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#include "ug_http_client.h"
#include "moses/Util.h"
#include <iostream>
namespace Moses
{
using boost::asio::ip::tcp;
std::string http_client::content() const { return m_content.str(); }
http_client::
http_client(boost::asio::io_service& io_service,
std::string const& server,
std::string const& port,
std::string const& path)
: resolver_(io_service), socket_(io_service)
{
init(server, port, path);
}
http_client::
http_client(boost::asio::io_service& io_service, std::string url, std::ostream* log)
: resolver_(io_service), socket_(io_service)
{
std::string server;
std::string path = "/";
std::string port = "http";
size_t p = url.find("://"), q;
if (p < url.size())
{
port = url.substr(0,p);
url.erase(0, p+3);
}
p = std::min(url.find_first_of(":/"), url.size());
q = std::min(url.find("/"), url.size());
if (p < url.size() && url[p] == ':')
port = url.substr(p+1,q-p-1);
server = url.substr(0,p);
if (q < url.size())
path = url.substr(q);
#if 1
if (log)
{
*log << HERE << std::endl;
// *log << "URL " << url << std::endl;
*log << "SERVER " << server << std::endl;
*log << "PORT " << port << "" << std::endl;
*log << "PATH " << path << std::endl;
}
#endif
init(server, port, path);
}
void
http_client::
init(std::string const& server, std::string const& port, std::string const& path)
{
// Form the request. We specify the "Connection: close" header so
// that the server will close the socket after transmitting the
// response. This will allow us to treat all data up until the EOF
// as the content.
std::ostream request_stream(&request_);
request_stream << "GET " << path << " HTTP/1.0\r\n";
request_stream << "Host: " << server << "\r\n";
request_stream << "Accept: */*\r\n";
request_stream << "Connection: close\r\n\r\n";
// Start an asynchronous resolve to translate the server and service names
// into a list of endpoints.
tcp::resolver::query query(server, port.c_str());
resolver_.async_resolve(query,
boost::bind(&http_client::handle_resolve, this,
boost::asio::placeholders::error,
boost::asio::placeholders::iterator));
}
void
http_client::
handle_resolve(const boost::system::error_code& err,
tcp::resolver::iterator endpoint_iterator)
{
if (!err)
{
// Attempt a connection to the first endpoint in the list. Each endpoint
// will be tried until we successfully establish a connection.
tcp::endpoint endpoint = *endpoint_iterator;
socket_.async_connect(endpoint,
boost::bind(&http_client::handle_connect, this,
boost::asio::placeholders::error, ++endpoint_iterator));
}
else
{
m_error << "Error: " << err.message() << "\n";
}
}
void
http_client::
handle_connect(const boost::system::error_code& err,
tcp::resolver::iterator endpoint_iterator)
{
if (!err)
{
// The connection was successful. Send the request.
boost::asio::async_write(socket_, request_,
boost::bind(&http_client::handle_write_request, this,
boost::asio::placeholders::error));
}
else if (endpoint_iterator != tcp::resolver::iterator())
{
// The connection failed. Try the next endpoint in the list.
socket_.close();
tcp::endpoint endpoint = *endpoint_iterator;
socket_.async_connect(endpoint,
boost::bind(&http_client::handle_connect, this,
boost::asio::placeholders::error, ++endpoint_iterator));
}
else m_error << "Error: " << err.message() << "\n";
}
void
http_client::
handle_write_request(const boost::system::error_code& err)
{
using namespace boost::asio;
if (err) { m_error << "Error: " << err.message() << "\n"; return; }
// Read the response status line. The response_ streambuf will
// automatically grow to accommodate the entire line. The growth may be
// limited by passing a maximum size to the streambuf constructor.
async_read_until(socket_, response_, "\r\n",
boost::bind(&http_client::handle_read_status_line,
this, placeholders::error));
}
void
http_client::
handle_read_status_line(const boost::system::error_code& err)
{
if (err) { m_error << "Error: " << err << "\n"; return; }
using namespace boost::asio;
// Check that response is OK.
std::istream response_stream(&response_);
response_stream >> m_http_version >> m_status_code;
std::getline(response_stream, m_status_message);
if (!response_stream || m_http_version.substr(0, 5) != "HTTP/")
m_error << "Invalid response\n";
else if (m_status_code != 200)
m_error << "Response returned with status code " << m_status_code << "\n";
else // Read the response headers, which are terminated by a blank line.
async_read_until(socket_, response_, "\r\n\r\n",
boost::bind(&http_client::handle_read_headers, this,
placeholders::error));
}
void
http_client::
handle_read_headers(const boost::system::error_code& err)
{
if (err) { m_error << "Error: " << err << "\n"; return; }
// Process the response headers.
std::istream response_stream(&response_);
std::string line;
while (std::getline(response_stream, line) && line != "\r")
m_header.push_back(line);
// Write whatever content we already have to output.
if (response_.size() > 0)
m_content << &response_;
using namespace boost::asio;
// Start reading remaining data until EOF.
async_read(socket_, response_, transfer_at_least(1),
boost::bind(&http_client::handle_read_content, this,
placeholders::error));
}
void
http_client::
handle_read_content(const boost::system::error_code& err)
{
using namespace boost::asio;
if(!err)
{
// Write all of the data that has been read so far.
// Then continue reading remaining data until EOF.
m_content << &response_;
async_read(socket_, response_, transfer_at_least(1),
boost::bind(&http_client::handle_read_content, this,
placeholders::error));
}
else if (err != boost::asio::error::eof)
{
m_error << "Error: " << err << "\n";
}
}
std::string
uri_encode(std::string const& in)
{
char buf[3 * in.size() + 1];
size_t i = 0;
for (unsigned char const* c = (unsigned char const*)in.c_str(); *c; ++c)
{
// cout << *c << " " << int(*c) << endl;
if (*c == ' ') buf[i++] = '+';
else if (*c == '.' || *c == '~' || *c == '_' || *c == '-') buf[i++] = *c;
else if (*c < '0') i += sprintf(buf+i, "%%%02x", int(*c));
else if (*c <= '9') buf[i++] = *c;
else if (*c < 'A') i += sprintf(buf+i, "%%%02x", int(*c));
else if (*c <= 'Z') buf[i++] = *c;
else if (*c < 'a') i += sprintf(buf+i, "%%%02x", int(*c));
else if (*c <= 'z') buf[i++] = *c;
else i += sprintf(buf+i, "%%%x", int(*c));
}
buf[i] = 0;
return std::string(buf);
}
}
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