import * as Bunyan from "bunyan";
import { CallHandler, ExecutionContext, NestInterceptor } from '@nestjs/common';
import { Observable } from 'rxjs';
import { Request as ExpressRequest } from "express";
import { IdentifiedBillBase } from '../types';
import { StringTo } from '../helper-types';
export declare type PrincipalFnRet<TIdentifiedBill extends IdentifiedBillBase> = TIdentifiedBill | null | false;
export declare type PrincipalFn<TIdentifiedBill extends IdentifiedBillBase> = (headers: StringTo<string | string[] | undefined>, cookies: StringTo<string>, request: ExpressRequest) => PrincipalFnRet<TIdentifiedBill> | Promise<PrincipalFnRet<TIdentifiedBill>>;
export interface HttpAuthnOptions<TIdentifiedBill extends IdentifiedBillBase> {
    principalFn: PrincipalFn<TIdentifiedBill>;
    anonymousScopes: ReadonlyArray<string>;
    logger?: Bunyan;
}
export declare class HttpAuthnInterceptor<TIdentifiedBill extends IdentifiedBillBase> implements NestInterceptor {
    private readonly _options;
    private readonly _logger;
    constructor(_options: HttpAuthnOptions<TIdentifiedBill>);
    private _doAuthn;
    private _unauthorized;
    private _buildIdentity;
    private _shortCircuitBadAuth;
    intercept(context: ExecutionContext, next: CallHandler): Promise<Observable<any>>;
}