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# frozen_string_literal: true
module Gitlab
module Graphql
module Authorize
class AuthorizeFieldService
def initialize(field)
@field = field
@old_resolve_proc = @field.resolve_proc
end
def authorizations?
authorizations.present?
end
def authorized_resolve
proc do |parent_typed_object, args, ctx|
resolved_obj = @old_resolve_proc.call(parent_typed_object, args, ctx)
authorizing_obj = authorize_against(parent_typed_object)
checker = build_checker(ctx[:current_user], authorizing_obj)
if resolved_obj.respond_to?(:then)
resolved_obj.then(&checker)
else
checker.call(resolved_obj)
end
end
end
private
def authorizations
@authorizations ||= (type_authorizations + field_authorizations).uniq
end
# Returns any authorize metadata from the return type of @field
def type_authorizations
type = @field.type
# When the return type of @field is a collection, find the singular type
if type.get_field('edges')
type = node_type_for_relay_connection(type)
elsif type.list?
type = node_type_for_basic_connection(type)
end
Array.wrap(type.metadata[:authorize])
end
# Returns any authorize metadata from @field
def field_authorizations
Array.wrap(@field.metadata[:authorize])
end
# If it's a built-in/scalar type, authorize using its parent object.
# nil means authorize using the resolved object
def authorize_against(parent_typed_object)
parent_typed_object.object if built_in_type? && parent_typed_object.respond_to?(:object)
end
def build_checker(current_user, authorizing_obj)
lambda do |resolved_obj|
# Load the elements if they were not loaded by BatchLoader yet
resolved_obj = resolved_obj.sync if resolved_obj.respond_to?(:sync)
check = lambda do |object|
authorizations.all? do |ability|
Ability.allowed?(current_user, ability, authorizing_obj || object)
end
end
case resolved_obj
when Array, ActiveRecord::Relation
resolved_obj.select(&check)
else
resolved_obj if check.call(resolved_obj)
end
end
end
# Returns the singular type for relay connections.
# This will be the type class of edges.node
def node_type_for_relay_connection(type)
type = type.get_field('edges').type.unwrap.get_field('node')&.type
if type.nil?
raise Gitlab::Graphql::Errors::ConnectionDefinitionError,
'Connection Type must conform to the Relay Cursor Connections Specification'
end
type
end
# Returns the singular type for basic connections, for example `[Types::ProjectType]`
def node_type_for_basic_connection(type)
type.unwrap
end
def built_in_type?
GraphQL::Schema::BUILT_IN_TYPES.has_value?(node_type_for_basic_connection(@field.type))
end
end
end
end
end
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