146 lines
4.6 KiB
Ruby
146 lines
4.6 KiB
Ruby
# Copyright 2015 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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require 'representable/json'
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require 'representable/json/hash'
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require 'base64'
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require 'date'
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module Google
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module Apis
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module Core
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# Support for serializing hashes + propery value/nil/unset tracking
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# To be included in representers as a feature.
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# @private
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module JsonRepresentationSupport
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def self.included(base)
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base.extend(JsonSupport)
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end
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# @private
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module JsonSupport
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# Returns a customized getter function for Representable. Allows
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# indifferent hash/attribute access.
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#
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# @param [String] name Property name
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# @return [Proc]
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def getter_fn(name)
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ivar_name = "@#{name}".to_sym
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lambda do |_|
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if respond_to?(:fetch)
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fetch(name, instance_variable_get(ivar_name))
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else
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instance_variable_get(ivar_name)
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end
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end
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end
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# Returns a customized function for Representable that checks whether or not
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# an attribute should be serialized. Allows proper patch semantics by distinguishing
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# between nil & unset values
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#
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# @param [String] name Property name
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# @return [Proc]
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def if_fn(name)
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ivar_name = "@#{name}".to_sym
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lambda do |opts|
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if opts[:skip_undefined]
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if respond_to?(:key?)
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self.key?(name) || instance_variable_defined?(ivar_name)
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else
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instance_variable_defined?(ivar_name)
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end
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else
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true
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end
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end
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end
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def set_default_options(name, options)
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if options[:base64]
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options[:render_filter] = ->(value, _doc, *_args) { value.nil? ? nil : Base64.urlsafe_encode64(value) }
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options[:parse_filter] = ->(fragment, _doc, *_args) { Base64.urlsafe_decode64(fragment) }
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end
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if options[:type] == DateTime
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options[:render_filter] = ->(value, _doc, *_args) { value.nil? ? nil : value.is_a?(DateTime) ? value.rfc3339(3) : value.to_s }
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options[:parse_filter] = ->(fragment, _doc, *_args) { DateTime.parse(fragment) }
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end
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options[:render_nil] = true
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options[:getter] = getter_fn(name)
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options[:if] = if_fn(name)
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end
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# Define a single value property
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#
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# @param [String] name
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# Property name
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# @param [Hash] options
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def property(name, options = {})
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set_default_options(name, options)
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super(name, options)
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end
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# Define a collection property
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#
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# @param [String] name
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# Property name
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# @param [Hash] options
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def collection(name, options = {})
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set_default_options(name, options)
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super(name, options)
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end
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# Define a hash property
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#
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# @param [String] name
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# Property name
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# @param [Hash] options
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def hash(name = nil, options = nil)
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return super() unless name # Allow Object.hash
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set_default_options(name, options)
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super(name, options)
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end
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end
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end
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# Base decorator for JSON representers
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#
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# @see https://github.com/apotonick/representable
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class JsonRepresentation < Representable::Decorator
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include Representable::JSON
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feature JsonRepresentationSupport
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end
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module JsonObjectSupport
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def self.included(base)
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base.extend(ClassMethods)
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end
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module ClassMethods
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def from_json(json)
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representation = self.const_get(:Representation)
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representation.new(self.new).from_json(json, unwrap: self)
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end
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end
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def to_json
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representation = self.class.const_get(:Representation)
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representation.new(self).to_json(skip_undefined: true)
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end
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end
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end
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end
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end
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