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Editing: PDO.php

<?php

declare(strict_types=1);

namespace Sabre\DAV\Auth\Backend;

/**
 * This is an authentication backend that uses a database to manage passwords.
 *
 * @copyright Copyright (C) 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.
     */
    public function __construct(\PDO $pdo)
    {
        $this->pdo = $pdo;
    }

/**
     * Returns the digest hash for a user.
     *
     * @param string $realm
     * @param string $username
     *
     * @return string|null
     */
    public function getDigestHash($realm, $username)
    {
        $stmt = $this->pdo->prepare('SELECT digesta1 FROM '.$this->tableName.' WHERE username = ?');
        $stmt->execute([$username]);

return $stmt->fetchColumn() ?: null;
    }
}

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