Class: Kubeclient::AmazonEksCredentials

Inherits:
Object
  • Object
show all
Defined in:
lib/kubeclient/aws_eks_credentials.rb

Overview

Get a bearer token to authenticate against aws eks.

Defined Under Namespace

Classes: AmazonEksDependencyError

Class Method Summary collapse

Class Method Details

.token(credentials, eks_cluster) ⇒ Object 



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# File 'lib/kubeclient/aws_eks_credentials.rb', line 10

def token(credentials, eks_cluster)
  begin
    require 'aws-sigv4'
    require 'base64'
    require 'cgi'
  rescue LoadError => e
    raise AmazonEksDependencyError,
          'Error requiring aws gems. Kubeclient itself does not include the following ' \
          'gems: [aws-sigv4]. To support auth-provider eks, you must ' \
          "include it in your calling application. Failed with: #{e.message}"
  end
  # https://github.com/aws/aws-sdk-ruby/pull/1848
  # Get a signer
  # Note - sts only has ONE endpoint (not regional) so 'us-east-1' hardcoding should be OK
  signer = Aws::Sigv4::Signer.new(
    service: 'sts',
    region: 'us-east-1',
    credentials: credentials
  )

  # https://docs.aws.amazon.com/sdk-for-ruby/v3/api/Aws/Sigv4/Signer.html#presign_url-instance_method
  presigned_url_string = signer.presign_url(
    http_method: 'GET',
    url: 'https://sts.amazonaws.com/?Action=GetCallerIdentity&Version=2011-06-15',
    body: '',
    credentials: credentials,
    expires_in: 60,
    headers: {
      'X-K8s-Aws-Id' => eks_cluster
    }
  )
  kube_token = 'k8s-aws-v1.' + Base64.urlsafe_encode64(presigned_url_string.to_s).sub(/=*$/, '') # rubocop:disable Metrics/LineLength
  kube_token
end