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webcit  8.12-dfsg
Functions
availability.c File Reference
#include "webcit.h"
#include "webserver.h"
#include "calendar.h"

Go to the source code of this file.

Functions

icalcomponent * get_freebusy_for_user (char *who)
int ical_ctdl_is_overlap (struct icaltimetype t1start, struct icaltimetype t1end, struct icaltimetype t2start, struct icaltimetype t2end)
void check_individual_attendee (char *attendee_string, struct icaltimetype event_start, struct icaltimetype event_end, char *annotation)
void check_attendee_availability (icalcomponent *vevent)

Function Documentation

void check_attendee_availability ( icalcomponent *  vevent)

< Convert everything to UTC

screen name or email address

Replace the attendee name with an annotated one.

Definition at line 197 of file availability.c.

                                                        {
       icalproperty *attendee = NULL;
       icalproperty *dtstart_p = NULL;
       icalproperty *dtend_p = NULL;
       struct icaltimetype dtstart_t;
       struct icaltimetype dtend_t;
       char attendee_string[SIZ];
       char annotated_attendee_string[SIZ];
       char annotation[SIZ];
       const char *ch;

       if (vevent == NULL) {
              return;
       }

       /*
        * If we're looking at a fully encapsulated VCALENDAR
        * rather than a VEVENT component, attempt to use the first
        * relevant VEVENT subcomponent.  If there is none, the
        * NULL returned by icalcomponent_get_first_component() will
        * tell the next iteration of this function to create a
        * new one.
        */
       if (icalcomponent_isa(vevent) == ICAL_VCALENDAR_COMPONENT) {
              check_attendee_availability(
                     icalcomponent_get_first_component(
                            vevent, ICAL_VEVENT_COMPONENT
                     )
              );
              return;
       }

       ical_dezonify(vevent);             
       /*
        * Learn the start and end times.
        */
       dtstart_p = icalcomponent_get_first_property(vevent, ICAL_DTSTART_PROPERTY);
       if (dtstart_p != NULL) dtstart_t = icalproperty_get_dtstart(dtstart_p);

       dtend_p = icalcomponent_get_first_property(vevent, ICAL_DTEND_PROPERTY);
       if (dtend_p != NULL) dtend_t = icalproperty_get_dtend(dtend_p);

       /*
        * Iterate through attendees.
        */
       for (attendee = icalcomponent_get_first_property(vevent, ICAL_ATTENDEE_PROPERTY);
           attendee != NULL;
           attendee = icalcomponent_get_next_property(vevent, ICAL_ATTENDEE_PROPERTY)) {
              ch = icalproperty_get_attendee(attendee);
              if ((ch != NULL) && !strncasecmp(ch, "MAILTO:", 7)) {

                     safestrncpy(attendee_string, ch + 7, sizeof(attendee_string));
                     striplt(attendee_string);

                     check_individual_attendee(attendee_string,
                                          dtstart_t, dtend_t,
                                          annotation);

                     snprintf(annotated_attendee_string, sizeof annotated_attendee_string,
                            "MAILTO:%s (%s)", attendee_string, annotation);
                     icalproperty_set_attendee(attendee, annotated_attendee_string);

              }
       }

}

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void check_individual_attendee ( char *  attendee_string,
struct icaltimetype  event_start,
struct icaltimetype  event_end,
char *  annotation 
)

Do the check

Definition at line 134 of file availability.c.

                                              {

       icalcomponent *fbc = NULL;
       icalcomponent *fb = NULL;
       icalproperty *thisfb = NULL;
       struct icalperiodtype period;

       /*
        * Set to 'unknown' right from the beginning.  Unless we learn
        * something else, that's what we'll go with.
        */
       strcpy(annotation, _("availability unknown"));

       fbc = get_freebusy_for_user(attendee_string);
       if (fbc == NULL) {
              return;
       }

       /*
        * Make sure we're looking at a VFREEBUSY by itself.  What we're probably
        * looking at initially is a VFREEBUSY encapsulated in a VCALENDAR.
        */
       if (icalcomponent_isa(fbc) == ICAL_VCALENDAR_COMPONENT) {
              fb = icalcomponent_get_first_component(fbc, ICAL_VFREEBUSY_COMPONENT);
       }
       else if (icalcomponent_isa(fbc) == ICAL_VFREEBUSY_COMPONENT) {
              fb = fbc;
       }

       /* Iterate through all FREEBUSY's looking for conflicts. */
       if (fb != NULL) {

              strcpy(annotation, _("free"));

              for (thisfb = icalcomponent_get_first_property(fb, ICAL_FREEBUSY_PROPERTY);
                  thisfb != NULL;
                  thisfb = icalcomponent_get_next_property(fb, ICAL_FREEBUSY_PROPERTY) ) {

                     period = icalproperty_get_freebusy(thisfb);
                     if (ical_ctdl_is_overlap(period.start, period.end,
                        event_start, event_end)) {
                            strcpy(annotation, _("BUSY"));
                     }

              }
       }

       icalcomponent_free(fbc);
}

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icalcomponent* get_freebusy_for_user ( char *  who)

Definition at line 21 of file availability.c.

                                                {
       long nLines;
       char buf[SIZ];
       StrBuf *serialized_fb = NewStrBuf();
       icalcomponent *fb = NULL;

       serv_printf("ICAL freebusy|%s", who);
       serv_getln(buf, sizeof buf);
       if (buf[0] == '1') {
              read_server_text(serialized_fb, &nLines);
       }

       if (serialized_fb == NULL) {
              return NULL;
       }
       
       fb = icalcomponent_new_from_string(ChrPtr(serialized_fb));
       FreeStrBuf(&serialized_fb);
       if (fb == NULL) {
              return NULL;
       }

       return(fb);
}

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int ical_ctdl_is_overlap ( struct icaltimetype  t1start,
struct icaltimetype  t1end,
struct icaltimetype  t2start,
struct icaltimetype  t2end 
)

Definition at line 55 of file availability.c.

  {

       if (icaltime_is_null_time(t1start)) return(0);
       if (icaltime_is_null_time(t2start)) return(0);

       /* if either event lacks end time, assume end = start */
       if (icaltime_is_null_time(t1end))
              memcpy(&t1end, &t1start, sizeof(struct icaltimetype));
       else {
              if (t1end.is_date && icaltime_compare(t1start, t1end)) {
                        /*
                         * the end date is non-inclusive so adjust it by one
                         * day because our test is inclusive, note that a day is
                         * not too much because we are talking about all day
                         * events
                      * if start = end we assume that nevertheless the whole
                      * day is meant
                         */
                     icaltime_adjust(&t1end, -1, 0, 0, 0);     
              }
       }

       if (icaltime_is_null_time(t2end))
              memcpy(&t2end, &t2start, sizeof(struct icaltimetype));
       else {
              if (t2end.is_date && icaltime_compare(t2start, t2end)) {
                     icaltime_adjust(&t2end, -1, 0, 0, 0);     
              }
       }

       /* First, check for all-day events */
       if (t1start.is_date || t2start.is_date) {
              /* If event 1 ends before event 2 starts, we're in the clear. */
              if (icaltime_compare_date_only(t1end, t2start) < 0) return(0);

              /* If event 2 ends before event 1 starts, we're also ok. */
              if (icaltime_compare_date_only(t2end, t1start) < 0) return(0);

              return(1);
       }

       /* syslog(9, "Comparing t1start %d:%d t1end %d:%d t2start %d:%d t2end %d:%d \n",
              t1start.hour, t1start.minute, t1end.hour, t1end.minute,
              t2start.hour, t2start.minute, t2end.hour, t2end.minute);
       */

       /* Now check for overlaps using date *and* time. */

       /* If event 1 ends before event 2 starts, we're in the clear. */
       if (icaltime_compare(t1end, t2start) <= 0) return(0);
       /* syslog(9, "first passed\n"); */

       /* If event 2 ends before event 1 starts, we're also ok. */
       if (icaltime_compare(t2end, t1start) <= 0) return(0);
       /* syslog(9, "second passed\n"); */

       /* Otherwise, they overlap. */
       return(1);
}

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