src/plugins/libravatar/libravatar_federation.c

   1 /*
   2  * Claws Mail -- a GTK based, lightweight, and fast e-mail client
   3  * Copyright (C) 2014-2015 Ricardo Mones and the Claws Mail Team
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdio.h>
  22
  23 #include "libravatar_federation.h"
  24 #include "utils.h"
  25 #include "gtkutils.h"
  26
  27 #define MISSING "x"
  28
  29 #if defined USE_GNUTLS
  30 static GHashTable *federated = NULL;
  31
  32 /**
  33  * Get the associated avatar URL for a domain.
  34  *
  35  * @param domain Domain to get the URL for.
  36  *
  37  * @return The avatar URL for the domain or NULL if not found.
  38  */
  39 static gchar *get_federated_url_for_domain(const gchar *domain)
  40 {
  41         gchar *found;
  42
  43         if (federated == NULL) {
  44                 return NULL;
  45         }
  46
  47         found = (gchar *) g_hash_table_lookup(federated, domain);
  48
  49         if (found != NULL)
  50                 debug_print("cached avatar url for domain %s found: %s\n", domain, found);
  51         else
  52                 debug_print("cached avatar url for domain %s not found\n", domain);
  53
  54         return found;
  55 }
  56
  57 /**
  58  * Adds a URL for a domain.
  59  *
  60  * @param url  The computed avatar URL.
  61  * @param domain  Associated domain.
  62  */
  63 static void add_federated_url_for_domain(const gchar *url, const gchar *domain)
  64 {
  65         if (url == NULL)
  66                 return;
  67
  68         if (federated == NULL)
  69                 federated = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_free);
  70
  71         debug_print("new cached avatar url for domain %s: %s\n", domain, url);
  72         g_hash_table_insert(federated, g_strdup(domain), g_strdup(url));
  73 }
  74 #endif
  75
  76 /**
  77  * Retrieves the federated URL for a given email address.
  78  *
  79  * @param address  The email address.
  80  *
  81  * @return The avatar URL for the domain of the address.
  82  */
  83 gchar *federated_url_for_address(const gchar *address)
  84 {
  85 #if defined USE_GNUTLS
  86         gchar *domain = NULL, *last = NULL, *addr = NULL, *url = NULL;
  87         gchar *host = NULL;
  88         guint16 port = 0;
  89
  90         if (address == NULL || *address == '\0')
  91                 goto invalid_addr;
  92
  93         addr = g_strdup(address);
  94         domain = strchr(addr, '@');
  95         if (domain == NULL)
  96                 goto invalid_addr;
  97
  98         ++domain;
  99         if (strlen(domain) < 5)
 100                 goto invalid_addr;
 101
 102         last = domain;
 103         while (*last != '\0' && *last != ' ' && *last != '\t' && *last != '>')
 104                 ++last;
 105         *last = '\0';
 106
 107         /* try cached domains */
 108         url = get_federated_url_for_domain(domain);
 109         if (url != NULL) {
 110                 g_free(addr);
 111                 if (!strcmp(url, MISSING)) {
 112                         return NULL;
 113                 }
 114                 return g_strdup(url);
 115         }
 116
 117         /* not cached, try secure service first */
 118         if (auto_configure_service_sync("avatars-sec", domain, &host, &port)) {
 119                 if (port != 443) {
 120                         url = g_strdup_printf("https://%s:%d/avatar", host, port);
 121                 } else {
 122                         url = g_strdup_printf("https://%s/avatar", host);
 123                 }
 124         } else { /* try standard one if no secure service available */
 125                 if (auto_configure_service_sync("avatars", domain, &host, &port)) {
 126                         if (port != 80) {
 127                                 url = g_strdup_printf("http://%s:%d/avatar", host, port);
 128                         } else {
 129                                 url = g_strdup_printf("http://%s/avatar", host);
 130                         }
 131                 } else {
 132                         debug_print("libravatar federated domain for %s not found\n", domain);
 133                 }
 134         }
 135         if (url != NULL) {
 136                 add_federated_url_for_domain(url, domain);
 137         } else {
 138                 add_federated_url_for_domain(MISSING, domain);
 139         }
 140
 141         g_free(addr);
 142         return url;
 143
 144 invalid_addr:
 145         if (addr != NULL)
 146                 g_free(addr);
 147
 148         debug_print("invalid address for libravatar federated domain\n");
 149         return NULL;
 150 #else
 151         debug_print("federated domains disabled (built without GnuTLS support)\n");
 152         return NULL;
 153 #endif
 154 }
 155