ceph/src/boost/libs/asio/example/cpp11/http/server/request_handler.cpp

   1 //
   2 // request_handler.cpp
   3 // ~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2017 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 "mime_types.hpp"
  16 #include "reply.hpp"
  17 #include "request.hpp"
  18
  19 namespace http {
  20 namespace server {
  21
  22 request_handler::request_handler(const std::string& doc_root)
  23   : doc_root_(doc_root)
  24 {
  25 }
  26
  27 void request_handler::handle_request(const request& req, reply& rep)
  28 {
  29   // Decode url to path.
  30   std::string request_path;
  31   if (!url_decode(req.uri, request_path))
  32   {
  33     rep = reply::stock_reply(reply::bad_request);
  34     return;
  35   }
  36
  37   // Request path must be absolute and not contain "..".
  38   if (request_path.empty() || request_path[0] != '/'
  39       || request_path.find("..") != std::string::npos)
  40   {
  41     rep = reply::stock_reply(reply::bad_request);
  42     return;
  43   }
  44
  45   // If path ends in slash (i.e. is a directory) then add "index.html".
  46   if (request_path[request_path.size() - 1] == '/')
  47   {
  48     request_path += "index.html";
  49   }
  50
  51   // Determine the file extension.
  52   std::size_t last_slash_pos = request_path.find_last_of("/");
  53   std::size_t last_dot_pos = request_path.find_last_of(".");
  54   std::string extension;
  55   if (last_dot_pos != std::string::npos && last_dot_pos > last_slash_pos)
  56   {
  57     extension = request_path.substr(last_dot_pos + 1);
  58   }
  59
  60   // Open the file to send back.
  61   std::string full_path = doc_root_ + request_path;
  62   std::ifstream is(full_path.c_str(), std::ios::in | std::ios::binary);
  63   if (!is)
  64   {
  65     rep = reply::stock_reply(reply::not_found);
  66     return;
  67   }
  68
  69   // Fill out the reply to be sent to the client.
  70   rep.status = reply::ok;
  71   char buf[512];
  72   while (is.read(buf, sizeof(buf)).gcount() > 0)
  73     rep.content.append(buf, is.gcount());
  74   rep.headers.resize(2);
  75   rep.headers[0].name = "Content-Length";
  76   rep.headers[0].value = std::to_string(rep.content.size());
  77   rep.headers[1].name = "Content-Type";
  78   rep.headers[1].value = mime_types::extension_to_type(extension);
  79 }
  80
  81 bool request_handler::url_decode(const std::string& in, std::string& out)
  82 {
  83   out.clear();
  84   out.reserve(in.size());
  85   for (std::size_t i = 0; i < in.size(); ++i)
  86   {
  87     if (in[i] == '%')
  88     {
  89       if (i + 3 <= in.size())
  90       {
  91         int value = 0;
  92         std::istringstream is(in.substr(i + 1, 2));
  93         if (is >> std::hex >> value)
  94         {
  95           out += static_cast<char>(value);
  96           i += 2;
  97         }
  98         else
  99         {
 100           return false;
 101         }
 102       }
 103       else
 104       {
 105         return false;
 106       }
 107     }
 108     else if (in[i] == '+')
 109     {
 110       out += ' ';
 111     }
 112     else
 113     {
 114       out += in[i];
 115     }
 116   }
 117   return true;
 118 }
 119
 120 } // namespace server
 121 } // namespace http