export declare const MAX_BODY = 131072;
/**
 * Create timestamp with format "yyyyMMddTHH:mm:ss+0000"
 *
 * @returns {string} Timestamp in format "yyyyMMddTHH:mm:ss+0000"
 */
export declare function createTimestamp(): string;
/**
 * Returns the hash of the contents of a stream
 *
 * @param {ReadableStream} stream A stream to read
 * @returns {Promise<string>} hash of contents of stream
 */
export declare function streamHash(stream: ReadableStream): Promise<string>;
/**
 * Returns data to be signed for a request
 * @param {Request} request       The request Object to sign.
 * @param {String} authHeader     The authorization header.
 * @param {String} [contentHash]  The hash of the body content to include in the signature.
 *
 * @returns {Promise<String>}     A Promise resolving to a string containing the data to be signed
 *
 */
export declare function dataToSign(request: Request, authHeader: string, contentHash?: string): Promise<string>;
/**
 * Determines if the http status code represents a redirect
 *
 * @param {number} statusCode    The status codefrom an HTTP request
 *
 * @returns {boolean}     `true` if the status code represents a redirect.  Else `false`
 *
 */
export declare function isRedirect(statusCode: number): boolean;
/**
 * Returns an HMAC signature, using SHA256 hash algorigthm
 * @param {string} data   The data to be signed
 * @param {string} key    The key used to sign data
 *
 * @returns {Promise<string>}      The signature
 *
 */
export declare function base64HmacSha256(data: string, key: string): Promise<string>;
/**
 * Creates a String containing a tab delimited set of headers.
 * @param  {Object} headers Object containing the headers to add to the set.
 * @returns {String}         String containing a tab delimited set of headers.
 */
export declare function canonicalizeHeaders(headers: {
    [x: string]: string;
}): string;
/**
 * Creates a String containing a tab delimited set of headers.
 * @param  {string} timestamp    Timestamp in format "yyyyMMddTHH:mm:ss+0000"
 * @param  {string} clientSecret Client secret
 *
 * @returns {Promise<string>}    Promise resolving to the signing key
 */
export declare function signingKey(timestamp: string, clientSecret: string): Promise<string>;
/**
 *
 * @param {Object} request       The request Object.
 * @param {string} timestamp     The timestamp with format "yyyyMMddTHH:mm:ss+0000".
 * @param {string} clientSecret  The client secret value from the .edgerc file.
 * @param {string} authHeader    The authorization header.
 * @param {String} [contentHash] The hash of the body content to include in the signature.
 *
 * @returns {Promise<string>}    A Promise resolving to a string represented the requests signature
 */
export declare function signRequestWithContentHash(request: Request, timestamp: string, clientSecret: string, authHeader: string, contentHash?: string): Promise<string>;