Gem::S3URISigner#ec2_metadata_credentials_json

# File tmp/rubies/ruby-3.4.1/lib/rubygems/s3_uri_signer.rb, line 142
def ec2_metadata_credentials_json
  require_relative "vendored_net_http"
  require_relative "request"
  require_relative "request/connection_pools"
  require "json"

  iam_info = ec2_metadata_request(EC2_IAM_INFO)
  # Expected format: arn:aws:iam::<id>:instance-profile/<role_name>
  role_name = iam_info["InstanceProfileArn"].split("/").last
  ec2_metadata_request(EC2_IAM_SECURITY_CREDENTIALS + role_name)
end