aws4-axios

This is a request interceptor for the Axios HTTP request library to allow requests to be signed with an AWSv4 signature.

This may be useful for accessing AWS services protected with IAM auth such as an API Gateway.

Installation

yarn	npm
`yarn add aws4-axios`	`npm install --save aws4-axios`

Compatibility

This interceptor is heavily dependent on Axios internals, so minor changes to them can cause the interceptor to fail.

Please make sure you are using one of the following versions of Axios before submitting issues etc.

Axios Version	Supported?
`< 1.4.0`	❌ No
`>= 1.4.0 <= 1.6.7`	✅ Yes
`> 1.6.7`	Unknown

Usage

To add an interceptor to the default Axios client:

import axios from "axios";
import { aws4Interceptor } from "aws4-axios";

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
  },
});

axios.interceptors.request.use(interceptor);

// Requests made using Axios will now be signed
axios.get("https://example.com/foo").then((res) => {
  // ...
});

Or you can add the interceptor to a specific instance of an Axios client:

import axios from "axios";
import { aws4Interceptor } from "aws4-axios";

const client = axios.create();

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
  },
});

client.interceptors.request.use(interceptor);

// Requests made using Axios will now be signed
client.get("https://example.com/foo").then((res) => {
  // ...
});

You can also pass AWS credentials in explicitly (otherwise taken from process.env)

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
  },
  credentials: {
    accessKeyId: "",
    secretAccessKey: "",
  },
});

You can also pass a custom CredentialsProvider factory instead

const customCredentialsProvider = {
  getCredentials: async () => {
    return Promise.resolve({
      accessKeyId: "custom-provider-access-key-id",
      secretAccessKey: "custom-provider-secret-access-key",
    });
  },
};

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
  },
  credentials: customCredentialsProvider,
});

Migration to v3

The interface for options changed in v3. You should now pass a single object with configuration.

The previous options object is now nested under the property options.

E.g (v2).

const interceptor = aws4Interceptor({
  region: "eu-west-2",
  service: "execute-api",
  assumeRoleArn: "arn:aws:iam::111111111111:role/MyRole",
});

would become (v3):

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
    assumeRoleArn: "arn:aws:iam::111111111111:role/MyRole",
  },
});

If you passed a custom credential provider, this is now done via the credentials property.

E.g (v2).

const interceptor = aws4Interceptor(
  {
    region: "eu-west-2",
    service: "execute-api",
  },
  {
    accessKeyId: "AKIAIOSFODNN7EXAMPLE",
    secretAccessKey: "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY",
  }
);

would become (v3):

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
    assumeRoleArn: "arn:aws:iam::111111111111:role/MyRole",
  },
  credentials: {
    accessKeyId: "AKIAIOSFODNN7EXAMPLE",
    secretAccessKey: "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY",
  },
});

Assuming the IAM Role

You can pass a parameter to assume the IAM Role with AWS STS and use the assumed role credentials to sign the request. This is useful when doing cross-account requests.

const interceptor = aws4Interceptor({
  options: {
    region: "eu-west-2",
    service: "execute-api",
    assumeRoleArn: "arn:aws:iam::111111111111:role/MyRole",
    assumeRoleSessionName: "MyApiClient", // optional, default value is "axios"
  },
});

Obtained credentials are cached and refreshed as needed after they expire.

You can use expirationMarginSec parameter to set the number of seconds before the received credentials expiration time to invalidate the cache. This allows setting a safety margin. Default to 5 seconds.