Source.php
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Source.php
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	<?php

	namespace Kolab\FreeBusy;

	/**
	* Abstract class to fetch free/busy data from a specific source
	*/
	abstract class Source
	{
	protected $config = array();

	/**
	* Factory method creating an instace of Source according to config
	*
	* @param array Hash array with config
	*/
	public static function factory($url)
	{
	$config = parse_url($url);
	switch ($config['scheme']) {
	case 'file': return new SourceFile($config);
	case 'imap': return new SourceIMAP($config);
	case 'http':
	case 'https': return new SourceURL($url);
	}

	trigger_error("Invalid source configuration: " . $url, E_USER_ERROR);
	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 ($user) { return $user[$m[1]]; },
	$val);
	}

	$config[$k] = $val;
	}

	return $config;
	}
	}