src/parse_url.cpp

   1 /*
   2
   3 Copyright (c) 2008, Arvid Norberg
   4 All rights reserved.
   5
   6 Redistribution and use in source and binary forms, with or without
   7 modification, are permitted provided that the following conditions
   8 are met:
   9
  10     * Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12     * Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in
  14       the documentation and/or other materials provided with the distribution.
  15     * Neither the name of the author nor the names of its
  16       contributors may be used to endorse or promote products derived
  17       from this software without specific prior written permission.
  18
  19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  23 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29 POSSIBILITY OF SUCH DAMAGE.
  30
  31 */
  32
  33 #include "libtorrent/parse_url.hpp"
  34 #include <algorithm>
  35
  36 namespace libtorrent
  37 {
  38
  39         // returns protocol, auth, hostname, port, path, error
  40         boost::tuple<std::string, std::string, std::string, int, std::string, char const*>
  41                 parse_url_components(std::string url)
  42         {
  43                 std::string hostname; // hostname only
  44                 std::string auth; // user:pass
  45                 std::string protocol; // http or https for instance
  46                 char const* error = 0;
  47                 int port = 80;
  48
  49                 std::string::iterator at;
  50                 std::string::iterator colon;
  51                 std::string::iterator port_pos;
  52
  53                 // PARSE URL
  54                 std::string::iterator start = url.begin();
  55                 // remove white spaces in front of the url
  56                 while (start != url.end() && (*start == ' ' || *start == '\t'))
  57                         ++start;
  58                 std::string::iterator end
  59                         = std::find(url.begin(), url.end(), ':');
  60                 protocol.assign(start, end);
  61
  62                 if (protocol == "https") port = 443;
  63
  64                 if (end == url.end())
  65                 {
  66                         error = "no protocol in url";
  67                         goto exit;
  68                 }
  69                 ++end;
  70                 if (end == url.end() || *end != '/')
  71                 {
  72                         error = "incomplete protocol";
  73                         goto exit;
  74                 }
  75                 ++end;
  76                 if (end == url.end() || *end != '/')
  77                 {
  78                         error = "incomplete protocol";
  79                         goto exit;
  80                 }
  81                 ++end;
  82                 start = end;
  83
  84                 at = std::find(start, url.end(), '@');
  85                 colon = std::find(start, url.end(), ':');
  86                 end = std::find(start, url.end(), '/');
  87
  88                 if (at != url.end()
  89                         && colon != url.end()
  90                         && colon < at
  91                         && at < end)
  92                 {
  93                         auth.assign(start, at);
  94                         start = at;
  95                         ++start;
  96                 }
  97
  98                 // this is for IPv6 addresses
  99                 if (start != url.end() && *start == '[')
 100                 {
 101                         port_pos = std::find(start, url.end(), ']');
 102                         if (port_pos == url.end())
 103                         {
 104                                 error = "expected closing ']' for address";
 105                                 goto exit;
 106                         }
 107                         port_pos = std::find(port_pos, url.end(), ':');
 108                 }
 109                 else
 110                 {
 111                         port_pos = std::find(start, url.end(), ':');
 112                 }
 113
 114                 if (port_pos < end)
 115                 {
 116                         hostname.assign(start, port_pos);
 117                         ++port_pos;
 118                         port = atoi(std::string(port_pos, end).c_str());
 119                 }
 120                 else
 121                 {
 122                         hostname.assign(start, end);
 123                 }
 124
 125                 start = end;
 126 exit:
 127                 return boost::make_tuple(protocol, auth, hostname, port
 128                         , std::string(start, url.end()), error);
 129         }
 130
 131 }
 132