+
+ def foreign_key_attributes
+ attributes.keys.select { |a| a.match /_uuid$/ }
+ end
+
+ def skip_uuid_read_permission_check
+ %w(modified_by_client_uuid)
+ end
+
+ def skip_uuid_existence_check
+ []
+ end
+
+ def normalize_collection_uuids
+ foreign_key_attributes.each do |attr|
+ attr_value = send attr
+ if attr_value.is_a? String and
+ attr_value.match /^[0-9a-f]{32,}(\+[@\w]+)*$/
+ begin
+ send "#{attr}=", Collection.normalize_uuid(attr_value)
+ rescue
+ # TODO: abort instead of silently accepting unnormalizable value?
+ end
+ end
+ end
+ end
+
+ @@UUID_REGEX = /^[0-9a-z]{5}-([0-9a-z]{5})-[0-9a-z]{15}$/
+
+ @@prefixes_hash = nil
+ def self.uuid_prefixes
+ unless @@prefixes_hash
+ @@prefixes_hash = {}
+ ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |k|
+ if k.respond_to?(:uuid_prefix)
+ @@prefixes_hash[k.uuid_prefix] = k
+ end
+ end
+ end
+ @@prefixes_hash
+ end
+
+ def self.uuid_like_pattern
+ "_____-#{uuid_prefix}-_______________"
+ end
+
+ def ensure_valid_uuids
+ specials = [system_user_uuid, 'd41d8cd98f00b204e9800998ecf8427e+0']
+
+ foreign_key_attributes.each do |attr|
+ if new_record? or send (attr + "_changed?")
+ next if skip_uuid_existence_check.include? attr
+ attr_value = send attr
+ next if specials.include? attr_value
+ if attr_value
+ if (r = ArvadosModel::resource_class_for_uuid attr_value)
+ unless skip_uuid_read_permission_check.include? attr
+ r = r.readable_by(current_user)
+ end
+ if r.where(uuid: attr_value).count == 0
+ errors.add(attr, "'#{attr_value}' not found")
+ end
+ end
+ end
+ end
+ end
+ end
+
+ class Email
+ def self.kind
+ "email"
+ end
+
+ def kind
+ self.class.kind
+ end
+
+ def self.readable_by (u)
+ self
+ end
+
+ def self.where (u)
+ [{:uuid => u[:uuid]}]
+ end
+ end
+
+ def self.resource_class_for_uuid(uuid)
+ if uuid.is_a? ArvadosModel
+ return uuid.class
+ end
+ unless uuid.is_a? String
+ return nil
+ end
+ if uuid.match /^[0-9a-f]{32}(\+[^,]+)*(,[0-9a-f]{32}(\+[^,]+)*)*$/
+ return Collection
+ end
+ resource_class = nil
+
+ Rails.application.eager_load!
+ uuid.match @@UUID_REGEX do |re|
+ return uuid_prefixes[re[1]] if uuid_prefixes[re[1]]
+ end
+
+ if uuid.match /.+@.+/
+ return Email
+ end
+
+ nil
+ end
+
+ def log_start_state
+ @old_etag = etag
+ @old_attributes = logged_attributes
+ end
+
+ def log_change(event_type)
+ log = Log.new(event_type: event_type).fill_object(self)
+ yield log
+ log.save!
+ connection.execute "NOTIFY logs, '#{log.id}'"
+ log_start_state
+ end
+
+ def log_create
+ log_change('create') do |log|
+ log.fill_properties('old', nil, nil)
+ log.update_to self
+ end
+ end
+
+ def log_update
+ log_change('update') do |log|
+ log.fill_properties('old', @old_etag, @old_attributes)
+ log.update_to self
+ end
+ end
+
+ def log_destroy
+ log_change('destroy') do |log|
+ log.fill_properties('old', @old_etag, @old_attributes)
+ log.update_to nil
+ end
+ end