nel/src/gui/url_parser.cpp

   1 // Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
   2 // Copyright (C) 2010-2016  Winch Gate Property Limited
   3 //
   4 // This source file has been modified by the following contributors:
   5 // Copyright (C) 2020  Jan BOON (Kaetemi) <jan.boon@kaetemi.be>
   6 //
   7 // This program is free software: you can redistribute it and/or modify
   8 // it under the terms of the GNU Affero General Public License as
   9 // published by the Free Software Foundation, either version 3 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU Affero General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU Affero General Public License
  18 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 #include "stdpch.h"
  21 #include "nel/misc/common.h"
  22 #include "nel/gui/url_parser.h"
  23
  24 using namespace std;
  25
  26 #ifdef DEBUG_NEW
  27 #define new DEBUG_NEW
  28 #endif
  29
  30 namespace NLGUI
  31 {
  32         // ***************************************************************************
  33         CUrlParser::CUrlParser(const std::string &uri)
  34         {
  35                 parse(uri);
  36         }
  37
  38         // ***************************************************************************
  39         void CUrlParser::parse(std::string uri)
  40         {
  41                 const size_t npos = std::string::npos;
  42                 size_t pos;
  43                 size_t offset = 0;
  44
  45                 // strip fragment if present
  46                 pos = uri.find("#");
  47                 if (pos != npos)
  48                 {
  49                         hash = uri.substr(pos + 1);
  50                         uri = uri.substr(0, pos);
  51                 }
  52
  53                 // scan for scheme
  54                 pos = uri.find(":");
  55                 if (pos != npos && pos >= 1)
  56                 {
  57                         for (uint i=0; i<pos; i++)
  58                         {
  59                                 if (!isalnum(uri[i]))
  60                                 {
  61                                         pos = npos;
  62                                         break;
  63                                 }
  64                         }
  65                         if (pos != npos)
  66                         {
  67                                 scheme = uri.substr(0, pos);
  68                                 uri = uri.substr(pos + 1);
  69                         }
  70                 }
  71
  72                 // scan for authority
  73                 if (uri.substr(0, 2) == "//")
  74                 {
  75                         pos = uri.find_first_of("/?", 2);
  76                         authority = uri.substr(0, pos);
  77                         if (pos != npos)
  78                                 uri = uri.substr(pos);
  79                         else
  80                                 uri.clear();
  81
  82                         // strip empty port from authority
  83                         if (authority.find_last_of(":") == authority.length() - 1)
  84                                 authority = authority.substr(0, authority.length() - 1);
  85
  86                         // extract host from user:pass@host:port
  87                         pos = authority.find("@");
  88                         if (pos != npos)
  89                                 host = authority.substr(pos + 1);
  90                         else
  91                                 host = authority.substr(2);
  92
  93                         // case-insensitive
  94                         host = NLMISC::toLowerAscii(host);
  95
  96                         pos = host.find(":");
  97                         if (pos != npos)
  98                                 host = host.substr(0, pos);
  99                 }
 100
 101                 // scan for query
 102                 pos = uri.find("?");
 103                 if (pos != npos)
 104                 {
 105                         query = uri.substr(pos);
 106                         uri = uri.substr(0, pos);
 107                 }
 108
 109                 // all that is remaining is path
 110                 path = uri;
 111         }
 112
 113         void CUrlParser::inherit(const std::string &url)
 114         {
 115                 // we have scheme, so we already absolute url
 116                 if (!scheme.empty())
 117                         return;
 118
 119                 const size_t npos = std::string::npos;
 120                 size_t pos;
 121
 122                 CUrlParser base(url);
 123
 124                 scheme = base.scheme;
 125
 126                 // if we already have authority, then ignore base path
 127                 if (!authority.empty())
 128                         return;
 129
 130                 authority = base.authority;
 131                 if (path.empty())
 132                 {
 133                         path = base.path;
 134                         if (query.empty())
 135                                 query = base.query;
 136                 }
 137                 else
 138                 if (path[0] != '/')
 139                 {
 140                         // find start of last path segment from base path
 141                         // if not found, then dont inherit base path at all
 142                         pos = base.path.find_last_of("/");
 143                         if (pos != npos)
 144                                 path = base.path.substr(0, pos) + "/" + path;
 145                 }
 146
 147                 resolveRelativePath(path);
 148         }
 149
 150         void CUrlParser::resolveRelativePath(std::string &path)
 151         {
 152                 const size_t npos = std::string::npos;
 153
 154                 // no relative components in path. filename.ext is also matched, but that's fine
 155                 size_t pos = path.find(".");
 156                 if (pos == npos)
 157                         return;
 158
 159                 // normalize path
 160                 size_t lhp = 0;
 161                 while(pos < path.size())
 162                 {
 163                         if (path[pos] == '.')
 164                         {
 165                                 // scan ahead to see what we have
 166                                 std::string sub = path.substr(pos, 2);
 167                                 if (sub == "./" || sub == ".")
 168                                 {
 169                                         // starts with
 170                                         if (pos == 0)
 171                                                 path.replace(pos, sub.size(), "/");
 172                                         else
 173                                         {
 174                                                 // full or last segment
 175                                                 sub = path.substr(pos-1, 3);
 176                                                 if (sub == "/./" || sub == "/.")
 177                                                 {
 178                                                         path.replace(pos, sub.size()-1, "");
 179                                                         // we just removed char that pos was pointing, so rewind
 180                                                         pos--;
 181                                                 }
 182                                         }
 183                                 }
 184                                 else
 185                                 if (sub == "..")
 186                                 {
 187                                         // starts with
 188                                         if (pos == 0 && path.substr(pos, 3) == "../")
 189                                                 path.replace(pos, 3, "/");
 190                                         else
 191                                         if (pos > 0)
 192                                         {
 193                                                 // full or last segment
 194                                                 sub = path.substr(pos-1, 4);
 195                                                 if (sub == "/../" || sub == "/..")
 196                                                 {
 197                                                         if (pos > 1)
 198                                                                 lhp = path.find_last_of("/", pos - 2);
 199                                                         else
 200                                                                 lhp = 0;
 201
 202                                                         // pos points to first dot in ..
 203                                                         // lhp points to start slash (/) of last segment
 204                                                         pos += sub.size() - 1;
 205                                                         path.replace(lhp, pos - lhp, "/");
 206                                                         pos = lhp;
 207                                                 }
 208                                         }
 209                                 }// sub == ".."
 210                         } // path[pos] == '.'
 211                         pos++;
 212                 }// while
 213         }
 214
 215         bool CUrlParser::isAbsolute() const
 216         {
 217                 return !scheme.empty() && !authority.empty();
 218         }
 219
 220         // serialize URL back to string
 221         std::string CUrlParser::toString() const
 222         {
 223                 std::string result;
 224                 if (!scheme.empty())
 225                         result += scheme + ":";
 226
 227                 if (!authority.empty())
 228                 {
 229                         result += authority;
 230                 }
 231
 232                 // path already has leading slash
 233                 if (!path.empty())
 234                 {
 235                         result += path;
 236                 }
 237
 238                 if (!query.empty())
 239                 {
 240                         if (query.find_first_of("?") != 0) result += "?";
 241
 242                         result += query;
 243                 }
 244
 245                 if (!hash.empty())
 246                 {
 247                         result += "#" + hash;
 248                 }
 249
 250                 return result;
 251         }
 252
 253 }// namespace
 254