Thu Oct 11 06:33:52 2012

Asterisk developer's documentation


res_calendar_caldav.c

Go to the documentation of this file.
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: 366917 $")
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 int debug_response_handler(void *userdata, ne_request *req, const ne_status *st)
00129 {
00130    if (st->code < 200 || st->code > 299) {
00131       ast_debug(1, "Unexpected response from server, %d: %s\n", st->code, st->reason_phrase);
00132       return 0;
00133    }
00134    return 1;
00135 }
00136 
00137 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)
00138 {
00139    struct ast_str *response;
00140    ne_request *req;
00141    int ret;
00142    char buf[1000];
00143 
00144    if (!pvt) {
00145       ast_log(LOG_ERROR, "There is no private!\n");
00146       return NULL;
00147    }
00148 
00149    if (!(response = ast_str_create(512))) {
00150       ast_log(LOG_ERROR, "Could not allocate memory for response.\n");
00151       return NULL;
00152    }
00153 
00154    snprintf(buf, sizeof(buf), "%s%s", pvt->uri.path, subdir ? ast_str_buffer(subdir) : "");
00155 
00156    req = ne_request_create(pvt->session, method, buf);
00157    ne_add_response_body_reader(req, debug_response_handler, fetch_response_reader, &response);
00158    ne_set_request_body_buffer(req, ast_str_buffer(req_body), ast_str_strlen(req_body));
00159    ne_add_request_header(req, "Content-type", ast_strlen_zero(content_type) ? "text/xml" : content_type);
00160 
00161    ret = ne_request_dispatch(req);
00162    ne_request_destroy(req);
00163 
00164    if (ret != NE_OK) {
00165       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));
00166       ast_free(response);
00167       return NULL;
00168    }
00169 
00170    return response;
00171 }
00172 
00173 static int caldav_write_event(struct ast_calendar_event *event)
00174 {
00175    struct caldav_pvt *pvt;
00176    struct ast_str *body = NULL, *response = NULL, *subdir = NULL;
00177    icalcomponent *calendar, *icalevent;
00178    icaltimezone *utc = icaltimezone_get_utc_timezone();
00179    int ret = -1;
00180 
00181    if (!event) {
00182       ast_log(LOG_WARNING, "No event passed!\n");
00183       return -1;
00184    }
00185 
00186    if (!(event->start && event->end)) {
00187       ast_log(LOG_WARNING, "The event must contain a start and an end\n");
00188       return -1;
00189    }
00190    if (!(body = ast_str_create(512)) ||
00191       !(subdir = ast_str_create(32))) {
00192       ast_log(LOG_ERROR, "Could not allocate memory for request!\n");
00193       goto write_cleanup;
00194    }
00195 
00196    pvt = event->owner->tech_pvt;
00197 
00198    if (ast_strlen_zero(event->uid)) {
00199       unsigned short val[8];
00200       int x;
00201       for (x = 0; x < 8; x++) {
00202          val[x] = ast_random();
00203       }
00204       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]);
00205    }
00206 
00207    calendar = icalcomponent_new(ICAL_VCALENDAR_COMPONENT);
00208    icalcomponent_add_property(calendar, icalproperty_new_version("2.0"));
00209    icalcomponent_add_property(calendar, icalproperty_new_prodid("-//Digium, Inc.//res_caldav//EN"));
00210 
00211    icalevent = icalcomponent_new(ICAL_VEVENT_COMPONENT);
00212    icalcomponent_add_property(icalevent, icalproperty_new_dtstamp(icaltime_current_time_with_zone(utc)));
00213    icalcomponent_add_property(icalevent, icalproperty_new_uid(event->uid));
00214    icalcomponent_add_property(icalevent, icalproperty_new_dtstart(icaltime_from_timet_with_zone(event->start, 0, utc)));
00215    icalcomponent_add_property(icalevent, icalproperty_new_dtend(icaltime_from_timet_with_zone(event->end, 0, utc)));
00216    if (!ast_strlen_zero(event->organizer)) {
00217       icalcomponent_add_property(icalevent, icalproperty_new_organizer(event->organizer));
00218    }
00219    if (!ast_strlen_zero(event->summary)) {
00220       icalcomponent_add_property(icalevent, icalproperty_new_summary(event->summary));
00221    }
00222    if (!ast_strlen_zero(event->description)) {
00223       icalcomponent_add_property(icalevent, icalproperty_new_description(event->description));
00224    }
00225    if (!ast_strlen_zero(event->location)) {
00226       icalcomponent_add_property(icalevent, icalproperty_new_location(event->location));
00227    }
00228    if (!ast_strlen_zero(event->categories)) {
00229       icalcomponent_add_property(icalevent, icalproperty_new_categories(event->categories));
00230    }
00231    if (event->priority > 0) {
00232       icalcomponent_add_property(icalevent, icalproperty_new_priority(event->priority));
00233    }
00234 
00235    switch (event->busy_state) {
00236    case AST_CALENDAR_BS_BUSY:
00237       icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_CONFIRMED));
00238       break;
00239 
00240    case AST_CALENDAR_BS_BUSY_TENTATIVE:
00241       icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_TENTATIVE));
00242       break;
00243 
00244    default:
00245       icalcomponent_add_property(icalevent, icalproperty_new_status(ICAL_STATUS_NONE));
00246    }
00247 
00248    icalcomponent_add_component(calendar, icalevent);
00249 
00250    ast_str_append(&body, 0, "%s", icalcomponent_as_ical_string(calendar));
00251    ast_str_set(&subdir, 0, "%s%s.ics", pvt->url[strlen(pvt->url) - 1] == '/' ? "" : "/", event->uid);
00252 
00253    if ((response = caldav_request(pvt, "PUT", body, subdir, "text/calendar"))) {
00254       ret = 0;
00255    }
00256 
00257 write_cleanup:
00258    if (body) {
00259       ast_free(body);
00260    }
00261    if (response) {
00262       ast_free(response);
00263    }
00264    if (subdir) {
00265       ast_free(subdir);
00266    }
00267 
00268    return ret;
00269 }
00270 
00271 static struct ast_str *caldav_get_events_between(struct caldav_pvt *pvt, time_t start_time, time_t end_time)
00272 {
00273    struct ast_str *body, *response;
00274    icaltimezone *utc = icaltimezone_get_utc_timezone();
00275    icaltimetype start, end;
00276    const char *start_str, *end_str;
00277 
00278    if (!(body = ast_str_create(512))) {
00279       ast_log(LOG_ERROR, "Could not allocate memory for body of request!\n");
00280       return NULL;
00281    }
00282 
00283    start = icaltime_from_timet_with_zone(start_time, 0, utc);
00284    end = icaltime_from_timet_with_zone(end_time, 0, utc);
00285    start_str = icaltime_as_ical_string(start);
00286    end_str = icaltime_as_ical_string(end);
00287 
00288    /* If I was really being efficient, I would store a collection of event URIs and etags,
00289     * first doing a query of just the etag and seeing if anything had changed.  If it had,
00290     * then I would do a request for each of the events that had changed, and only bother
00291     * updating those.  Oh well. */
00292    ast_str_append(&body, 0,
00293       "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n"
00294       "<C:calendar-query xmlns:D=\"DAV:\" xmlns:C=\"urn:ietf:params:xml:ns:caldav\">\n"
00295       "  <D:prop>\n"
00296       "    <C:calendar-data>\n"
00297       "      <C:expand start=\"%s\" end=\"%s\"/>\n"
00298       "    </C:calendar-data>\n"
00299       "  </D:prop>\n"
00300       "  <C:filter>\n"
00301       "    <C:comp-filter name=\"VCALENDAR\">\n"
00302       "      <C:comp-filter name=\"VEVENT\">\n"
00303       "        <C:time-range start=\"%s\" end=\"%s\"/>\n"
00304       "      </C:comp-filter>\n"
00305       "    </C:comp-filter>\n"
00306       "  </C:filter>\n"
00307       "</C:calendar-query>\n", start_str, end_str, start_str, end_str);
00308 
00309    response = caldav_request(pvt, "REPORT", body, NULL, NULL);
00310    ast_free(body);
00311    if (response && !ast_str_strlen(response)) {
00312       ast_free(response);
00313       return NULL;
00314    }
00315 
00316    return response;
00317 }
00318 
00319 static time_t icalfloat_to_timet(icaltimetype time) 
00320 {
00321    struct ast_tm tm = {0,};
00322    struct timeval tv;
00323 
00324    tm.tm_mday = time.day;
00325    tm.tm_mon = time.month - 1;
00326    tm.tm_year = time.year - 1900;
00327    tm.tm_hour = time.hour;
00328    tm.tm_min = time.minute;
00329    tm.tm_sec = time.second;
00330    tm.tm_isdst = -1;
00331    tv = ast_mktime(&tm, NULL);
00332 
00333    return tv.tv_sec;
00334 }
00335 
00336 /* span->start & span->end may be dates or floating times which have no timezone,
00337  * which would mean that they should apply to the local timezone for all recepients.
00338  * For example, if a meeting was set for 1PM-2PM floating time, people in different time
00339  * zones would not be scheduled at the same local times.  Dates are often treated as
00340  * floating times, so all day events will need to be converted--so we can trust the
00341  * span here, and instead will grab the start and end from the component, which will
00342  * allow us to test for floating times or dates.
00343  */
00344 static void caldav_add_event(icalcomponent *comp, struct icaltime_span *span, void *data)
00345 {
00346    struct caldav_pvt *pvt = data;
00347    struct ast_calendar_event *event;
00348    icaltimezone *utc = icaltimezone_get_utc_timezone();
00349    icaltimetype start, end, tmp;
00350    icalcomponent *valarm;
00351    icalproperty *prop;
00352    struct icaltriggertype trigger;
00353 
00354    if (!(pvt && pvt->owner)) {
00355       ast_log(LOG_ERROR, "Require a private structure with an owner\n");
00356       return;
00357    }
00358 
00359    if (!(event = ast_calendar_event_alloc(pvt->owner))) {
00360       ast_log(LOG_ERROR, "Could not allocate an event!\n");
00361       return;
00362    }
00363 
00364    start = icalcomponent_get_dtstart(comp);
00365    end = icalcomponent_get_dtend(comp);
00366 
00367    event->start = icaltime_get_tzid(start) ? span->start : icalfloat_to_timet(start);
00368    event->end = icaltime_get_tzid(end) ? span->end : icalfloat_to_timet(end);
00369    event->busy_state = span->is_busy ? AST_CALENDAR_BS_BUSY : AST_CALENDAR_BS_FREE;
00370 
00371    if ((prop = icalcomponent_get_first_property(comp, ICAL_SUMMARY_PROPERTY))) {
00372       ast_string_field_set(event, summary, icalproperty_get_value_as_string(prop));
00373    }
00374 
00375    if ((prop = icalcomponent_get_first_property(comp, ICAL_DESCRIPTION_PROPERTY))) {
00376       ast_string_field_set(event, description, icalproperty_get_value_as_string(prop));
00377    }
00378 
00379    if ((prop = icalcomponent_get_first_property(comp, ICAL_ORGANIZER_PROPERTY))) {
00380       ast_string_field_set(event, organizer, icalproperty_get_value_as_string(prop));
00381    }
00382 
00383    if ((prop = icalcomponent_get_first_property(comp, ICAL_LOCATION_PROPERTY))) {
00384       ast_string_field_set(event, location, icalproperty_get_value_as_string(prop));
00385    }
00386 
00387    if ((prop = icalcomponent_get_first_property(comp, ICAL_CATEGORIES_PROPERTY))) {
00388       ast_string_field_set(event, categories, icalproperty_get_value_as_string(prop));
00389    }
00390 
00391    if ((prop = icalcomponent_get_first_property(comp, ICAL_PRIORITY_PROPERTY))) {
00392       event->priority = icalvalue_get_integer(icalproperty_get_value(prop));
00393    }
00394 
00395    if ((prop = icalcomponent_get_first_property(comp, ICAL_UID_PROPERTY))) {
00396       ast_string_field_set(event, uid, icalproperty_get_value_as_string(prop));
00397    } else {
00398       ast_log(LOG_WARNING, "No UID found, but one is required. Generating, but updates may not be acurate\n");
00399       if (!ast_strlen_zero(event->summary)) {
00400          ast_string_field_set(event, uid, event->summary);
00401       } else {
00402          char tmp[100];
00403          snprintf(tmp, sizeof(tmp), "%lu", event->start);
00404          ast_string_field_set(event, uid, tmp);
00405       }
00406    }
00407 
00408    /* Get the attendees */
00409    for (prop = icalcomponent_get_first_property(comp, ICAL_ATTENDEE_PROPERTY);
00410          prop; prop = icalcomponent_get_next_property(comp, ICAL_ATTENDEE_PROPERTY)) {
00411       struct ast_calendar_attendee *attendee;
00412       const char *data;
00413 
00414       if (!(attendee = ast_calloc(1, sizeof(*attendee)))) {
00415          event = ast_calendar_unref_event(event);
00416          return;
00417       }
00418       data = icalproperty_get_attendee(prop);
00419       if (ast_strlen_zero(data)) {
00420          ast_free(attendee);
00421          continue;
00422       }
00423       attendee->data = ast_strdup(data);
00424       AST_LIST_INSERT_TAIL(&event->attendees, attendee, next);
00425    }
00426 
00427 
00428    /* Only set values for alarm based on VALARM.  Can be overriden in main/calendar.c by autoreminder
00429     * therefore, go ahead and add events even if their is no VALARM or it is malformed
00430     * Currently we are only getting the first VALARM and are handling repitition in main/calendar.c from calendar.conf */
00431    if (!(valarm = icalcomponent_get_first_component(comp, ICAL_VALARM_COMPONENT))) {
00432       ao2_link(pvt->events, event);
00433       event = ast_calendar_unref_event(event);
00434       return;
00435    }
00436 
00437    if (!(prop = icalcomponent_get_first_property(valarm, ICAL_TRIGGER_PROPERTY))) {
00438       ast_log(LOG_WARNING, "VALARM has no TRIGGER, skipping!\n");
00439       ao2_link(pvt->events, event);
00440       event = ast_calendar_unref_event(event);
00441       return;
00442    }
00443 
00444    trigger = icalproperty_get_trigger(prop);
00445 
00446    if (icaltriggertype_is_null_trigger(trigger)) {
00447       ast_log(LOG_WARNING, "Bad TRIGGER for VALARM, skipping!\n");
00448       ao2_link(pvt->events, event);
00449       event = ast_calendar_unref_event(event);
00450       return;
00451    }
00452 
00453    if (!icaltime_is_null_time(trigger.time)) { /* This is an absolute time */
00454       tmp = icaltime_convert_to_zone(trigger.time, utc);
00455       event->alarm = icaltime_as_timet_with_zone(tmp, utc);
00456    } else { /* Offset from either dtstart or dtend */
00457       /* XXX Technically you can check RELATED to see if the event fires from the END of the event
00458        * But, I'm not sure I've ever seen anyone implement it in calendaring software, so I'm ignoring for now */
00459       tmp = icaltime_add(start, trigger.duration);
00460       event->alarm = icaltime_as_timet_with_zone(tmp, icaltime_get_timezone(start));
00461    }
00462 
00463    ao2_link(pvt->events, event);
00464    event = ast_calendar_unref_event(event);
00465 
00466    return;
00467 }
00468 
00469 struct xmlstate {
00470    int in_caldata;
00471    struct caldav_pvt *pvt;
00472    struct ast_str *cdata;
00473    time_t start;
00474    time_t end;
00475 };
00476 
00477 static void handle_start_element(void *data, const xmlChar *fullname, const xmlChar **atts)
00478 {
00479    struct xmlstate *state = data;
00480 
00481    if (!xmlStrcasecmp(fullname, BAD_CAST "C:calendar-data")) {
00482       state->in_caldata = 1;
00483       ast_str_reset(state->cdata);
00484    }
00485 }
00486 
00487 static void handle_end_element(void *data, const xmlChar *name)
00488 {
00489    struct xmlstate *state = data;
00490    struct icaltimetype start, end;
00491    icaltimezone *utc = icaltimezone_get_utc_timezone();
00492    icalcomponent *iter;
00493    icalcomponent *comp;
00494 
00495    if (xmlStrcasecmp(name, BAD_CAST "C:calendar-data")) {
00496       return;
00497    }
00498 
00499    state->in_caldata = 0;
00500    if (!(state->cdata && ast_str_strlen(state->cdata))) {
00501       return;
00502    }
00503    /* XXX Parse the calendar blurb for recurrence events in the time range,
00504     * create an event, and add it to pvt->events */
00505    start = icaltime_from_timet_with_zone(state->start, 0, utc);
00506    end = icaltime_from_timet_with_zone(state->end, 0, utc);
00507    comp = icalparser_parse_string(ast_str_buffer(state->cdata));
00508 
00509    for (iter = icalcomponent_get_first_component(comp, ICAL_VEVENT_COMPONENT);
00510         iter;
00511         iter = icalcomponent_get_next_component(comp, ICAL_VEVENT_COMPONENT))
00512    {
00513       icalcomponent_foreach_recurrence(iter, start, end, caldav_add_event, state->pvt);
00514    }
00515 
00516    icalcomponent_free(comp);
00517 }
00518 
00519 static void handle_characters(void *data, const xmlChar *ch, int len)
00520 {
00521    struct xmlstate *state = data;
00522    xmlChar *tmp;
00523 
00524    if (!state->in_caldata) {
00525       return;
00526    }
00527 
00528    tmp = xmlStrndup(ch, len);
00529    ast_str_append(&state->cdata, 0, "%s", (char *)tmp);
00530    xmlFree(tmp);
00531 }
00532 
00533 static int update_caldav(struct caldav_pvt *pvt)
00534 {
00535    struct timeval now = ast_tvnow();
00536    time_t start, end;
00537    struct ast_str *response;
00538    xmlSAXHandler saxHandler;
00539    struct xmlstate state = {
00540       .in_caldata = 0,
00541       .pvt = pvt
00542    };
00543 
00544    start = now.tv_sec;
00545    end = now.tv_sec + 60 * pvt->owner->timeframe;
00546    if (!(response = caldav_get_events_between(pvt, start, end))) {
00547       return -1;
00548    }
00549 
00550    if (!(state.cdata = ast_str_create(512))) {
00551       ast_free(response);
00552       return -1;
00553    }
00554 
00555    state.start = start;
00556    state.end = end;
00557 
00558    memset(&saxHandler, 0, sizeof(saxHandler));
00559    saxHandler.startElement = handle_start_element;
00560    saxHandler.endElement = handle_end_element;
00561    saxHandler.characters = handle_characters;
00562 
00563    xmlSAXUserParseMemory(&saxHandler, &state, ast_str_buffer(response), ast_str_strlen(response));
00564 
00565    ast_calendar_merge_events(pvt->owner, pvt->events);
00566 
00567    ast_free(response);
00568    ast_free(state.cdata);
00569 
00570    return 0;
00571 }
00572 
00573 static int verify_cert(void *userdata, int failures, const ne_ssl_certificate *cert)
00574 {
00575    /* Verify all certs */
00576    return 0;
00577 }
00578 
00579 static void *caldav_load_calendar(void *void_data)
00580 {
00581    struct caldav_pvt *pvt;
00582    const struct ast_config *cfg;
00583    struct ast_variable *v;
00584    struct ast_calendar *cal = void_data;
00585    ast_mutex_t refreshlock;
00586 
00587    if (!(cal && (cfg = ast_calendar_config_acquire()))) {
00588       ast_log(LOG_ERROR, "You must enable calendar support for res_caldav to load\n");
00589       return NULL;
00590    }
00591 
00592    if (ao2_trylock(cal)) {
00593       if (cal->unloading) {
00594          ast_log(LOG_WARNING, "Unloading module, load_calendar cancelled.\n");
00595       } else {
00596          ast_log(LOG_WARNING, "Could not lock calendar, aborting!\n");
00597       }
00598       ast_calendar_config_release();
00599       return NULL;
00600    }
00601 
00602    if (!(pvt = ao2_alloc(sizeof(*pvt), caldav_destructor))) {
00603       ast_log(LOG_ERROR, "Could not allocate caldav_pvt structure for calendar: %s\n", cal->name);
00604       ast_calendar_config_release();
00605       return NULL;
00606    }
00607 
00608    pvt->owner = cal;
00609 
00610    if (!(pvt->events = ast_calendar_event_container_alloc())) {
00611       ast_log(LOG_ERROR, "Could not allocate space for fetching events 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    if (ast_string_field_init(pvt, 32)) {
00619       ast_log(LOG_ERROR, "Couldn't allocate string field space for calendar: %s\n", cal->name);
00620       pvt = unref_caldav(pvt);
00621       ao2_unlock(cal);
00622       ast_calendar_config_release();
00623       return NULL;
00624    }
00625 
00626    for (v = ast_variable_browse(cfg, cal->name); v; v = v->next) {
00627       if (!strcasecmp(v->name, "url")) {
00628          ast_string_field_set(pvt, url, v->value);
00629       } else if (!strcasecmp(v->name, "user")) {
00630          ast_string_field_set(pvt, user, v->value);
00631       } else if (!strcasecmp(v->name, "secret")) {
00632          ast_string_field_set(pvt, secret, v->value);
00633       }
00634    }
00635 
00636    ast_calendar_config_release();
00637 
00638    if (ast_strlen_zero(pvt->url)) {
00639       ast_log(LOG_WARNING, "No URL was specified for CalDAV calendar '%s' - skipping.\n", cal->name);
00640       pvt = unref_caldav(pvt);
00641       ao2_unlock(cal);
00642       return NULL;
00643    }
00644 
00645    if (ne_uri_parse(pvt->url, &pvt->uri) || pvt->uri.host == NULL || pvt->uri.path == NULL) {
00646       ast_log(LOG_WARNING, "Could not parse url '%s' for CalDAV calendar '%s' - skipping.\n", pvt->url, cal->name);
00647       pvt = unref_caldav(pvt);
00648       ao2_unlock(cal);
00649       return NULL;
00650    }
00651 
00652    if (pvt->uri.scheme == NULL) {
00653       pvt->uri.scheme = "http";
00654    }
00655 
00656    if (pvt->uri.port == 0) {
00657       pvt->uri.port = ne_uri_defaultport(pvt->uri.scheme);
00658    }
00659 
00660    pvt->session = ne_session_create(pvt->uri.scheme, pvt->uri.host, pvt->uri.port);
00661    ne_redirect_register(pvt->session);
00662    ne_set_server_auth(pvt->session, auth_credentials, pvt);
00663    if (!strcasecmp(pvt->uri.scheme, "https")) {
00664       ne_ssl_trust_default_ca(pvt->session);
00665       ne_ssl_set_verify(pvt->session, verify_cert, NULL);
00666    }
00667 
00668    cal->tech_pvt = pvt;
00669 
00670    ast_mutex_init(&refreshlock);
00671 
00672    /* Load it the first time */
00673    update_caldav(pvt);
00674 
00675    ao2_unlock(cal);
00676 
00677    /* The only writing from another thread will be if unload is true */
00678    for (;;) {
00679       struct timeval tv = ast_tvnow();
00680       struct timespec ts = {0,};
00681 
00682       ts.tv_sec = tv.tv_sec + (60 * pvt->owner->refresh);
00683 
00684       ast_mutex_lock(&refreshlock);
00685       while (!pvt->owner->unloading) {
00686          if (ast_cond_timedwait(&pvt->owner->unload, &refreshlock, &ts) == ETIMEDOUT) {
00687             break;
00688          }
00689       }
00690       ast_mutex_unlock(&refreshlock);
00691 
00692       if (pvt->owner->unloading) {
00693          ast_debug(10, "Skipping refresh since we got a shutdown signal\n");
00694          return NULL;
00695       }
00696 
00697       ast_debug(10, "Refreshing after %d minute timeout\n", pvt->owner->refresh);
00698 
00699       update_caldav(pvt);
00700    }
00701 
00702    return NULL;
00703 }
00704 
00705 static int load_module(void)
00706 {
00707    ne_sock_init();
00708    if (ast_calendar_register(&caldav_tech)) {
00709       ne_sock_exit();
00710       return AST_MODULE_LOAD_DECLINE;
00711    }
00712 
00713    return AST_MODULE_LOAD_SUCCESS;
00714 }
00715 
00716 static int unload_module(void)
00717 {
00718    ast_calendar_unregister(&caldav_tech);
00719    ne_sock_exit();
00720    return 0;
00721 }
00722 
00723 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Asterisk CalDAV Calendar Integration",
00724       .load = load_module,
00725       .unload = unload_module,
00726       .load_pri = AST_MODPRI_DEVSTATE_PLUGIN,
00727    );

Generated on Thu Oct 11 06:33:52 2012 for Asterisk - The Open Source Telephony Project by  doxygen 1.5.6