@aws-amplify/core/dist/cjs/clients/internal/composeTransferHandler.js

Core category of aws-amplify

'use strict';

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
Object.defineProperty(exports, "__esModule", { value: true });
exports.composeTransferHandler = void 0;
/**
 * Compose a transfer handler with a core transfer handler and a list of middleware.
 * @param coreHandler Core transfer handler
 * @param middleware	List of middleware
 * @returns A transfer handler whose option type is the union of the core
 * 	transfer handler's option type and the middleware's option type.
 * @internal
 */
const composeTransferHandler = (coreHandler, middleware) => (request, options) => {
    const context = {};
    let composedHandler = (composeHandlerRequest) => coreHandler(composeHandlerRequest, options);
    for (let i = middleware.length - 1; i >= 0; i--) {
        const m = middleware[i];
        const resolvedMiddleware = m(options);
        composedHandler = resolvedMiddleware(composedHandler, context);
    }
    return composedHandler(request);
};
exports.composeTransferHandler = composeTransferHandler;
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