core/source/overwrites/auth_backend.php

<?php
/*
davina — Calendar data CalDAV conditioner
Copyright (C) 2025 Fenris <fenris@folksprak.org>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU 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 General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see 
<https://www.gnu.org/licenses/>. 
 */

namespace davina\overwrites;

require_once('vendor/autoload.php');
require_once(DIR_LOGIC . '/base.php');


/**
 */
class class_auth_backend
	extends \Sabre\DAV\Auth\Backend\AbstractBasic
	implements \Sabre\DAV\Auth\Backend\BackendInterface
{
	
	/**
	 * @var array {list<\davina\sources\interface_source>}
	 */
	private array $realms;
	
	
	/**
	 */
	public function __construct(
		array $realms
	)
	{
		// parent::__construct();
		$this->realms = $realms;
		$this->setRealm('davina');
	}
	
	
	/**
	 */
	protected function validateUserPass(
		/*string */$identifier,
		/*string */$password
	)/* : bool*/
	{
		$parts = \explode('-', $identifier, 2);
		$realm_name = $parts[0];
		$credentials = [
			'username' => (
				(\count($parts) >= 2)
				?
				$parts[1]
				:
				null
			),
			'password' => $password,
		];
		
		if (! \array_key_exists($realm_name, $this->realms))
		{
			return false;
		}
		else
		{
			$realm = $this->realms[$realm_name];
			if (! $realm->auth->check($credentials))
			{
				return false;
			}
			else
			{
				/**
				 * @todo check for security
				 */
				\davina\set_parameters(
					\array_merge(
						$realm->auth->determine_parameters($credentials),
						[
							'realm_name' => $realm_name,
						]
					)
				);
				try
				{
					$data = $realm->source->read();
					return ($data !== null);
				}
				catch (\Throwable $throwable)
				{
					return false;
				}
			}
		}
	}
	
}

 ?>