import type { Cookie } from "@remix-run/server-runtime";
export type CSRFErrorCode =
  | "missing_token_in_cookie"
  | "invalid_token_in_cookie"
  | "tampered_token_in_cookie"
  | "missing_token_in_body"
  | "mismatched_token";
export declare class CSRFError extends Error {
  code: CSRFErrorCode;
  constructor(code: CSRFErrorCode, message: string);
}
interface CSRFOptions {
  /**
   * The cookie object to use for serializing and parsing the CSRF token.
   */
  cookie: Cookie;
  /**
   * The name of the form data key to use for the CSRF token.
   */
  formDataKey?: string;
  /**
   * A secret to use for signing the CSRF token.
   */
  secret?: string;
}
export declare class CSRF {
  private cookie;
  private formDataKey;
  private secret?;
  constructor(options: CSRFOptions);
  /**
   * Generates a random string in Base64URL to be used as an authenticity token
   * for CSRF protection.
   * @param bytes The number of bytes used to generate the token
   * @returns A random string in Base64URL
   */
  generate(bytes?: number): string;
  /**
   * Generates a token and serialize it into the cookie.
   * @param bytes The number of bytes used to generate the token
   * @returns A tuple with the token and the string to send in Set-Cookie
   * @example
   * let [token, cookie] = await csrf.commitToken();
   * return json({ token }, {
   *   headers: { "set-cookie": cookie }
   * })
   */
  commitToken(bytes?: number): Promise<readonly [string, string]>;
  /**
   * Verify if a request and cookie has a valid CSRF token.
   * @example
   * export async function action({ request }: ActionArgs) {
   *   await csrf.validate(request);
   *   // the request is authenticated and you can do anything here
   * }
   * @example
   * export async function action({ request }: ActionArgs) {
   *   let formData = await request.formData()
   *   await csrf.validate(formData, request.headers);
   *   // the request is authenticated and you can do anything here
   * }
   * @example
   * export async function action({ request }: ActionArgs) {
   *   let formData = await parseMultipartFormData(request);
   *   await csrf.validate(formData, request.headers);
   *   // the request is authenticated and you can do anything here
   * }
   */
  validate(data: Request): Promise<void>;
  validate(data: FormData, headers: Headers): Promise<void>;
  private readBody;
  private parseCookie;
  private sign;
  private verifySignature;
}
export {};
