Class: GraphQL::Schema::Warden Private

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/schema/warden.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Restrict access to a GraphQL::Schema with a user-defined filter.

When validating and executing a query, all access to schema members should go through a warden. If you access the schema directly, you may show a client something that it shouldn’t be allowed to see.

Examples:

Hidding private fields

private_members = -> (member, ctx) { member.metadata[:private] }
result = Schema.execute(query_string, except: private_members)

Custom filter implementation

# It must respond to `#call(member)`.
class MissingRequiredFlags
  def initialize(user)
    @user = user
  end

  # Return `false` if any required flags are missing
  def call(member, ctx)
    member.metadata[:required_flags].any? do |flag|
      !@user.has_flag?(flag)
    end
  end
end

# Then, use the custom filter in query:
missing_required_flags = MissingRequiredFlags.new(current_user)

# This query can only access members which match the user's flags
result = Schema.execute(query_string, except: missing_required_flags)

Direct Known Subclasses

Query::NullContext::NullWarden

Defined Under Namespace

Classes: PassThruWarden

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(filter, context:, schema:) ⇒ Warden

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Warden.

Parameters:



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# File 'lib/graphql/schema/warden.rb', line 87

def initialize(filter, context:, schema:)
  @schema = schema.interpreter? ? schema : schema.graphql_definition
  # Cache these to avoid repeated hits to the inheritance chain when one isn't present
  @query = @schema.query
  @mutation = @schema.mutation
  @subscription = @schema.subscription
  @context = context
  @visibility_cache = read_through { |m| filter.call(m, context) }
end

Class Method Details

.from_context(context) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/schema/warden.rb', line 40

def self.from_context(context)
  (context.respond_to?(:warden) && context.warden) || PassThruWarden
end

.visible_entry?(visibility_method, entry, context, warden = Warden.from_context(context)) ⇒ Object?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parameters:

  • visibility_method (Symbol) —

    a Warden method to call for this entry

  • entry (Object, Array<Object>) —

    One or more definitions for a given name in a GraphQL Schema

  • context (GraphQL::Query::Context)
  • warden (Warden) (defaults to: Warden.from_context(context))

Returns:

  • (Object) —

    entry or one of entry’s items if exactly one of them is visible for this context

  • (nil) —

    If neither entry nor any of entry’s items are visible for this context



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# File 'lib/graphql/schema/warden.rb', line 50

def self.visible_entry?(visibility_method, entry, context, warden = Warden.from_context(context))
  if entry.is_a?(Array)
    visible_item = nil
    entry.each do |item|
      if warden.public_send(visibility_method, item, context)
        if visible_item.nil?
          visible_item = item
        else
          raise Schema::DuplicateNamesError, "Found two visible definitions for `#{item.path}`: #{visible_item.inspect}, #{item.inspect}"
        end
      end
    end
    visible_item
  elsif warden.public_send(visibility_method, entry, context)
    entry
  else
    nil
  end
end

Instance Method Details

#arguments(argument_owner) ⇒ Array<GraphQL::Argument>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Visible arguments on argument_owner.

Parameters:

Returns:



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# File 'lib/graphql/schema/warden.rb', line 175

def arguments(argument_owner)
  @visible_arguments ||= read_through { |o| o.arguments(@context).each_value.select { |a| visible_argument?(a) } }
  @visible_arguments[argument_owner]
end

#directives ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/schema/warden.rb', line 197

def directives
  @schema.directives.each_value.select { |d| visible?(d) }
end

#enum_values(enum_defn) ⇒ Array<GraphQL::EnumType::EnumValue>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Visible members of enum_defn.

Returns:



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# File 'lib/graphql/schema/warden.rb', line 181

def enum_values(enum_defn)
  @visible_enum_arrays ||= read_through { |e| e.enum_values(@context) }
  @visible_enum_arrays[enum_defn]
end

#fields(type_defn) ⇒ Array<GraphQL::Field>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Fields on type_defn.

Parameters:

Returns:



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# File 'lib/graphql/schema/warden.rb', line 168

def fields(type_defn)
  @visible_fields ||= read_through { |t| @schema.get_fields(t, @context).values }
  @visible_fields[type_defn]
end

#get_argument(parent_type, argument_name) ⇒ GraphQL::Argument?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The argument named argument_name on parent_type, if it exists and is visible.

Returns:

  • (GraphQL::Argument, nil) —

    The argument named argument_name on parent_type, if it exists and is visible



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# File 'lib/graphql/schema/warden.rb', line 152

def get_argument(parent_type, argument_name)
  argument = parent_type.get_argument(argument_name, @context)
  return argument if argument && visible_argument?(argument, @context)
end

#get_field(parent_type, field_name) ⇒ GraphQL::Field?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The field named field_name on parent_type, if it exists.

Returns:

  • (GraphQL::Field, nil) —

    The field named field_name on parent_type, if it exists



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# File 'lib/graphql/schema/warden.rb', line 136

def get_field(parent_type, field_name)
  @visible_parent_fields ||= read_through do |type|
    read_through do |f_name|
      field_defn = @schema.get_field(type, f_name, @context)
      if field_defn && visible_field?(field_defn, nil, type)
        field_defn
      else
        nil
      end
    end
  end

  @visible_parent_fields[parent_type][field_name]
end

#get_type(type_name) ⇒ GraphQL::BaseType?

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The type named type_name, if it exists (else nil).

Returns:



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# File 'lib/graphql/schema/warden.rb', line 111

def get_type(type_name)
  @visible_types ||= read_through do |name|
    type_defn = @schema.get_type(name, @context)
    if type_defn && visible_and_reachable_type?(type_defn)
      type_defn
    else
      nil
    end
  end

  @visible_types[type_name]
end

#interfaces(obj_type) ⇒ Array<GraphQL::InterfaceType>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Visible interfaces implemented by obj_type.

Returns:



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# File 'lib/graphql/schema/warden.rb', line 192

def interfaces(obj_type)
  @visible_interfaces ||= read_through { |t| t.interfaces(@context).select { |i| visible_type?(i) } }
  @visible_interfaces[obj_type]
end

#possible_types(type_defn) ⇒ Array<GraphQL::BaseType>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns The types which may be member of type_defn.

Returns:



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# File 'lib/graphql/schema/warden.rb', line 158

def possible_types(type_defn)
  @visible_possible_types ||= read_through { |type_defn|
    pt = @schema.possible_types(type_defn, @context)
    pt.select { |t| visible_and_reachable_type?(t) }
  }
  @visible_possible_types[type_defn]
end

#reachable_type?(type_name) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Boolean True if the type is visible and reachable in the schema.

Returns:

  • (Boolean) —

    Boolean True if the type is visible and reachable in the schema



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# File 'lib/graphql/schema/warden.rb', line 130

def reachable_type?(type_name)
  type = get_type(type_name) # rubocop:disable Development/ContextIsPassedCop -- `self` is query-aware
  type && reachable_type_set.include?(type)
end

#reachable_types ⇒ Array<GraphQL::BaseType>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Visible and reachable types in the schema.

Returns:



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# File 'lib/graphql/schema/warden.rb', line 125

def reachable_types
  @reachable_types ||= reachable_type_set.to_a
end

#root_type_for_operation(op_name) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/graphql/schema/warden.rb', line 201

def root_type_for_operation(op_name)
  root_type = @schema.root_type_for_operation(op_name)
  if root_type && visible?(root_type)
    root_type
  else
    nil
  end
end

#types ⇒ Hash<String, GraphQL::BaseType>

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns Visible types in the schema.

Returns:



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# File 'lib/graphql/schema/warden.rb', line 98

def types
  @types ||= begin
    vis_types = {}
    @schema.types(@context).each do |n, t|
      if visible_and_reachable_type?(t)
        vis_types[n] = t
      end
    end
    vis_types
  end
end

#visible_argument?(arg_defn, _ctx = nil) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/warden.rb', line 221

def visible_argument?(arg_defn, _ctx = nil)
  visible?(arg_defn) && visible_and_reachable_type?(arg_defn.type.unwrap)
end

#visible_enum_value?(enum_value, _ctx = nil) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/warden.rb', line 186

def visible_enum_value?(enum_value, _ctx = nil)
  @visible_enum_values ||= read_through { |ev| visible?(ev) }
  @visible_enum_values[enum_value]
end

#visible_field?(field_defn, _ctx = nil, owner = field_defn.owner) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Parameters:

  • owner (Class, Module) (defaults to: field_defn.owner) —

    If provided, confirm that field has the given owner.

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/warden.rb', line 211

def visible_field?(field_defn, _ctx = nil, owner = field_defn.owner)
  # This field is visible in its own right
  visible?(field_defn) &&
    # This field's return type is visible
    visible_and_reachable_type?(field_defn.type.unwrap) &&
    # This field is either defined on this object type,
    # or the interface it's inherited from is also visible
    ((field_defn.respond_to?(:owner) && field_defn.owner == owner) || field_on_visible_interface?(field_defn, owner))
end

#visible_type?(type_defn, _ctx = nil) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/warden.rb', line 225

def visible_type?(type_defn, _ctx = nil)
  @type_visibility ||= read_through { |type_defn| visible?(type_defn) }
  @type_visibility[type_defn]
end

#visible_type_membership?(type_membership, _ctx = nil) ⇒ Boolean

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns:

  • (Boolean) 


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# File 'lib/graphql/schema/warden.rb', line 230

def visible_type_membership?(type_membership, _ctx = nil)
  visible?(type_membership)
end