add basic http server (using boost.asio example)

Change-Id: I02bbc161ec7f89ade999b92ed99ef71fec83af32
diff --git a/server/reply.cpp b/server/reply.cpp
new file mode 100644
index 0000000..044951d
--- /dev/null
+++ b/server/reply.cpp
@@ -0,0 +1,256 @@
+//
+// reply.cpp
+// ~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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 "reply.hpp"
+#include <string>
+#include <boost/lexical_cast.hpp>
+
+namespace http {
+namespace server {
+
+namespace status_strings {
+
+const std::string ok =
+  "HTTP/1.0 200 OK\r\n";
+const std::string created =
+  "HTTP/1.0 201 Created\r\n";
+const std::string accepted =
+  "HTTP/1.0 202 Accepted\r\n";
+const std::string no_content =
+  "HTTP/1.0 204 No Content\r\n";
+const std::string multiple_choices =
+  "HTTP/1.0 300 Multiple Choices\r\n";
+const std::string moved_permanently =
+  "HTTP/1.0 301 Moved Permanently\r\n";
+const std::string moved_temporarily =
+  "HTTP/1.0 302 Moved Temporarily\r\n";
+const std::string not_modified =
+  "HTTP/1.0 304 Not Modified\r\n";
+const std::string bad_request =
+  "HTTP/1.0 400 Bad Request\r\n";
+const std::string unauthorized =
+  "HTTP/1.0 401 Unauthorized\r\n";
+const std::string forbidden =
+  "HTTP/1.0 403 Forbidden\r\n";
+const std::string not_found =
+  "HTTP/1.0 404 Not Found\r\n";
+const std::string internal_server_error =
+  "HTTP/1.0 500 Internal Server Error\r\n";
+const std::string not_implemented =
+  "HTTP/1.0 501 Not Implemented\r\n";
+const std::string bad_gateway =
+  "HTTP/1.0 502 Bad Gateway\r\n";
+const std::string service_unavailable =
+  "HTTP/1.0 503 Service Unavailable\r\n";
+
+boost::asio::const_buffer to_buffer(reply::status_type status)
+{
+  switch (status)
+  {
+  case reply::ok:
+    return boost::asio::buffer(ok);
+  case reply::created:
+    return boost::asio::buffer(created);
+  case reply::accepted:
+    return boost::asio::buffer(accepted);
+  case reply::no_content:
+    return boost::asio::buffer(no_content);
+  case reply::multiple_choices:
+    return boost::asio::buffer(multiple_choices);
+  case reply::moved_permanently:
+    return boost::asio::buffer(moved_permanently);
+  case reply::moved_temporarily:
+    return boost::asio::buffer(moved_temporarily);
+  case reply::not_modified:
+    return boost::asio::buffer(not_modified);
+  case reply::bad_request:
+    return boost::asio::buffer(bad_request);
+  case reply::unauthorized:
+    return boost::asio::buffer(unauthorized);
+  case reply::forbidden:
+    return boost::asio::buffer(forbidden);
+  case reply::not_found:
+    return boost::asio::buffer(not_found);
+  case reply::internal_server_error:
+    return boost::asio::buffer(internal_server_error);
+  case reply::not_implemented:
+    return boost::asio::buffer(not_implemented);
+  case reply::bad_gateway:
+    return boost::asio::buffer(bad_gateway);
+  case reply::service_unavailable:
+    return boost::asio::buffer(service_unavailable);
+  default:
+    return boost::asio::buffer(internal_server_error);
+  }
+}
+
+} // namespace status_strings
+
+namespace misc_strings {
+
+const char name_value_separator[] = { ':', ' ' };
+const char crlf[] = { '\r', '\n' };
+
+} // namespace misc_strings
+
+std::vector<boost::asio::const_buffer> reply::to_buffers()
+{
+  std::vector<boost::asio::const_buffer> buffers;
+  buffers.push_back(status_strings::to_buffer(status));
+  for (std::size_t i = 0; i < headers.size(); ++i)
+  {
+    header& h = headers[i];
+    buffers.push_back(boost::asio::buffer(h.name));
+    buffers.push_back(boost::asio::buffer(misc_strings::name_value_separator));
+    buffers.push_back(boost::asio::buffer(h.value));
+    buffers.push_back(boost::asio::buffer(misc_strings::crlf));
+  }
+  buffers.push_back(boost::asio::buffer(misc_strings::crlf));
+  buffers.push_back(boost::asio::buffer(content));
+  return buffers;
+}
+
+namespace stock_replies {
+
+const char ok[] = "";
+const char created[] =
+  "<html>"
+  "<head><title>Created</title></head>"
+  "<body><h1>201 Created</h1></body>"
+  "</html>";
+const char accepted[] =
+  "<html>"
+  "<head><title>Accepted</title></head>"
+  "<body><h1>202 Accepted</h1></body>"
+  "</html>";
+const char no_content[] =
+  "<html>"
+  "<head><title>No Content</title></head>"
+  "<body><h1>204 Content</h1></body>"
+  "</html>";
+const char multiple_choices[] =
+  "<html>"
+  "<head><title>Multiple Choices</title></head>"
+  "<body><h1>300 Multiple Choices</h1></body>"
+  "</html>";
+const char moved_permanently[] =
+  "<html>"
+  "<head><title>Moved Permanently</title></head>"
+  "<body><h1>301 Moved Permanently</h1></body>"
+  "</html>";
+const char moved_temporarily[] =
+  "<html>"
+  "<head><title>Moved Temporarily</title></head>"
+  "<body><h1>302 Moved Temporarily</h1></body>"
+  "</html>";
+const char not_modified[] =
+  "<html>"
+  "<head><title>Not Modified</title></head>"
+  "<body><h1>304 Not Modified</h1></body>"
+  "</html>";
+const char bad_request[] =
+  "<html>"
+  "<head><title>Bad Request</title></head>"
+  "<body><h1>400 Bad Request</h1></body>"
+  "</html>";
+const char unauthorized[] =
+  "<html>"
+  "<head><title>Unauthorized</title></head>"
+  "<body><h1>401 Unauthorized</h1></body>"
+  "</html>";
+const char forbidden[] =
+  "<html>"
+  "<head><title>Forbidden</title></head>"
+  "<body><h1>403 Forbidden</h1></body>"
+  "</html>";
+const char not_found[] =
+  "<html>"
+  "<head><title>Not Found</title></head>"
+  "<body><h1>404 Not Found</h1></body>"
+  "</html>";
+const char internal_server_error[] =
+  "<html>"
+  "<head><title>Internal Server Error</title></head>"
+  "<body><h1>500 Internal Server Error</h1></body>"
+  "</html>";
+const char not_implemented[] =
+  "<html>"
+  "<head><title>Not Implemented</title></head>"
+  "<body><h1>501 Not Implemented</h1></body>"
+  "</html>";
+const char bad_gateway[] =
+  "<html>"
+  "<head><title>Bad Gateway</title></head>"
+  "<body><h1>502 Bad Gateway</h1></body>"
+  "</html>";
+const char service_unavailable[] =
+  "<html>"
+  "<head><title>Service Unavailable</title></head>"
+  "<body><h1>503 Service Unavailable</h1></body>"
+  "</html>";
+
+std::string to_string(reply::status_type status)
+{
+  switch (status)
+  {
+  case reply::ok:
+    return ok;
+  case reply::created:
+    return created;
+  case reply::accepted:
+    return accepted;
+  case reply::no_content:
+    return no_content;
+  case reply::multiple_choices:
+    return multiple_choices;
+  case reply::moved_permanently:
+    return moved_permanently;
+  case reply::moved_temporarily:
+    return moved_temporarily;
+  case reply::not_modified:
+    return not_modified;
+  case reply::bad_request:
+    return bad_request;
+  case reply::unauthorized:
+    return unauthorized;
+  case reply::forbidden:
+    return forbidden;
+  case reply::not_found:
+    return not_found;
+  case reply::internal_server_error:
+    return internal_server_error;
+  case reply::not_implemented:
+    return not_implemented;
+  case reply::bad_gateway:
+    return bad_gateway;
+  case reply::service_unavailable:
+    return service_unavailable;
+  default:
+    return internal_server_error;
+  }
+}
+
+} // namespace stock_replies
+
+reply reply::stock_reply(reply::status_type status)
+{
+  reply rep;
+  rep.status = status;
+  rep.content = stock_replies::to_string(status);
+  rep.headers.resize(2);
+  rep.headers[0].name = "Content-Length";
+  rep.headers[0].value = boost::lexical_cast<std::string>(rep.content.size());
+  rep.headers[1].name = "Content-Type";
+  rep.headers[1].value = "text/html";
+  return rep;
+}
+
+} // namespace server
+} // namespace http