path: root/plugins/publish-calendar/publish-format-ical.c

/*
 * Authors: David Trowbridge <trowbrds@cs.colorado.edu>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 * 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#include <string.h>
#include <gconf/gconf-client.h>
#include <libedataserver/e-source.h>
#include <libedataserver/e-source-list.h>
#include <libecal/e-cal.h>
#include <libecal/e-cal-util.h>
#include <calendar/common/authentication.h>
#include "publish-format-ical.h"

typedef struct {
    GHashTable *zones;
    ECal *ecal;
} CompTzData;

 static void
insert_tz_comps (icalparameter *param, void *cb_data)
{
    const char *tzid;
    CompTzData *tdata = cb_data;
    icaltimezone *zone = NULL;
    icalcomponent *tzcomp;
    GError *error = NULL;

    tzid = icalparameter_get_tzid (param);

    if (g_hash_table_lookup (tdata->zones, tzid))
        return;

    if (!e_cal_get_timezone (tdata->ecal, tzid, &zone, &error)) {
        g_warning ("Could not get the timezone information for %s :  %s \n", tzid, error->message);
        g_error_free (error);
        return;
    }

    tzcomp = icalcomponent_new_clone (icaltimezone_get_component (zone));
    g_hash_table_insert (tdata->zones, (gpointer) tzid, (gpointer) tzcomp);
}

static void
append_tz_to_comp (gpointer key, gpointer value, icalcomponent *toplevel)
{
    icalcomponent_add_component (toplevel, (icalcomponent *) value);
}

static gboolean
write_calendar (gchar *uid, ESourceList *source_list, GOutputStream *stream)
{
    ESource *source;
    ECal *client = NULL;
    GError *error = NULL;
    GList *objects;
    icalcomponent *top_level;
    gboolean res = FALSE;

    source = e_source_list_peek_source_by_uid (source_list, uid);
    if (source)
        client = auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_EVENT);
    if (!client) {
        g_warning (G_STRLOC ": Could not publish calendar: Calendar backend no longer exists");
        return FALSE;
    }

    if (!e_cal_open (client, TRUE, &error)) {
        if (error) {
            g_warning ("%s", error->message);
            g_error_free (error);
        }
        g_object_unref (client);
        return FALSE;
    }

    top_level = e_cal_util_new_top_level ();
    error = NULL;

    if (e_cal_get_object_list (client, "#t", &objects, &error)) {
        char *ical_string;
        CompTzData tdata;

        tdata.zones = g_hash_table_new (g_str_hash, g_str_equal);
        tdata.ecal = client;

        while (objects) {
            icalcomponent *icalcomp = objects->data;
            icalcomponent_foreach_tzid (icalcomp, insert_tz_comps, &tdata);
            icalcomponent_add_component (top_level, icalcomp);
            objects = g_list_remove (objects, icalcomp);
        }

        g_hash_table_foreach (tdata.zones, (GHFunc) append_tz_to_comp, top_level);

        g_hash_table_destroy (tdata.zones);
        tdata.zones = NULL;

        ical_string = icalcomponent_as_ical_string (top_level);
        res = g_output_stream_write_all (stream, ical_string, strlen (ical_string), NULL, NULL, &error);
        g_free (ical_string);
    }

    g_object_unref (client);

    if (error) {
        g_warning ("%s", error->message);
        g_error_free (error);
    }

    return res;
}

void
publish_calendar_as_ical (GOutputStream *stream, EPublishUri *uri)
{
    GSList *l;
    ESourceList *source_list;
    GConfClient *gconf_client;

    gconf_client = gconf_client_get_default ();

    /* events */
    source_list = e_source_list_new_for_gconf (gconf_client, "/apps/evolution/calendar/sources");
    l = uri->events;
    while (l) {
        gchar *uid = l->data;
        if (!write_calendar (uid, source_list, stream))
            break;
        l = g_slist_next (l);
    }
    g_object_unref (source_list);

    g_object_unref (gconf_client);
}