Wed Jan 27 20:02:13 2016

Asterisk developer's documentation


res_calendar_caldav.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 2008 - 2009, Digium, Inc.
00005  *
00006  * Terry Wilson <twilson@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  * \brief Resource for handling CalDAV calendars
00021  */
00022 
00023 /*** MODULEINFO
00024    <depend>neon</depend>
00025    <depend>ical</depend>
00026    <depend>libxml2</depend>
00027    <support_level>core</support_level>
00028 ***/
00029 
00030 #include "asterisk.h"
00031 
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 413586 $")
00033 
00034 #include <libical/ical.h>
00035 #include <ne_session.h>
00036 #include <ne_uri.h>
00037 #include <ne_request.h>
00038 #include <ne_auth.h>
00039 #include <ne_redirect.h>
00040 #include <libxml/xmlmemory.h>
00041 #include <libxml/parser.h>
00042 
00043 #include "asterisk/module.h"
00044 #include "asterisk/calendar.h"
00045 #include "asterisk/lock.h"
00046 #include "asterisk/config.h"
00047 #include "asterisk/astobj2.h"
00048 
00049 static void *caldav_load_calendar(void *data);
00050 static void *unref_caldav(void *obj);
00051 static int caldav_write_event(struct ast_calendar_event *event);
00052 
00053 static struct ast_calendar_tech caldav_tech = {
00054    .type = "caldav",
00055    .description = "CalDAV calendars",
00056    .module = AST_MODULE,
00057    .load_calendar = caldav_load_calendar,
00058    .unref_calendar = unref_caldav,
00059    .write_event = caldav_write_event,
00060 };
00061 
00062 struct caldav_pvt {
00063    AST_DECLARE_STRING_FIELDS(
00064       AST_STRING_FIELD(url);
00065       AST_STRING_FIELD(user);
00066       AST_STRING_FIELD(secret);
00067    );
00068    struct ast_calendar *owner;
00069    ne_uri uri;
00070    ne_session *session;
00071    struct ao2_container *events;
00072 };
00073 
00074 static void caldav_destructor(void *obj)
00075 {
00076    struct caldav_pvt *pvt = obj;
00077 
00078    ast_debug(1, "Destroying pvt for CalDAV calendar %s\n", pvt->owner->name);
00079    if (pvt->session) {
00080       ne_session_destroy(pvt->session);
00081    }
00082    ast_string_field_free_memory(pvt);
00083 
00084    ao2_callback(pvt->events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL);
00085 
00086    ao2_ref(pvt->events, -1);
00087 }
00088 
00089 static void *unref_caldav(void *obj)
00090 {
00091    struct caldav_pvt *pvt = obj;
00092 
00093    ao2_ref(pvt, -1);
00094    return NULL;
00095 }
00096 
00097 static int fetch_response_reader(void *data, const char *block, size_t len)
00098 {
00099    struct ast_str **response = data;
00100    unsigned char *tmp;
00101 
00102    if (!(tmp = ast_malloc(len + 1))) {
00103       return -1;
00104    }
00105    memcpy(tmp, block, len);
00106    tmp[len] = '\0';
00107    ast_str_append(response, 0, "%s", tmp);
00108    ast_free(tmp);
00109 
00110    return 0;
00111 }
00112 
00113 static int auth_credentials(void *userdata, const char *realm, int attempts, char *username, char *secret)
00114 {
00115    struct caldav_pvt *pvt = userdata;
00116 
00117    if (attempts > 1) {
00118       ast_log(LOG_WARNING, "Invalid username or password for CalDAV calendar '%s'\n", pvt->owner->name);
00119       return -1;
00120    }
00121 
00122    ne_strnzcpy(username, pvt->user, NE_ABUFSIZ);
00123    ne_strnzcpy(secret, pvt->secret, NE_ABUFSIZ);
00124 
00125    return 0;
00126 }
00127 
00128 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)
00129 {
00130    struct ast_str *response;
00131    ne_request *req;
00132    int ret;
00133    char buf[1000];
00134 
00135    if (!pvt) {
00136       ast_log(LOG_ERROR, "There is no private!\n");
00137       return NULL;
00138    }
00139 
00140    if (!(response = ast_str_create(512))) {
00141       ast_log(LOG_ERROR, "Could not allocate memory for response.\n");
00142       return NULL;
00143    }
00144 
00145    snprintf(buf, sizeof(buf), "%s%s", pvt->uri.path, subdir ? ast_str_buffer(subdir) : "");
00146 
00147    req = ne_request_create(pvt->session, method, buf);
00148    ne_add_response_body_reader(req, ne_accept_2xx, fetch_response_reader, &response);
00149    ne_set_request_body_buffer(req, ast_str_buffer(req_body), ast_str_strlen(req_body));
00150    ne_add_request_header(req, "Content-type", ast_strlen_zero(content_type) ? "text/xml" : content_type);
00151 
00152    ret = ne_request_dispatch(req);
00153    ne_request_destroy(req);
00154 
00155    if (ret != NE_OK || !ast_str_strlen(response)) {
00156       if (ret != NE_OK) {
00157          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));
00158       }
00159       ast_free(response);
00160       return NULL;
00161    }
00162 
00163    return response;
00164 }
00165 
00166 static int caldav_write_event(struct ast_calendar_event *event)
00167 {
00168    struct caldav_pvt *pvt;
00169    struct ast_str *body = NULL, *response = NULL, *subdir = NULL;
00170    icalcomponent *calendar, *icalevent;
00171    icaltimezone *utc = icaltimezone_get_utc_timezone();
00172    int ret = -1;
00173 
00174    if (!event) {
00175       ast_log(LOG_WARNING, "No event passed!\n");
00176       return -1;
00177    }
00178 
00179    if (!(event->start && event->end)) {
00180       ast_log(LOG_WARNING, "The event must contain a start and an end\n");
00181       return -1;
00182    }
00183    if (!(body = ast_str_create(512)) ||
00184       !(subdir = ast_str_create(32))) {
00185       ast_log(LOG_ERROR, "Could not allocate memory for request!\n");
00186       goto write_cleanup;
00187    }
00188 
00189    pvt = event->owner->tech_pvt;
00190 
00191    if (ast_strlen_zero(event->uid)) {
00192       unsigned short val[8];
00193       int x;
00194       for (x = 0; x < 8; x++) {
00195          val[x] = ast_random();
00196       }
00197       ast_string_field_build(event, uid, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
00198          (unsigned)val[0], (unsigned)val[1], (unsigned)val[2],
00199          (unsigned)val[3], (unsigned)val[4], (unsigned)val[5],
00200          (unsigned)val[6], (unsigned)val[7]);
00201    }
00202 
00203    calendar = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
00204    icalcomponent_add_property(calendar, icalproperty_new_version("2.0"));
00205    icalcomponent_add_property(calendar, icalproperty_new_prodid("-//Digium, Inc.//res_caldav//EN"));
00206 
00207    icalevent = icalcomponent_new(ICAL_VEVENT_COMPONENT);
00208    icalcomponent_add_property(icalevent, icalproperty_new_dtstamp(icaltime_current_time_with_zone(utc)));
00209    icalcomponent_add_property(icalevent, icalproperty_new_uid(event->uid));
00210    icalcomponent_add_property(icalevent, icalproperty_new_dtstart(icaltime_from_timet_with_zone(event->start, 0, utc)));
00211    icalcomponent_add_property(icalevent, icalproperty_new_dtend(icaltime_from_timet_with_zone(event->end, 0, utc)));
00212    if (!ast_strlen_zero(event->organizer)) {
00213       icalcomponent_add_property(icalevent, icalproperty_new_organizer(event->organizer));
00214    }
00215    if (!ast_strlen_zero(event->summary)) {
00216       icalcomponent_add_property(icalevent, icalproperty_new_summary(event->summary));
00217    }
00218    if (!ast_strlen_zero(event->description)) {
00219       icalcomponent_add_property(icalevent, icalproperty_new_description(event->description));
00220    }
00221    if (!ast_strlen_zero(event->location)) {
00222       icalcomponent_add_property(icalevent, icalproperty_new_location(event->location));
00223    }
00224    if (!ast_strlen_zero(event->categories)) {
00225       icalcomponent_add_property(icalevent, icalproperty_new_categories(event->categories));
00226    }
00227    if (event->priority > 0) {
00228       icalcomponent_add_property(icalevent, icalproperty_new_priority(event->priority));
00229    }
00230 
00231    switch (event->busy_state) {
00232    case AST_CALENDAR_BS_BUSY:
00233       icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_CONFIRMED));
00234       break;
00235 
00236    case AST_CALENDAR_BS_BUSY_TENTATIVE:
00237       icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_TENTATIVE));
00238       break;
00239 
00240    default:
00241       icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_NONE));
00242    }
00243 
00244    icalcomponent_add_component(calendar, icalevent);
00245 
00246    ast_str_append(&body, 0, "%s", icalcomponent_as_ical_string(calendar));
00247    ast_str_set(&subdir, 0, "%s%s.ics", pvt->url[strlen(pvt->url) - 1] == '/' ? "" : "/", event->uid);
00248 
00249    response = caldav_request(pvt, "PUT", body, subdir, "text/calendar");
00250 
00251    ret = 0;
00252 
00253 write_cleanup:
00254    if (body) {
00255       ast_free(body);
00256    }
00257    if (response) {
00258       ast_free(response);
00259    }
00260    if (subdir) {
00261       ast_free(subdir);
00262    }
00263 
00264    return ret;
00265 }
00266 
00267 static struct ast_str *caldav_get_events_between(struct caldav_pvt *pvt, time_t start_time, time_t end_time)
00268 {
00269    struct ast_str *body, *response;
00270    icaltimezone *utc = icaltimezone_get_utc_timezone();
00271    icaltimetype start, end;
00272    const char *start_str, *end_str;
00273 
00274    if (!(body = ast_str_create(512))) {
00275       ast_log(LOG_ERROR, "Could not allocate memory for body of request!\n");
00276       return NULL;
00277    }
00278 
00279    start = icaltime_from_timet_with_zone(start_time, 0, utc);
00280    end = icaltime_from_timet_with_zone(end_time, 0, utc);
00281    start_str = icaltime_as_ical_string(start);
00282    end_str = icaltime_as_ical_string(end);
00283 
00284    /* If I was really being efficient, I would store a collection of event URIs and etags,
00285     * first doing a query of just the etag and seeing if anything had changed.  If it had,
00286     * then I would do a request for each of the events that had changed, and only bother
00287     * updating those.  Oh well. */
00288    ast_str_append(&body, 0,
00289       "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n"
00290       "<C:calendar-query xmlns:D=\"DAV:\" xmlns:C=\"urn:ietf:params:xml:ns:caldav\">\n"
00291       "  <D:prop>\n"
00292       "    <C:calendar-data>\n"
00293       "      <C:expand start=\"%s\" end=\"%s\"/>\n"
00294       "    </C:calendar-data>\n"
00295       "  </D:prop>\n"
00296       "  <C:filter>\n"
00297       "    <C:comp-filter name=\"VCALENDAR\">\n"
00298       "      <C:comp-filter name=\"VEVENT\">\n"
00299       "        <C:time-range start=\"%s\" end=\"%s\"/>\n"
00300       "      </C:comp-filter>\n"
00301       "    </C:comp-filter>\n"
00302       "  </C:filter>\n"
00303       "</C:calendar-query>\n", start_str, end_str, start_str, end_str);
00304 
00305    response = caldav_request(pvt, "REPORT", body, NULL, NULL);
00306    ast_free(body);
00307 
00308    return response;
00309 }
00310 
00311 static time_t icalfloat_to_timet(icaltimetype time) 
00312 {
00313    struct ast_tm tm = {0,};
00314    struct timeval tv;
00315 
00316    tm.tm_mday = time.day;
00317    tm.tm_mon = time.month - 1;
00318    tm.tm_year = time.year - 1900;
00319    tm.tm_hour = time.hour;
00320    tm.tm_min = time.minute;
00321    tm.tm_sec = time.second;
00322    tm.tm_isdst = -1;
00323    tv = ast_mktime(&tm, NULL);
00324 
00325    return tv.tv_sec;
00326 }
00327 
00328 /* span->start & span->end may be dates or floating times which have no timezone,
00329  * which would mean that they should apply to the local timezone for all recepients.
00330  * For example, if a meeting was set for 1PM-2PM floating time, people in different time
00331  * zones would not be scheduled at the same local times.  Dates are often treated as
00332  * floating times, so all day events will need to be converted--so we can trust the
00333  * span here, and instead will grab the start and end from the component, which will
00334  * allow us to test for floating times or dates.
00335  */
00336 static void caldav_add_event(icalcomponent *comp, struct icaltime_span *span, void *data)
00337 {
00338    struct caldav_pvt *pvt = data;
00339    struct ast_calendar_event *event;
00340    icaltimezone *utc = icaltimezone_get_utc_timezone();
00341    icaltimetype start, end, tmp;
00342    icalcomponent *valarm;
00343    icalproperty *prop;
00344    struct icaltriggertype trigger;
00345 
00346    if (!(pvt && pvt->owner)) {
00347       ast_log(LOG_ERROR, "Require a private structure with an owner\n");
00348       return;
00349    }
00350 
00351    if (!(event = ast_calendar_event_alloc(pvt->owner))) {
00352       ast_log(LOG_ERROR, "Could not allocate an event!\n");
00353       return;
00354    }
00355 
00356    start = icalcomponent_get_dtstart(comp);
00357    end = icalcomponent_get_dtend(comp);
00358 
00359    event->start = icaltime_get_tzid(start) ? span->start : icalfloat_to_timet(start);
00360    event->end = icaltime_get_tzid(end) ? span->end : icalfloat_to_timet(end);
00361    event->busy_state = span->is_busy ? AST_CALENDAR_BS_BUSY : AST_CALENDAR_BS_FREE;
00362 
00363    if ((prop = icalcomponent_get_first_property(comp, ICAL_SUMMARY_PROPERTY))) {
00364       ast_string_field_set(event, summary, icalproperty_get_value_as_string(prop));
00365    }
00366 
00367    if ((prop = icalcomponent_get_first_property(comp, ICAL_DESCRIPTION_PROPERTY))) {
00368       ast_string_field_set(event, description, icalproperty_get_value_as_string(prop));
00369    }
00370 
00371    if ((prop = icalcomponent_get_first_property(comp, ICAL_ORGANIZER_PROPERTY))) {
00372       ast_string_field_set(event, organizer, icalproperty_get_value_as_string(prop));
00373    }
00374 
00375    if ((prop = icalcomponent_get_first_property(comp, ICAL_LOCATION_PROPERTY))) {
00376       ast_string_field_set(event, location, icalproperty_get_value_as_string(prop));
00377    }
00378 
00379    if ((prop = icalcomponent_get_first_property(comp, ICAL_CATEGORIES_PROPERTY))) {
00380       ast_string_field_set(event, categories, icalproperty_get_value_as_string(prop));
00381    }
00382 
00383    if ((prop = icalcomponent_get_first_property(comp, ICAL_PRIORITY_PROPERTY))) {
00384       event->priority = icalvalue_get_integer(icalproperty_get_value(prop));
00385    }
00386 
00387    if ((prop = icalcomponent_get_first_property(comp, ICAL_UID_PROPERTY))) {
00388       ast_string_field_set(event, uid, icalproperty_get_value_as_string(prop));
00389    } else {
00390       ast_log(LOG_WARNING, "No UID found, but one is required. Generating, but updates may not be acurate\n");
00391       if (!ast_strlen_zero(event->summary)) {
00392          ast_string_field_set(event, uid, event->summary);
00393       } else {
00394          char tmp[100];
00395          snprintf(tmp, sizeof(tmp), "%ld", event->start);
00396          ast_string_field_set(event, uid, tmp);
00397       }
00398    }
00399 
00400    /* Get the attendees */
00401    for (prop = icalcomponent_get_first_property(comp, ICAL_ATTENDEE_PROPERTY);
00402          prop; prop = icalcomponent_get_next_property(comp, ICAL_ATTENDEE_PROPERTY)) {
00403       struct ast_calendar_attendee *attendee;
00404       const char *data;
00405 
00406       if (!(attendee = ast_calloc(1, sizeof(*attendee)))) {
00407          event = ast_calendar_unref_event(event);
00408          return;
00409       }
00410       data = icalproperty_get_attendee(prop);
00411       if (ast_strlen_zero(data)) {
00412          ast_free(attendee);
00413          continue;
00414       }
00415       attendee->data = ast_strdup(data);
00416       AST_LIST_INSERT_TAIL(&event->attendees, attendee, next);
00417    }
00418 
00419 
00420    /* Only set values for alarm based on VALARM.  Can be overriden in main/calendar.c by autoreminder
00421     * therefore, go ahead and add events even if their is no VALARM or it is malformed
00422     * Currently we are only getting the first VALARM and are handling repitition in main/calendar.c from calendar.conf */
00423    if (!(valarm = icalcomponent_get_first_component(comp, ICAL_VALARM_COMPONENT))) {
00424       ao2_link(pvt->events, event);
00425       event = ast_calendar_unref_event(event);
00426       return;
00427    }
00428 
00429    if (!(prop = icalcomponent_get_first_property(valarm, ICAL_TRIGGER_PROPERTY))) {
00430       ast_log(LOG_WARNING, "VALARM has no TRIGGER, skipping!\n");
00431       ao2_link(pvt->events, event);
00432       event = ast_calendar_unref_event(event);
00433       return;
00434    }
00435 
00436    trigger = icalproperty_get_trigger(prop);
00437 
00438    if (icaltriggertype_is_null_trigger(trigger)) {
00439       ast_log(LOG_WARNING, "Bad TRIGGER for VALARM, skipping!\n");
00440       ao2_link(pvt->events, event);
00441       event = ast_calendar_unref_event(event);
00442       return;
00443    }
00444 
00445    if (!icaltime_is_null_time(trigger.time)) { /* This is an absolute time */
00446       tmp = icaltime_convert_to_zone(trigger.time, utc);
00447       event->alarm = icaltime_as_timet_with_zone(tmp, utc);
00448    } else { /* Offset from either dtstart or dtend */
00449       /* XXX Technically you can check RELATED to see if the event fires from the END of the event
00450        * But, I'm not sure I've ever seen anyone implement it in calendaring software, so I'm ignoring for now */
00451       tmp = icaltime_add(start, trigger.duration);
00452       event->alarm = icaltime_as_timet_with_zone(tmp, utc);
00453    }
00454 
00455    ao2_link(pvt->events, event);
00456    event = ast_calendar_unref_event(event);
00457 
00458    return;
00459 }
00460 
00461 struct xmlstate {
00462    int in_caldata;
00463    struct caldav_pvt *pvt;
00464    struct ast_str *cdata;
00465    time_t start;
00466    time_t end;
00467 };
00468 
00469 static void handle_start_element(void *data, const xmlChar *fullname, const xmlChar **atts)
00470 {
00471    struct xmlstate *state = data;
00472 
00473    if (!xmlStrcasecmp(fullname, BAD_CAST "C:calendar-data")) {
00474       state->in_caldata = 1;
00475       ast_str_reset(state->cdata);
00476    }
00477 }
00478 
00479 static void handle_end_element(void *data, const xmlChar *name)
00480 {
00481    struct xmlstate *state = data;
00482    struct icaltimetype start, end;
00483    icaltimezone *utc = icaltimezone_get_utc_timezone();
00484    icalcomponent *iter;
00485    icalcomponent *comp;
00486 
00487    if (xmlStrcasecmp(name, BAD_CAST "C:calendar-data")) {
00488       return;
00489    }
00490 
00491    state->in_caldata = 0;
00492    if (!(state->cdata && ast_str_strlen(state->cdata))) {
00493       return;
00494    }
00495    /* XXX Parse the calendar blurb for recurrence events in the time range,
00496     * create an event, and add it to pvt->events */
00497    start = icaltime_from_timet_with_zone(state->start, 0, utc);
00498    end = icaltime_from_timet_with_zone(state->end, 0, utc);
00499    comp = icalparser_parse_string(ast_str_buffer(state->cdata));
00500 
00501    for (iter = icalcomponent_get_first_component(comp, ICAL_VEVENT_COMPONENT);
00502         iter;
00503         iter = icalcomponent_get_next_component(comp, ICAL_VEVENT_COMPONENT))
00504    {
00505       icalcomponent_foreach_recurrence(iter, start, end, caldav_add_event, state->pvt);
00506    }
00507 
00508    icalcomponent_free(comp);
00509 }
00510 
00511 static void handle_characters(void *data, const xmlChar *ch, int len)
00512 {
00513    struct xmlstate *state = data;
00514    xmlChar *tmp;
00515 
00516    if (!state->in_caldata) {
00517       return;
00518    }
00519 
00520    tmp = xmlStrndup(ch, len);
00521    ast_str_append(&state->cdata, 0, "%s", (char *)tmp);
00522    xmlFree(tmp);
00523 }
00524 
00525 static int update_caldav(struct caldav_pvt *pvt)
00526 {
00527    struct timeval now = ast_tvnow();
00528    time_t start, end;
00529    struct ast_str *response;
00530    xmlSAXHandler saxHandler;
00531    struct xmlstate state = {
00532       .in_caldata = 0,
00533       .pvt = pvt
00534    };
00535 
00536    start = now.tv_sec;
00537    end = now.tv_sec + 60 * pvt->owner->timeframe;
00538    if (!(response = caldav_get_events_between(pvt, start, end))) {
00539       return -1;
00540    }
00541 
00542    if (!(state.cdata = ast_str_create(512))) {
00543       ast_free(response);
00544       return -1;
00545    }
00546 
00547    state.start = start;
00548    state.end = end;
00549 
00550    memset(&saxHandler, 0, sizeof(saxHandler));
00551    saxHandler.startElement = handle_start_element;
00552    saxHandler.endElement = handle_end_element;
00553    saxHandler.characters = handle_characters;
00554 
00555    xmlSAXUserParseMemory(&saxHandler, &state, ast_str_buffer(response), ast_str_strlen(response));
00556 
00557    ast_calendar_merge_events(pvt->owner, pvt->events);
00558 
00559    ast_free(response);
00560    ast_free(state.cdata);
00561 
00562    return 0;
00563 }
00564 
00565 static int verify_cert(void *userdata, int failures, const ne_ssl_certificate *cert)
00566 {
00567    /* Verify all certs */
00568    return 0;
00569 }
00570 
00571 static void *caldav_load_calendar(void *void_data)
00572 {
00573    struct caldav_pvt *pvt;
00574    const struct ast_config *cfg;
00575    struct ast_variable *v;
00576    struct ast_calendar *cal = void_data;
00577    ast_mutex_t refreshlock;
00578 
00579    if (!(cal && (cfg = ast_calendar_config_acquire()))) {
00580       ast_log(LOG_ERROR, "You must enable calendar support for res_caldav to load\n");
00581       return NULL;
00582    }
00583 
00584    if (ao2_trylock(cal)) {
00585       if (cal->unloading) {
00586          ast_log(LOG_WARNING, "Unloading module, load_calendar cancelled.\n");
00587       } else {
00588          ast_log(LOG_WARNING, "Could not lock calendar, aborting!\n");
00589       }
00590       ast_calendar_config_release();
00591       return NULL;
00592    }
00593 
00594    if (!(pvt = ao2_alloc(sizeof(*pvt), caldav_destructor))) {
00595       ast_log(LOG_ERROR, "Could not allocate caldav_pvt structure for calendar: %s\n", cal->name);
00596       ast_calendar_config_release();
00597       return NULL;
00598    }
00599 
00600    pvt->owner = cal;
00601 
00602    if (!(pvt->events = ast_calendar_event_container_alloc())) {
00603       ast_log(LOG_ERROR, "Could not allocate space for fetching events for calendar: %s\n", cal->name);
00604       pvt = unref_caldav(pvt);
00605       ao2_unlock(cal);
00606       ast_calendar_config_release();
00607       return NULL;
00608    }
00609 
00610    if (ast_string_field_init(pvt, 32)) {
00611       ast_log(LOG_ERROR, "Couldn't allocate string field space for calendar: %s\n", cal->name);
00612       pvt = unref_caldav(pvt);
00613       ao2_unlock(cal);
00614       ast_calendar_config_release();
00615       return NULL;
00616    }
00617 
00618    for (v = ast_variable_browse(cfg, cal->name); v; v = v->next) {
00619       if (!strcasecmp(v->name, "url")) {
00620          ast_string_field_set(pvt, url, v->value);
00621       } else if (!strcasecmp(v->name, "user")) {
00622          ast_string_field_set(pvt, user, v->value);
00623       } else if (!strcasecmp(v->name, "secret")) {
00624          ast_string_field_set(pvt, secret, v->value);
00625       }
00626    }
00627 
00628    ast_calendar_config_release();
00629 
00630    if (ast_strlen_zero(pvt->url)) {
00631       ast_log(LOG_WARNING, "No URL was specified for CalDAV calendar '%s' - skipping.\n", cal->name);
00632       pvt = unref_caldav(pvt);
00633       ao2_unlock(cal);
00634       return NULL;
00635    }
00636 
00637    if (ne_uri_parse(pvt->url, &pvt->uri) || pvt->uri.host == NULL || pvt->uri.path == NULL) {
00638       ast_log(LOG_WARNING, "Could not parse url '%s' for CalDAV calendar '%s' - skipping.\n", pvt->url, cal->name);
00639       pvt = unref_caldav(pvt);
00640       ao2_unlock(cal);
00641       return NULL;
00642    }
00643 
00644    if (pvt->uri.scheme == NULL) {
00645       pvt->uri.scheme = "http";
00646    }
00647 
00648    if (pvt->uri.port == 0) {
00649       pvt->uri.port = ne_uri_defaultport(pvt->uri.scheme);
00650    }
00651 
00652    pvt->session = ne_session_create(pvt->uri.scheme, pvt->uri.host, pvt->uri.port);
00653    ne_redirect_register(pvt->session);
00654    ne_set_server_auth(pvt->session, auth_credentials, pvt);
00655    if (!strcasecmp(pvt->uri.scheme, "https")) {
00656       ne_ssl_trust_default_ca(pvt->session);
00657       ne_ssl_set_verify(pvt->session, verify_cert, NULL);
00658    }
00659 
00660    cal->tech_pvt = pvt;
00661 
00662    ast_mutex_init(&refreshlock);
00663 
00664    /* Load it the first time */
00665    update_caldav(pvt);
00666 
00667    ao2_unlock(cal);
00668 
00669    /* The only writing from another thread will be if unload is true */
00670    for (;;) {
00671       struct timeval tv = ast_tvnow();
00672       struct timespec ts = {0,};
00673 
00674       ts.tv_sec = tv.tv_sec + (60 * pvt->owner->refresh);
00675 
00676       ast_mutex_lock(&refreshlock);
00677       while (!pvt->owner->unloading) {
00678          if (ast_cond_timedwait(&pvt->owner->unload, &refreshlock, &ts) == ETIMEDOUT) {
00679             break;
00680          }
00681       }
00682       ast_mutex_unlock(&refreshlock);
00683 
00684       if (pvt->owner->unloading) {
00685          ast_debug(10, "Skipping refresh since we got a shutdown signal\n");
00686          return NULL;
00687       }
00688 
00689       ast_debug(10, "Refreshing after %d minute timeout\n", pvt->owner->refresh);
00690 
00691       update_caldav(pvt);
00692    }
00693 
00694    return NULL;
00695 }
00696 
00697 static int load_module(void)
00698 {
00699    ne_sock_init();
00700    if (ast_calendar_register(&caldav_tech)) {
00701       ne_sock_exit();
00702       return AST_MODULE_LOAD_DECLINE;
00703    }
00704 
00705    return AST_MODULE_LOAD_SUCCESS;
00706 }
00707 
00708 static int unload_module(void)
00709 {
00710    ast_calendar_unregister(&caldav_tech);
00711    ne_sock_exit();
00712    return 0;
00713 }
00714 
00715 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Asterisk CalDAV Calendar Integration",
00716       .load = load_module,
00717       .unload = unload_module,
00718       .load_pri = AST_MODPRI_DEVSTATE_PLUGIN,
00719    );

Generated on 27 Jan 2016 for Asterisk - The Open Source Telephony Project by  doxygen 1.6.1