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#
# Author:: Tim Hinderliter (<tim@opscode.com>)
# Copyright:: Copyright (c) 2010 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License 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.
# Wrapper class for interacting with JSON.
require "ffi_yajl"
require "chef/exceptions"
# We're requiring this to prevent breaking consumers using Hash.to_json
require "json"
class Chef
class JSONCompat
JSON_MAX_NESTING = 1000
JSON_CLASS = "json_class".freeze
CHEF_APICLIENT = "Chef::ApiClient".freeze
CHEF_CHECKSUM = "Chef::Checksum".freeze
CHEF_COOKBOOKVERSION = "Chef::CookbookVersion".freeze
CHEF_DATABAG = "Chef::DataBag".freeze
CHEF_DATABAGITEM = "Chef::DataBagItem".freeze
CHEF_ENVIRONMENT = "Chef::Environment".freeze
CHEF_NODE = "Chef::Node".freeze
CHEF_ROLE = "Chef::Role".freeze
CHEF_SANDBOX = "Chef::Sandbox".freeze
CHEF_RESOURCE = "Chef::Resource".freeze
CHEF_RESOURCECOLLECTION = "Chef::ResourceCollection".freeze
CHEF_RESOURCESET = "Chef::ResourceCollection::ResourceSet".freeze
CHEF_RESOURCELIST = "Chef::ResourceCollection::ResourceList".freeze
CHEF_RUNLISTEXPANSION = "Chef::RunListExpansion".freeze
class <<self
# API to use to avoid create_addtions
def parse(source, opts = {})
begin
FFI_Yajl::Parser.parse(source, opts)
rescue FFI_Yajl::ParseError => e
raise Chef::Exceptions::JSON::ParseError, e.message
end
end
# Just call the JSON gem's parse method with a modified :max_nesting field
def from_json(source, opts = {})
obj = parse(source, opts)
# JSON gem requires top level object to be a Hash or Array (otherwise
# you get the "must contain two octets" error). Yajl doesn't impose the
# same limitation. For compatibility, we re-impose this condition.
unless obj.kind_of?(Hash) or obj.kind_of?(Array)
raise Chef::Exceptions::JSON::ParseError, "Top level JSON object must be a Hash or Array. (actual: #{obj.class})"
end
# The old default in the json gem (which we are mimicing because we
# sadly rely on this misfeature) is to "create additions" i.e., convert
# JSON objects into ruby objects. Explicit :create_additions => false
# is required to turn it off.
if opts[:create_additions].nil? || opts[:create_additions]
map_to_rb_obj(obj)
else
obj
end
end
# Look at an object that's a basic type (from json parse) and convert it
# to an instance of Chef classes if desired.
def map_to_rb_obj(json_obj)
case json_obj
when Hash
mapped_hash = map_hash_to_rb_obj(json_obj)
if json_obj.has_key?(JSON_CLASS) && (class_to_inflate = class_for_json_class(json_obj[JSON_CLASS]))
class_to_inflate.json_create(mapped_hash)
else
mapped_hash
end
when Array
json_obj.map {|e| map_to_rb_obj(e) }
else
json_obj
end
end
def map_hash_to_rb_obj(json_hash)
json_hash.each do |key, value|
json_hash[key] = map_to_rb_obj(value)
end
json_hash
end
def to_json(obj, opts = nil)
begin
FFI_Yajl::Encoder.encode(obj, opts)
rescue FFI_Yajl::EncodeError => e
raise Chef::Exceptions::JSON::EncodeError, e.message
end
end
def to_json_pretty(obj, opts = nil)
opts ||= {}
options_map = {}
options_map[:pretty] = true
options_map[:indent] = opts[:indent] if opts.has_key?(:indent)
to_json(obj, options_map).chomp
end
# Map +json_class+ to a Class object. We use a +case+ instead of a Hash
# assigned to a constant because otherwise this file could not be loaded
# until all the constants were defined, which means you'd have to load
# the world to get json, which would make knife very slow.
def class_for_json_class(json_class)
case json_class
when CHEF_APICLIENT
Chef::ApiClient
when CHEF_CHECKSUM
Chef::Checksum
when CHEF_COOKBOOKVERSION
Chef::CookbookVersion
when CHEF_DATABAG
Chef::DataBag
when CHEF_DATABAGITEM
Chef::DataBagItem
when CHEF_ENVIRONMENT
Chef::Environment
when CHEF_NODE
Chef::Node
when CHEF_ROLE
Chef::Role
when CHEF_SANDBOX
# a falsey return here will disable object inflation/"create
# additions" in the caller. In Chef 11 this is correct, we just have
# a dummy Chef::Sandbox class for compat with Chef 10 servers.
false
when CHEF_RESOURCE
Chef::Resource
when CHEF_RESOURCECOLLECTION
Chef::ResourceCollection
when CHEF_RESOURCESET
Chef::ResourceCollection::ResourceSet
when CHEF_RESOURCELIST
Chef::ResourceCollection::ResourceList
when /^Chef::Resource/
Chef::Resource.find_descendants_by_name(json_class)
else
raise Chef::Exceptions::JSON::ParseError, "Unsupported `json_class` type '#{json_class}'"
end
end
end
end
end
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