tiny_web_server/request_processor.cpp at master · khvorov/tiny_web_server · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
#include <fstream>
#include <iostream>
#include <map>
#include <regex>
#include <sstream>

#include <sys/socket.h>
#include <unistd.h>

#include "configuration.hpp"
#include "request_processor.hpp"

namespace
{
struct http_request
{
public:
    http_request(const ByteBuffer & req)
    {
        std::match_results<ByteBuffer::const_iterator> request_match;

        if (std::regex_search(req.begin(), req.end(), request_match, request_regex))
        {
            if (request_match.size() == 4)
            {
                request = request_match[1].str();
                data = request_match[2].str();
                version = request_match[3].str();
            }
        }
    }

    std::string request;
    std::string data;
    std::string version;

private:
    static std::regex request_regex;
};

std::regex http_request::request_regex("^\\s*([A-Z]*)\\s+(.*?)\\s+HTTP\\/(\\d\\.\\d).*");

const std::string & get_content_type(const std::string & file)
{
    // TODO: that function can be implemented using libmagic library
    static std::regex file_extension_regex("^.*\\.(\\w+)$");

    static const std::string defaultContentType("text/plain");
    static const std::map<std::string, std::string> fileToContentType = {
        {"html", "text/html"},
        {"htm", "text/html"},
        {"shtm", "text/html"},
        {"shtml", "text/html"},
        {"css", "text/css"},
        {"js", "application/x-javascript"},
        {"ico", "image/x-icon"},
        {"gif", "image/gif"},
        {"jpg", "image/jpeg"},
        {"jpeg", "image/jpeg"},
        {"png", "image/png"},
        {"svg", "image/svg+xml"},
        {"txt", "text/plain"},
        {"torrent", "application/x-bittorrent"},
        {"wav", "audio/x-wav"},
        {"mp3", "audio/x-mp3"},
        {"mid", "audio/mid"},
        {"m3u", "audio/x-mpegurl"},
        {"ogg", "application/ogg"},
        {"ram", "audio/x-pn-realaudio"},
        {"xml", "text/xml"},
        {"json", "application/json"},
        {"xslt", "application/xml"},
        {"xsl", "application/xml"},
        {"ra", "audio/x-pn-realaudio"},
        {"doc", "application/msword"},
        {"exe", "application/octet-stream"},
        {"zip", "application/x-zip-compressed"},
        {"xls", "application/excel"},
        {"tgz", "application/x-tar-gz"},
        {"tar", "application/x-tar"},
        {"gz", "application/x-gunzip"},
        {"arj", "application/x-arj-compressed"},
        {"rar", "application/x-rar-compressed"},
        {"rtf", "application/rtf"},
        {"pdf", "application/pdf"},
        {"swf", "application/x-shockwave-flash"},
        {"mpg", "video/mpeg"},
        {"webm", "video/webm"},
        {"mpeg", "video/mpeg"},
        {"mov", "video/quicktime"},
        {"mp4", "video/mp4"},
        {"m4v", "video/x-m4v"},
        {"asf", "video/x-ms-asf"},
        {"avi", "video/x-msvideo"},
        {"bmp", "image/bmp"},
        {"ttf", "application/x-font-ttf"}
    };

    std::smatch request_match;

    if (std::regex_search(file, request_match, file_extension_regex))
    {
        if (request_match.size() == 2)
        {
            auto contentType = fileToContentType.find(request_match[1].str());

            if (contentType != fileToContentType.end())
            {
                return contentType->second;
            }
        }
    }

    return defaultContentType;
}

bool is_relative_path(const std::string & path)
{
    static std::regex rpath_regex("\\.\\.");

    std::smatch request_match;

    return std::regex_search(path, request_match, rpath_regex);
}

std::string generate_error_response(const std::string & reason, const std::string & text)
{
    std::stringstream ss;

    ss << "HTTP/1.1 " << reason << "\r\n"
       << "Connection: close\r\n"
       << "Server: localhost\r\n"
       << "Content-Type: text/html\r\n\r\n"
       << "<html><head><title>" << reason << "</title>"
       << "<style type=\"text/css\"><!--/*--><![CDATA[/*><!--*/body{color:#000;background-color:#FFF;font-family:sans-serif;}/*]]>*/--></style>"
       << "</head><body><h1>" << reason << "</h1><p>"
       << text
       << "</p></body></html>";

    return ss.str();
}

}

void request_processor::operator()(ByteBufferPtr buffer, int fd)
{
    if (!buffer)
    {
        // pointer to the buffer is null
        return;
    }

    // parse header
    http_request request(*buffer);
    std::stringstream ss;
    bool closeConnection = true;

    printf("got %lu bytes on descriptor %d, request = %s, data = %s\n",
        buffer->size(), fd, request.request.c_str(), request.data.c_str());

    if (request.request == "GET")
    {
        // checking for relative path in the request to deny access to top-level directories
        if (!is_relative_path(request.data))
        {
            ss << configuration::instance().rootPath;

            if (request.data.empty() || request.data == "/")
            {
                ss << "/index.html";
            }
            else
            {
                ss << request.data;
            }

            std::string fullPath = ss.str();

            // search for the file
            std::ifstream inFile(fullPath.c_str(), std::ios::in | std::ios::binary);

            ss.str(std::string());

            if (inFile.is_open())
            {
                // getting file size
                inFile.seekg(0, std::ios::end);
                auto fileSize = inFile.tellg();
                inFile.seekg(0, std::ios::beg);

                // read file
                ss << "HTTP/" << request.version << " 200 OK\r\n"
                   << "Connection: close\r\n"
                   << "Server: localhost\r\n"
                   << "Content-Length:" << fileSize << "\r\n"
                   << "Content-Type: " << get_content_type(fullPath) << "\r\n\r\n"
                   << inFile.rdbuf();

                closeConnection = true;
            }
            else
            {
                // 404 Not Found
                std::stringstream message;
                message << "The requested URL (" << request.data << ") was not found on this server.";
                ss << generate_error_response("404 Not found", message.str());
            }
        }
        else
        {
            std::stringstream message;
            message << "Access to " << request.data << " is forbidden";
            ss << generate_error_response("403 Forbidden", message.str());
        }
    }
    else
    {
        ss << generate_error_response("400 Bad Request", "Request is not supported");
    }

    std::string output(ss.str());

    send(fd, output.c_str(), output.size(), 0);

    if (closeConnection)
    {
        close(fd);
    }
}