[evolution] itip-utils: Clamp the VTIMEZONE component of the sent component

[Milan Crha <mcrha src gnome org>]

commit a80b39e163abe1067680f7adb703d2934a3c154b
Author: Milan Crha <mcrha redhat com>
Date:   Thu Feb 18 14:28:02 2021 +0100

    itip-utils: Clamp the VTIMEZONE component of the sent component
    
    Let the VTIMEZONE component of the result string be with only the relevant
    parts for the used ICalComponent, to save bandwidth and disk space.

 src/calendar/gui/itip-utils.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
---
diff --git a/src/calendar/gui/itip-utils.c b/src/calendar/gui/itip-utils.c
index 436e601b51..b26b64ac78 100644
--- a/src/calendar/gui/itip-utils.c
+++ b/src/calendar/gui/itip-utils.c
@@ -720,6 +720,8 @@ typedef struct {
        ICalComponent *icomp;
        ECalClient *client;
        ICalComponent *zones;
+       ICalTime *clamp_vtimezone_from;
+       ICalTime *clamp_vtimezone_to;
 } ItipUtilTZData;
 
 static void
@@ -790,6 +792,9 @@ foreach_tzid_callback (ICalParameter *param,
        if (!tzcomp)
                tzcomp = i_cal_component_clone (vtimezone_comp);
 
+       if (tz_data->clamp_vtimezone_from)
+               e_cal_util_clamp_vtimezone (tzcomp, tz_data->clamp_vtimezone_from, 
tz_data->clamp_vtimezone_to);
+
        i_cal_component_take_component (tz_data->icomp, tzcomp);
        g_hash_table_insert (tz_data->tzids, tzid_dup ? tzid_dup : g_strdup (tzid), g_strdup (location));
        g_object_unref (vtimezone_comp);
@@ -804,8 +809,11 @@ comp_toplevel_with_zones (ICalPropertyMethod method,
        ICalComponent *top_level, *icomp;
        ICalProperty *prop;
        ItipUtilTZData tz_data;
+       ECalComponentDateTime *dt;
        GSList *link;
 
+       g_return_val_if_fail (ecomps != NULL, NULL);
+
        top_level = e_cal_util_new_top_level ();
 
        prop = i_cal_property_new_method (method);
@@ -815,6 +823,26 @@ comp_toplevel_with_zones (ICalPropertyMethod method,
        tz_data.icomp = top_level;
        tz_data.client = cal_client;
        tz_data.zones = zones;
+       tz_data.clamp_vtimezone_from = NULL;
+       tz_data.clamp_vtimezone_to = NULL;
+
+       dt = e_cal_component_get_dtstart (ecomps->data);
+       if (dt && e_cal_component_datetime_get_value (dt))
+               tz_data.clamp_vtimezone_from = i_cal_time_clone (e_cal_component_datetime_get_value (dt));
+       e_cal_component_datetime_free (dt);
+
+       if (tz_data.clamp_vtimezone_from && !ecomps->next &&
+           !e_cal_component_has_rrules (ecomps->data)) {
+               dt = e_cal_component_get_dtend (ecomps->data);
+
+               if (dt && e_cal_component_datetime_get_value (dt))
+                       tz_data.clamp_vtimezone_to = i_cal_time_clone (e_cal_component_datetime_get_value 
(dt));
+
+               if (!tz_data.clamp_vtimezone_to)
+                       tz_data.clamp_vtimezone_to = g_object_ref (tz_data.clamp_vtimezone_from);
+
+               e_cal_component_datetime_free (dt);
+       }
 
        for (link = (GSList *) ecomps; link; link = g_slist_next (link)) {
                icomp = e_cal_component_get_icalcomponent (link->data);
@@ -826,6 +854,8 @@ comp_toplevel_with_zones (ICalPropertyMethod method,
        }
 
        g_hash_table_destroy (tz_data.tzids);
+       g_clear_object (&tz_data.clamp_vtimezone_from);
+       g_clear_object (&tz_data.clamp_vtimezone_to);
 
        return top_level;
 }