diff options
Diffstat (limited to 'activesupport/lib/active_support/json')
-rw-r--r-- | activesupport/lib/active_support/json/decoding.rb | 76 | ||||
-rw-r--r-- | activesupport/lib/active_support/json/encoding.rb | 134 |
2 files changed, 210 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/json/decoding.rb b/activesupport/lib/active_support/json/decoding.rb new file mode 100644 index 0000000000..402a3fbe60 --- /dev/null +++ b/activesupport/lib/active_support/json/decoding.rb @@ -0,0 +1,76 @@ +# frozen_string_literal: true + +require "active_support/core_ext/module/attribute_accessors" +require "active_support/core_ext/module/delegation" +require "json" + +module ActiveSupport + # Look for and parse json strings that look like ISO 8601 times. + mattr_accessor :parse_json_times + + module JSON + # matches YAML-formatted dates + DATE_REGEX = /^\d{4}-\d{2}-\d{2}$/ + DATETIME_REGEX = /^(?:\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[T \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?)$/ + + class << self + # Parses a JSON string (JavaScript Object Notation) into a hash. + # See http://www.json.org for more info. + # + # ActiveSupport::JSON.decode("{\"team\":\"rails\",\"players\":\"36\"}") + # => {"team" => "rails", "players" => "36"} + def decode(json) + data = ::JSON.parse(json, quirks_mode: true) + + if ActiveSupport.parse_json_times + convert_dates_from(data) + else + data + end + end + + # Returns the class of the error that will be raised when there is an + # error in decoding JSON. Using this method means you won't directly + # depend on the ActiveSupport's JSON implementation, in case it changes + # in the future. + # + # begin + # obj = ActiveSupport::JSON.decode(some_string) + # rescue ActiveSupport::JSON.parse_error + # Rails.logger.warn("Attempted to decode invalid JSON: #{some_string}") + # end + def parse_error + ::JSON::ParserError + end + + private + + def convert_dates_from(data) + case data + when nil + nil + when DATE_REGEX + begin + Date.parse(data) + rescue ArgumentError + data + end + when DATETIME_REGEX + begin + Time.zone.parse(data) + rescue ArgumentError + data + end + when Array + data.map! { |d| convert_dates_from(d) } + when Hash + data.each do |key, value| + data[key] = convert_dates_from(value) + end + else + data + end + end + end + end +end diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb new file mode 100644 index 0000000000..de1b8ac8cf --- /dev/null +++ b/activesupport/lib/active_support/json/encoding.rb @@ -0,0 +1,134 @@ +# frozen_string_literal: true + +require "active_support/core_ext/object/json" +require "active_support/core_ext/module/delegation" + +module ActiveSupport + class << self + delegate :use_standard_json_time_format, :use_standard_json_time_format=, + :time_precision, :time_precision=, + :escape_html_entities_in_json, :escape_html_entities_in_json=, + :json_encoder, :json_encoder=, + to: :'ActiveSupport::JSON::Encoding' + end + + module JSON + # Dumps objects in JSON (JavaScript Object Notation). + # See http://www.json.org for more info. + # + # ActiveSupport::JSON.encode({ team: 'rails', players: '36' }) + # # => "{\"team\":\"rails\",\"players\":\"36\"}" + def self.encode(value, options = nil) + Encoding.json_encoder.new(options).encode(value) + end + + module Encoding #:nodoc: + class JSONGemEncoder #:nodoc: + attr_reader :options + + def initialize(options = nil) + @options = options || {} + end + + # Encode the given object into a JSON string + def encode(value) + stringify jsonify value.as_json(options.dup) + end + + private + # Rails does more escaping than the JSON gem natively does (we + # escape \u2028 and \u2029 and optionally >, <, & to work around + # certain browser problems). + ESCAPED_CHARS = { + "\u2028" => '\u2028', + "\u2029" => '\u2029', + ">" => '\u003e', + "<" => '\u003c', + "&" => '\u0026', + } + + ESCAPE_REGEX_WITH_HTML_ENTITIES = /[\u2028\u2029><&]/u + ESCAPE_REGEX_WITHOUT_HTML_ENTITIES = /[\u2028\u2029]/u + + # This class wraps all the strings we see and does the extra escaping + class EscapedString < String #:nodoc: + def to_json(*) + if Encoding.escape_html_entities_in_json + s = super + s.gsub! ESCAPE_REGEX_WITH_HTML_ENTITIES, ESCAPED_CHARS + s + else + s = super + s.gsub! ESCAPE_REGEX_WITHOUT_HTML_ENTITIES, ESCAPED_CHARS + s + end + end + + def to_s + self + end + end + + # Mark these as private so we don't leak encoding-specific constructs + private_constant :ESCAPED_CHARS, :ESCAPE_REGEX_WITH_HTML_ENTITIES, + :ESCAPE_REGEX_WITHOUT_HTML_ENTITIES, :EscapedString + + # Convert an object into a "JSON-ready" representation composed of + # primitives like Hash, Array, String, Numeric, + # and +true+/+false+/+nil+. + # Recursively calls #as_json to the object to recursively build a + # fully JSON-ready object. + # + # This allows developers to implement #as_json without having to + # worry about what base types of objects they are allowed to return + # or having to remember to call #as_json recursively. + # + # Note: the +options+ hash passed to +object.to_json+ is only passed + # to +object.as_json+, not any of this method's recursive +#as_json+ + # calls. + def jsonify(value) + case value + when String + EscapedString.new(value) + when Numeric, NilClass, TrueClass, FalseClass + value.as_json + when Hash + Hash[value.map { |k, v| [jsonify(k), jsonify(v)] }] + when Array + value.map { |v| jsonify(v) } + else + jsonify value.as_json + end + end + + # Encode a "jsonified" Ruby data structure using the JSON gem + def stringify(jsonified) + ::JSON.generate(jsonified, quirks_mode: true, max_nesting: false) + end + end + + class << self + # If true, use ISO 8601 format for dates and times. Otherwise, fall back + # to the Active Support legacy format. + attr_accessor :use_standard_json_time_format + + # If true, encode >, <, & as escaped unicode sequences (e.g. > as \u003e) + # as a safety measure. + attr_accessor :escape_html_entities_in_json + + # Sets the precision of encoded time values. + # Defaults to 3 (equivalent to millisecond precision) + attr_accessor :time_precision + + # Sets the encoder used by Rails to encode Ruby objects into JSON strings + # in +Object#to_json+ and +ActiveSupport::JSON.encode+. + attr_accessor :json_encoder + end + + self.use_standard_json_time_format = true + self.escape_html_entities_in_json = true + self.json_encoder = JSONGemEncoder + self.time_precision = 3 + end + end +end |