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validator.rb
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validator.rb
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require 'uri'
require 'open-uri'
require 'pathname'
require 'bigdecimal'
require 'digest/sha1'
require 'date'
require 'thread'
module JSON
class Schema
class ValidationError < StandardError
attr_accessor :fragments, :schema, :failed_attribute, :sub_errors
def initialize(message, fragments, failed_attribute, schema)
@fragments = fragments.clone
@schema = schema
@sub_errors = []
@failed_attribute = failed_attribute
message = "#{message} in schema #{schema.uri}"
super(message)
end
def to_string
if @sub_errors.empty?
message
else
full_message = message + "\n The schema specific errors were:\n"
@sub_errors.each{|e| full_message = full_message + " - " + e.to_string + "\n"}
full_message
end
end
def to_hash
base = {:schema => @schema.uri, :fragment => ::JSON::Schema::Attribute.build_fragment(fragments), :message => message, :failed_attribute => @failed_attribute.to_s.split(":").last.split("Attribute").first}
if !@sub_errors.empty?
base[:errors] = @sub_errors.map{|e| e.to_hash}
end
base
end
end
class SchemaError < StandardError
end
class JsonParseError < StandardError
end
class Attribute
def self.validate(current_schema, data, fragments, processor, validator, options = {})
end
def self.build_fragment(fragments)
"#/#{fragments.join('/')}"
end
def self.validation_error(processor, message, fragments, current_schema, failed_attribute, record_errors)
error = ValidationError.new(message, fragments, failed_attribute, current_schema)
if record_errors
processor.validation_error(error)
else
raise error
end
end
def self.validation_errors(validator)
validator.validation_errors
end
end
class Validator
attr_accessor :attributes, :uri
def initialize()
@attributes = {}
@uri = nil
end
def extend_schema_definition(schema_uri)
u = URI.parse(schema_uri)
validator = JSON::Validator.validators["#{u.scheme}://#{u.host}#{u.path}"]
if validator.nil?
raise SchemaError.new("Schema not found: #{u.scheme}://#{u.host}#{u.path}")
end
@attributes.merge!(validator.attributes)
end
def to_s
"#{@uri.scheme}://#{uri.host}#{uri.path}"
end
def validate(current_schema, data, fragments, processor, options = {})
current_schema.schema.each do |attr_name,attribute|
if @attributes.has_key?(attr_name.to_s)
@attributes[attr_name.to_s].validate(current_schema, data, fragments, processor, self, options)
end
end
data
end
end
end
class Validator
@@schemas = {}
@@cache_schemas = false
@@default_opts = {
:list => false,
:version => nil,
:validate_schema => false,
:record_errors => false,
:errors_as_objects => false,
:insert_defaults => false
}
@@validators = {}
@@default_validator = nil
@@available_json_backends = []
@@json_backend = nil
@@serializer = nil
@@mutex = Mutex.new
def self.version_string_for(version)
# I'm not a fan of this, but it's quick and dirty to get it working for now
return "draft-04" unless version
case version.to_s
when "draft4", "http://json-schema.org/draft-04/schema#"
"draft-04"
when "draft3", "http://json-schema.org/draft-03/schema#"
"draft-03"
when "draft2"
"draft-02"
when "draft1"
"draft-01"
else
raise JSON::Schema::SchemaError.new("The requested JSON schema version is not supported")
end
end
def self.metaschema_for(version_string)
File.join(Pathname.new(File.dirname(__FILE__)).parent.parent, "resources", "#{version_string}.json").to_s
end
def initialize(schema_data, data, opts={})
@options = @@default_opts.clone.merge(opts)
@errors = []
# I'm not a fan of this, but it's quick and dirty to get it working for now
version_string = "draft-04"
if @options[:version]
version_string = @options[:version] = self.class.version_string_for(@options[:version])
u = URI.parse("http://json-schema.org/#{@options[:version]}/schema#")
validator = JSON::Validator.validators["#{u.scheme}://#{u.host}#{u.path}"]
@options[:version] = validator
end
@validation_options = @options[:record_errors] ? {:record_errors => true} : {}
@validation_options[:insert_defaults] = true if @options[:insert_defaults]
@@mutex.synchronize { @base_schema = initialize_schema(schema_data) }
@data = initialize_data(data)
@@mutex.synchronize { build_schemas(@base_schema) }
# validate the schema, if requested
if @options[:validate_schema]
begin
if @base_schema.schema["$schema"]
version_string = @options[:version] = self.class.version_string_for(@base_schema.schema["$schema"])
end
meta_validator = JSON::Validator.new(self.class.metaschema_for(version_string), @base_schema.schema)
meta_validator.validate
rescue JSON::Schema::ValidationError, JSON::Schema::SchemaError
raise $!
end
end
# If the :fragment option is set, try and validate against the fragment
if opts[:fragment]
@base_schema = schema_from_fragment(@base_schema, opts[:fragment])
end
end
def schema_from_fragment(base_schema, fragment)
fragments = fragment.split("/")
# ensure the first element was a hash, per the fragment spec
if fragments.shift != "#"
raise JSON::Schema::SchemaError.new("Invalid fragment syntax in :fragment option")
end
fragments.each do |f|
if base_schema.is_a?(Hash)
if !base_schema.has_key?(f)
raise JSON::Schema::SchemaError.new("Invalid fragment resolution for :fragment option")
end
base_schema = base_schema[f]
elsif base_schema.is_a?(Array)
if base_schema[f.to_i].nil?
raise JSON::Schema::SchemaError.new("Invalid fragment resolution for :fragment option")
end
base_schema = base_schema[f.to_i]
else
raise JSON::Schema::SchemaError.new("Invalid schema encountered when resolving :fragment option")
end
end
base_schema
end
# Run a simple true/false validation of data against a schema
def validate()
begin
@base_schema.validate(@data,[],self,@validation_options)
Validator.clear_cache
if @options[:errors_as_objects]
return @errors.map{|e| e.to_hash}
else
return @errors.map{|e| e.to_string}
end
rescue JSON::Schema::ValidationError
Validator.clear_cache
raise $!
end
end
def load_ref_schema(parent_schema,ref)
uri = URI.parse(ref)
if uri.relative?
uri = parent_schema.uri.clone
# Check for absolute path
path = ref.split("#")[0]
# This is a self reference and thus the schema does not need to be re-loaded
if path.nil? || path == ''
return
end
if path && path[0,1] == '/'
uri.path = Pathname.new(path).cleanpath.to_s
else
uri = parent_schema.uri.merge(path)
end
uri.fragment = ''
end
if Validator.schemas[uri.to_s].nil?
begin
schema = JSON::Schema.new(JSON::Validator.parse(open(uri.to_s).read), uri, @options[:version])
Validator.add_schema(schema)
build_schemas(schema)
rescue JSON::ParserError
# Don't rescue this error, we want JSON formatting issues to bubble up
raise $!
rescue Exception
# Failures will occur when this URI cannot be referenced yet. Don't worry about it,
# the proper error will fall out if the ref isn't ever defined
end
end
end
# Build all schemas with IDs, mapping out the namespace
def build_schemas(parent_schema)
# Build ref schemas if they exist
if parent_schema.schema["$ref"]
load_ref_schema(parent_schema, parent_schema.schema["$ref"])
end
if parent_schema.schema["extends"]
if parent_schema.schema["extends"].is_a?(String)
load_ref_schema(parent_schema, parent_schema.schema["extends"])
elsif parent_schema.schema["extends"].is_a?(Array)
parent_schema.schema["extends"].each do |type|
handle_schema(parent_schema, type)
end
end
end
# handle validations that always contain schemas
["allOf", "anyOf", "oneOf", "not"].each do |key|
if parent_schema.schema.has_key?(key)
validations = parent_schema.schema[key]
validations = [validations] unless validations.is_a?(Array)
validations.each {|v| handle_schema(parent_schema, v) }
end
end
# Check for schemas in union types
["type", "disallow"].each do |key|
if parent_schema.schema[key] && parent_schema.schema[key].is_a?(Array)
parent_schema.schema[key].each_with_index do |type,i|
if type.is_a?(Hash)
handle_schema(parent_schema, type)
end
end
end
end
# "definitions" are schemas in V4
if parent_schema.schema["definitions"]
parent_schema.schema["definitions"].each do |k,v|
handle_schema(parent_schema, v)
end
end
# All properties are schemas
if parent_schema.schema["properties"]
parent_schema.schema["properties"].each do |k,v|
handle_schema(parent_schema, v)
end
end
if parent_schema.schema["patternProperties"]
parent_schema.schema["patternProperties"].each do |k,v|
handle_schema(parent_schema, v)
end
end
# Items are always schemas
if parent_schema.schema["items"]
items = parent_schema.schema["items"].clone
single = false
if !items.is_a?(Array)
items = [items]
single = true
end
items.each_with_index do |item,i|
handle_schema(parent_schema, item)
end
end
# Each of these might be schemas
["additionalProperties", "additionalItems", "dependencies", "extends"].each do |key|
if parent_schema.schema[key].is_a?(Hash)
handle_schema(parent_schema, parent_schema.schema[key])
end
end
end
# Either load a reference schema or create a new schema
def handle_schema(parent_schema, obj)
if obj.is_a?(Hash)
schema_uri = parent_schema.uri.clone
schema = JSON::Schema.new(obj,schema_uri,parent_schema.validator)
if obj['id']
Validator.add_schema(schema)
end
build_schemas(schema)
end
end
def validation_error(error)
@errors.push(error)
end
def validation_errors
@errors
end
class << self
def validate(schema, data,opts={})
begin
validator = JSON::Validator.new(schema, data, opts)
validator.validate
return true
rescue JSON::Schema::ValidationError, JSON::Schema::SchemaError
return false
end
end
def validate_json(schema, data, opts={})
validate(schema, data, opts.merge(:json => true))
end
def validate_uri(schema, data, opts={})
validate(schema, data, opts.merge(:uri => true))
end
def validate!(schema, data,opts={})
validator = JSON::Validator.new(schema, data, opts)
validator.validate
return true
end
alias_method 'validate2', 'validate!'
def validate_json!(schema, data, opts={})
validate!(schema, data, opts.merge(:json => true))
end
def validate_uri!(schema, data, opts={})
validate!(schema, data, opts.merge(:uri => true))
end
def fully_validate(schema, data, opts={})
opts[:record_errors] = true
validator = JSON::Validator.new(schema, data, opts)
validator.validate
end
def fully_validate_schema(schema, opts={})
data = schema
schema = metaschema_for(version_string_for(opts[:version]))
fully_validate(schema, data, opts)
end
def fully_validate_json(schema, data, opts={})
fully_validate(schema, data, opts.merge(:json => true))
end
def fully_validate_uri(schema, data, opts={})
fully_validate(schema, data, opts.merge(:uri => true))
end
def clear_cache
@@schemas = {} if @@cache_schemas == false
end
def schemas
@@schemas
end
def add_schema(schema)
@@schemas[schema.uri.to_s] = schema if @@schemas[schema.uri.to_s].nil?
end
def cache_schemas=(val)
@@cache_schemas = val == true ? true : false
end
def validators
@@validators
end
def default_validator
@@default_validator
end
def register_validator(v)
@@validators[v.to_s] = v
end
def register_default_validator(v)
@@default_validator = v
end
def json_backend
if defined?(MultiJson)
MultiJson.respond_to?(:adapter) ? MultiJson.adapter : MultiJson.engine
else
@@json_backend
end
end
def json_backend=(backend)
if defined?(MultiJson)
backend = backend == 'json' ? 'json_gem' : backend
MultiJson.respond_to?(:use) ? MultiJson.use(backend) : MultiJson.engine = backend
else
backend = backend.to_s
if @@available_json_backends.include?(backend)
@@json_backend = backend
else
raise JSON::Schema::JsonParseError.new("The JSON backend '#{backend}' could not be found.")
end
end
end
def parse(s)
if defined?(MultiJson)
MultiJson.respond_to?(:adapter) ? MultiJson.load(s) : MultiJson.decode(s)
else
case @@json_backend.to_s
when 'json'
JSON.parse(s)
when 'yajl'
json = StringIO.new(s)
parser = Yajl::Parser.new
parser.parse(json)
else
raise JSON::Schema::JsonParseError.new("No supported JSON parsers found. The following parsers are suported:\n * yajl-ruby\n * json")
end
end
end
if !defined?(MultiJson)
if begin
Gem::Specification::find_by_name('json')
rescue Gem::LoadError
false
rescue
Gem.available?('json')
end
require 'json'
@@available_json_backends << 'json'
@@json_backend = 'json'
end
# Try force-loading json for rubies > 1.9.2
begin
require 'json'
@@available_json_backends << 'json'
@@json_backend = 'json'
rescue LoadError
end
if begin
Gem::Specification::find_by_name('yajl-ruby')
rescue Gem::LoadError
false
rescue
Gem.available?('yajl-ruby')
end
require 'yajl'
@@available_json_backends << 'yajl'
@@json_backend = 'yajl'
end
if @@json_backend == 'yajl'
@@serializer = lambda{|o| Yajl::Encoder.encode(o) }
else
@@serializer = lambda{|o| Marshal.dump(o) }
end
end
end
private
if begin
Gem::Specification::find_by_name('uuidtools')
rescue Gem::LoadError
false
rescue
Gem.available?('uuidtools')
end
require 'uuidtools'
@@fake_uri_generator = lambda{|s| UUIDTools::UUID.sha1_create(UUIDTools::UUID_URL_NAMESPACE, s).to_s }
else
require 'uri/uuid'
@@fake_uri_generator = lambda{|s| JSON::Util::UUID.create_v5(s,JSON::Util::UUID::Nil).to_s }
end
def serialize schema
if defined?(MultiJson)
MultiJson.respond_to?(:dump) ? MultiJson.dump(schema) : MultiJson.encode(schema)
else
@@serializer.call(schema)
end
end
def fake_uri schema
@@fake_uri_generator.call(schema)
end
def initialize_schema(schema)
if schema.is_a?(String)
begin
# Build a fake URI for this
schema_uri = URI.parse(fake_uri(schema))
schema = JSON::Validator.parse(schema)
if @options[:list]
new_schema = {"type" => "array", "items" => schema}
if !schema["$schema"].nil?
new_schema["$schema"] = schema["$schema"]
end
schema = new_schema
end
schema = JSON::Schema.new(schema,schema_uri,@options[:version])
Validator.add_schema(schema)
rescue
# Build a uri for it
schema_uri = URI.parse(schema)
if schema_uri.relative?
# Check for absolute path
if schema[0,1] == '/'
schema_uri = URI.parse("file://#{schema}")
else
schema_uri = URI.parse("file://#{Dir.pwd}/#{schema}")
end
end
if Validator.schemas[schema_uri.to_s].nil?
schema = JSON::Validator.parse(open(schema_uri.to_s).read)
if @options[:list]
new_schema = {"type" => "array", "items" => schema}
if !schema["$schema"].nil?
new_schema["$schema"] = schema["$schema"]
end
schema = new_schema
end
schema = JSON::Schema.new(schema,schema_uri,@options[:version])
Validator.add_schema(schema)
else
schema = Validator.schemas[schema_uri.to_s]
end
end
elsif schema.is_a?(Hash)
if @options[:list]
new_schema = {"type" => "array", "items" => schema}
if !schema["$schema"].nil?
new_schema["$schema"] = schema["$schema"]
end
schema = new_schema
end
schema_uri = URI.parse(fake_uri(serialize(schema)))
schema = JSON::Schema.new(schema,schema_uri,@options[:version])
Validator.add_schema(schema)
else
raise "Invalid schema - must be either a string or a hash"
end
schema
end
def initialize_data(data)
if @options[:json]
data = JSON::Validator.parse(data)
elsif @options[:uri]
json_uri = URI.parse(data)
if json_uri.relative?
if data[0,1] == '/'
json_uri = URI.parse("file://#{data}")
else
json_uri = URI.parse("file://#{Dir.pwd}/#{data}")
end
end
data = JSON::Validator.parse(open(json_uri.to_s).read)
elsif data.is_a?(String)
begin
data = JSON::Validator.parse(data)
rescue
begin
json_uri = URI.parse(data)
if json_uri.relative?
if data[0,1] == '/'
json_uri = URI.parse("file://#{data}")
else
json_uri = URI.parse("file://#{Dir.pwd}/#{data}")
end
end
data = JSON::Validator.parse(open(json_uri.to_s).read)
rescue
# Silently discard the error - the data will not change
end
end
end
JSON::Schema.add_indifferent_access(data)
data
end
end
end