ceph/src/boost/libs/asio/example/cpp03/http/server3/request_handler.cpp

   1 //
   2 // request_handler.cpp
   3 // ~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #include "request_handler.hpp"
  12 #include <fstream>
  13 #include <sstream>
  14 #include <string>
  15 #include <boost/lexical_cast.hpp>
  16 #include "mime_types.hpp"
  17 #include "reply.hpp"
  18 #include "request.hpp"
  19
  20 namespace http {
  21 namespace server3 {
  22
  23 request_handler::request_handler(const std::string& doc_root)
  24   : doc_root_(doc_root)
  25 {
  26 }
  27
  28 void request_handler::handle_request(const request& req, reply& rep)
  29 {
  30   // Decode url to path.
  31   std::string request_path;
  32   if (!url_decode(req.uri, request_path))
  33   {
  34     rep = reply::stock_reply(reply::bad_request);
  35     return;
  36   }
  37
  38   // Request path must be absolute and not contain "..".
  39   if (request_path.empty() || request_path[0] != '/'
  40       || request_path.find("..") != std::string::npos)
  41   {
  42     rep = reply::stock_reply(reply::bad_request);
  43     return;
  44   }
  45
  46   // If path ends in slash (i.e. is a directory) then add "index.html".
  47   if (request_path[request_path.size() - 1] == '/')
  48   {
  49     request_path += "index.html";
  50   }
  51
  52   // Determine the file extension.
  53   std::size_t last_slash_pos = request_path.find_last_of("/");
  54   std::size_t last_dot_pos = request_path.find_last_of(".");
  55   std::string extension;
  56   if (last_dot_pos != std::string::npos && last_dot_pos > last_slash_pos)
  57   {
  58     extension = request_path.substr(last_dot_pos + 1);
  59   }
  60
  61   // Open the file to send back.
  62   std::string full_path = doc_root_ + request_path;
  63   std::ifstream is(full_path.c_str(), std::ios::in | std::ios::binary);
  64   if (!is)
  65   {
  66     rep = reply::stock_reply(reply::not_found);
  67     return;
  68   }
  69
  70   // Fill out the reply to be sent to the client.
  71   rep.status = reply::ok;
  72   char buf[512];
  73   while (is.read(buf, sizeof(buf)).gcount() > 0)
  74     rep.content.append(buf, is.gcount());
  75   rep.headers.resize(2);
  76   rep.headers[0].name = "Content-Length";
  77   rep.headers[0].value = boost::lexical_cast<std::string>(rep.content.size());
  78   rep.headers[1].name = "Content-Type";
  79   rep.headers[1].value = mime_types::extension_to_type(extension);
  80 }
  81
  82 bool request_handler::url_decode(const std::string& in, std::string& out)
  83 {
  84   out.clear();
  85   out.reserve(in.size());
  86   for (std::size_t i = 0; i < in.size(); ++i)
  87   {
  88     if (in[i] == '%')
  89     {
  90       if (i + 3 <= in.size())
  91       {
  92         int value = 0;
  93         std::istringstream is(in.substr(i + 1, 2));
  94         if (is >> std::hex >> value)
  95         {
  96           out += static_cast<char>(value);
  97           i += 2;
  98         }
  99         else
 100         {
 101           return false;
 102         }
 103       }
 104       else
 105       {
 106         return false;
 107       }
 108     }
 109     else if (in[i] == '+')
 110     {
 111       out += ' ';
 112     }
 113     else
 114     {
 115       out += in[i];
 116     }
 117   }
 118   return true;
 119 }
 120
 121 } // namespace server3
 122 } // namespace http