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# Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"). You
# may not use this file except in compliance with the License. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
# ANY KIND, either express or implied. See the License for the specific
# language governing permissions and limitations under the License.
module AWS
class EC2
# Represents the collection of permissions for an EC2 resource.
# Each permission is a string containing the AWS account ID of a
# user who has permission to use the resource in question. The
# {Image} and {Snapshot} classes are currently the only ones
# that use this interface.
class PermissionCollection
include Core::Model
include Enumerable
# @api private
def initialize(resource, opts = {})
@resource = resource
super(opts)
end
# @yield [user_id] Each user ID that has explicit
# permissions to launch this AMI.
def each(&block)
resp = client.send(describe_call, describe_params)
resp.send(inflected_permissions_attribute).each do |permission|
if permission[:user_id]
user_id = permission[:user_id]
yield(user_id)
end
end
end
# @return [Integer] The number of users that have explicit
# permissions to launch this AMI.
def size
inject(0) { |sum, i| sum + 1 }
end
# @return [Boolean] True if the collection is empty.
def empty?
size == 0
end
# @return [Boolean] True if the resource is public.
def public?
resp = client.send(describe_call, describe_params)
resp.send(inflected_permissions_attribute).any? do |permission|
permission[:group] and permission[:group] == "all"
end
end
# @return [Boolean] True if the resource is private (i.e. not
# public).
def private?
!public?
end
# Sets whether the resource is public or not. This has no
# effect on the explicit AWS account IDs that may already have
# permissions to use the resource.
#
# @param [Boolean] value If true, the resource is made public,
# otherwise the resource is made private.
# @return [nil]
def public= value
params = value ?
{ :add => [{ :group => "all" }] } :
{ :remove => [{ :group => "all" }] }
client.send(modify_call, modify_params(params))
nil
end
# Adds permissions for specific users to launch this AMI.
#
# @param [Array of Strings] users The AWS account IDs of the
# users that should be able to launch this AMI.
# @return [nil]
def add(*users)
modify(:add, *users)
end
# Removes permissions for specific users to launch this AMI.
# @param [Array of Strings] users The AWS account IDs of the
# users that should no longer be able to launch this AMI.
# @return [nil]
def remove(*users)
modify(:remove, *users)
end
# Resets the launch permissions to their default state.
# @return [nil]
def reset
client.send(reset_call, reset_params)
end
# @api private
private
def describe_call
"describe_#{resource_name}_attribute"
end
# @api private
private
def modify_call
"modify_#{resource_name}_attribute"
end
# @api private
private
def reset_call
"reset_#{resource_name}_attribute"
end
# @api private
private
def describe_params
Hash[[["#{resource_name}_id".to_sym, @resource.send(:__resource_id__)],
[:attribute, permissions_attribute]]]
end
alias_method :reset_params, :describe_params
# @api private
private
def inflected_permissions_attribute
Core::Inflection.ruby_name(permissions_attribute).to_sym
end
# @api private
private
def permissions_attribute
@resource.__permissions_attribute__
end
# @api private
private
def resource_name
@resource.send(:inflected_name)
end
# @api private
private
def modify(action, *users)
return if users.empty?
opts = modify_params(Hash[[[action,
users.map do |user_id|
{ :user_id => user_id }
end]]])
client.send(modify_call, opts)
nil
end
# @api private
private
def modify_params(modifications)
Hash[[["#{resource_name}_id".to_sym, @resource.send(:__resource_id__)],
[inflected_permissions_attribute, modifications]]]
end
end
end
end
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