Mon Jun 27 16:50:55 2011

Asterisk developer's documentation


res_calendar_exchange.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 MS Exchange calendars
00021  */
00022 
00023 /*** MODULEINFO
00024    <depend>neon</depend>
00025    <depend>ical</depend>
00026    <depend>iksemel</depend>
00027 ***/
00028 #include "asterisk.h"
00029 
00030 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 300214 $")
00031 
00032 #include <libical/ical.h>
00033 #include <ne_session.h>
00034 #include <ne_uri.h>
00035 #include <ne_request.h>
00036 #include <ne_auth.h>
00037 #include <ne_redirect.h>
00038 #include <iksemel.h>
00039 
00040 #include "asterisk/module.h"
00041 #include "asterisk/calendar.h"
00042 #include "asterisk/lock.h"
00043 #include "asterisk/config.h"
00044 #include "asterisk/astobj2.h"
00045 
00046 static void *exchangecal_load_calendar(void *data);
00047 static void *unref_exchangecal(void *obj);
00048 static int exchangecal_write_event(struct ast_calendar_event *event);
00049 
00050 static struct ast_calendar_tech exchangecal_tech = {
00051    .type = "exchange",
00052    .description = "MS Exchange calendars",
00053    .module = AST_MODULE,
00054    .load_calendar = exchangecal_load_calendar,
00055    .unref_calendar = unref_exchangecal,
00056    .write_event = exchangecal_write_event,
00057 };
00058 
00059 struct exchangecal_pvt {
00060    AST_DECLARE_STRING_FIELDS(
00061       AST_STRING_FIELD(url);
00062       AST_STRING_FIELD(user);
00063       AST_STRING_FIELD(secret);
00064    );
00065    struct ast_calendar *owner;
00066    ne_uri uri;
00067    ne_session *session;
00068    struct ao2_container *events;
00069 };
00070 
00071 struct xmlstate {
00072    char tag[80];
00073    int in_response;
00074    int in_propstat;
00075    int in_prop;
00076    void *ptr;
00077    struct exchangecal_pvt *pvt;
00078 };
00079 
00080 static int parse_tag(void *data, char *name, char **atts, int type)
00081 {
00082    struct xmlstate *state = data;
00083    char *tmp;
00084 
00085    if ((tmp = strchr(name, ':'))) {
00086       tmp++;
00087    } else {
00088       return IKS_HOOK;
00089    }
00090 
00091    ast_copy_string(state->tag, tmp, sizeof(state->tag));
00092 
00093    switch (type) {
00094    case IKS_OPEN:
00095       if (!strcasecmp(state->tag, "response")) {
00096          struct ast_calendar_event *event;
00097 
00098          state->in_response = 1;
00099          if (!(event = ast_calendar_event_alloc(state->pvt->owner))) {
00100             return IKS_NOMEM;
00101          }
00102          state->ptr = event;
00103       } else if (!strcasecmp(state->tag, "propstat")) {
00104          state->in_propstat = 1;
00105       } else if (!strcasecmp(state->tag, "prop")) {
00106          state->in_prop = 1;
00107       }
00108       break;
00109 
00110    case IKS_CLOSE:
00111       if (!strcasecmp(state->tag, "response")) {
00112          struct ao2_container *events = state->pvt->events;
00113          struct ast_calendar_event *event = state->ptr;
00114 
00115          state->in_response = 0;
00116          if (ast_strlen_zero(event->uid)) {
00117             ast_log(LOG_ERROR, "This event has no UID, something has gone wrong\n");
00118             event = ast_calendar_unref_event(event);
00119             return IKS_HOOK;
00120          }
00121          ao2_link(events, event);
00122          event = ast_calendar_unref_event(event);
00123       } else if (!strcasecmp(state->tag, "propstat")) {
00124          state->in_propstat = 0;
00125       } else if (!strcasecmp(state->tag, "prop")) {
00126          state->in_prop = 0;
00127       }
00128       break;
00129 
00130    default:
00131       return IKS_OK;
00132    }
00133 
00134    return IKS_OK;
00135 }
00136 
00137 static time_t mstime_to_time_t(char *mstime)
00138 {
00139    char *read, *write;
00140    icaltimetype tt;
00141    for (read = write = mstime; *read; read++) {
00142       if (*read == '.') {
00143          *write++ = 'Z';
00144          *write = '\0';
00145          break;
00146       }
00147       if (*read == '-' || *read == ':')
00148          continue;
00149       *write = *read;
00150       write++;
00151    }
00152 
00153    tt = icaltime_from_string(mstime);
00154    return icaltime_as_timet(tt);
00155 }
00156 
00157 static enum ast_calendar_busy_state msbusy_to_bs(const char *msbusy)
00158 {
00159    if (!strcasecmp(msbusy, "FREE")) {
00160       return AST_CALENDAR_BS_FREE;
00161    } else if (!strcasecmp(msbusy, "TENTATIVE")) {
00162       return AST_CALENDAR_BS_BUSY_TENTATIVE;
00163    } else {
00164       return AST_CALENDAR_BS_BUSY;
00165    }
00166 }
00167 
00168 static int parse_cdata(void *data, char *value, size_t len)
00169 {
00170    char *str;
00171    struct xmlstate *state = data;
00172    struct ast_calendar_event *event = state->ptr;
00173 
00174 
00175    str = ast_skip_blanks(value);
00176 
00177    if (str == value + len)
00178       return IKS_OK;
00179 
00180    if (!(str = ast_calloc(1, len + 1))) {
00181       return IKS_NOMEM;
00182    }
00183    memcpy(str, value, len);
00184    if (!(state->in_response && state->in_propstat && state->in_prop)) {
00185       ast_free(str);
00186       return IKS_OK;
00187    }
00188    /* We use ast_string_field_build here because libiksemel is parsing CDATA with &lt; as
00189     * new elements which is a bit odd and shouldn't happen */
00190    if (!strcasecmp(state->tag, "subject")) {
00191       ast_string_field_build(event, summary, "%s%s", event->summary, str);
00192    } else if (!strcasecmp(state->tag, "location")) {
00193       ast_string_field_build(event, location, "%s%s", event->location, str);
00194    } else if (!strcasecmp(state->tag, "uid")) {
00195       ast_string_field_build(event, uid, "%s%s", event->location, str);
00196    } else if (!strcasecmp(state->tag, "organizer")) {
00197       ast_string_field_build(event, organizer, "%s%s", event->organizer, str);
00198    } else if (!strcasecmp(state->tag, "textdescription")) {
00199       ast_string_field_build(event, description, "%s%s", event->description, str);
00200    } else if (!strcasecmp(state->tag, "dtstart")) {
00201       event->start = mstime_to_time_t(str);
00202    } else if (!strcasecmp(state->tag, "dtend")) {
00203       event->end = mstime_to_time_t(str);
00204    } else if (!strcasecmp(state->tag, "busystatus")) {
00205       event->busy_state = msbusy_to_bs(str);
00206    } else if (!strcasecmp(state->tag, "reminderoffset")) {
00207       /*XXX Currently we rely on event->start being set first which means we rely on the response order
00208        * which technically should be fine since the query returns in the order we ask for, but ... */
00209       event->alarm = event->start - atoi(str);
00210    }
00211 
00212    ast_free(str);
00213    return IKS_OK;
00214 }
00215 
00216 static void exchangecal_destructor(void *obj)
00217 {
00218    struct exchangecal_pvt *pvt = obj;
00219 
00220    ast_debug(1, "Destroying pvt for Exchange calendar %s\n", pvt->owner->name);
00221    if (pvt->session) {
00222       ne_session_destroy(pvt->session);
00223    }
00224    ast_string_field_free_memory(pvt);
00225 
00226    ao2_callback(pvt->events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL);
00227 
00228    ao2_ref(pvt->events, -1);
00229 }
00230 
00231 static void *unref_exchangecal(void *obj)
00232 {
00233    struct exchangecal_pvt *pvt = obj;
00234 
00235    ao2_ref(pvt, -1);
00236    return NULL;
00237 }
00238 
00239 /* It is very important to use the return value of this function as a realloc could occur */
00240 static struct ast_str *generate_exchange_uuid(struct ast_str *uid)
00241 {
00242    unsigned short val[8];
00243    int x;
00244 
00245    for (x = 0; x < 8; x++) {
00246       val[x] = ast_random();
00247    }
00248    ast_str_set(&uid, 0, "%04x%04x-%04x-%04x-%04x-%04x%04x%04x", val[0], val[1], val[2], val[3], val[4], val[5], val[6], val[7]);
00249 
00250    return uid;
00251 }
00252 
00253 static int is_valid_uuid(struct ast_str *uid)
00254 {
00255    int i;
00256 
00257    if (ast_str_strlen(uid) != 36) {
00258       return 0;
00259    }
00260 
00261    for (i = 0; i < ast_str_strlen(uid); i++) {
00262       if (i == 8 || i == 13 || i == 18 || i == 23) {
00263          if (ast_str_buffer(uid)[i] != '-') {
00264             return 0;
00265          }
00266       } else if (!((ast_str_buffer(uid)[i] > 47 && ast_str_buffer(uid)[i] < 58) || (ast_str_buffer(uid)[i] > 96 && ast_str_buffer(uid)[i] < 103))) {
00267          return 0;
00268       }
00269    }
00270 
00271    return 1;
00272 }
00273 
00274 static struct ast_str *xml_encode_str(struct ast_str *dst, const char *src)
00275 {
00276    const char *tmp;
00277    char buf[7];
00278 
00279    for (tmp = src; *tmp; tmp++) {
00280       switch (*tmp) {
00281       case '\"':
00282          strcpy(buf, "&quot;");
00283          break;
00284 
00285       case '\'':
00286          strcpy(buf, "&apos;");
00287          break;
00288 
00289       case '&':
00290          strcpy(buf, "&amp;");
00291          break;
00292 
00293       case '<':
00294          strcpy(buf, "&lt;");
00295          break;
00296 
00297       case '>':
00298          strcpy(buf, "&gt;");
00299          break;
00300 
00301       default:
00302          sprintf(buf, "%c", *tmp);
00303       }
00304 
00305       ast_str_append(&dst, 0, "%s", buf);
00306    }
00307 
00308    return dst;
00309 }
00310 
00311 static struct ast_str *epoch_to_exchange_time(struct ast_str *dst, time_t epoch)
00312 {
00313    icaltimezone *utc = icaltimezone_get_utc_timezone();
00314    icaltimetype tt = icaltime_from_timet_with_zone(epoch, 0, utc);
00315    char tmp[30];
00316    int i;
00317 
00318    ast_copy_string(tmp, icaltime_as_ical_string(tt), sizeof(tmp));
00319    for (i = 0; tmp[i]; i++) {
00320       ast_str_append(&dst, 0, "%c", tmp[i]);
00321       if (i == 3 || i == 5)
00322          ast_str_append(&dst, 0, "%c", '-');
00323       if (i == 10 || i == 12)
00324          ast_str_append(&dst, 0, "%c", ':');
00325       if (i == 14)
00326          ast_str_append(&dst, 0, "%s", ".000");
00327    }
00328 
00329    return dst;
00330 }
00331 
00332 static struct ast_str *bs_to_exchange_bs(struct ast_str *dst, enum ast_calendar_busy_state bs)
00333 {
00334    switch (bs) {
00335    case AST_CALENDAR_BS_BUSY:
00336       ast_str_set(&dst, 0, "%s", "BUSY");
00337       break;
00338 
00339    case AST_CALENDAR_BS_BUSY_TENTATIVE:
00340       ast_str_set(&dst, 0, "%s", "TENTATIVE");
00341       break;
00342 
00343    default:
00344       ast_str_set(&dst, 0, "%s", "FREE");
00345    }
00346 
00347    return dst;
00348 }
00349 
00350 static int fetch_response_reader(void *data, const char *block, size_t len)
00351 {
00352    struct ast_str **response = data;
00353    unsigned char *tmp;
00354 
00355    if (!(tmp = ast_malloc(len + 1))) {
00356       return -1;
00357    }
00358    memcpy(tmp, block, len);
00359    tmp[len] = '\0';
00360    ast_str_append(response, 0, "%s", tmp);
00361    ast_free(tmp);
00362 
00363    return 0;
00364 }
00365 
00366 static int auth_credentials(void *userdata, const char *realm, int attempts, char *username, char *secret)
00367 {
00368    struct exchangecal_pvt *pvt = userdata;
00369 
00370    if (attempts > 1) {
00371       ast_log(LOG_WARNING, "Invalid username or password for Exchange calendar '%s'\n", pvt->owner->name);
00372       return -1;
00373    }
00374 
00375    ne_strnzcpy(username, pvt->user, NE_ABUFSIZ);
00376    ne_strnzcpy(secret, pvt->secret, NE_ABUFSIZ);
00377 
00378    return 0;
00379 }
00380 
00381 static struct ast_str *exchangecal_request(struct exchangecal_pvt *pvt, const char *method, struct ast_str *req_body, struct ast_str *subdir)
00382 {
00383    struct ast_str *response;
00384    ne_request *req;
00385    int ret;
00386    char buf[1000];
00387 
00388    if (!pvt) {
00389       ast_log(LOG_ERROR, "There is no private!\n");
00390       return NULL;
00391    }
00392 
00393    if (!(response = ast_str_create(512))) {
00394       ast_log(LOG_ERROR, "Could not allocate memory for response.\n");
00395       return NULL;
00396    }
00397 
00398    snprintf(buf, sizeof(buf), "%s%s", pvt->uri.path, subdir ? ast_str_buffer(subdir) : "");
00399 
00400    req = ne_request_create(pvt->session, method, buf);
00401    ne_add_response_body_reader(req, ne_accept_2xx, fetch_response_reader, &response);
00402    ne_set_request_body_buffer(req, ast_str_buffer(req_body), ast_str_strlen(req_body));
00403    ne_add_request_header(req, "Content-type", "text/xml");
00404 
00405    ret = ne_request_dispatch(req);
00406    ne_request_destroy(req);
00407 
00408    if (ret != NE_OK || !ast_str_strlen(response)) {
00409       ast_log(LOG_WARNING, "Unknown response to CalDAV calendar %s, request %s to %s: %s\n", pvt->owner->name, method, pvt->url, ne_get_error(pvt->session));
00410       ast_free(response);
00411       return NULL;
00412    }
00413 
00414    return response;
00415 }
00416 
00417 static int exchangecal_write_event(struct ast_calendar_event *event)
00418 {
00419    struct ast_str *body = NULL, *response = NULL, *subdir = NULL;
00420    struct ast_str *uid = NULL, *summary = NULL, *description = NULL, *organizer = NULL,
00421                   *location = NULL, *start = NULL, *end = NULL, *busystate = NULL;
00422    int ret = -1;
00423 
00424    if (!event) {
00425       ast_log(LOG_WARNING, "No event passed!\n");
00426       return -1;
00427    }
00428 
00429    if (!(event->start && event->end)) {
00430       ast_log(LOG_WARNING, "The event must contain a start and an end\n");
00431       return -1;
00432    }
00433    if (!(body = ast_str_create(512)) ||
00434       !(subdir = ast_str_create(32)) ||
00435       !(response = ast_str_create(512))) {
00436       ast_log(LOG_ERROR, "Could not allocate memory for request and response!\n");
00437       goto write_cleanup;
00438    }
00439 
00440    if (!(uid = ast_str_create(32)) ||
00441       !(summary = ast_str_create(32)) ||
00442       !(description = ast_str_create(32)) ||
00443       !(organizer = ast_str_create(32)) ||
00444       !(location = ast_str_create(32)) ||
00445       !(start = ast_str_create(32)) ||
00446       !(end = ast_str_create(32)) ||
00447       !(busystate = ast_str_create(32))) {
00448       ast_log(LOG_ERROR, "Unable to allocate memory for request values\n");
00449       goto write_cleanup;
00450    }
00451 
00452    if (ast_strlen_zero(event->uid)) {
00453       uid = generate_exchange_uuid(uid);
00454    } else {
00455       ast_str_set(&uid, 36, "%s", event->uid);
00456    }
00457 
00458    if (!is_valid_uuid(uid)) {
00459       ast_log(LOG_WARNING, "An invalid uid was provided, you may leave this field blank to have one generated for you\n");
00460       goto write_cleanup;
00461    }
00462 
00463    summary = xml_encode_str(summary, event->summary);
00464    description = xml_encode_str(description, event->description);
00465    organizer = xml_encode_str(organizer, event->organizer);
00466    location = xml_encode_str(location, event->location);
00467    start = epoch_to_exchange_time(start, event->start);
00468    end = epoch_to_exchange_time(end, event->end);
00469    busystate = bs_to_exchange_bs(busystate, event->busy_state);
00470 
00471    ast_str_append(&body, 0,
00472       "<?xml version=\"1.0\"?>\n"
00473       "<a:propertyupdate\n"
00474       "  xmlns:a=\"DAV:\"\n"
00475       "  xmlns:e=\"http://schemas.microsoft.com/exchange/\"\n"
00476       "  xmlns:mapi=\"http://schemas.microsoft.com/mapi/\"\n"
00477       "  xmlns:mapit=\"http://schemas.microsoft.com/mapi/proptag/\"\n"
00478       "  xmlns:x=\"xml:\" xmlns:cal=\"urn:schemas:calendar:\"\n"
00479       "  xmlns:dt=\"uuid:%s/\"\n" /* uid */
00480       "  xmlns:header=\"urn:schemas:mailheader:\"\n"
00481       "  xmlns:mail=\"urn:schemas:httpmail:\"\n"
00482       ">\n"
00483       "    <a:set>\n"
00484       "      <a:prop>\n"
00485       "        <a:contentclass>urn:content-classes:appointment</a:contentclass>\n"
00486       "        <e:outlookmessageclass>IPM.Appointment</e:outlookmessageclass>\n"
00487       "        <mail:subject>%s</mail:subject>\n" /* summary */
00488       "        <mail:description>%s</mail:description>\n" /* description */
00489       "        <header:to>%s</header:to>\n" /* organizer */
00490       "        <cal:location>%s</cal:location>\n" /* location */
00491       "        <cal:dtstart dt:dt=\"dateTime.tz\">%s</cal:dtstart>\n" /* start */
00492       "        <cal:dtend dt:dt=\"dateTime.tz\">%s</cal:dtend>\n" /* end */
00493       "        <cal:instancetype dt:dt=\"int\">0</cal:instancetype>\n"
00494       "        <cal:busystatus>%s</cal:busystatus>\n" /* busy_state (BUSY, FREE, BUSY_TENTATIVE) */
00495       "        <cal:meetingstatus>CONFIRMED</cal:meetingstatus>\n"
00496       "        <cal:alldayevent dt:dt=\"boolean\">0</cal:alldayevent>\n" /* XXX need to add event support for all day events */
00497       "        <cal:responserequested dt:dt=\"boolean\">0</cal:responserequested>\n"
00498       "        <mapi:finvited dt:dt=\"boolean\">1</mapi:finvited>\n"
00499       "      </a:prop>\n"
00500       "    </a:set>\n"
00501       "</a:propertyupdate>\n",
00502       ast_str_buffer(uid), ast_str_buffer(summary), ast_str_buffer(description), ast_str_buffer(organizer), ast_str_buffer(location), ast_str_buffer(start), ast_str_buffer(end), ast_str_buffer(busystate));
00503    ast_verb(0, "\n\n%s\n\n", ast_str_buffer(body));
00504    ast_str_set(&subdir, 0, "/Calendar/%s.eml", ast_str_buffer(uid));
00505 
00506    response = exchangecal_request(event->owner->tech_pvt, "PROPPATCH", body, subdir);
00507 
00508    ret = 0;
00509 write_cleanup:
00510    if (uid) {
00511       ast_free(uid);
00512    }
00513    if (summary) {
00514       ast_free(summary);
00515    }
00516    if (description) {
00517       ast_free(description);
00518    }
00519    if (organizer) {
00520       ast_free(organizer);
00521    }
00522    if (location) {
00523       ast_free(location);
00524    }
00525    if (start) {
00526       ast_free(start);
00527    }
00528    if (end) {
00529       ast_free(end);
00530    }
00531    if (busystate) {
00532       ast_free(busystate);
00533    }
00534    if (body) {
00535       ast_free(body);
00536    }
00537    if (response) {
00538       ast_free(response);
00539    }
00540    if (subdir) {
00541       ast_free(subdir);
00542    }
00543 
00544    return ret;
00545 }
00546 
00547 
00548 static struct ast_str *exchangecal_get_events_between(struct exchangecal_pvt *pvt, time_t start_time, time_t end_time)
00549 {
00550    struct ast_str *body, *response;
00551    char start[80], end[80];
00552    struct timeval tv = {0,};
00553    struct ast_tm tm;
00554 
00555    tv.tv_sec = start_time;
00556    ast_localtime(&tv, &tm, "UTC");
00557    ast_strftime(start, sizeof(start), "%Y/%m/%d %T", &tm);
00558 
00559    tv.tv_sec = end_time;
00560    ast_localtime(&tv, &tm, "UTC");
00561    ast_strftime(end, sizeof(end), "%Y/%m/%d %T", &tm);
00562 
00563    if (!(body = ast_str_create(512))) {
00564       ast_log(LOG_ERROR, "Could not allocate memory for body of request!\n");
00565       return NULL;
00566    }
00567 
00568    ast_str_append(&body, 0,
00569       "<?xml version=\"1.0\"?>\n"
00570       "<g:searchrequest xmlns:g=\"DAV:\">\n"
00571       "        <g:sql> SELECT \"urn:schemas:calendar:location\", \"urn:schemas:httpmail:subject\",\n"
00572       "                \"urn:schemas:calendar:dtstart\", \"urn:schemas:calendar:dtend\",\n"
00573       "                \"urn:schemas:calendar:busystatus\", \"urn:schemas:calendar:instancetype\",\n"
00574       "                \"urn:schemas:calendar:uid\", \"urn:schemas:httpmail:textdescription\",\n"
00575       "                \"urn:schemas:calendar:organizer\", \"urn:schemas:calendar:reminderoffset\"\n"
00576       "                FROM Scope('SHALLOW TRAVERSAL OF \"%s/Calendar\"')\n"
00577       "                WHERE NOT \"urn:schemas:calendar:instancetype\" = 1\n"
00578       "                AND \"DAV:contentclass\" = 'urn:content-classes:appointment'\n"
00579       "                AND NOT (\"urn:schemas:calendar:dtend\" &lt; '%s'\n"
00580       "                OR \"urn:schemas:calendar:dtstart\" &gt; '%s')\n"
00581       "                ORDER BY \"urn:schemas:calendar:dtstart\" ASC\n"
00582       "         </g:sql>\n"
00583       "</g:searchrequest>\n", pvt->url, start, end);
00584 
00585    ast_debug(5, "Request:\n%s\n", ast_str_buffer(body));
00586    response = exchangecal_request(pvt, "SEARCH", body, NULL);
00587    ast_debug(5, "Response:\n%s\n", ast_str_buffer(response));
00588    ast_free(body);
00589 
00590    return response;
00591 }
00592 
00593 static int update_exchangecal(struct exchangecal_pvt *pvt)
00594 {
00595    struct xmlstate state;
00596    struct timeval now = ast_tvnow();
00597    time_t start, end;
00598    struct ast_str *response;
00599    iksparser *p;
00600 
00601    state.pvt = pvt;
00602    start = now.tv_sec;
00603    end = now.tv_sec + 60 * pvt->owner->timeframe;
00604    if (!(response = exchangecal_get_events_between(pvt, start, end))) {
00605       return -1;
00606    }
00607 
00608    p = iks_sax_new(&state, parse_tag, parse_cdata);
00609    iks_parse(p, ast_str_buffer(response), ast_str_strlen(response), 1);
00610    ast_calendar_merge_events(pvt->owner, pvt->events);
00611    ast_free(response);
00612 
00613    return 0;
00614 }
00615 
00616 static void *exchangecal_load_calendar(void *void_data)
00617 {
00618    struct exchangecal_pvt *pvt;
00619    const struct ast_config *cfg;
00620    struct ast_variable *v;
00621    struct ast_calendar *cal = void_data;
00622    ast_mutex_t refreshlock;
00623 
00624    if (!(cal && (cfg = ast_calendar_config_acquire()))) {
00625       ast_log(LOG_ERROR, "You must enable calendar support for res_exchangecal to load\n");
00626       return NULL;
00627    }
00628 
00629    if (ao2_trylock(cal)) {
00630       if (cal->unloading) {
00631          ast_log(LOG_WARNING, "Unloading module, load_calendar cancelled.\n");
00632       } else {
00633          ast_log(LOG_WARNING, "Could not lock calendar, aborting!\n");
00634       }
00635       ast_calendar_config_release();
00636       return NULL;
00637    }
00638 
00639    if (!(pvt = ao2_alloc(sizeof(*pvt), exchangecal_destructor))) {
00640       ast_log(LOG_ERROR, "Could not allocate exchangecal_pvt structure for calendar: %s\n", cal->name);
00641       ast_calendar_config_release();
00642       return NULL;
00643    }
00644 
00645    pvt->owner = cal;
00646 
00647    if (!(pvt->events = ast_calendar_event_container_alloc())) {
00648       ast_log(LOG_ERROR, "Could not allocate space for fetching events for calendar: %s\n", cal->name);
00649       pvt = unref_exchangecal(pvt);
00650       ao2_unlock(cal);
00651       ast_calendar_config_release();
00652       return NULL;
00653    }
00654 
00655    if (ast_string_field_init(pvt, 32)) {
00656       ast_log(LOG_ERROR, "Couldn't allocate string field space for calendar: %s\n", cal->name);
00657       pvt = unref_exchangecal(pvt);
00658       ao2_unlock(cal);
00659       ast_calendar_config_release();
00660       return NULL;
00661    }
00662 
00663    for (v = ast_variable_browse(cfg, cal->name); v; v = v->next) {
00664       if (!strcasecmp(v->name, "url")) {
00665          ast_string_field_set(pvt, url, v->value);
00666       } else if (!strcasecmp(v->name, "user")) {
00667          ast_string_field_set(pvt, user, v->value);
00668       } else if (!strcasecmp(v->name, "secret")) {
00669          ast_string_field_set(pvt, secret, v->value);
00670       }
00671    }
00672 
00673    ast_calendar_config_release();
00674 
00675    if (ast_strlen_zero(pvt->url)) {
00676       ast_log(LOG_WARNING, "No URL was specified for Exchange calendar '%s' - skipping.\n", cal->name);
00677       pvt = unref_exchangecal(pvt);
00678       ao2_unlock(cal);
00679       return NULL;
00680    }
00681 
00682    if (ne_uri_parse(pvt->url, &pvt->uri) || pvt->uri.host == NULL || pvt->uri.path == NULL) {
00683       ast_log(LOG_WARNING, "Could not parse url '%s' for Exchange calendar '%s' - skipping.\n", pvt->url, cal->name);
00684       pvt = unref_exchangecal(pvt);
00685       ao2_unlock(cal);
00686       return NULL;
00687    }
00688 
00689    if (pvt->uri.scheme == NULL) {
00690       pvt->uri.scheme = "http";
00691    }
00692 
00693    if (pvt->uri.port == 0) {
00694       pvt->uri.port = ne_uri_defaultport(pvt->uri.scheme);
00695    }
00696 
00697    pvt->session = ne_session_create(pvt->uri.scheme, pvt->uri.host, pvt->uri.port);
00698    ne_redirect_register(pvt->session);
00699    ne_set_server_auth(pvt->session, auth_credentials, pvt);
00700    if (!strcasecmp(pvt->uri.scheme, "https")) {
00701       ne_ssl_trust_default_ca(pvt->session);
00702    }
00703 
00704    cal->tech_pvt = pvt;
00705 
00706    ast_mutex_init(&refreshlock);
00707 
00708    /* Load it the first time */
00709    update_exchangecal(pvt);
00710 
00711    ao2_unlock(cal);
00712 
00713    /* The only writing from another thread will be if unload is true */
00714    for (;;) {
00715       struct timeval tv = ast_tvnow();
00716       struct timespec ts = {0,};
00717 
00718       ts.tv_sec = tv.tv_sec + (60 * pvt->owner->refresh);
00719 
00720       ast_mutex_lock(&refreshlock);
00721       while (!pvt->owner->unloading) {
00722          if (ast_cond_timedwait(&pvt->owner->unload, &refreshlock, &ts) == ETIMEDOUT) {
00723             break;
00724          }
00725       }
00726       ast_mutex_unlock(&refreshlock);
00727 
00728       if (pvt->owner->unloading) {
00729          ast_debug(10, "Skipping refresh since we got a shutdown signal\n");
00730          return NULL;
00731       }
00732 
00733       ast_debug(10, "Refreshing after %d minute timeout\n", pvt->owner->refresh);
00734 
00735       update_exchangecal(pvt);
00736    }
00737 
00738    return NULL;
00739 }
00740 
00741 static int load_module(void)
00742 {
00743    ne_sock_init();
00744    if (ast_calendar_register(&exchangecal_tech)) {
00745       ne_sock_exit();
00746       return AST_MODULE_LOAD_DECLINE;
00747    }
00748 
00749    return AST_MODULE_LOAD_SUCCESS;
00750 }
00751 
00752 static int unload_module(void)
00753 {
00754    ast_calendar_unregister(&exchangecal_tech);
00755    ne_sock_exit();
00756    return 0;
00757 }
00758 
00759 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Asterisk MS Exchange Calendar Integration",
00760       .load = load_module,
00761       .unload = unload_module,
00762       .load_pri = AST_MODPRI_DEVSTATE_PLUGIN,
00763    );

Generated on Mon Jun 27 16:50:55 2011 for Asterisk - The Open Source Telephony Project by  doxygen 1.4.7