rails/activesupport/test/json/decoding_test.rb

# frozen_string_literal: true

require_relative "../abstract_unit"
require "active_support/json"
require "active_support/time"
require_relative "../time_zone_test_helpers"

class TestJSONDecoding < ActiveSupport::TestCase
  include TimeZoneTestHelpers

  class Foo
    def self.json_create(object)
      "Foo"
    end
  end

  TESTS = {
    %q({"returnTo":{"\/categories":"\/"}})        => { "returnTo" => { "/categories" => "/" } },
    %q({"return\\"To\\":":{"\/categories":"\/"}}) => { "return\"To\":" => { "/categories" => "/" } },
    %q({"returnTo":{"\/categories":1}}) => { "returnTo" => { "/categories" => 1 } },
    %({"returnTo":[1,"a"]})                    => { "returnTo" => [1, "a"] },
    %({"returnTo":[1,"\\"a\\",", "b"]})        => { "returnTo" => [1, "\"a\",", "b"] },
    %({"a": "'", "b": "5,000"})                  => { "a" => "'", "b" => "5,000" },
    %({"a": "a's, b's and c's", "b": "5,000"})   => { "a" => "a's, b's and c's", "b" => "5,000" },
    # multibyte
    %({"matzue": "松江", "asakusa": "浅草"}) => { "matzue" => "松江", "asakusa" => "浅草" },
    %({"a": "2007-01-01"})                       => { "a" => Date.new(2007, 1, 1) },
    %({"a": "2007-01-01 01:12:34 Z"})            => { "a" => Time.utc(2007, 1, 1, 1, 12, 34) },
    %(["2007-01-01 01:12:34 Z"])                 => [Time.utc(2007, 1, 1, 1, 12, 34)],
    %(["2007-01-01 01:12:34 Z", "2007-01-01 01:12:35 Z"]) => [Time.utc(2007, 1, 1, 1, 12, 34), Time.utc(2007, 1, 1, 1, 12, 35)],
    # no time zone
    %({"a": "2007-01-01 01:12:34"})              => { "a" => Time.new(2007, 1, 1, 1, 12, 34, "-05:00") },
    # invalid date
    %({"a": "1089-10-40"})                       => { "a" => "1089-10-40" },
    # xmlschema date notation
    %({"a": "2009-08-10T19:01:02"})              => { "a" => Time.new(2009, 8, 10, 19, 1, 2, "-04:00") },
    %({"a": "2009-08-10T19:01:02Z"})             => { "a" => Time.utc(2009, 8, 10, 19, 1, 2) },
    %({"a": "2009-08-10T19:01:02+02:00"})        => { "a" => Time.utc(2009, 8, 10, 17, 1, 2) },
    %({"a": "2009-08-10T19:01:02-05:00"})        => { "a" => Time.utc(2009, 8, 11, 00, 1, 2) },
    # needs to be *exact*
    %({"a": " 2007-01-01 01:12:34 Z "})          => { "a" => " 2007-01-01 01:12:34 Z " },
    %({"a": "2007-01-01 : it's your birthday"})  => { "a" => "2007-01-01 : it's your birthday" },
    %({"a": "Today is:\\n2020-05-21"})           => { "a" => "Today is:\n2020-05-21" },
    %({"a": "2007-01-01 01:12:34 Z\\nwas my birthday"}) => { "a" => "2007-01-01 01:12:34 Z\nwas my birthday" },
    %([])    => [],
    %({})    => {},
    %({"a":1}) => { "a" => 1 },
    %({"a": ""}) => { "a" => "" },
    %({"a":"\\""}) => { "a" => "\"" },
    %({"a": null})  => { "a" => nil },
    %({"a": true})  => { "a" => true },
    %({"a": false}) => { "a" => false },
    '{"bad":"\\\\","trailing":""}' => { "bad" => "\\", "trailing" => "" },
    %q({"a": "http:\/\/test.host\/posts\/1"}) => { "a" => "http://test.host/posts/1" },
    %q({"a": "\u003cunicode\u0020escape\u003e"}) => { "a" => "<unicode escape>" },
    '{"a": "\\\\u0020skip double backslashes"}' => { "a" => "\\u0020skip double backslashes" },
    %q({"a": "\u003cbr /\u003e"}) => { "a" => "<br />" },
    %q({"b":["\u003ci\u003e","\u003cb\u003e","\u003cu\u003e"]}) => { "b" => ["<i>", "<b>", "<u>"] },
    # test combination of dates and escaped or unicode encoded data in arrays
    %q([{"d":"1970-01-01", "s":"\u0020escape"},{"d":"1970-01-01", "s":"\u0020escape"}]) =>
      [{ "d" => Date.new(1970, 1, 1), "s" => " escape" }, { "d" => Date.new(1970, 1, 1), "s" => " escape" }],
    %q([{"d":"1970-01-01","s":"http:\/\/example.com"},{"d":"1970-01-01","s":"http:\/\/example.com"}]) =>
      [{ "d" => Date.new(1970, 1, 1), "s" => "http://example.com" },
       { "d" => Date.new(1970, 1, 1), "s" => "http://example.com" }],
    # tests escaping of "\n" char with Yaml backend
    %q({"a":"\n"}) => { "a" => "\n" },
    %q({"a":"\u000a"}) => { "a" => "\n" },
    %q({"a":"Line1\u000aLine2"}) => { "a" => "Line1\nLine2" },
    # prevent json unmarshalling
    '{"json_class":"TestJSONDecoding::Foo"}' => { "json_class" => "TestJSONDecoding::Foo" },
    # json "fragments" - these are invalid JSON, but ActionPack relies on this
    '"a string"' => "a string",
    "1.1" => 1.1,
    "1" => 1,
    "-1" => -1,
    "true" => true,
    "false" => false,
    "null" => nil
  }

  TESTS.each_with_index do |(json, expected), index|
    fail_message = "JSON decoding failed for #{json}"

    test "json decodes #{index}" do
      with_tz_default "Eastern Time (US & Canada)" do
        with_parse_json_times(true) do
          silence_warnings do
            if expected.nil?
              assert_nil ActiveSupport::JSON.decode(json), fail_message
            else
              assert_equal expected, ActiveSupport::JSON.decode(json), fail_message
            end
          end
        end
      end
    end
  end

  test "json decodes time json with time parsing disabled" do
    with_parse_json_times(false) do
      expected = { "a" => "2007-01-01 01:12:34 Z" }
      assert_equal expected, ActiveSupport::JSON.decode(%({"a": "2007-01-01 01:12:34 Z"}))
    end
  end

  def test_failed_json_decoding
    assert_raise(ActiveSupport::JSON.parse_error) { ActiveSupport::JSON.decode(%(undefined)) }
    assert_raise(ActiveSupport::JSON.parse_error) { ActiveSupport::JSON.decode(%({a: 1})) }
    assert_raise(ActiveSupport::JSON.parse_error) { ActiveSupport::JSON.decode(%({: 1})) }
    assert_raise(ActiveSupport::JSON.parse_error) { ActiveSupport::JSON.decode(%()) }
  end

  def test_cannot_pass_unsupported_options
    assert_raise(ArgumentError) { ActiveSupport::JSON.decode("", create_additions: true) }
  end

  private
    def with_parse_json_times(value)
      old_value = ActiveSupport.parse_json_times
      ActiveSupport.parse_json_times = value
      yield
    ensure
      ActiveSupport.parse_json_times = old_value
    end
end