Class: JSON::Validator

Inherits:
Object
  • Object
show all
Defined in:
lib/json-schema/validator.rb

Constant Summary collapse

ValidationMethods = 
[
  "type",
  "disallow",
  "minimum",
  "maximum",
  "minItems",
  "maxItems",
  "uniqueItems",
  "pattern",
  "minLength",
  "maxLength",
  "divisibleBy",
  "enum",
  "properties",
  "patternProperties",
  "additionalProperties",
  "items",
  "additionalItems",
  "dependencies",
  "extends",
  "$ref"
]
@@schemas = 
{}
@@cache_schemas = 
false
@@default_opts = 
{
  :list => false
}

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema_data, data, opts = {}) ⇒ Validator

Returns a new instance of Validator.



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# File 'lib/json-schema/validator.rb', line 51

def initialize(schema_data, data, opts={})
  @options = @@default_opts.clone.merge(opts)
  @base_schema = initialize_schema(schema_data)
  @data = initialize_data(data)    
  build_schemas(@base_schema)
end

Class Method Details

.add_schema(schema) ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 604

def add_schema(schema)
  @@schemas[schema.uri.to_s] = schema if @@schemas[schema.uri.to_s].nil?
end

.cache_schemas=(val) ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 608

def cache_schemas=(val)
  @@cache_schemas = val == true ? true : false
end

.clear_cache ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 596

def clear_cache
  @@schemas = {} if @@cache_schemas == false
end

.schemas ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 600

def schemas
  @@schemas
end

.validate(schema, data, opts = {}) ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 586

def validate(schema, data,opts={})
  validator = JSON::Validator.new(schema, data, opts)
  validator.validate
end

.validate2(schema, data, opts = {}) ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 591

def validate2(schema, data,opts={})
  validator = JSON::Validator.new(schema, data, opts)
  validator.validate2
end

Instance Method Details

#build_fragment(fragments) ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 492

def build_fragment(fragments)
  "#/#{fragments.join('/')}"
end

#build_schemas(parent_schema) ⇒ Object

Build all schemas with IDs, mapping out the namespace



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# File 'lib/json-schema/validator.rb', line 528

def build_schemas(parent_schema)
  
  # 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
    
  # All properties are schemas
  if parent_schema.schema["properties"]
    parent_schema.schema["properties"].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

#handle_schema(parent_schema, obj) ⇒ Object

Either load a reference schema or create a new schema



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# File 'lib/json-schema/validator.rb', line 571

def handle_schema(parent_schema, obj)
  if obj['$ref']
     load_ref_schema(parent_schema, obj['$ref'])
   else
     schema_uri = parent_schema.uri.clone
     schema = JSON::Schema.new(obj,schema_uri)
     if obj['id']
       Validator.add_schema(schema)
     end
     build_schemas(schema)
   end
end

#load_ref_schema(parent_schema, ref) ⇒ Object 



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# File 'lib/json-schema/validator.rb', line 497

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]
    if path[0,1] == '/'
      uri.path = Pathname.new(path).cleanpath
    else
      uri.path = (Pathname.new(parent_schema.uri.path).parent + path).cleanpath
    end
    uri.fragment = nil
  end
  
  if Validator.schemas[uri.to_s].nil?
    begin
      schema = JSON::Schema.new(JSON.parse(open(uri.to_s).read), uri)
      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
      # 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

#validate ⇒ Object

Run a simple true/false validation of data against a schema



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# File 'lib/json-schema/validator.rb', line 60

def validate()
  begin
    validate_schema(@base_schema, @data, [])
    Validator.clear_cache
    return true
  rescue ValidationError
    Validator.clear_cache
    return false
  end
end

#validate2 ⇒ Object

Validate data against a schema, returning nil if the data is valid. If the data is invalid, a ValidationError will be raised with links to the specific location that the first error occurred during validation



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# File 'lib/json-schema/validator.rb', line 75

def validate2()
  begin
    validate_schema(@base_schema, @data, [])
    Validator.clear_cache
  rescue ValidationError
    Validator.clear_cache
    raise $!
  end
  nil
end

#validate_additionalItems(current_schema, data, fragments) ⇒ Object

Validate items in an array that are not part of the schema at least match a set of rules



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# File 'lib/json-schema/validator.rb', line 396

def validate_additionalItems(current_schema, data, fragments)
  if data.is_a?(Array) && current_schema.schema['items'].is_a?(Array)
    if current_schema.schema['additionalItems'] == false && current_schema.schema['items'].length != data.length
      message = "The property '#{build_fragment(fragments)}' contains additional array elements outside of the schema when none are allowed"
      raise ValidationError.new(message, fragments, current_schema)
    elsif current_schema.schema['additionalItems'].is_a?(Hash)
      schema = JSON::Schema.new(current_schema.schema['additionalItems'],current_schema.uri)
      data.each_with_index do |item,i|
        if i >= current_schema.schema['items'].length
          fragments << i.to_s
          validate_schema(schema, item, fragments)
          fragments.pop
        end
      end
    end
  end
end

#validate_additionalProperties(current_schema, data, fragments) ⇒ Object

Validate properties of an object that are not defined in the schema at least validate against a set of rules



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# File 'lib/json-schema/validator.rb', line 338

def validate_additionalProperties(current_schema, data, fragments)
  if data.is_a?(Hash)
    extra_properties = data.keys
    
    if current_schema.schema['properties']
      extra_properties = extra_properties - current_schema.schema['properties'].keys
    end
    
    if current_schema.schema['patternProperties']
      current_schema.schema['patternProperties'].each_key do |key|
        r = Regexp.new(key)
        extras_clone = extra_properties.clone
        extras_clone.each do |prop|
          if r.match(prop)
            extra_properties = extra_properties - [prop]
          end
        end
      end
    end
    
    if current_schema.schema['additionalProperties'] == false && !extra_properties.empty?
      message = "The property '#{build_fragment(fragments)}' contains additional properties outside of the schema when none are allowed"
      raise ValidationError.new(message, fragments, current_schema)
    elsif current_schema.schema['additionalProperties'].is_a?(Hash)
      extra_properties.each do |key|
        schema = JSON::Schema.new(current_schema.schema['additionalProperties'],current_schema.uri)
        fragments << key
        validate_schema(schema, data[key], fragments)
        fragments.pop
      end
    end
  end
end

#validate_dependencies(current_schema, data, fragments) ⇒ Object

Validate the dependencies of a property



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# File 'lib/json-schema/validator.rb', line 416

def validate_dependencies(current_schema, data, fragments)
  if data.is_a?(Hash)
    current_schema.schema['dependencies'].each do |property,dependency_value|
      if data.has_key?(property)
        if dependency_value.is_a?(String) && !data.has_key?(dependency_value)
          message = "The property '#{build_fragment(fragments)}' has a property '#{property}' that depends on a missing property '#{dependency_value}'"
          raise ValidationError.new(message, fragments, current_schema)
        elsif dependency_value.is_a?(Array)
          dependency_value.each do |value|
            if !data.has_key?(value)
              message = "The property '#{build_fragment(fragments)}' has a property '#{property}' that depends on a missing property '#{value}'"
              raise ValidationError.new(message, fragments, current_schema)
            end
          end
        else
          schema = JSON::Schema.new(dependency_value,current_schema.uri)
          validate_schema(schema, data, fragments)
        end
      end
    end
  end
end

#validate_disallow(current_schema, data, fragments) ⇒ Object

Validate the disallowed types



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# File 'lib/json-schema/validator.rb', line 169

def validate_disallow(current_schema, data, fragments)
  validate_type(current_schema, data, fragments, true)
end

#validate_divisibleBy(current_schema, data, fragments) ⇒ Object

Validate a numeric is divisible by another numeric



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# File 'lib/json-schema/validator.rb', line 264

def validate_divisibleBy(current_schema, data, fragments)
  if data.is_a?(Numeric)
    if current_schema.schema['divisibleBy'] == 0 || 
       current_schema.schema['divisibleBy'] == 0.0 ||
       (BigDecimal.new(data.to_s) % BigDecimal.new(current_schema.schema['divisibleBy'].to_s)).to_f != 0
       message = "The property '#{build_fragment(fragments)}' was not divisible by #{current_schema.schema['divisibleBy']}"
       raise ValidationError.new(message, fragments, current_schema)
    end
  end
end

#validate_enum(current_schema, data, fragments) ⇒ Object

Validate an item matches at least one of an array of values



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# File 'lib/json-schema/validator.rb', line 277

def validate_enum(current_schema, data, fragments)
  if !current_schema.schema['enum'].include?(data)
    message = "The property '#{build_fragment(fragments)}' did not match one of the following values:"
    current_schema.schema['enum'].each {|val|
      if val.is_a?(NilClass)
        message += " null,"
      elsif val.is_a?(Array)
        message += " (array),"
      elsif val.is_a?(Hash)
        message += " (object),"
      else
        message += " #{val.to_s},"
      end
    }
    message.chop!
    raise ValidationError.new(message, fragments, current_schema)
  end
end

#validate_extends(current_schema, data, fragments) ⇒ Object

Validate extensions of other schemas



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# File 'lib/json-schema/validator.rb', line 441

def validate_extends(current_schema, data, fragments)
  schemas = current_schema.schema['extends']
  schemas = [schemas] if !schemas.is_a?(Array)
  schemas.each do |s|
    schema = JSON::Schema.new(s,current_schema.uri)
    validate_schema(schema, data, fragments)
  end
end

#validate_items(current_schema, data, fragments) ⇒ Object

Validate items in an array match a schema or a set of schemas



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# File 'lib/json-schema/validator.rb', line 374

def validate_items(current_schema, data, fragments)
  if data.is_a?(Array)
     if current_schema.schema['items'].is_a?(Hash)
       data.each_with_index do |item,i|
         schema = JSON::Schema.new(current_schema.schema['items'],current_schema.uri)
         fragments << i.to_s
         validate_schema(schema,item,fragments)
         fragments.pop
       end
     elsif current_schema.schema['items'].is_a?(Array)
       current_schema.schema['items'].each_with_index do |item_schema,i|
         schema = JSON::Schema.new(item_schema,current_schema.uri)
         fragments << i.to_s
         validate_schema(schema,data[i],fragments)
         fragments.pop
       end
     end
  end
end

#validate_maximum(current_schema, data, fragments) ⇒ Object

Validate the maximum value of a number



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# File 'lib/json-schema/validator.rb', line 187

def validate_maximum(current_schema, data, fragments)
  if data.is_a?(Numeric)
    if (current_schema.schema['exclusiveMaximum'] ? data >= current_schema.schema['maximum'] : data > current_schema.schema['maximum'])
      message = "The property '#{build_fragment(fragments)}' did not have a maximum value of #{current_schema.schema['maximum']}, "
      message += current_schema.schema['exclusiveMaximum'] ? 'exclusively' : 'inclusively'
      raise ValidationError.new(message, fragments, current_schema)
    end
  end
end

#validate_maxItems(current_schema, data, fragments) ⇒ Object

Validate the maximum number of items in an array



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# File 'lib/json-schema/validator.rb', line 208

def validate_maxItems(current_schema, data, fragments)
  if data.is_a?(Array) && (data.nitems > current_schema.schema['maxItems'])
    message = "The property '#{build_fragment(fragments)}' did not contain a minimum number of items #{current_schema.schema['minItems']}"
    raise ValidationError.new(message, fragments, current_schema)
  end
end

#validate_maxLength(current_schema, data, fragments) ⇒ Object

Validate a string is at maximum of a certain length



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# File 'lib/json-schema/validator.rb', line 253

def validate_maxLength(current_schema, data, fragments)
  if data.is_a?(String)
    if data.length > current_schema.schema['maxLength']
      message = "The property '#{build_fragment(fragments)}' was not of a maximum string length of #{current_schema.schema['maxLength']}"
      raise ValidationError.new(message, fragments, current_schema)
    end
  end
end

#validate_minimum(current_schema, data, fragments) ⇒ Object

Validate the minimum value of a number



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# File 'lib/json-schema/validator.rb', line 175

def validate_minimum(current_schema, data, fragments)
  if data.is_a?(Numeric)
    if (current_schema.schema['exclusiveMinimum'] ? data <= current_schema.schema['minimum'] : data < current_schema.schema['minimum'])
      message = "The property '#{build_fragment(fragments)}' did not have a minimum value of #{current_schema.schema['minimum']}, "
      message += current_schema.schema['exclusiveMinimum'] ? 'exclusively' : 'inclusively'
      raise ValidationError.new(message, fragments, current_schema)
    end
  end
end

#validate_minItems(current_schema, data, fragments) ⇒ Object

Validate the minimum number of items in an array



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# File 'lib/json-schema/validator.rb', line 199

def validate_minItems(current_schema, data, fragments)
  if data.is_a?(Array) && (data.nitems < current_schema.schema['minItems'])
    message = "The property '#{build_fragment(fragments)}' did not contain a minimum number of items #{current_schema.schema['minItems']}"
    raise ValidationError.new(message, fragments, current_schema)
  end
end

#validate_minLength(current_schema, data, fragments) ⇒ Object

Validate a string is at least of a certain length



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# File 'lib/json-schema/validator.rb', line 242

def validate_minLength(current_schema, data, fragments)
  if data.is_a?(String)
    if data.length < current_schema.schema['minLength']
      message = "The property '#{build_fragment(fragments)}' was not of a minimum string length of #{current_schema.schema['minLength']}"
      raise ValidationError.new(message, fragments, current_schema)
    end
  end
end

#validate_pattern(current_schema, data, fragments) ⇒ Object

Validate a string matches a regex pattern



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# File 'lib/json-schema/validator.rb', line 230

def validate_pattern(current_schema, data, fragments)
  if data.is_a?(String)
    r = Regexp.new(current_schema.schema['pattern'])
    if (r.match(data)).nil?
      message = "The property '#{build_fragment(fragments)}' did not match the regex '#{current_schema.schema['pattern']}'"
      raise ValidationError.new(message, fragments, current_schema)
    end
  end
end

#validate_patternProperties(current_schema, data, fragments) ⇒ Object

Validate properties of an object against a schema when the property name matches a specific regex



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# File 'lib/json-schema/validator.rb', line 318

def validate_patternProperties(current_schema, data, fragments)
  if data.is_a?(Hash)
    current_schema.schema['patternProperties'].each do |property,property_schema|
      r = Regexp.new(property)
      
      # Check each key in the data hash to see if it matches the regex
      data.each do |key,value|
        if r.match(key)
          schema = JSON::Schema.new(property_schema,current_schema.uri)
          fragments << key
          validate_schema(schema, data[key], fragments)
          fragments.pop
        end
      end
    end
  end
end

#validate_properties(current_schema, data, fragments) ⇒ Object

Validate a set of properties of an object



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# File 'lib/json-schema/validator.rb', line 298

def validate_properties(current_schema, data, fragments)
  if data.is_a?(Hash)
    current_schema.schema['properties'].each do |property,property_schema|
      if (property_schema['required'] && !data.has_key?(property))
        message = "The property '#{build_fragment(fragments)}' did not contain a required property of '#{property}'"
        raise ValidationError.new(message, fragments, current_schema)
      end
      
      if data.has_key?(property)
        schema = JSON::Schema.new(property_schema,current_schema.uri)
        fragments << property
        validate_schema(schema, data[property], fragments)
        fragments.pop
      end
    end
  end
end

#validate_ref(current_schema, data, fragments) ⇒ Object

Validate schema references



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# File 'lib/json-schema/validator.rb', line 452

def validate_ref(current_schema, data, fragments)
  temp_uri = URI.parse(current_schema.schema['$ref'])
  if temp_uri.relative?
    temp_uri = current_schema.uri.clone
    # Check for absolute path
    path = current_schema.schema['$ref'].split("#")[0]
    if path[0,1] == "/"
      temp_uri.path = Pathname.new(path).cleanpath
    else
      temp_uri.path = (Pathname.new(current_schema.uri.path).parent + path).cleanpath
    end
    temp_uri.fragment = current_schema.schema['$ref'].split("#")[1]
  end
  temp_uri.fragment = "" if temp_uri.fragment.nil?
  
  # Grab the parent schema from the schema list
  schema_key = temp_uri.to_s.split("#")[0]
  ref_schema = Validator.schemas[schema_key]
  
  if ref_schema
    # Perform fragment resolution to retrieve the appropriate level for the schema
    target_schema = ref_schema.schema
    fragments = temp_uri.fragment.split("/")
    fragments.each do |fragment|
      if fragment && fragment != ''
        if target_schema.is_a?(Array)
          target_schema = target_schema[fragment.to_i]
        else
          target_schema = target_schema[fragment]
        end
      end
    end
    
    # We have the schema finally, build it and validate!
    schema = JSON::Schema.new(target_schema,temp_uri)
    validate_schema(schema, data, fragments)
  end
end

#validate_schema(current_schema, data, fragments) ⇒ Object

Validate the current schema



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# File 'lib/json-schema/validator.rb', line 88

def validate_schema(current_schema, data, fragments)
      
  ValidationMethods.each do |method|
    if !current_schema.schema[method].nil?
      self.send(("validate_" + method.sub('$','')).to_sym, current_schema, data, fragments)
    end
  end
  
  data
end

#validate_type(current_schema, data, fragments, disallow = false) ⇒ Object

Validate the type



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# File 'lib/json-schema/validator.rb', line 101

def validate_type(current_schema, data, fragments, disallow=false)
  union = true
  
  if disallow
    types = current_schema.schema['disallow']
  else
    types = current_schema.schema['type']
  end
  
  if !types.is_a?(Array)
    types = [types]
    union = false
  end
  valid = false
  
  types.each do |type|
    if type.is_a?(String)
      case type
      when "string"
        valid = data.is_a?(String)
      when "number"
        valid = data.is_a?(Numeric)
      when "integer"
        valid = data.is_a?(Integer)
      when "boolean"
        valid = (data.is_a?(TrueClass) || data.is_a?(FalseClass))
      when "object"
        valid = data.is_a?(Hash)
      when "array"
        valid = data.is_a?(Array)
      when "null"
        valid = data.is_a?(NilClass)
      when "any"
        valid = true
      else
        valid = true
      end
    elsif type.is_a?(Hash) && union
      # Validate as a schema
      schema = JSON::Schema.new(type,current_schema.uri)
      begin
        validate_schema(schema,data,fragments)
        valid = true
      rescue ValidationError
        # We don't care that these schemas don't validate - we only care that one validated
      end
    end

    break if valid
  end
  
  if (disallow)
    if valid
      message = "The property '#{build_fragment(fragments)}' matched one or more of the following types:"
      types.each {|type| message += type.is_a?(String) ? " #{type}," : " (schema)," }
      message.chop!
      raise ValidationError.new(message, fragments, current_schema)
    end
  elsif !valid
    message = "The property '#{build_fragment(fragments)}' did not match one or more of the following types:"
    types.each {|type| message += type.is_a?(String) ? " #{type}," : " (schema)," }
    message.chop!
    raise ValidationError.new(message, fragments, current_schema)
  end
end

#validate_uniqueItems(current_schema, data, fragments) ⇒ Object

Validate the uniqueness of elements in an array



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# File 'lib/json-schema/validator.rb', line 217

def validate_uniqueItems(current_schema, data, fragments)
  if data.is_a?(Array)
    d = data.clone
    dupes = d.uniq!
    if dupes
      message = "The property '#{build_fragment(fragments)}' contained duplicated array values"
      raise ValidationError.new(message, fragments, current_schema)
    end
  end
end