+++ /dev/null
-/*
- * 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_ERR, "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 (icaltime_is_utc(TheTime)) {
-#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.zone = icaltimezone_get_utc_timezone();
- }
-
- 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.zone = icaltimezone_get_utc_timezone();
- }
-
- 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
-}
-
projects / citadel.git / blobdiff