cshapiro@google.com
1472427af8
This reverts commit 63480a81fccbde001494dd535cd06a8fa02ed261. Review URL: https://chromiumcodereview.appspot.com//10379018 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@7352 260f80e4-7a28-3924-810f-c04153c831b5
719 lines
24 KiB
Dart
719 lines
24 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Global constants.
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class _Const {
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// Bytes for "HTTP".
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static final HTTP = const [72, 84, 84, 80];
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// Bytes for "HTTP/1.".
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static final HTTP1DOT = const [72, 84, 84, 80, 47, 49, 46];
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// Bytes for "HTTP/1.0".
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static final HTTP10 = const [72, 84, 84, 80, 47, 49, 46, 48];
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// Bytes for "HTTP/1.1".
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static final HTTP11 = const [72, 84, 84, 80, 47, 49, 46, 49];
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static final END_CHUNKED = const [0x30, 13, 10, 13, 10];
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// Bytes for '()<>@,;:\\"/[]?={} \t'.
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static final SEPARATORS = const [40, 41, 60, 62, 64, 44, 59, 58, 92, 34, 47,
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91, 93, 63, 61, 123, 125, 32, 9];
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// Bytes for '()<>@,;:\\"/[]?={} \t\r\n'.
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static final SEPARATORS_AND_CR_LF = const [40, 41, 60, 62, 64, 44, 59, 58, 92,
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34, 47, 91, 93, 63, 61, 123, 125,
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32, 9, 13, 10];
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}
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// Frequently used character codes.
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class _CharCode {
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static final int HT = 9;
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static final int LF = 10;
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static final int CR = 13;
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static final int SP = 32;
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static final int COMMA = 44;
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static final int SLASH = 47;
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static final int ZERO = 48;
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static final int ONE = 49;
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static final int COLON = 58;
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static final int SEMI_COLON = 59;
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}
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// States of the HTTP parser state machine.
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class _State {
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static final int START = 0;
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static final int METHOD_OR_RESPONSE_HTTP_VERSION = 1;
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static final int RESPONSE_HTTP_VERSION = 2;
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static final int REQUEST_LINE_METHOD = 3;
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static final int REQUEST_LINE_URI = 4;
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static final int REQUEST_LINE_HTTP_VERSION = 5;
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static final int REQUEST_LINE_ENDING = 6;
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static final int RESPONSE_LINE_STATUS_CODE = 7;
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static final int RESPONSE_LINE_REASON_PHRASE = 8;
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static final int RESPONSE_LINE_ENDING = 9;
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static final int HEADER_START = 10;
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static final int HEADER_FIELD = 11;
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static final int HEADER_VALUE_START = 12;
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static final int HEADER_VALUE = 13;
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static final int HEADER_VALUE_FOLDING_OR_ENDING = 14;
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static final int HEADER_VALUE_FOLD_OR_END = 15;
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static final int HEADER_ENDING = 16;
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static final int CHUNK_SIZE_STARTING_CR = 17;
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static final int CHUNK_SIZE_STARTING_LF = 18;
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static final int CHUNK_SIZE = 19;
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static final int CHUNK_SIZE_EXTENSION = 20;
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static final int CHUNK_SIZE_ENDING = 21;
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static final int CHUNKED_BODY_DONE_CR = 22;
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static final int CHUNKED_BODY_DONE_LF = 23;
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static final int BODY = 24;
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static final int CLOSED = 25;
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static final int UPGRADED = 26;
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static final int FAILURE = 27;
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static final int FIRST_BODY_STATE = CHUNK_SIZE_STARTING_CR;
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}
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// HTTP version of the request or response being parsed.
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class _HttpVersion {
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static final int UNDETERMINED = 0;
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static final int HTTP10 = 1;
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static final int HTTP11 = 2;
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}
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// States of the HTTP parser state machine.
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class _MessageType {
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static final int UNDETERMINED = 0;
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static final int REQUEST = 1;
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static final int RESPONSE = 0;
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}
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/**
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* HTTP parser which parses the HTTP stream as data is supplied
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* through the [:writeList:] and [:connectionClosed:] methods. As the
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* data is parsed the following callbacks are called:
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*
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* [:requestStart:]
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* [:responseStart:]
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* [:headerReceived:]
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* [:headersComplete:]
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* [:dataReceived:]
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* [:dataEnd:]
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* [:error:]
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*
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* If an HTTP parser error occours it is possible to get an exception
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* thrown from the [:writeList:] and [:connectionClosed:] methods if
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* the error callback is not set.
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*
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* The connection upgrades (e.g. switching from HTTP/1.1 to the
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* WebSocket protocol) is handled in a special way. If connection
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* upgrade is specified in the headers, then on the callback to
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* [:headersComplete:] the [:upgrade:] property on the [:HttpParser:]
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* object will be [:true:] indicating that from now on the protocol is
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* not HTTP anymore and no more callbacks will happen, that is
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* [:dataReceived:] and [:dataEnd:] are not called in this case as
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* there is no more HTTP data. After the upgrade the call to
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* [:writeList:] causing the upgrade will return with the number of
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* bytes parsed as HTTP. Any unparsed bytes is part of the protocol
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* the connection is upgrading to and should be handled according to
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* that protocol.
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*/
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class _HttpParser {
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_HttpParser() {
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_reset();
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}
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// From RFC 2616.
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// generic-message = start-line
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// *(message-header CRLF)
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// CRLF
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// [ message-body ]
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// start-line = Request-Line | Status-Line
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// Request-Line = Method SP Request-URI SP HTTP-Version CRLF
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// Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
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// message-header = field-name ":" [ field-value ]
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int writeList(List<int> buffer, int offset, int count) {
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int index = offset;
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int lastIndex = offset + count;
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try {
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if (_state == _State.CLOSED) {
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throw new HttpParserException("Data on closed connection");
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}
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if (_state == _State.UPGRADED) {
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throw new HttpParserException("Data on upgraded connection");
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}
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if (_state == _State.FAILURE) {
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throw new HttpParserException("Data on failed connection");
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}
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while ((index < lastIndex) && _state != _State.FAILURE && _state != _State.UPGRADED) {
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int byte = buffer[index];
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switch (_state) {
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case _State.START:
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if (byte == _Const.HTTP[0]) {
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// Start parsing method or HTTP version.
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_httpVersionIndex = 1;
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_state = _State.METHOD_OR_RESPONSE_HTTP_VERSION;
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} else {
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// Start parsing method.
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if (!_isTokenChar(byte)) {
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throw new HttpParserException("Invalid request method");
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}
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_method_or_status_code.addCharCode(byte);
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_state = _State.REQUEST_LINE_METHOD;
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}
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break;
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case _State.METHOD_OR_RESPONSE_HTTP_VERSION:
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if (_httpVersionIndex < _Const.HTTP.length &&
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byte == _Const.HTTP[_httpVersionIndex]) {
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// Continue parsing HTTP version.
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_httpVersionIndex++;
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} else if (_httpVersionIndex == _Const.HTTP.length &&
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byte == _CharCode.SLASH) {
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// HTTP/ parsed. As method is a token this cannot be a method anymore.
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_httpVersionIndex++;
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_state = _State.RESPONSE_HTTP_VERSION;
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} else {
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// Did not parse HTTP version. Expect method instead.
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for (int i = 0; i < _httpVersionIndex; i++) {
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_method_or_status_code.addCharCode(_Const.HTTP[i]);
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}
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//_method_or_status_code.addCharCode(byte);
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_httpVersion = _HttpVersion.UNDETERMINED;
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_state = _State.REQUEST_LINE_URI;
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}
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break;
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case _State.RESPONSE_HTTP_VERSION:
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if (_httpVersionIndex < _Const.HTTP1DOT.length) {
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// Continue parsing HTTP version.
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_expect(byte, _Const.HTTP1DOT[_httpVersionIndex]);
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_httpVersionIndex++;
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} else if (_httpVersionIndex == _Const.HTTP1DOT.length &&
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byte == _CharCode.ONE) {
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// HTTP/1.1 parsed.
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_httpVersion = _HttpVersion.HTTP11;
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_persistentConnection = true;
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_httpVersionIndex++;
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} else if (_httpVersionIndex == _Const.HTTP1DOT.length &&
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byte == _CharCode.ZERO) {
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// HTTP/1.0 parsed.
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_httpVersion = _HttpVersion.HTTP10;
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_persistentConnection = false;
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_httpVersionIndex++;
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} else if (_httpVersionIndex == _Const.HTTP1DOT.length + 1) {
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_expect(byte, _CharCode.SP);
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// HTTP version parsed.
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_state = _State.RESPONSE_LINE_STATUS_CODE;
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} else {
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throw new HttpParserException("Invalid response line");
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}
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break;
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case _State.REQUEST_LINE_METHOD:
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if (byte == _CharCode.SP) {
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_state = _State.REQUEST_LINE_URI;
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} else {
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if (_Const.SEPARATORS_AND_CR_LF.indexOf(byte) != -1) {
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throw new HttpParserException("Invalid request method");
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}
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_method_or_status_code.addCharCode(byte);
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}
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break;
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case _State.REQUEST_LINE_URI:
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if (byte == _CharCode.SP) {
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_state = _State.REQUEST_LINE_HTTP_VERSION;
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_httpVersionIndex = 0;
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} else {
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if (byte == _CharCode.CR || byte == _CharCode.LF) {
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throw new HttpParserException("Invalid request URI");
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}
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_uri_or_reason_phrase.addCharCode(byte);
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}
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break;
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case _State.REQUEST_LINE_HTTP_VERSION:
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if (_httpVersionIndex < _Const.HTTP1DOT.length) {
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_expect(byte, _Const.HTTP11[_httpVersionIndex]);
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_httpVersionIndex++;
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} else if (_httpVersionIndex == _Const.HTTP1DOT.length) {
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if (byte == _CharCode.ONE) {
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// HTTP/1.1 parsed.
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_httpVersion = _HttpVersion.HTTP11;
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_persistentConnection = true;
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_httpVersionIndex++;
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} else if (byte == _CharCode.ZERO) {
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// HTTP/1.0 parsed.
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_httpVersion = _HttpVersion.HTTP10;
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_persistentConnection = false;
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_httpVersionIndex++;
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} else {
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throw new HttpParserException("Invalid response line");
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}
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} else {
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_expect(byte, _CharCode.CR);
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_state = _State.REQUEST_LINE_ENDING;
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}
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break;
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case _State.REQUEST_LINE_ENDING:
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_expect(byte, _CharCode.LF);
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_messageType = _MessageType.REQUEST;
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if (requestStart != null) {
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requestStart(_method_or_status_code.toString(),
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_uri_or_reason_phrase.toString(),
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version);
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}
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_method_or_status_code.clear();
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_uri_or_reason_phrase.clear();
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_state = _State.HEADER_START;
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break;
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case _State.RESPONSE_LINE_STATUS_CODE:
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if (byte == _CharCode.SP) {
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if (_method_or_status_code.length != 3) {
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throw new HttpParserException("Invalid response status code");
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}
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_state = _State.RESPONSE_LINE_REASON_PHRASE;
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} else {
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if (byte < 0x30 && 0x39 < byte) {
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throw new HttpParserException("Invalid response status code");
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} else {
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_method_or_status_code.addCharCode(byte);
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}
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}
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break;
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case _State.RESPONSE_LINE_REASON_PHRASE:
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if (byte == _CharCode.CR) {
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if (_uri_or_reason_phrase.length == 0) {
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throw new HttpParserException("Invalid response reason phrase");
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}
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_state = _State.RESPONSE_LINE_ENDING;
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} else {
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if (byte == _CharCode.CR || byte == _CharCode.LF) {
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throw new HttpParserException("Invalid response reason phrase");
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}
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_uri_or_reason_phrase.addCharCode(byte);
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}
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break;
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case _State.RESPONSE_LINE_ENDING:
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_expect(byte, _CharCode.LF);
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_messageType == _MessageType.RESPONSE;
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int statusCode = Math.parseInt(_method_or_status_code.toString());
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if (statusCode < 100 || statusCode > 599) {
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throw new HttpParserException("Invalid response status code");
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} else {
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// Check whether this response will never have a body.
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_noMessageBody =
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statusCode <= 199 || statusCode == 204 || statusCode == 304;
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}
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if (responseStart != null) {
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responseStart(statusCode, _uri_or_reason_phrase.toString(), version);
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}
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_method_or_status_code.clear();
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_uri_or_reason_phrase.clear();
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_state = _State.HEADER_START;
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break;
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case _State.HEADER_START:
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if (byte == _CharCode.CR) {
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_state = _State.HEADER_ENDING;
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} else {
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// Start of new header field.
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_headerField.addCharCode(_toLowerCase(byte));
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_state = _State.HEADER_FIELD;
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}
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break;
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case _State.HEADER_FIELD:
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if (byte == _CharCode.COLON) {
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_state = _State.HEADER_VALUE_START;
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} else {
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if (!_isTokenChar(byte)) {
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throw new HttpParserException("Invalid header field name");
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}
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_headerField.addCharCode(_toLowerCase(byte));
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}
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break;
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case _State.HEADER_VALUE_START:
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if (byte == _CharCode.CR) {
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_state = _State.HEADER_VALUE_FOLDING_OR_ENDING;
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} else if (byte != _CharCode.SP && byte != _CharCode.HT) {
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// Start of new header value.
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_headerValue.addCharCode(byte);
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_state = _State.HEADER_VALUE;
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}
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break;
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case _State.HEADER_VALUE:
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if (byte == _CharCode.CR) {
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_state = _State.HEADER_VALUE_FOLDING_OR_ENDING;
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} else {
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_headerValue.addCharCode(byte);
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}
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break;
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case _State.HEADER_VALUE_FOLDING_OR_ENDING:
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_expect(byte, _CharCode.LF);
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_state = _State.HEADER_VALUE_FOLD_OR_END;
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break;
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case _State.HEADER_VALUE_FOLD_OR_END:
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if (byte == _CharCode.SP || byte == _CharCode.HT) {
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_state = _State.HEADER_VALUE_START;
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} else {
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String headerField = _headerField.toString();
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String headerValue =_headerValue.toString();
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bool reportHeader = true;
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if (headerField == "content-length" && !_chunked) {
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// Ignore the Content-Length header if Transfer-Encoding
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// is chunked (RFC 2616 section 4.4)
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_contentLength = Math.parseInt(headerValue);
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} else if (headerField == "connection") {
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List<String> tokens = _tokenizeFieldValue(headerValue);
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for (int i = 0; i < tokens.length; i++) {
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String token = tokens[i].toLowerCase();
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if (token == "keep-alive") {
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_persistentConnection = true;
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} else if (token == "close") {
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_persistentConnection = false;
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} else if (token == "upgrade") {
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_connectionUpgrade = true;
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}
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if (headerReceived != null) {
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headerReceived(headerField, token);
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}
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}
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reportHeader = false;
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} else if (headerField == "transfer-encoding" &&
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headerValue.toLowerCase() == "chunked") {
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// Ignore the Content-Length header if Transfer-Encoding
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// is chunked (RFC 2616 section 4.4)
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_chunked = true;
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_contentLength = -1;
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}
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if (reportHeader && headerReceived != null) {
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headerReceived(headerField, headerValue);
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}
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_headerField.clear();
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_headerValue.clear();
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if (byte == _CharCode.CR) {
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_state = _State.HEADER_ENDING;
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} else {
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// Start of new header field.
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_headerField.addCharCode(_toLowerCase(byte));
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_state = _State.HEADER_FIELD;
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}
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}
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break;
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case _State.HEADER_ENDING:
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_expect(byte, _CharCode.LF);
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if (_connectionUpgrade) {
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_state = _State.UPGRADED;
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_unparsedData =
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buffer.getRange(index + 1, count - (index + 1 - offset));
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if (headersComplete != null) headersComplete();
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} else {
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if (headersComplete != null) headersComplete();
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if (_chunked) {
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_state = _State.CHUNK_SIZE;
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_remainingContent = 0;
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} else if (_contentLength == 0 ||
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(_messageType == _MessageType.REQUEST &&
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_contentLength == -1) ||
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(_messageType == _MessageType.RESPONSE &&
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(_noMessageBody || _responseToMethod == "HEAD"))) {
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// If there is no message body get ready to process the
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// next request.
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_bodyEnd();
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_reset();
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} else if (_contentLength > 0) {
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_remainingContent = _contentLength;
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_state = _State.BODY;
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} else {
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// Neither chunked nor content length. End of body
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// indicated by close.
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_state = _State.BODY;
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}
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}
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break;
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case _State.CHUNK_SIZE_STARTING_CR:
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_expect(byte, _CharCode.CR);
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_state = _State.CHUNK_SIZE_STARTING_LF;
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break;
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case _State.CHUNK_SIZE_STARTING_LF:
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_expect(byte, _CharCode.LF);
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_state = _State.CHUNK_SIZE;
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break;
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case _State.CHUNK_SIZE:
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if (byte == _CharCode.CR) {
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_state = _State.CHUNK_SIZE_ENDING;
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} else if (byte == _CharCode.SEMI_COLON) {
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_state = _State.CHUNK_SIZE_EXTENSION;
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} else {
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int value = _expectHexDigit(byte);
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_remainingContent = _remainingContent * 16 + value;
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}
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break;
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case _State.CHUNK_SIZE_EXTENSION:
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if (byte == _CharCode.CR) {
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_state = _State.CHUNK_SIZE_ENDING;
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}
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break;
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case _State.CHUNK_SIZE_ENDING:
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_expect(byte, _CharCode.LF);
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if (_remainingContent > 0) {
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_state = _State.BODY;
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} else {
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_state = _State.CHUNKED_BODY_DONE_CR;
|
|
}
|
|
break;
|
|
|
|
case _State.CHUNKED_BODY_DONE_CR:
|
|
_expect(byte, _CharCode.CR);
|
|
_state = _State.CHUNKED_BODY_DONE_LF;
|
|
break;
|
|
|
|
case _State.CHUNKED_BODY_DONE_LF:
|
|
_expect(byte, _CharCode.LF);
|
|
_bodyEnd();
|
|
_reset();
|
|
break;
|
|
|
|
case _State.BODY:
|
|
// The body is not handled one byte at a time but in blocks.
|
|
int dataAvailable = lastIndex - index;
|
|
List<int> data;
|
|
if (_remainingContent == null ||
|
|
dataAvailable <= _remainingContent) {
|
|
data = new Uint8List(dataAvailable);
|
|
data.setRange(0, dataAvailable, buffer, index);
|
|
} else {
|
|
data = new Uint8List(_remainingContent);
|
|
data.setRange(0, _remainingContent, buffer, index);
|
|
}
|
|
|
|
if (dataReceived != null) dataReceived(data);
|
|
if (_remainingContent != null) {
|
|
_remainingContent -= data.length;
|
|
}
|
|
index += data.length;
|
|
if (_remainingContent == 0) {
|
|
if (!_chunked) {
|
|
_bodyEnd();
|
|
_reset();
|
|
} else {
|
|
_state = _State.CHUNK_SIZE_STARTING_CR;
|
|
}
|
|
}
|
|
|
|
// Hack - as we always do index++ below.
|
|
index--;
|
|
break;
|
|
|
|
case _state = _State.FAILURE:
|
|
// Should be unreachable.
|
|
assert(false);
|
|
break;
|
|
|
|
default:
|
|
// Should be unreachable.
|
|
assert(false);
|
|
break;
|
|
}
|
|
|
|
// Move to the next byte.
|
|
index++;
|
|
}
|
|
} catch (var e) {
|
|
// Report the error through the error callback if any. Otherwise
|
|
// throw the error.
|
|
if (error != null) {
|
|
error(e);
|
|
_state = _State.FAILURE;
|
|
} else {
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
// Return the number of bytes parsed.
|
|
return index - offset;
|
|
}
|
|
|
|
int connectionClosed() {
|
|
if (_state < _State.FIRST_BODY_STATE) {
|
|
_state = _State.FAILURE;
|
|
// Report the error through the error callback if any. Otherwise
|
|
// throw the error.
|
|
var e = new HttpParserException(
|
|
"Connection closed before full header was received");
|
|
if (error != null) {
|
|
error(e);
|
|
return;
|
|
}
|
|
throw e;
|
|
}
|
|
|
|
if (!_chunked && _contentLength == -1) {
|
|
if (_state != _State.START) {
|
|
if (dataEnd != null) dataEnd(true);
|
|
}
|
|
_state = _State.CLOSED;
|
|
} else {
|
|
_state = _State.FAILURE;
|
|
// Report the error through the error callback if any. Otherwise
|
|
// throw the error.
|
|
var e = new HttpParserException(
|
|
"Connection closed before full body was received");
|
|
if (error != null) {
|
|
error(e);
|
|
return;
|
|
}
|
|
throw e;
|
|
}
|
|
}
|
|
|
|
String get version() {
|
|
switch (_httpVersion) {
|
|
case _HttpVersion.HTTP10:
|
|
return "1.0";
|
|
break;
|
|
case _HttpVersion.HTTP11:
|
|
return "1.1";
|
|
break;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
int get messageType() => _messageType;
|
|
int get contentLength() => _contentLength;
|
|
bool get upgrade() => _connectionUpgrade && _state == _State.UPGRADED;
|
|
bool get persistentConnection() => _persistentConnection;
|
|
|
|
void set responseToMethod(String method) => _responseToMethod = method;
|
|
|
|
bool get isIdle() => _state == _State.START;
|
|
|
|
List<int> get unparsedData() => _unparsedData;
|
|
|
|
void _bodyEnd() {
|
|
if (dataEnd != null) {
|
|
dataEnd(_messageType == _MessageType.RESPONSE && !_persistentConnection);
|
|
}
|
|
}
|
|
|
|
_reset() {
|
|
_state = _State.START;
|
|
_messageType = _MessageType.UNDETERMINED;
|
|
_headerField = new StringBuffer();
|
|
_headerValue = new StringBuffer();
|
|
_method_or_status_code = new StringBuffer();
|
|
_uri_or_reason_phrase = new StringBuffer();
|
|
|
|
_httpVersion = _HttpVersion.UNDETERMINED;
|
|
_contentLength = -1;
|
|
_persistentConnection = false;
|
|
_connectionUpgrade = false;
|
|
_chunked = false;
|
|
|
|
_noMessageBody = false;
|
|
_responseToMethod = null;
|
|
_remainingContent = null;
|
|
}
|
|
|
|
bool _isTokenChar(int byte) {
|
|
return byte > 31 && byte < 128 && _Const.SEPARATORS.indexOf(byte) == -1;
|
|
}
|
|
|
|
List<String> _tokenizeFieldValue(String headerValue) {
|
|
List<String> tokens = new List<String>();
|
|
int start = 0;
|
|
int index = 0;
|
|
while (index < headerValue.length) {
|
|
if (headerValue[index] == ",") {
|
|
tokens.add(headerValue.substring(start, index));
|
|
start = index + 1;
|
|
} else if (headerValue[index] == " " || headerValue[index] == "\t") {
|
|
start++;
|
|
}
|
|
index++;
|
|
}
|
|
tokens.add(headerValue.substring(start, index));
|
|
return tokens;
|
|
}
|
|
|
|
int _toLowerCase(int byte) {
|
|
final int aCode = "A".charCodeAt(0);
|
|
final int zCode = "Z".charCodeAt(0);
|
|
final int delta = "a".charCodeAt(0) - aCode;
|
|
return (aCode <= byte && byte <= zCode) ? byte + delta : byte;
|
|
}
|
|
|
|
int _expect(int val1, int val2) {
|
|
if (val1 != val2) {
|
|
throw new HttpParserException("Failed to parse HTTP");
|
|
}
|
|
}
|
|
|
|
int _expectHexDigit(int byte) {
|
|
if (0x30 <= byte && byte <= 0x39) {
|
|
return byte - 0x30; // 0 - 9
|
|
} else if (0x41 <= byte && byte <= 0x46) {
|
|
return byte - 0x41 + 10; // A - F
|
|
} else if (0x61 <= byte && byte <= 0x66) {
|
|
return byte - 0x61 + 10; // a - f
|
|
} else {
|
|
throw new HttpParserException("Failed to parse HTTP");
|
|
}
|
|
}
|
|
|
|
int _state;
|
|
int _httpVersionIndex;
|
|
int _messageType;
|
|
StringBuffer _method_or_status_code;
|
|
StringBuffer _uri_or_reason_phrase;
|
|
StringBuffer _headerField;
|
|
StringBuffer _headerValue;
|
|
|
|
int _httpVersion;
|
|
int _contentLength;
|
|
bool _persistentConnection;
|
|
bool _connectionUpgrade;
|
|
bool _chunked;
|
|
|
|
bool _noMessageBody;
|
|
String _responseToMethod; // Indicates the method used for the request.
|
|
int _remainingContent;
|
|
|
|
List<int> _unparsedData; // Unparsed data after connection upgrade.
|
|
// Callbacks.
|
|
Function requestStart;
|
|
Function responseStart;
|
|
Function headerReceived;
|
|
Function headersComplete;
|
|
Function dataReceived;
|
|
Function dataEnd;
|
|
Function error;
|
|
}
|
|
|
|
|
|
class HttpParserException implements Exception {
|
|
const HttpParserException([String this.message = ""]);
|
|
String toString() => "HttpParserException: $message";
|
|
final String message;
|
|
}
|