Add aresult variable for CALENDAR_WRITE
[asterisk/asterisk.git] / res / res_calendar_caldav.c
1 /*
2  * Asterisk -- An open source telephony toolkit.
3  *
4  * Copyright (C) 2008 - 2009, Digium, Inc.
5  *
6  * Terry Wilson <twilson@digium.com>
7  *
8  * See http://www.asterisk.org for more information about
9  * the Asterisk project. Please do not directly contact
10  * any of the maintainers of this project for assistance;
11  * the project provides a web site, mailing lists and IRC
12  * channels for your use.
13  *
14  * This program is free software, distributed under the terms of
15  * the GNU General Public License Version 2. See the LICENSE file
16  * at the top of the source tree.
17  */
18
19 /*! \file
20  * \brief Resource for handling CalDAV calendars
21  */
22
23 /*** MODULEINFO
24         <depend>neon</depend>
25         <depend>ical</depend>
26         <depend>libxml2</depend>
27         <support_level>core</support_level>
28 ***/
29
30 #include "asterisk.h"
31
32 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
33
34 #include <libical/ical.h>
35 #include <ne_session.h>
36 #include <ne_uri.h>
37 #include <ne_request.h>
38 #include <ne_auth.h>
39 #include <ne_redirect.h>
40 #include <libxml/xmlmemory.h>
41 #include <libxml/parser.h>
42
43 #include "asterisk/module.h"
44 #include "asterisk/calendar.h"
45 #include "asterisk/lock.h"
46 #include "asterisk/config.h"
47 #include "asterisk/astobj2.h"
48
49 static void *caldav_load_calendar(void *data);
50 static void *unref_caldav(void *obj);
51 static int caldav_write_event(struct ast_calendar_event *event);
52
53 static struct ast_calendar_tech caldav_tech = {
54         .type = "caldav",
55         .description = "CalDAV calendars",
56         .module = AST_MODULE,
57         .load_calendar = caldav_load_calendar,
58         .unref_calendar = unref_caldav,
59         .write_event = caldav_write_event,
60 };
61
62 struct caldav_pvt {
63         AST_DECLARE_STRING_FIELDS(
64                 AST_STRING_FIELD(url);
65                 AST_STRING_FIELD(user);
66                 AST_STRING_FIELD(secret);
67         );
68         struct ast_calendar *owner;
69         ne_uri uri;
70         ne_session *session;
71         struct ao2_container *events;
72 };
73
74 static void caldav_destructor(void *obj)
75 {
76         struct caldav_pvt *pvt = obj;
77
78         ast_debug(1, "Destroying pvt for CalDAV calendar %s\n", pvt->owner->name);
79         if (pvt->session) {
80                 ne_session_destroy(pvt->session);
81         }
82         ast_string_field_free_memory(pvt);
83
84         ao2_callback(pvt->events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL);
85
86         ao2_ref(pvt->events, -1);
87 }
88
89 static void *unref_caldav(void *obj)
90 {
91         struct caldav_pvt *pvt = obj;
92
93         ao2_ref(pvt, -1);
94         return NULL;
95 }
96
97 static int fetch_response_reader(void *data, const char *block, size_t len)
98 {
99         struct ast_str **response = data;
100         unsigned char *tmp;
101
102         if (!(tmp = ast_malloc(len + 1))) {
103                 return -1;
104         }
105         memcpy(tmp, block, len);
106         tmp[len] = '\0';
107         ast_str_append(response, 0, "%s", tmp);
108         ast_free(tmp);
109
110         return 0;
111 }
112
113 static int auth_credentials(void *userdata, const char *realm, int attempts, char *username, char *secret)
114 {
115         struct caldav_pvt *pvt = userdata;
116
117         if (attempts > 1) {
118                 ast_log(LOG_WARNING, "Invalid username or password for CalDAV calendar '%s'\n", pvt->owner->name);
119                 return -1;
120         }
121
122         ne_strnzcpy(username, pvt->user, NE_ABUFSIZ);
123         ne_strnzcpy(secret, pvt->secret, NE_ABUFSIZ);
124
125         return 0;
126 }
127
128 static int debug_response_handler(void *userdata, ne_request *req, const ne_status *st)
129 {
130         if (st->code < 200 || st->code > 299) {
131                 ast_debug(1, "Unexpected response from server, %d: %s\n", st->code, st->reason_phrase);
132                 return 0;
133         }
134         return 1;
135 }
136
137 static struct ast_str *caldav_request(struct caldav_pvt *pvt, const char *method, struct ast_str *req_body, struct ast_str *subdir, const char *content_type)
138 {
139         struct ast_str *response;
140         ne_request *req;
141         int ret;
142         char buf[1000];
143
144         if (!pvt) {
145                 ast_log(LOG_ERROR, "There is no private!\n");
146                 return NULL;
147         }
148
149         if (!(response = ast_str_create(512))) {
150                 ast_log(LOG_ERROR, "Could not allocate memory for response.\n");
151                 return NULL;
152         }
153
154         snprintf(buf, sizeof(buf), "%s%s", pvt->uri.path, subdir ? ast_str_buffer(subdir) : "");
155
156         req = ne_request_create(pvt->session, method, buf);
157         ne_add_response_body_reader(req, debug_response_handler, fetch_response_reader, &response);
158         ne_set_request_body_buffer(req, ast_str_buffer(req_body), ast_str_strlen(req_body));
159         ne_add_request_header(req, "Content-type", ast_strlen_zero(content_type) ? "text/xml" : content_type);
160
161         ret = ne_request_dispatch(req);
162         ne_request_destroy(req);
163
164         if (ret != NE_OK) {
165                 ast_log(LOG_WARNING, "Unknown response to CalDAV calendar %s, request %s to %s: %s\n", pvt->owner->name, method, buf, ne_get_error(pvt->session));
166                 ast_free(response);
167                 return NULL;
168         }
169
170         return response;
171 }
172
173 static int caldav_write_event(struct ast_calendar_event *event)
174 {
175         struct caldav_pvt *pvt;
176         struct ast_str *body = NULL, *response = NULL, *subdir = NULL;
177         icalcomponent *calendar, *icalevent;
178         icaltimezone *utc = icaltimezone_get_utc_timezone();
179         int ret = -1;
180
181         if (!event) {
182                 ast_log(LOG_WARNING, "No event passed!\n");
183                 return -1;
184         }
185
186         if (!(event->start && event->end)) {
187                 ast_log(LOG_WARNING, "The event must contain a start and an end\n");
188                 return -1;
189         }
190         if (!(body = ast_str_create(512)) ||
191                 !(subdir = ast_str_create(32)) ||
192                 !(response = ast_str_create(512))) {
193                 ast_log(LOG_ERROR, "Could not allocate memory for request and response!\n");
194                 goto write_cleanup;
195         }
196
197         pvt = event->owner->tech_pvt;
198
199         if (ast_strlen_zero(event->uid)) {
200                 unsigned short val[8];
201                 int x;
202                 for (x = 0; x < 8; x++) {
203                         val[x] = ast_random();
204                 }
205                 ast_string_field_build(event, uid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x", val[0], val[1], val[2], val[3], val[4], val[5], val[6], val[7]);
206         }
207
208         calendar = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
209         icalcomponent_add_property(calendar, icalproperty_new_version("2.0"));
210         icalcomponent_add_property(calendar, icalproperty_new_prodid("-//Digium, Inc.//res_caldav//EN"));
211
212         icalevent = icalcomponent_new(ICAL_VEVENT_COMPONENT);
213         icalcomponent_add_property(icalevent, icalproperty_new_dtstamp(icaltime_current_time_with_zone(utc)));
214         icalcomponent_add_property(icalevent, icalproperty_new_uid(event->uid));
215         icalcomponent_add_property(icalevent, icalproperty_new_dtstart(icaltime_from_timet_with_zone(event->start, 0, utc)));
216         icalcomponent_add_property(icalevent, icalproperty_new_dtend(icaltime_from_timet_with_zone(event->end, 0, utc)));
217         if (!ast_strlen_zero(event->organizer)) {
218                 icalcomponent_add_property(icalevent, icalproperty_new_organizer(event->organizer));
219         }
220         if (!ast_strlen_zero(event->summary)) {
221                 icalcomponent_add_property(icalevent, icalproperty_new_summary(event->summary));
222         }
223         if (!ast_strlen_zero(event->description)) {
224                 icalcomponent_add_property(icalevent, icalproperty_new_description(event->description));
225         }
226         if (!ast_strlen_zero(event->location)) {
227                 icalcomponent_add_property(icalevent, icalproperty_new_location(event->location));
228         }
229         if (!ast_strlen_zero(event->categories)) {
230                 icalcomponent_add_property(icalevent, icalproperty_new_categories(event->categories));
231         }
232         if (event->priority > 0) {
233                 icalcomponent_add_property(icalevent, icalproperty_new_priority(event->priority));
234         }
235
236         switch (event->busy_state) {
237         case AST_CALENDAR_BS_BUSY:
238                 icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_CONFIRMED));
239                 break;
240
241         case AST_CALENDAR_BS_BUSY_TENTATIVE:
242                 icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_TENTATIVE));
243                 break;
244
245         default:
246                 icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_NONE));
247         }
248
249         icalcomponent_add_component(calendar, icalevent);
250
251         ast_str_append(&body, 0, "%s", icalcomponent_as_ical_string(calendar));
252         ast_str_set(&subdir, 0, "%s%s.ics", pvt->url[strlen(pvt->url) - 1] == '/' ? "" : "/", event->uid);
253
254         if ((response = caldav_request(pvt, "PUT", body, subdir, "text/calendar"))) {
255                 ret = 0;
256         }
257
258 write_cleanup:
259         if (body) {
260                 ast_free(body);
261         }
262         if (response) {
263                 ast_free(response);
264         }
265         if (subdir) {
266                 ast_free(subdir);
267         }
268
269         return ret;
270 }
271
272 static struct ast_str *caldav_get_events_between(struct caldav_pvt *pvt, time_t start_time, time_t end_time)
273 {
274         struct ast_str *body, *response;
275         icaltimezone *utc = icaltimezone_get_utc_timezone();
276         icaltimetype start, end;
277         const char *start_str, *end_str;
278
279         if (!(body = ast_str_create(512))) {
280                 ast_log(LOG_ERROR, "Could not allocate memory for body of request!\n");
281                 return NULL;
282         }
283
284         start = icaltime_from_timet_with_zone(start_time, 0, utc);
285         end = icaltime_from_timet_with_zone(end_time, 0, utc);
286         start_str = icaltime_as_ical_string(start);
287         end_str = icaltime_as_ical_string(end);
288
289         /* If I was really being efficient, I would store a collection of event URIs and etags,
290          * first doing a query of just the etag and seeing if anything had changed.  If it had,
291          * then I would do a request for each of the events that had changed, and only bother
292          * updating those.  Oh well. */
293         ast_str_append(&body, 0,
294                 "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n"
295                 "<C:calendar-query xmlns:D=\"DAV:\" xmlns:C=\"urn:ietf:params:xml:ns:caldav\">\n"
296                 "  <D:prop>\n"
297                 "    <C:calendar-data>\n"
298                 "      <C:expand start=\"%s\" end=\"%s\"/>\n"
299                 "    </C:calendar-data>\n"
300                 "  </D:prop>\n"
301                 "  <C:filter>\n"
302                 "    <C:comp-filter name=\"VCALENDAR\">\n"
303                 "      <C:comp-filter name=\"VEVENT\">\n"
304                 "        <C:time-range start=\"%s\" end=\"%s\"/>\n"
305                 "      </C:comp-filter>\n"
306                 "    </C:comp-filter>\n"
307                 "  </C:filter>\n"
308                 "</C:calendar-query>\n", start_str, end_str, start_str, end_str);
309
310         response = caldav_request(pvt, "REPORT", body, NULL, NULL);
311         ast_free(body);
312         if (response && !ast_str_strlen(response)) {
313                 ast_free(response);
314                 return NULL;
315         }
316
317         return response;
318 }
319
320 static time_t icalfloat_to_timet(icaltimetype time) 
321 {
322         struct ast_tm tm = {0,};
323         struct timeval tv;
324
325         tm.tm_mday = time.day;
326         tm.tm_mon = time.month - 1;
327         tm.tm_year = time.year - 1900;
328         tm.tm_hour = time.hour;
329         tm.tm_min = time.minute;
330         tm.tm_sec = time.second;
331         tm.tm_isdst = -1;
332         tv = ast_mktime(&tm, NULL);
333
334         return tv.tv_sec;
335 }
336
337 /* span->start & span->end may be dates or floating times which have no timezone,
338  * which would mean that they should apply to the local timezone for all recepients.
339  * For example, if a meeting was set for 1PM-2PM floating time, people in different time
340  * zones would not be scheduled at the same local times.  Dates are often treated as
341  * floating times, so all day events will need to be converted--so we can trust the
342  * span here, and instead will grab the start and end from the component, which will
343  * allow us to test for floating times or dates.
344  */
345 static void caldav_add_event(icalcomponent *comp, struct icaltime_span *span, void *data)
346 {
347         struct caldav_pvt *pvt = data;
348         struct ast_calendar_event *event;
349         icaltimezone *utc = icaltimezone_get_utc_timezone();
350         icaltimetype start, end, tmp;
351         icalcomponent *valarm;
352         icalproperty *prop;
353         struct icaltriggertype trigger;
354
355         if (!(pvt && pvt->owner)) {
356                 ast_log(LOG_ERROR, "Require a private structure with an owner\n");
357                 return;
358         }
359
360         if (!(event = ast_calendar_event_alloc(pvt->owner))) {
361                 ast_log(LOG_ERROR, "Could not allocate an event!\n");
362                 return;
363         }
364
365         start = icalcomponent_get_dtstart(comp);
366         end = icalcomponent_get_dtend(comp);
367
368         event->start = icaltime_get_tzid(start) ? span->start : icalfloat_to_timet(start);
369         event->end = icaltime_get_tzid(end) ? span->end : icalfloat_to_timet(end);
370         event->busy_state = span->is_busy ? AST_CALENDAR_BS_BUSY : AST_CALENDAR_BS_FREE;
371
372         if ((prop = icalcomponent_get_first_property(comp, ICAL_SUMMARY_PROPERTY))) {
373                 ast_string_field_set(event, summary, icalproperty_get_value_as_string(prop));
374         }
375
376         if ((prop = icalcomponent_get_first_property(comp, ICAL_DESCRIPTION_PROPERTY))) {
377                 ast_string_field_set(event, description, icalproperty_get_value_as_string(prop));
378         }
379
380         if ((prop = icalcomponent_get_first_property(comp, ICAL_ORGANIZER_PROPERTY))) {
381                 ast_string_field_set(event, organizer, icalproperty_get_value_as_string(prop));
382         }
383
384         if ((prop = icalcomponent_get_first_property(comp, ICAL_LOCATION_PROPERTY))) {
385                 ast_string_field_set(event, location, icalproperty_get_value_as_string(prop));
386         }
387
388         if ((prop = icalcomponent_get_first_property(comp, ICAL_CATEGORIES_PROPERTY))) {
389                 ast_string_field_set(event, categories, icalproperty_get_value_as_string(prop));
390         }
391
392         if ((prop = icalcomponent_get_first_property(comp, ICAL_PRIORITY_PROPERTY))) {
393                 event->priority = icalvalue_get_integer(icalproperty_get_value(prop));
394         }
395
396         if ((prop = icalcomponent_get_first_property(comp, ICAL_UID_PROPERTY))) {
397                 ast_string_field_set(event, uid, icalproperty_get_value_as_string(prop));
398         } else {
399                 ast_log(LOG_WARNING, "No UID found, but one is required. Generating, but updates may not be acurate\n");
400                 if (!ast_strlen_zero(event->summary)) {
401                         ast_string_field_set(event, uid, event->summary);
402                 } else {
403                         char tmp[100];
404                         snprintf(tmp, sizeof(tmp), "%lu", event->start);
405                         ast_string_field_set(event, uid, tmp);
406                 }
407         }
408
409         /* Get the attendees */
410         for (prop = icalcomponent_get_first_property(comp, ICAL_ATTENDEE_PROPERTY);
411                         prop; prop = icalcomponent_get_next_property(comp, ICAL_ATTENDEE_PROPERTY)) {
412                 struct ast_calendar_attendee *attendee;
413                 const char *data;
414
415                 if (!(attendee = ast_calloc(1, sizeof(*attendee)))) {
416                         event = ast_calendar_unref_event(event);
417                         return;
418                 }
419                 data = icalproperty_get_attendee(prop);
420                 if (!ast_strlen_zero(data)) {
421                         attendee->data = ast_strdup(data);;
422                         AST_LIST_INSERT_TAIL(&event->attendees, attendee, next);
423                 }
424         }
425
426
427         /* Only set values for alarm based on VALARM.  Can be overriden in main/calendar.c by autoreminder
428          * therefore, go ahead and add events even if their is no VALARM or it is malformed
429          * Currently we are only getting the first VALARM and are handling repitition in main/calendar.c from calendar.conf */
430         if (!(valarm = icalcomponent_get_first_component(comp, ICAL_VALARM_COMPONENT))) {
431                 ao2_link(pvt->events, event);
432                 event = ast_calendar_unref_event(event);
433                 return;
434         }
435
436         if (!(prop = icalcomponent_get_first_property(valarm, ICAL_TRIGGER_PROPERTY))) {
437                 ast_log(LOG_WARNING, "VALARM has no TRIGGER, skipping!\n");
438                 ao2_link(pvt->events, event);
439                 event = ast_calendar_unref_event(event);
440                 return;
441         }
442
443         trigger = icalproperty_get_trigger(prop);
444
445         if (icaltriggertype_is_null_trigger(trigger)) {
446                 ast_log(LOG_WARNING, "Bad TRIGGER for VALARM, skipping!\n");
447                 ao2_link(pvt->events, event);
448                 event = ast_calendar_unref_event(event);
449                 return;
450         }
451
452         if (!icaltime_is_null_time(trigger.time)) { /* This is an absolute time */
453                 tmp = icaltime_convert_to_zone(trigger.time, utc);
454                 event->alarm = icaltime_as_timet_with_zone(tmp, utc);
455         } else { /* Offset from either dtstart or dtend */
456                 /* XXX Technically you can check RELATED to see if the event fires from the END of the event
457                  * But, I'm not sure I've ever seen anyone implement it in calendaring software, so I'm ignoring for now */
458                 tmp = icaltime_add(start, trigger.duration);
459                 event->alarm = icaltime_as_timet_with_zone(tmp, utc);
460         }
461
462         ao2_link(pvt->events, event);
463         event = ast_calendar_unref_event(event);
464
465         return;
466 }
467
468 struct xmlstate {
469         int in_caldata;
470         struct caldav_pvt *pvt;
471         struct ast_str *cdata;
472         time_t start;
473         time_t end;
474 };
475
476 static void handle_start_element(void *data, const xmlChar *fullname, const xmlChar **atts)
477 {
478         struct xmlstate *state = data;
479
480         if (!xmlStrcasecmp(fullname, BAD_CAST "C:calendar-data")) {
481                 state->in_caldata = 1;
482                 ast_str_reset(state->cdata);
483         }
484 }
485
486 static void handle_end_element(void *data, const xmlChar *name)
487 {
488         struct xmlstate *state = data;
489         struct icaltimetype start, end;
490         icaltimezone *utc = icaltimezone_get_utc_timezone();
491         icalcomponent *iter;
492         icalcomponent *comp;
493
494         if (xmlStrcasecmp(name, BAD_CAST "C:calendar-data")) {
495                 return;
496         }
497
498         state->in_caldata = 0;
499         if (!(state->cdata && ast_str_strlen(state->cdata))) {
500                 return;
501         }
502         /* XXX Parse the calendar blurb for recurrence events in the time range,
503          * create an event, and add it to pvt->events */
504         start = icaltime_from_timet_with_zone(state->start, 0, utc);
505         end = icaltime_from_timet_with_zone(state->end, 0, utc);
506         comp = icalparser_parse_string(ast_str_buffer(state->cdata));
507
508         for (iter = icalcomponent_get_first_component(comp, ICAL_VEVENT_COMPONENT);
509              iter;
510              iter = icalcomponent_get_next_component(comp, ICAL_VEVENT_COMPONENT))
511         {
512                 icalcomponent_foreach_recurrence(iter, start, end, caldav_add_event, state->pvt);
513         }
514
515         icalcomponent_free(comp);
516 }
517
518 static void handle_characters(void *data, const xmlChar *ch, int len)
519 {
520         struct xmlstate *state = data;
521         xmlChar *tmp;
522
523         if (!state->in_caldata) {
524                 return;
525         }
526
527         tmp = xmlStrndup(ch, len);
528         ast_str_append(&state->cdata, 0, "%s", (char *)tmp);
529         xmlFree(tmp);
530 }
531
532 static int update_caldav(struct caldav_pvt *pvt)
533 {
534         struct timeval now = ast_tvnow();
535         time_t start, end;
536         struct ast_str *response;
537         xmlSAXHandler saxHandler;
538         struct xmlstate state = {
539                 .in_caldata = 0,
540                 .pvt = pvt
541         };
542
543         start = now.tv_sec;
544         end = now.tv_sec + 60 * pvt->owner->timeframe;
545         if (!(response = caldav_get_events_between(pvt, start, end))) {
546                 return -1;
547         }
548
549         if (!(state.cdata = ast_str_create(512))) {
550                 ast_free(response);
551                 return -1;
552         }
553
554         state.start = start;
555         state.end = end;
556
557         memset(&saxHandler, 0, sizeof(saxHandler));
558         saxHandler.startElement = handle_start_element;
559         saxHandler.endElement = handle_end_element;
560         saxHandler.characters = handle_characters;
561
562         xmlSAXUserParseMemory(&saxHandler, &state, ast_str_buffer(response), ast_str_strlen(response));
563
564         ast_calendar_merge_events(pvt->owner, pvt->events);
565
566         ast_free(response);
567         ast_free(state.cdata);
568
569         return 0;
570 }
571
572 static int verify_cert(void *userdata, int failures, const ne_ssl_certificate *cert)
573 {
574         /* Verify all certs */
575         return 0;
576 }
577
578 static void *caldav_load_calendar(void *void_data)
579 {
580         struct caldav_pvt *pvt;
581         const struct ast_config *cfg;
582         struct ast_variable *v;
583         struct ast_calendar *cal = void_data;
584         ast_mutex_t refreshlock;
585
586         if (!(cal && (cfg = ast_calendar_config_acquire()))) {
587                 ast_log(LOG_ERROR, "You must enable calendar support for res_caldav to load\n");
588                 return NULL;
589         }
590
591         if (ao2_trylock(cal)) {
592                 if (cal->unloading) {
593                         ast_log(LOG_WARNING, "Unloading module, load_calendar cancelled.\n");
594                 } else {
595                         ast_log(LOG_WARNING, "Could not lock calendar, aborting!\n");
596                 }
597                 ast_calendar_config_release();
598                 return NULL;
599         }
600
601         if (!(pvt = ao2_alloc(sizeof(*pvt), caldav_destructor))) {
602                 ast_log(LOG_ERROR, "Could not allocate caldav_pvt structure for calendar: %s\n", cal->name);
603                 ast_calendar_config_release();
604                 return NULL;
605         }
606
607         pvt->owner = cal;
608
609         if (!(pvt->events = ast_calendar_event_container_alloc())) {
610                 ast_log(LOG_ERROR, "Could not allocate space for fetching events for calendar: %s\n", cal->name);
611                 pvt = unref_caldav(pvt);
612                 ao2_unlock(cal);
613                 ast_calendar_config_release();
614                 return NULL;
615         }
616
617         if (ast_string_field_init(pvt, 32)) {
618                 ast_log(LOG_ERROR, "Couldn't allocate string field space for calendar: %s\n", cal->name);
619                 pvt = unref_caldav(pvt);
620                 ao2_unlock(cal);
621                 ast_calendar_config_release();
622                 return NULL;
623         }
624
625         for (v = ast_variable_browse(cfg, cal->name); v; v = v->next) {
626                 if (!strcasecmp(v->name, "url")) {
627                         ast_string_field_set(pvt, url, v->value);
628                 } else if (!strcasecmp(v->name, "user")) {
629                         ast_string_field_set(pvt, user, v->value);
630                 } else if (!strcasecmp(v->name, "secret")) {
631                         ast_string_field_set(pvt, secret, v->value);
632                 }
633         }
634
635         ast_calendar_config_release();
636
637         if (ast_strlen_zero(pvt->url)) {
638                 ast_log(LOG_WARNING, "No URL was specified for CalDAV calendar '%s' - skipping.\n", cal->name);
639                 pvt = unref_caldav(pvt);
640                 ao2_unlock(cal);
641                 return NULL;
642         }
643
644         if (ne_uri_parse(pvt->url, &pvt->uri) || pvt->uri.host == NULL || pvt->uri.path == NULL) {
645                 ast_log(LOG_WARNING, "Could not parse url '%s' for CalDAV calendar '%s' - skipping.\n", pvt->url, cal->name);
646                 pvt = unref_caldav(pvt);
647                 ao2_unlock(cal);
648                 return NULL;
649         }
650
651         if (pvt->uri.scheme == NULL) {
652                 pvt->uri.scheme = "http";
653         }
654
655         if (pvt->uri.port == 0) {
656                 pvt->uri.port = ne_uri_defaultport(pvt->uri.scheme);
657         }
658
659         pvt->session = ne_session_create(pvt->uri.scheme, pvt->uri.host, pvt->uri.port);
660         ne_redirect_register(pvt->session);
661         ne_set_server_auth(pvt->session, auth_credentials, pvt);
662         if (!strcasecmp(pvt->uri.scheme, "https")) {
663                 ne_ssl_trust_default_ca(pvt->session);
664                 ne_ssl_set_verify(pvt->session, verify_cert, NULL);
665         }
666
667         cal->tech_pvt = pvt;
668
669         ast_mutex_init(&refreshlock);
670
671         /* Load it the first time */
672         update_caldav(pvt);
673
674         ao2_unlock(cal);
675
676         /* The only writing from another thread will be if unload is true */
677         for (;;) {
678                 struct timeval tv = ast_tvnow();
679                 struct timespec ts = {0,};
680
681                 ts.tv_sec = tv.tv_sec + (60 * pvt->owner->refresh);
682
683                 ast_mutex_lock(&refreshlock);
684                 while (!pvt->owner->unloading) {
685                         if (ast_cond_timedwait(&pvt->owner->unload, &refreshlock, &ts) == ETIMEDOUT) {
686                                 break;
687                         }
688                 }
689                 ast_mutex_unlock(&refreshlock);
690
691                 if (pvt->owner->unloading) {
692                         ast_debug(10, "Skipping refresh since we got a shutdown signal\n");
693                         return NULL;
694                 }
695
696                 ast_debug(10, "Refreshing after %d minute timeout\n", pvt->owner->refresh);
697
698                 update_caldav(pvt);
699         }
700
701         return NULL;
702 }
703
704 static int load_module(void)
705 {
706         ne_sock_init();
707         if (ast_calendar_register(&caldav_tech)) {
708                 ne_sock_exit();
709                 return AST_MODULE_LOAD_DECLINE;
710         }
711
712         return AST_MODULE_LOAD_SUCCESS;
713 }
714
715 static int unload_module(void)
716 {
717         ast_calendar_unregister(&caldav_tech);
718         ne_sock_exit();
719         return 0;
720 }
721
722 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Asterisk CalDAV Calendar Integration",
723                 .load = load_module,
724                 .unload = unload_module,
725                 .load_pri = AST_MODPRI_DEVSTATE_PLUGIN,
726         );