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/*
* Function to go through an ical component set and convert all non-UTC
* date/time properties to UTC. It also strips out any VTIMEZONE
* subcomponents afterwards, because they're irrelevant.
*
* Everything here will work on both a fully encapsulated VCALENDAR component
* or any type of subcomponent.
*/
#include "webcit.h"
#include "webserver.h"
/*
* Figure out which time zone needs to be used for timestamps that are
* not UTC and do not have a time zone specified.
*
*/
icaltimezone *get_default_icaltimezone(void) {
icaltimezone *zone = NULL;
const char *default_zone_name = ChrPtr(WC->serv_info->serv_default_cal_zone);
if (!zone) {
zone = icaltimezone_get_builtin_timezone(default_zone_name);
}
if (!zone) {
syslog(LOG_WARNING, "Unable to load '%s' time zone. Defaulting to UTC.\n", default_zone_name);
zone = icaltimezone_get_utc_timezone();
}
if (!zone) {
syslog(LOG_EMERG, "Unable to load UTC time zone!\n");
}
return zone;
}
/*
* Back end function for ical_dezonify()
*
* We supply this with the master component, the relevant component,
* and the property (which will be a DTSTART, DTEND, etc.)
* which we want to convert to UTC.
*/
void ical_dezonify_backend(icalcomponent *cal,
icalcomponent *rcal,
icalproperty *prop) {
icaltimezone *t = NULL;
icalparameter *param;
const char *tzid = NULL;
struct icaltimetype TheTime;
int utc_declared_as_tzid = 0; /* Component declared 'TZID=GMT' instead of using Z syntax */
/* Give me nothing and I will give you nothing in return. */
if (cal == NULL) return;
/* Hunt for a TZID parameter in this property. */
param = icalproperty_get_first_parameter(prop, ICAL_TZID_PARAMETER);
/* Get the stringish name of this TZID. */
if (param != NULL) {
tzid = icalparameter_get_tzid(param);
/* Convert it to an icaltimezone type. */
if (tzid != NULL) {
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * Stringy supplied timezone is: '%s'\n", tzid);
#endif
if ( (!strcasecmp(tzid, "UTC")) || (!strcasecmp(tzid, "GMT")) ) {
utc_declared_as_tzid = 1;
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * ...and we handle that internally.\n");
#endif
}
else {
/* try attached first */
t = icalcomponent_get_timezone(cal, tzid);
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * ...and I %s have tzdata for that zone.\n",
(t ? "DO" : "DO NOT")
);
#endif
/* then try built-in timezones */
if (!t) {
t = icaltimezone_get_builtin_timezone(tzid);
#ifdef DBG_ICAL
if (t) {
syslog(LOG_DEBUG, " * Using system tzdata!\n");
}
#endif
}
}
}
}
/* Now we know the timezone. Convert to UTC. */
if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
TheTime = icalproperty_get_dtstart(prop);
}
else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
TheTime = icalproperty_get_dtend(prop);
}
else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
TheTime = icalproperty_get_due(prop);
}
else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
TheTime = icalproperty_get_exdate(prop);
}
else {
return;
}
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * Was: %s\n", icaltime_as_ical_string(TheTime));
#endif
if (TheTime.is_utc) {
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * This property is ALREADY UTC.\n");
#endif
}
else if (utc_declared_as_tzid) {
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * Replacing '%s' TZID with 'Z' suffix.\n", tzid);
#endif
TheTime.is_utc = 1;
}
else {
/* Do the conversion. */
if (t != NULL) {
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * Timezone prop found. Converting to UTC.\n");
#endif
}
else {
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * Converting default timezone to UTC.\n");
#endif
}
if (t == NULL) {
t = get_default_icaltimezone();
}
icaltimezone_convert_time(&TheTime, t, icaltimezone_get_utc_timezone());
TheTime.is_utc = 1;
}
icalproperty_remove_parameter_by_kind(prop, ICAL_TZID_PARAMETER);
#ifdef DBG_ICAL
syslog(LOG_DEBUG, " * Now: %s\n", icaltime_as_ical_string(TheTime));
#endif
/* Now add the converted property back in. */
if (icalproperty_isa(prop) == ICAL_DTSTART_PROPERTY) {
icalproperty_set_dtstart(prop, TheTime);
}
else if (icalproperty_isa(prop) == ICAL_DTEND_PROPERTY) {
icalproperty_set_dtend(prop, TheTime);
}
else if (icalproperty_isa(prop) == ICAL_DUE_PROPERTY) {
icalproperty_set_due(prop, TheTime);
}
else if (icalproperty_isa(prop) == ICAL_EXDATE_PROPERTY) {
icalproperty_set_exdate(prop, TheTime);
}
}
/*
* Recursive portion of ical_dezonify()
*/
void ical_dezonify_recurse(icalcomponent *cal, icalcomponent *rcal) {
icalcomponent *c;
icalproperty *p;
/*
* Recurse through all subcomponents *except* VTIMEZONE ones.
*/
for (c=icalcomponent_get_first_component(
rcal, ICAL_ANY_COMPONENT);
c != NULL;
c = icalcomponent_get_next_component(
rcal, ICAL_ANY_COMPONENT)
) {
if (icalcomponent_isa(c) != ICAL_VTIMEZONE_COMPONENT) {
ical_dezonify_recurse(cal, c);
}
}
/*
* Now look for DTSTART and DTEND properties
*/
for (p=icalcomponent_get_first_property(rcal, ICAL_ANY_PROPERTY);
p != NULL;
p = icalcomponent_get_next_property(rcal, ICAL_ANY_PROPERTY)
) {
if (
(icalproperty_isa(p) == ICAL_DTSTART_PROPERTY)
|| (icalproperty_isa(p) == ICAL_DTEND_PROPERTY)
|| (icalproperty_isa(p) == ICAL_DUE_PROPERTY)
|| (icalproperty_isa(p) == ICAL_EXDATE_PROPERTY)
) {
ical_dezonify_backend(cal, rcal, p);
}
}
}
/*
* Convert all DTSTART and DTEND properties in all subcomponents to UTC.
* This function will search any VTIMEZONE subcomponents to learn the
* relevant timezone information.
*/
void ical_dezonify(icalcomponent *cal) {
icalcomponent *vt = NULL;
#ifdef DBG_ICAL
syslog(LOG_DEBUG, "ical_dezonify() started\n");
#endif
/* Convert all times to UTC */
ical_dezonify_recurse(cal, cal);
/* Strip out VTIMEZONE subcomponents -- we don't need them anymore */
while (vt = icalcomponent_get_first_component(
cal, ICAL_VTIMEZONE_COMPONENT), vt != NULL) {
icalcomponent_remove_component(cal, vt);
icalcomponent_free(vt);
}
#ifdef DBG_ICAL
syslog(LOG_DEBUG, "ical_dezonify() completed\n");
#endif
}
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