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egroupware/api/src/Link/Storage.php

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move egw_link to Api\Link
2016-03-07 09:46:32 +01:00
<?php
/**
* EGroupware API - Interapplicaton links storage
*
* Links have two ends each pointing to an entry, each entry is a double:
* - app app-name or directory-name of an egw application, eg. 'infolog'
* - id this is the id, eg. an integer or a tupple like '0:INBOX:1234'
*
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright 2001-2016 by RalfBecker@outdoor-training.de
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage link
* @version $Id$
*/
namespace EGroupware\Api\Link;
use EGroupware\Api;
/**
* generalized linking between entries of eGroupware apps - SO layer
*
* All vars passed to this class get correct escaped to prevent query insertion.
*
* All methods are now static!
*/
class Storage
{
/**
* Name of the links table
*/
const TABLE = 'egw_links';
/**
* Turns on debug-messages
*/
const DEBUG = false;
/**
* Reference to the global db-class
*
fix diverse occurences of egw_db
2016-05-06 13:13:19 +02:00
* @var Api\Db
move egw_link to Api\Link
2016-03-07 09:46:32 +01:00
*/
private static $db;
/**
* True if call to get_links or get_3links exceeded limit (contains not all rows)
*/
public static $limit_exceeded = false;
/**
* creats a link between $app1,$id1 and $app2,$id2
*
* @param string $app1 appname of 1. endpoint of the link
* @param string $id1 id in $app1
* @param string $app2 appname of 2. endpoint of the link
* @param string $id2 id in $app2
* @param string $remark ='' Remark to be saved with the link (defaults to '')
* @param int $owner =0 Owner of the link (defaults to user)
* @param int $lastmod =0 timestamp of last modification (defaults to now=time())
* @return int/boolean False (for db or param-error) or on success link_id (Please not the return-value of $id1)
*/
static function link( $app1,&$id1,$app2,$id2='',$remark='',$owner=0,$lastmod=0 )
{
if (self::DEBUG)
{
echo "<p>solink.link('$app1',$id1,'$app2',$id2,'$remark',$owner)</p>\n";
}
if ($app1 == $app2 && $id1 == $id2 ||
$id1 == '' || $id2 == '' || $app1 == '' || $app2 == '')
{
return False; // dont link to self or other nosense
}
if (($link = self::get_link($app1,$id1,$app2,$id2)))
{
if ($link['link_remark'] != $remark)
{
self::update_remark($link['link_id'],$remark);
}
return $link['link_id']; // link alread exist
}
if (!$owner)
{
$owner = $GLOBALS['egw_info']['user']['account_id'];
}
return self::$db->insert(self::TABLE,array(
'link_app1' => $app1,
'link_id1' => $id1,
'link_app2' => $app2,
'link_id2' => $id2,
'link_remark' => $remark,
'link_lastmod' => $lastmod ? $lastmod : time(),
'link_owner' => $owner,
),False,__LINE__,__FILE__) ? self::$db->get_last_insert_id(self::TABLE,'link_id') : false;
}
/**
* update the remark of a link
*
* @param int $link_id link to update
* @param string $remark new text for the remark
* @return boolean true on success, else false
*/
static function update_remark($link_id,$remark)
{
return self::$db->update(self::TABLE,array(
'link_remark' => $remark,
'link_lastmod' => time(),
),array(
'link_id' => $link_id,
),__LINE__,__FILE__);
}
/**
* returns array of links to $app,$id
*
* @param string $app appname
* @param string|array $id id(s) in $app
* @param string $only_app ='' if set return only links from $only_app (eg. only addressbook-entries) or NOT from if $only_app[0]=='!'
* @param string $order ='link_lastmod DESC' defaults to newest links first
* @param boolean $deleted =false Include links that have been flagged as deleted, waiting for purge of linked record.
* @param int|array $limit =null number of entries to return, default null = all or array(offset, num_rows) to return num_rows starting from offset
* @return array id => links pairs if $id is an array or just the links (only_app: ids) or empty array if no matching links found
*/
static function get_links($app, $id, $only_app='', $order='link_lastmod DESC', $deleted=false, $limit=null)
{
if (self::DEBUG)
{
echo "<p>solink.get_links($app,".print_r($id,true).",$only_app,$order,$deleted)</p>\n";
}
if (($not_only = $only_app[0] == '!'))
{
$only_app = substr($only_app,1);
}
$offset = false;
if (is_array($limit))
{
list($offset, $limit) = $limit;
}
elseif($limit)
{
$offset = 0;
}
$links = array();
try {
foreach(self::$db->select(self::TABLE, '*', self::$db->expression(self::TABLE, '((', array(
'link_app1' => $app,
'link_id1' => $id,
),') OR (',array(
'link_app2' => $app,
'link_id2' => $id,
),'))',
$deleted ? '' : ' AND deleted IS NULL'
), __LINE__, __FILE__, $offset, $order ? " ORDER BY $order" : '', 'phpgwapi', $limit) as $row)
{
// check if left side (1) is one of our targets --> add it
if ($row['link_app1'] == $app && in_array($row['link_id1'],(array)$id))
{
self::_add2links($row,true,$only_app,$not_only,$links);
}
// check if right side (2) is one of our targets --> add it (both can be true for multiple targets!)
if ($row['link_app2'] == $app && in_array($row['link_id2'],(array)$id))
{
self::_add2links($row,false,$only_app,$not_only,$links);
}
}
// if query returns exactly limit rows, we assume there are more and therefore set self::$limit_exceeded
self::$limit_exceeded = $offset !== false && count(is_array($id) ? $links : $links[$id]) == $limit;
}
// catch Illegal mix of collations (ascii_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (1267)
// caused by non-ascii chars compared with ascii field uid
catch(Api\Db\Exception $e) {
_egw_log_exception($e);
}
return is_array($id) ? $links : ($links[$id] ? $links[$id] : array());
}
private static function _add2links($row,$left,$only_app,$not_only,array &$links)
{
$linked_app = $left ? $row['link_app2'] : $row['link_app1'];
$linked_id = $left ? $row['link_id2'] : $row['link_id1'];
$app_id = $left ? $row['link_id1'] : $row['link_id2'];
list($app) = explode('-',$linked_app);
if ($only_app && $not_only == ($linked_app == $only_app) || !$GLOBALS['egw_info']['user']['apps'][$app])
{
#echo "$linked_app == $only_app, ";var_dump($linked_app == $only_app);echo " ->dont return a link<br>";
return;
}
#echo "returning ".(($only_app && !$not_only) ? " linkid:".$linked_id : " full array with linkid $linked_id")."<br>";
$links[$app_id][$row['link_id']] = ($only_app && !$not_only) ? $linked_id : array(
'app' => $linked_app,
'id' => $linked_id,
'remark' => $row['link_remark'],
'owner' => $row['link_owner'],
'lastmod' => $row['link_lastmod'],
'link_id' => $row['link_id'],
'deleted' => $row['deleted'],
);
}
/**
* returns data of a link
*
* @param ing/string $app_link_id > 0 link_id of link or app-name of link
* @param string $id ='' id in $app, if no integer link_id given in $app_link_id
* @param string $app2 ='' appname of 2. endpoint of the link, if no integer link_id given in $app_link_id
* @param string $id2 ='' id in $app2, if no integer link_id given in $app_link_id
* @return array with link-data or False
*/
static function get_link($app_link_id,$id='',$app2='',$id2='')
{
if (self::DEBUG)
{
echo "<p>solink.get_link('$app_link_id',$id,'$app2','$id2')</p>\n";
}
if ((int) $app_link_id > 0)
{
$where = array('link_id' => $app_link_id);
}
else
{
if ($app_link_id == '' || $id == '' || $app2 == '' || $id2 == '')
{
return False;
}
$where = self::$db->expression(self::TABLE,'(',array(
'link_app1' => $app_link_id,
'link_id1' => $id,
'link_app2' => $app2,
'link_id2' => $id2,
),') OR (',array(
'link_app2' => $app_link_id,
'link_id2' => $id,
'link_app1' => $app2,
'link_id1' => $id2,
),')');
}
try {
return self::$db->select(self::TABLE,'*',$where,__LINE__,__FILE__)->fetch(ADODB_FETCH_ASSOC);
}
// catch Illegal mix of collations (ascii_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (1267)
// caused by non-ascii chars compared with ascii field uid
catch(Api\Db\Exception $e) {
_egw_log_exception($e);
}
return false;
}
/**
* Remove link with $link_id or all links matching given params
*
* @param $link_id link-id to remove if > 0
* @param string $app ='' app-name of links to remove
* @param string $id ='' id in $app or '' remove all links from $app
* @param int $owner =0 account_id to delete all links of a given owner, or 0
* @param string $app2 ='' appname of 2. endpoint of the link
* @param string $id2 ='' id in $app2
* @param boolean $hold_for_purge Don't really delete the link, just mark it as deleted and wait for final delete of linked entry
* @return array with deleted links
*/
static function unlink($link_id,$app='',$id='',$owner=0,$app2='',$id2='',$hold_for_purge=false)
{
if (self::DEBUG)
{
echo "<p>solink.unlink($link_id,$app,$id,$owner,$app2,$id2)</p>\n";
}
if ((int)$link_id > 0)
{
$where = array('link_id' => $link_id);
}
elseif ($app == '' AND $owner == '')
{
return 0;
}
else
{
if ($app != '' && $app2 == '')
{
$check1 = array('link_app1' => $app);
$check2 = array('link_app2' => $app);
if ($id != '')
{
$check1['link_id1'] = $id;
$check2['link_id2'] = $id;
}
$where = self::$db->expression(self::TABLE,'((',$check1,') OR (',$check2,'))');
}
elseif ($app != '' && $app2 != '')
{
$where = self::$db->expression(self::TABLE,'(',array(
'link_app1' => $app,
'link_id1' => $id,
'link_app2' => $app2,
'link_id2' => $id2,
),') OR (',array(
'link_app1' => $app2,
'link_id1' => $id2,
'link_app2' => $app,
'link_id2' => $id,
),')');
}
if ($owner)
{
if ($app) $where = array($where);
$where['link_owner'] = $owner;
}
}
$deleted = array();
try {
foreach(self::$db->select(self::TABLE,'*',$where,__LINE__,__FILE__) as $row)
{
$deleted[] = $row;
}
if($hold_for_purge)
{
self::$db->update(self::TABLE,array(
'deleted' => time(),
'link_lastmod' => time(),
), $where, __LINE__,__FILE__);
}
else
{
self::$db->delete(self::TABLE,$where,__LINE__,__FILE__);
}
}
// catch Illegal mix of collations (ascii_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' (1267)
// caused by non-ascii chars compared with ascii field uid
catch(Api\Db\Exception $e) {
_egw_log_exception($e);
}
return $deleted;
}
/**
* Restore links being held as deleted waiting for purge of linked record (un-delete)
*
* @param string $app ='' app-name of links to remove
* @param string $id ='' id in $app or '' remove all links from $app
*/
static function restore($app, $id)
{
if (self::DEBUG)
{
echo "<p>solink.restore($app,$id)</p>\n";
}
if ($app == '')
{
return 0;
}
$check1 = array('link_app1' => $app);
$check2 = array('link_app2' => $app);
if ($id != '')
{
$check1['link_id1'] = $id;
$check2['link_id2'] = $id;
}
$where = self::$db->expression(self::TABLE,'((',$check1,') OR (',$check2,'))');
self::$db->update(self::TABLE,array('deleted'=> null), $where, __LINE__,__FILE__);
}
/**
* Changes ownership of all links from $owner to $new_owner
*
* This is needed when a user/account gets deleted
* Does NOT change the modification-time
*
* @param int $owner acount_id of owner to change
* @param int $new_owner account_id of new owner
* @return int number of links changed
*/
static function chown($owner,$new_owner)
{
if ((int)$owner <= 0 || (int) $new_owner <= 0)
{
return 0;
}
self::$db->update(self::TABLE,array('owner'=>$new_owner),array('owner'=>$owner),__LINE__,__FILE__);
return self::$db->affected_rows();
}
/**
* Get all links from a given app's entries to an other app's entries, which both link to the same 3. app and id
*
* Example:
* I search all timesheet's linked to a given project and id(s), who are also linked to other entries,
* which link to the same project:
*
* ($app='timesheet'/some id) <--a--> (other app/other id) <--b--> ($t_app='projectmanager'/$t_id=$pm_id)
* ^ ^
* +---------------------------c-----------------------------------------+
*
* Api\Link::get_3links('timesheet','projectmanager',$pm_id) returns the links (c) between the timesheet and the project,
* plus the other app/id in the keys 'app3' and 'id3'
*
* @param string $app app the returned links are linked on one side (atm. this must be link_app1!)
* @param string $target_app app the returned links other side link also to
* @param string|array $target_id =null id(s) the returned links other side link also to
* @param boolean $just_app_ids =false return array with link_id => app_id pairs, not the full link record
* @param string $order ='link_lastmod DESC' defaults to newest links first
* @param int|array $limit =null number of entries to return, default null = all or array(offset, num_rows) to return num_rows starting from offset
* @return array with links from entries from $app to $target_app/$target_id plus the other (b) link_id/app/id in the keys 'link3'/'app3'/'id3'
*/
static function get_3links($app, $target_app, $target_id=null, $just_app_ids=false, $order='link_lastmod DESC', $limit=null)
{
$table = self::TABLE;
$arrayofselects=array(
// retrieve the type of links, where the relation is realized as timesheet->infolog/tracker via infolog->projectmanager to timesheet->projectmanager
array('table'=>self::TABLE,
'cols'=>'c.*,b.link_app1 AS app3,b.link_id1 AS id3,b.link_id AS link3',
'where'=>'a.link_app1='.self::$db->quote($app).' AND c.link_app2='.self::$db->quote($target_app).
(!$target_id ? '' : self::$db->expression(self::TABLE,' AND c.',array('link_id2' => $target_id))),
'join'=>" a
JOIN $table b ON a.link_id2=b.link_id1 AND a.link_app2=b.link_app1
JOIN $table c ON a.link_id1=c.link_id1 AND a.link_app1=c.link_app1 AND a.link_id!=c.link_id AND c.link_app2=b.link_app2 AND c.link_id2=b.link_id2",
),
// retrieve the type of links, where the relation is realized as timesheet->infolog/tracker and projectmanager->timesheet
array('table'=>self::TABLE,
'cols'=>'b.link_id, b.link_app2 as app1, b.link_id2 as id1, b.link_app1 as app2, b.link_id1 as id2, b.link_remark,b.link_lastmod,b.link_owner,b.deleted,c.link_app1 AS app3,c.link_id1 AS id3,c.link_id AS link3',
'where'=>'a.link_app1='.self::$db->quote($app).' AND b.link_app1='.self::$db->quote($target_app).
(!$target_id ? '' : self::$db->expression(self::TABLE,' AND b.',array('link_id1' => $target_id))),
'join'=>" a
JOIN $table b ON a.link_id1=b.link_id2 AND a.link_app1=b.link_app2
JOIN $table c ON a.link_id2=c.link_id1 AND a.link_app2=c.link_app1 AND a.link_id!=c.link_id AND c.link_app2=b.link_app1 AND c.link_id2=b.link_id1",
),
// retrieve the type of links, where the relation is realized as timesheet->projectmanager and infolog->timesheet
array('table'=>self::TABLE,
'cols'=>'a.*,c.link_app1 AS app3,c.link_id1 AS id3,c.link_id AS link3',
'where'=>'a.link_app1='.self::$db->quote($app).' AND a.link_app2='.self::$db->quote($target_app).
(!$target_id ? '' : self::$db->expression(self::TABLE,' AND a.',array('link_id2' => $target_id))),
'join'=>" a
JOIN $table b ON a.link_id1=b.link_id2 AND a.link_app1=b.link_app2
JOIN $table c ON a.link_id2=c.link_id2 AND a.link_app2=c.link_app2 AND a.link_id!=c.link_id AND c.link_app1=b.link_app1 AND c.link_id1=b.link_id1",
),
);
$offset = false;
if (is_array($limit))
{
list($offset, $limit) = $limit;
}
elseif($limit)
{
$offset = 0;
}
$links = array();
foreach(self::$db->union($arrayofselects, __LINE__, __FILE__, $order, $offset, $limit) as $row)
{
if ($just_app_ids)
{
if ($row['link_app1'] == $target_app && (is_null($target_id) || in_array($row['link_id1'],(array)$target_id)))
{
$links[$row['link_id']] = $row['link_id2'];
}
else
{
$links[$row['link_id']] = $row['link_id1'];
}
}
else
{
$links[] = Api\Db::strip_array_keys($row,'link_');
}
}
// if query returns exactly limit rows, we assume there are more and therefore set self::$limit_exceeded
self::$limit_exceeded = $offset !== false && count($links) == $limit;
return $links;
}
/**
* Initialise our static vars
*/
static function init_static( )
{
self::$db = $GLOBALS['egw']->db;
}
}
Storage::init_static();
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