src/curl/resolve.c

   1 /* libquvi
   2  * Copyright (C) 2012  Toni Gundogdu <legatvs@gmail.com>
   3  *
   4  * This file is part of libquvi <http://quvi.sourceforge.net/>.
   5  *
   6  * This library is free software: you can redistribute it and/or
   7  * modify it under the terms of the GNU Affero General Public
   8  * License as published by the Free Software Foundation, either
   9  * version 3 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU Affero General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Affero General
  17  * Public License along with this library.  If not, see
  18  * <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "config.h"
  22
  23 #include <glib/gi18n-lib.h>
  24 #include <glib.h>
  25 #include <curl/curl.h>
  26
  27 #include "quvi.h"
  28 /* -- */
  29 #include "_quvi_s.h"
  30 #include "_quvi_net_resolve_s.h"
  31 /* -- */
  32 #include "curl/autoproxy.h"
  33
  34 /* Set cURL options. */
  35 static void _set_opts(_quvi_net_resolve_t r, CURL *c)
  36 {
  37   curl_easy_setopt(c, CURLOPT_URL, r->url.addr->str);
  38   /* Use HEAD request: we're only interested in the header metadata. */
  39   curl_easy_setopt(c, CURLOPT_NOBODY, 1L); /* GET -> HEAD. */
  40
  41   c_autoproxy(r->handle.quvi, r->url.addr->str);
  42 }
  43
  44 static void _reset_opts(CURL *c)
  45 {
  46   curl_easy_setopt(c, CURLOPT_HTTPGET, 1L); /* HEAD -> GET. */
  47 }
  48
  49 static const gchar *_EOK = N_("The server responded with the code %03ld");
  50
  51 /* Check whether the server returned a redirection URL. */
  52 static QuviError _chk_redir(_quvi_net_resolve_t r, CURL *c)
  53 {
  54   CURLcode curlcode;
  55   QuviError rc;
  56
  57   curlcode = curl_easy_perform(c);
  58   curl_easy_getinfo(c, CURLINFO_RESPONSE_CODE, &r->status.resp_code);
  59
  60   rc = QUVI_OK;
  61
  62   if (curlcode == CURLE_OK && r->status.resp_code == 200)
  63     {
  64       gchar *u = NULL;
  65       curl_easy_getinfo(c, CURLINFO_EFFECTIVE_URL, &u);
  66       /* Leave comparison for resolve_redirections.lua */
  67       g_string_assign(r->url.dst, u);
  68     }
  69   else
  70     {
  71       if (curlcode == CURLE_OK)
  72         {
  73           g_string_printf(r->status.errmsg,
  74                           g_dgettext(GETTEXT_PACKAGE, _EOK),
  75                           r->status.resp_code);
  76         }
  77       else
  78         {
  79           const gchar *s = curl_easy_strerror(curlcode);
  80           const glong c = r->status.resp_code;
  81           const gint cc = curlcode;
  82 #define _ENO "%s (HTTP/%03ld, cURL=0x%03x)"
  83           g_string_printf(r->status.errmsg, _ENO, s, c, cc);
  84 #undef _ENO
  85         }
  86       rc = QUVI_ERROR_CALLBACK;
  87     }
  88   return (rc);
  89 }
  90
  91 /* Resolve an URL redirection if needed. */
  92 QuviError c_resolve(_quvi_t q, _quvi_net_resolve_t r)
  93 {
  94   QuviError rc;
  95   CURL *c;
  96
  97   c = q->handle.curl;
  98
  99   _set_opts(r, c);
 100   rc = _chk_redir(r, c);
 101   _reset_opts(c);
 102
 103   return (rc);
 104 }
 105
 106 /* vim: set ts=2 sw=2 tw=72 expandtab: */