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

/*
 * This program 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 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      JP Rosevear <jpr@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <time.h>
#include <glib/gi18n.h>
#include <libical/ical.h>
#include <libsoup/soup.h>

#include <composer/e-msg-composer.h>

#include "itip-utils.h"
#include "dialogs/comp-editor-util.h"

#define d(x)

static const 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,
};

/**
 * itip_get_default_name_and_address:
 * @registry: an #ESourceRegistry
 * @name: return location for the user's real name, or %NULL
 * @address: return location for the user's email address, or %NULL
 *
 * Returns the real name and email address of the default mail identity,
 * if available.  If no default mail identity is available, @name and
 * @address are set to %NULL and the function returns %FALSE.
 *
 * Returns: %TRUE if @name and/or @address were set
 **/
gboolean
itip_get_default_name_and_address (ESourceRegistry *registry,
                                   gchar **name,
                                   gchar **address)
{
    ESource *source;
    ESourceExtension *extension;
    const gchar *extension_name;
    gboolean success;

    source = e_source_registry_ref_default_mail_identity (registry);

    if (source != NULL) {
        extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
        extension = e_source_get_extension (source, extension_name);

        if (name != NULL)
            *name = e_source_mail_identity_dup_name (
                E_SOURCE_MAIL_IDENTITY (extension));

        if (address != NULL)
            *address = e_source_mail_identity_dup_address (
                E_SOURCE_MAIL_IDENTITY (extension));

        g_object_unref (source);

        success = TRUE;

    } else {
        if (name != NULL)
            *name = NULL;

        if (address != NULL)
            *address = NULL;

        success = FALSE;
    }

    return success;
}

/**
 * itip_get_user_identities:
 * @registry: an #ESourceRegistry
 *
 * Returns a %NULL-terminated array of name + address strings based on
 * registered mail identities.  Free the returned array with g_strfreev().
 *
 * Returns: an %NULL-terminated array of mail identity strings
 **/
gchar **
itip_get_user_identities (ESourceRegistry *registry)
{
    GList *list, *iter;
    const gchar *extension_name;
    gchar **identities;
    guint ii = 0;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;

    list = e_source_registry_list_sources (registry, extension_name);

    identities = g_new0 (gchar *, g_list_length (list) + 1);

    for (iter = list; iter != NULL; iter = g_list_next (iter)) {
        ESource *source = E_SOURCE (iter->data);
        ESourceMailIdentity *extension;
        const gchar *name, *address;

        extension = e_source_get_extension (source, extension_name);

        name = e_source_mail_identity_get_name (extension);
        address = e_source_mail_identity_get_address (extension);

        if (name == NULL || address == NULL)
            continue;

        identities[ii++] = g_strdup_printf ("%s <%s>", name, address);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    return identities;
}

/**
 * itip_get_fallback_identity:
 * @registry: an #ESourceRegistry
 *
 * Returns a name + address string taken from the default mail identity,
 * but only if the corresponding account is enabled.  If the account is
 * disabled, the function returns %NULL.  This is meant to be used as a
 * fallback identity for organizers.  Free the returned string with
 * g_free().
 *
 * Returns: a fallback mail identity, or %NULL
 **/
gchar *
itip_get_fallback_identity (ESourceRegistry *registry)
{
    ESource *source;
    ESourceMailIdentity *mail_identity;
    const gchar *extension_name;
    const gchar *address;
    const gchar *name;
    gchar *identity = NULL;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

    source = e_source_registry_ref_default_mail_identity (registry);

    if (source == NULL)
        return NULL;

    if (!e_source_registry_check_enabled (registry, source)) {
        g_object_unref (source);
        return NULL;
    }

    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
    mail_identity = e_source_get_extension (source, extension_name);

    name = e_source_mail_identity_get_name (mail_identity);
    address = e_source_mail_identity_get_address (mail_identity);

    if (name != NULL && address != NULL)
        identity = g_strdup_printf ("%s <%s>", name, address);

    g_object_unref (source);

    return identity;
}

/**
 * itip_address_is_user:
 * @registry: an #ESourceRegistry
 * @address: an email address
 *
 * Looks for a registered mail identity with a matching email address.
 *
 * Returns: %TRUE if a match was found, %FALSE if not
 **/
gboolean
itip_address_is_user (ESourceRegistry *registry,
                      const gchar *address)
{
    GList *list, *iter;
    const gchar *extension_name;
    gboolean match = FALSE;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);
    g_return_val_if_fail (address != NULL, FALSE);

    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;

    list = e_source_registry_list_sources (registry, extension_name);

    for (iter = list; iter != NULL; iter = g_list_next (iter)) {
        ESource *source = E_SOURCE (iter->data);
        ESourceMailIdentity *extension;
        const gchar *id_address;

        extension = e_source_get_extension (source, extension_name);
        id_address = e_source_mail_identity_get_address (extension);

        if (id_address == NULL)
            continue;

        if (g_ascii_strcasecmp (address, id_address) == 0) {
            match = TRUE;
            break;
        }
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    return match;
}

gboolean
itip_organizer_is_user (ESourceRegistry *registry,
                        ECalComponent *comp,
                        ECalClient *cal_client)
{
    return itip_organizer_is_user_ex (registry, comp, cal_client, FALSE);
}

gboolean
itip_organizer_is_user_ex (ESourceRegistry *registry,
                           ECalComponent *comp,
                           ECalClient *cal_client,
                           gboolean skip_cap_test)
{
    ECalComponentOrganizer organizer;
    const gchar *strip;
    gboolean user_org = FALSE;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

    if (!e_cal_component_has_organizer (comp) ||
        (!skip_cap_test && e_client_check_capability (
        E_CLIENT (cal_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_client_check_capability (E_CLIENT (cal_client), CAL_STATIC_CAPABILITY_ORGANIZER_NOT_EMAIL_ADDRESS)) {
            gchar *email = NULL;

            if (e_client_get_backend_property_sync (E_CLIENT (cal_client), CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS, &email, NULL, NULL) &&
                !g_ascii_strcasecmp (email, strip)) {
                g_free (email);

                return TRUE;
            }

            g_free (email);
            return FALSE;
        }

        user_org = itip_address_is_user (registry, strip);
    }

    return user_org;
}

gboolean
itip_sentby_is_user (ESourceRegistry *registry,
                     ECalComponent *comp,
                     ECalClient *cal_client)
{
    ECalComponentOrganizer organizer;
    const gchar *strip;
    gboolean user_sentby = FALSE;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

    if (!e_cal_component_has_organizer (comp) ||
        e_client_check_capability (
        E_CLIENT (cal_client), CAL_STATIC_CAPABILITY_NO_ORGANIZER))
        return FALSE;

    e_cal_component_get_organizer (comp, &organizer);
    if (organizer.sentby != NULL) {
        strip = itip_strip_mailto (organizer.sentby);
        user_sentby = itip_address_is_user (registry, strip);
    }

    return user_sentby;
}

static ECalComponentAttendee *
get_attendee (GSList *attendees,
              gchar *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,
                                         gchar *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 gchar *
html_new_lines_for (const gchar *string)
{
    gchar **lines;
    gchar *joined;

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

    return joined;
}

gchar *
itip_get_comp_attendee (ESourceRegistry *registry,
                        ECalComponent *comp,
                        ECalClient *cal_client)
{
    ESource *source;
    GSList *attendees;
    ECalComponentAttendee *attendee = NULL;
    GList *list, *link;
    const gchar *extension_name;
    gchar *address = NULL;

    e_cal_component_get_attendee_list (comp, &attendees);

    if (cal_client)
        e_client_get_backend_property_sync (
            E_CLIENT (cal_client),
            CAL_BACKEND_PROPERTY_CAL_EMAIL_ADDRESS,
            &address, NULL, NULL);

    if (address != NULL && *address != '\0') {
        attendee = get_attendee (attendees, address);

        if (attendee) {
            gchar *user_email;

            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 != NULL) {
            gchar *user_email;

            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;
    }

    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
    list = e_source_registry_list_enabled (registry, extension_name);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESourceExtension *extension;

        source = E_SOURCE (link->data);

        extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
        extension = e_source_get_extension (source, extension_name);

        address = e_source_mail_identity_dup_address (
            E_SOURCE_MAIL_IDENTITY (extension));

        if (address == NULL)
            continue;

        attendee = get_attendee (attendees, address);
        if (attendee != NULL) {
            gchar *user_email;

            user_email = g_strdup (
                itip_strip_mailto (attendee->value));
            e_cal_component_free_attendee_list (attendees);

            g_free (address);

            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, address);
        if (attendee) {
            gchar *user_email;

            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);
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    /* 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 ? */
    itip_get_default_name_and_address (registry, NULL, &address);

    e_cal_component_free_attendee_list (attendees);

    if (address == NULL)
        address = g_strdup ("");

    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 gchar *
get_label (struct icaltimetype *tt,
           gboolean use_24_hour_format)
{
    gchar buffer[1000];
    struct tm tmp_tm;

    tmp_tm = icaltimetype_to_tm (tt);

    e_time_format_date_and_time (
        &tmp_tm, use_24_hour_format, FALSE, FALSE, buffer, 1000);

    return g_strdup (buffer);
}

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

static void
foreach_tzid_callback (icalparameter *param,
                       gpointer data)
{
    ItipUtilTZData *tz_data = data;
    const gchar *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_client_get_timezone_sync (tz_data->client, tzid, &zone, NULL, 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, (gchar *) tzid, (gchar *) tzid);
}

static icalcomponent *
comp_toplevel_with_zones (ECalComponentItipMethod method,
                          ECalComponent *comp,
                          ECalClient *cal_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 = cal_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 (const GSList *users,
                    const gchar *address)
{
    const GSList *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,
           ESourceRegistry *registry)
{
    ECalComponentOrganizer organizer;
    ECalComponentAttendee *attendee;
    GSList *attendees;
    gchar *from;
    gchar *sender = NULL;

    switch (method) {
    case E_CAL_COMPONENT_METHOD_PUBLISH:
        return NULL;

    case E_CAL_COMPONENT_METHOD_REQUEST:
        return itip_get_comp_attendee (registry, comp, NULL);

    case E_CAL_COMPONENT_METHOD_REPLY:
        sender = itip_get_comp_attendee (registry, 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 (ESourceRegistry *registry,
              ECalComponentItipMethod method,
              ECalComponent *comp,
              const GSList *users,
              gboolean reply_all,
              const GSList *only_attendees)
{
    ECalComponentOrganizer organizer;
    GSList *attendees, *l;
    GPtrArray *array = NULL;
    EDestination *destination;
    gint len;
    gchar *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 (registry, comp, NULL);

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

            /* Bugfix: 688711 - Varadhan
             * Resource is also considered as a "attendee". If the respective backend
             * is able to successfully book resources automagically, it will appear
             * in the users list and thereby won't get added to the list of destinations
             * to send the meeting invite, otherwise, as a safety measure, a meeting
             * invite will be sent to the resources as well. */
            if (att->cutype != ICAL_CUTYPE_INDIVIDUAL &&
                att->cutype != ICAL_CUTYPE_GROUP &&
                att->cutype != ICAL_CUTYPE_RESOURCE &&
                att->cutype != ICAL_CUTYPE_UNKNOWN)
                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;
            else if (only_attendees &&
                !comp_editor_have_in_new_attendees_lst (
                only_attendees, itip_strip_mailto (att->value)))
                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 ();

            sender = itip_get_comp_attendee (registry, comp, NULL);

            e_cal_component_get_organizer (comp, &organizer);
            if (organizer.value && (!sender || g_ascii_strcasecmp (
                itip_strip_mailto (organizer.value), sender) != 0)) {
                destination = e_destination_new ();
                e_destination_set_email (
                    destination,
                    itip_strip_mailto (organizer.value));
                if (organizer.cn)
                    e_destination_set_name (destination, organizer.cn);
                g_ptr_array_add (array, destination);
            }

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

                if (!att->value)
                    continue;
                else if (att->cutype != ICAL_CUTYPE_INDIVIDUAL &&
                     att->cutype != ICAL_CUTYPE_GROUP &&
                     att->cutype != ICAL_CUTYPE_UNKNOWN)
                    continue;
                else if (only_attendees &&
                    !comp_editor_have_in_new_attendees_lst (
                    only_attendees, itip_strip_mailto (att->value)))
                    continue;
                else if (organizer.value &&
                     g_ascii_strcasecmp (att->value, organizer.value) == 0)
                    continue;
                else if (sender && g_ascii_strcasecmp (
                    itip_strip_mailto (att->value), sender) == 0)
                    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.cn)
                e_destination_set_name (destination, organizer.cn);
            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 (registry, 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 &&
                att->cutype != ICAL_CUTYPE_UNKNOWN)
                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) {
            const GSList *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;

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

    return convert.destinations;
}

static gchar *
comp_subject (ESourceRegistry *registry,
              ECalComponentItipMethod method,
              ECalComponent *comp)
{
    ECalComponentText caltext;
    const gchar *description, *prefix = NULL;
    GSList *alist, *l;
    gchar *subject;
    gchar *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");
            break;
        case E_CAL_COMPONENT_TODO:
            description = _("Task information");
            break;
        case E_CAL_COMPONENT_JOURNAL:
            description = _("Memo information");
            break;
        case E_CAL_COMPONENT_FREEBUSY:
            description = _("Free/Busy information");
            break;
        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 (registry, 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 (a != NULL) {

            switch (a->status) {
            case ICAL_PARTSTAT_ACCEPTED:
                /* Translators: This is part of the subject
                 * line of a meeting request or update email.
                 * The full subject line would be:
                 * "Accepted: Meeting Name". */
                prefix = C_("Meeting", "Accepted");
                break;
            case ICAL_PARTSTAT_TENTATIVE:
                /* Translators: This is part of the subject
                 * line of a meeting request or update email.
                 * The full subject line would be:
                 * "Tentatively Accepted: Meeting Name". */
                prefix = C_("Meeting", "Tentatively Accepted");
                break;
            case ICAL_PARTSTAT_DECLINED:
                /* Translators: This is part of the subject
                 * line of a meeting request or update email.
                 * The full subject line would be:
                 * "Declined: Meeting Name". */
                prefix = C_("Meeting", "Declined");
                break;
            case ICAL_PARTSTAT_DELEGATED:
                /* Translators: This is part of the subject
                 * line of a meeting request or update email.
                 * The full subject line would be:
                 * "Delegated: Meeting Name". */
                prefix = C_("Meeting", "Delegated");
                break;
            default:
                break;
            }
            e_cal_component_free_attendee_list (alist);
        }
        break;

    case E_CAL_COMPONENT_METHOD_ADD:
        /* Translators: This is part of the subject line of a
         * meeting request or update email.  The full subject
         * line would be: "Updated: Meeting Name". */
        prefix = C_("Meeting", "Updated");
        break;

    case E_CAL_COMPONENT_METHOD_CANCEL:
        /* Translators: This is part of the subject line of a
         * meeting request or update email.  The full subject
         * line would be: "Cancel: Meeting Name". */
        prefix = C_("Meeting", "Cancel");
        break;

    case E_CAL_COMPONENT_METHOD_REFRESH:
        /* Translators: This is part of the subject line of a
         * meeting request or update email.  The full subject
         * line would be: "Refresh: Meeting Name". */
        prefix = C_("Meeting", "Refresh");
        break;

    case E_CAL_COMPONENT_METHOD_COUNTER:
        /* Translators: This is part of the subject line of a
         * meeting request or update email.  The full subject
         * line would be: "Counter-proposal: Meeting Name". */
        prefix = C_("Meeting", "Counter-proposal");
        break;

    case E_CAL_COMPONENT_METHOD_DECLINECOUNTER:
        /* Translators: This is part of the subject line of a
         * meeting request or update email.  The full subject
         * line would be: "Declined: Meeting Name". */
        prefix = C_("Meeting", "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)
{
    const gchar *name;

    if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_FREEBUSY)
        name = "freebusy.ifb";
    else
        name = "calendar.ics";

    return g_strdup_printf (
        "text/calendar; name=\"%s\"; charset=utf-8; METHOD=%s",
        name, 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,
                  gboolean use_24_hour_format)
{
    gchar *description;
    ECalComponentDateTime dt;
    gchar *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, use_24_hour_format);
        e_cal_component_free_datetime (&dt);

        e_cal_component_get_dtend (comp, &dt);
        if (dt.value)
            end = get_label (dt.value, use_24_hour_format);
        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,
                  ECalClient *cal_client,
                  icalcomponent *zones,
                  GSList **users)
{
    icalcomponent *top_level, *returned_icalcomp = NULL;
    gboolean retval = TRUE;
    GError *error = NULL;

    top_level = comp_toplevel_with_zones (method, comp, cal_client, zones);
    d (printf ("itip-utils.c: comp_server_send: calling e_cal_send_objects... \n"));
    if (!e_cal_client_send_objects_sync (cal_client, top_level, users, &returned_icalcomp, NULL, &error)) {
        /* FIXME Really need a book problem status code */
        d (printf ("itip-utils.c: return value from e_cal_send_objects is: %d", error->code));
        if (error) {
            if (g_error_matches (error, E_CAL_CLIENT_ERROR, E_CAL_CLIENT_ERROR_OBJECT_ID_ALREADY_EXISTS)) {
                e_notice (
                    NULL, GTK_MESSAGE_ERROR,
                    _("Unable to book a resource, the "
                    "new event collides with some other."));
            } else {
                e_notice (
                    NULL, GTK_MESSAGE_ERROR,
                    _("Unable to book a resource, error: %s"), error->message);
            }

            retval = FALSE;
        }
    } else {
      d (printf ("itip-utils.c: e_cal_send_objects returned without errors\n"));
    }

    g_clear_error (&error);

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

    return retval;
}

static gboolean
comp_limit_attendees (ESourceRegistry *registry,
                      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))
    {
        gchar *attendee;
        gchar *attendee_text;
        icalparameter *param;
        const gchar *attendee_sentby;
        gchar *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_r (prop);
        if (!attendee)
            continue;

        attendee_text = g_strdup (itip_strip_mailto (attendee));
        g_free (attendee);
        attendee_text = g_strstrip (attendee_text);
        found = match = itip_address_is_user (registry, attendee_text);

        if (!found) {
            param = icalproperty_get_first_parameter (prop, ICAL_SENTBY_PARAMETER);
            if (param) {
                attendee_sentby =
                    icalparameter_get_sentby (param);
                attendee_sentby =
                    itip_strip_mailto (attendee_sentby);
                attendee_sentby_text =
                    g_strstrip (g_strdup (attendee_sentby));
                found = match = itip_address_is_user (
                    registry, attendee_sentby_text);
            }
        }

        g_free (attendee_text);
        g_free (attendee_sentby_text);

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

    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,
             ECalClient *cal_client,
             ESourceRegistry *registry)
{
    ECalComponentOrganizer organizer;
    GSList * attendees, *l;
    gchar *name;
    gchar *address;
    gchar *user = NULL;

    itip_get_default_name_and_address (registry, &name, &address);

    e_cal_component_get_organizer (comp, &organizer);
    if (!organizer.value && name != NULL && address != NULL) {
        organizer.value = g_strdup_printf ("MAILTO:%s", address);
        organizer.sentby = NULL;
        organizer.cn = name;
        organizer.language = NULL;

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

        g_free (name);
        g_free (address);
        return;
    }

    e_cal_component_get_attendee_list (comp, &attendees);
    user = itip_get_comp_attendee (registry, comp, cal_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);

            g_free (name);
            g_free (address);
            return;
        }
    }

    if (!itip_organizer_is_user (registry, comp, cal_client) &&
        !itip_sentby_is_user (registry, comp, cal_client) &&
        address != NULL) {
        organizer.value = g_strdup (organizer.value);
        organizer.sentby = g_strdup_printf ("MAILTO:%s", address);
        organizer.cn = g_strdup (organizer.cn);
        organizer.language = g_strdup (organizer.language);

        e_cal_component_set_organizer (comp, &organizer);

        g_free ((gchar *) organizer.value);
        g_free ((gchar *) organizer.sentby);
        g_free ((gchar *) organizer.cn);
        g_free ((gchar *) organizer.language);
    }

    g_free (name);
    g_free (address);
}

static ECalComponent *
comp_minimal (ESourceRegistry *registry,
              ECalComponent *comp,
              gboolean attendee)
{
    ECalComponent *clone;
    icalcomponent *icomp, *icomp_clone;
    icalproperty *prop;
    ECalComponentOrganizer organizer;
    const gchar *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 (registry, 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 void
strip_x_microsoft_props (ECalComponent *comp)
{
    GSList *lst = NULL, *l;
    icalcomponent *icalcomp;
    icalproperty *icalprop;

    g_return_if_fail (comp != NULL);

    icalcomp = e_cal_component_get_icalcomponent (comp);
    g_return_if_fail (icalcomp != NULL);

    for (icalprop = icalcomponent_get_first_property (icalcomp, ICAL_X_PROPERTY);
         icalprop;
         icalprop = icalcomponent_get_next_property (icalcomp, ICAL_X_PROPERTY)) {
        const gchar *x_name = icalproperty_get_x_name (icalprop);

        if (x_name && g_ascii_strncasecmp (x_name, "X-MICROSOFT-", 12) == 0)
            lst = g_slist_prepend (lst, icalprop);
    }

    for (l = lst; l != NULL; l = l->next) {
        icalprop = l->data;
        icalcomponent_remove_property (icalcomp, icalprop);
        icalproperty_free (icalprop);
    }

    g_slist_free (lst);
}

static ECalComponent *
comp_compliant (ESourceRegistry *registry,
                ECalComponentItipMethod method,
                ECalComponent *comp,
                ECalClient *client,
                icalcomponent *zones,
                icaltimezone *default_zone,
                gboolean strip_alarms)
{
    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 = default_zone;
            } 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_client_get_timezone_sync (
                        client, dt.tzid,
                        &from_zone, NULL, 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 if requested, even this helps with outlook */
    if (strip_alarms) {
        e_cal_component_remove_all_alarms (clone);
    } else {
        /* Always strip procedure alarms, because of security */
        GList *uids, *l;

        uids = e_cal_component_get_alarm_uids (clone);

        for (l = uids; l; l = l->next) {
            ECalComponentAlarm *alarm;
            ECalComponentAlarmAction action = E_CAL_COMPONENT_ALARM_UNKNOWN;

            alarm = e_cal_component_get_alarm (clone, (const gchar *) l->data);
            if (alarm) {
                e_cal_component_alarm_get_action (alarm, &action);
                e_cal_component_alarm_free (alarm);

                if (action == E_CAL_COMPONENT_ALARM_PROCEDURE)
                    e_cal_component_remove_alarm (clone, (const gchar *) l->data);
            }
        }

        cal_obj_uid_list_free (uids);
    }

    strip_x_microsoft_props (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, registry);
        e_cal_component_set_attendee_list (clone, NULL);
        break;
    case E_CAL_COMPONENT_METHOD_REQUEST:
        comp_sentby (clone, client, registry);
        break;
    case E_CAL_COMPONENT_METHOD_CANCEL:
        comp_sentby (clone, client, registry);
        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 (registry, 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 (registry, 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->content_id)
            camel_mime_part_set_content_id (
                attachment, mime_attach->content_id);
        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);
        g_object_unref (attachment);

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

    g_slist_free (attach_list);
}

static ESource *
find_enabled_identity (ESourceRegistry *registry,
                       const gchar *id_address)
{
    GList *list, *link;
    ESource *mail_identity = NULL;
    const gchar *extension_name;

    if (id_address == NULL)
        return NULL;

    extension_name = E_SOURCE_EXTENSION_MAIL_IDENTITY;
    list = e_source_registry_list_enabled (registry, extension_name);

    for (link = list; link != NULL; link = g_list_next (link)) {
        ESource *source = E_SOURCE (link->data);
        ESourceMailIdentity *extension;
        const gchar *address;

        extension = e_source_get_extension (source, extension_name);
        address = e_source_mail_identity_get_address (extension);

        if (address == NULL)
            continue;

        if (g_ascii_strcasecmp (address, id_address) == 0) {
            mail_identity = g_object_ref (source);
            break;
        }
    }

    g_list_free_full (list, (GDestroyNotify) g_object_unref);

    return mail_identity;
}

static void
setup_from (ECalComponentItipMethod method,
            ECalComponent *comp,
            ECalClient *cal_client,
            EComposerHeaderTable *table)
{
    EClientCache *client_cache;
    ESourceRegistry *registry;
    ESource *source = NULL;

    client_cache = e_composer_header_table_ref_client_cache (table);
    registry = e_client_cache_ref_registry (client_cache);

    /* always use organizer's email when user is an organizer */
    if (itip_organizer_is_user (registry, comp, cal_client)) {
        ECalComponentOrganizer organizer = {0};

        e_cal_component_get_organizer (comp, &organizer);
        if (organizer.value != NULL)
            source = find_enabled_identity (
                registry,
                itip_strip_mailto (organizer.value));
    }

    if (source == NULL) {
        gchar *from = comp_from (method, comp, registry);

        if (from != NULL)
            source = find_enabled_identity (registry, from);

        g_free (from);
    }

    if (source != NULL) {
        const gchar *uid;

        uid = e_source_get_uid (source);
        e_composer_header_table_set_identity_uid (table, uid);

        g_object_unref (source);
    }

    g_object_unref (client_cache);
    g_object_unref (registry);
}

gboolean
itip_send_comp (ESourceRegistry *registry,
                ECalComponentItipMethod method,
                ECalComponent *send_comp,
                ECalClient *cal_client,
                icalcomponent *zones,
                GSList *attachments_list,
                GSList *users,
                gboolean strip_alarms,
                gboolean only_new_attendees)
{
    EShell *shell;
    GSettings *settings;
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    EDestination **destinations;
    ECalComponent *comp = NULL;
    icalcomponent *top_level = NULL;
    icaltimezone *default_zone;
    gchar *ical_string = NULL;
    gchar *content_type = NULL;
    gchar *subject = NULL;
    gboolean use_24_hour_format;
    gboolean retval = FALSE;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

    /* FIXME Pass this in. */
    shell = e_shell_get_default ();

    settings = g_settings_new ("org.gnome.evolution.calendar");

    use_24_hour_format =
        g_settings_get_boolean (settings, "use-24hour-format");

    g_object_unref (settings);

    default_zone = e_cal_client_get_default_timezone (cal_client);

    /* check whether backend could handle auto-saving requests/updates */
    if (method != E_CAL_COMPONENT_METHOD_PUBLISH && e_cal_client_check_save_schedules (cal_client))
        return TRUE;

    /* Give the server a chance to manipulate the comp */
    if (method != E_CAL_COMPONENT_METHOD_PUBLISH) {
        d (printf ("itip-utils.c: itip_send_comp: calling comp_server_send... \n"));
        if (!comp_server_send (method, send_comp, cal_client, zones, &users))
            goto cleanup;
    }

    /* check whether backend could handle sending requests/updates */
    if (method != E_CAL_COMPONENT_METHOD_PUBLISH &&
        e_client_check_capability (
            E_CLIENT (cal_client),
        CAL_STATIC_CAPABILITY_CREATE_MESSAGES)) {
        if (users) {
            g_slist_foreach (users, (GFunc) g_free, NULL);
            g_slist_free (users);
        }
        return TRUE;
    }

    /* Tidy up the comp */
    comp = comp_compliant (
        registry, method, send_comp, cal_client,
        zones, default_zone, strip_alarms);

    if (comp == NULL)
        goto cleanup;

    /* Recipients */
    destinations = comp_to_list (
        registry, method, comp, users, FALSE,
        only_new_attendees ?  g_object_get_data (
        G_OBJECT (send_comp), "new-attendees") : NULL);
    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 (registry, method, comp);

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

    setup_from (method, send_comp, cal_client, table);
    e_composer_header_table_set_subject (table, subject);
    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, cal_client, zones);
    ical_string = icalcomponent_as_ical_string_r (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, use_24_hour_format);

        body = camel_text_to_html (
            description, CAMEL_MIME_FILTER_TOHTML_PRE, 0);
        e_msg_composer_set_body_text (composer, body, TRUE);
        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);
        g_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_slist_foreach (users, (GFunc) g_free, NULL);
        g_slist_free (users);
    }

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

    return retval;
}

gboolean
reply_to_calendar_comp (ESourceRegistry *registry,
                        ECalComponentItipMethod method,
                        ECalComponent *send_comp,
                        ECalClient *cal_client,
                        gboolean reply_all,
                        icalcomponent *zones,
                        GSList *attachments_list)
{
    EShell *shell;
    EMsgComposer *composer;
    EComposerHeaderTable *table;
    EDestination **destinations;
    ECalComponent *comp = NULL;
    icalcomponent *top_level = NULL;
    icaltimezone *default_zone;
    GSList *users = NULL;
    gchar *subject = NULL;
    gchar *ical_string = NULL;
    gboolean retval = FALSE;

    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), FALSE);

    /* FIXME Pass this in. */
    shell = e_shell_get_default ();

    default_zone = e_cal_client_get_default_timezone (cal_client);

    /* Tidy up the comp */
    comp = comp_compliant (
        registry, method, send_comp, cal_client,
        zones, default_zone, TRUE);
    if (comp == NULL)
        goto cleanup;

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

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

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

    setup_from (method, send_comp, cal_client, table);
    e_composer_header_table_set_subject (table, subject);
    e_composer_header_table_set_destinations_to (table, destinations);

    e_destination_freev (destinations);

    top_level = comp_toplevel_with_zones (method, comp, cal_client, zones);
    ical_string = icalcomponent_as_ical_string_r (top_level);

    if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_EVENT) {

        GString *body;
        gchar *orig_from = NULL;
        const gchar *description = NULL;
        gchar *subject = NULL;
        const gchar *location = NULL;
        gchar *time = NULL;
        gchar *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 = 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 && dtstart.tzid) {
                GError *error = NULL;

                e_cal_client_get_timezone_sync (
                    cal_client, dtstart.tzid,
                    &start_zone, NULL, &error);

                if (error != NULL) {
                    g_warning (
                        "%s: Couldn't get timezone '%s' from server: %s",
                        G_STRFUNC,
                        dtstart.tzid ? dtstart.tzid : "",
                        error->message);
                    g_error_free (error);
                }
            }

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

            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, TRUE);
        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_slist_foreach (users, (GFunc) g_free, NULL);
        g_slist_free (users);
    }

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

gboolean
itip_publish_begin (ECalComponent *pub_comp,
                    ECalClient *cal_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);
        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,
         gint fb_count)
{
    gint 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 gchar *uid,  *comment;
    struct icaltimetype itt;
    gint 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;
}

gboolean
itip_publish_comp (ECalClient *cal_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;
    gchar *ical_string = NULL;
    EProxy *proxy;

    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 ();
    g_object_set (session, SOUP_SESSION_TIMEOUT, 90, NULL);

    proxy = e_proxy_new ();
    e_proxy_setup_proxy (proxy);

    if (e_proxy_require_proxy_for_uri (proxy, uri)) {
        SoupURI *proxy_uri;

        proxy_uri = e_proxy_peek_uri_for (proxy, uri);

        g_object_set (session, SOUP_SESSION_PROXY_URI, proxy_uri, NULL);
    }

    g_clear_object (&proxy);

    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_r (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)
{
    if (!icalcomp || !icalcomponent_is_valid (icalcomp))
        return FALSE;

    switch (icalcomponent_isa (icalcomp)) {
    case ICAL_VEVENT_COMPONENT:
        return  check_time (icalcomponent_get_dtstart (icalcomp), FALSE) &&
            check_time (icalcomponent_get_dtend (icalcomp), TRUE);
    case ICAL_VTODO_COMPONENT:
        return  check_time (icalcomponent_get_dtstart (icalcomp), TRUE) &&
            check_time (icalcomponent_get_due (icalcomp), TRUE);
    case ICAL_VJOURNAL_COMPONENT:
        return  check_time (icalcomponent_get_dtstart (icalcomp), TRUE) &&
            check_time (icalcomponent_get_dtend (icalcomp), TRUE);
    default:
        break;
    }

    return TRUE;
}