src/basic/web-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2010 Lennart Poettering
   6 ***/
   7
   8 #include <stdbool.h>
   9
  10 #include "string-util.h"
  11 #include "utf8.h"
  12 #include "web-util.h"
  13
  14 bool http_etag_is_valid(const char *etag) {
  15         if (isempty(etag))
  16                 return false;
  17
  18         if (!endswith(etag, "\""))
  19                 return false;
  20
  21         if (!startswith(etag, "\"") && !startswith(etag, "W/\""))
  22                 return false;
  23
  24         return true;
  25 }
  26
  27 bool http_url_is_valid(const char *url) {
  28         const char *p;
  29
  30         if (isempty(url))
  31                 return false;
  32
  33         p = startswith(url, "http://");
  34         if (!p)
  35                 p = startswith(url, "https://");
  36         if (!p)
  37                 return false;
  38
  39         if (isempty(p))
  40                 return false;
  41
  42         return ascii_is_valid(p);
  43 }
  44
  45 bool documentation_url_is_valid(const char *url) {
  46         const char *p;
  47
  48         if (isempty(url))
  49                 return false;
  50
  51         if (http_url_is_valid(url))
  52                 return true;
  53
  54         p = startswith(url, "file:/");
  55         if (!p)
  56                 p = startswith(url, "info:");
  57         if (!p)
  58                 p = startswith(url, "man:");
  59
  60         if (isempty(p))
  61                 return false;
  62
  63         return ascii_is_valid(p);
  64 }