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@smithy/signature-v4

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@smithy/signature-v4

A standalone implementation of the AWS Signature V4 request signing algorithm

  • 4.2.4
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  • npm
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What is @smithy/signature-v4?

@smithy/signature-v4 is an npm package used for signing AWS requests using the AWS Signature Version 4 signing process. This is essential for securely making authenticated requests to AWS services.

What are @smithy/signature-v4's main functionalities?

Signing HTTP Requests

This feature allows you to sign HTTP requests to AWS services using the AWS Signature Version 4 signing process. The code sample demonstrates how to sign a GET request to an S3 bucket.

const { SignatureV4 } = require('@smithy/signature-v4');
const { Sha256 } = require('@aws-crypto/sha256-js');
const { HttpRequest } = require('@smithy/protocol-http');

const signer = new SignatureV4({
  service: 's3',
  region: 'us-east-1',
  credentials: {
    accessKeyId: 'AKID',
    secretAccessKey: 'SECRET'
  },
  sha256: Sha256
});

const request = new HttpRequest({
  method: 'GET',
  hostname: 'examplebucket.s3.amazonaws.com',
  path: '/exampleobject'
});

signer.sign(request).then(signedRequest => {
  console.log(signedRequest);
});

Presigning URLs

This feature allows you to generate presigned URLs for AWS services, which can be used to grant temporary access to resources. The code sample demonstrates how to presign a URL for an S3 object with a 1-hour expiration.

const { SignatureV4 } = require('@smithy/signature-v4');
const { Sha256 } = require('@aws-crypto/sha256-js');
const { HttpRequest } = require('@smithy/protocol-http');
const { formatUrl } = require('@smithy/util-format-url');

const signer = new SignatureV4({
  service: 's3',
  region: 'us-east-1',
  credentials: {
    accessKeyId: 'AKID',
    secretAccessKey: 'SECRET'
  },
  sha256: Sha256
});

const request = new HttpRequest({
  method: 'GET',
  hostname: 'examplebucket.s3.amazonaws.com',
  path: '/exampleobject'
});

signer.presign(request, { expiresIn: 3600 }).then(presignedUrl => {
  console.log(formatUrl(presignedUrl));
});

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Package last updated on 09 Dec 2024

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