/**
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0.
 */
import crt_native from './binding';
import { HttpRequest } from './http';
import { ClientBootstrap } from './io';
/**
 * AWS signing algorithm enumeration.
 *
 * @module aws-crt
 * @category Auth
 */
export declare enum AwsSigningAlgorithm {
    /** Use the Aws signature version 4 signing process to sign the request */
    SigV4 = 0
}
/**
 * AWS signature type enumeration.
 *
 * @category Auth
 */
export declare enum AwsSignatureType {
    /** Sign an http request and apply the signing results as headers */
    HttpRequestViaHeaders = 0,
    /** Sign an http request and apply the signing results as query params */
    HttpRequestViaQueryParams = 1,
    /** Sign an http request payload chunk */
    HttpRequestChunk = 2,
    /** Sign an event stream event */
    HttpRequestEvent = 3
}
/**
 * Values for use with {@link AwsSigningConfig.signed_body_value}.
 *
 * Some services use special values (e.g. 'UNSIGNED-PAYLOAD') when the body
 * is not being signed in the usual way.
 *
 * @category Auth
 */
export declare enum AwsSignedBodyValue {
    /** Use the SHA-256 of the empty string as the canonical request payload value */
    EmptySha256 = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
    /** Use the literal string 'UNSIGNED-PAYLOAD' as the canonical request payload value  */
    UnsignedPayload = "UNSIGNED-PAYLOAD",
    /** Use the literal string 'STREAMING-AWS4-HMAC-SHA256-PAYLOAD' as the canonical request payload value  */
    StreamingAws4HmacSha256Payload = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD",
    /** Use the literal string 'STREAMING-AWS4-HMAC-SHA256-EVENTS' as the canonical request payload value  */
    StreamingAws4HmacSha256Events = "STREAMING-AWS4-HMAC-SHA256-EVENTS"
}
/**
 * AWS signed body header enumeration.
 *
 * @category Auth
 */
export declare enum AwsSignedBodyHeaderType {
    /** Do not add a header containing the canonical request payload value */
    None = 0,
    /** Add the X-Amz-Content-Sha256 header with the canonical request payload value */
    XAmzContentSha256 = 1
}
/**
 * Credentials providers source the AwsCredentials needed to sign an authenticated AWS request.
 *
 * @module aws-crt
 * @category Auth
 */
export declare class AwsCredentialsProvider extends crt_native.AwsCredentialsProvider {
    static newDefault(bootstrap: ClientBootstrap): AwsCredentialsProvider;
}
/**
 * Configuration for use in AWS-related signing.
 * AwsSigningConfig is immutable.
 * It is good practice to use a new config for each signature, or the date might get too old.
 *
 * @module aws-crt
 * @category Auth
 */
export declare type AwsSigningConfig = crt_native.AwsSigningConfig;
/**
 * Perform AWS HTTP request signing.
 *
 * The {@link HttpRequest} is transformed asynchronously,
 * according to the {@link AwsSigningConfig}.
 *
 * When signing:
 *  1.  It is good practice to use a new config for each signature,
 *      or the date might get too old.
 *
 *  2.  Do not add the following headers to requests before signing, they may be added by the signer:
 *      x-amz-content-sha256,
 *      X-Amz-Date,
 *      Authorization
 *
 *  3.  Do not add the following query params to requests before signing, they may be added by the signer:
 *      X-Amz-Signature,
 *      X-Amz-Date,
 *      X-Amz-Credential,
 *      X-Amz-Algorithm,
 *      X-Amz-SignedHeaders
 * @param request The HTTP request to sign.
 * @param config Configuration for signing.
 * @returns A Future whose result will be the signed
 *       {@link HttpRequest}. The future will contain an exception
 *       if the signing process fails.
 *
 * @module aws-crt
 * @category Auth
 */
export declare function aws_sign_request(request: HttpRequest, config: AwsSigningConfig): Promise<HttpRequest>;