path: root/calendar/gui/itip-utils.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Authors:
 *  JP Rosevear <jpr@ximian.com>
 *
 * 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 version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * 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
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <glib/gi18n.h>
#include <libedataserver/e-time-utils.h>
#include <gtk/gtk.h>
#include <libical/ical.h>
#include <e-util/e-dialog-utils.h>
#include <libecal/e-cal-time-util.h>
#include <libecal/e-cal-util.h>
#include <libsoup/soup.h>
#include "calendar-config.h"
#include "itip-utils.h"
#include <time.h>

#include <composer/e-msg-composer.h>
#include <mail/em-composer-utils.h>
#include <camel/camel-mime-filter-tohtml.h>

static gchar *itip_methods[] = {
    "PUBLISH",
    "REQUEST",
    "REPLY",
    "ADD",
    "CANCEL",
    "RERESH",
    "COUNTER",
    "DECLINECOUNTER"
};

static icalproperty_method itip_methods_enum[] = {
    ICAL_METHOD_PUBLISH,
    ICAL_METHOD_REQUEST,
    ICAL_METHOD_REPLY,
    ICAL_METHOD_ADD,
    ICAL_METHOD_CANCEL,
    ICAL_METHOD_REFRESH,
    ICAL_METHOD_COUNTER,
    ICAL_METHOD_DECLINECOUNTER,
};

static EAccountList *accounts = NULL;

EAccountList *
itip_addresses_get (void)
{
    if (accounts == NULL) {
        GConfClient *gconf_client = gconf_client_get_default ();
        accounts = e_account_list_new (gconf_client);
        g_object_unref (gconf_client);
    }

    return accounts;
}

EAccount *
itip_addresses_get_default (void)
{
    return (EAccount *)e_account_list_get_default(itip_addresses_get());
}

gboolean
itip_organizer_is_user (ECalComponent *comp, ECal *client)
{
    ECalComponentOrganizer organizer;
    const char *strip;
    gboolean user_org = FALSE;

    if (!e_cal_component_has_organizer (comp) || e_cal_get_static_capability (client, CAL_STATIC_CAPABILITY_NO_ORGANIZER))
        return FALSE;

    e_cal_component_get_organizer (comp, &organizer);
    if (organizer.value != NULL) {

        strip = itip_strip_mailto (organizer.value);

        if (e_cal_get_static_capability (client, CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS)) {
            char *email = NULL;

            if (e_cal_get_cal_address (client, &email, NULL) && !g_ascii_strcasecmp (email, strip)) {
                g_free (email);

                return TRUE;
            }

            g_free (email);
            return FALSE;
        }

        user_org = e_account_list_find(itip_addresses_get(), E_ACCOUNT_FIND_ID_ADDRESS, strip) != NULL;
    }

    return user_org;
}

gboolean
itip_sentby_is_user (ECalComponent *comp)
{
    ECalComponentOrganizer organizer;
    const char *strip;
    gboolean user_sentby = FALSE;

    if (!e_cal_component_has_organizer (comp))
        return FALSE;

    e_cal_component_get_organizer (comp, &organizer);
    if (organizer.sentby != NULL) {
        strip = itip_strip_mailto (organizer.sentby);
        user_sentby = e_account_list_find(itip_addresses_get(), E_ACCOUNT_FIND_ID_ADDRESS, strip) != NULL;
    }

    return user_sentby;
}

static ECalComponentAttendee *
get_attendee (GSList *attendees, char *address)
{
    GSList *l;

    if (!address)
        return NULL;

    for (l = attendees; l; l = l->next) {
        ECalComponentAttendee *attendee = l->data;

        if (!g_ascii_strcasecmp (itip_strip_mailto (attendee->value), address)) {
            return attendee;
        }
    }

    return NULL;
}

static ECalComponentAttendee *
get_attendee_if_attendee_sentby_is_user (GSList *attendees, char *address)
{
    GSList *l;

    for (l = attendees; l; l = l->next) {
        ECalComponentAttendee *attendee = l->data;

        if (attendee->sentby && g_str_equal (itip_strip_mailto (attendee->sentby), address)) {
            return attendee;
        }
    }

    return NULL;
}

static char *
html_new_lines_for (const char *string)
{
    gchar **lines;
    gchar *joined;

    lines = g_strsplit_set (string, "\n", -1);
    joined = g_strjoinv ("<br>", lines);
    g_strfreev (lines);

    return joined;
}

char *
itip_get_comp_attendee (ECalComponent *comp, ECal *client)
{
    GSList *attendees;
    EAccountList *al;
    EAccount *a;
    EIterator *it;
    ECalComponentAttendee *attendee = NULL;
    char *address = NULL;

    e_cal_component_get_attendee_list (comp, &attendees);
    al = itip_addresses_get ();

    if (client)
        e_cal_get_cal_address (client, &address, NULL);

    if (address && *address) {
        attendee = get_attendee (attendees, address);

        if (attendee) {
            char *user_email = g_strdup (itip_strip_mailto (attendee->value));

            e_cal_component_free_attendee_list (attendees);
            g_free (address);
            return user_email;
        }

        attendee = get_attendee_if_attendee_sentby_is_user (attendees, address);

        if (attendee) {
            char *user_email = g_strdup (itip_strip_mailto (attendee->sentby));

            e_cal_component_free_attendee_list (attendees);
            g_free (address);
            return user_email;
        }

        g_free (address);
        address = NULL;
    }

    for (it = e_list_get_iterator((EList *)al);
            e_iterator_is_valid(it);
            e_iterator_next(it)) {
        a = (EAccount *) e_iterator_get(it);

        if (!a->enabled)
            continue;

        attendee = get_attendee (attendees, a->id->address);
        if (attendee) {
            char *user_email = g_strdup (itip_strip_mailto (attendee->value));

            e_cal_component_free_attendee_list (attendees);
            return user_email;
        }

        /* If the account was not found in the attendees list, then let's
        check the 'sentby' fields of the attendees if we can find the account */
        attendee = get_attendee_if_attendee_sentby_is_user (attendees, a->id->address);
        if (attendee) {
            char *user_email = g_strdup (itip_strip_mailto (attendee->sentby));

            e_cal_component_free_attendee_list (attendees);
            return user_email;
        }
    }

    /* We could not find the attendee in the component, so just give the default
    account address if the email address is not set in the backend */
    /* FIXME do we have a better way ? */
    a = itip_addresses_get_default ();
    address = g_strdup ((a != NULL) ? a->id->address : "");

    e_cal_component_free_attendee_list (attendees);
    return address;
}

const gchar *
itip_strip_mailto (const gchar *address)
{
    if (address == NULL)
        return NULL;

    if (!g_ascii_strncasecmp (address, "mailto:", 7))
        address += 7;

    return address;
}

static char *
get_label (struct icaltimetype *tt)
{
        char buffer[1000];
        struct tm tmp_tm;

    tmp_tm = icaltimetype_to_tm (tt);
        e_time_format_date_and_time (&tmp_tm,
                                     calendar_config_get_24_hour_format (),
                                     FALSE, FALSE,
                                     buffer, 1000);

        return g_strdup (buffer);
}

typedef struct {
    GHashTable *tzids;
    icalcomponent *icomp;
    ECal *client;
    icalcomponent *zones;
} ItipUtilTZData;


static void
foreach_tzid_callback (icalparameter *param, gpointer data)
{
    ItipUtilTZData *tz_data = data;
    const char *tzid;
    icaltimezone *zone = NULL;
    icalcomponent *vtimezone_comp;

    /* Get the TZID string from the parameter. */
    tzid = icalparameter_get_tzid (param);
    if (!tzid || g_hash_table_lookup (tz_data->tzids, tzid))
        return;

    /* Look for the timezone */
    if (tz_data->zones != NULL)
        zone = icalcomponent_get_timezone (tz_data->zones, tzid);
    if (zone == NULL)
        zone = icaltimezone_get_builtin_timezone_from_tzid (tzid);
    if (zone == NULL && tz_data->client != NULL)
        e_cal_get_timezone (tz_data->client, tzid, &zone, NULL);
    if (zone == NULL)
        return;

    /* Convert it to a string and add it to the hash. */
    vtimezone_comp = icaltimezone_get_component (zone);
    if (!vtimezone_comp)
        return;

    icalcomponent_add_component (tz_data->icomp, icalcomponent_new_clone (vtimezone_comp));
    g_hash_table_insert (tz_data->tzids, (char *)tzid, (char *)tzid);
}

static icalcomponent *
comp_toplevel_with_zones (ECalComponentItipMethod method, ECalComponent *comp, ECal *client, icalcomponent *zones)
{
    icalcomponent *top_level, *icomp;
    icalproperty *prop;
    icalvalue *value;
    ItipUtilTZData tz_data;

    top_level = e_cal_util_new_top_level ();

    prop = icalproperty_new (ICAL_METHOD_PROPERTY);
    value = icalvalue_new_method (itip_methods_enum[method]);
    icalproperty_set_value (prop, value);
    icalcomponent_add_property (top_level, prop);

    icomp = e_cal_component_get_icalcomponent (comp);
    icomp = icalcomponent_new_clone (icomp);

    tz_data.tzids = g_hash_table_new (g_str_hash, g_str_equal);
    tz_data.icomp = top_level;
    tz_data.client = client;
    tz_data.zones = zones;
    icalcomponent_foreach_tzid (icomp, foreach_tzid_callback, &tz_data);
    g_hash_table_destroy (tz_data.tzids);

    icalcomponent_add_component (top_level, icomp);

    return top_level;
}

static gboolean
users_has_attendee (GList *users, const char *address)
{
    GList *l;

    for (l = users; l != NULL; l = l->next) {
        if (!g_ascii_strcasecmp (address, l->data))
            return TRUE;
    }

    return FALSE;
}

static gchar *
comp_from (ECalComponentItipMethod method, ECalComponent *comp)
{
    ECalComponentOrganizer organizer;
    ECalComponentAttendee *attendee;
    GSList *attendees;
    gchar *from;
    char *sender = NULL;

    switch (method) {
    case E_CAL_COMPONENT_METHOD_PUBLISH:
        return NULL;

    case E_CAL_COMPONENT_METHOD_REQUEST:
        return itip_get_comp_attendee (comp, NULL);

    case E_CAL_COMPONENT_METHOD_REPLY:
        sender = itip_get_comp_attendee (comp, NULL);
        if (sender != NULL)
            return sender;
        if (!e_cal_component_has_attendees (comp))
            return NULL;

    case E_CAL_COMPONENT_METHOD_CANCEL:

    case E_CAL_COMPONENT_METHOD_ADD:

        e_cal_component_get_organizer (comp, &organizer);
        if (organizer.value == NULL) {
            e_notice (NULL, GTK_MESSAGE_ERROR,
                  _("An organizer must be set."));
            return NULL;
        }
        return g_strdup (itip_strip_mailto (organizer.value));


    default:
        if (!e_cal_component_has_attendees (comp))
            return NULL;

        e_cal_component_get_attendee_list (comp, &attendees);
        attendee = attendees->data;
        if (attendee->value != NULL)
            from = g_strdup (itip_strip_mailto (attendee->value));
        else
            from = NULL;
        e_cal_component_free_attendee_list (attendees);

        return from;
    }
}

static EDestination **
comp_to_list (ECalComponentItipMethod method, ECalComponent *comp, GList *users, gboolean reply_all)
{
    ECalComponentOrganizer organizer;
    GSList *attendees, *l;
    GPtrArray *array = NULL;
    EDestination *destination;
    gint len;
    char *sender = NULL;

    union {
        gpointer *pdata;
        EDestination **destinations;
    } convert;

    switch (method) {
    case E_CAL_COMPONENT_METHOD_REQUEST:
    case E_CAL_COMPONENT_METHOD_CANCEL:
        e_cal_component_get_attendee_list (comp, &attendees);
        len = g_slist_length (attendees);
        if (len <= 0) {
            e_notice (NULL, GTK_MESSAGE_ERROR,
                  _("At least one attendee is necessary"));
            e_cal_component_free_attendee_list (attendees);
            return NULL;
        }

        e_cal_component_get_organizer (comp, &organizer);
        if (organizer.value == NULL) {
            e_notice (NULL, GTK_MESSAGE_ERROR,
                  _("An organizer must be set."));
            return NULL;
        }

        array = g_ptr_array_new ();

        sender = itip_get_comp_attendee (comp, NULL);

        for (l = attendees; l != NULL; l = l->next) {
            ECalComponentAttendee *att = l->data;

            if (att->cutype != ICAL_CUTYPE_INDIVIDUAL && att->cutype != ICAL_CUTYPE_GROUP)
                continue;
            else if (users_has_attendee (users, att->value))
                continue;
            else if (att->sentby && users_has_attendee (users, att->sentby))
                continue;
            else if (!g_ascii_strcasecmp (att->value, organizer.value))
                continue;
            else if (att->sentby && !g_ascii_strcasecmp (att->sentby, organizer.sentby))
                continue;
            else if (!g_ascii_strcasecmp (itip_strip_mailto (att->value), sender))
                continue;
            else if (att->status == ICAL_PARTSTAT_DELEGATED && (att->delto && *att->delto)
                    && !(att->rsvp) && method == E_CAL_COMPONENT_METHOD_REQUEST)
                continue;

            destination = e_destination_new ();
            if (att->cn != NULL)
                e_destination_set_name (destination, att->cn);
            e_destination_set_email (
                destination, itip_strip_mailto (att->value));
            g_ptr_array_add (array, destination);
        }
        g_free (sender);
        e_cal_component_free_attendee_list (attendees);
        break;

    case E_CAL_COMPONENT_METHOD_REPLY:

        if (reply_all){
            e_cal_component_get_attendee_list (comp, &attendees);
            len = g_slist_length (attendees);

            if (len <= 0)
                return NULL;

            array = g_ptr_array_new ();

            e_cal_component_get_organizer (comp, &organizer);
            sender = itip_get_comp_attendee (comp, NULL);

            for (l = attendees; l != NULL; l = l->next) {
                ECalComponentAttendee *att = l->data;

                if (att->cutype != ICAL_CUTYPE_INDIVIDUAL && att->cutype != ICAL_CUTYPE_GROUP)
                    continue;

                destination = e_destination_new ();
                if (att->cn != NULL)
                    e_destination_set_name (destination, att->cn);
                e_destination_set_email (
                    destination, itip_strip_mailto (att->value));
                g_ptr_array_add (array, destination);
            }

            g_free (sender);
            e_cal_component_free_attendee_list (attendees);

        } else {
            array = g_ptr_array_new ();

            destination = e_destination_new ();
            e_cal_component_get_organizer (comp, &organizer);
            if (organizer.value)
                e_destination_set_email (
                    destination, itip_strip_mailto (organizer.value));
            g_ptr_array_add (array, destination);
        }
        break;

    case E_CAL_COMPONENT_METHOD_ADD:
    case E_CAL_COMPONENT_METHOD_REFRESH:
    case E_CAL_COMPONENT_METHOD_COUNTER:
    case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
        e_cal_component_get_organizer (comp, &organizer);
        if (organizer.value == NULL) {
            e_notice (NULL, GTK_MESSAGE_ERROR,
                  _("An organizer must be set."));
            return NULL;
        }

        array = g_ptr_array_new ();

        destination = e_destination_new ();
        if (organizer.cn != NULL)
            e_destination_set_name (destination, organizer.cn);
        e_destination_set_email (
            destination, itip_strip_mailto (organizer.value));
        g_ptr_array_add (array, destination);

        /* send the status to delegatee to the delegate also*/
        e_cal_component_get_attendee_list (comp, &attendees);
        sender = itip_get_comp_attendee (comp, NULL);

        for (l = attendees; l != NULL; l = l->next) {
            ECalComponentAttendee *att = l->data;

            if (att->cutype != ICAL_CUTYPE_INDIVIDUAL && att->cutype != ICAL_CUTYPE_GROUP)
                continue;

            if (!g_ascii_strcasecmp (itip_strip_mailto (att->value), sender) || (att->sentby && !g_ascii_strcasecmp (itip_strip_mailto (att->sentby), sender))){

                if (!(att->delfrom && *att->delfrom))
                    break;

                destination = e_destination_new ();
                e_destination_set_email (
                    destination, itip_strip_mailto (att->delfrom));
                g_ptr_array_add (array, destination);
            }

        }
        e_cal_component_free_attendee_list (attendees);

        break;
    case E_CAL_COMPONENT_METHOD_PUBLISH:
        if(users) {
            GList *list;

            array = g_ptr_array_new ();

            for (list = users; list != NULL; list = list->next) {
                destination = e_destination_new ();
                e_destination_set_email (destination, list->data);
                g_ptr_array_add (array, destination);
            }

            break;
        }
    default:
        break;
    }

    if (array == NULL)
        return NULL;

    convert.pdata = array->pdata;
    g_ptr_array_add (array, NULL);
    g_ptr_array_free (array, FALSE);

    return convert.destinations;
}

static gchar *
comp_subject (ECalComponentItipMethod method, ECalComponent *comp)
{
    ECalComponentText caltext;
    const char *description, *prefix = NULL;
    GSList *alist, *l;
    gchar *subject;
    char *sender;
    ECalComponentAttendee *a = NULL;

    e_cal_component_get_summary (comp, &caltext);
    if (caltext.value != NULL)
        description = caltext.value;
    else {
        switch (e_cal_component_get_vtype (comp)) {
        case E_CAL_COMPONENT_EVENT:
            description = _("Event information");
        case E_CAL_COMPONENT_TODO:
            description = _("Task information");
        case E_CAL_COMPONENT_JOURNAL:
            description = _("Memo information");
        case E_CAL_COMPONENT_FREEBUSY:
            description = _("Free/Busy information");
        default:
            description = _("Calendar information");
        }
    }

    switch (method) {
    case E_CAL_COMPONENT_METHOD_PUBLISH:
    case E_CAL_COMPONENT_METHOD_REQUEST:
        /* FIXME: If this is an update to a previous
         * PUBLISH or REQUEST, then
            prefix = U_("Updated");
         */
        break;

    case E_CAL_COMPONENT_METHOD_REPLY:
        e_cal_component_get_attendee_list (comp, &alist);
        sender = itip_get_comp_attendee (comp, NULL);
        if (sender) {

            for (l = alist; l != NULL ; l = l->next) {
                a = l->data;
                if ((sender && *sender) && (g_ascii_strcasecmp (itip_strip_mailto (a->value), sender) || (a->sentby && g_ascii_strcasecmp (itip_strip_mailto (a->sentby), sender))))
                    break;
            }
            g_free (sender);
        }

        if (alist != NULL) {

            switch (a->status) {
            case ICAL_PARTSTAT_ACCEPTED:
                prefix = _("Accepted");
                break;
            case ICAL_PARTSTAT_TENTATIVE:
                prefix = _("Tentatively Accepted");
                break;
            case ICAL_PARTSTAT_DECLINED:
                prefix = _("Declined");
                break;
            case ICAL_PARTSTAT_DELEGATED:
                prefix = _("Delegated");
                break;
            default:
                break;
            }
            e_cal_component_free_attendee_list (alist);
        }
        break;

    case E_CAL_COMPONENT_METHOD_ADD:
        prefix = _("Updated");
        break;

    case E_CAL_COMPONENT_METHOD_CANCEL:
        prefix = _("Cancel");
        break;

    case E_CAL_COMPONENT_METHOD_REFRESH:
        prefix = _("Refresh");
        break;

    case E_CAL_COMPONENT_METHOD_COUNTER:
        prefix = _("Counter-proposal");
        break;

    case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
        prefix = _("Declined");
        break;

    default:
        break;
    }

    if (prefix != NULL)
        subject = g_strdup_printf ("%s: %s", prefix, description);
    else
        subject = g_strdup (description);

    return subject;
}

static gchar *
comp_content_type (ECalComponent *comp, ECalComponentItipMethod method)
{
    return g_strdup_printf (
        "text/calendar; name=\"%s\"; charset=utf-8; METHOD=%s",
        e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_FREEBUSY ?
        "freebusy.ifb" : "calendar.ics", itip_methods[method]);
}

static const gchar *
comp_filename (ECalComponent *comp)
{
    if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_FREEBUSY)
        return "freebusy.ifb";
    else
        return "calendar.ics";
}

static gchar *
comp_description (ECalComponent *comp)
{
    gchar *description;
        ECalComponentDateTime dt;
        char *start = NULL, *end = NULL;

        switch (e_cal_component_get_vtype (comp)) {
        case E_CAL_COMPONENT_EVENT:
                description = g_strdup (_("Event information"));
        break;
        case E_CAL_COMPONENT_TODO:
                description = g_strdup (_("Task information"));
        break;
        case E_CAL_COMPONENT_JOURNAL:
                description = g_strdup (_("Memo information"));
        break;
        case E_CAL_COMPONENT_FREEBUSY:
                e_cal_component_get_dtstart (comp, &dt);
                if (dt.value)
                        start = get_label (dt.value);
        e_cal_component_free_datetime (&dt);

        e_cal_component_get_dtend (comp, &dt);
        if (dt.value)
            end = get_label (dt.value);
        e_cal_component_free_datetime (&dt);

                if (start != NULL && end != NULL)
            description = g_strdup_printf (
                _("Free/Busy information (%s to %s)"),
                start, end);
                else
            description = g_strdup (_("Free/Busy information"));
                g_free (start);
                g_free (end);
        break;
        default:
                description = g_strdup (_("iCalendar information"));
        break;
        }

    return description;
}

static gboolean
comp_server_send (ECalComponentItipMethod method, ECalComponent *comp, ECal *client,
          icalcomponent *zones, GList **users)
{
    icalcomponent *top_level, *returned_icalcomp = NULL;
    gboolean retval = TRUE;
    GError *error = NULL;

    top_level = comp_toplevel_with_zones (method, comp, client, zones);
    if (!e_cal_send_objects (client, top_level, users, &returned_icalcomp, &error)) {
        /* FIXME Really need a book problem status code */
        if (error->code != E_CALENDAR_STATUS_OK) {
            /* FIXME Better error message */
            e_notice (NULL, GTK_MESSAGE_ERROR, "Unable to book");

            retval = FALSE;
        }
    }

    g_clear_error (&error);

    if (returned_icalcomp)
        icalcomponent_free (returned_icalcomp);
    icalcomponent_free (top_level);

    return retval;
}

static gboolean
comp_limit_attendees (ECalComponent *comp)
{
    icalcomponent *icomp;
    icalproperty *prop;
    gboolean found = FALSE, match = FALSE;
    GSList *l, *list = NULL;

    icomp = e_cal_component_get_icalcomponent (comp);

    for (prop = icalcomponent_get_first_property (icomp, ICAL_ATTENDEE_PROPERTY);
         prop != NULL;
         prop = icalcomponent_get_next_property (icomp, ICAL_ATTENDEE_PROPERTY))
    {
        char *attendee;
        char *attendee_text;
        icalparameter *param;
        const char *attendee_sentby;
        char *attendee_sentby_text = NULL;

        /* If we've already found something, just erase the rest */
        if (found) {
            list = g_slist_prepend (list, prop);
            continue;
        }

        attendee = icalproperty_get_value_as_string (prop);
        if (!attendee)
            continue;

        attendee_text = g_strdup (itip_strip_mailto (attendee));
        g_free (attendee);
        attendee_text = g_strstrip (attendee_text);
        found = match = e_account_list_find(itip_addresses_get(), E_ACCOUNT_FIND_ID_ADDRESS, attendee_text) != NULL;

        if (!found) {
            param = icalproperty_get_first_parameter (prop, ICAL_SENTBY_PARAMETER);
            if (param) {
                attendee_sentby = icalparameter_get_sentby (param);
                attendee_sentby_text = g_strdup (itip_strip_mailto (attendee_sentby));
                attendee_sentby_text = g_strstrip (attendee_sentby_text);
                found = match = e_account_list_find(itip_addresses_get(), E_ACCOUNT_FIND_ID_ADDRESS, attendee_sentby_text) != NULL;
            }
        }

        g_free(attendee_text);
        g_free (attendee_sentby_text);

        if (!match)
            list = g_slist_prepend (list, prop);
        match = FALSE;
    }

    for (l = list; l != NULL; l = l->next) {
        prop = l->data;

        icalcomponent_remove_property (icomp, prop);
        icalproperty_free (prop);
    }
    g_slist_free (list);

    return found;
}

static void
comp_sentby (ECalComponent *comp, ECal *client)
{
    ECalComponentOrganizer organizer;
    GSList * attendees, *l;
    char *user = NULL;

    e_cal_component_get_organizer (comp, &organizer);
    if (!organizer.value) {
        EAccount *a = itip_addresses_get_default ();

        organizer.value = g_strdup_printf ("MAILTO:%s", a->id->address);
        organizer.sentby = NULL;
        organizer.cn = a->id->name;
        organizer.language = NULL;

        e_cal_component_set_organizer (comp, &organizer);
        g_free ((char *) organizer.value);

        return;
    }

    e_cal_component_get_attendee_list (comp, &attendees);
    user = itip_get_comp_attendee (comp, client);
    for (l = attendees; l; l = l->next) {
        ECalComponentAttendee *a = l->data;

        if (!g_ascii_strcasecmp (itip_strip_mailto (a->value), user) || (a->sentby && !g_ascii_strcasecmp (itip_strip_mailto (a->sentby), user))) {
            g_free (user);
            return;
        }
    }

    if (!itip_organizer_is_user (comp, client) && !itip_sentby_is_user (comp)) {
        EAccount *a = itip_addresses_get_default ();

        organizer.value = g_strdup (organizer.value);
        organizer.sentby = g_strdup_printf ("MAILTO:%s", a->id->address);
        organizer.cn = g_strdup (organizer.cn);
        organizer.language = g_strdup (organizer.language);

        e_cal_component_set_organizer (comp, &organizer);

        g_free ((char *)organizer.value);
        g_free ((char *)organizer.sentby);
        g_free ((char *)organizer.cn);
        g_free ((char *)organizer.language);
    }
}
static ECalComponent *
comp_minimal (ECalComponent *comp, gboolean attendee)
{
    ECalComponent *clone;
    icalcomponent *icomp, *icomp_clone;
    icalproperty *prop;
    ECalComponentOrganizer organizer;
    const char *uid;
    GSList *comments;
    struct icaltimetype itt;
    ECalComponentRange recur_id;

    clone = e_cal_component_new ();
    e_cal_component_set_new_vtype (clone, e_cal_component_get_vtype (comp));

    if (attendee) {
        GSList *attendees;

        e_cal_component_get_attendee_list (comp, &attendees);
        e_cal_component_set_attendee_list (clone, attendees);

        if (!comp_limit_attendees (clone)) {
            e_notice (NULL, GTK_MESSAGE_ERROR,
                  _("You must be an attendee of the event."));
            goto error;
        }
    }

    itt = icaltime_from_timet_with_zone (time (NULL), FALSE,
                         icaltimezone_get_utc_timezone ());
    e_cal_component_set_dtstamp (clone, &itt);

    e_cal_component_get_organizer (comp, &organizer);
    if (organizer.value == NULL)
        goto error;
    e_cal_component_set_organizer (clone, &organizer);

    e_cal_component_get_uid (comp, &uid);
    e_cal_component_set_uid (clone, uid);

    e_cal_component_get_comment_list (comp, &comments);
    if (g_slist_length (comments) <= 1) {
        e_cal_component_set_comment_list (clone, comments);
    } else {
        GSList *l = comments;

        comments = g_slist_remove_link (comments, l);
        e_cal_component_set_comment_list (clone, l);
        e_cal_component_free_text_list (l);
    }
    e_cal_component_free_text_list (comments);

    e_cal_component_get_recurid (comp, &recur_id);
    if (recur_id.datetime.value != NULL)
        e_cal_component_set_recurid (clone, &recur_id);

    icomp = e_cal_component_get_icalcomponent (comp);
    icomp_clone = e_cal_component_get_icalcomponent (clone);
    for (prop = icalcomponent_get_first_property (icomp, ICAL_X_PROPERTY);
         prop != NULL;
         prop = icalcomponent_get_next_property (icomp, ICAL_X_PROPERTY))
    {
        icalproperty *p;

        p = icalproperty_new_clone (prop);
        icalcomponent_add_property (icomp_clone, p);
    }

    e_cal_component_rescan (clone);

    return clone;

 error:
    g_object_unref (clone);
    return NULL;
}

static ECalComponent *
comp_compliant (ECalComponentItipMethod method, ECalComponent *comp, ECal *client, icalcomponent *zones)
{
    ECalComponent *clone, *temp_clone;
    struct icaltimetype itt;

    clone = e_cal_component_clone (comp);
    itt = icaltime_from_timet_with_zone (time (NULL), FALSE,
                         icaltimezone_get_utc_timezone ());
    e_cal_component_set_dtstamp (clone, &itt);

    /* Make UNTIL date a datetime in a simple recurrence */
    if (e_cal_component_has_recurrences (clone)
        && e_cal_component_has_simple_recurrence (clone)) {
        GSList *rrule_list;
        struct icalrecurrencetype *r;

        e_cal_component_get_rrule_list (clone, &rrule_list);
        r = rrule_list->data;

        if (!icaltime_is_null_time (r->until) && r->until.is_date) {
            ECalComponentDateTime dt;
            icaltimezone *from_zone = NULL, *to_zone;

            e_cal_component_get_dtstart (clone, &dt);

            if (dt.value->is_date) {
                from_zone = calendar_config_get_icaltimezone ();
            } else if (dt.tzid == NULL) {
                from_zone = icaltimezone_get_utc_timezone ();
            } else {
                if (zones != NULL)
                    from_zone = icalcomponent_get_timezone (zones, dt.tzid);
                if (from_zone == NULL)
                    from_zone = icaltimezone_get_builtin_timezone_from_tzid (dt.tzid);
                if (from_zone == NULL && client != NULL)
                    /* FIXME Error checking */
                    e_cal_get_timezone (client, dt.tzid, &from_zone, NULL);
            }

            to_zone = icaltimezone_get_utc_timezone ();

            r->until.hour = dt.value->hour;
            r->until.minute = dt.value->minute;
            r->until.second = dt.value->second;
            r->until.is_date = FALSE;

            icaltimezone_convert_time (&r->until, from_zone, to_zone);
            r->until.is_utc = TRUE;

            e_cal_component_free_datetime (&dt);
            e_cal_component_set_rrule_list (clone, rrule_list);
            e_cal_component_abort_sequence (clone);
        }

        e_cal_component_free_recur_list (rrule_list);
    }

    /* We delete incoming alarms anyhow, and this helps with outlook */
    e_cal_component_remove_all_alarms (clone);

    /* Strip X-LIC-ERROR stuff */
    e_cal_component_strip_errors (clone);

    /* Comply with itip spec */
    switch (method) {
    case E_CAL_COMPONENT_METHOD_PUBLISH:
        comp_sentby (clone, client);
        e_cal_component_set_attendee_list (clone, NULL);
        break;
    case E_CAL_COMPONENT_METHOD_REQUEST:
        comp_sentby (clone, client);
        break;
    case E_CAL_COMPONENT_METHOD_CANCEL:
        comp_sentby (clone, client);
        break;
    case E_CAL_COMPONENT_METHOD_REPLY:
        break;
    case E_CAL_COMPONENT_METHOD_ADD:
        break;
    case E_CAL_COMPONENT_METHOD_REFRESH:
        /* Need to remove almost everything */
        temp_clone = comp_minimal (clone, TRUE);
        g_object_unref (clone);
        clone = temp_clone;
        break;
    case E_CAL_COMPONENT_METHOD_COUNTER:
        break;
    case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
        /* Need to remove almost everything */
        temp_clone = comp_minimal (clone, FALSE);
        g_object_unref (clone);
        clone = temp_clone;
        break;
    default:
        break;
    }

    return clone;
}

static void
append_cal_attachments (EMsgComposer *composer,
                        ECalComponent *comp,
                        GSList *attach_list)
{
    struct CalMimeAttach *mime_attach;
    GSList *l;

    for (l = attach_list; l ; l = l->next) {
        CamelMimePart *attachment;

        mime_attach = (struct CalMimeAttach *) l->data;

        attachment = camel_mime_part_new ();
        camel_mime_part_set_content (
            attachment, mime_attach->encoded_data,
            mime_attach->length, mime_attach->content_type);
        if (mime_attach->filename != NULL)
            camel_mime_part_set_filename (
                attachment, mime_attach->filename);
        if (mime_attach->description != NULL)
            camel_mime_part_set_description (
                attachment, mime_attach->description);
        if (mime_attach->disposition)
            camel_mime_part_set_disposition (
                attachment, "inline");
        else
            camel_mime_part_set_disposition (
                attachment, "attachment");
        e_msg_composer_attach (composer, attachment);
        camel_object_unref (attachment);

        g_free (mime_attach->filename);
        g_free (mime_attach->content_type);
        g_free (mime_attach->description);
        g_free (mime_attach->encoded_data);
    }
}

gboolean
itip_send_comp (ECalComponentItipMethod method, ECalComponent *send_comp,
        ECal *client, icalcomponent *zones, GSList *attachments_list, GList *users)
{
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    EDestination **destinations;
    ECalComponent *comp = NULL;
    icalcomponent *top_level = NULL;
    char *ical_string = NULL;
    gchar *from;
    gchar *content_type;
    gchar *subject;
    gboolean retval = FALSE;

    /* check whether backend could handle sending requests/updates */
    if (method != E_CAL_COMPONENT_METHOD_PUBLISH && e_cal_get_save_schedules (client))
        return TRUE;

    /* Give the server a chance to manipulate the comp */
    if (method != E_CAL_COMPONENT_METHOD_PUBLISH) {
        if (!comp_server_send (method, send_comp, client, zones, &users))
            goto cleanup;
    }

    /* Tidy up the comp */
    comp = comp_compliant (method, send_comp, client, zones);

    if (comp == NULL)
        goto cleanup;

    /* Recipients */
    destinations = comp_to_list (method, comp, users, FALSE);
    if (method != E_CAL_COMPONENT_METHOD_PUBLISH) {
        if (destinations == NULL) {
            /* We sent them all via the server */
            retval = TRUE;
            goto cleanup;
        }
    }

    /* Subject information */
    subject = comp_subject (method, comp);

    /* From address */
    from = comp_from (method, comp);

    composer = e_msg_composer_new ();
    table = e_msg_composer_get_header_table (composer);
    em_composer_utils_setup_default_callbacks (composer);

    e_composer_header_table_set_subject (table, subject);
    e_composer_header_table_set_account_name (table, from);
    e_composer_header_table_set_destinations_to (table, destinations);

    e_destination_freev (destinations);

    /* Content type */
    content_type = comp_content_type (comp, method);

    top_level = comp_toplevel_with_zones (method, comp, client, zones);
    ical_string = icalcomponent_as_ical_string (top_level);

    if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_EVENT) {
        e_msg_composer_set_body (composer, ical_string, content_type);
    } else {
        CamelMimePart *attachment;
        const gchar *filename;
        gchar *description;
        gchar *body;

        filename = comp_filename (comp);
        description = comp_description (comp);

        body = camel_text_to_html (
            body, CAMEL_MIME_FILTER_TOHTML_PRE, 0);
        e_msg_composer_set_body_text (composer, body, -1);
        g_free (body);

        attachment = camel_mime_part_new ();
        camel_mime_part_set_content (
            attachment, ical_string,
            strlen (ical_string), content_type);
        if (filename != NULL && *filename != '\0')
            camel_mime_part_set_filename (attachment, filename);
        if (description != NULL && *description != '\0')
            camel_mime_part_set_description (attachment, description);
        camel_mime_part_set_disposition (attachment, "inline");
        e_msg_composer_attach (composer, attachment);
        camel_object_unref (attachment);

        g_free (description);
    }

    append_cal_attachments (composer, comp, attachments_list);

    if ((method == E_CAL_COMPONENT_METHOD_PUBLISH) && !users)
        gtk_widget_show (GTK_WIDGET (composer));
    else
        e_msg_composer_send (composer);

    retval = TRUE;

 cleanup:
    if (comp != NULL)
        g_object_unref (comp);
    if (top_level != NULL)
        icalcomponent_free (top_level);

    if (users) {
        g_list_foreach (users, (GFunc) g_free, NULL);
        g_list_free (users);
    }

    g_free (from);
    g_free (content_type);
    g_free (subject);
    g_free (ical_string);

    return retval;
}

gboolean
reply_to_calendar_comp (ECalComponentItipMethod method,
                        ECalComponent *send_comp,
                        ECal *client,
                        gboolean reply_all,
                        icalcomponent *zones,
                        GSList *attachments_list)
{
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    EDestination **destinations;
    ECalComponent *comp = NULL;
    icalcomponent *top_level = NULL;
    GList *users = NULL;
    gchar *from;
    gchar *subject;
    char *ical_string = NULL;
    gboolean retval = FALSE;

    /* Tidy up the comp */
    comp = comp_compliant (method, send_comp, client, zones);
    if (comp == NULL)
        goto cleanup;

    /* Recipients */
    destinations = comp_to_list (method, comp, users, reply_all);

    /* Subject information */
    subject = comp_subject (method, comp);

    /* From address */
    from = comp_from (method, comp);

    composer = e_msg_composer_new ();
    table = e_msg_composer_get_header_table (composer);
    em_composer_utils_setup_default_callbacks (composer);

    e_composer_header_table_set_subject (table, subject);
    e_composer_header_table_set_account_name (table, from);
    e_composer_header_table_set_destinations_to (table, destinations);

    e_destination_freev (destinations);

    top_level = comp_toplevel_with_zones (method, comp, client, zones);
    ical_string = icalcomponent_as_ical_string (top_level);

    if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_EVENT){

        GString *body;
        char *orig_from = NULL;
        char *description = NULL;
        char *subject = NULL;
        const char *location = NULL;
        char *time = NULL;
        char *html_description = NULL;
        GSList *text_list = NULL;
        ECalComponentOrganizer organizer;
        ECalComponentText text;
        ECalComponentDateTime dtstart;
        icaltimezone *start_zone = NULL;
        time_t start;

        e_cal_component_get_description_list (comp, &text_list);

        if (text_list){
            ECalComponentText text = *((ECalComponentText *)text_list->data);
                    if (text.value)
                            description = (char *)text.value;
                    else
                            description = "";
            } else {
                    description = "";
            }

        e_cal_component_free_text_list (text_list);


        e_cal_component_get_summary (comp, &text);
        if (text.value)
            subject = g_strdup (text.value);


        e_cal_component_get_organizer (comp, &organizer);
        if (organizer.value)
            orig_from = g_strdup (itip_strip_mailto (organizer.value));


        e_cal_component_get_location (comp, &location);
        if (!location)
            location = "Unspecified";


        e_cal_component_get_dtstart (comp, &dtstart);
        if (dtstart.value) {
            start_zone = icaltimezone_get_builtin_timezone_from_tzid (dtstart.tzid);
            if (!start_zone) {
                if (!e_cal_get_timezone (client, dtstart.tzid, &start_zone, NULL))
                    g_warning ("Couldn't get timezone from server: %s", dtstart.tzid ? dtstart.tzid : "");
            }

            if (!start_zone || dtstart.value->is_date)
                start_zone = calendar_config_get_icaltimezone ();

            start = icaltime_as_timet_with_zone (*dtstart.value, start_zone);
            time = g_strdup (ctime (&start));
        }


        body = g_string_new ("<br><br><hr><br><b>______ Original Appointment ______ </b><br><br><table>");

        if (orig_from && *orig_from)
            g_string_append_printf (body,
                "<tr><td><b>From</b></td>"
                "<td>:</td><td>%s</td></tr>", orig_from);
        g_free (orig_from);

        if (subject)
            g_string_append_printf (body,
                "<tr><td><b>Subject</b></td>"
                "<td>:</td><td>%s</td></tr>", subject);
        g_free (subject);

        g_string_append_printf (body,
            "<tr><td><b>Location</b></td>"
            "<td>:</td><td>%s</td></tr>", location);

        if (time)
            g_string_append_printf (body,
                "<tr><td><b>Time</b></td>"
                "<td>:</td><td>%s</td></tr>", time);
        g_free (time);

        g_string_append_printf (body, "</table><br>");

        html_description = html_new_lines_for (description);
        g_string_append (body, html_description);
        g_free (html_description);

        e_msg_composer_set_body_text (composer, body->str, -1);
        g_string_free (body, TRUE);
    }

    gtk_widget_show (GTK_WIDGET (composer));

    retval = TRUE;

 cleanup:

    if (comp != NULL)
        g_object_unref (comp);
    if (top_level != NULL)
        icalcomponent_free (top_level);

    if (users) {
        g_list_foreach (users, (GFunc) g_free, NULL);
        g_list_free (users);
    }

    g_free (from);
    g_free (subject);
    g_free (ical_string);
    return retval;
}

gboolean
itip_publish_begin (ECalComponent *pub_comp, ECal *client,
            gboolean cloned, ECalComponent **clone)
{
    icalcomponent *icomp =NULL, *icomp_clone = NULL;
    icalproperty *prop;

    if (e_cal_component_get_vtype (pub_comp) == E_CAL_COMPONENT_FREEBUSY) {

        if (!cloned) {
            *clone = e_cal_component_clone (pub_comp);
            cloned = TRUE;
        } else {

            icomp = e_cal_component_get_icalcomponent (pub_comp);
            icomp_clone = e_cal_component_get_icalcomponent (*clone);
            for (prop = icalcomponent_get_first_property (icomp,
                              ICAL_FREEBUSY_PROPERTY);
                    prop != NULL;
                    prop = icalcomponent_get_next_property (icomp,
                               ICAL_FREEBUSY_PROPERTY))
            {
                icalproperty *p;

                p = icalproperty_new_clone (prop);
                icalcomponent_add_property (icomp_clone, p);
            }
        }
    }

    return TRUE;
}

static void
fb_sort (struct icalperiodtype *ipt, int fb_count)
{
    int i,j;

    if (ipt == NULL || fb_count == 0)
        return;

    for (i = 0; i < fb_count-1; i++) {
        for (j = i+1; j < fb_count; j++) {
            struct icalperiodtype temp;

            if (icaltime_compare (ipt[i].start, ipt[j].start) < 0)
                continue;

            if (icaltime_compare (ipt[i].start, ipt[j].start) == 0){
                if (icaltime_compare (ipt[i].end,
                             ipt[j].start) < 0)
                    continue;
            }
            temp = ipt[i];
            ipt[i] = ipt[j];
            ipt[j] = temp;
        }
    }
}

static icalcomponent *
comp_fb_normalize (icalcomponent *icomp)
{
    icalcomponent *iclone;
    icalproperty *prop, *p;
    const char *uid,  *comment;
    struct icaltimetype itt;
    int fb_count, i = 0, j;
    struct icalperiodtype *ipt;

    iclone = icalcomponent_new (ICAL_VFREEBUSY_COMPONENT);

    prop = icalcomponent_get_first_property (icomp,
                         ICAL_ORGANIZER_PROPERTY);
    if (prop) {
        p = icalproperty_new_clone (prop);
        icalcomponent_add_property (iclone, p);
    }

    itt = icalcomponent_get_dtstart (icomp);
    icalcomponent_set_dtstart (iclone, itt);

    itt = icalcomponent_get_dtend (icomp);
    icalcomponent_set_dtend (iclone, itt);

    fb_count =  icalcomponent_count_properties (icomp,
                            ICAL_FREEBUSY_PROPERTY);
    ipt = g_new0 (struct icalperiodtype, fb_count+1);

    for (prop = icalcomponent_get_first_property (icomp,
                              ICAL_FREEBUSY_PROPERTY);
        prop != NULL;
        prop = icalcomponent_get_next_property (icomp,
                            ICAL_FREEBUSY_PROPERTY))
    {
        ipt[i] = icalproperty_get_freebusy (prop);
        i++;
    }

    fb_sort (ipt, fb_count);

    for (j = 0; j <= fb_count-1; j++) {
        icalparameter *param;

        prop = icalproperty_new_freebusy (ipt[j]);
        param = icalparameter_new_fbtype (ICAL_FBTYPE_BUSY);
        icalproperty_add_parameter (prop, param);
        icalcomponent_add_property (iclone, prop);
    }
    g_free (ipt);

    /* Should I strip this RFC 2446 says there must not be a UID
        if the METHOD is PUBLISH?? */
    uid = icalcomponent_get_uid (icomp);
    if (uid)
        icalcomponent_set_uid (iclone, uid);

    itt = icaltime_from_timet_with_zone (time (NULL), FALSE,
                         icaltimezone_get_utc_timezone ());
    icalcomponent_set_dtstamp (iclone, itt);

    prop = icalcomponent_get_first_property (icomp, ICAL_URL_PROPERTY);
    if (prop) {
        p = icalproperty_new_clone (prop);
        icalcomponent_add_property (iclone, p);
    }

    comment =  icalcomponent_get_comment (icomp);
    if (comment)
        icalcomponent_set_comment (iclone, comment);

    for (prop = icalcomponent_get_first_property (icomp, ICAL_X_PROPERTY);
         prop != NULL;
         prop = icalcomponent_get_next_property (icomp, ICAL_X_PROPERTY))
    {
        p = icalproperty_new_clone (prop);
        icalcomponent_add_property (iclone, p);
    }

    return iclone;
    /* this will never be reached */
    g_object_unref (iclone);
    return NULL;
}

gboolean
itip_publish_comp (ECal *client, gchar *uri, gchar *username,
           gchar *password, ECalComponent **pub_comp)
{
    icalcomponent *toplevel = NULL, *icalcomp = NULL;
    icalcomponent *icomp = NULL;
    SoupSession *session;
    SoupMessage *msg;
    SoupURI *real_uri;
    char *ical_string = NULL;

    toplevel = e_cal_util_new_top_level ();
    icalcomponent_set_method (toplevel, ICAL_METHOD_PUBLISH);

    e_cal_component_set_url (*pub_comp, uri);

    icalcomp = e_cal_component_get_icalcomponent (*pub_comp);

    icomp = comp_fb_normalize (icalcomp);

    icalcomponent_add_component (toplevel, icomp);

    /* Publish the component */
    session = soup_session_async_new ();

    real_uri = soup_uri_new (uri);
    if (!real_uri || !real_uri->host) {
        g_warning (G_STRLOC ": Invalid URL: %s", uri);
        g_object_unref (session);
        return FALSE;
    }

    soup_uri_set_user (real_uri, username);
    soup_uri_set_password (real_uri, password);

    /* build the message */
    msg = soup_message_new_from_uri (SOUP_METHOD_PUT, real_uri);
    soup_uri_free (real_uri);
    if (!msg) {
        g_warning (G_STRLOC ": Could not build SOAP message");
        g_object_unref (session);
        return FALSE;
    }

    soup_message_set_flags (msg, SOUP_MESSAGE_NO_REDIRECT);
    ical_string = icalcomponent_as_ical_string (toplevel);
    soup_message_set_request (msg, "text/calendar", SOUP_MEMORY_TEMPORARY,
                  ical_string, strlen (ical_string));

    /* send message to server */
    soup_session_send_message (session, msg);
    if (!SOUP_STATUS_IS_SUCCESSFUL (msg->status_code)) {
        g_warning(G_STRLOC ": Could not publish Free/Busy: %d: %s",
              msg->status_code,
              msg->reason_phrase);
        g_object_unref (msg);
        g_object_unref (session);
        g_free (ical_string);
        return FALSE;
    }

    g_object_unref (msg);
    g_object_unref (session);
    g_free (ical_string);

    return TRUE;
}

static gboolean
check_time (const struct icaltimetype tmval, gboolean can_null_time)
{
    if (icaltime_is_null_time (tmval))
        return can_null_time;

    return  icaltime_is_valid_time (tmval) &&
        tmval.month >= 1 && tmval.month <= 12 &&
        tmval.day >= 1 && tmval.day <= 31 &&
        tmval.hour >= 0 && tmval.hour < 24 &&
        tmval.minute >= 0 && tmval.minute < 60 &&
        tmval.second >= 0 && tmval.second < 60;
}

/* returns whether the passed-in icalcomponent is valid or not. It does some sanity checks on values too. */
gboolean
is_icalcomp_valid (icalcomponent *icalcomp)
{
    return  icalcomp &&
        icalcomponent_is_valid (icalcomp) &&
        check_time (icalcomponent_get_dtstart (icalcomp), FALSE) &&
        check_time (icalcomponent_get_dtend (icalcomp), TRUE);
}