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/*
* Sketchy HTTP client
* (C) 2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/http_util.h>
#include <botan/parsing.h>
#include <botan/hex.h>
#include <sstream>
#if defined(BOTAN_HAS_BOOST_ASIO)
#include <boost/asio.hpp>
#endif
namespace Botan {
namespace HTTP {
#if defined(BOTAN_HAS_BOOST_ASIO)
std::string http_transact_asio(const std::string& hostname,
const std::string& message)
{
using namespace boost::asio::ip;
boost::asio::ip::tcp::iostream tcp;
tcp.connect(hostname, "http");
if(!tcp)
throw std::runtime_error("HTTP connection to " + hostname + " failed");
tcp << message;
tcp.flush();
std::ostringstream oss;
oss << tcp.rdbuf();
return oss.str();
}
#endif
std::string http_transact_fail(const std::string& hostname,
const std::string&)
{
throw std::runtime_error("Cannot connect to " + hostname +
": network code disabled in build");
}
std::string url_encode(const std::string& in)
{
std::ostringstream out;
for(auto c : in)
{
if(c >= 'A' && c <= 'Z')
out << c;
else if(c >= 'a' && c <= 'z')
out << c;
else if(c >= '0' && c <= '9')
out << c;
else if(c == '-' || c == '_' || c == '.' || c == '~')
out << c;
else
out << '%' << hex_encode(reinterpret_cast<byte*>(&c), 1);
}
return out.str();
}
std::ostream& operator<<(std::ostream& o, const Response& resp)
{
o << "HTTP " << resp.status_code() << " " << resp.status_message() << "\n";
for(auto h : resp.headers())
o << "Header '" << h.first << "' = '" << h.second << "'\n";
o << "Body " << std::to_string(resp.body().size()) << " bytes:\n";
o.write(reinterpret_cast<const char*>(&resp.body()[0]), resp.body().size());
return o;
}
Response http_sync(http_exch_fn http_transact,
const std::string& verb,
const std::string& url,
const std::string& content_type,
const std::vector<byte>& body,
size_t allowable_redirects)
{
const auto protocol_host_sep = url.find("://");
if(protocol_host_sep == std::string::npos)
throw std::runtime_error("Invalid URL " + url);
const std::string protocol = url.substr(0, protocol_host_sep);
const auto host_loc_sep = url.find('/', protocol_host_sep + 3);
std::string hostname, loc;
if(host_loc_sep == std::string::npos)
{
hostname = url.substr(protocol_host_sep + 3, std::string::npos);
loc = "/";
}
else
{
hostname = url.substr(protocol_host_sep + 3, host_loc_sep-protocol_host_sep-3);
loc = url.substr(host_loc_sep, std::string::npos);
}
std::ostringstream outbuf;
outbuf << verb << " " << loc << " HTTP/1.0\r\n";
outbuf << "Host: " << hostname << "\r\n";
if(verb == "GET")
{
outbuf << "Accept: */*\r\n";
outbuf << "Cache-Control: no-cache\r\n";
}
else if(verb == "POST")
outbuf << "Content-Length: " << body.size() << "\r\n";
if(content_type != "")
outbuf << "Content-Type: " << content_type << "\r\n";
outbuf << "Connection: close\r\n\r\n";
outbuf.write(reinterpret_cast<const char*>(&body[0]), body.size());
std::istringstream io(http_transact(hostname, outbuf.str()));
std::string line1;
std::getline(io, line1);
if(!io || line1.empty())
throw std::runtime_error("No response");
std::stringstream response_stream(line1);
std::string http_version;
unsigned int status_code;
std::string status_message;
response_stream >> http_version >> status_code;
std::getline(response_stream, status_message);
if(!response_stream || http_version.substr(0,5) != "HTTP/")
throw std::runtime_error("Not an HTTP response");
std::map<std::string, std::string> headers;
std::string header_line;
while (std::getline(io, header_line) && header_line != "\r")
{
auto sep = header_line.find(": ");
if(sep == std::string::npos || sep > header_line.size() - 2)
throw std::runtime_error("Invalid HTTP header " + header_line);
const std::string key = header_line.substr(0, sep);
if(sep + 2 < header_line.size() - 1)
{
const std::string val = header_line.substr(sep + 2, (header_line.size() - 1) - (sep + 2));
headers[key] = val;
}
}
if(status_code == 301 && headers.count("Location"))
{
if(allowable_redirects == 0)
throw std::runtime_error("HTTP redirection count exceeded");
return GET_sync(headers["Location"], allowable_redirects - 1);
}
// Use Content-Length if set
std::vector<byte> resp_body;
std::vector<byte> buf(4096);
while(io.good())
{
io.read(reinterpret_cast<char*>(&buf[0]), buf.size());
resp_body.insert(resp_body.end(), &buf[0], &buf[io.gcount()]);
}
return Response(status_code, status_message, resp_body, headers);
}
Response http_sync(const std::string& verb,
const std::string& url,
const std::string& content_type,
const std::vector<byte>& body,
size_t allowable_redirects)
{
return http_sync(
#if defined(BOTAN_HAS_BOOST_ASIO)
http_transact_asio,
#else
http_transact_fail,
#endif
verb,
url,
content_type,
body,
allowable_redirects);
}
Response GET_sync(const std::string& url, size_t allowable_redirects)
{
return http_sync("GET", url, "", std::vector<byte>(), allowable_redirects);
}
Response POST_sync(const std::string& url,
const std::string& content_type,
const std::vector<byte>& body,
size_t allowable_redirects)
{
return http_sync("POST", url, content_type, body, allowable_redirects);
}
std::future<Response> GET_async(const std::string& url, size_t allowable_redirects)
{
return std::async(std::launch::async, GET_sync, url, allowable_redirects);
}
}
}
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