path: root/src/empathy-filter.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2007-2008 Collabora Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Authors: Xavier Claessens <xclaesse@gmail.com>
 */

#include <config.h>

#include <string.h>

#include <glib/gi18n.h>

#include <telepathy-glib/enums.h>
#include <telepathy-glib/channel.h>
#include <telepathy-glib/connection.h>
#include <telepathy-glib/util.h>
#include <telepathy-glib/dbus.h>
#include <telepathy-glib/proxy-subclass.h>

#include <libmissioncontrol/mission-control.h>
#include <libmissioncontrol/mc-account.h>

#include <extensions/extensions.h>

#include <libempathy/empathy-tp-chat.h>
#include <libempathy/empathy-tp-call.h>
#include <libempathy/empathy-tp-group.h>
#include <libempathy/empathy-utils.h>
#include <libempathy/empathy-debug.h>
#include <libempathy/empathy-tube-handler.h>

#include <libempathy-gtk/empathy-chat.h>
#include <libempathy-gtk/empathy-images.h>
#include <libempathy-gtk/empathy-contact-dialogs.h>

#include "empathy-filter.h"
#include "empathy-chat-window.h"
#include "empathy-call-window.h"

#define GET_PRIV(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
               EMPATHY_TYPE_FILTER, EmpathyFilterPriv))

#define DEBUG_DOMAIN "Filter"

struct _EmpathyFilterPriv {
    GSList         *events;
    GHashTable     *accounts;
    gpointer        token;
    MissionControl *mc;
    GHashTable     *tubes;
};

static void empathy_filter_class_init (EmpathyFilterClass *klass);
static void empathy_filter_init       (EmpathyFilter      *filter);

G_DEFINE_TYPE (EmpathyFilter, empathy_filter, G_TYPE_OBJECT);

enum {
    PROP_0,
    PROP_TOP_EVENT,
};

typedef void (*FilterFunc) (EmpathyFilter *filter,
                gpointer       user_data);

typedef struct {
    EmpathyFilterEvent public;
    FilterFunc         func;
    gpointer           user_data;
} EmpathyFilterEventExt;

static guint
filter_channel_hash (gconstpointer key)
{
    TpProxy *channel = TP_PROXY (key);

    return g_str_hash (channel->object_path);
}

static gboolean
filter_channel_equal (gconstpointer a,
              gconstpointer b)
{
    TpProxy *channel_a = TP_PROXY (a);
    TpProxy *channel_b = TP_PROXY (b);

    return g_str_equal (channel_a->object_path, channel_b->object_path);
}

static void
filter_event_free (EmpathyFilterEventExt *event)
{
    g_free (event->public.icon_name);
    g_free (event->public.message);
    g_slice_free (EmpathyFilterEventExt, event);
}

static void
filter_emit_event (EmpathyFilter *filter,
           const gchar   *icon_name,
           const gchar   *message,
           FilterFunc     func,
           gpointer       user_data)
{
    EmpathyFilterPriv     *priv = GET_PRIV (filter);
    EmpathyFilterEventExt *event;

    empathy_debug (DEBUG_DOMAIN, "Emit event, icon_name=%s message='%s'",
               icon_name, message);

    event = g_slice_new0 (EmpathyFilterEventExt);
    event->func = func;
    event->user_data = user_data;
    event->public.icon_name = g_strdup (icon_name);
    event->public.message = g_strdup (message);

    priv->events = g_slist_append (priv->events, event);
    if (priv->events->data == event) {
        g_object_notify (G_OBJECT (filter), "top-event");
    }
}

void
empathy_filter_activate_event (EmpathyFilter      *filter,
                   EmpathyFilterEvent *event)
{
    EmpathyFilterPriv     *priv = GET_PRIV (filter);
    EmpathyFilterEventExt *event_ext;
    GSList                *l;
    gboolean               is_top;

    g_return_if_fail (EMPATHY_IS_FILTER (filter));
    g_return_if_fail (event != NULL);

    if (!(l = g_slist_find (priv->events, event))) {
        return;
    }

    empathy_debug (DEBUG_DOMAIN, "Activating event");

    event_ext = (EmpathyFilterEventExt*) event;
    if (event_ext->func) {
        event_ext->func (filter, event_ext->user_data);
    }

    is_top = (l == priv->events);
    priv->events = g_slist_delete_link (priv->events, l);
    if (is_top) {
        g_object_notify (G_OBJECT (filter), "top-event");
    }

    filter_event_free (event_ext);
}

EmpathyFilterEvent *
empathy_filter_get_top_event (EmpathyFilter *filter)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);

    g_return_val_if_fail (EMPATHY_IS_FILTER (filter), NULL);

    return priv->events ? priv->events->data : NULL;
}

static void
filter_chat_dispatch (EmpathyFilter *filter,
              gpointer       user_data)
{
    EmpathyTpChat *tp_chat = EMPATHY_TP_CHAT (user_data);
    McAccount     *account;
    EmpathyChat   *chat;
    const gchar   *id;

    id = empathy_tp_chat_get_id (tp_chat);
    account = empathy_tp_chat_get_account (tp_chat);
    chat = empathy_chat_window_find_chat (account, id);

    if (chat) {
        empathy_chat_set_tp_chat (chat, tp_chat);
    } else {
        chat = empathy_chat_new (tp_chat);
    }

    empathy_chat_window_present_chat (chat);
    g_object_unref (tp_chat);
}

static void
filter_chat_message_received_cb (EmpathyTpChat   *tp_chat,
                 EmpathyMessage  *message,
                 EmpathyFilter   *filter)
{
    EmpathyContact  *sender;
    gchar           *msg;

    g_signal_handlers_disconnect_by_func (tp_chat,
                          filter_chat_message_received_cb,
                          filter);

    sender = empathy_message_get_sender (message);
    msg = g_strdup_printf (_("New message from %s:\n%s"),
                   empathy_contact_get_name (sender),
                   empathy_message_get_body (message));

    filter_emit_event (filter, EMPATHY_IMAGE_NEW_MESSAGE, msg,
               filter_chat_dispatch, tp_chat);

    g_free (msg);
}

static void
filter_chat_handle_channel (EmpathyFilter *filter,
                TpChannel     *channel,
                gboolean       is_incoming)
{
    EmpathyTpChat *tp_chat;

    empathy_debug (DEBUG_DOMAIN, "New text channel to be filtered: %p",
               channel);

    tp_chat = empathy_tp_chat_new (channel, FALSE);
    if (is_incoming) {
        filter_chat_dispatch (filter, tp_chat);
    } else {
        g_signal_connect (tp_chat, "message-received",
                  G_CALLBACK (filter_chat_message_received_cb),
                  filter);
    }
}

static void
filter_call_dispatch (EmpathyFilter *filter,
              gpointer       user_data)
{
    EmpathyTpCall *call = EMPATHY_TP_CALL (user_data);

    empathy_call_window_new (call);
    g_object_unref (call);
}

static void
filter_call_contact_notify_cb (EmpathyTpCall *call,
                   gpointer       unused,
                   EmpathyFilter *filter)
{
    EmpathyContact *contact;
    gchar          *msg;

    g_object_get (call, "contact", &contact, NULL);
    if (!contact) {
        return;
    }

    empathy_contact_run_until_ready (contact,
                     EMPATHY_CONTACT_READY_NAME,
                     NULL);

    msg = g_strdup_printf (_("Incoming call from %s"),
                   empathy_contact_get_name (contact));

    filter_emit_event (filter, EMPATHY_IMAGE_VOIP, msg,
               filter_call_dispatch, call);

    g_free (msg);
    g_object_unref (contact);
}

static void
filter_call_handle_channel (EmpathyFilter *filter,
                TpChannel     *channel,
                gboolean       is_incoming)
{
    EmpathyTpCall *call;

    empathy_debug (DEBUG_DOMAIN, "New media channel to be filtered: %p",
               channel);

    call = empathy_tp_call_new (channel);
    if (is_incoming) {
        filter_call_dispatch (filter, call);
    } else {
        g_signal_connect (call, "notify::contact",
                  G_CALLBACK (filter_call_contact_notify_cb),
                  filter);  
    }
}

static void
filter_contact_list_subscribe (EmpathyFilter *filter,
                   gpointer       user_data)
{
    EmpathyContact *contact = EMPATHY_CONTACT (user_data);

    empathy_subscription_dialog_show (contact, NULL);
    g_object_unref (contact);
}

static void
filter_contact_list_local_pending_cb (EmpathyTpGroup *group,
                      EmpathyContact *contact,
                      EmpathyContact *actor,
                      guint           reason,
                      gchar          *message,
                      EmpathyFilter  *filter)
{
    GString *str;

    empathy_debug (DEBUG_DOMAIN, "New local pending contact");

    empathy_contact_run_until_ready (contact,
                     EMPATHY_CONTACT_READY_NAME,
                     NULL);

    str = g_string_new (NULL);
    g_string_printf (str, _("Subscription requested by %s"),
             empathy_contact_get_name (contact));   
    if (!G_STR_EMPTY (message)) {
        g_string_append_printf (str, _("\nMessage: %s"), message);
    }

    filter_emit_event (filter, GTK_STOCK_DIALOG_QUESTION, str->str,
               filter_contact_list_subscribe,
               g_object_ref (contact));

    g_string_free (str, TRUE);
}

static void
filter_contact_list_ready_cb (EmpathyTpGroup *group,
                  gpointer        unused,
                  EmpathyFilter  *filter)
{
    GList *pendings, *l;

    if (tp_strdiff ("publish", empathy_tp_group_get_name (group))) {
        g_object_unref (group);
        return;
    }

    empathy_debug (DEBUG_DOMAIN, "Publish contact list ready");

    g_signal_connect (group, "local-pending",
              G_CALLBACK (filter_contact_list_local_pending_cb),
              filter);

    pendings = empathy_tp_group_get_local_pendings (group);
    for (l = pendings; l; l = l->next) {
        EmpathyPendingInfo *info = l->data;

        filter_contact_list_local_pending_cb (group, info->member,
                              info->actor, info->reason,
                              info->message, filter);
        empathy_pending_info_free (info);
    }
    g_list_free (pendings);
}

static void
filter_tubes_async_cb (TpProxy      *channel,
               const GError *error,
               gpointer      user_data,
               GObject      *filter)
{
    if (error) {
        empathy_debug (DEBUG_DOMAIN, "Error %s: %s",
                   user_data, error->message);
    }
}

typedef struct {
    TpChannel *channel;
    gchar     *service;
    guint      type;
    guint      id;
} FilterTubeData;

static void
filter_tubes_dispatch (EmpathyFilter *filter,
               gpointer       user_data)
{
    FilterTubeData *data = user_data;
    TpProxy        *connection;
    gchar          *object_path;
    guint           handle_type;
    guint           handle;
    TpProxy        *thandler;
    gchar          *thandler_bus_name;
    gchar          *thandler_object_path;

    thandler_bus_name = empathy_tube_handler_build_bus_name (data->type, data->service);
    thandler_object_path = empathy_tube_handler_build_object_path (data->type, data->service);

    /* Create the proxy for the tube handler */
    thandler = g_object_new (TP_TYPE_PROXY,
                 "dbus-connection", tp_get_bus (),
                 "bus-name", thandler_bus_name,
                 "object-path", thandler_object_path,
                 NULL);
    tp_proxy_add_interface_by_id (thandler, EMP_IFACE_QUARK_TUBE_HANDLER);

    /* Give the tube to the handler */
    g_object_get (data->channel,
              "connection", &connection,
              "object-path", &object_path,
              "handle_type", &handle_type,
              "handle", &handle,
              NULL);

    emp_cli_tube_handler_call_handle_tube (thandler, -1,
                           connection->bus_name,
                           connection->object_path,
                           object_path, handle_type, handle,
                           data->id,
                           filter_tubes_async_cb,
                           "handling tube", NULL,
                           G_OBJECT (filter));

    g_free (thandler_bus_name);
    g_free (thandler_object_path);
    g_object_unref (thandler);
    g_object_unref (connection);
    g_free (object_path);

    g_free (data->service);
    g_object_unref (data->channel);
    g_slice_free (FilterTubeData, data);

}

static void
filter_tubes_new_tube_cb (TpChannel   *channel,
              guint        id,
              guint        initiator,
              guint        type,
              const gchar *service,
              GHashTable  *parameters,
              guint        state,
              gpointer     user_data,
              GObject     *filter)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);
    guint              number;
    gchar             *msg;
    FilterTubeData    *data;

    /* Increase tube count */
    number = GPOINTER_TO_UINT (g_hash_table_lookup (priv->tubes, channel));
    g_hash_table_replace (priv->tubes, g_object_ref (channel),
                  GUINT_TO_POINTER (++number));
    empathy_debug (DEBUG_DOMAIN, "Increased tube count for channel %p: %d",
               channel, number);

    /* We dispatch only local pending tubes */
    if (state != TP_TUBE_STATE_LOCAL_PENDING) {
        return;
    }

    data = g_slice_new (FilterTubeData);
    data->channel = g_object_ref (channel);
    data->service = g_strdup (service);
    data->type = type;
    data->id = id;
    msg = g_strdup_printf (_("Incoming tube for application %s"), service);
    filter_emit_event (EMPATHY_FILTER (filter), GTK_STOCK_EXECUTE, msg,
               filter_tubes_dispatch,
               data);
    g_free (msg);
}

static void
filter_tubes_list_tubes_cb (TpChannel       *channel,
                const GPtrArray *tubes,
                const GError    *error,
                gpointer         user_data,
                GObject         *filter)
{
    guint i;

    if (error) {
        empathy_debug (DEBUG_DOMAIN, "Error listing tubes: %s",
                   error->message);
        return;
    }

    for (i = 0; i < tubes->len; i++) {
        GValueArray *values;

        values = g_ptr_array_index (tubes, i);
        filter_tubes_new_tube_cb (channel,
                      g_value_get_uint (g_value_array_get_nth (values, 0)),
                      g_value_get_uint (g_value_array_get_nth (values, 1)),
                      g_value_get_uint (g_value_array_get_nth (values, 2)),
                      g_value_get_string (g_value_array_get_nth (values, 3)),
                      g_value_get_boxed (g_value_array_get_nth (values, 4)),
                      g_value_get_uint (g_value_array_get_nth (values, 5)),
                      user_data, filter);
    }
}

static void
filter_tubes_channel_invalidated_cb (TpProxy       *proxy,
                     guint          domain,
                     gint           code,
                     gchar         *message,
                     EmpathyFilter *filter)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);

    empathy_debug (DEBUG_DOMAIN, "Channel %p invalidated: %s", proxy, message);

    g_hash_table_remove (priv->tubes, proxy);
}

static void
filter_tubes_tube_closed_cb (TpChannel *channel,
                 guint      id,
                 gpointer   user_data,
                 GObject   *filter)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);
    guint              number;

    number = GPOINTER_TO_UINT (g_hash_table_lookup (priv->tubes, channel));
    if (number == 1) {
        empathy_debug (DEBUG_DOMAIN, "Ended tube count for channel %p, "
                   "closing channel", channel);
        tp_cli_channel_call_close (channel, -1, NULL, NULL, NULL, NULL);
    }
    else if (number > 1) {
        empathy_debug (DEBUG_DOMAIN, "Decrease tube count for channel %p: %d",
                   channel, number);
        g_hash_table_replace (priv->tubes, g_object_ref (channel),
                      GUINT_TO_POINTER (--number));
    }
}

static void
filter_tubes_handle_channel (EmpathyFilter *filter,
                 TpChannel     *channel,
                 gboolean       is_incoming)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);

    if (g_hash_table_lookup (priv->tubes, channel)) {
        return;
    }

    empathy_debug (DEBUG_DOMAIN, "Handling new channel");

    g_hash_table_insert (priv->tubes, g_object_ref (channel),
                 GUINT_TO_POINTER (0));

    g_signal_connect (channel, "invalidated",
              G_CALLBACK (filter_tubes_channel_invalidated_cb),
              filter);

    tp_cli_channel_type_tubes_connect_to_tube_closed (channel,
                              filter_tubes_tube_closed_cb,
                              NULL, NULL,
                              G_OBJECT (filter), NULL);
    tp_cli_channel_type_tubes_connect_to_new_tube (channel,
                               filter_tubes_new_tube_cb,
                               NULL, NULL,
                               G_OBJECT (filter), NULL);
    tp_cli_channel_type_tubes_call_list_tubes (channel, -1,
                           filter_tubes_list_tubes_cb,
                           NULL, NULL,
                           G_OBJECT (filter));
}

static void
filter_contact_list_destroy_cb (EmpathyTpGroup *group,
                EmpathyFilter  *filter)
{
    g_object_unref (group);
}

static void
filter_contact_list_handle_channel (EmpathyFilter *filter,
                    TpChannel     *channel,
                    gboolean       is_incoming)
{
    EmpathyTpGroup *group;

    group = empathy_tp_group_new (channel);
    g_signal_connect (group, "notify::ready",
              G_CALLBACK (filter_contact_list_ready_cb),
              filter);  
    g_signal_connect (group, "destroy",
              G_CALLBACK (filter_contact_list_destroy_cb),
              filter);
}

static void
filter_connection_invalidated_cb (TpConnection  *connection,
                  guint          domain,
                  gint           code,
                  gchar         *message,
                  EmpathyFilter *filter)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);
    GHashTableIter     iter;
    gpointer           key, value;

    empathy_debug (DEBUG_DOMAIN, "connection invalidated: %s", message);

    g_hash_table_iter_init (&iter, priv->accounts);
    while (g_hash_table_iter_next (&iter, &key, &value)) {
        if (value == connection) {
            g_hash_table_remove (priv->accounts, key);
            break;
        }
    }
}

typedef void (*HandleChannelFunc) (EmpathyFilter *filter,
                   TpChannel     *channel,
                   gboolean       is_incoming);

static void
filter_conection_new_channel_cb (TpConnection *connection,
                 const gchar  *object_path,
                 const gchar  *channel_type,
                 guint         handle_type,
                 guint         handle,
                 gboolean      suppress_handler,
                 gpointer      user_data,
                 GObject      *filter)
{
    HandleChannelFunc  func = NULL;
    TpChannel         *channel;
    gpointer           had_channels;
    
    had_channels = g_object_get_data (G_OBJECT (connection), "had-channels");
    if (had_channels == NULL) {
        return;
    }

    if (!tp_strdiff (channel_type, TP_IFACE_CHANNEL_TYPE_TEXT)) {
        func = filter_chat_handle_channel;
    }
    else if (!tp_strdiff (channel_type, TP_IFACE_CHANNEL_TYPE_STREAMED_MEDIA)) {
        func = filter_call_handle_channel;
    }
    else if (!tp_strdiff (channel_type, TP_IFACE_CHANNEL_TYPE_CONTACT_LIST)) {
        func = filter_contact_list_handle_channel;
    } if (!tp_strdiff (channel_type, TP_IFACE_CHANNEL_TYPE_TUBES)) {
        func = filter_tubes_handle_channel;
    } else {
        empathy_debug (DEBUG_DOMAIN, "Unknown channel type %s",
                   channel_type);
        return;
    }

    channel = tp_channel_new (connection, object_path, channel_type,
                  handle_type, handle, NULL);
    tp_channel_run_until_ready (channel, NULL, NULL);

    /* We abuse of suppress_handler, TRUE means OUTGOING */
    func (EMPATHY_FILTER (filter), channel, suppress_handler);

    g_object_unref (channel);
}

static void
filter_connection_list_channels_cb (TpConnection    *connection,
                    const GPtrArray *channels,
                    const GError    *error,
                    gpointer         user_data,
                    GObject         *filter)
{
    guint i;

    g_object_set_data (G_OBJECT (connection), "had-channels",
               GUINT_TO_POINTER (1));

    for (i = 0; i < channels->len; i++) {
        GValueArray *values;

        values = g_ptr_array_index (channels, i);
        filter_conection_new_channel_cb (connection,
            g_value_get_boxed (g_value_array_get_nth (values, 0)),
            g_value_get_string (g_value_array_get_nth (values, 1)),
            g_value_get_uint (g_value_array_get_nth (values, 2)),
            g_value_get_uint (g_value_array_get_nth (values, 3)),
            TRUE, user_data, filter);
    }
}

static void
filter_connection_ready_cb (TpConnection  *connection,
                gpointer       unused,
                EmpathyFilter *filter)
{
    empathy_debug (DEBUG_DOMAIN, "Connection ready, accepting new channels");

    tp_cli_connection_connect_to_new_channel (connection,
                          filter_conection_new_channel_cb,
                          NULL, NULL,
                          G_OBJECT (filter), NULL);
    tp_cli_connection_call_list_channels (connection, -1,
                          filter_connection_list_channels_cb,
                          NULL, NULL,
                          G_OBJECT (filter));
}

static void
filter_update_account (EmpathyFilter *filter,
               McAccount     *account)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);
    TpConnection      *connection;
    gboolean           ready;

    connection = g_hash_table_lookup (priv->accounts, account);
    if (connection) {
        return;
    }

    connection = mission_control_get_tpconnection (priv->mc, account, NULL);
    if (!connection) {
        return;
    }

    g_hash_table_insert (priv->accounts, g_object_ref (account), connection);
    g_signal_connect (connection, "invalidated",
              G_CALLBACK (filter_connection_invalidated_cb),
              filter);

    g_object_get (connection, "connection-ready", &ready, NULL);
    if (ready) {
        filter_connection_ready_cb (connection, NULL, filter);
    } else {
        g_signal_connect (connection, "notify::connection-ready",
                  G_CALLBACK (filter_connection_ready_cb),
                  filter);
    }
}

static void
filter_status_changed_cb (MissionControl           *mc,
              TpConnectionStatus        status,
              McPresence                presence,
              TpConnectionStatusReason  reason,
              const gchar              *unique_name,
              EmpathyFilter            *filter)
{
    McAccount *account;

    account = mc_account_lookup (unique_name);
    filter_update_account (filter, account);
    g_object_unref (account);
}

static void
filter_finalize (GObject *object)
{
    EmpathyFilterPriv *priv = GET_PRIV (object);

    empathy_disconnect_account_status_changed (priv->token);
    g_object_unref (priv->mc);

    g_slist_foreach (priv->events, (GFunc) filter_event_free, NULL);
    g_slist_free (priv->events);

    g_hash_table_destroy (priv->accounts);
    g_hash_table_destroy (priv->tubes);
}

static void
filter_get_property (GObject    *object,
             guint       param_id,
             GValue     *value,
             GParamSpec *pspec)
{
    EmpathyFilterPriv *priv = GET_PRIV (object);

    switch (param_id) {
    case PROP_TOP_EVENT:
        g_value_set_pointer (value, priv->events ? priv->events->data : NULL);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
        break;
    };
}

static void
empathy_filter_class_init (EmpathyFilterClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    object_class->finalize = filter_finalize;
    object_class->get_property = filter_get_property;

    g_object_class_install_property (object_class,
                     PROP_TOP_EVENT,
                     g_param_spec_pointer ("top-event",
                                   "The top event",
                                   "The first event in the events list",
                                   G_PARAM_READABLE));

    g_type_class_add_private (object_class, sizeof (EmpathyFilterPriv));
}

static void
empathy_filter_init (EmpathyFilter *filter)
{
    EmpathyFilterPriv *priv = GET_PRIV (filter);
    GList             *accounts, *l;

    priv->tubes = g_hash_table_new_full (filter_channel_hash,
                         filter_channel_equal,
                         g_object_unref, NULL);

    priv->mc = empathy_mission_control_new ();
    priv->token = empathy_connect_to_account_status_changed (priv->mc,
        G_CALLBACK (filter_status_changed_cb),
        filter, NULL);

    priv->accounts = g_hash_table_new_full (empathy_account_hash,
                        empathy_account_equal,
                        g_object_unref,
                        g_object_unref);
    accounts = mc_accounts_list_by_enabled (TRUE);
    for (l = accounts; l; l = l->next) {
        filter_update_account (filter, l->data);
        g_object_unref (l->data);
    }
    g_list_free (accounts);
}

EmpathyFilter *
empathy_filter_new (void)
{
    static EmpathyFilter *filter = NULL;

    if (!filter) {
        filter = g_object_new (EMPATHY_TYPE_FILTER, NULL);
        g_object_add_weak_pointer (G_OBJECT (filter), (gpointer) &filter);
    } else {
        g_object_ref (filter);
    }

    return filter;
}