<?php
/**
* CalDAV Server - handle PUT method
*
* @package   rscds
* @subpackage   caldav
* @author    Andrew McMillan <andrew@catalyst.net.nz>
* @copyright Catalyst .Net Ltd
* @license   http://gnu.org/copyleft/gpl.html GNU GPL v2
*/
dbg_error_log("PUT", "method handler");

if ( ! $request->AllowedTo("read") ) {
  $request->DoResponse(403);
}

if ( isset($c->dbg['ALL']) || $c->dbg['put'] ) {
  $fh = fopen('/tmp/PUT.txt','w');
  fwrite($fh,$request->raw_post);
  fclose($fh);
}

include_once('caldav-PUT-functions.php');
$is_collection = controlRequestContainer($request->username,$request->user_no, $request->path,true);

$lock_opener = $request->FailIfLocked();


if ( $is_collection  ) {
  /**
  * CalDAV does not define the result of a PUT on a collection.  We treat that
  * as an import. The code is in caldav-PUT-functions.php
  */
  import_collection($request->raw_post,$request->user_no,$request->path,true);
  $request->DoResponse( 200 );
  return;
}

$etag = md5($request->raw_post);
$ic = new iCalendar(array( 'icalendar' => $request->raw_post ));

dbg_log_array( "PUT", 'EVENT', $ic->properties['VCALENDAR'][0], true );


/**
* We read any existing object so we can check the ETag.
*/
unset($put_action_type);
$qry = new PgQuery( "SELECT * FROM caldav_data WHERE user_no=? AND dav_name=?", $request->user_no, $request->path );
if ( !$qry->Exec("PUT") || $qry->rows > 1 ) {
  $request->DoResponse( 500, translate("Error querying database.") );
}
elseif ( $qry->rows < 1 ) {
  if ( isset($request->etag_if_match) && $request->etag_if_match != '' ) {
    /**
    * RFC2068, 14.25:
    * If none of the entity tags match, or if "*" is given and no current
    * entity exists, the server MUST NOT perform the requested method, and
    * MUST return a 412 (Precondition Failed) response.
    */
    $request->DoResponse( 412, translate("Resource changed on server - not changed.") );
  }

  $put_action_type = 'INSERT';

  if ( ! $request->AllowedTo("create") ) {
    $request->DoResponse( 403, translate("You may not add entries to this calendar.") );
  }
}
elseif ( $qry->rows == 1 ) {
  $icalendar = $qry->Fetch();

  if ( ( isset($request->etag_if_match) && $request->etag_if_match != '' && $request->etag_if_match != $icalendar->dav_etag )
       || ( isset($request->etag_none_match) && $request->etag_none_match != '' && ($request->etag_none_match == $icalendar->dav_etag || $request->etag_none_match == '*') ) ) {
    /**
    * RFC2068, 14.25:
    * If none of the entity tags match, or if "*" is given and no current
    * entity exists, the server MUST NOT perform the requested method, and
    * MUST return a 412 (Precondition Failed) response.
    *
    * RFC2068, 14.26:
    * If any of the entity tags match the entity tag of the entity that
    * would have been returned in the response to a similar GET request
    * (without the If-None-Match header) on that resource, or if "*" is
    * given and any current entity exists for that resource, then the
    * server MUST NOT perform the requested method.
    */
    if ( isset($request->etag_if_match) && $request->etag_if_match != $icalendar->dav_etag ) {
      $error = translate( "Existing resource does not match 'If-Match' header - not accepted.");
    }
    if ( isset($etag_none_match) && $etag_none_match != '' && ($etag_none_match == $icalendar->dav_etag || $etag_none_match == '*') ) {
      $error = translate( "Existing resource matches 'If-None-Match' header - not accepted.");
    }
    $request->DoResponse( 412, $error );
  }

  $put_action_type = 'UPDATE';

  if ( ! $request->AllowedTo("modify") ) {
    $request->DoResponse( 403, translate("You may not modify entries on this calendar.") );
  }
}

if ( $put_action_type == 'INSERT' ) {
  $qry = new PgQuery( "INSERT INTO caldav_data ( user_no, dav_name, dav_etag, caldav_data, caldav_type, logged_user, created, modified ) VALUES( ?, ?, ?, ?, ?, ?, current_timestamp, current_timestamp )",
                         $request->user_no, $request->path, $etag, $request->raw_post, $ic->type, $session->user_no );
  $qry->Exec("PUT");
}
else {
  $qry = new PgQuery( "UPDATE caldav_data SET caldav_data=?, dav_etag=?, caldav_type=?, logged_user=?, modified=current_timestamp WHERE user_no=? AND dav_name=?",
                         $request->raw_post, $etag, $ic->type, $session->user_no, $request->user_no, $request->path );
  $qry->Exec("PUT");
}

$sql = "BEGIN;".( $ic->tz_locn == '' ? '' : "SET TIMEZONE TO ".qpg($ic->tz_locn).";" );

$dtstart = $ic->Get('DTSTART');
if ( (!isset($dtstart) || $dtstart == "") && $ic->Get('DUE') != "" ) {
  $dtstart = $ic->Get('DUE');
}

$dtend = $ic->Get('DTEND');
if ( (!isset($dtend) || "$dtend" == "") && $ic->Get('DURATION') != "" AND $dtstart != "" ) {
  $duration = preg_replace( '#[PT]#', ' ', $ic->Get('DURATION') );
  $dtend = '('.qpg($dtstart).'::timestamp with time zone + '.qpg($duration).'::interval)';
}
else {
  dbg_error_log( "PUT", " DTEND: '%s', DTSTART: '%s', DURATION: '%s'", $dtend, $dtstart, $ic->Get('DURATION') );
  $dtend = qpg($dtend);
}

$last_modified = $ic->Get("LAST-MODIFIED");
if ( !isset($last_modified) || $last_modified == '' ) {
  $last_modified = gmdate( 'Ymd\THis\Z' );
}

$dtstamp = $ic->Get("DTSTAMP");
if ( !isset($dtstamp) || $dtstamp == '' ) {
  $dtstamp = $last_modified;
}

if ( $put_action_type != 'INSERT' ) {
  $sql .= "DELETE FROM calendar_item WHERE user_no=$request->user_no AND dav_name=".qpg($request->path).";";
}
$sql .= <<<EOSQL
INSERT INTO calendar_item (user_no, dav_name, dav_etag, uid, dtstamp, dtstart, dtend, summary, location, class, transp,
                    description, rrule, tz_id, last_modified, url, priority, created, due, percent_complete, status )
                 VALUES ( ?, ?, ?, ?, ?, ?, $dtend, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?);
COMMIT;
EOSQL;

$qry = new PgQuery( $sql, $request->user_no, $request->path, $etag, $ic->Get('UID'), $dtstamp,
                          $ic->Get('DTSTART'), $ic->Get('SUMMARY'), $ic->Get('LOCATION'),
                          $ic->Get('CLASS'), $ic->Get('TRANSP'), $ic->Get('DESCRIPTION'), $ic->Get('RRULE'), $ic->Get('TZ_ID'),
                          $last_modified, $ic->Get('URL'), $ic->Get('PRIORITY'), $ic->Get('CREATED'),
                          $ic->Get('DUE'), $ic->Get('PERCENT-COMPLETE'), $ic->Get('STATUS')
                    );
$qry->Exec("PUT");
dbg_error_log( "PUT", "User: %d, ETag: %s, Path: %s", $session->user_no, $etag, $request->path);

header(sprintf('ETag: "%s"', (isset($bogus_etag) ? $bogus_etag : $etag) ) );
$request->DoResponse( ($put_action_type == 'INSERT' ? 201 : 204) );
?>