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.
14 #include <sys/types.h>
21 #include "citserver.h"
22 #include "sysdep_decls.h"
26 #ifdef CITADEL_WITH_CALENDAR_SERVICE
28 #include "ical_dezonify.h"
32 * Figure out which time zone needs to be used for timestamps that are
33 * not UTC and do not have a time zone specified.
35 icaltimezone *get_default_icaltimezone(void)
37 icaltimezone *zone = NULL;
40 zone = icaltimezone_get_builtin_timezone(config.c_default_cal_zone);
43 zone = icaltimezone_get_utc_timezone();
50 * Back end function for ical_dezonify()
52 * We supply this with the master component, the relevant component,
53 * and the property (which will be a DTSTART, DTEND, etc.)
54 * which we want to convert to UTC.
56 void ical_dezonify_backend(icalcomponent *cal,
61 icaltimezone *t = NULL;
64 struct icaltimetype TheTime;
66 /* Give me nothing and I will give you nothing in return. */
67 if (cal == NULL) return;
69 /* Hunt for a TZID parameter in this property. */
70 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
72 /* Get the stringish name of this TZID. */
74 tzid = icalparameter_get_tzid(param);
76 /* Convert it to an icaltimezone type. */
78 t = icalcomponent_get_timezone(cal, tzid);
83 /* Now we know the timezone. Convert to UTC. */
85 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
86 TheTime = icalproperty_get_dtstart(prop);
88 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
89 TheTime = icalproperty_get_dtend(prop);
91 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
92 TheTime = icalproperty_get_due(prop);
94 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
95 TheTime = icalproperty_get_exdate(prop);
101 lprintf(CTDL_DEBUG, " * Was: %s\n", icaltime_as_ical_string(TheTime));
102 if (TheTime.is_utc) {
103 lprintf(CTDL_DEBUG, " * This property is ALREADY UTC.\n");
106 /* Do the conversion. */
108 lprintf(CTDL_DEBUG, " * Timezone prop found. Converting to UTC.\n");
111 lprintf(CTDL_DEBUG, " * Converting default timezone to UTC.\n");
115 t = get_default_icaltimezone();
118 icaltimezone_convert_time(&TheTime,
120 icaltimezone_get_utc_timezone()
125 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
126 lprintf(CTDL_DEBUG, " * Now: %s\n", icaltime_as_ical_string(TheTime));
128 /* Now add the converted property back in. */
129 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
130 icalproperty_set_dtstart(prop, TheTime);
132 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
133 icalproperty_set_dtend(prop, TheTime);
135 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
136 icalproperty_set_due(prop, TheTime);
138 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
139 icalproperty_set_exdate(prop, TheTime);
145 * Recursive portion of ical_dezonify()
147 void ical_dezonify_recur(icalcomponent *cal, icalcomponent *rcal) {
152 * Recurse through all subcomponents *except* VTIMEZONE ones.
154 for (c=icalcomponent_get_first_component(
155 rcal, ICAL_ANY_COMPONENT);
157 c = icalcomponent_get_next_component(
158 rcal, ICAL_ANY_COMPONENT)
160 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
161 ical_dezonify_recur(cal, c);
166 * Now look for DTSTART and DTEND properties
168 for (p=icalcomponent_get_first_property(
169 rcal, ICAL_ANY_PROPERTY);
171 p = icalcomponent_get_next_property(
172 rcal, ICAL_ANY_PROPERTY)
175 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
176 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
177 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
178 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
180 ical_dezonify_backend(cal, rcal, p);
187 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
188 * This function will search any VTIMEZONE subcomponents to learn the
189 * relevant timezone information.
191 void ical_dezonify(icalcomponent *cal) {
192 icalcomponent *vt = NULL;
194 lprintf(CTDL_DEBUG, "ical_dezonify() started\n");
196 /* Convert all times to UTC */
197 ical_dezonify_recur(cal, cal);
199 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
200 while (vt = icalcomponent_get_first_component(
201 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
202 icalcomponent_remove_component(cal, vt);
203 icalcomponent_free(vt);
206 lprintf(CTDL_DEBUG, "ical_dezonify() completed\n");
210 #endif /* CITADEL_WITH_CALENDAR_SERVICE */