fix(middleware-flexible-checksums): use input from args and not middleware config

[trivikr]

Issue

Refs: #6492 (comment)

Description

Use input from args and not middleware config in flexible checksums middleware.

This is because args.input will have updated values, while middlewareConfig.input will have initial values.
We're updating value in input[requestAlgorithmMember] in #6492

Testing

CI

import { S3 } from "../aws-sdk-js-v3/clients/client-s3/dist-cjs/index.js";
import { NodeHttpHandler } from "@smithy/node-http-handler";
import { equal } from "assert";

// Prints checksum headers for request and response.
class CustomHandler extends NodeHttpHandler {
  constructor() {
    super();
  }

  printChecksumHeaders(prefix, headers) {
    for (const [header, value] of Object.entries(headers)) {
      if (header.startsWith("x-amz-checksum-") || header.startsWith("x-amz-sdk-checksum-")) {
        console.log(`${prefix}['${header}']: '${value}'`);
      }
    }
  }

  async handle(request, options) {
    this.printChecksumHeaders("request", request.headers);
    const response = await super.handle(request, options);
    this.printChecksumHeaders("response", response.response.headers);
    return response;
  }
}

const client = new S3({ requestHandler: new CustomHandler() });
const Bucket = "test-flexible-checksums-v2"; // Replace with your test bucket name.
const Key = "hello-world.txt";
const Body = "Hello World"; // Replace with the content you want to test.

console.log("Put Object");
await client.putObject({ Bucket, Key, Body, ChecksumAlgorithm: "CRC32" });

console.log("\nGet Object");
const response = await client.getObject({ Bucket, Key, ChecksumMode: "ENABLED" });

equal(Body, await response.Body.transformToString());

Checksum headers are set when ChecksumAlgorithm and ChecksumMode are set.

Put Object
request['x-amz-sdk-checksum-algorithm']: 'CRC32'
request['x-amz-checksum-crc32']: 'ShexVg=='
response['x-amz-checksum-crc32']: 'ShexVg=='

Get Object
request['x-amz-checksum-mode']: 'ENABLED'
response['x-amz-checksum-crc32']: 'ShexVg=='

Checksum headers are not set when ChecksumAlgorithm and ChecksumMode are not set.

Put Object

Get Object

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