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.
8 * Everything here will work on both a fully encapsulated VCALENDAR component
9 * or any type of subcomponent.
14 #include "webserver.h"
18 * Figure out which time zone needs to be used for timestamps that are
19 * not UTC and do not have a time zone specified.
22 icaltimezone *get_default_icaltimezone(void) {
24 icaltimezone *zone = NULL;
25 char *default_zone_name = serv_info.serv_default_cal_zone;
28 zone = icaltimezone_get_builtin_timezone(default_zone_name);
31 lprintf(1, "Unable to load '%s' time zone. Defaulting to UTC.\n", default_zone_name);
32 zone = icaltimezone_get_utc_timezone();
35 lprintf(1, "Unable to load UTC time zone!\n");
42 * Back end function for ical_dezonify()
44 * We supply this with the master component, the relevant component,
45 * and the property (which will be a DTSTART, DTEND, etc.)
46 * which we want to convert to UTC.
48 void ical_dezonify_backend(icalcomponent *cal,
52 icaltimezone *t = NULL;
54 const char *tzid = NULL;
55 struct icaltimetype TheTime;
56 int utc_declared_as_tzid = 0; /* Component declared 'TZID=GMT' instead of using Z syntax */
58 /* Give me nothing and I will give you nothing in return. */
59 if (cal == NULL) return;
61 /* Hunt for a TZID parameter in this property. */
62 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
64 /* Get the stringish name of this TZID. */
66 tzid = icalparameter_get_tzid(param);
68 /* Convert it to an icaltimezone type. */
71 lprintf(9, " * Stringy supplied timezone is: '%s'\n", tzid);
73 if ( (!strcasecmp(tzid, "UTC")) || (!strcasecmp(tzid, "GMT")) ) {
74 utc_declared_as_tzid = 1;
76 lprintf(9, " * ...and we handle that internally.\n");
80 t = icalcomponent_get_timezone(cal, tzid);
82 lprintf(9, " * ...and I %s have tzdata for that zone.\n",
91 /* Now we know the timezone. Convert to UTC. */
93 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
94 TheTime = icalproperty_get_dtstart(prop);
96 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
97 TheTime = icalproperty_get_dtend(prop);
99 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
100 TheTime = icalproperty_get_due(prop);
102 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
103 TheTime = icalproperty_get_exdate(prop);
110 lprintf(9, " * Was: %s\n", icaltime_as_ical_string(TheTime));
113 if (TheTime.is_utc) {
115 lprintf(9, " * This property is ALREADY UTC.\n");
119 else if (utc_declared_as_tzid) {
121 lprintf(9, " * Replacing '%s' TZID with 'Z' suffix.\n", tzid);
127 /* Do the conversion. */
130 lprintf(9, " * Timezone prop found. Converting to UTC.\n");
135 lprintf(9, " * Converting default timezone to UTC.\n");
140 t = get_default_icaltimezone();
142 icaltimezone_convert_time(&TheTime, t, icaltimezone_get_utc_timezone());
146 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
148 lprintf(9, " * Now: %s\n", icaltime_as_ical_string(TheTime));
151 /* Now add the converted property back in. */
152 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
153 icalproperty_set_dtstart(prop, TheTime);
155 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
156 icalproperty_set_dtend(prop, TheTime);
158 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
159 icalproperty_set_due(prop, TheTime);
161 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
162 icalproperty_set_exdate(prop, TheTime);
168 * Recursive portion of ical_dezonify()
170 void ical_dezonify_recurse(icalcomponent *cal, icalcomponent *rcal) {
175 * Recurse through all subcomponents *except* VTIMEZONE ones.
177 for (c=icalcomponent_get_first_component(
178 rcal, ICAL_ANY_COMPONENT);
180 c = icalcomponent_get_next_component(
181 rcal, ICAL_ANY_COMPONENT)
183 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
184 ical_dezonify_recurse(cal, c);
189 * Now look for DTSTART and DTEND properties
191 for (p=icalcomponent_get_first_property(rcal, ICAL_ANY_PROPERTY);
193 p = icalcomponent_get_next_property(rcal, ICAL_ANY_PROPERTY)
196 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
197 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
198 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
199 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
201 ical_dezonify_backend(cal, rcal, p);
208 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
209 * This function will search any VTIMEZONE subcomponents to learn the
210 * relevant timezone information.
212 void ical_dezonify(icalcomponent *cal) {
213 icalcomponent *vt = NULL;
216 lprintf(9, "ical_dezonify() started\n");
219 /* Convert all times to UTC */
220 ical_dezonify_recurse(cal, cal);
222 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
223 while (vt = icalcomponent_get_first_component(
224 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
225 icalcomponent_remove_component(cal, vt);
226 icalcomponent_free(vt);
230 lprintf(9, "ical_dezonify() completed\n");