PDO.php
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PDO.php
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	<?php

	namespace Sabre\DAV\Auth\Backend;

	/**
	* This is an authentication backend that uses a database to manage passwords.
	*
	* @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
	* @author Evert Pot (http://evertpot.com/)
	* @license http://sabre.io/license/ Modified BSD License
	*/
	class PDO extends AbstractDigest {

	/**
	* Reference to PDO connection
	*
	* @var PDO
	*/
	protected $pdo;

	/**
	* PDO table name we'll be using
	*
	* @var string
	*/
	public $tableName = 'users';


	/**
	* Creates the backend object.
	*
	* If the filename argument is passed in, it will parse out the specified file fist.
	*
	* @param PDO $pdo
	*/
	function __construct(\PDO $pdo) {

	$this->pdo = $pdo;

	}

	/**
	* Returns the digest hash for a user.
	*
	* @param string $realm
	* @param string $username
	* @return string\|null
	*/
	function getDigestHash($realm, $username) {

	$stmt = $this->pdo->prepare('SELECT digesta1 FROM ' . $this->tableName . ' WHERE username = ?');
	$stmt->execute([$username]);
	return $stmt->fetchColumn() ?: null;

	}

	}