6 * \defgroup CalendarAv Check attendee availability for scheduling a meeting.
13 #include "webserver.h"
15 /** only available if we have calendaring */
16 #ifdef WEBCIT_WITH_CALENDAR_SERVICE
21 * \brief verify users avaiability
22 * Utility function to fetch a VFREEBUSY type of thing for
24 * \param who string of the user to search
26 icalcomponent *get_freebusy_for_user(char *who) {
28 char *serialized_fb = NULL;
29 icalcomponent *fb = NULL;
31 serv_printf("ICAL freebusy|%s", who);
32 serv_getln(buf, sizeof buf);
34 serialized_fb = read_server_text();
37 if (serialized_fb == NULL) {
41 fb = icalcomponent_new_from_string(serialized_fb);
51 /* TODO: temporary copy from libical, apply this patch to libical... */
52 int webcit_icaltime_compare(const struct icaltimetype a_in, const struct icaltimetype b_in)
54 struct icaltimetype a, b;
56 a = icaltime_convert_to_zone(a_in, icaltimezone_get_utc_timezone());
57 b = icaltime_convert_to_zone(b_in, icaltimezone_get_utc_timezone());
61 else if (a.year < b.year)
64 else if (a.month > b.month)
66 else if (a.month < b.month)
69 else if (a.day > b.day)
71 else if (a.day < b.day)
74 /* if both are dates, we are done */
75 if (a.is_date && b.is_date)
78 /* else, if only one is a date (and we already know the date part is equal),
79 then the other is greater */
85 else if (a.hour > b.hour)
87 else if (a.hour < b.hour)
90 else if (a.minute > b.minute)
92 else if (a.minute < b.minute)
95 else if (a.second > b.second)
97 else if (a.second < b.second)
105 * \brief Check if dates are overlapping
106 * Check to see if two events overlap.
107 * (This function is used in both Citadel and WebCit. If you change it in
108 * one place, change it in the other. Better yet, put it in a library.)
109 * \param t1start date one start
110 * \param t1end date one end
111 * \param t2start date one start
112 * \param t2end date two end
113 * \returns nonzero if they do.
115 int ical_ctdl_is_overlap(
116 struct icaltimetype t1start,
117 struct icaltimetype t1end,
118 struct icaltimetype t2start,
119 struct icaltimetype t2end
122 if (icaltime_is_null_time(t1start)) return(0);
123 if (icaltime_is_null_time(t2start)) return(0);
125 /** First, check for all-day events */
126 if (t1start.is_date) {
127 if (!icaltime_compare_date_only(t1start, t2start)) {
130 if (!icaltime_is_null_time(t2end)) {
131 if (!icaltime_compare_date_only(t1start, t2end)) {
137 if (t2start.is_date) {
138 if (!icaltime_compare_date_only(t2start, t1start)) {
141 if (!icaltime_is_null_time(t1end)) {
142 if (!icaltime_compare_date_only(t2start, t1end)) {
148 /* lprintf (9, "Comparing t1start %d:%d t1end %d:%d t2start %d:%d t2end %d:%d \n",
149 t1start.hour, t1start.minute, t1end.hour, t1end.minute,
150 t2start.hour, t2start.minute, t2end.hour, t2end.minute);
153 /** Now check for overlaps using date *and* time. */
155 /** First, bail out if either event 1 or event 2 is missing end time. */
156 if (icaltime_is_null_time(t1end)) return(0);
157 if (icaltime_is_null_time(t2end)) return(0);
159 /** If event 1 ends before event 2 starts, we're in the clear. */
160 if (webcit_icaltime_compare(t1end, t2start) <= 0) return(0);
161 // lprintf(9, "first passed\n");
163 /** If event 2 ends before event 1 starts, we're also ok. */
164 if (webcit_icaltime_compare(t2end, t1start) <= 0) return(0);
165 // lprintf(9, "second passed\n");
167 /** Otherwise, they overlap. */
174 * \brief dig availability on citserver
175 * Back end function for check_attendee_availability()
176 * This one checks an individual attendee against a supplied
177 * event start and end time. All these fields have already been
179 * \param attendee_string name of the attendee
180 * \param event_start starttime of the event to check
181 * \param event_end endtime of the event to check
182 * \return The result is placed in 'annotation'.
184 void check_individual_attendee(char *attendee_string,
185 struct icaltimetype event_start,
186 struct icaltimetype event_end,
189 icalcomponent *fbc = NULL;
190 icalcomponent *fb = NULL;
191 icalproperty *thisfb = NULL;
192 struct icalperiodtype period;
195 * Set to 'unknown' right from the beginning. Unless we learn
196 * something else, that's what we'll go with.
198 strcpy(annotation, _("availability unknown"));
200 fbc = get_freebusy_for_user(attendee_string);
206 * Make sure we're looking at a VFREEBUSY by itself. What we're probably
207 * looking at initially is a VFREEBUSY encapsulated in a VCALENDAR.
209 if (icalcomponent_isa(fbc) == ICAL_VCALENDAR_COMPONENT) {
210 fb = icalcomponent_get_first_component(fbc, ICAL_VFREEBUSY_COMPONENT);
212 else if (icalcomponent_isa(fbc) == ICAL_VFREEBUSY_COMPONENT) {
216 /** Iterate through all FREEBUSY's looking for conflicts. */
219 strcpy(annotation, _("free"));
221 for (thisfb = icalcomponent_get_first_property(fb, ICAL_FREEBUSY_PROPERTY);
223 thisfb = icalcomponent_get_next_property(fb, ICAL_FREEBUSY_PROPERTY) ) {
226 period = icalproperty_get_freebusy(thisfb);
227 if (ical_ctdl_is_overlap(period.start, period.end,
228 event_start, event_end)) {
229 strcpy(annotation, _("BUSY"));
235 icalcomponent_free(fbc);
242 * \brief check attendees availability
243 * Check the availability of all attendees for an event (when possible)
244 * and annotate accordingly.
245 * \param vevent the event which should be compared with attendees calendar
247 void check_attendee_availability(icalcomponent *vevent) {
248 icalproperty *attendee = NULL;
249 icalproperty *dtstart_p = NULL;
250 icalproperty *dtend_p = NULL;
251 struct icaltimetype dtstart_t;
252 struct icaltimetype dtend_t;
253 char attendee_string[SIZ];
254 char annotated_attendee_string[SIZ];
255 char annotation[SIZ];
257 if (vevent == NULL) {
262 * If we're looking at a fully encapsulated VCALENDAR
263 * rather than a VEVENT component, attempt to use the first
264 * relevant VEVENT subcomponent. If there is none, the
265 * NULL returned by icalcomponent_get_first_component() will
266 * tell the next iteration of this function to create a
269 if (icalcomponent_isa(vevent) == ICAL_VCALENDAR_COMPONENT) {
270 check_attendee_availability(
271 icalcomponent_get_first_component(
272 vevent, ICAL_VEVENT_COMPONENT
278 ical_dezonify(vevent); /**< Convert everything to UTC */
281 * Learn the start and end times.
283 dtstart_p = icalcomponent_get_first_property(vevent, ICAL_DTSTART_PROPERTY);
284 if (dtstart_p != NULL) dtstart_t = icalproperty_get_dtstart(dtstart_p);
286 dtend_p = icalcomponent_get_first_property(vevent, ICAL_DTEND_PROPERTY);
287 if (dtend_p != NULL) dtend_t = icalproperty_get_dtend(dtend_p);
290 * Iterate through attendees.
292 for (attendee = icalcomponent_get_first_property(vevent, ICAL_ATTENDEE_PROPERTY);
294 attendee = icalcomponent_get_next_property(vevent, ICAL_ATTENDEE_PROPERTY)) {
296 strcpy(attendee_string, icalproperty_get_attendee(attendee));
297 if (!strncasecmp(attendee_string, "MAILTO:", 7)) {
299 /** screen name or email address */
300 strcpy(attendee_string, &attendee_string[7]);
301 striplt(attendee_string);
303 check_individual_attendee(attendee_string,
307 /** Replace the attendee name with an annotated one. */
308 snprintf(annotated_attendee_string, sizeof annotated_attendee_string,
309 "MAILTO:%s (%s)", attendee_string, annotation);
310 icalproperty_set_attendee(attendee, annotated_attendee_string);
318 #endif /* WEBCIT_WITH_CALENDAR_SERVICE */