diff options
Diffstat (limited to 'activesupport/lib/active_support/json/encoding.rb')
| -rw-r--r-- | activesupport/lib/active_support/json/encoding.rb | 270 |
1 files changed, 25 insertions, 245 deletions
diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb index 77b5d8d227..0e1c379b5b 100644 --- a/activesupport/lib/active_support/json/encoding.rb +++ b/activesupport/lib/active_support/json/encoding.rb @@ -1,19 +1,8 @@ #encoding: us-ascii -require 'active_support/core_ext/object/to_json' +require 'active_support/core_ext/object/json' require 'active_support/core_ext/module/delegation' -require 'bigdecimal' -require 'active_support/core_ext/big_decimal/conversions' # for #to_s -require 'active_support/core_ext/hash/except' -require 'active_support/core_ext/hash/slice' -require 'active_support/core_ext/object/instance_variables' -require 'time' -require 'active_support/core_ext/time/conversions' -require 'active_support/core_ext/date_time/conversions' -require 'active_support/core_ext/date/conversions' -require 'set' - module ActiveSupport class << self delegate :use_standard_json_time_format, :use_standard_json_time_format=, @@ -23,9 +12,6 @@ module ActiveSupport end module JSON - # matches YAML-formatted dates - DATE_REGEX = /^(?:\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[T \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?))$/ - # Dumps objects in JSON (JavaScript Object Notation). # See www.json.org for more info. # @@ -36,56 +22,22 @@ module ActiveSupport end module Encoding #:nodoc: - class CircularReferenceError < StandardError; end - class Encoder attr_reader :options def initialize(options = nil) @options = options || {} - @seen = Set.new end - def encode(value, use_options = true) - check_for_circular_references(value) do - jsonified = use_options ? value.as_json(options_for(value)) : value.as_json - jsonified.encode_json(self) - end - end - - # like encode, but only calls as_json, without encoding to string. - def as_json(value, use_options = true) - check_for_circular_references(value) do - use_options ? value.as_json(options_for(value)) : value.as_json - end - end - - def options_for(value) - if value.is_a?(Array) || value.is_a?(Hash) - # hashes and arrays need to get encoder in the options, so that - # they can detect circular references. - options.merge(:encoder => self) - else - options.dup - end + def encode(value) + value.as_json(options.dup).encode_json(self) end def escape(string) Encoding.escape(string) end - - private - def check_for_circular_references(value) - unless @seen.add?(value.__id__) - raise CircularReferenceError, 'object references itself' - end - yield - ensure - @seen.delete(value.__id__) - end end - ESCAPED_CHARS = { "\x00" => '\u0000', "\x01" => '\u0001', "\x02" => '\u0002', "\x03" => '\u0003', "\x04" => '\u0004', "\x05" => '\u0005', @@ -140,6 +92,28 @@ module ActiveSupport json.force_encoding(::Encoding::UTF_8) json end + + # Deprecate CircularReferenceError + def const_missing(name) + if name == :CircularReferenceError + message = "The JSON encoder in Rails 4.1 no longer offers protection from circular references. " \ + "You are seeing this warning because you are rescuing from (or otherwise referencing) " \ + "ActiveSupport::Encoding::CircularReferenceError. In the future, this error will be " \ + "removed from Rails. You should remove these rescue blocks from your code and ensure " \ + "that your data structures are free of circular references so they can be properly " \ + "serialized into JSON.\n\n" \ + "For example, the following Hash contains a circular reference to itself:\n" \ + " h = {}\n" \ + " h['circular'] = h\n" \ + "In this case, calling h.to_json would not work properly." + + ActiveSupport::Deprecation.warn message + + SystemStackError + else + super + end + end end self.use_standard_json_time_format = true @@ -148,197 +122,3 @@ module ActiveSupport end end end - -class Object - def as_json(options = nil) #:nodoc: - if respond_to?(:to_hash) - to_hash - else - instance_values - end - end -end - -class Struct #:nodoc: - def as_json(options = nil) - Hash[members.zip(values)] - end -end - -class TrueClass - def as_json(options = nil) #:nodoc: - self - end - - def encode_json(encoder) #:nodoc: - to_s - end -end - -class FalseClass - def as_json(options = nil) #:nodoc: - self - end - - def encode_json(encoder) #:nodoc: - to_s - end -end - -class NilClass - def as_json(options = nil) #:nodoc: - self - end - - def encode_json(encoder) #:nodoc: - 'null' - end -end - -class String - def as_json(options = nil) #:nodoc: - self - end - - def encode_json(encoder) #:nodoc: - encoder.escape(self) - end -end - -class Symbol - def as_json(options = nil) #:nodoc: - to_s - end -end - -class Numeric - def as_json(options = nil) #:nodoc: - self - end - - def encode_json(encoder) #:nodoc: - to_s - end -end - -class Float - # Encoding Infinity or NaN to JSON should return "null". The default returns - # "Infinity" or "NaN" which breaks parsing the JSON. E.g. JSON.parse('[NaN]'). - def as_json(options = nil) #:nodoc: - finite? ? self : nil - end -end - -class BigDecimal - # A BigDecimal would be naturally represented as a JSON number. Most libraries, - # however, parse non-integer JSON numbers directly as floats. Clients using - # those libraries would get in general a wrong number and no way to recover - # other than manually inspecting the string with the JSON code itself. - # - # That's why a JSON string is returned. The JSON literal is not numeric, but - # if the other end knows by contract that the data is supposed to be a - # BigDecimal, it still has the chance to post-process the string and get the - # real value. - # - # Use <tt>ActiveSupport.use_standard_json_big_decimal_format = true</tt> to - # override this behavior. - def as_json(options = nil) #:nodoc: - if finite? - ActiveSupport.encode_big_decimal_as_string ? to_s : self - else - nil - end - end -end - -class Regexp - def as_json(options = nil) #:nodoc: - to_s - end -end - -module Enumerable - def as_json(options = nil) #:nodoc: - to_a.as_json(options) - end -end - -class Range - def as_json(options = nil) #:nodoc: - to_s - end -end - -class Array - def as_json(options = nil) #:nodoc: - # use encoder as a proxy to call as_json on all elements, to protect from circular references - encoder = options && options[:encoder] || ActiveSupport::JSON::Encoding::Encoder.new(options) - map { |v| encoder.as_json(v, options) } - end - - def encode_json(encoder) #:nodoc: - # we assume here that the encoder has already run as_json on self and the elements, so we run encode_json directly - "[#{map { |v| v.encode_json(encoder) } * ','}]" - end -end - -class Hash - def as_json(options = nil) #:nodoc: - # create a subset of the hash by applying :only or :except - subset = if options - if attrs = options[:only] - slice(*Array(attrs)) - elsif attrs = options[:except] - except(*Array(attrs)) - else - self - end - else - self - end - - # use encoder as a proxy to call as_json on all values in the subset, to protect from circular references - encoder = options && options[:encoder] || ActiveSupport::JSON::Encoding::Encoder.new(options) - Hash[subset.map { |k, v| [k.to_s, encoder.as_json(v, options)] }] - end - - def encode_json(encoder) #:nodoc: - # values are encoded with use_options = false, because we don't want hash representations from ActiveModel to be - # processed once again with as_json with options, as this could cause unexpected results (i.e. missing fields); - - # on the other hand, we need to run as_json on the elements, because the model representation may contain fields - # like Time/Date in their original (not jsonified) form, etc. - - "{#{map { |k,v| "#{encoder.encode(k.to_s)}:#{encoder.encode(v, false)}" } * ','}}" - end -end - -class Time - def as_json(options = nil) #:nodoc: - if ActiveSupport.use_standard_json_time_format - xmlschema - else - %(#{strftime("%Y/%m/%d %H:%M:%S")} #{formatted_offset(false)}) - end - end -end - -class Date - def as_json(options = nil) #:nodoc: - if ActiveSupport.use_standard_json_time_format - strftime("%Y-%m-%d") - else - strftime("%Y/%m/%d") - end - end -end - -class DateTime - def as_json(options = nil) #:nodoc: - if ActiveSupport.use_standard_json_time_format - xmlschema - else - strftime('%Y/%m/%d %H:%M:%S %z') - end - end -end |