forked from extern/egroupware
230 lines
6.7 KiB
PHP
230 lines
6.7 KiB
PHP
<?php
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/**************************************************************************\
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* phpGroupWare - InfoLog Links *
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* http://www.phpgroupware.org *
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* Written by Ralf Becker <RalfBecker@outdoor-training.de> *
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* -------------------------------------------- *
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* This program is free software; you can redistribute it and/or modify it *
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* under the terms of the GNU General Public License as published by the *
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* Free Software Foundation; either version 2 of the License, or (at your *
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* option) any later version. *
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\**************************************************************************/
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/* $Id$ */
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/*!
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@class solink
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@author ralfbecker
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@abstract generalized linking between entries of phpGroupware apps - DB layer
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@discussion This class is to access the links in the DB
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@discussion Links have to ends each pointing to an entry, an entry is a double:
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@discussion app app-name or directory-name of an phpgw application, eg. 'infolog'
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@discussion id this is the id, eg. an integer or a tupple like '0:INBOX:1234'
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*/
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class solink // DB-Layer
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{
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var $public_functions = array
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(
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'link' => True,
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'get_links' => True,
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'unlink' => True,
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'chown' => True
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);
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var $db;
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var $user;
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var $db_name = 'phpgw_links';
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var $debug = 0;
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/*!
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@function solink
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@syntax solink( )
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@author ralfbecker
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@abstract constructor
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*/
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function solink( )
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{
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$this->db = $GLOBALS['phpgw']->db;
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$this->user = $GLOBALS['phpgw_info']['user']['account_id'];
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}
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/*!
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@function link
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@syntax link( $app1,$id1,$app2,$id2,$remark='',$user=0 )
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@author ralfbecker
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@abstract creats a link between $app1,$id1 and $app2,$id2
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@param $remark Remark to be saved with the link (defaults to '')
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@param $owner Owner of the link (defaults to user)
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@discussion Does NOT check if link already exists
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@result db-errno or -1 (for param-error) or 0 for success
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*/
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function link( $app1,$id1,$app2,$id2,$remark='',$owner=0,$lastmod=0 )
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{
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if ($this->debug)
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{
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echo "<p>solink.link('$app1',$id1,'$app2',$id2,'$remark',$owner)</p>\n";
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}
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if ($app1 == $app2 && $id1 == $id2 ||
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$id1 == '' || $id2 == '' || $app1 == '' || $app2 == '')
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{
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return -1; // dont link to self or other nosense
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}
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if (!$owner)
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{
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$owner = $this->user;
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}
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$remark = $this->db->db_addslashes($remark);
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if (!$lastmod)
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{
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$lastmod = time();
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}
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$this->unlink(0,$app1,$id1,'',$app2,$id2); // remove link if one exists
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$sql = "INSERT INTO $this->db_name (link_app1,link_id1,link_app2,link_id2,link_remark,link_lastmod,link_owner) ".
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" VALUES ('$app1','$id1','$app2','$id2','$remark',$lastmod,$owner)";
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if ($this->debug)
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{
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echo "<p>solink.link($app1,$id1,$app2,$id2,'$remark',$owner) sql='$sql'</p>\n";
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}
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$this->db->query($sql);
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return $this->db->errno;
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}
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/*!
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@function get_links
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@syntax get_links( $app,$id,$only_app='',$only_name='',$order='link_lastmod DESC' )
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@author ralfbecker
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@abstract returns array of links to $app,$id
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@param $only_app if set return only links from $only_app (eg. only addressbook-entries) or NOT from if $only_app[0]=='!'
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@param $order defaults to newest links first
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@result array of links (only_app: ids) or empty array if no matching links found
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*/
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function get_links( $app,$id,$only_app='',$order='link_lastmod DESC' )
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{
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$links = array();
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$sql = "SELECT * FROM $this->db_name".
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" WHERE (link_app1 = '$app' AND link_id1 = '$id')".
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" OR (link_app2 = '$app' AND link_id2 = '$id')".
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($order != '' ? " ORDER BY $order" : '');
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if ($this->debug)
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{
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echo "<p>solink.get_links($app,$id,$only_app,$order) sql='$sql'</p>\n";
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}
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$this->db->query($sql);
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if ($not_only = $only_app[0] == '!')
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{
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$only_app = substr($only_app,1);
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}
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while ($this->db->next_record())
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{
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$row = $this->db->Record;
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if ($row['link_app1'] == $app AND $row['link_id1'] == $id)
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{
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$link = array(
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'app' => $row['link_app2'],
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'id' => stripslashes($row['link_id2'])
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);
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}
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else
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{
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$link = array(
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'app' => $row['link_app1'],
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'id' => stripslashes($row['link_id1'])
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);
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}
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if ($only_app && $not_only == ($link['app'] == $only_app) ||
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!$GLOBALS['phpgw_info']['user']['apps'][$link['app']])
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{
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continue;
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}
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$link['remark'] = stripslashes($row['link_remark']);
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$link['owner'] = $row['link_owner'];
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$link['lastmod'] = $row['link_lastmod'];
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$link['link_id'] = $row['link_id'];
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$links[] = $only_app && !$not_only ? $link['id'] : $link;
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}
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return $links;
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}
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/*!
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@function unlink
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@syntax unlink( $link_id,$app='',$id='',$owner='',$app2='',$id2='' )
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@author ralfbecker
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@abstract Remove link with $link_id or all links matching given params
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@param $link_id link-id to remove if > 0
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@param $app,$id,$owner,$app2,$id2 if $link_id <= 0: removes all links matching the non-empty params
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@result the number of links deleted
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*/
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function unlink($link_id,$app='',$id='',$owner='',$app2='',$id2='')
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{
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$sql = "DELETE FROM $this->db_name WHERE ";
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if ($link_id > 0)
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{
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$sql .= "link_id=$link_id";
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}
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elseif ($app == '' AND $owner == '')
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{
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return 0;
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}
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else
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{
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if ($app != '' && $app2 == '')
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{
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$sql .= "((link_app1='$app'";
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$sql2 = '';
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if ($id != '')
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{
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$sql .= " AND link_id1='$id'";
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$sql2 .= " AND link_id2='$id'";
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}
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$sql .= ") OR (link_app2='$app'$sql2))";
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}
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elseif ($app != '' && $app2 != '')
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{
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$sql .= "((link_app1='$app' AND link_id1='$id' AND link_app2='$app2' AND link_id2='$id2') OR";
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$sql .= " (link_app1='$app2' AND link_id1='$id2' AND link_app2='$app' AND link_id2='$id'))";
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}
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if ($owner != '')
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{
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$sql .= ($app != '' ? ' AND ' : '') . "link_owner='$owner'";
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}
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}
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if ($this->debug)
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{
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echo "<p>solink.unlink($link_id,$app,$id,$owner,$app2,$id2) sql='$sql'</p>\n";
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}
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$this->db->query($sql);
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return $this->db->affected_rows();
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}
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/*!
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@function chown
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@syntax chown( $owner,$new_owner )
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@author ralfbecker
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@abstract Changes ownership of all links from $owner to $new_owner
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@discussion This is needed when a user/account gets deleted
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@discussion Does NOT change the modification-time
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@result the number of links changed
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*/
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function chown($owner,$new_owner)
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{
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if ($owner <= 0 || $new_owner <= 0)
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{
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return 0;
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}
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$this->db->query("UPDATE $this->db_name SET owner=$new_owner WHERE owner=$owner");
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return $this->db->affected_rows();
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}
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}
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