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//
// 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 {
MathMin,
Symbol,
RegExpPrototypeExec,
} = primordials;
const { setImmediate } = require('timers');
const { methods, HTTPParser } = internalBinding('http_parser');
const { getOptionValue } = require('internal/options');
const insecureHTTPParser = getOptionValue('--insecure-http-parser');
const FreeList = require('internal/freelist');
const incoming = require('_http_incoming');
const {
IncomingMessage,
readStart,
readStop
} = incoming;
const kIncomingMessage = Symbol('IncomingMessage');
const kOnMessageBegin = HTTPParser.kOnMessageBegin | 0;
const kOnHeaders = HTTPParser.kOnHeaders | 0;
const kOnHeadersComplete = HTTPParser.kOnHeadersComplete | 0;
const kOnBody = HTTPParser.kOnBody | 0;
const kOnMessageComplete = HTTPParser.kOnMessageComplete | 0;
const kOnExecute = HTTPParser.kOnExecute | 0;
const kOnTimeout = HTTPParser.kOnTimeout | 0;
const MAX_HEADER_PAIRS = 2000;
// Only called in the slow case where slow means
// that the request headers were either fragmented
// across multiple TCP packets or too large to be
// processed in a single run. This method is also
// called to process trailing HTTP headers.
function parserOnHeaders(headers, url) {
// Once we exceeded headers limit - stop collecting them
if (this.maxHeaderPairs <= 0 ||
this._headers.length < this.maxHeaderPairs) {
this._headers.push(...headers);
}
this._url += url;
}
// `headers` and `url` are set only if .onHeaders() has not been called for
// this request.
// `url` is not set for response parsers but that's not applicable here since
// all our parsers are request parsers.
function parserOnHeadersComplete(versionMajor, versionMinor, headers, method,
url, statusCode, statusMessage, upgrade,
shouldKeepAlive) {
const parser = this;
const { socket } = parser;
if (headers === undefined) {
headers = parser._headers;
parser._headers = [];
}
if (url === undefined) {
url = parser._url;
parser._url = '';
}
// Parser is also used by http client
const ParserIncomingMessage = (socket && socket.server &&
socket.server[kIncomingMessage]) ||
IncomingMessage;
const incoming = parser.incoming = new ParserIncomingMessage(socket);
incoming.httpVersionMajor = versionMajor;
incoming.httpVersionMinor = versionMinor;
incoming.httpVersion = `${versionMajor}.${versionMinor}`;
incoming.url = url;
incoming.upgrade = upgrade;
let n = headers.length;
// If parser.maxHeaderPairs <= 0 assume that there's no limit.
if (parser.maxHeaderPairs > 0)
n = MathMin(n, parser.maxHeaderPairs);
incoming._addHeaderLines(headers, n);
if (typeof method === 'number') {
// server only
incoming.method = methods[method];
} else {
// client only
incoming.statusCode = statusCode;
incoming.statusMessage = statusMessage;
}
return parser.onIncoming(incoming, shouldKeepAlive);
}
function parserOnBody(b) {
const stream = this.incoming;
// If the stream has already been removed, then drop it.
if (stream === null)
return;
// Pretend this was the result of a stream._read call.
if (!stream._dumped) {
const ret = stream.push(b);
if (!ret)
readStop(this.socket);
}
}
function parserOnMessageComplete() {
const parser = this;
const stream = parser.incoming;
if (stream !== null) {
stream.complete = true;
// Emit any trailing headers.
const headers = parser._headers;
if (headers.length) {
stream._addHeaderLines(headers, headers.length);
parser._headers = [];
parser._url = '';
}
// For emit end event
stream.push(null);
}
// Force to read the next incoming message
readStart(parser.socket);
}
const parsers = new FreeList('parsers', 1000, function parsersCb() {
const parser = new HTTPParser();
cleanParser(parser);
parser[kOnHeaders] = parserOnHeaders;
parser[kOnHeadersComplete] = parserOnHeadersComplete;
parser[kOnBody] = parserOnBody;
parser[kOnMessageComplete] = parserOnMessageComplete;
return parser;
});
function closeParserInstance(parser) { parser.close(); }
// Free the parser and also break any links that it
// might have to any other things.
// TODO: All parser data should be attached to a
// single object, so that it can be easily cleaned
// up by doing `parser.data = {}`, which should
// be done in FreeList.free. `parsers.free(parser)`
// should be all that is needed.
function freeParser(parser, req, socket) {
if (parser) {
if (parser._consumed)
parser.unconsume();
cleanParser(parser);
if (parsers.free(parser) === false) {
// Make sure the parser's stack has unwound before deleting the
// corresponding C++ object through .close().
setImmediate(closeParserInstance, parser);
} else {
// Since the Parser destructor isn't going to run the destroy() callbacks
// it needs to be triggered manually.
parser.free();
}
}
if (req) {
req.parser = null;
}
if (socket) {
socket.parser = null;
}
}
const tokenRegExp = /^[\^_`a-zA-Z\-0-9!#$%&'*+.|~]+$/;
/**
* Verifies that the given val is a valid HTTP token
* per the rules defined in RFC 7230
* See https://tools.ietf.org/html/rfc7230#section-3.2.6
*/
function checkIsHttpToken(val) {
return RegExpPrototypeExec(tokenRegExp, val) !== null;
}
const headerCharRegex = /[^\t\x20-\x7e\x80-\xff]/;
/**
* True if val contains an invalid field-vchar
* field-value = *( field-content / obs-fold )
* field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
* field-vchar = VCHAR / obs-text
*/
function checkInvalidHeaderChar(val) {
return RegExpPrototypeExec(headerCharRegex, val) !== null;
}
function cleanParser(parser) {
parser._headers = [];
parser._url = '';
parser.socket = null;
parser.incoming = null;
parser.outgoing = null;
parser.maxHeaderPairs = MAX_HEADER_PAIRS;
parser[kOnMessageBegin] = null;
parser[kOnExecute] = null;
parser[kOnTimeout] = null;
parser._consumed = false;
parser.onIncoming = null;
}
function prepareError(err, parser, rawPacket) {
err.rawPacket = rawPacket || parser.getCurrentBuffer();
if (typeof err.reason === 'string')
err.message = `Parse Error: ${err.reason}`;
}
let warnedLenient = false;
function isLenient() {
if (insecureHTTPParser && !warnedLenient) {
warnedLenient = true;
process.emitWarning('Using insecure HTTP parsing');
}
return insecureHTTPParser;
}
module.exports = {
_checkInvalidHeaderChar: checkInvalidHeaderChar,
_checkIsHttpToken: checkIsHttpToken,
chunkExpression: /(?:^|\W)chunked(?:$|\W)/i,
continueExpression: /(?:^|\W)100-continue(?:$|\W)/i,
CRLF: '\r\n', // TODO: Deprecate this.
freeParser,
methods,
parsers,
kIncomingMessage,
HTTPParser,
isLenient,
prepareError,
};
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