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# frozen_string_literal: true
require 'set'
module Aws
# An auto-refreshing credential provider that works by assuming
# a role via {Aws::STS::Client#assume_role}.
#
# role_credentials = Aws::AssumeRoleCredentials.new(
# client: Aws::STS::Client.new(...),
# role_arn: "linked::account::arn",
# role_session_name: "session-name"
# )
#
# ec2 = Aws::EC2::Client.new(credentials: role_credentials)
#
# If you omit `:client` option, a new {STS::Client} object will be
# constructed.
class AssumeRoleCredentials
include CredentialProvider
include RefreshingCredentials
# @option options [required, String] :role_arn
# @option options [required, String] :role_session_name
# @option options [String] :policy
# @option options [Integer] :duration_seconds
# @option options [String] :external_id
# @option options [STS::Client] :client
def initialize(options = {})
client_opts = {}
@assume_role_params = {}
options.each_pair do |key, value|
if self.class.assume_role_options.include?(key)
@assume_role_params[key] = value
else
client_opts[key] = value
end
end
@client = client_opts[:client] || STS::Client.new(client_opts)
super
end
# @return [STS::Client]
attr_reader :client
private
def refresh
c = @client.assume_role(@assume_role_params).credentials
@credentials = Credentials.new(
c.access_key_id,
c.secret_access_key,
c.session_token
)
@expiration = c.expiration
end
class << self
# @api private
def assume_role_options
@aro ||= begin
input = STS::Client.api.operation(:assume_role).input
Set.new(input.shape.member_names)
end
end
end
end
end
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