import type { RandomService } from "./random.ts";
import type { Store } from "./store.ts";
import type { TokenService } from "./tokens.ts";
/**
 * @ignore
 *
 * An in-progress authentication, being stored while the client completes their challenge
 */
export interface AuthnRequest {
    userId: number;
    redirect: string;
    code: number;
}
/**
 * @ignore
 *
 * Intermediary parameters to present to the user to complete their authentication
 */
export interface AuthnCheck {
    token: string;
    code: number;
}
/**
 * @ignore
 *
 * Completed credentials after completing an authentication,
 * including cookie+redirected headers and the redirect itself
 */
export interface AuthnResult {
    token: string;
    headers: Headers;
    redirect: string;
}
/**
 * @ignore
 */
export interface AbstractAuthenticationService {
    check(token: string | undefined | null, code: string | number | undefined | null): Promise<AuthnRequest | null>;
    start(userId: number, redirectUrl: string | URL): Promise<AuthnCheck>;
    finish(request: AuthnRequest): Promise<AuthnResult>;
}
/**
 * @ignore
 */
export declare function formatAuthenticationCode(code: number): string;
/**
 * @ignore
 */
export interface AuthenticationServiceOptions {
    allowedHosts: () => URL[] | Promise<URL[]>;
    cookieName: string;
    /** milliseconds */ loginDuration: number;
    /** milliseconds */ sessionDuration: number;
}
/** @ignore */
export declare class AuthenticationService implements AbstractAuthenticationService {
    options: AuthenticationServiceOptions;
    store: Store;
    random: RandomService;
    tokens: TokenService;
    constructor(options: AuthenticationServiceOptions, store: Store, random: RandomService, tokens: TokenService);
    _canRedirect(input: string | URL, hosts: URL[]): boolean;
    check(token: string | undefined | null, code: string | number | undefined | null): Promise<AuthnRequest | null>;
    start(userId: number, redirectUrl: string | URL): Promise<AuthnCheck>;
    finish(request: AuthnRequest): Promise<AuthnResult>;
}
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