Merge pull request #132 from tobiasd/cal
export events as ical or csv calendar file
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tobiasd
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Copyright (c) 2013 Tobias Diekershoff
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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Calendar Export
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===============
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This addon makes it possible to export the events posted by your users,
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so they can be imported into other calendar applications.
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Exporting a calendar is an _opt-in_ feature which has to be activated by each
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of the users in the _addon settings_. As the admin you can only provide the
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service but should not force it upon your users.
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The calendars are exported at
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http://example.com/cal/username/export/format
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currently the following formats are supported
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* ical
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* csv.
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Author
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------
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This addon is developed by [Tobias Diekershoff](https://f.diekershoff.de/profile/tobias).
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License
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-------
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This addon is licensed under the [MIT](http://opensource.org/licenses/MIT)
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license, see also the LICENSE file in the addon directory.
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<?php
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/********************************************************************
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* Name: Calendar Export
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* Description: This addon exports the public events of your users as calendar files
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* Version: 0.1
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* Author: Tobias Diekershoff <https://f.diekershoff.de/profile/tobias>
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* License: MIT
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* ******************************************************************/
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function cal_install()
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{
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register_hook('plugin_settings', 'addon/cal/cal.php', 'cal_addon_settings');
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register_hook('plugin_settings_post', 'addon/cal/cal.php', 'cal_addon_settings_post');
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}
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function cal_uninstall()
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{
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unregister_hook('plugin_settings', 'addon/cal/cal.php', 'cal_addon_settings');
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unregister_hook('plugin_settings_post', 'addon/cal/cal.php', 'cal_addon_settings_post');
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}
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function cal_module()
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{
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}
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/* pathes
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* /cal/$user/export/$format
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* currently supported formats are ical (iCalendar) and CSV
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*/
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function cal_content()
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{
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$a = get_app();
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$o = "";
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if ($a->argc == 1) {
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$o .= "<h3>".t('Event Export')."</h3><p>".t('You can download public events from: ').$a->get_baseurl()."/cal/username/export/ical</p>";
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} elseif ($a->argc==4) {
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// get the parameters from the request we just received
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$username = $a->argv[1];
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$do = $a->argv[2];
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$format = $a->argv[3];
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// check that there is a user matching the requested profile
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$r = q("SELECT uid FROM user WHERE nickname='".$username."' LIMIT 1;");
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if (count($r))
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{
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$uid = $r[0]['uid'];
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} else {
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killme();
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}
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// if we shall do anything other then export, end here
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if (! $do == 'export' )
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killme();
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// check if the user allows us to share the profile
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$enable = get_pconfig( $uid, 'cal', 'enable');
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if (! $enable == 1) {
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info(t('The user does not export the calendar.'));
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return;
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}
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// we are allowed to show events
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// get the timezone the user is in
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$r = q("SELECT timezone FROM user WHERE uid=".$uid." LIMIT 1;");
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if (count($r))
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$timezone = $r[0]['timezone'];
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// does the user who requests happen to be the owner of the events
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// requested? then show all of your events, otherwise only those that
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// don't have limitations set in allow_cid and allow_gid
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if (local_user() == $uid) {
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$r = q("SELECT `start`, `finish`, `adjust`, `summary`, `desc`, `location` FROM `event` WHERE `uid`=".$uid.";");
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} else {
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$r = q("SELECT `start`, `finish`, `adjust`, `summary`, `desc`, `location` FROM `event` WHERE `allow_cid`='' and `allow_gid`='' and `uid`='".$uid."';");
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}
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// we have the events that are available for the requestor
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// now format the output according to the requested format
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$res = cal_format_output($r, $format, $timezone);
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if (! $res=='')
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info($res);
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} else {
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// wrong number of parameters
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killme();
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}
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return $o;
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}
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function cal_format_output ($r, $f, $tz)
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{
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$res = t('This calendar format is not supported');
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switch ($f)
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{
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// format the exported data as a CSV file
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case "csv":
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header("Content-type: text/csv");
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$o = '"Subject", "Start Date", "Start Time", "Description", "End Date", "End Time", "Location"' . PHP_EOL;
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foreach ($r as $rr) {
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// TODO the time / date entries don't include any information about the
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// timezone the event is scheduled in :-/
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$tmp1 = strtotime($rr['start']);
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$tmp2 = strtotime($rr['finish']);
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$time_format = "%H:%M:%S";
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$date_format = "%Y-%m-%d";
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$o .= '"'.$rr['summary'].'", "'.strftime($date_format, $tmp1) .
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'", "'.strftime($time_format, $tmp1).'", "'.$rr['desc'] .
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'", "'.strftime($date_format, $tmp2) .
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'", "'.strftime($time_format, $tmp2) .
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'", "'.$rr['location'].'"' . PHP_EOL;
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}
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echo $o;
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killme();
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case "ical":
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header("Content-type: text/ics");
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$o = 'BEGIN:VCALENDAR'. PHP_EOL
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. 'PRODID:-//friendica calendar export//0.1//EN' . PHP_EOL
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. 'VERSION:2.0' . PHP_EOL;
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// TODO include timezone informations in cases were the time is not in UTC
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// see http://tools.ietf.org/html/rfc2445#section-4.8.3
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// . 'BEGIN:VTIMEZONE' . PHP_EOL
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// . 'TZID:' . $tz . PHP_EOL
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// . 'END:VTIMEZONE' . PHP_EOL;
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foreach ($r as $rr) {
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if ($rr['adjust'] == 1) {
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$UTC = 'Z';
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} else {
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$UTC = '';
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}
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$o .= 'BEGIN:VEVENT' . PHP_EOL;
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if ($rr[start]) {
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$tmp = strtotime($rr['start']);
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$dtformat = "%Y%m%dT%H%M%S".$UTC;
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$o .= 'DTSTART:'.strftime($dtformat, $tmp).PHP_EOL;
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}
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if ($rr['finish']) {
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$tmp = strtotime($rr['finish']);
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$dtformat = "%Y%m%dT%H%M%S".$UTC;
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$o .= 'DTEND:'.strftime($dtformat, $tmp).PHP_EOL;
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}
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if ($rr['summary'])
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$tmp = $rr['summary'];
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$tmp = str_replace(PHP_EOL, PHP_EOL.' ',$tmp);
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$o .= 'SUMMARY:' . $tmp . PHP_EOL;
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if ($rr['desc'])
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$tmp = $rr['desc'];
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$tmp = str_replace(PHP_EOL, PHP_EOL.' ',$tmp);
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$o .= 'DESCRIPTION:' . $tmp . PHP_EOL;
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if ($rr['location']) {
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$tmp = $rr['location'];
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$tmp = str_replace(PHP_EOL, PHP_EOL.' ',$tmp);
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$o .= 'LOCATION:' . $tmp . PHP_EOL;
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}
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$o .= 'END:VEVENT' . PHP_EOL;
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}
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$o .= 'END:VCALENDAR' . PHP_EOL;
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echo $o;
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killme();
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}
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return $res;
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}
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function cal_addon_settings_post ( &$a, &$b )
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{
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if (! local_user())
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return;
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if (!x($_POST,'cal-submit'))
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return;
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set_pconfig(local_user(),'cal','enable',intval($_POST['cal-enable']));
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}
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function cal_addon_settings ( &$a, &$s )
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{
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if (! local_user())
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return;
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$enabled = get_pconfig(local_user(), 'cal', 'enable');
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$checked = (($enabled) ? ' checked="checked" ' : '');
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$url = $a->get_baseurl().'/cal/'.$a->user['nickname'].'/export/<em>format</em>';
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$s .= '<h3>'.t('Export Events').'</h3>';
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$s .= '<p>'.t('If this is enabled, you public events will be available at').' <strong>'.$url.'</strong></p>';
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$s .= '<p>'.t('Currently supported formats are ical and csv.').'</p>';
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$s .= '<div id="cal-enable-wrapper">';
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$s .= '<label id="cal-enable-label" for="cal-checkbox">'. t('Enable calendar export') .'</label>';
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$s .= '<input id="cal-checkbox" type="checkbox" name="cal-enable" value="1" ' . $checked . '/>';
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$s .= '</div><div class="clear"></div>';
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$s .= '<div class="settings-submit-wrapper" ><input type="submit" name="cal-submit" class="settings-submit" value="' . t('Submit') . '" /></div>';
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$s .= '</div><div class="clear"></div>';
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}
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?>
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