export default class AuthorizationCache {
    private config;
    private cache;
    private disposalTimer;
    constructor(config: any);
    dispose(): void;
    /**
     * Update token lifetime.
     * @param series DICOM series instance UID.
     * @param token The token previously issued.
     */
    update(series: string, token: string): void;
    /**
     * Removes all the previously made tokens.
     */
    reset(): void;
    /**
     * Validate query string to check if access is granted.
     * @param req HTTP request. Must contain 'series' query parameter and Authorization http header.
     * @return True if the access to the series is granted.
     */
    isValid(series: string, token: string): boolean;
}