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Source.php
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Source.php
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<?php
/**
* This file is part of the Kolab Server Free/Busy Service
*
* @author Thomas Bruederli <bruederli@kolabsys.com>
*
* Copyright (C) 2013, Kolab Systems AG <contact@kolabsys.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace Kolab\FreeBusy;
/**
* Abstract class to fetch free/busy data from a specific source
*/
abstract class Source
{
protected $config = array();
protected $cached = false;
/**
* Factory method creating an instace of Source according to config
*
* @param string Source URI
* @param array Hash array with config
*/
public static function factory($url, $conf)
{
$config = parse_url($url);
$config['url'] = $url;
switch ($config['scheme']) {
case 'file': return new SourceFile($config + $conf);
case 'imap':
case 'imaps': return new SourceIMAP($config + $conf);
case 'http':
case 'https': return new SourceURL($config + $conf);
case 'fbd':
case 'fbdaemon': return new SourceFBDaemon($config + $conf);
case 'aggregate': return new SourceAggregator($config + $conf);
}
Logger::get('source')->addError("Invalid source configuration: " . $url);
return null;
}
/**
* Default constructor
*/
public function __construct($config)
{
$this->config = $config;
}
/**
* Retrieve free/busy data for the given user
*
* @param array Hash array with user attributes
*/
abstract public function getFreeBusyData($user, $extended);
/**
* Replace all %varname strings in config with values from $user
*/
protected function getUserConfig($user)
{
$config = array();
foreach ($this->config as $k => $val) {
if (is_string($val) && strpos($val, '%') !== false) {
$val = preg_replace_callback(
'/%\{?([a-z0-9]+)\}?/',
function($m) use ($k, $user) {
$enc = $k == 'url' || $k == 'query' || $k == 'fbsource';
return $enc ? urlencode($user[$m[1]]) : $user[$m[1]];
},
$val);
}
$config[$k] = $val;
}
return $config;
}
/**
* Helper method to check if a cached file exists and is still valid
*
* @param array Hash array with (replaced) config properties
* @return string Cached free-busy data or false if cache file doesn't exist or is expired
*/
protected function getCached($config)
{
if ($config['cacheto'] && file_exists($config['cacheto'])) {
if (empty($config['expires']) || filemtime($config['cacheto']) + Utils::getOffsetSec($config['expires']) >= time()) {
$this->cached = true;
return file_get_contents($config['cacheto']);
}
}
return false;
}
/**
* Return the value of the 'cached' flag
*/
public function isCached()
{
return $this->cached;
}
}

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