DefaultUserService.swift

func signIn(request: Request, user: User) throws -> Future<AccessDto> {
        return User
            .query(on: request)
            .filter(\.login == user.login)
            .first()
            .unwrap(or: Abort(.badRequest, reason: "User with login \(user.login) not found"))
            .flatMap { persistedUser in
                let digest = try request.make(BCryptDigest.self)
                
                if try digest.verify(user.password, created: persistedUser.password) {
                    let accessToken = try TokenHelpers.createAccessToken(from: persistedUser)
                    let expiredAt = try TokenHelpers.expiredDate(of: accessToken)
                    let refreshToken = TokenHelpers.createRefreshToken()
                    let accessDto = AccessDto(refreshToken: refreshToken, accessToken: accessToken, expiredAt: expiredAt)
                    
                    return RefreshToken(token: refreshToken, userID: try persistedUser.requireID())
                        .save(on: request)
                        .transform(to: accessDto)
                } else {
                    throw Abort(.badRequest, reason: "Incorrect user password")
                }
        }
}