src/basic/web-util.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdbool.h>
  21
  22 #include "string-util.h"
  23 #include "utf8.h"
  24 #include "web-util.h"
  25
  26 bool http_etag_is_valid(const char *etag) {
  27         if (isempty(etag))
  28                 return false;
  29
  30         if (!endswith(etag, "\""))
  31                 return false;
  32
  33         if (!startswith(etag, "\"") && !startswith(etag, "W/\""))
  34                 return false;
  35
  36         return true;
  37 }
  38
  39 bool http_url_is_valid(const char *url) {
  40         const char *p;
  41
  42         if (isempty(url))
  43                 return false;
  44
  45         p = startswith(url, "http://");
  46         if (!p)
  47                 p = startswith(url, "https://");
  48         if (!p)
  49                 return false;
  50
  51         if (isempty(p))
  52                 return false;
  53
  54         return ascii_is_valid(p);
  55 }
  56
  57 bool documentation_url_is_valid(const char *url) {
  58         const char *p;
  59
  60         if (isempty(url))
  61                 return false;
  62
  63         if (http_url_is_valid(url))
  64                 return true;
  65
  66         p = startswith(url, "file:/");
  67         if (!p)
  68                 p = startswith(url, "info:");
  69         if (!p)
  70                 p = startswith(url, "man:");
  71
  72         if (isempty(p))
  73                 return false;
  74
  75         return ascii_is_valid(p);
  76 }