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,
60 icaltimezone *t = NULL;
62 const char *tzid = NULL;
63 struct icaltimetype TheTime;
64 int utc_declared_as_tzid = 0; /**< Component declared 'TZID=GMT' instead of using Z syntax */
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 lprintf(9, " * Stringy supplied timezone is: '%s'\n", tzid);
79 if ( (!strcasecmp(tzid, "UTC")) || (!strcasecmp(tzid, "GMT")) ) {
80 utc_declared_as_tzid = 1;
81 lprintf(9, " * ...and we handle that internally.\n");
84 t = icalcomponent_get_timezone(cal, tzid);
85 lprintf(9, " * ...and I %s have tzdata for that zone.\n",
93 /* Now we know the timezone. Convert to UTC. */
95 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
96 TheTime = icalproperty_get_dtstart(prop);
98 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
99 TheTime = icalproperty_get_dtend(prop);
101 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
102 TheTime = icalproperty_get_due(prop);
104 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
105 TheTime = icalproperty_get_exdate(prop);
111 lprintf(9, " * Was: %s\n", icaltime_as_ical_string(TheTime));
113 if (TheTime.is_utc) {
114 lprintf(9, " * This property is ALREADY UTC.\n");
117 else if (utc_declared_as_tzid) {
118 lprintf(9, " * Replacing '%s' TZID with 'Z' suffix.\n", tzid);
123 /* Do the conversion. */
125 lprintf(9, " * Timezone prop found. Converting to UTC.\n");
128 lprintf(9, " * Converting default timezone to UTC.\n");
132 t = get_default_icaltimezone();
135 icaltimezone_convert_time(&TheTime,
137 icaltimezone_get_utc_timezone()
142 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
143 lprintf(9, " * Now: %s\n", icaltime_as_ical_string(TheTime));
145 /* Now add the converted property back in. */
146 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
147 icalproperty_set_dtstart(prop, TheTime);
149 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
150 icalproperty_set_dtend(prop, TheTime);
152 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
153 icalproperty_set_due(prop, TheTime);
155 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
156 icalproperty_set_exdate(prop, TheTime);
162 * Recursive portion of ical_dezonify()
164 void ical_dezonify_recurse(icalcomponent *cal, icalcomponent *rcal) {
169 * Recurse through all subcomponents *except* VTIMEZONE ones.
171 for (c=icalcomponent_get_first_component(
172 rcal, ICAL_ANY_COMPONENT);
174 c = icalcomponent_get_next_component(
175 rcal, ICAL_ANY_COMPONENT)
177 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
178 ical_dezonify_recurse(cal, c);
183 * Now look for DTSTART and DTEND properties
185 for (p=icalcomponent_get_first_property(rcal, ICAL_ANY_PROPERTY);
187 p = icalcomponent_get_next_property(rcal, ICAL_ANY_PROPERTY)
190 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
191 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
192 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
193 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
195 ical_dezonify_backend(cal, rcal, p);
202 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
203 * This function will search any VTIMEZONE subcomponents to learn the
204 * relevant timezone information.
206 void ical_dezonify(icalcomponent *cal) {
207 icalcomponent *vt = NULL;
209 lprintf(9, "ical_dezonify() started\n");
211 /* Convert all times to UTC */
212 ical_dezonify_recurse(cal, cal);
214 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
215 while (vt = icalcomponent_get_first_component(
216 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
217 icalcomponent_remove_component(cal, vt);
218 icalcomponent_free(vt);
221 lprintf(9, "ical_dezonify() completed\n");
225 #endif /* CITADEL_WITH_CALENDAR_SERVICE */