asterisk/res/res_calendar_icalendar.c

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2023-05-25 18:45:57 +00:00
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2008 - 2009, Digium, Inc.
*
* Terry Wilson <twilson@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*! \file
* \brief Resource for handling iCalendar calendars
*/
/*** MODULEINFO
<depend>res_calendar</depend>
<depend>neon</depend>
<depend>ical</depend>
<support_level>extended</support_level>
***/
#include "asterisk.h"
#include <libical/ical.h>
#include <ne_session.h>
#include <ne_uri.h>
#include <ne_request.h>
#include <ne_auth.h>
#include <ne_redirect.h>
#include "asterisk/module.h"
#include "asterisk/channel.h"
#include "asterisk/calendar.h"
#include "asterisk/lock.h"
#include "asterisk/config.h"
#include "asterisk/astobj2.h"
static void *ical_load_calendar(void *data);
static void *unref_icalendar(void *obj);
static struct ast_calendar_tech ical_tech = {
.type = "ical",
.module = AST_MODULE,
.description = "iCalendar .ics calendars",
.load_calendar = ical_load_calendar,
.unref_calendar = unref_icalendar,
};
struct icalendar_pvt {
AST_DECLARE_STRING_FIELDS(
AST_STRING_FIELD(url);
AST_STRING_FIELD(user);
AST_STRING_FIELD(secret);
);
struct ast_calendar *owner;
ne_uri uri;
ne_session *session;
icalcomponent *data;
struct ao2_container *events;
};
static void icalendar_destructor(void *obj)
{
struct icalendar_pvt *pvt = obj;
ast_debug(1, "Destroying pvt for iCalendar %s\n", pvt->owner->name);
if (pvt->session) {
ne_session_destroy(pvt->session);
}
if (pvt->data) {
icalcomponent_free(pvt->data);
}
ne_uri_free(&pvt->uri);
ast_string_field_free_memory(pvt);
ao2_callback(pvt->events, OBJ_UNLINK | OBJ_NODATA | OBJ_MULTIPLE, NULL, NULL);
ao2_ref(pvt->events, -1);
}
static void *unref_icalendar(void *obj)
{
struct icalendar_pvt *pvt = obj;
ao2_ref(pvt, -1);
return NULL;
}
static int fetch_response_reader(void *data, const char *block, size_t len)
{
struct ast_str **response = data;
unsigned char *tmp;
if (!(tmp = ast_malloc(len + 1))) {
return -1;
}
memcpy(tmp, block, len);
tmp[len] = '\0';
ast_str_append(response, 0, "%s", tmp);
ast_free(tmp);
return 0;
}
static int auth_credentials(void *userdata, const char *realm, int attempts, char *username, char *secret)
{
struct icalendar_pvt *pvt = userdata;
if (attempts > 1) {
ast_log(LOG_WARNING, "Invalid username or password for iCalendar '%s'\n", pvt->owner->name);
return -1;
}
ne_strnzcpy(username, pvt->user, NE_ABUFSIZ);
ne_strnzcpy(secret, pvt->secret, NE_ABUFSIZ);
return 0;
}
static icalcomponent *fetch_icalendar(struct icalendar_pvt *pvt)
{
int ret;
struct ast_str *response;
ne_request *req;
icalcomponent *comp = NULL;
if (!pvt) {
ast_log(LOG_ERROR, "There is no private!\n");
return NULL;
}
if (!(response = ast_str_create(512))) {
ast_log(LOG_ERROR, "Could not allocate memory for response.\n");
return NULL;
}
req = ne_request_create(pvt->session, "GET", pvt->uri.path);
ne_add_response_body_reader(req, ne_accept_2xx, fetch_response_reader, &response);
ret = ne_request_dispatch(req);
ne_request_destroy(req);
if (ret != NE_OK || !ast_str_strlen(response)) {
ast_log(LOG_WARNING, "Unable to retrieve iCalendar '%s' from '%s': %s\n", pvt->owner->name, pvt->url, ne_get_error(pvt->session));
ast_free(response);
return NULL;
}
if (!ast_strlen_zero(ast_str_buffer(response))) {
comp = icalparser_parse_string(ast_str_buffer(response));
}
ast_free(response);
return comp;
}
static time_t icalfloat_to_timet(icaltimetype time)
{
struct ast_tm tm = {0,};
struct timeval tv;
tm.tm_mday = time.day;
tm.tm_mon = time.month - 1;
tm.tm_year = time.year - 1900;
tm.tm_hour = time.hour;
tm.tm_min = time.minute;
tm.tm_sec = time.second;
tm.tm_isdst = -1;
tv = ast_mktime(&tm, NULL);
return tv.tv_sec;
}
/* span->start & span->end may be dates or floating times which have no timezone,
* which would mean that they should apply to the local timezone for all recipients.
* For example, if a meeting was set for 1PM-2PM floating time, people in different time
* zones would not be scheduled at the same local times. Dates are often treated as
* floating times, so all day events will need to be converted--so we can trust the
* span here, and instead will grab the start and end from the component, which will
* allow us to test for floating times or dates.
*/
static void icalendar_add_event(icalcomponent *comp, struct icaltime_span *span, void *data)
{
struct icalendar_pvt *pvt = data;
struct ast_calendar_event *event;
icaltimezone *utc = icaltimezone_get_utc_timezone();
icaltimetype start, end, tmp;
icalcomponent *valarm;
icalproperty *prop;
struct icaltriggertype trigger;
if (!(pvt && pvt->owner)) {
ast_log(LOG_ERROR, "Require a private structure with an owner\n");
return;
}
if (!(event = ast_calendar_event_alloc(pvt->owner))) {
ast_log(LOG_ERROR, "Could not allocate an event!\n");
return;
}
start = icalcomponent_get_dtstart(comp);
end = icalcomponent_get_dtend(comp);
event->start = icaltime_get_tzid(start) ? span->start : icalfloat_to_timet(start);
event->end = icaltime_get_tzid(end) ? span->end : icalfloat_to_timet(end);
event->busy_state = span->is_busy ? AST_CALENDAR_BS_BUSY : AST_CALENDAR_BS_FREE;
if ((prop = icalcomponent_get_first_property(comp, ICAL_SUMMARY_PROPERTY))) {
ast_string_field_set(event, summary, icalproperty_get_value_as_string(prop));
}
if ((prop = icalcomponent_get_first_property(comp, ICAL_DESCRIPTION_PROPERTY))) {
ast_string_field_set(event, description, icalproperty_get_value_as_string(prop));
}
if ((prop = icalcomponent_get_first_property(comp, ICAL_ORGANIZER_PROPERTY))) {
ast_string_field_set(event, organizer, icalproperty_get_value_as_string(prop));
}
if ((prop = icalcomponent_get_first_property(comp, ICAL_LOCATION_PROPERTY))) {
ast_string_field_set(event, location, icalproperty_get_value_as_string(prop));
}
if ((prop = icalcomponent_get_first_property(comp, ICAL_CATEGORIES_PROPERTY))) {
ast_string_field_set(event, categories, icalproperty_get_value_as_string(prop));
}
if ((prop = icalcomponent_get_first_property(comp, ICAL_PRIORITY_PROPERTY))) {
event->priority = icalvalue_get_integer(icalproperty_get_value(prop));
}
if ((prop = icalcomponent_get_first_property(comp, ICAL_UID_PROPERTY))) {
ast_string_field_set(event, uid, icalproperty_get_value_as_string(prop));
} else {
ast_log(LOG_WARNING, "No UID found, but one is required. Generating, but updates may not be accurate\n");
if (!ast_strlen_zero(event->summary)) {
ast_string_field_set(event, uid, event->summary);
} else {
char tmp[AST_TIME_T_LEN];
ast_time_t_to_string(event->start, tmp, sizeof(tmp));
ast_string_field_set(event, uid, tmp);
}
}
/*
* If comp has an RRULE and/or RDATE property, we need to check whether
* another vevent component supercedes this span. Such a component would
* have two characteristics:
* - its UID is the same as comp
* - its RECURRENCE-ID property is the same time as span->start
*/
if (icalcomponent_get_first_property(comp, ICAL_RRULE_PROPERTY)
|| icalcomponent_get_first_property(comp, ICAL_RDATE_PROPERTY)) {
icalcompiter comp_iter;
icaltimetype span_start = icaltime_from_timet_with_zone(
event->start, icaltime_is_date(start), icaltime_get_timezone(start));
icaltime_set_timezone(&span_start, icaltime_get_timezone(start));
for (comp_iter = icalcomponent_begin_component(pvt->data, ICAL_VEVENT_COMPONENT);
icalcompiter_deref(&comp_iter);
icalcompiter_next(&comp_iter)) {
icalcomponent *vevent = icalcompiter_deref(&comp_iter);
icalproperty *uid = icalcomponent_get_first_property(vevent, ICAL_UID_PROPERTY);
if (uid && !strcmp(icalproperty_get_value_as_string(uid), event->uid)) {
icaltimetype recurrence_id = icalcomponent_get_recurrenceid(vevent);
/* Set the same timezone that we want to compare against */
icaltime_set_timezone(&recurrence_id, icaltime_get_timezone(start));
if (!icaltime_compare(recurrence_id, span_start)
&& icaltime_is_date(span_start) == icaltime_is_date(recurrence_id)) {
event = ast_calendar_unref_event(event);
return;
}
}
}
}
/* Get the attendees */
for (prop = icalcomponent_get_first_property(comp, ICAL_ATTENDEE_PROPERTY);
prop; prop = icalcomponent_get_next_property(comp, ICAL_ATTENDEE_PROPERTY)) {
struct ast_calendar_attendee *attendee;
const char *data;
if (!(attendee = ast_calloc(1, sizeof(*attendee)))) {
event = ast_calendar_unref_event(event);
return;
}
data = icalproperty_get_attendee(prop);
if (ast_strlen_zero(data)) {
ast_free(attendee);
continue;
}
attendee->data = ast_strdup(data);;
AST_LIST_INSERT_TAIL(&event->attendees, attendee, next);
}
/* Only set values for alarm based on VALARM. Can be overriden in main/calendar.c by autoreminder
* therefore, go ahead and add events even if their is no VALARM or it is malformed
* Currently we are only getting the first VALARM and are handling repitition in main/calendar.c from calendar.conf */
if (!(valarm = icalcomponent_get_first_component(comp, ICAL_VALARM_COMPONENT))) {
ao2_link(pvt->events, event);
event = ast_calendar_unref_event(event);
return;
}
if (!(prop = icalcomponent_get_first_property(valarm, ICAL_TRIGGER_PROPERTY))) {
ast_log(LOG_WARNING, "VALARM has no TRIGGER, skipping!\n");
ao2_link(pvt->events, event);
event = ast_calendar_unref_event(event);
return;
}
trigger = icalproperty_get_trigger(prop);
if (icaltriggertype_is_null_trigger(trigger)) {
ast_log(LOG_WARNING, "Bad TRIGGER for VALARM, skipping!\n");
ao2_link(pvt->events, event);
event = ast_calendar_unref_event(event);
return;
}
if (!icaltime_is_null_time(trigger.time)) { /* This is an absolute time */
tmp = icaltime_convert_to_zone(trigger.time, utc);
event->alarm = icaltime_as_timet_with_zone(tmp, utc);
} else { /* Offset from either dtstart or dtend */
/* XXX Technically you can check RELATED to see if the event fires from the END of the event
* But, I'm not sure I've ever seen anyone implement it in calendaring software, so I'm ignoring for now */
tmp = icaltime_add(start, trigger.duration);
event->alarm = icaltime_as_timet_with_zone(tmp, icaltime_get_timezone(start));
}
ao2_link(pvt->events, event);
event = ast_calendar_unref_event(event);
return;
}
static void icalendar_update_events(struct icalendar_pvt *pvt)
{
struct icaltimetype start_time, end_time;
icalcomponent *iter;
if (!pvt) {
ast_log(LOG_ERROR, "iCalendar is NULL\n");
return;
}
if (!pvt->owner) {
ast_log(LOG_ERROR, "iCalendar is an orphan!\n");
return;
}
if (!pvt->data) {
ast_log(LOG_ERROR, "The iCalendar has not been parsed!\n");
return;
}
start_time = icaltime_current_time_with_zone(icaltimezone_get_utc_timezone());
end_time = icaltime_current_time_with_zone(icaltimezone_get_utc_timezone());
end_time.second += pvt->owner->timeframe * 60;
end_time = icaltime_normalize(end_time);
for (iter = icalcomponent_get_first_component(pvt->data, ICAL_VEVENT_COMPONENT);
iter;
iter = icalcomponent_get_next_component(pvt->data, ICAL_VEVENT_COMPONENT))
{
icalcomponent_foreach_recurrence(iter, start_time, end_time, icalendar_add_event, pvt);
}
ast_calendar_merge_events(pvt->owner, pvt->events);
}
static void *ical_load_calendar(void *void_data)
{
struct icalendar_pvt *pvt;
const struct ast_config *cfg;
struct ast_variable *v;
struct ast_calendar *cal = void_data;
ast_mutex_t refreshlock;
if (!(cal && (cfg = ast_calendar_config_acquire()))) {
ast_log(LOG_ERROR, "You must enable calendar support for res_icalendar to load\n");
return NULL;
}
if (ao2_trylock(cal)) {
if (cal->unloading) {
ast_log(LOG_WARNING, "Unloading module, load_calendar cancelled.\n");
} else {
ast_log(LOG_WARNING, "Could not lock calendar, aborting!\n");
}
ast_calendar_config_release();
return NULL;
}
if (!(pvt = ao2_alloc(sizeof(*pvt), icalendar_destructor))) {
ast_log(LOG_ERROR, "Could not allocate icalendar_pvt structure for calendar: %s\n", cal->name);
ast_calendar_config_release();
return NULL;
}
pvt->owner = cal;
if (!(pvt->events = ast_calendar_event_container_alloc())) {
ast_log(LOG_ERROR, "Could not allocate space for fetching events for calendar: %s\n", cal->name);
pvt = unref_icalendar(pvt);
ao2_unlock(cal);
ast_calendar_config_release();
return NULL;
}
if (ast_string_field_init(pvt, 32)) {
ast_log(LOG_ERROR, "Couldn't allocate string field space for calendar: %s\n", cal->name);
pvt = unref_icalendar(pvt);
ao2_unlock(cal);
ast_calendar_config_release();
return NULL;
}
for (v = ast_variable_browse(cfg, cal->name); v; v = v->next) {
if (!strcasecmp(v->name, "url")) {
ast_string_field_set(pvt, url, v->value);
} else if (!strcasecmp(v->name, "user")) {
ast_string_field_set(pvt, user, v->value);
} else if (!strcasecmp(v->name, "secret")) {
ast_string_field_set(pvt, secret, v->value);
}
}
ast_calendar_config_release();
if (ast_strlen_zero(pvt->url)) {
ast_log(LOG_WARNING, "No URL was specified for iCalendar '%s' - skipping.\n", cal->name);
pvt = unref_icalendar(pvt);
ao2_unlock(cal);
return NULL;
}
if (ne_uri_parse(pvt->url, &pvt->uri) || pvt->uri.host == NULL || pvt->uri.path == NULL) {
ast_log(LOG_WARNING, "Could not parse url '%s' for iCalendar '%s' - skipping.\n", pvt->url, cal->name);
pvt = unref_icalendar(pvt);
ao2_unlock(cal);
return NULL;
}
if (pvt->uri.scheme == NULL) {
pvt->uri.scheme = "http";
}
if (pvt->uri.port == 0) {
pvt->uri.port = ne_uri_defaultport(pvt->uri.scheme);
}
pvt->session = ne_session_create(pvt->uri.scheme, pvt->uri.host, pvt->uri.port);
ne_redirect_register(pvt->session);
ne_set_server_auth(pvt->session, auth_credentials, pvt);
ne_set_useragent(pvt->session, "Asterisk");
if (!strcasecmp(pvt->uri.scheme, "https")) {
ne_ssl_trust_default_ca(pvt->session);
}
cal->tech_pvt = pvt;
ast_mutex_init(&refreshlock);
/* Load it the first time */
if (!(pvt->data = fetch_icalendar(pvt))) {
ast_log(LOG_WARNING, "Unable to parse iCalendar '%s'\n", cal->name);
}
icalendar_update_events(pvt);
ao2_unlock(cal);
/* The only writing from another thread will be if unload is true */
for(;;) {
struct timeval tv = ast_tvnow();
struct timespec ts = {0,};
ts.tv_sec = tv.tv_sec + (60 * pvt->owner->refresh);
ast_mutex_lock(&refreshlock);
while (!pvt->owner->unloading) {
if (ast_cond_timedwait(&pvt->owner->unload, &refreshlock, &ts) == ETIMEDOUT) {
break;
}
}
ast_mutex_unlock(&refreshlock);
if (pvt->owner->unloading) {
ast_debug(10, "Skipping refresh since we got a shutdown signal\n");
return NULL;
}
ast_debug(10, "Refreshing after %d minute timeout\n", pvt->owner->refresh);
/* Free the old calendar data */
if (pvt->data) {
icalcomponent_free(pvt->data);
pvt->data = NULL;
}
if (!(pvt->data = fetch_icalendar(pvt))) {
ast_log(LOG_WARNING, "Unable to parse iCalendar '%s'\n", pvt->owner->name);
continue;
}
icalendar_update_events(pvt);
}
return NULL;
}
static int load_module(void)
{
ne_sock_init();
if (ast_calendar_register(&ical_tech)) {
ne_sock_exit();
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
static int unload_module(void)
{
ast_calendar_unregister(&ical_tech);
ne_sock_exit();
return 0;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Asterisk iCalendar .ics file integration",
.support_level = AST_MODULE_SUPPORT_EXTENDED,
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_DEVSTATE_PLUGIN,
.requires = "res_calendar",
);