path: root/libempathy/empathy-utils.c

/*
 * Copyright (C) 2003-2007 Imendio AB
 * Copyright (C) 2007-2008 Collabora Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA  02110-1301  USA
 *
 * Authors: Richard Hult <richard@imendio.com>
 *          Martyn Russell <martyn@imendio.com>
 *          Xavier Claessens <xclaesse@gmail.com>
 *
 * Some snippets are taken from GnuTLS 2.8.6, which is distributed under the
 * same GNU Lesser General Public License 2.1 (or later) version. See
 * empathy_get_x509_certified_hostname ().
 */

#include "config.h"

#include <string.h>
#include <time.h>
#include <sys/types.h>

#include <glib/gi18n-lib.h>

#include <libxml/uri.h>

#include <folks/folks.h>
#include <folks/folks-telepathy.h>

#include <telepathy-glib/account-manager.h>
#include <telepathy-glib/connection.h>
#include <telepathy-glib/channel.h>
#include <telepathy-glib/dbus.h>
#include <telepathy-glib/util.h>

#include "empathy-utils.h"
#include "empathy-contact-manager.h"
#include "empathy-individual-manager.h"
#include "empathy-dispatcher.h"
#include "empathy-idle.h"
#include "empathy-tp-call.h"
#include "empathy-tp-contact-factory.h"

#include <extensions/extensions.h>

#define DEBUG_FLAG EMPATHY_DEBUG_OTHER
#include "empathy-debug.h"

/* Translation between presence types and string */
static struct {
    const gchar *name;
    TpConnectionPresenceType type;
} presence_types[] = {
    { "available", TP_CONNECTION_PRESENCE_TYPE_AVAILABLE },
    { "busy",      TP_CONNECTION_PRESENCE_TYPE_BUSY },
    { "away",      TP_CONNECTION_PRESENCE_TYPE_AWAY },
    { "ext_away",  TP_CONNECTION_PRESENCE_TYPE_EXTENDED_AWAY },
    { "hidden",    TP_CONNECTION_PRESENCE_TYPE_HIDDEN },
    { "offline",   TP_CONNECTION_PRESENCE_TYPE_OFFLINE },
    { "unset",     TP_CONNECTION_PRESENCE_TYPE_UNSET },
    { "unknown",   TP_CONNECTION_PRESENCE_TYPE_UNKNOWN },
    { "error",     TP_CONNECTION_PRESENCE_TYPE_ERROR },
    /* alternative names */
    { "dnd",      TP_CONNECTION_PRESENCE_TYPE_BUSY },
    { "brb",      TP_CONNECTION_PRESENCE_TYPE_AWAY },
    { "xa",       TP_CONNECTION_PRESENCE_TYPE_EXTENDED_AWAY },
    { NULL, },
};



void
empathy_init (void)
{
    static gboolean initialized = FALSE;

    if (initialized)
        return;

    g_type_init ();

    /* Setup gettext */
    bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
    bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");

    /* Setup debug output for empathy and telepathy-glib */
    if (g_getenv ("EMPATHY_TIMING") != NULL) {
        g_log_set_default_handler (tp_debug_timestamped_log_handler, NULL);
    }
    empathy_debug_set_flags (g_getenv ("EMPATHY_DEBUG"));
    tp_debug_divert_messages (g_getenv ("EMPATHY_LOGFILE"));

    emp_cli_init ();

    initialized = TRUE;
}

gchar *
empathy_substring (const gchar *str,
          gint         start,
          gint         end)
{
    return g_strndup (str + start, end - start);
}

gint
empathy_strcasecmp (const gchar *s1,
           const gchar *s2)
{
    return empathy_strncasecmp (s1, s2, -1);
}

gint
empathy_strncasecmp (const gchar *s1,
            const gchar *s2,
            gsize        n)
{
    gchar *u1, *u2;
    gint   ret_val;

    u1 = g_utf8_casefold (s1, n);
    u2 = g_utf8_casefold (s2, n);

    ret_val = g_utf8_collate (u1, u2);
    g_free (u1);
    g_free (u2);

    return ret_val;
}

gboolean
empathy_xml_validate (xmlDoc      *doc,
             const gchar *dtd_filename)
{
    gchar        *path;
    xmlChar      *escaped;
    xmlValidCtxt  cvp;
    xmlDtd       *dtd;
    gboolean      ret;

    path = g_build_filename (g_getenv ("EMPATHY_SRCDIR"), "libempathy",
                 dtd_filename, NULL);
    if (!g_file_test (path, G_FILE_TEST_EXISTS)) {
        g_free (path);
        path = g_build_filename (DATADIR, "empathy", dtd_filename, NULL);
    }
    DEBUG ("Loading dtd file %s", path);

    /* The list of valid chars is taken from libxml. */
    escaped = xmlURIEscapeStr ((const xmlChar *) path,
        (const xmlChar *)":@&=+$,/?;");
    g_free (path);

    memset (&cvp, 0, sizeof (cvp));
    dtd = xmlParseDTD (NULL, escaped);
    ret = xmlValidateDtd (&cvp, doc, dtd);

    xmlFree (escaped);
    xmlFreeDtd (dtd);

    return ret;
}

xmlNodePtr
empathy_xml_node_get_child (xmlNodePtr   node,
               const gchar *child_name)
{
    xmlNodePtr l;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (child_name != NULL, NULL);

    for (l = node->children; l; l = l->next) {
        if (l->name && strcmp ((const gchar *) l->name, child_name) == 0) {
            return l;
        }
    }

    return NULL;
}

xmlChar *
empathy_xml_node_get_child_content (xmlNodePtr   node,
                   const gchar *child_name)
{
    xmlNodePtr l;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (child_name != NULL, NULL);

    l = empathy_xml_node_get_child (node, child_name);
    if (l) {
        return xmlNodeGetContent (l);
    }

    return NULL;
}

xmlNodePtr
empathy_xml_node_find_child_prop_value (xmlNodePtr   node,
                       const gchar *prop_name,
                       const gchar *prop_value)
{
    xmlNodePtr l;
    xmlNodePtr found = NULL;

        g_return_val_if_fail (node != NULL, NULL);
        g_return_val_if_fail (prop_name != NULL, NULL);
        g_return_val_if_fail (prop_value != NULL, NULL);

    for (l = node->children; l && !found; l = l->next) {
        xmlChar *prop;

        if (!xmlHasProp (l, (const xmlChar *) prop_name)) {
            continue;
        }

        prop = xmlGetProp (l, (const xmlChar *) prop_name);
        if (prop && strcmp ((const gchar *) prop, prop_value) == 0) {
            found = l;
        }

        xmlFree (prop);
    }

    return found;
}

const gchar *
empathy_presence_get_default_message (TpConnectionPresenceType presence)
{
    switch (presence) {
    case TP_CONNECTION_PRESENCE_TYPE_AVAILABLE:
        return _("Available");
    case TP_CONNECTION_PRESENCE_TYPE_BUSY:
        return _("Busy");
    case TP_CONNECTION_PRESENCE_TYPE_AWAY:
    case TP_CONNECTION_PRESENCE_TYPE_EXTENDED_AWAY:
        return _("Away");
    case TP_CONNECTION_PRESENCE_TYPE_HIDDEN:
        return _("Invisible");
    case TP_CONNECTION_PRESENCE_TYPE_OFFLINE:
        return _("Offline");
    case TP_CONNECTION_PRESENCE_TYPE_UNKNOWN:
        return _("Unknown");
    case TP_CONNECTION_PRESENCE_TYPE_UNSET:
    case TP_CONNECTION_PRESENCE_TYPE_ERROR:
    default:
        return NULL;
    }

    return NULL;
}

const gchar *
empathy_presence_to_str (TpConnectionPresenceType presence)
{
    int i;

    for (i = 0 ; presence_types[i].name != NULL; i++)
        if (presence == presence_types[i].type)
            return presence_types[i].name;

    return NULL;
}

TpConnectionPresenceType
empathy_presence_from_str (const gchar *str)
{
    int i;

    for (i = 0 ; presence_types[i].name != NULL; i++)
        if (!tp_strdiff (str, presence_types[i].name))
            return presence_types[i].type;

    return TP_CONNECTION_PRESENCE_TYPE_UNSET;
}

static const gchar *
empathy_status_reason_get_default_message (TpConnectionStatusReason reason)
{
    switch (reason) {
    case TP_CONNECTION_STATUS_REASON_NONE_SPECIFIED:
        return _("No reason specified");
    case TP_CONNECTION_STATUS_REASON_REQUESTED:
        return _("Status is set to offline");
    case TP_CONNECTION_STATUS_REASON_NETWORK_ERROR:
        return _("Network error");
    case TP_CONNECTION_STATUS_REASON_AUTHENTICATION_FAILED:
        return _("Authentication failed");
    case TP_CONNECTION_STATUS_REASON_ENCRYPTION_ERROR:
        return _("Encryption error");
    case TP_CONNECTION_STATUS_REASON_NAME_IN_USE:
        return _("Name in use");
    case TP_CONNECTION_STATUS_REASON_CERT_NOT_PROVIDED:
        return _("Certificate not provided");
    case TP_CONNECTION_STATUS_REASON_CERT_UNTRUSTED:
        return _("Certificate untrusted");
    case TP_CONNECTION_STATUS_REASON_CERT_EXPIRED:
        return _("Certificate expired");
    case TP_CONNECTION_STATUS_REASON_CERT_NOT_ACTIVATED:
        return _("Certificate not activated");
    case TP_CONNECTION_STATUS_REASON_CERT_HOSTNAME_MISMATCH:
        return _("Certificate hostname mismatch");
    case TP_CONNECTION_STATUS_REASON_CERT_FINGERPRINT_MISMATCH:
        return _("Certificate fingerprint mismatch");
    case TP_CONNECTION_STATUS_REASON_CERT_SELF_SIGNED:
        return _("Certificate self-signed");
    case TP_CONNECTION_STATUS_REASON_CERT_OTHER_ERROR:
        return _("Certificate error");
    default:
        return _("Unknown reason");
    }
}

static GHashTable *
create_errors_to_message_hash (void)
{
    GHashTable *errors;

    errors = g_hash_table_new (g_str_hash, g_str_equal);
    g_hash_table_insert (errors, TP_ERROR_STR_NETWORK_ERROR, _("Network error"));
    g_hash_table_insert (errors, TP_ERROR_STR_AUTHENTICATION_FAILED,
        _("Authentication failed"));
    g_hash_table_insert (errors, TP_ERROR_STR_ENCRYPTION_ERROR,
        _("Encryption error"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_NOT_PROVIDED,
        _("Certificate not provided"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_UNTRUSTED,
        _("Certificate untrusted"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_EXPIRED,
        _("Certificate expired"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_NOT_ACTIVATED,
        _("Certificate not activated"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_HOSTNAME_MISMATCH,
        _("Certificate hostname mismatch"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_FINGERPRINT_MISMATCH,
        _("Certificate fingerprint mismatch"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_SELF_SIGNED,
        _("Certificate self-signed"));
    g_hash_table_insert (errors, TP_ERROR_STR_CANCELLED,
        _("Status is set to offline"));
    g_hash_table_insert (errors, TP_ERROR_STR_ENCRYPTION_NOT_AVAILABLE,
        _("Encryption is not available"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_INVALID,
        _("Certificate is invalid"));
    g_hash_table_insert (errors, TP_ERROR_STR_CONNECTION_REFUSED,
        _("Connection has been refused"));
    g_hash_table_insert (errors, TP_ERROR_STR_CONNECTION_FAILED,
        _("Connection can't be established"));
    g_hash_table_insert (errors, TP_ERROR_STR_CONNECTION_LOST,
        _("Connection has been lost"));
    g_hash_table_insert (errors, TP_ERROR_STR_ALREADY_CONNECTED,
        _("This resource is already connected to the server"));
    g_hash_table_insert (errors, TP_ERROR_STR_CONNECTION_REPLACED,
        _("Connection has been replaced by a new connection using the "
        "same resource"));
    g_hash_table_insert (errors, TP_ERROR_STR_REGISTRATION_EXISTS,
        _("The account already exists on the server"));
    g_hash_table_insert (errors, TP_ERROR_STR_SERVICE_BUSY,
        _("Server is currently too busy to handle the connection"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_REVOKED,
        _("Certificate has been revoked"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_INSECURE,
        _("Certificate uses an insecure cipher algorithm or is "
        "cryptographically weak"));
    g_hash_table_insert (errors, TP_ERROR_STR_CERT_LIMIT_EXCEEDED,
        _("The length of the server certificate, or the depth of the "
        "server certificate chain, exceed the limits imposed by the "
        "cryptography library"));

    return errors;
}

static const gchar *
empathy_dbus_error_name_get_default_message  (const gchar *error)
{
    static GHashTable *errors_to_message = NULL;

    if (error == NULL)
        return NULL;

    if (G_UNLIKELY (errors_to_message == NULL)) {
        errors_to_message = create_errors_to_message_hash ();
    }

    return g_hash_table_lookup (errors_to_message, error);
}

const gchar *
empathy_account_get_error_message (TpAccount *account,
    gboolean *user_requested)
{
    const gchar *dbus_error;
    const gchar *message;
        const GHashTable *details = NULL;
    TpConnectionStatusReason reason;

    dbus_error = tp_account_get_detailed_error (account, &details);

        if (user_requested != NULL)
          {
            if (tp_asv_get_boolean (details, "user-requested", NULL))
              *user_requested = TRUE;
            else
              *user_requested = FALSE;
          }

    message = empathy_dbus_error_name_get_default_message (dbus_error);
    if (message != NULL)
        return message;

    DEBUG ("Don't understand error '%s'; fallback to the status reason (%u)",
        dbus_error, reason);

    tp_account_get_connection_status (account, &reason);

    return empathy_status_reason_get_default_message (reason);
}

gchar *
empathy_file_lookup (const gchar *filename, const gchar *subdir)
{
    gchar *path;

    if (!subdir) {
        subdir = ".";
    }

    path = g_build_filename (g_getenv ("EMPATHY_SRCDIR"), subdir, filename, NULL);
    if (!g_file_test (path, G_FILE_TEST_EXISTS)) {
        g_free (path);
        path = g_build_filename (DATADIR, "empathy", filename, NULL);
    }

    return path;
}

guint
empathy_proxy_hash (gconstpointer key)
{
    TpProxy      *proxy = TP_PROXY (key);
    TpProxyClass *proxy_class = TP_PROXY_GET_CLASS (key);

    g_return_val_if_fail (TP_IS_PROXY (proxy), 0);
    g_return_val_if_fail (proxy_class->must_have_unique_name, 0);

    return g_str_hash (proxy->object_path) ^ g_str_hash (proxy->bus_name);
}

gboolean
empathy_proxy_equal (gconstpointer a,
             gconstpointer b)
{
    TpProxy *proxy_a = TP_PROXY (a);
    TpProxy *proxy_b = TP_PROXY (b);
    TpProxyClass *proxy_a_class = TP_PROXY_GET_CLASS (a);
    TpProxyClass *proxy_b_class = TP_PROXY_GET_CLASS (b);

    g_return_val_if_fail (TP_IS_PROXY (proxy_a), FALSE);
    g_return_val_if_fail (TP_IS_PROXY (proxy_b), FALSE);
    g_return_val_if_fail (proxy_a_class->must_have_unique_name, 0);
    g_return_val_if_fail (proxy_b_class->must_have_unique_name, 0);

    return g_str_equal (proxy_a->object_path, proxy_b->object_path) &&
           g_str_equal (proxy_a->bus_name, proxy_b->bus_name);
}

gboolean
empathy_check_available_state (void)
{
    TpConnectionPresenceType presence;
    EmpathyIdle *idle;

    idle = empathy_idle_dup_singleton ();
    presence = empathy_idle_get_state (idle);
    g_object_unref (idle);

    if (presence != TP_CONNECTION_PRESENCE_TYPE_AVAILABLE &&
        presence != TP_CONNECTION_PRESENCE_TYPE_UNSET) {
        return FALSE;
    }

    return TRUE;
}

gint
empathy_uint_compare (gconstpointer a,
              gconstpointer b)
{
    return *(guint *) a - *(guint *) b;
}

gchar *
empathy_protocol_icon_name (const gchar *protocol)
{
  if (!tp_strdiff (protocol, "yahoojp"))
    /* Yahoo Japan uses the same icon as Yahoo */
    protocol = "yahoo";
  else if (!tp_strdiff (protocol, "simple"))
    /* SIMPLE uses the same icon as SIP */
    protocol = "sip";
  else if (!tp_strdiff (protocol, "sms"))
    return g_strdup ("phone");

  return g_strdup_printf ("im-%s", protocol);
}

GType
empathy_type_dbus_ao (void)
{
  static GType t = 0;

  if (G_UNLIKELY (t == 0))
     t = dbus_g_type_get_collection ("GPtrArray", DBUS_TYPE_G_OBJECT_PATH);

  return t;
}

const char *
empathy_protocol_name_to_display_name (const gchar *proto_name)
{
  int i;
  static struct {
    const gchar *proto;
    const gchar *display;
    gboolean translated;
  } names[] = {
    { "jabber", "Jabber", FALSE },
    { "msn", "MSN", FALSE, },
    { "local-xmpp", N_("People Nearby"), TRUE },
    { "irc", "IRC", FALSE },
    { "icq", "ICQ", FALSE },
    { "aim", "AIM", FALSE },
    { "yahoo", "Yahoo!", FALSE },
    { "yahoojp", N_("Yahoo! Japan"), TRUE },
    { "groupwise", "GroupWise", FALSE },
    { "sip", "SIP", FALSE },
    { NULL, NULL }
  };

  for (i = 0; names[i].proto != NULL; i++)
    {
      if (!tp_strdiff (proto_name, names[i].proto))
        {
          if (names[i].translated)
            return gettext (names[i].display);
          else
            return names[i].display;
        }
    }

  return proto_name;
}

const char *
empathy_service_name_to_display_name (const gchar *service_name)
{
  int i;
  static struct {
    const gchar *service;
    const gchar *display;
    gboolean translated;
  } names[] = {
    { "google-talk", N_("Google Talk"), FALSE },
    { "facebook", N_("Facebook Chat"), TRUE },
    { "ovi-chat", "Ovi", FALSE },
    { NULL, NULL }
  };

  for (i = 0; names[i].service != NULL; i++)
    {
      if (!tp_strdiff (service_name, names[i].service))
        {
          if (names[i].translated)
            return gettext (names[i].display);
          else
            return names[i].display;
        }
    }

  return service_name;
}

/* Note: this function depends on the account manager having its core feature
 * prepared. */
TpAccount *
empathy_get_account_for_connection (TpConnection *connection)
{
  TpAccountManager *manager;
  TpAccount *account = NULL;
  GList *accounts, *l;

  manager = tp_account_manager_dup ();

  accounts = tp_account_manager_get_valid_accounts (manager);

  for (l = accounts; l != NULL; l = l->next)
    {
      TpAccount *a = l->data;

      if (tp_account_get_connection (a) == connection)
        {
          account = a;
          break;
        }
    }

  g_list_free (accounts);
  g_object_unref (manager);

  return account;
}

gboolean
empathy_account_manager_get_accounts_connected (gboolean *connecting)
{
  TpAccountManager *manager;
  GList *accounts, *l;
  gboolean out_connecting = FALSE;
  gboolean out_connected = FALSE;

  manager = tp_account_manager_dup ();

  if (G_UNLIKELY (!tp_account_manager_is_prepared (manager,
          TP_ACCOUNT_MANAGER_FEATURE_CORE)))
    g_critical (G_STRLOC ": %s called before AccountManager ready", G_STRFUNC);

  accounts = tp_account_manager_get_valid_accounts (manager);

  for (l = accounts; l != NULL; l = l->next)
    {
      TpConnectionStatus s = tp_account_get_connection_status (
          TP_ACCOUNT (l->data), NULL);

      if (s == TP_CONNECTION_STATUS_CONNECTING)
        out_connecting = TRUE;
      else if (s == TP_CONNECTION_STATUS_CONNECTED)
        out_connected = TRUE;

      if (out_connecting && out_connected)
        break;
    }

  g_list_free (accounts);
  g_object_unref (manager);

  if (connecting != NULL)
    *connecting = out_connecting;

  return out_connected;
}

/* Change the RequestedPresence of a newly created account to ensure that it
 * is actually connected. */
void
empathy_connect_new_account (TpAccount *account,
    TpAccountManager *account_manager)
{
  TpConnectionPresenceType presence;
  gchar *status, *message;

  /* only force presence if presence was offline, unknown or unset */
  presence = tp_account_get_requested_presence (account, NULL, NULL);
  switch (presence)
    {
      case TP_CONNECTION_PRESENCE_TYPE_OFFLINE:
      case TP_CONNECTION_PRESENCE_TYPE_UNKNOWN:
      case TP_CONNECTION_PRESENCE_TYPE_UNSET:
        presence = tp_account_manager_get_most_available_presence (
            account_manager, &status, &message);

        if (presence == TP_CONNECTION_PRESENCE_TYPE_OFFLINE)
          /* Global presence is offline; we force it so user doesn't have to
           * manually change the presence to connect his new account. */
          presence = TP_CONNECTION_PRESENCE_TYPE_AVAILABLE;

        tp_account_request_presence_async (account, presence,
            status, NULL, NULL, NULL);

        g_free (status);
        g_free (message);
        break;

       case TP_CONNECTION_PRESENCE_TYPE_AVAILABLE:
       case TP_CONNECTION_PRESENCE_TYPE_AWAY:
       case TP_CONNECTION_PRESENCE_TYPE_EXTENDED_AWAY:
       case TP_CONNECTION_PRESENCE_TYPE_HIDDEN:
       case TP_CONNECTION_PRESENCE_TYPE_BUSY:
       case TP_CONNECTION_PRESENCE_TYPE_ERROR:
       default:
        /* do nothing if the presence is not offline */
        break;
    }
}

/* Translate Folks' general presence type to the Tp presence type */
TpConnectionPresenceType
empathy_folks_presence_type_to_tp (FolksPresenceType type)
{
  return (TpConnectionPresenceType) type;
}

/* Returns TRUE if the given Individual contains a TpContact */
gboolean
empathy_folks_individual_contains_contact (FolksIndividual *individual)
{
  GList *personas, *l;

  g_return_val_if_fail (FOLKS_IS_INDIVIDUAL (individual), FALSE);

  personas = folks_individual_get_personas (individual);
  for (l = personas; l != NULL; l = l->next)
    {
      if (TPF_IS_PERSONA (l->data))
        return (tpf_persona_get_contact (TPF_PERSONA (l->data)) != NULL);
    }

  return FALSE;
}

/* TODO: this needs to be eliminated (and replaced in some cases with user
 * prompts) when we break the assumption that FolksIndividuals are 1:1 with
 * TpContacts */

/* Retrieve the EmpathyContact corresponding to the first TpContact contained
 * within the given Individual. Note that this is a temporary convenience. See
 * the TODO above. */
EmpathyContact *
empathy_contact_dup_from_folks_individual (FolksIndividual *individual)
{
  GList *personas, *l;
  EmpathyContact *contact = NULL;

  g_return_val_if_fail (FOLKS_IS_INDIVIDUAL (individual), NULL);

  personas = folks_individual_get_personas (individual);
  for (l = personas; (l != NULL) && (contact == NULL); l = l->next)
    {
      TpfPersona *persona = l->data;

      if (TPF_IS_PERSONA (persona))
        {
          TpContact *tp_contact;

          tp_contact = tpf_persona_get_contact (persona);
          contact = empathy_contact_dup_from_tp_contact (tp_contact);
          empathy_contact_set_persona (contact, FOLKS_PERSONA (persona));
        }
    }

  return contact;
}

TpChannelGroupChangeReason
tp_channel_group_change_reason_from_folks_groups_change_reason (
    FolksGroupableChangeReason reason)
{
  return (TpChannelGroupChangeReason) reason;
}

TpfPersonaStore *
empathy_get_persona_store_for_connection (TpConnection *connection)
{
  FolksBackendStore *backend_store;
  FolksBackend *backend;
  TpfPersonaStore *result = NULL;

  backend_store = folks_backend_store_dup ();
  backend = folks_backend_store_get_backend_by_name (backend_store,
      "telepathy");
  if (backend != NULL)
    {
      GHashTable *stores_hash;
      GList *stores, *l;

      stores_hash = folks_backend_get_persona_stores (backend);
      stores = g_hash_table_get_values (stores_hash);
      for (l = stores; l != NULL && result == NULL; l = l->next)
        {
          TpfPersonaStore *persona_store = TPF_PERSONA_STORE (l->data);
          TpAccount *account;
          TpConnection *conn_cur;

          account = tpf_persona_store_get_account (persona_store);
          conn_cur = tp_account_get_connection (account);
          if (conn_cur == connection)
            result = persona_store;
        }

      g_list_free (stores);
    }

  g_object_unref (backend);
  g_object_unref (backend_store);

  return result;
}

gboolean
empathy_connection_can_add_personas (TpConnection *connection)
{
  FolksPersonaStore *persona_store;

  g_return_val_if_fail (TP_IS_CONNECTION (connection), FALSE);

  persona_store = FOLKS_PERSONA_STORE (
      empathy_get_persona_store_for_connection (connection));

  return (folks_persona_store_get_can_add_personas (persona_store) ==
      FOLKS_MAYBE_BOOL_TRUE);
}

gboolean
empathy_connection_can_alias_personas (TpConnection *connection)
{
  FolksPersonaStore *persona_store;

  g_return_val_if_fail (TP_IS_CONNECTION (connection), FALSE);

  persona_store = FOLKS_PERSONA_STORE (
      empathy_get_persona_store_for_connection (connection));

  return (folks_persona_store_get_can_alias_personas (persona_store) ==
      FOLKS_MAYBE_BOOL_TRUE);
}

gboolean
empathy_connection_can_group_personas (TpConnection *connection)
{
  FolksPersonaStore *persona_store;

  g_return_val_if_fail (TP_IS_CONNECTION (connection), FALSE);

  persona_store = FOLKS_PERSONA_STORE (
      empathy_get_persona_store_for_connection (connection));

  return (folks_persona_store_get_can_group_personas (persona_store) ==
      FOLKS_MAYBE_BOOL_TRUE);
}

gchar *
empathy_get_x509_certificate_hostname (gnutls_x509_crt_t cert)
{
  gchar dns_name[256];
  gsize dns_name_size;
  gint idx;
  gint res = 0;

  /* this snippet is taken from GnuTLS.
   * see gnutls/lib/x509/rfc2818_hostname.c
   */
  for (idx = 0; res >= 0; idx++)
    {
      dns_name_size = sizeof (dns_name);
      res = gnutls_x509_crt_get_subject_alt_name (cert, idx,
          dns_name, &dns_name_size, NULL);

      if (res == GNUTLS_SAN_DNSNAME || res == GNUTLS_SAN_IPADDRESS)
        return g_strndup (dns_name, dns_name_size);
    }

  dns_name_size = sizeof (dns_name);
  res = gnutls_x509_crt_get_dn_by_oid (cert, GNUTLS_OID_X520_COMMON_NAME,
      0, 0, dns_name, &dns_name_size);

  if (res >= 0)
    return g_strndup (dns_name, dns_name_size);

  return NULL;
}