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<?php
/**
* A script for returning a feed (currently Atom) of recent changes to a calendar collection
*
* @package davical
* @subpackage feed
* @author Leho Kraav <leho@kraav.com>
* @author Andrew McMillan <andrew@morphoss.com>
* @license GPL v2 or later
*/
require_once("./always.php");
dbg_error_log( "feed", " User agent: %s", ((isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "Unfortunately Mulberry and Chandler don't send a 'User-agent' header with their requests :-(")) );
dbg_log_array( "headers", '_SERVER', $_SERVER, true );
require_once('AwlCache.php');
require_once("HTTPAuthSession.php");
$session = new HTTPAuthSession();
require_once('CalDAVRequest.php');
$request = new CalDAVRequest();
require_once("vComponent.php");
require_once("DAVResource.php");
/**
* Function for creating anchor links out of plain text.
* Source: http://stackoverflow.com/questions/1960461/convert-plain-text-hyperlinks-into-html-hyperlinks-in-php
*/
function hyperlink( $text ) {
return preg_replace( '@(https?://([-\w\.]+[-\w])+(:\d+)?(/([\w/_\.#-]*(\?\S+)?[^\.\s])?)?)@', '<a href="$1" target="_blank">$1</a>', htmlspecialchars($text) );
}
function caldav_get_feed( $request, $collection ) {
global $c, $session;
dbg_error_log("feed", "GET method handler");
$collection->NeedPrivilege( array('DAV::read') );
if ( ! $collection->Exists() ) {
$request->DoResponse( 404, translate("Resource Not Found.") );
}
if ( !$collection->IsCollection()
|| !$collection->IsCalendar() && !(isset($c->get_includes_subcollections) && $c->get_includes_subcollections) ) {
$request->DoResponse( 405, translate("Feeds are only supported for calendars at present.") );
}
// Try and pull the answer out of a hat
$cache = getCacheInstance();
$cache_ns = 'collection-'.$collection->dav_name();
$cache_key = 'feed'.$session->user_no;
$response = $cache->get( $cache_ns, $cache_key );
if ( $response !== false ) return $response;
$principal = $collection->GetProperty('principal');
/**
* The CalDAV specification does not define GET on a collection, but typically this is
* used as a .ics download for the whole collection, which is what we do also.
*/
$sql = 'SELECT caldav_data, caldav_type, caldav_data.user_no, caldav_data.dav_name,';
$sql .= ' caldav_data.modified, caldav_data.created, ';
$sql .= ' summary, dtstart, dtend, calendar_item.description ';
$sql .= ' FROM collection INNER JOIN caldav_data USING(collection_id) INNER JOIN calendar_item USING ( dav_id ) WHERE ';
if ( isset($c->get_includes_subcollections) && $c->get_includes_subcollections ) {
$sql .= ' (collection.dav_name ~ :path_match ';
$sql .= ' OR collection.collection_id IN (SELECT bound_source_id FROM dav_binding WHERE dav_binding.dav_name ~ :path_match)) ';
$params = array( ':path_match' => '^'.$request->path );
}
else {
$sql .= ' caldav_data.collection_id = :collection_id ';
$params = array( ':collection_id' => $collection->resource_id() );
}
$sql .= ' ORDER BY caldav_data.created DESC';
$sql .= ' LIMIT '.(isset($c->feed_item_limit) ? $c->feed_item_limit : 15);
$qry = new AwlQuery( $sql, $params );
if ( !$qry->Exec("GET",__LINE__,__FILE__) ) {
$request->DoResponse( 500, translate("Database Error") );
}
/**
* Here we are constructing the feed response for this collection, including
* the timezones that are referred to by the events we have selected.
* Library used: http://framework.zend.com/manual/en/zend.feed.writer.html
*/
require_once('AtomFeed.php');
$feed = new AtomFeed();
$feed->setTitle('DAViCal Atom Feed: '. $collection->GetProperty('displayname'));
$url = $c->protocol_server_port . $collection->url();
$url = preg_replace( '{/$}', '.ics', $url);
$feed->setLink($url);
$feed->setFeedLink($c->protocol_server_port_script . $request->path, 'atom');
$feed->addAuthor(array(
'name' => $principal->GetProperty('displayname'),
'email' => $principal->GetProperty('email'),
'uri' => $c->protocol_server_port . $principal->url(),
));
$feed_description = $collection->GetProperty('description');
if ( isset($feed_description) && $feed_description != '' ) $feed->setDescription($feed_description);
require_once('RRule.php');
$need_zones = array();
$timezones = array();
while( $event = $qry->Fetch() ) {
if ( $event->caldav_type != 'VEVENT' && $event->caldav_type != 'VTODO' && $event->caldav_type != 'VJOURNAL') {
dbg_error_log( 'feed', 'Skipping peculiar "%s" component in VCALENDAR', $event->caldav_type );
continue;
}
$is_todo = ($event->caldav_type == 'VTODO');
$ical = new vComponent( $event->caldav_data );
$event_data = $ical->GetComponents('VTIMEZONE', false);
$item = $feed->createEntry();
$item->setId( $c->protocol_server_port_script . ConstructURL($event->dav_name) );
$dt_created = new RepeatRuleDateTime( $event->created );
$item->setDateCreated( $dt_created->epoch() );
$dt_modified = new RepeatRuleDateTime( $event->modified );
$item->setDateModified( $dt_modified->epoch() );
$summary = $event->summary;
$p_title = ($summary != '' ? $summary : translate('No summary'));
if ( $is_todo ) $p_title = "TODO: " . $p_title;
$item->setTitle($p_title);
$content = "";
$dt_start = new RepeatRuleDateTime($event->dtstart);
if ( $dt_start != null ) {
$p_time = '<strong>' . translate('Time') . ':</strong> ' . strftime(translate('%F %T'), $dt_start->epoch());
$dt_end = new RepeatRuleDateTime($event->dtend);
if ( $dt_end != null ) {
$p_time .= ' - ' . ( $dt_end->AsDate() == $dt_start->AsDate()
# Translators: his is the formatting of just the time. See http://php.net/manual/en/function.strftime.php
? strftime(translate('%T'), $dt_end->epoch())
# Translators: this is the formatting of a date with time. See http://php.net/manual/en/function.strftime.php
: strftime(translate('%F %T'), $dt_end->epoch())
);
}
$content .= $p_time;
}
$p_location = $event_data[0]->GetProperty('LOCATION');
if ( $p_location != null )
$content .= '<br />'
.'<strong>' . translate('Location') . '</strong>: ' . hyperlink($p_location->Value());
$p_attach = $event_data[0]->GetProperty('ATTACH');
if ( $p_attach != null )
$content .= '<br />'
.'<strong>' . translate('Attachment') . '</strong>: ' . hyperlink($p_attach->Value());
$p_url = $event_data[0]->GetProperty('URL');
if ( $p_url != null )
$content .= '<br />'
.'<strong>' . translate('URL') . '</strong>: ' . hyperlink($p_url->Value());
$p_cat = $event_data[0]->GetProperty('CATEGORIES');
if ( $p_cat != null ) {
$content .= '<br />' .'<strong>' . translate('Categories') . '</strong>: ' . $p_cat->Value();
$categories = explode(',',$p_cat->Value());
foreach( $categories AS $category ) {
$item->addCategory( array('term' => trim($category)) );
}
}
$p_description = $event->description;
if ( $p_description != '' ) {
$content .= '<br />'
.'<br />'
.'<strong>' . translate('Description') . '</strong>:<br />' . ( nl2br(hyperlink($p_description)) )
;
$item->setDescription($p_description);
}
$item->setContent($content);
$feed->addEntry($item);
//break;
}
$last_modified = new RepeatRuleDateTime($collection->GetProperty('modified'));
$feed->setDateModified($last_modified->epoch());
$response = $feed->export('atom');
$cache->set( $cache_ns, $cache_key, $response );
return $response;
}
if ( $request->method == 'GET' ) {
$collection = new DAVResource($request->path);
$response = caldav_get_feed( $request, $collection );
header( 'Content-Length: '.strlen($response) );
header( 'Etag: '.$collection->unique_tag() );
$request->DoResponse( 200, ($request->method == 'HEAD' ? '' : $response), 'text/xml; charset="utf-8"' );
}
else {
dbg_error_log( 'feed', 'Unhandled request method >>%s<<', $request->method );
dbg_log_array( 'feed', '_SERVER', $_SERVER, true );
dbg_error_log( 'feed', 'RAW: %s', str_replace("\n", '',str_replace("\r", '', $request->raw_post)) );
}
$request->DoResponse( 500, translate('The application program does not understand that request.') );
/* vim: set ts=2 sw=2 tw=0 :*/
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