[ec2] - add modify_snapshot_attribute call

lib/fog/aws/ec2.rb

@@ -1,4 +1,4 @@
-module Fog
+	module Fog
   module AWS
     module EC2
       extend Fog::Service
@@ -54,6 +54,7 @@ module Fog
       request 'disassociate_address'
       request 'get_console_output'
       request 'modify_image_attributes'
+      request 'modify_snapshot_attribute'
       request 'reboot_instances'
       request 'release_address'
       request 'revoke_security_group_ingress'

lib/fog/aws/requests/ec2/modify_snapshot_attribute.rb

@@ -0,0 +1,38 @@
+module Fog
+  module AWS
+    module EC2
+      class Real
+
+        # Modify snapshot attributes
+        #
+        # ==== Parameters
+        # * snapshot_id<~String> - Id of snapshot to modify
+        # * attribute<~String> - Attribute to modify, in ['createVolumePermission']
+        # * operation_type<~String> - Operation to perform on attribute, in ['add', 'remove']
+        #
+        def modify_snapshot_attribute(snapshot_id, attribute, operation_type, options = {})
+          params = {}
+          params.merge!(AWS.indexed_param('UserId', options['UserId']))
+          params.merge!(AWS.indexed_param('UserGroup', options['UserGroup']))
+          request({
+            'Action'        => 'ModifySnapshotAttribute',
+            'Attribute'     => attribute,
+            'SnapshotId'    => snapshot_id,
+            'OperationType' => operation_type,
+            :idempotent     => true,
+            :parser         => Fog::Parsers::AWS::EC2::Basic.new
+          }.merge!(params))
+        end
+
+      end
+
+      class Mock
+
+        def modify_snapshot_attribute(snapshot_id, attribute, operation_type, options = {})
+          Fog::Mock.not_implemented
+        end
+
+      end
+    end
+  end
+end