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request_parser.cpp
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request_parser.cpp
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//
// request_parser.cpp
// ~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2010 Ivan Ribeiro Rocha (ivanribeiro at gmail dot com)
// 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include <algorithm>
#include <string>
#include "boost/lexical_cast.hpp"
#include "request_parser.hpp"
#include "request.hpp"
#define UPPER_CONTENT_LENGTH "CONTENT-LENGTH"
#define UPPER_CONTENT_TYPE "CONTENT-TYPE"
#define UPPER_MIME_TYPE "APPLICATION/X-WWW-FORM-URLENCODED"
namespace http {
namespace server3 {
request_parser::request_parser()
: state_(method_start), cl_(0)
{
}
void request_parser::reset()
{
state_ = method_start;
cl_ = 0;
}
boost::tribool request_parser::consume(request& req, char input)
{
switch (state_)
{
case method_start:
if (!is_char(input) || is_ctl(input) || is_tspecial(input))
{
return false;
}
else
{
state_ = method;
req.method.push_back(input);
return boost::indeterminate;
}
case method:
if (input == ' ')
{
state_ = uri;
return boost::indeterminate;
}
else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
{
return false;
}
else
{
req.method.push_back(input);
return boost::indeterminate;
}
case uri_start:
if (is_ctl(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 (is_ctl(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 == '/')
{
req.http_version_major = 0;
req.http_version_minor = 0;
state_ = http_version_major_start;
return boost::indeterminate;
}
else
{
return false;
}
case http_version_major_start:
if (is_digit(input))
{
req.http_version_major = req.http_version_major * 10 + input - '0';
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 (is_digit(input))
{
req.http_version_major = req.http_version_major * 10 + input - '0';
return boost::indeterminate;
}
else
{
return false;
}
case http_version_minor_start:
if (is_digit(input))
{
req.http_version_minor = req.http_version_minor * 10 + input - '0';
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 (is_digit(input))
{
req.http_version_minor = req.http_version_minor * 10 + input - '0';
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 (!req.headers.empty() && (input == ' ' || input == '\t'))
{
state_ = header_lws;
return boost::indeterminate;
}
else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
{
return false;
}
else
{
req.headers.push_back(header());
req.headers.back().name.push_back(input);
state_ = header_name;
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 (is_ctl(input))
{
return false;
}
else
{
state_ = header_value;
req.headers.back().value.push_back(input);
return boost::indeterminate;
}
case header_name:
if (input == ':')
{
state_ = space_before_header_value;
return boost::indeterminate;
}
else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
{
return false;
}
else
{
req.headers.back().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 (is_ctl(input))
{
return false;
}
else
{
req.headers.back().value.push_back(input);
return boost::indeterminate;
}
case expecting_newline_2:
if (input == '\n')
{
state_ = header_line_start;
std::vector<header>::const_iterator cit = req.headers.begin();
for (; cit != req.headers.end(); ++cit)
{
std::string n = (*cit).name;
std::transform(n.begin(), n.end(), n.begin(), ::toupper);
if (n == UPPER_CONTENT_LENGTH)
{
try
{
cl_ = boost::lexical_cast<int>((*cit).value);
}
catch (const boost::bad_lexical_cast& e)
{
return false;
}
}
else if (n == UPPER_CONTENT_TYPE)
{
std::string m = (*cit).value;
std::transform(m.begin(), m.end(), m.begin(), ::toupper);
if (m != UPPER_MIME_TYPE)
{
return false;
}
}
}
return boost::indeterminate;
}
else
{
return false;
}
case expecting_newline_3:
{
if (0 == cl_)
{
return (input == '\n');
}
else
{
state_ = post_data;
return boost::indeterminate;
}
}
case post_data:
{
req.post_data.push_back(input);
if (0 == --cl_)
return true;
else
return ((cl_ < 0) ? false : boost::indeterminate);
}
default:
return false;
}
}
bool request_parser::is_char(int c)
{
return c >= 0 && c <= 127;
}
bool request_parser::is_ctl(int c)
{
return (c >= 0 && c <= 31) || (c == 127);
}
bool request_parser::is_tspecial(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;
}
}
bool request_parser::is_digit(int c)
{
return c >= '0' && c <= '9';
}
} // namespace server3
} // namespace http