122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
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//
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// request_handler.cpp
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// ~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include "request_handler.hpp"
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#include <fstream>
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#include <sstream>
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#include <string>
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#include "mime_types.hpp"
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#include "reply.hpp"
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#include "request.hpp"
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namespace http {
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namespace server {
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request_handler::request_handler(const std::string& doc_root)
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: doc_root_(doc_root)
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{
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}
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void request_handler::handle_request(const request& req, reply& rep)
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{
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// Decode url to path.
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std::string request_path;
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if (!url_decode(req.uri, request_path))
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{
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rep = reply::stock_reply(reply::bad_request);
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return;
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}
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// Request path must be absolute and not contain "..".
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if (request_path.empty() || request_path[0] != '/'
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|| request_path.find("..") != std::string::npos)
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{
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rep = reply::stock_reply(reply::bad_request);
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return;
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}
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// If path ends in slash (i.e. is a directory) then add "index.html".
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if (request_path[request_path.size() - 1] == '/')
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{
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request_path += "index.html";
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}
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// Determine the file extension.
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std::size_t last_slash_pos = request_path.find_last_of("/");
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std::size_t last_dot_pos = request_path.find_last_of(".");
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std::string extension;
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if (last_dot_pos != std::string::npos && last_dot_pos > last_slash_pos)
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{
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extension = request_path.substr(last_dot_pos + 1);
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}
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// Open the file to send back.
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std::string full_path = doc_root_ + request_path;
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std::ifstream is(full_path.c_str(), std::ios::in | std::ios::binary);
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if (!is)
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{
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rep = reply::stock_reply(reply::not_found);
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return;
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}
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// Fill out the reply to be sent to the client.
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rep.status = reply::ok;
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char buf[512];
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while (is.read(buf, sizeof(buf)).gcount() > 0)
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rep.content.append(buf, is.gcount());
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rep.headers.resize(2);
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rep.headers[0].name = "Content-Length";
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rep.headers[0].value = std::to_string(rep.content.size());
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rep.headers[1].name = "Content-Type";
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rep.headers[1].value = mime_types::extension_to_type(extension);
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}
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bool request_handler::url_decode(const std::string& in, std::string& out)
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{
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out.clear();
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out.reserve(in.size());
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for (std::size_t i = 0; i < in.size(); ++i)
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{
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if (in[i] == '%')
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{
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if (i + 3 <= in.size())
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{
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int value = 0;
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std::istringstream is(in.substr(i + 1, 2));
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if (is >> std::hex >> value)
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{
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out += static_cast<char>(value);
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i += 2;
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}
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else
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{
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return false;
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}
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}
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else
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{
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return false;
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}
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}
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else if (in[i] == '+')
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{
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out += ' ';
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}
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else
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{
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out += in[i];
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}
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}
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return true;
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}
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} // namespace server
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} // namespace http
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