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"
20 * Figure out which time zone needs to be used for timestamps that are
21 * not UTC and do not have a time zone specified.
24 icaltimezone *get_default_icaltimezone(void) {
26 icaltimezone *zone = NULL;
27 char *default_zone_name = serv_info.serv_default_cal_zone;
30 zone = icaltimezone_get_builtin_timezone(default_zone_name);
33 lprintf(1, "Unable to load '%s' time zone. Defaulting to UTC.\n", default_zone_name);
34 zone = icaltimezone_get_utc_timezone();
37 lprintf(1, "Unable to load UTC time zone!\n");
44 * Back end function for ical_dezonify()
46 * We supply this with the master component, the relevant component,
47 * and the property (which will be a DTSTART, DTEND, etc.)
48 * which we want to convert to UTC.
50 void ical_dezonify_backend(icalcomponent *cal,
54 icaltimezone *t = NULL;
56 const char *tzid = NULL;
57 struct icaltimetype TheTime;
58 int utc_declared_as_tzid = 0; /* Component declared 'TZID=GMT' instead of using Z syntax */
60 /* Give me nothing and I will give you nothing in return. */
61 if (cal == NULL) return;
63 /* Hunt for a TZID parameter in this property. */
64 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
66 /* Get the stringish name of this TZID. */
68 tzid = icalparameter_get_tzid(param);
70 /* Convert it to an icaltimezone type. */
73 lprintf(9, " * Stringy supplied timezone is: '%s'\n", tzid);
75 if ( (!strcasecmp(tzid, "UTC")) || (!strcasecmp(tzid, "GMT")) ) {
76 utc_declared_as_tzid = 1;
78 lprintf(9, " * ...and we handle that internally.\n");
82 /* try attached first */
83 t = icalcomponent_get_timezone(cal, tzid);
85 lprintf(9, " * ...and I %s have tzdata for that zone.\n",
89 /* then try built-in timezones */
91 t = icaltimezone_get_builtin_timezone(tzid);
94 lprintf(9, " * Using system tzdata!\n");
103 /* Now we know the timezone. Convert to UTC. */
105 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
106 TheTime = icalproperty_get_dtstart(prop);
108 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
109 TheTime = icalproperty_get_dtend(prop);
111 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
112 TheTime = icalproperty_get_due(prop);
114 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
115 TheTime = icalproperty_get_exdate(prop);
122 lprintf(9, " * Was: %s\n", icaltime_as_ical_string(TheTime));
125 if (TheTime.is_utc) {
127 lprintf(9, " * This property is ALREADY UTC.\n");
131 else if (utc_declared_as_tzid) {
133 lprintf(9, " * Replacing '%s' TZID with 'Z' suffix.\n", tzid);
139 /* Do the conversion. */
142 lprintf(9, " * Timezone prop found. Converting to UTC.\n");
147 lprintf(9, " * Converting default timezone to UTC.\n");
152 t = get_default_icaltimezone();
154 icaltimezone_convert_time(&TheTime, t, icaltimezone_get_utc_timezone());
158 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
160 lprintf(9, " * Now: %s\n", icaltime_as_ical_string(TheTime));
163 /* Now add the converted property back in. */
164 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
165 icalproperty_set_dtstart(prop, TheTime);
167 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
168 icalproperty_set_dtend(prop, TheTime);
170 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
171 icalproperty_set_due(prop, TheTime);
173 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
174 icalproperty_set_exdate(prop, TheTime);
180 * Recursive portion of ical_dezonify()
182 void ical_dezonify_recurse(icalcomponent *cal, icalcomponent *rcal) {
187 * Recurse through all subcomponents *except* VTIMEZONE ones.
189 for (c=icalcomponent_get_first_component(
190 rcal, ICAL_ANY_COMPONENT);
192 c = icalcomponent_get_next_component(
193 rcal, ICAL_ANY_COMPONENT)
195 if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
196 ical_dezonify_recurse(cal, c);
201 * Now look for DTSTART and DTEND properties
203 for (p=icalcomponent_get_first_property(rcal, ICAL_ANY_PROPERTY);
205 p = icalcomponent_get_next_property(rcal, ICAL_ANY_PROPERTY)
208 (icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
209 || (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
210 || (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
211 || (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
213 ical_dezonify_backend(cal, rcal, p);
220 * Convert all DTSTART and DTEND properties in all subcomponents to UTC.
221 * This function will search any VTIMEZONE subcomponents to learn the
222 * relevant timezone information.
224 void ical_dezonify(icalcomponent *cal) {
225 icalcomponent *vt = NULL;
228 lprintf(9, "ical_dezonify() started\n");
231 /* Convert all times to UTC */
232 ical_dezonify_recurse(cal, cal);
234 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
235 while (vt = icalcomponent_get_first_component(
236 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
237 icalcomponent_remove_component(cal, vt);
238 icalcomponent_free(vt);
242 lprintf(9, "ical_dezonify() completed\n");