4 * Function to go through an ical component set and convert all non-UTC
5 * date/time properties to UTC. It also strips out any VTIMEZONE
6 * subcomponents afterwards, because they're irrelevant.
13 #include <sys/types.h>
20 #include "citserver.h"
21 #include "sysdep_decls.h"
25 #ifdef CITADEL_WITH_CALENDAR_SERVICE
27 #include "ical_dezonify.h"
31 * Back end function for ical_dezonify()
33 * We supply this with the master component, the relevant component,
34 * and the property (which will be a DTSTART, DTEND, etc.)
35 * which we want to convert to UTC.
37 void ical_dezonify_backend(icalcomponent *cal,
41 icaltimezone *t = NULL;
44 struct icaltimetype TheTime;
46 /* Give me nothing and I will give you nothing in return. */
47 if (cal == NULL) return;
49 /* Hunt for a TZID parameter in this property. */
50 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
52 /* Get the stringish name of this TZID. */
54 tzid = icalparameter_get_tzid(param);
56 /* Convert it to an icaltimezone type. */
58 t = icalcomponent_get_timezone(cal, tzid);
63 /* Now we know the timezone. Convert to UTC. */
65 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
66 TheTime = icalproperty_get_dtstart(prop);
68 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
69 TheTime = icalproperty_get_dtend(prop);
71 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
72 TheTime = icalproperty_get_due(prop);
74 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
75 TheTime = icalproperty_get_exdate(prop);
81 /* Do the conversion. */
83 icaltimezone_convert_time(&TheTime,
85 icaltimezone_get_utc_timezone()
89 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
91 /* Now add the converted property back in. */
92 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
93 icalproperty_set_dtstart(prop, TheTime);
95 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
96 icalproperty_set_dtend(prop, TheTime);
98 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
99 icalproperty_set_due(prop, TheTime);
101 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
102 icalproperty_set_exdate(prop, TheTime);
108 * Recursive portion of ical_dezonify()
110 void ical_dezonify_recur(icalcomponent *cal, icalcomponent *rcal) {
115 * Recurse through all subcomponents *except* VTIMEZONE ones.
117 for (c=icalcomponent_get_first_component(
118 rcal, ICAL_ANY_COMPONENT);
120 c = icalcomponent_get_next_component(
121 rcal, ICAL_ANY_COMPONENT)
123 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
124 ical_dezonify_recur(cal, c);
129 * Now look for DTSTART and DTEND properties
131 for (p=icalcomponent_get_first_property(
132 rcal, ICAL_ANY_PROPERTY);
134 p = icalcomponent_get_next_property(
135 rcal, ICAL_ANY_PROPERTY)
138 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
139 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
140 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
141 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
143 ical_dezonify_backend(cal, rcal, p);
150 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
151 * This function will search any VTIMEZONE subcomponents to learn the
152 * relevant timezone information.
154 void ical_dezonify(icalcomponent *cal) {
155 icalcomponent *vt = NULL;
157 /* Convert all times to UTC */
158 ical_dezonify_recur(cal, cal);
160 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
161 while (vt = icalcomponent_get_first_component(
162 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
163 icalcomponent_remove_component(cal, vt);
164 icalcomponent_free(vt);
170 #endif /* CITADEL_WITH_CALENDAR_SERVICE */