a ', ' if the header in question supports specification of
// multiple values this way. If not, we declare the first instance the winner
// and drop the second. Extended header fields (those beginning with 'x-') are
// always joined.
IncomingMessage.prototype._addHeaderLine = function(field, value) {
var dest = this.complete ? this.trailers : this.headers;
switch (field) {
// Array headers:
case 'set-cookie':
if (field in dest) {
dest[field].push(value);
} else {
dest[field] = [value];
}
break;
// Comma separate. Maybe make these arrays?
case 'accept':
case 'accept-charset':
case 'accept-encoding':
case 'accept-language':
case 'connection':
case 'cookie':
if (field in dest) {
dest[field] += ', ' + value;
} else {
dest[field] = value;
}
break;
default:
if (field.slice(0, 2) == 'x-') {
// except for x-
if (field in dest) {
dest[field] += ', ' + value;
} else {
dest[field] = value;
}
} else {
// drop duplicates
if (!(field in dest)) dest[field] = value;
}
break;
}
};
function OutgoingMessage(socket) {
stream.Stream.call(this);
// TODO Remove one of these eventually.
this.socket = socket;
this.connection = socket;
this.output = [];
this.outputEncodings = [];
this.writable = true;
this._last = false;
this.chunkedEncoding = false;
this.shouldKeepAlive = true;
this.useChunkedEncodingByDefault = true;
this._hasBody = true;
this._trailer = '';
this.finished = false;
}
util.inherits(OutgoingMessage, stream.Stream);
exports.OutgoingMessage = OutgoingMessage;
OutgoingMessage.prototype.destroy = function(error) {
this.socket.destroy(error);
};
// This abstract either writing directly to the socket or buffering it.
OutgoingMessage.prototype._send = function(data, encoding) {
// This is a shameful hack to get the headers and first body chunk onto
// the same packet. Future versions of Node are going to take care of
// this at a lower level and in a more general way.
if (!this._headerSent) {
if (typeof data === 'string') {
data = this._header + data;
} else {
this.output.unshift(this._header);
this.outputEncodings.unshift('ascii');
}
this._headerSent = true;
}
return this._writeRaw(data, encoding);
};
OutgoingMessage.prototype._writeRaw = function(data, encoding) {
if (this.connection._outgoing[0] === this && this.connection.writable) {
// There might be pending data in the this.output buffer.
while (this.output.length) {
if (!this.connection.writable) {
this._buffer(data, encoding);
return false;
}
var c = this.output.shift();
var e = this.outputEncodings.shift();
this.connection.write(c, e);
}
// Directly write to socket.
return this.connection.write(data, encoding);
} else {
this._buffer(data, encoding);
return false;
}
};
OutgoingMessage.prototype._buffer = function(data, encoding) {
if (data.length === 0) return;
var length = this.output.length;
if (length === 0 || typeof data != 'string') {
this.output.push(data);
encoding = encoding || 'ascii';
this.outputEncodings.push(encoding);
return false;
}
var lastEncoding = this.outputEncodings[length - 1];
var lastData = this.output[length - 1];
if ((lastEncoding === encoding) ||
(!encoding && data.constructor === lastData.constructor)) {
this.output[length - 1] = lastData + data;
return false;
}
this.output.push(data);
encoding = encoding || 'ascii';
this.outputEncodings.push(encoding);
return false;
};
OutgoingMessage.prototype._storeHeader = function(firstLine, headers) {
var sentConnectionHeader = false;
var sentContentLengthHeader = false;
var sentTransferEncodingHeader = false;
var sentExpect = false;
// firstLine in the case of request is: 'GET /index.html HTTP/1.1\r\n'
// in the case of response it is: 'HTTP/1.1 200 OK\r\n'
var messageHeader = firstLine;
var field, value;
var self = this;
function store(field, value) {
messageHeader += field + ': ' + value + CRLF;
if (connectionExpression.test(field)) {
sentConnectionHeader = true;
if (closeExpression.test(value)) {
self._last = true;
} else {
self.shouldKeepAlive = true;
}
} else if (transferEncodingExpression.test(field)) {
sentTransferEncodingHeader = true;
if (chunkExpression.test(value)) self.chunkedEncoding = true;
} else if (contentLengthExpression.test(field)) {
sentContentLengthHeader = true;
} else if (expectExpression.test(field)) {
sentExpect = true;
}
}
if (headers) {
var keys = Object.keys(headers);
var isArray = (Array.isArray(headers));
var field, value;
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
if (isArray) {
field = headers[key][0];
value = headers[key][1];
} else {
field = key;
value = headers[key];
}
if (Array.isArray(value)) {
for (var j = 0; j < value.length; j++) {
store(field, value[j]);
}
} else {
store(field, value);
}
}
}
// keep-alive logic
if (sentConnectionHeader == false) {
if (this.shouldKeepAlive &&
(sentContentLengthHeader || this.useChunkedEncodingByDefault)) {
messageHeader += 'Connection: keep-alive\r\n';
} else {
this._last = true;
messageHeader += 'Connection: close\r\n';
}
}
if (sentContentLengthHeader == false && sentTransferEncodingHeader == false) {
if (this._hasBody) {
if (this.useChunkedEncodingByDefault) {
messageHeader += 'Transfer-Encoding: chunked\r\n';
this.chunkedEncoding = true;
} else {
this._last = true;
}
} else {
// Make sure we don't end the 0\r\n\r\n at the end of the message.
this.chunkedEncoding = false;
}
}
this._header = messageHeader + CRLF;
this._headerSent = false;
// wait until the first body chunk, or close(), is sent to flush,
// UNLESS we're sending Expect: 100-continue.
if (sentExpect) this._send('');
};
OutgoingMessage.prototype.write = function(chunk, encoding) {
if (!this._header) {
throw new Error('You have to call writeHead() before write()');
}
if (!this._hasBody) {
console.error('This type of response MUST NOT have a body. ' +
'Ignoring write() calls.');
return true;
}
if (typeof chunk !== 'string' && !Buffer.isBuffer(chunk) &&
!Array.isArray(chunk)) {
throw new TypeError('first argument must be a string, Array, or Buffer');
}
if (chunk.length === 0) return false;
var len, ret;
if (this.chunkedEncoding) {
if (typeof(chunk) === 'string') {
len = Buffer.byteLength(chunk, encoding);
var chunk = len.toString(16) + CRLF + chunk + CRLF;
debug('string chunk = ' + util.inspect(chunk));
ret = this._send(chunk, encoding);
} else {
// buffer
len = chunk.length;
this._send(len.toString(16) + CRLF);
this._send(chunk);
ret = this._send(CRLF);
}
} else {
ret = this._send(chunk, encoding);
}
debug('write ret = ' + ret);
return ret;
};
OutgoingMessage.prototype.addTrailers = function(headers) {
this._trailer = '';
var keys = Object.keys(headers);
var isArray = (Array.isArray(headers));
var field, value;
for (var i = 0, l = keys.length; i < l; i++) {
var key = keys[i];
if (isArray) {
field = headers[key][0];
value = headers[key][1];
} else {
field = key;
value = headers[key];
}
this._trailer += field + ': ' + value + CRLF;
}
};
OutgoingMessage.prototype.end = function(data, encoding) {
var ret;
var hot = this._headerSent === false &&
typeof(data) === 'string' &&
data.length > 0 &&
this.output.length === 0 &&
this.connection.writable &&
this.connection._outgoing[0] === this;
if (hot) {
// Hot path. They're doing
// res.writeHead();
// res.end(blah);
// HACKY.
if (this.chunkedEncoding) {
var l = Buffer.byteLength(data, encoding).toString(16);
ret = this.connection.write(this._header + l + CRLF +
data + '\r\n0\r\n' +
this._trailer + '\r\n', encoding);
} else {
ret = this.connection.write(this._header + data, encoding);
}
this._headerSent = true;
} else if (data) {
// Normal body write.
ret = this.write(data, encoding);
}
if (!hot) {
if (this.chunkedEncoding) {
ret = this._send('0\r\n' + this._trailer + '\r\n'); // Last chunk.
} else {
// Force a flush, HACK.
ret = this._send('');
}
}
this.finished = true;
// There is the first message on the outgoing queue, and we've sent
// everything to the socket.
if (this.output.length === 0 && this.connection._outgoing[0] === this) {
debug('outgoing message end. shifting because was flushed');
this.connection._onOutgoingSent();
}
return ret;
};
function ServerResponse(req) {
OutgoingMessage.call(this, req.socket);
if (req.method === 'HEAD') this._hasBody = false;
if (req.httpVersionMajor < 1 || req.httpVersionMinor < 1) {
this.useChunkedEncodingByDefault = false;
this.shouldKeepAlive = false;
}
}
util.inherits(ServerResponse, OutgoingMessage);
exports.ServerResponse = ServerResponse;
ServerResponse.prototype.writeContinue = function() {
this._writeRaw('HTTP/1.1 100 Continue' + CRLF + CRLF, 'ascii');
this._sent100 = true;
};
ServerResponse.prototype.writeHead = function(statusCode) {
var reasonPhrase, headers, headerIndex;
if (typeof arguments[1] == 'string') {
reasonPhrase = arguments[1];
headerIndex = 2;
} else {
reasonPhrase = STATUS_CODES[statusCode] || 'unknown';
headerIndex = 1;
}
if (typeof arguments[headerIndex] == 'object') {
headers = arguments[headerIndex];
} else {
headers = {};
}
var statusLine = 'HTTP/1.1 ' + statusCode.toString() + ' ' +
reasonPhrase + CRLF;
if (statusCode === 204 || statusCode === 304 ||
(100 <= statusCode && 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);
};
ServerResponse.prototype.writeHeader = function() {
this.writeHead.apply(this, arguments);
};
function ClientRequest(socket, method, url, headers) {
OutgoingMessage.call(this, socket);
this.method = method = method.toUpperCase();
this.shouldKeepAlive = false;
if (method === 'GET' || method === 'HEAD') {
this.useChunkedEncodingByDefault = false;
} else {
this.useChunkedEncodingByDefault = true;
}
this._last = true;
this._storeHeader(method + ' ' + url + ' HTTP/1.1\r\n', headers);
}
util.inherits(ClientRequest, OutgoingMessage);
exports.ClientRequest = ClientRequest;
function outgoingFlush(socket) {
// This logic is probably a bit confusing. Let me explain a bit:
//
// In both HTTP servers and clients it is possible to queue up several
// outgoing messages. This is easiest to imagine in the case of a client.
// Take the following situation:
//
// req1 = client.request('GET', '/');
// req2 = client.request('POST', '/');
//
// When the user does
//
// req2.write('hello world\n');
//
// it's possible that the first request has not been completely flushed to
// the socket yet. Thus the outgoing messages need to be prepared to queue
// up data internally before sending it on further to the socket's queue.
//
// This function, outgoingFlush(), is called by both the Server and Client
// to attempt to flush any pending messages out to the socket.
var message = socket._outgoing[0];
if (!message) return;
var ret;
while (message.output.length) {
if (!socket.writable) return; // XXX Necessary?
var data = message.output.shift();
var encoding = message.outputEncodings.shift();
ret = socket.write(data, encoding);
}
if (message.finished) {
socket._onOutgoingSent();
} else if (ret) {
message.emit('drain');
}
}
function httpSocketSetup(socket) {
// An array of outgoing messages for the socket. In pipelined connections
// we need to keep track of the order they were sent.
socket._outgoing = [];
// NOTE: be sure not to use ondrain elsewhere in this file!
socket.ondrain = function() {
var message = socket._outgoing[0];
if (message) message.emit('drain');
};
}
function Server(requestListener) {
if (!(this instanceof Server)) return new Server(requestListener);
net.Server.call(this, { allowHalfOpen: true });
if (requestListener) {
this.addListener('request', requestListener);
}
this.addListener('connection', connectionListener);
}
util.inherits(Server, net.Server);
exports.Server = Server;
exports.createServer = function(requestListener) {
return new Server(requestListener);
};
function connectionListener(socket) {
var self = this;
debug('SERVER new http connection');
httpSocketSetup(socket);
socket.setTimeout(2 * 60 * 1000); // 2 minute timeout
socket.addListener('timeout', function() {
socket.destroy();
});
var parser = parsers.alloc();
parser.reinitialize('request');
parser.socket = socket;
socket.addListener('error', function(e) {
self.emit('clientError', e);
});
socket.ondata = function(d, start, end) {
var ret = parser.execute(d, start, end - start);
if (ret instanceof Error) {
debug('parse error');
socket.destroy(ret);
} else if (parser.incoming && parser.incoming.upgrade) {
var bytesParsed = ret;
socket.ondata = null;
socket.onend = null;
var req = parser.incoming;
// This is start + byteParsed + 1 due to the error of getting \n
// in the upgradeHead from the closing lines of the headers
var upgradeHead = d.slice(start + bytesParsed + 1, end);
if (self.listeners('upgrade').length) {
self.emit('upgrade', req, req.socket, upgradeHead);
} else {
// Got upgrade header, but have no handler.
socket.destroy();
}
}
};
socket.onend = function() {
parser.finish();
if (socket._outgoing.length) {
socket._outgoing[socket._outgoing.length - 1]._last = true;
outgoingFlush(socket);
} else {
socket.end();
}
};
socket.addListener('close', function() {
// unref the parser for easy gc
parsers.free(parser);
});
// At the end of each response message, after it has been flushed to the
// socket. Here we insert logic about what to do next.
socket._onOutgoingSent = function(message) {
var message = socket._outgoing.shift();
if (message._last) {
// No more messages to be pushed out.
socket.destroySoon();
} else if (socket._outgoing.length) {
// Push out the next message.
outgoingFlush(socket);
}
};
// 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.
parser.onIncoming = function(req, shouldKeepAlive) {
var res = new ServerResponse(req);
debug('server response shouldKeepAlive: ' + shouldKeepAlive);
res.shouldKeepAlive = shouldKeepAlive;
socket._outgoing.push(res);
if ('expect' in req.headers &&
(req.httpVersionMajor == 1 && req.httpVersionMinor == 1) &&
continueExpression.test(req.headers['expect'])) {
res._expect_continue = true;
if (self.listeners('checkContinue').length) {
self.emit('checkContinue', req, res);
} else {
res.writeContinue();
self.emit('request', req, res);
}
} else {
self.emit('request', req, res);
}
return false; // Not a HEAD response. (Not even a response!)
};
}
exports._connectionListener = connectionListener;
function Client() {
if (!(this instanceof Client)) return new Client();
net.Stream.call(this, { allowHalfOpen: true });
var self = this;
// Possible states:
// - disconnected
// - connecting
// - connected
this._state = 'disconnected';
httpSocketSetup(self);
function onData(d, start, end) {
if (!self.parser) {
throw new Error('parser not initialized prior to Client.ondata call');
}
var ret = self.parser.execute(d, start, end - start);
if (ret instanceof Error) {
self.destroy(ret);
} else if (self.parser.incoming && self.parser.incoming.upgrade) {
var bytesParsed = ret;
self.ondata = null;
self.onend = null;
var req = self.parser.incoming;
var upgradeHead = d.slice(start + bytesParsed + 1, end);
if (self.listeners('upgrade').length) {
self.emit('upgrade', req, self, upgradeHead);
} else {
self.destroy();
}
}
};
self.addListener('connect', function() {
debug('CLIENT connected');
self.ondata = onData;
self.onend = onEnd;
self._state = 'connected';
self._initParser();
outgoingFlush(self);
});
function onEnd() {
if (self.parser) self.parser.finish();
debug('CLIENT got end closing. state = ' + self._state);
self.end();
};
self.addListener('close', function(e) {
self._state = 'disconnected';
if (e) return;
debug('CLIENT onClose. state = ' + self._state);
// finally done with the request
self._outgoing.shift();
// If there are more requests to handle, reconnect.
if (self._outgoing.length) {
self._ensureConnection();
} else if (self.parser) {
parsers.free(self.parser);
self.parser = null;
}
});
}
util.inherits(Client, net.Stream);
exports.Client = Client;
exports.createClient = function(port, host, https, credentials) {
var c = new Client();
c.port = port;
c.host = host;
c.https = https;
c.credentials = credentials;
return c;
};
Client.prototype._initParser = function() {
var self = this;
if (!self.parser) self.parser = parsers.alloc();
self.parser.reinitialize('response');
self.parser.socket = self;
self.parser.onIncoming = function(res) {
debug('CLIENT incoming response!');
var req = self._outgoing[0];
// Responses to HEAD requests are AWFUL. Ask Ryan.
// A major oversight in HTTP. Hence this nastiness.
var isHeadResponse = req.method == 'HEAD';
debug('CLIENT isHeadResponse ' + isHeadResponse);
if (res.statusCode == 100) {
// restart the parser, as this is a continue message.
req.emit('continue');
return true;
}
if (req.shouldKeepAlive && res.headers.connection === 'close') {
req.shouldKeepAlive = false;
}
res.addListener('end', function() {
debug('CLIENT request complete disconnecting. state = ' + self._state);
// For the moment we reconnect for every request. FIXME!
// All that should be required for keep-alive is to not reconnect,
// but outgoingFlush instead.
if (req.shouldKeepAlive) {
outgoingFlush(self);
self._outgoing.shift();
outgoingFlush(self);
} else {
self.end();
}
});
req.emit('response', res);
return isHeadResponse;
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