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schema.rb
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schema.rb
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# frozen_string_literal: true
module JSONSchemer
class Schema
Context = Struct.new(:instance, :dynamic_scope, :adjacent_results, :short_circuit, :access_mode) do
def original_instance(instance_location)
Hana::Pointer.parse(Location.resolve(instance_location)).reduce(instance) do |obj, token|
if obj.is_a?(Array)
obj.fetch(token.to_i)
elsif !obj.key?(token) && obj.key?(token.to_sym)
obj.fetch(token.to_sym)
else
obj.fetch(token)
end
end
end
end
include Output
DEFAULT_SCHEMA = Draft202012::BASE_URI.to_s.freeze
SCHEMA_KEYWORD_CLASS = Draft202012::Vocab::Core::Schema
VOCABULARY_KEYWORD_CLASS = Draft202012::Vocab::Core::Vocabulary
ID_KEYWORD_CLASS = Draft202012::Vocab::Core::Id
UNKNOWN_KEYWORD_CLASS = Draft202012::Vocab::Core::UnknownKeyword
NOT_KEYWORD_CLASS = Draft202012::Vocab::Applicator::Not
PROPERTIES_KEYWORD_CLASS = Draft202012::Vocab::Applicator::Properties
DEFAULT_BASE_URI = URI('json-schemer://schema').freeze
DEFAULT_FORMATS = {}.freeze
DEFAULT_CONTENT_ENCODINGS = {}.freeze
DEFAULT_CONTENT_MEDIA_TYPES = {}.freeze
DEFAULT_KEYWORDS = {}.freeze
DEFAULT_BEFORE_PROPERTY_VALIDATION = [].freeze
DEFAULT_AFTER_PROPERTY_VALIDATION = [].freeze
DEFAULT_REF_RESOLVER = proc { |uri| raise UnknownRef, uri.to_s }
NET_HTTP_REF_RESOLVER = proc { |uri| JSON.parse(Net::HTTP.get(uri)) }
RUBY_REGEXP_RESOLVER = proc { |pattern| Regexp.new(pattern) }
ECMA_REGEXP_RESOLVER = proc { |pattern| Regexp.new(EcmaRegexp.ruby_equivalent(pattern)) }
DEFAULT_PROPERTY_DEFAULT_RESOLVER = proc do |instance, property, results_with_tree_validity|
results_with_tree_validity = results_with_tree_validity.select(&:last) unless results_with_tree_validity.size == 1
annotations = results_with_tree_validity.to_set { |result, _tree_valid| result.annotation }
if annotations.size == 1
instance[property] = annotations.first.clone
true
else
false
end
end
attr_accessor :base_uri, :meta_schema, :keywords, :keyword_order
attr_reader :value, :parent, :root, :parsed
attr_reader :vocabulary, :format, :formats, :content_encodings, :content_media_types, :custom_keywords, :before_property_validation, :after_property_validation, :insert_property_defaults, :property_default_resolver
def initialize(
value,
parent = nil,
root = self,
keyword = nil,
base_uri: DEFAULT_BASE_URI,
meta_schema: nil,
vocabulary: nil,
format: true,
formats: DEFAULT_FORMATS,
content_encodings: DEFAULT_CONTENT_ENCODINGS,
content_media_types: DEFAULT_CONTENT_MEDIA_TYPES,
keywords: DEFAULT_KEYWORDS,
before_property_validation: DEFAULT_BEFORE_PROPERTY_VALIDATION,
after_property_validation: DEFAULT_AFTER_PROPERTY_VALIDATION,
insert_property_defaults: false,
property_default_resolver: DEFAULT_PROPERTY_DEFAULT_RESOLVER,
ref_resolver: DEFAULT_REF_RESOLVER,
regexp_resolver: 'ruby',
output_format: 'classic',
resolve_enumerators: false,
access_mode: nil
)
@value = deep_stringify_keys(value)
@parent = parent
@root = root
@keyword = keyword
@schema = self
@base_uri = base_uri
@meta_schema = meta_schema
@vocabulary = vocabulary
@format = format
@formats = formats
@content_encodings = content_encodings
@content_media_types = content_media_types
@custom_keywords = keywords
@before_property_validation = Array(before_property_validation)
@after_property_validation = Array(after_property_validation)
@insert_property_defaults = insert_property_defaults
@property_default_resolver = property_default_resolver
@original_ref_resolver = ref_resolver
@original_regexp_resolver = regexp_resolver
@output_format = output_format
@resolve_enumerators = resolve_enumerators
@access_mode = access_mode
@parsed = parse
end
def valid?(instance, **options)
validate(instance, :output_format => 'flag', **options).fetch('valid')
end
def validate(instance, output_format: @output_format, resolve_enumerators: @resolve_enumerators, access_mode: @access_mode)
instance_location = Location.root
context = Context.new(instance, [], nil, (!insert_property_defaults && output_format == 'flag'), access_mode)
result = validate_instance(deep_stringify_keys(instance), instance_location, root_keyword_location, context)
if insert_property_defaults && result.insert_property_defaults(context, &property_default_resolver)
result = validate_instance(deep_stringify_keys(instance), instance_location, root_keyword_location, context)
end
output = result.output(output_format)
resolve_enumerators!(output) if resolve_enumerators
output
end
def valid_schema?
meta_schema.valid?(value)
end
def validate_schema
meta_schema.validate(value)
end
def ref(value)
root.resolve_ref(URI.join(base_uri, value))
end
def validate_instance(instance, instance_location, keyword_location, context)
context.dynamic_scope.push(self)
original_adjacent_results = context.adjacent_results
adjacent_results = context.adjacent_results = {}
short_circuit = context.short_circuit
begin
return result(instance, instance_location, keyword_location, false) if value == false
return result(instance, instance_location, keyword_location, true) if value == true || value.empty?
valid = true
nested = []
parsed.each do |keyword, keyword_instance|
next unless keyword_result = keyword_instance.validate(instance, instance_location, join_location(keyword_location, keyword), context)
valid &&= keyword_result.valid
return result(instance, instance_location, keyword_location, false) if short_circuit && !valid
nested << keyword_result
adjacent_results[keyword_instance.class] = keyword_result
end
if root.custom_keywords.any?
root.custom_keywords.each do |custom_keyword, callable|
if value.key?(custom_keyword)
[*callable.call(instance, value, instance_location)].each do |custom_keyword_result|
custom_keyword_valid = custom_keyword_result == true
valid &&= custom_keyword_valid
type = custom_keyword_result.is_a?(String) ? custom_keyword_result : custom_keyword
details = { 'keyword' => custom_keyword, 'result' => custom_keyword_result }
nested << result(instance, instance_location, keyword_location, custom_keyword_valid, :type => type, :details => details)
end
end
end
end
result(instance, instance_location, keyword_location, valid, nested)
ensure
context.dynamic_scope.pop
context.adjacent_results = original_adjacent_results
end
end
def resolve_ref(uri)
pointer = ''
if Format.valid_json_pointer?(uri.fragment)
pointer = URI.decode_www_form_component(uri.fragment)
uri.fragment = nil
end
lexical_resources = resources.fetch(:lexical)
schema = lexical_resources[uri]
if !schema && uri.fragment.nil?
empty_fragment_uri = uri.dup
empty_fragment_uri.fragment = ''
schema = lexical_resources[empty_fragment_uri]
end
unless schema
location_independent_identifier = uri.fragment
uri.fragment = nil
remote_schema = JSONSchemer.schema(
ref_resolver.call(uri) || raise(InvalidRefResolution, uri.to_s),
:base_uri => uri,
:meta_schema => meta_schema,
:format => format,
:formats => formats,
:content_encodings => content_encodings,
:content_media_types => content_media_types,
:keywords => custom_keywords,
:before_property_validation => before_property_validation,
:after_property_validation => after_property_validation,
:property_default_resolver => property_default_resolver,
:ref_resolver => ref_resolver,
:regexp_resolver => regexp_resolver
)
remote_uri = remote_schema.base_uri.dup
remote_uri.fragment = location_independent_identifier if location_independent_identifier
schema = remote_schema.resources.fetch(:lexical).fetch(remote_uri)
end
schema = Hana::Pointer.parse(pointer).reduce(schema) do |obj, token|
obj.fetch(token)
rescue IndexError
raise InvalidRefPointer, pointer
end
schema = schema.parsed_schema if schema.is_a?(Keyword)
raise InvalidRefPointer, pointer unless schema.is_a?(Schema)
schema
end
def resolve_regexp(pattern)
regexp_resolver.call(pattern) || raise(InvalidRegexpResolution, pattern)
end
def bundle
return value unless value.is_a?(Hash)
id_keyword = meta_schema.id_keyword
defs_keyword = meta_schema.defs_keyword
compound_document = value.dup
compound_document[id_keyword] = base_uri.to_s
compound_document['$schema'] = meta_schema.base_uri.to_s
embedded_resources = compound_document[defs_keyword] = (compound_document[defs_keyword]&.dup || {})
if compound_document.key?('$ref') && meta_schema.keywords.fetch('$ref').exclusive?
compound_document['allOf'] = (compound_document['allOf']&.dup || [])
compound_document['allOf'] << { '$ref' => compound_document.delete('$ref') }
end
values = [self]
while value = values.shift
case value
when Schema
values << value.parsed
when Keyword
if value.respond_to?(:ref_uri) && value.respond_to?(:ref_schema)
ref_uri = value.ref_uri.dup
ref_uri.fragment = nil
ref_id = ref_uri.to_s
ref_schema = value.ref_schema.root
next if ref_schema == root || embedded_resources.key?(ref_id)
embedded_resource = ref_schema.value.dup
embedded_resource[id_keyword] = ref_id
embedded_resource['$schema'] = ref_schema.meta_schema.base_uri.to_s
embedded_resources[ref_id] = embedded_resource
values << ref_schema
else
values << value.parsed
end
when Hash
values.concat(value.values)
when Array
values.concat(value)
end
end
compound_document
end
def absolute_keyword_location
# using `equal?` because `URI::Generic#==` is slow
@absolute_keyword_location ||= if !parent || (!parent.schema.base_uri.equal?(base_uri) && (base_uri.fragment.nil? || base_uri.fragment.empty?))
absolute_keyword_location_uri = base_uri.dup
absolute_keyword_location_uri.fragment = ''
absolute_keyword_location_uri.to_s
elsif keyword
"#{parent.absolute_keyword_location}/#{fragment_encode(escaped_keyword)}"
else
parent.absolute_keyword_location
end
end
def schema_pointer
@schema_pointer ||= if !parent
''
elsif keyword
"#{parent.schema_pointer}/#{escaped_keyword}"
else
parent.schema_pointer
end
end
def error_key
'^'
end
def fetch(key)
parsed.fetch(key)
end
def fetch_format(format, *args, &block)
if meta_schema == self
formats.fetch(format, *args, &block)
else
formats.fetch(format) { meta_schema.fetch_format(format, *args, &block) }
end
end
def fetch_content_encoding(content_encoding, *args, &block)
if meta_schema == self
content_encodings.fetch(content_encoding, *args, &block)
else
content_encodings.fetch(content_encoding) { meta_schema.fetch_content_encoding(content_encoding, *args, &block) }
end
end
def fetch_content_media_type(content_media_type, *args, &block)
if meta_schema == self
content_media_types.fetch(content_media_type, *args, &block)
else
content_media_types.fetch(content_media_type) { meta_schema.fetch_content_media_type(content_media_type, *args, &block) }
end
end
def id_keyword
@id_keyword ||= (keywords.key?('$id') ? '$id' : 'id')
end
def defs_keyword
@defs_keyword ||= (keywords.key?('$defs') ? '$defs' : 'definitions')
end
def resources
@resources ||= { :lexical => {}, :dynamic => {} }
end
def error(formatted_instance_location:, **options)
if value == false && parent&.respond_to?(:false_schema_error)
parent.false_schema_error(:formatted_instance_location => formatted_instance_location, **options)
else
"value at #{formatted_instance_location} does not match schema"
end
end
def inspect
"#<#{self.class.name} @value=#{@value.inspect} @parent=#{@parent.inspect} @keyword=#{@keyword.inspect}>"
end
private
def parse
@parsed = {}
if value.is_a?(Hash) && value.key?('$schema')
@parsed['$schema'] = SCHEMA_KEYWORD_CLASS.new(value.fetch('$schema'), self, '$schema')
elsif root == self && !meta_schema
SCHEMA_KEYWORD_CLASS.new(DEFAULT_SCHEMA, self, '$schema')
end
if value.is_a?(Hash) && value.key?('$vocabulary')
@parsed['$vocabulary'] = VOCABULARY_KEYWORD_CLASS.new(value.fetch('$vocabulary'), self, '$vocabulary')
elsif vocabulary
VOCABULARY_KEYWORD_CLASS.new(vocabulary, self, '$vocabulary')
end
keywords = meta_schema.keywords
exclusive_ref = value.is_a?(Hash) && value.key?('$ref') && keywords.fetch('$ref').exclusive?
if root == self && (!value.is_a?(Hash) || !value.key?(meta_schema.id_keyword) || exclusive_ref)
ID_KEYWORD_CLASS.new(base_uri, self, meta_schema.id_keyword)
end
if exclusive_ref
@parsed['$ref'] = keywords.fetch('$ref').new(value.fetch('$ref'), self, '$ref')
defs_keyword = meta_schema.defs_keyword
if value.key?(defs_keyword) && keywords.key?(defs_keyword)
@parsed[defs_keyword] = keywords.fetch(defs_keyword).new(value.fetch(defs_keyword), self, defs_keyword)
end
elsif value.is_a?(Hash)
keyword_order = meta_schema.keyword_order
last = keywords.size
value.sort do |(keyword_a, _value_a), (keyword_b, _value_b)|
keyword_order.fetch(keyword_a, last) <=> keyword_order.fetch(keyword_b, last)
end.each do |keyword, value|
@parsed[keyword] ||= keywords.fetch(keyword, UNKNOWN_KEYWORD_CLASS).new(value, self, keyword)
end
end
@parsed
end
def root_keyword_location
@root_keyword_location ||= Location.root
end
def ref_resolver
@ref_resolver ||= @original_ref_resolver == 'net/http' ? CachedResolver.new(&NET_HTTP_REF_RESOLVER) : @original_ref_resolver
end
def regexp_resolver
@regexp_resolver ||= case @original_regexp_resolver
when 'ecma'
CachedResolver.new(&ECMA_REGEXP_RESOLVER)
when 'ruby'
CachedResolver.new(&RUBY_REGEXP_RESOLVER)
else
@original_regexp_resolver
end
end
def resolve_enumerators!(output)
case output
when Hash
output.transform_values! { |value| resolve_enumerators!(value) }
when Enumerator
output.map { |value| resolve_enumerators!(value) }
else
output
end
end
end
end