sign

SignatureV4.sign() signs an HTTP request with the AWS Signature V4 algorithm. Given an HTTP request description, it returns a new HTTP request with the AWS signature v4 protocol headers added. It returns an Object holding a url and a headers properties, ready to use in the context of k6’s HTTP call.

Parameters

The first parameter of the sign method consists of an Object with the following properties.

Property	Type	Description
method	string	The HTTP method of the request
endpoint	Endpoint	The endpoint of the request. The Endpoint constructor can be imported from both the `aws.js` bundle, as well as the `signature.js` file, and takes a string of the form `{scheme}://{hostname}[:{port}]` as input, allowing to define the target of the request (See provided example below).
path	string	The path of the request
headers	Object	The headers of the HTTP request
body (optional)	string or ArrayBuffer	The optional body of the HTTP request
query (optional)	`Object.<string, string \| Array.<string>>`	The optional query parameters of the HTTP request

You can override SignatureV4 options in the context of this specific request. To do this, pass a second parameter to the sign method, which is an Object with the following parameters.

Property	Type	Description
signingDate	Date	overrides the Date used in the signing operation
signingService	string	overrides the signer’s AWS service in the context of the `sign` operation.
signingRegion	string	overrides the signer’s AWS region in the context of the `sign` operation
unsignableHeaders	`Set<string>`	excludes headers from the signing process
signableHeaders	`Set<string>`	mark headers as signed

Returns

Property	Type	Description
headers	Object	The signed request’s headers to use in the context of a k6 HTTP request
url	string	The signed url to use in the context of a k6 HTTP request

Example

import http from 'k6/http';

import {
  AWSConfig,
  Endpoint,
  SignatureV4,
} from 'https://jslib.k6.io/aws/0.12.3/signature.js';

const awsConfig = new AWSConfig({
  region: __ENV.AWS_REGION,
  accessKeyId: __ENV.AWS_ACCESS_KEY_ID,
  secretAccessKey: __ENV.AWS_SECRET_ACCESS_KEY,
  sessionToken: __ENV.AWS_SESSION_TOKEN,
});

export default function () {
  /**
   * In order to be able to sign an HTTP request's,
   * we need to instantiate a SignatureV4 object.
   */
  const signer = new SignatureV4({
    service: 's3',
    region: awsConfig.region,
    credentials: {
      accessKeyId: awsConfig.accessKeyId,
      secretAccessKey: awsConfig.secretAccessKey,
      sessionToken: awsConfig.sessionToken,
    },

    /**
     * Whether the URI should be escaped or not.
     */
    uriEscapePath: false,

    /**
     * Whether or not the body's hash should be calculated and included
     * in the request.
     */
    applyChecksum: true,
  });

  /**
   * The sign operation will return a new HTTP request with the
   * AWS signature v4 protocol headers added. It returns an Object
   * implementing the SignedHTTPRequest interface, holding a `url` and a `headers`
   * properties, ready to use in the context of k6's http call.
   */
  const signedRequest = signer.sign(
    /**
     * HTTP request description
     */
    {
      /**
       * The HTTP method we will use in the request.
       */
      method: 'GET',

      /**
       * The endpoint of the service we will be making the request to.
       *
       * The endpoint is instantiated from a URL string, of the format: `{scheme}://{hostname}[:{port}]`
       */
      endpoint: new Endpoint('https://s3.us-east-1.amazonaws.com'),

      /**
       * The path of the request.
       */
      path: '/my-bucket/bonjour.txt',

      /**
       * The query parameters to include in the request.
       */
      query: {
        'abc': '123',
        'easy as': ['do', 're', 'mi'],
      },

      /**
       * The headers we will be sending in the request.
       */
      headers: {},

      /**
       * The body of the request.
       */
      body: null,
    },

    /**
     * (optional) Signature operation options allows to override the
     * SignatureV4's options in the context of this specific request.
     */
    {
      /**
       * The date and time to be used as signature metadata. This value should be
       * a Date object, a unix (epoch) timestamp, or a string that can be
       * understood by the JavaScript `Date` constructor.If not supplied, the
       * value returned by `new Date()` will be used.
       */
      signingDate: new Date(),

      /**
       * The service signing name. It will override the service name of the signer
       * in current invocation
       */
      signingService: 's3',

      /**
       * The region name to sign the request. It will override the signing region of the
       * signer in current invocation
       */
      signingRegion: 'us-east-1',
    }
  );

  http.get(signedRequest.url, { headers: signedRequest.headers });
}