class GraphQL::StaticValidation::LiteralValidator

Test whether `ast_value` is a valid input for `type`

Public Class Methods

new(context:) click to toggle source
# File lib/graphql/static_validation/literal_validator.rb, line 5
def initialize(context))
  @context = context
  @warden = context.warden
end

Public Instance Methods

validate(ast_value, type) click to toggle source
# File lib/graphql/static_validation/literal_validator.rb, line 10
def validate(ast_value, type)
  if ast_value.is_a?(GraphQL::Language::Nodes::NullValue)
    !type.kind.non_null?
  elsif type.kind.non_null?
    (!ast_value.nil?) && validate(ast_value, type.of_type)
  elsif type.kind.list?
    item_type = type.of_type
    ensure_array(ast_value).all? { |val| validate(val, item_type) }
  elsif ast_value.is_a?(GraphQL::Language::Nodes::VariableIdentifier)
    true
  elsif type.kind.scalar? && constant_scalar?(ast_value)
    type.valid_input?(ast_value, @context)
  elsif type.kind.enum? && ast_value.is_a?(GraphQL::Language::Nodes::Enum)
    type.valid_input?(ast_value.name, @context)
  elsif type.kind.input_object? && ast_value.is_a?(GraphQL::Language::Nodes::InputObject)
    required_input_fields_are_present(type, ast_value) &&
      present_input_field_values_are_valid(type, ast_value)
  else
    false
  end
end

Private Instance Methods

constant_scalar?(ast_value) click to toggle source

The GraphQL grammar supports variables embedded within scalars but graphql.js doesn't support it so we won't either for simplicity

# File lib/graphql/static_validation/literal_validator.rb, line 36
def constant_scalar?(ast_value)
  if ast_value.is_a?(GraphQL::Language::Nodes::VariableIdentifier)
    false
  elsif ast_value.is_a?(Array)
    ast_value.all? { |element| constant_scalar?(element) }
  elsif ast_value.is_a?(GraphQL::Language::Nodes::InputObject)
    ast_value.arguments.all? { |arg| constant_scalar?(arg.value) }
  else
    true
  end
end
ensure_array(value) click to toggle source
# File lib/graphql/static_validation/literal_validator.rb, line 65
def ensure_array(value)
  value.is_a?(Array) ? value : [value]
end
present_input_field_values_are_valid(type, ast_node) click to toggle source
# File lib/graphql/static_validation/literal_validator.rb, line 57
def present_input_field_values_are_valid(type, ast_node)
  field_map = @warden.arguments(type).reduce({}) { |m, f| m[f.name] = f; m}
  ast_node.arguments.all? do |value|
    field = field_map[value.name]
    field && validate(value.value, field.type)
  end
end
required_input_fields_are_present(type, ast_node) click to toggle source
# File lib/graphql/static_validation/literal_validator.rb, line 48
def required_input_fields_are_present(type, ast_node)
  required_field_names = @warden.arguments(type)
    .select { |f| f.type.kind.non_null? }
    .map(&:name)
  present_field_names = ast_node.arguments.map(&:name)
  missing_required_field_names = required_field_names - present_field_names
  missing_required_field_names.none?
end