DAViCal
external-fetch.php
1<?php
13function create_external ( $path,$is_calendar,$is_addressbook )
14{
15 global $request;
16 if ( ! function_exists ( "curl_init" ) ) {
17 dbg_error_log("external", "external resource cannot be fetched without curl, please install curl");
18 $request->DoResponse( 503, translate('PHP curl support is required for external binds') );
19 return ;
20 }
21 $resourcetypes = '<DAV::collection/>';
22 if ($is_calendar) $resourcetypes .= '<urn:ietf:params:xml:ns:caldav:calendar/>';
23 $qry = new AwlQuery();
24 if ( ! $qry->QDo( 'INSERT INTO collection ( user_no, parent_container, dav_name, dav_etag, dav_displayname,
25 is_calendar, is_addressbook, resourcetypes, created )
26 VALUES( :user_no, :parent_container, :dav_name, :dav_etag, :dav_displayname,
27 :is_calendar, :is_addressbook, :resourcetypes, current_timestamp )',
28 array(
29 ':user_no' => $request->user_no,
30 ':parent_container' => '/.external/',
31 ':dav_name' => $path,
32 ':dav_etag' => md5($request->user_no. $path),
33 ':dav_displayname' => $path,
34 ':is_calendar' => ($is_calendar ? 't' : 'f'),
35 ':is_addressbook' => ($is_addressbook ? 't' : 'f'),
36 ':resourcetypes' => $resourcetypes
37 ) ) ) {
38 $request->DoResponse( 500, translate('Error writing calendar details to database.') );
39 }
40}
41
42function fetch_external ( $bind_id, $min_age, $ua_string )
43{
44 if ( ! function_exists ( "curl_init" ) ) {
45 dbg_error_log("external", "external resource cannot be fetched without curl, please install curl");
46 $request->DoResponse( 503, translate('PHP curl support is required for external binds') );
47 return ;
48 }
49 $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';
50 $params = array( ':bind_id' => $bind_id );
51 if ( strlen ( $min_age ) > 2 ) {
52 $sql .= ' AND ( collection.modified + interval :interval < NOW() OR collection.modified is NULL )';
53 $params[':interval'] = $min_age;
54 }
55 $sql .= ' ORDER BY modified DESC LIMIT 1';
56 $qry = new AwlQuery( $sql, $params );
57 if ( $qry->Exec('DAVResource') && $qry->rows() > 0 && $row = $qry->Fetch() ) {
58 $curl = curl_init ( $row->external_url );
59 curl_setopt ( $curl, CURLOPT_RETURNTRANSFER, true );
60 if ( $row->modified ) {
61 $local_ts = new DateTime($row->modified);
62 curl_setopt ( $curl, CURLOPT_HEADER, true );
63 curl_setopt ( $curl, CURLOPT_FILETIME, true );
64 curl_setopt ( $curl, CURLOPT_NOBODY, true );
65 curl_setopt ( $curl, CURLOPT_TIMEVALUE, $local_ts->format("U") );
66 curl_setopt ( $curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE );
67 if ( isset( $ua_string ) )
68 curl_setopt($curl, CURLOPT_USERAGENT, $ua_string);
69 dbg_error_log("external", "checking external resource for remote changes %s ", $row->external_url );
70 $ics = curl_exec ( $curl );
71 $info = curl_getinfo ( $curl );
72 if ( $info['http_code'] === 304 || (isset($info['filetime']) && $info['filetime'] != -1 && new DateTime("@" . $info['filetime']) <= $local_ts )) {
73 dbg_error_log("external", "external resource unchanged " . $info['filetime'] . ' < ' . $local_ts->getTimestamp() . ' (' . $info['http_code'] . ')');
74 curl_close ( $curl );
75 // BUGlet: should track server-time instead of local-time
76 $qry = new AwlQuery( 'UPDATE collection SET modified=NOW() WHERE collection_id = :cid', array ( ':cid' => $row->collection_id ) );
77 $qry->Exec('DAVResource');
78 return true;
79 }
80 dbg_error_log("external", "external resource changed, re importing" . $info['filetime'] );
81 }
82 else {
83 dbg_error_log("external", "fetching external resource for the first time %s ", $row->external_url );
84 }
85 curl_setopt ( $curl, CURLOPT_NOBODY, false );
86 curl_setopt ( $curl, CURLOPT_HEADER, false );
87 $ics = curl_exec ( $curl );
88 if ( is_string ( $ics ) && strlen ( $ics ) > 20 ) {
89 // BUGlet: should track server-time instead of local-time
90 $qry = new AwlQuery( 'UPDATE collection SET modified=NOW(), dav_etag=:etag WHERE collection_id = :cid',
91 array ( ':cid' => $row->collection_id, ':etag' => md5($ics) ) );
92 $qry->Exec('DAVResource');
93 require_once ( 'caldav-PUT-functions.php');
94 import_collection ( $ics , $row->user_no, $row->path, 'External Fetch' , false ) ;
95 return true;
96 } else {
97 if ( curl_errno($curl) ) {
98 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));
99 } else {
100 dbg_error_log('ERROR', 'external:Not importing unusual ics data: "%s"', $ics);
101 }
102 }
103 curl_close ( $curl );
104 }
105 else {
106 dbg_error_log("external", "external resource up to date or not found id(%s)", $bind_id );
107 }
108 return false;
109}
110
111function update_external ( $request )
112{
113 global $c;
114 if ( $c->external_refresh < 1 )
115 return ;
116 if ( ! function_exists ( "curl_init" ) ) {
117 dbg_error_log("external", "external resource cannot be fetched without curl, please install curl");
118 return ;
119 }
120 $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 )';
121 $qry = new AwlQuery( $sql, array ( ':dav_name' => $request->dav_name(), ':interval' => $c->external_refresh . ' minutes' ) );
122 dbg_error_log("external", "checking if external resource needs update");
123 if ( $qry->Exec('DAVResource') && $qry->rows() > 0 && $row = $qry->Fetch() ) {
124 if ( $row->bind_id != 0 ) {
125 dbg_error_log("external", "external resource needs updating, this might take a minute : %s", $row->url );
126 fetch_external ( $row->bind_id, $c->external_refresh . ' minutes', @$c->external_ua_string );
127 }
128 }
129}