async_web_server_cpp: http_reply.cpp Source File

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 //
 // http_reply.hpp
 // ~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2011 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 "async_web_server_cpp/http_reply.hpp"
  
 #include <boost/algorithm/string.hpp>
 #include <boost/lexical_cast.hpp>
  
 #include <fstream>
  
 namespace async_web_server_cpp
 {
  
 namespace status_strings
 {
  
 const std::string switching_protocols = "HTTP/1.1 101 Switching Protocols\r\n";
 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(HttpReply::status_type status)
 {
     switch (status)
     {
         case HttpReply::switching_protocols:
             return boost::asio::buffer(switching_protocols);
         case HttpReply::ok:
             return boost::asio::buffer(ok);
         case HttpReply::created:
             return boost::asio::buffer(created);
         case HttpReply::accepted:
             return boost::asio::buffer(accepted);
         case HttpReply::no_content:
             return boost::asio::buffer(no_content);
         case HttpReply::multiple_choices:
             return boost::asio::buffer(multiple_choices);
         case HttpReply::moved_permanently:
             return boost::asio::buffer(moved_permanently);
         case HttpReply::moved_temporarily:
             return boost::asio::buffer(moved_temporarily);
         case HttpReply::not_modified:
             return boost::asio::buffer(not_modified);
         case HttpReply::bad_request:
             return boost::asio::buffer(bad_request);
         case HttpReply::unauthorized:
             return boost::asio::buffer(unauthorized);
         case HttpReply::forbidden:
             return boost::asio::buffer(forbidden);
         case HttpReply::not_found:
             return boost::asio::buffer(not_found);
         case HttpReply::internal_server_error:
             return boost::asio::buffer(internal_server_error);
         case HttpReply::not_implemented:
             return boost::asio::buffer(not_implemented);
         case HttpReply::bad_gateway:
             return boost::asio::buffer(bad_gateway);
         case HttpReply::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
  
 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(HttpReply::status_type status)
 {
     switch (status)
     {
         case HttpReply::ok:
             return ok;
         case HttpReply::created:
             return created;
         case HttpReply::accepted:
             return accepted;
         case HttpReply::no_content:
             return no_content;
         case HttpReply::multiple_choices:
             return multiple_choices;
         case HttpReply::moved_permanently:
             return moved_permanently;
         case HttpReply::moved_temporarily:
             return moved_temporarily;
         case HttpReply::not_modified:
             return not_modified;
         case HttpReply::bad_request:
             return bad_request;
         case HttpReply::unauthorized:
             return unauthorized;
         case HttpReply::forbidden:
             return forbidden;
         case HttpReply::not_found:
             return not_found;
         case HttpReply::internal_server_error:
             return internal_server_error;
         case HttpReply::not_implemented:
             return not_implemented;
         case HttpReply::bad_gateway:
             return bad_gateway;
         case HttpReply::service_unavailable:
             return service_unavailable;
         default:
             return internal_server_error;
     }
 }
  
 }  // namespace stock_replies
  
 std::vector<boost::asio::const_buffer>
 HttpReply::to_buffers(const std::vector<HttpHeader>& headers)
 {
     std::vector<boost::asio::const_buffer> buffers;
     for (std::size_t i = 0; i < headers.size(); ++i)
     {
         const HttpHeader& 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));
     return buffers;
 }
  
 HttpServerRequestHandler
 HttpReply::from_file(HttpReply::status_type status,
                      const std::string& content_type,
                      const std::string& filename,
                      const std::vector<HttpHeader>& additional_headers)
 {
     std::vector<HttpHeader> headers;
     headers.push_back(HttpHeader("Content-Type", content_type));
     std::copy(additional_headers.begin(), additional_headers.end(),
               headers.begin());
  
     return FileHttpRequestHandler(status, filename, headers);
 }
 FileHttpRequestHandler::FileHttpRequestHandler(
     HttpReply::status_type status, const std::string& filename,
     const std::vector<HttpHeader>& headers)
     : status_(status), headers_(headers), filename_(filename)
 {
 }
  
 static bool hasContentType(const std::vector<HttpHeader>& headers)
 {
     for (const auto& h : headers)
     {
         if (boost::iequals(h.name, "content-type"))
             return true;
     }
     return false;
 }
  
 static std::string sniffContentType(const std::string& filename)
 {
     if (boost::algorithm::ends_with(filename, ".js"))
         return "application/javascript";
     if (boost::algorithm::ends_with(filename, ".htm"))
         return "text/html";
     if (boost::algorithm::ends_with(filename, ".html"))
         return "text/html";
     if (boost::algorithm::ends_with(filename, ".css"))
         return "text/css";
     if (boost::algorithm::ends_with(filename, ".png"))
         return "image/png";
     if (boost::algorithm::ends_with(filename, ".jpg"))
         return "image/jpeg";
     if (boost::algorithm::ends_with(filename, ".jpeg"))
         return "image/jpeg";
     if (boost::algorithm::ends_with(filename, ".gif"))
         return "image/gif";
     return "application/octet-stream";
 }
  
 static bool serveFromFile(HttpReply::status_type status,
                           const std::string& filename,
                           const std::vector<HttpHeader>& headers,
                           boost::shared_ptr<HttpConnection> connection)
 {
     std::ifstream file_stream(filename.c_str());
     std::stringstream file_buffer;
     file_buffer << file_stream.rdbuf();
     std::string content = file_buffer.str();
  
     ReplyBuilder reply_builder_(status);
     reply_builder_.headers(headers);
     if (!hasContentType(headers))
         reply_builder_.header("Content-Type", sniffContentType(filename));
     reply_builder_.header("Content-Length",
                           boost::lexical_cast<std::string>(content.size()));
     reply_builder_.write(connection);
     connection->write(content);
     return true;
 }
 bool FileHttpRequestHandler::operator()(
     const HttpRequest& request, boost::shared_ptr<HttpConnection> connection,
     const char* begin, const char* end)
 {
     return serveFromFile(status_, filename_, headers_, connection);
 }
  
 HttpServerRequestHandler HttpReply::from_filesystem(
     HttpReply::status_type status, const std::string& path_root,
     const std::string& filesystem_root, bool list_directories,
     const std::vector<HttpHeader>& additional_headers)
 {
     return FilesystemHttpRequestHandler(status, path_root, filesystem_root,
                                         list_directories, additional_headers);
 }
 FilesystemHttpRequestHandler::FilesystemHttpRequestHandler(
     HttpReply::status_type status, const std::string& path_root,
     const std::string& filesystem_root, bool list_directories,
     const std::vector<HttpHeader>& headers)
     : status_(status), headers_(headers), path_root_(path_root),
       filesystem_root_(filesystem_root), list_directories_(list_directories)
 {
 }
  
 bool FilesystemHttpRequestHandler::operator()(
     const HttpRequest& request, boost::shared_ptr<HttpConnection> connection,
     const char* begin, const char* end)
 {
     if (request.path.find(path_root_) == 0)
     {  // request.path startswith path_root
         std::string rel_path = request.path.substr(path_root_.length());
         if (rel_path.find_first_of('/') == 0)
         {  // remove leading slash to make path relative
             rel_path = rel_path.substr(1);
         }
  
         boost::filesystem::path requested_path = filesystem_root_ / rel_path;
  
         if (boost::filesystem::exists(requested_path))
         {
             if (boost::filesystem::is_directory(requested_path))
             {
                 if (list_directories_)
                 {
                     std::stringstream content;
                     content << "<html><body>";
                     content << "<h1> Directory Listing: " << request.path
                             << "</h1>";
                     boost::filesystem::directory_iterator end_itr;
                     for (boost::filesystem::directory_iterator itr(
                              requested_path);
                          itr != end_itr; ++itr)
                     {
                         if (boost::filesystem::is_directory(itr->status()))
                         {
                             content << "<a href=\""
                                     << itr->path().leaf().generic_string()
                                     << "/\">";
                             content << itr->path().leaf().generic_string()
                                     << "/";
                             content << "</a>";
                         }
                         else if (boost::filesystem::is_regular_file(
                                      itr->status()))
                         {
                             content << "<a href=\""
                                     << itr->path().leaf().generic_string()
                                     << "\">";
                             content << itr->path().leaf().generic_string();
                             content << "</a>";
                         }
                         content << "<br>";
                     }
                     content << "</body></html>";
                     HttpReply::static_reply(HttpReply::ok, "text/html",
                                             content.str(), headers_)(
                         request, connection, begin, end);
                 }
                 else
                 {
                     HttpReply::stock_reply(HttpReply::forbidden)(
                         request, connection, begin, end);
                 }
                 return true;
             }
             else if (boost::filesystem::is_regular_file(requested_path))
             {
                 serveFromFile(status_, requested_path.generic_string(),
                               headers_, connection);
                 return true;
             }
             else
             {
             }
         }
         else
         {
             return false;
         }
     }
     return false;
 }
  
 HttpServerRequestHandler HttpReply::stock_reply(HttpReply::status_type status)
 {
     return static_reply(status, "text/html", stock_replies::to_string(status));
 }
  
 HttpServerRequestHandler
 HttpReply::static_reply(HttpReply::status_type status,
                         const std::string& content_type,
                         const std::string& content,
                         const std::vector<HttpHeader>& additional_headers)
 {
     std::vector<HttpHeader> headers;
     headers.push_back(HttpHeader(
         "Content-Length", boost::lexical_cast<std::string>(content.size())));
     headers.push_back(HttpHeader("Content-Type", content_type));
     std::copy(additional_headers.begin(), additional_headers.end(),
               headers.begin());
     return StaticHttpRequestHandler(status, headers, content);
 }
  
 StaticHttpRequestHandler::StaticHttpRequestHandler(
     HttpReply::status_type status, const std::vector<HttpHeader>& headers,
     const std::string& content)
     : reply_builder_(status), content_string_(content)
 {
     reply_builder_.headers(headers);
 }
  
 bool StaticHttpRequestHandler::operator()(
     const HttpRequest& request, boost::shared_ptr<HttpConnection> connection,
     const char* begin, const char* end)
 {
     reply_builder_.write(connection);
     connection->write(content_string_);
     return true;
 }
  
 ReplyBuilder HttpReply::builder(HttpReply::status_type status)
 {
     return ReplyBuilder(status);
 }
  
 ReplyBuilder::ReplyBuilder(HttpReply::status_type status)
     : status_(status), headers_(new std::vector<HttpHeader>())
 {
 }
  
 ReplyBuilder& ReplyBuilder::header(const std::string& name,
                                    const std::string& value)
 {
     return header(HttpHeader(name, value));
 }
  
 ReplyBuilder& ReplyBuilder::header(const HttpHeader& header)
 {
     headers_->push_back(header);
     return *this;
 }
  
 ReplyBuilder& ReplyBuilder::headers(const std::vector<HttpHeader>& headers)
 {
     headers_->insert(headers_->end(), headers.begin(), headers.end());
     return *this;
 }
  
 void ReplyBuilder::write(HttpConnectionPtr connection)
 {
     connection->write(status_strings::to_buffer(status_),
                       HttpConnection::ResourcePtr());
     connection->write(HttpReply::to_buffers(*headers_), headers_);
 }
  
 }  // namespace async_web_server_cpp