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#pragma once
#include <string>
#include <unordered_map>
#include <boost/algorithm/string.hpp>
#include <boost/tokenizer.hpp>
#include <algorithm>
#include "http_request.h"
namespace crow
{
template <typename Handler>
struct HTTPParser : public http_parser
{
template<const char delimiter>
struct tokenize_by_char
{
template<typename It>
bool operator()(It& next, It end, std::string & tok)
{
if (next == end)
return false;
const char dels = delimiter;
const char* del = &dels;
auto pos = std::search(next, end, del, del + 1);
tok.assign(next, pos);
next = pos;
if (next != end)
std::advance(next, 1);
return true;
}
void reset() {}
};
static ci_map get_url_params(std::string url)
{
const char url_delimiter = '&';
const char param_delimiter = '=';
ci_map ret;
int qMarkPos = url.find("?");
if(!(qMarkPos >=0 && qMarkPos != (url.length()-1))) {
return ret;
}
auto params = url.substr(qMarkPos+1);
// substitute ';' for '&' for recommended process of delimintation
// (http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.2.2)
std::replace(params.begin(), params.end(), ';', url_delimiter);
// url tokenizer
for (auto i : boost::tokenizer<tokenize_by_char<url_delimiter>>(params)) {
std::string key, value;
auto parts = boost::tokenizer<tokenize_by_char<param_delimiter>>(i);
int count = 0;
for(auto p = parts.begin(); p != parts.end(); ++p, ++count) {
if(count == 0){
key = *p;
} else {
value = *p;
}
}
ret.insert(std::make_pair(key, value));
}
return ret;
}
static int on_message_begin(http_parser* self_)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
self->clear();
return 0;
}
static int on_url(http_parser* self_, const char* at, size_t length)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
self->url.insert(self->url.end(), at, at+length);
// url params
self->url_params = get_url_params(self->url);
return 0;
}
static int on_header_field(http_parser* self_, const char* at, size_t length)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
switch (self->header_building_state)
{
case 0:
if (!self->header_value.empty())
{
self->headers.emplace(std::move(self->header_field), std::move(self->header_value));
}
self->header_field.assign(at, at+length);
self->header_building_state = 1;
break;
case 1:
self->header_field.insert(self->header_field.end(), at, at+length);
break;
}
return 0;
}
static int on_header_value(http_parser* self_, const char* at, size_t length)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
switch (self->header_building_state)
{
case 0:
self->header_value.insert(self->header_value.end(), at, at+length);
break;
case 1:
self->header_building_state = 0;
self->header_value.assign(at, at+length);
break;
}
return 0;
}
static int on_headers_complete(http_parser* self_)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
if (!self->header_field.empty())
{
self->headers.emplace(std::move(self->header_field), std::move(self->header_value));
}
self->process_header();
return 0;
}
static int on_body(http_parser* self_, const char* at, size_t length)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
self->body.insert(self->body.end(), at, at+length);
return 0;
}
static int on_message_complete(http_parser* self_)
{
HTTPParser* self = static_cast<HTTPParser*>(self_);
self->process_message();
return 0;
}
HTTPParser(Handler* handler) :
handler_(handler)
{
http_parser_init(this, HTTP_REQUEST);
}
// return false on error
bool feed(const char* buffer, int length)
{
const static http_parser_settings settings_{
on_message_begin,
on_url,
nullptr,
on_header_field,
on_header_value,
on_headers_complete,
on_body,
on_message_complete,
};
int nparsed = http_parser_execute(this, &settings_, buffer, length);
return nparsed == length;
}
bool done()
{
return feed(nullptr, 0);
}
void clear()
{
url.clear();
header_building_state = 0;
header_field.clear();
header_value.clear();
headers.clear();
url_params.clear();
body.clear();
}
void process_header()
{
handler_->handle_header();
}
void process_message()
{
handler_->handle();
}
request to_request() const
{
return request{(HTTPMethod)method, std::move(url), std::move(url_params), std::move(headers), std::move(body)};
}
bool check_version(int major, int minor) const
{
return http_major == major && http_minor == minor;
}
std::string url;
int header_building_state = 0;
std::string header_field;
std::string header_value;
ci_map headers;
ci_map url_params;
std::string body;
Handler* handler_;
};
}
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