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external-fetch.php
<?php
function create_external ( $path,$is_calendar,$is_addressbook )
{
global $request;
if ( ! function_exists ( "curl_init" ) ) {
dbg_error_log("external", "external resource cannot be fetched without curl, please install curl");
$request->DoResponse( 503, translate('PHP curl support is required for external binds') );
return ;
}
$resourcetypes = '<DAV::collection/>';
if ($is_calendar) $resourcetypes .= '<urn:ietf:params:xml:ns:caldav:calendar/>';
$qry = new AwlQuery();
if ( ! $qry->QDo( 'INSERT INTO collection ( user_no, parent_container, dav_name, dav_etag, dav_displayname,
is_calendar, is_addressbook, resourcetypes, created )
VALUES( :user_no, :parent_container, :dav_name, :dav_etag, :dav_displayname,
:is_calendar, :is_addressbook, :resourcetypes, current_timestamp )',
array(
':user_no' => $request->user_no,
':parent_container' => '/.external/',
':dav_name' => $path,
':dav_etag' => md5($request->user_no. $path),
':dav_displayname' => $path,
':is_calendar' => ($is_calendar ? 't' : 'f'),
':is_addressbook' => ($is_addressbook ? 't' : 'f'),
':resourcetypes' => $resourcetypes
) ) ) {
$request->DoResponse( 500, translate('Error writing calendar details to database.') );
}
}
function fetch_external ( $bind_id, $min_age, $ua_string )
{
if ( ! function_exists ( "curl_init" ) ) {
dbg_error_log("external", "external resource cannot be fetched without curl, please install curl");
$request->DoResponse( 503, translate('PHP curl support is required for external binds') );
return ;
}
$sql = 'SELECT collection.*, collection.dav_name AS path, dav_binding.external_url AS external_url FROM dav_binding LEFT JOIN collection ON (collection.collection_id=bound_source_id) WHERE bind_id = :bind_id';
$params = array( ':bind_id' => $bind_id );
if ( strlen ( $min_age ) > 2 ) {
$sql .= ' AND ( collection.modified + interval :interval < NOW() OR collection.modified is NULL )';
$params[':interval'] = $min_age;
}
$sql .= ' ORDER BY modified DESC LIMIT 1';
$qry = new AwlQuery( $sql, $params );
if ( $qry->Exec('DAVResource') && $qry->rows() > 0 && $row = $qry->Fetch() ) {
$curl = curl_init ( $row->external_url );
curl_setopt ( $curl, CURLOPT_RETURNTRANSFER, true );
if ( $row->modified ) {
$local_ts = new DateTime($row->modified);
curl_setopt ( $curl, CURLOPT_HEADER, true );
curl_setopt ( $curl, CURLOPT_FILETIME, true );
curl_setopt ( $curl, CURLOPT_NOBODY, true );
curl_setopt ( $curl, CURLOPT_TIMEVALUE, $local_ts->format("U") );
curl_setopt ( $curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE );
if ( isset( $ua_string ) )
curl_setopt($curl, CURLOPT_USERAGENT, $ua_string);
dbg_error_log("external", "checking external resource for remote changes %s ", $row->external_url );
$ics = curl_exec ( $curl );
$info = curl_getinfo ( $curl );
if ( $info['http_code'] === 304 || (isset($info['filetime']) && $info['filetime'] != -1 && new DateTime("@" . $info['filetime']) <= $local_ts )) {
dbg_error_log("external", "external resource unchanged " . $info['filetime'] . ' < ' . $local_ts->getTimestamp() . ' (' . $info['http_code'] . ')');
curl_close ( $curl );
// BUGlet: should track server-time instead of local-time
$qry = new AwlQuery( 'UPDATE collection SET modified=NOW() WHERE collection_id = :cid', array ( ':cid' => $row->collection_id ) );
$qry->Exec('DAVResource');
return true;
}
dbg_error_log("external", "external resource changed, re importing" . $info['filetime'] );
}
else {
dbg_error_log("external", "fetching external resource for the first time %s ", $row->external_url );
}
curl_setopt ( $curl, CURLOPT_NOBODY, false );
curl_setopt ( $curl, CURLOPT_HEADER, false );
$ics = curl_exec ( $curl );
if ( is_string ( $ics ) && strlen ( $ics ) > 20 ) {
// BUGlet: should track server-time instead of local-time
$qry = new AwlQuery( 'UPDATE collection SET modified=NOW(), dav_etag=:etag WHERE collection_id = :cid',
array ( ':cid' => $row->collection_id, ':etag' => md5($ics) ) );
$qry->Exec('DAVResource');
require_once ( 'caldav-PUT-functions.php');
import_collection ( $ics , $row->user_no, $row->path, 'External Fetch' , false ) ;
return true;
} else {
if ( curl_errno($curl) ) {
dbg_error_log('ERROR', 'external:Fetch of %s (%s) failed with curl error %s: %s', $row->collection_id, $row->external_url, curl_errno($curl), curl_error($curl));
} else {
dbg_error_log('ERROR', 'external:Not importing unusual ics data: "%s"', $ics);
}
}
curl_close ( $curl );
}
else {
dbg_error_log("external", "external resource up to date or not found id(%s)", $bind_id );
}
return false;
}
function update_external ( $request )
{
global $c;
if ( $c->external_refresh < 1 )
return ;
if ( ! function_exists ( "curl_init" ) ) {
dbg_error_log("external", "external resource cannot be fetched without curl, please install curl");
return ;
}
$sql = 'SELECT bind_id, external_url as url from dav_binding LEFT JOIN collection ON (collection.collection_id=bound_source_id) WHERE dav_binding.dav_name = :dav_name AND ( collection.modified + interval :interval < NOW() OR collection.modified is NULL )';
$qry = new AwlQuery( $sql, array ( ':dav_name' => $request->dav_name(), ':interval' => $c->external_refresh . ' minutes' ) );
dbg_error_log("external", "checking if external resource needs update");
if ( $qry->Exec('DAVResource') && $qry->rows() > 0 && $row = $qry->Fetch() ) {
if ( $row->bind_id != 0 ) {
dbg_error_log("external", "external resource needs updating, this might take a minute : %s", $row->url );
fetch_external ( $row->bind_id, $c->external_refresh . ' minutes', @$c->external_ua_string );
}
}
}