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>
22 #include "citserver.h"
23 #include "sysdep_decls.h"
26 #include "ical_dezonify.h"
30 * Figure out which time zone needs to be used for timestamps that are
31 * not UTC and do not have a time zone specified.
33 icaltimezone *get_default_icaltimezone(void) {
35 icaltimezone *zone = NULL;
36 char *default_zone_name = config.c_default_cal_zone;
37 //char *default_zone_name = "America/New_York";
40 zone = icaltimezone_get_builtin_timezone(default_zone_name);
43 CtdlLogPrintf(CTDL_ALERT,
44 "Unable to load '%s' time zone. Defaulting to UTC.\n",
46 zone = icaltimezone_get_utc_timezone();
49 CtdlLogPrintf(1, "Unable to load UTC time zone!\n");
56 * Back end function for ical_dezonify()
58 * We supply this with the master component, the relevant component,
59 * and the property (which will be a DTSTART, DTEND, etc.)
60 * which we want to convert to UTC.
62 void ical_dezonify_backend(icalcomponent *cal,
66 icaltimezone *t = NULL;
68 const char *tzid = NULL;
69 struct icaltimetype TheTime;
70 int utc_declared_as_tzid = 0; /**< Component declared 'TZID=GMT' instead of using Z syntax */
72 /* Give me nothing and I will give you nothing in return. */
73 if (cal == NULL) return;
75 /* Hunt for a TZID parameter in this property. */
76 param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
78 /* Get the stringish name of this TZID. */
80 tzid = icalparameter_get_tzid(param);
82 /* Convert it to an icaltimezone type. */
84 /* CtdlLogPrintf(9, " * Stringy supplied timezone is: '%s'\n", tzid); */
85 if ( (!strcasecmp(tzid, "UTC")) || (!strcasecmp(tzid, "GMT")) ) {
86 utc_declared_as_tzid = 1;
87 /* CtdlLogPrintf(9, " * ...and we handle that internally.\n"); */
90 t = icalcomponent_get_timezone(cal, tzid);
91 /* CtdlLogPrintf(9, " * ...and I %s have tzdata for that zone.\n",
99 /* Now we know the timezone. Convert to UTC. */
101 if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
102 TheTime = icalproperty_get_dtstart(prop);
104 else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
105 TheTime = icalproperty_get_dtend(prop);
107 else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
108 TheTime = icalproperty_get_due(prop);
110 else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
111 TheTime = icalproperty_get_exdate(prop);
117 /* CtdlLogPrintf(9, " * Was: %s\n", icaltime_as_ical_string(TheTime)); */
119 if (TheTime.is_utc) {
120 /* CtdlLogPrintf(9, " * This property is ALREADY UTC.\n"); */
123 else if (utc_declared_as_tzid) {
124 /* CtdlLogPrintf(9, " * Replacing '%s' TZID with 'Z' suffix.\n", tzid); */
129 /* Do the conversion. */
131 /* CtdlLogPrintf(9, " * Timezone prop found. Converting to UTC.\n"); */
134 /* CtdlLogPrintf(9, " * Converting default timezone to UTC.\n"); */
138 t = get_default_icaltimezone();
141 icaltimezone_convert_time(&TheTime,
143 icaltimezone_get_utc_timezone()
148 icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
149 /* CtdlLogPrintf(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;
215 /* CtdlLogPrintf(9, "ical_dezonify() started\n"); */
217 /* Convert all times to UTC */
218 ical_dezonify_recurse(cal, cal);
220 /* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
221 while (vt = icalcomponent_get_first_component(
222 cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
223 icalcomponent_remove_component(cal, vt);
224 icalcomponent_free(vt);
227 /* CtdlLogPrintf(9, "ical_dezonify() completed\n"); */