<?php
class Auth_Base {
	private $pdo;

	const AUTH_SERVICE_API = '_api';

	function __construct() {
		$this->pdo = Db::pdo();
	}

	/**
	 * @SuppressWarnings(unused)
	 */
	function check_password($owner_uid, $password, $service = '') {
		return false;
	}

	/**
	 * @SuppressWarnings(unused)
	 */
	function authenticate($login, $password, $service = '') {
		return false;
	}

	// Auto-creates specified user if allowed by system configuration
	// Can be used instead of find_user_by_login() by external auth modules
	function auto_create_user($login, $password = false) {
		if ($login && defined('AUTH_AUTO_CREATE') && AUTH_AUTO_CREATE) {
			$user_id = $this->find_user_by_login($login);

			if (!$password) $password = make_password();

			if (!$user_id) {
				$salt = substr(bin2hex(get_random_bytes(125)), 0, 250);
				$pwd_hash = encrypt_password($password, $salt, true);

				$sth = $this->pdo->prepare("INSERT INTO ttrss_users
						(login,access_level,last_login,created,pwd_hash,salt)
						VALUES (?, 0, null, NOW(), ?,?)");
				$sth->execute([$login, $pwd_hash, $salt]);

				return $this->find_user_by_login($login);

			} else {
				return $user_id;
			}
		}

		return $this->find_user_by_login($login);
	}

	function find_user_by_login($login) {
		$sth = $this->pdo->prepare("SELECT id FROM ttrss_users WHERE
			login = ?");
		$sth->execute([$login]);

		if ($row = $sth->fetch()) {
			return $row["id"];
		} else {
			return false;
		}

	}
}