/*
open source routing machine
Copyright (C) Dennis Luxen, 2010
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU AFFERO General Public License as published by
the Free Software Foundation; either version 3 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
or see http://www.gnu.org/licenses/agpl.txt.
*/
#ifndef REQUEST_PARSER_H
#define REQUEST_PARSER_H
#include <boost/logic/tribool.hpp>
#include <boost/tuple/tuple.hpp>
#include "BasicDatastructures.h"
namespace http {
class RequestParser {
public:
RequestParser() : state_(method_start) { }
void Reset() { state_ = method_start; }
boost::tuple<boost::tribool, char*> Parse(Request& req, char* begin, char* end, CompressionType * compressionType) {
while (begin != end) {
boost::tribool result = consume(req, *begin++, compressionType);
if (result || !result){
return boost::make_tuple(result, begin);
}
}
boost::tribool result = boost::indeterminate;
return boost::make_tuple(result, begin);
}
private:
boost::tribool consume(Request& req, char input, CompressionType * compressionType) {
switch (state_) {
case method_start:
if (!isChar(input) || isCTL(input) || isTSpecial(input)) {
return false;
} else {
state_ = method;
return boost::indeterminate;
}
case method:
if (input == ' ') {
state_ = uri;
return boost::indeterminate;
} else if (!isChar(input) || isCTL(input) || isTSpecial(input)) {
return false;
} else {
return boost::indeterminate;
}
case uri_start:
if (isCTL(input)) {
return false;
} else {
state_ = uri;
req.uri.push_back(input);
return boost::indeterminate;
}
case uri:
if (input == ' ') {
state_ = http_version_h;
return boost::indeterminate;
} else if (isCTL(input)) {
return false;
} else {
req.uri.push_back(input);
return boost::indeterminate;
}
case http_version_h:
if (input == 'H') {
state_ = http_version_t_1;
return boost::indeterminate;
} else {
return false;
}
case http_version_t_1:
if (input == 'T') {
state_ = http_version_t_2;
return boost::indeterminate;
} else {
return false;
}
case http_version_t_2:
if (input == 'T') {
state_ = http_version_p;
return boost::indeterminate;
} else {
return false;
}
case http_version_p:
if (input == 'P') {
state_ = http_version_slash;
return boost::indeterminate;
} else {
return false;
}
case http_version_slash:
if (input == '/') {
state_ = http_version_major_start;
return boost::indeterminate;
} else {
return false;
}
case http_version_major_start:
if (isDigit(input)) {
state_ = http_version_major;
return boost::indeterminate;
} else {
return false;
}
case http_version_major:
if (input == '.') {
state_ = http_version_minor_start;
return boost::indeterminate;
} else if (isDigit(input)) {
return boost::indeterminate;
} else {
return false;
}
case http_version_minor_start:
if (isDigit(input)) {
state_ = http_version_minor;
return boost::indeterminate;
} else {
return false;
}
case http_version_minor:
if (input == '\r') {
state_ = expecting_newline_1;
return boost::indeterminate;
} else if (isDigit(input)) {
return boost::indeterminate;
}
else {
return false;
}
case expecting_newline_1:
if (input == '\n') {
state_ = header_line_start;
return boost::indeterminate;
} else {
return false;
}
case header_line_start:
if (input == '\r') {
state_ = expecting_newline_3;
return boost::indeterminate;
} else if (!isChar(input) || isCTL(input) || isTSpecial(input)) {
return false;
} else {
state_ = header_name;
if(header.name == "Accept-Encoding") {
/* giving gzip precedence over deflate */
if(header.value.find("deflate") != std::string::npos)
*compressionType = deflateRFC1951;
if(header.value.find("gzip") != std::string::npos)
*compressionType = gzipRFC1952;
}
header.Clear();
header.name.push_back(input);
return boost::indeterminate;
}
case header_lws:
if (input == '\r') {
state_ = expecting_newline_2;
return boost::indeterminate;
} else if (input == ' ' || input == '\t') {
return boost::indeterminate;
}
else if (isCTL(input)) {
return false;
} else {
state_ = header_value;
return boost::indeterminate;
}
case header_name:
if (input == ':') {
state_ = space_before_header_value;
return boost::indeterminate;
} else if (!isChar(input) || isCTL(input) || isTSpecial(input)) {
return false;
} else {
header.name.push_back(input);
return boost::indeterminate;
}
case space_before_header_value:
if (input == ' ') {
state_ = header_value;
return boost::indeterminate;
} else {
return false;
}
case header_value:
if (input == '\r') {
state_ = expecting_newline_2;
return boost::indeterminate;
} else if (isCTL(input)) {
return false;
} else {
header.value.push_back(input);
return boost::indeterminate;
}
case expecting_newline_2:
if (input == '\n') {
state_ = header_line_start;
return boost::indeterminate;
} else {
return false;
}
case expecting_newline_3:
return (input == '\n');
default:
return false;
}
}
inline bool isChar(int c) {
return c >= 0 && c <= 127;
}
inline bool isCTL(int c) {
return (c >= 0 && c <= 31) || (c == 127);
}
inline bool isTSpecial(int c) {
switch (c) {
case '(': case ')': case '<': case '>': case '@':
case ',': case ';': case ':': case '\\': case '"':
case '/': case '[': case ']': case '?': case '=':
case '{': case '}': case ' ': case '\t':
return true;
default:
return false;
}
}
inline bool isDigit(int c) {
return c >= '0' && c <= '9';
}
enum state {
method_start,
method,
uri_start,
uri,
http_version_h,
http_version_t_1,
http_version_t_2,
http_version_p,
http_version_slash,
http_version_major_start,
http_version_major,
http_version_minor_start,
http_version_minor,
expecting_newline_1,
header_line_start,
header_lws,
header_name,
space_before_header_value,
header_value,
expecting_newline_2,
expecting_newline_3
} state_;
Header header;
};
} // namespace http
#endif // REQUEST_PARSER_H