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path: root/libempathy/empathy-dispatcher.c
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/* -*- 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/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 "empathy-dispatcher.h"
#include "empathy-utils.h"
#include "empathy-tube-handler.h"
#include "empathy-contact-factory.h"

#define DEBUG_FLAG EMPATHY_DEBUG_DISPATCHER
#include <libempathy/empathy-debug.h>

#define GET_PRIV(obj) EMPATHY_GET_PRIV (obj, EmpathyDispatcher)
typedef struct {
    GHashTable     *connections;
    gpointer        token;
    MissionControl *mc;
    GHashTable     *tubes;
} EmpathyDispatcherPriv;

G_DEFINE_TYPE (EmpathyDispatcher, empathy_dispatcher, G_TYPE_OBJECT);

enum {
    DISPATCH_CHANNEL,
    FILTER_CHANNEL,
    FILTER_TUBE,
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL];
static EmpathyDispatcher *dispatcher = NULL;

void
empathy_dispatcher_channel_process (EmpathyDispatcher *dispatcher,
                    TpChannel         *channel)
{
    g_signal_emit (dispatcher, signals[DISPATCH_CHANNEL], 0, channel);
}

typedef struct {
    EmpathyDispatcherTube  public;
    EmpathyContactFactory *factory;
    gchar                 *bus_name;
    gchar                 *object_path;
    guint                  ref_count;
    gboolean               handled;
} DispatcherTube;

GType
empathy_dispatcher_tube_get_type (void)
{
    static GType type_id = 0;

    if (!type_id) {
        type_id = g_boxed_type_register_static ("EmpathyDispatcherTube",
                            (GBoxedCopyFunc) empathy_dispatcher_tube_ref,
                            (GBoxedFreeFunc) empathy_dispatcher_tube_unref);
    }

    return type_id;
}

EmpathyDispatcherTube *
empathy_dispatcher_tube_ref (EmpathyDispatcherTube *data)
{
    DispatcherTube *tube = (DispatcherTube*) data;

    g_return_val_if_fail (tube != NULL, NULL);

    tube->ref_count++;

    return data;
}

void
empathy_dispatcher_tube_unref (EmpathyDispatcherTube *data)
{
    DispatcherTube *tube = (DispatcherTube*) data;

    g_return_if_fail (tube != NULL);

    if (--tube->ref_count == 0) {
        if (!tube->handled) {
            DEBUG ("Tube can't be handled, closing");
            tp_cli_channel_type_tubes_call_close_tube (tube->public.channel, -1,
                                   tube->public.id,
                                   NULL, NULL, NULL,
                                   NULL);
        }

        g_free (tube->bus_name);
        g_free (tube->object_path);
        g_object_unref (tube->factory);
        g_object_unref (tube->public.channel);
        g_object_unref (tube->public.initiator);
        g_slice_free (DispatcherTube, tube);
    }
}

static void
dispatcher_tubes_handle_tube_cb (TpProxy      *channel,
                 const GError *error,
                 gpointer      user_data,
                 GObject      *dispatcher)
{
    DispatcherTube *tube = user_data;

    if (error) {
        DEBUG ("Error: %s", error->message);
    } else {
        tube->handled = TRUE;
    }
}

void
empathy_dispatcher_tube_process (EmpathyDispatcher     *dispatcher,
                 EmpathyDispatcherTube *user_data)
{
    DispatcherTube *tube = (DispatcherTube*) user_data;

    if (tube->public.activatable) {
        TpProxy *connection;
        TpProxy *thandler;
        gchar   *object_path;
        guint    handle_type;
        guint    handle;

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

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

        DEBUG ("Dispatching tube");
        emp_cli_tube_handler_call_handle_tube (thandler, -1,
                               connection->bus_name,
                               connection->object_path,
                               object_path, handle_type,
                               handle, tube->public.id,
                               dispatcher_tubes_handle_tube_cb,
                               empathy_dispatcher_tube_ref (user_data),
                               (GDestroyNotify) empathy_dispatcher_tube_unref,
                               G_OBJECT (dispatcher));

        g_object_unref (thandler);
        g_object_unref (connection);
        g_free (object_path);
    }
}

static void
dispatcher_tubes_new_tube_cb (TpChannel   *channel,
                  guint        id,
                  guint        initiator,
                  guint        type,
                  const gchar *service,
                  GHashTable  *parameters,
                  guint        state,
                  gpointer     user_data,
                  GObject     *dispatcher)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (dispatcher);
    static TpDBusDaemon   *daemon = NULL;
    DispatcherTube        *tube;
    McAccount             *account;
    guint                  number;
    gchar                **names;
    gboolean               running = FALSE;
    GError                *error = NULL;

    /* 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));
    DEBUG ("Increased tube count for channel %p: %d", channel, number);

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

    if (!daemon) {
        daemon = tp_dbus_daemon_new (tp_get_bus ());
    }

    account = empathy_channel_get_account (channel);
    tube = g_slice_new (DispatcherTube);
    tube->ref_count = 1;
    tube->handled = FALSE;
    tube->factory = empathy_contact_factory_new ();
    tube->bus_name = empathy_tube_handler_build_bus_name (type, service);
    tube->object_path = empathy_tube_handler_build_object_path (type, service);
    tube->public.activatable = FALSE;
    tube->public.id = id;
    tube->public.channel = g_object_ref (channel);
    tube->public.initiator = empathy_contact_factory_get_from_handle (tube->factory,
                                      account,
                                      initiator);
    g_object_unref (account);

    /* Check if that bus-name has an owner, if it has one that means the
     * app is already running and we can directly give the channel. */
    tp_cli_dbus_daemon_run_name_has_owner (daemon, -1, tube->bus_name,
                           &running, NULL, NULL);
    if (running) {
        DEBUG ("Tube handler running");
        tube->public.activatable = TRUE;
        empathy_dispatcher_tube_process (EMPATHY_DISPATCHER (dispatcher),
                         (EmpathyDispatcherTube*) tube);
        empathy_dispatcher_tube_unref ((EmpathyDispatcherTube*) tube);
        return;
    }

    /* Check if that bus-name is activatable, if not that means the
     * application needed to handle this tube isn't installed. */
    if (!tp_cli_dbus_daemon_run_list_activatable_names (daemon, -1,
                                &names, &error,
                                NULL)) {
        DEBUG ("Error listing activatable names: %s", error->message);
        g_clear_error (&error);
    } else {
        gchar **name;

        for (name = names; *name; name++) {
            if (!tp_strdiff (*name, tube->bus_name)) {
                tube->public.activatable = TRUE;
                break;
            }
        }
        g_strfreev (names);
    }

    g_signal_emit (dispatcher, signals[FILTER_TUBE], 0, tube);
    empathy_dispatcher_tube_unref ((EmpathyDispatcherTube*) tube);
}

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

    if (error) {
        DEBUG ("Error: %s", error->message);
        return;
    }

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

        values = g_ptr_array_index (tubes, i);
        dispatcher_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, dispatcher);
    }
}

static void
dispatcher_tubes_channel_invalidated_cb (TpProxy       *proxy,
                     guint          domain,
                     gint           code,
                     gchar         *message,
                     EmpathyDispatcher *dispatcher)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (dispatcher);

    DEBUG ("Error: %s", message);

    g_hash_table_remove (priv->tubes, proxy);
}

static void
dispatcher_tubes_tube_closed_cb (TpChannel *channel,
                 guint      id,
                 gpointer   user_data,
                 GObject   *dispatcher)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (dispatcher);
    guint                  number;

    number = GPOINTER_TO_UINT (g_hash_table_lookup (priv->tubes, channel));
    if (number == 1) {
        DEBUG ("No more tube, closing channel");
        tp_cli_channel_call_close (channel, -1, NULL, NULL, NULL, NULL);
    }
    else if (number > 1) {
        DEBUG ("Decrease tube count: %d", number);
        g_hash_table_replace (priv->tubes, g_object_ref (channel),
                      GUINT_TO_POINTER (--number));
    }
}

static void
dispatcher_tubes_handle_channel (EmpathyDispatcher *dispatcher,
                 TpChannel         *channel)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (dispatcher);

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

    DEBUG ("Handling new channel");

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

    g_signal_connect (channel, "invalidated",
              G_CALLBACK (dispatcher_tubes_channel_invalidated_cb),
              dispatcher);

    tp_cli_channel_type_tubes_connect_to_tube_closed (channel,
                              dispatcher_tubes_tube_closed_cb,
                              NULL, NULL,
                              G_OBJECT (dispatcher), NULL);
    tp_cli_channel_type_tubes_connect_to_new_tube (channel,
                               dispatcher_tubes_new_tube_cb,
                               NULL, NULL,
                               G_OBJECT (dispatcher), NULL);
    tp_cli_channel_type_tubes_call_list_tubes (channel, -1,
                           dispatcher_tubes_list_tubes_cb,
                           NULL, NULL,
                           G_OBJECT (dispatcher));
}

static void
dispatcher_connection_invalidated_cb (TpConnection  *connection,
                      guint          domain,
                      gint           code,
                      gchar         *message,
                      EmpathyDispatcher *dispatcher)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (dispatcher);
    GHashTableIter         iter;
    gpointer               key, value;

    DEBUG ("Error: %s", message);

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

static void
dispatcher_connection_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      *object)
{
    EmpathyDispatcher *dispatcher = EMPATHY_DISPATCHER (object);
    TpChannel         *channel;
    gpointer           had_channels;

    had_channels = g_object_get_data (G_OBJECT (connection), "had-channels");
    if (had_channels == NULL) {
        /* ListChannels didn't return yet, return to avoid duplicate
         * dispatching */
        return;
    }

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

    if (!tp_strdiff (channel_type, TP_IFACE_CHANNEL_TYPE_TUBES)) {
        dispatcher_tubes_handle_channel (dispatcher, channel);
    }

    if (suppress_handler) {
        g_signal_emit (dispatcher, signals[DISPATCH_CHANNEL], 0, channel);
    } else {
        g_signal_emit (dispatcher, signals[FILTER_CHANNEL], 0, channel);
    }

    g_object_unref (channel);
}

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

    if (error) {
        DEBUG ("Error: %s", error->message);
        return;
    }

    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);
        dispatcher_connection_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)),
            FALSE, user_data, dispatcher);
    }
}

static void
dispatcher_connection_advertise_capabilities_cb (TpConnection    *connection,
                         const GPtrArray *capabilities,
                         const GError    *error,
                         gpointer         user_data,
                         GObject         *dispatcher)
{
    if (error) {
        DEBUG ("Error: %s", error->message);
    }
}

static void
dispatcher_connection_ready_cb (TpConnection  *connection,
                const GError  *error,
                gpointer       dispatcher)
{
    GPtrArray   *capabilities;
    GType        cap_type;
    GValue       cap = {0, };
    const gchar *remove = NULL;

    if (error) {
        dispatcher_connection_invalidated_cb (connection,
                              error->domain,
                              error->code,
                              error->message,
                              dispatcher);
        return;
    }

    g_signal_connect (connection, "invalidated",
              G_CALLBACK (dispatcher_connection_invalidated_cb),
              dispatcher);
    tp_cli_connection_connect_to_new_channel (connection,
                          dispatcher_connection_new_channel_cb,
                          NULL, NULL,
                          G_OBJECT (dispatcher), NULL);
    tp_cli_connection_call_list_channels (connection, -1,
                          dispatcher_connection_list_channels_cb,
                          NULL, NULL,
                          G_OBJECT (dispatcher));

    /* Advertise VoIP capabilities */
    capabilities = g_ptr_array_sized_new (1);
    cap_type = dbus_g_type_get_struct ("GValueArray", G_TYPE_STRING,
                       G_TYPE_UINT, G_TYPE_INVALID);
    g_value_init (&cap, cap_type);
    g_value_take_boxed (&cap, dbus_g_type_specialized_construct (cap_type));
    dbus_g_type_struct_set (&cap,
                0, TP_IFACE_CHANNEL_TYPE_STREAMED_MEDIA,
                1, TP_CHANNEL_MEDIA_CAPABILITY_AUDIO |
                   TP_CHANNEL_MEDIA_CAPABILITY_VIDEO |
                   TP_CHANNEL_MEDIA_CAPABILITY_NAT_TRAVERSAL_STUN  |
                   TP_CHANNEL_MEDIA_CAPABILITY_NAT_TRAVERSAL_GTALK_P2P,
                G_MAXUINT);
    g_ptr_array_add (capabilities, g_value_get_boxed (&cap));

    tp_cli_connection_interface_capabilities_call_advertise_capabilities (
        connection, -1,
        capabilities, &remove,
        dispatcher_connection_advertise_capabilities_cb,
        NULL, NULL, G_OBJECT (dispatcher));
    /* FIXME: Is that leaked? */
}

static void
dispatcher_update_account (EmpathyDispatcher *dispatcher,
               McAccount         *account)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (dispatcher);
    TpConnection          *connection;

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

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

    g_hash_table_insert (priv->connections, g_object_ref (account), connection);
    tp_connection_call_when_ready (connection,
                       dispatcher_connection_ready_cb,
                       dispatcher);
}

static void
dispatcher_status_changed_cb (MissionControl           *mc,
                  TpConnectionStatus        status,
                  McPresence                presence,
                  TpConnectionStatusReason  reason,
                  const gchar              *unique_name,
                  EmpathyDispatcher            *dispatcher)
{
    McAccount *account;

    account = mc_account_lookup (unique_name);
    dispatcher_update_account (dispatcher, account);
    g_object_unref (account);
}

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

    return g_str_hash (channel->object_path);
}

static gboolean
dispatcher_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
dispatcher_finalize (GObject *object)
{
    EmpathyDispatcherPriv *priv = GET_PRIV (object);

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

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

static void
empathy_dispatcher_class_init (EmpathyDispatcherClass *klass)
{
    GObjectClass *object_class = G_OBJECT_CLASS (klass);

    object_class->finalize = dispatcher_finalize;

    signals[DISPATCH_CHANNEL] =
        g_signal_new ("dispatch-channel",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, TP_TYPE_CHANNEL);
    signals[FILTER_CHANNEL] =
        g_signal_new ("filter-channel",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__OBJECT,
                  G_TYPE_NONE,
                  1, TP_TYPE_CHANNEL);
    signals[FILTER_TUBE] =
        g_signal_new ("filter-tube",
                  G_TYPE_FROM_CLASS (klass),
                  G_SIGNAL_RUN_LAST,
                  0,
                  NULL, NULL,
                  g_cclosure_marshal_VOID__BOXED,
                  G_TYPE_NONE,
                  1, EMPATHY_TYPE_DISPATCHER_TUBE);

    g_type_class_add_private (object_class, sizeof (EmpathyDispatcherPriv));
}

static void
empathy_dispatcher_init (EmpathyDispatcher *dispatcher)
{
    GList                 *accounts, *l;
    EmpathyDispatcherPriv *priv = G_TYPE_INSTANCE_GET_PRIVATE (dispatcher,
        EMPATHY_TYPE_DISPATCHER, EmpathyDispatcherPriv);

    dispatcher->priv = priv;
    priv->tubes = g_hash_table_new_full (dispatcher_channel_hash,
                         dispatcher_channel_equal,
                         g_object_unref, NULL);

    priv->mc = empathy_mission_control_new ();
    priv->token = empathy_connect_to_account_status_changed (priv->mc,
        G_CALLBACK (dispatcher_status_changed_cb),
        dispatcher, NULL);

    priv->connections = 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) {
        dispatcher_update_account (dispatcher, l->data);
        g_object_unref (l->data);
    }
    g_list_free (accounts);
}

EmpathyDispatcher *
empathy_dispatcher_new (void)
{
    if (!dispatcher) {
        dispatcher = g_object_new (EMPATHY_TYPE_DISPATCHER, NULL);
        g_object_add_weak_pointer (G_OBJECT (dispatcher), (gpointer) &dispatcher);
    } else {
        g_object_ref (dispatcher);
    }

    return dispatcher;
}