Class: GraphQL::StaticValidation::DocumentDoesNotExceedMaxDepth

Inherits:
Object
  • Object
show all
Includes:
Message::MessageHelper
Defined in:
lib/graphql/static_validation/rules/document_does_not_exceed_max_depth.rb

Instance Method Summary collapse

Methods included from Message::MessageHelper

#message

Instance Method Details

#validate(context) ⇒ Object



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
# File 'lib/graphql/static_validation/rules/document_does_not_exceed_max_depth.rb', line 6

def validate(context)
  max_allowed_depth = context.query.max_depth
  return if max_allowed_depth.nil?

  visitor = context.visitor

  # operation or fragment name
  current_field_scope = nil
  current_depth = 0
  skip_current_scope = false

  # {name => depth} pairs for operations and fragments
  depths = Hash.new { |h, k| h[k] = 0 }

  # {name => [fragmentName...]} pairs
  fragments = Hash.new { |h, k| h[k] = []}

  visitor[GraphQL::Language::Nodes::Document].leave << -> (node, parent) {
    context.errors.none? && assert_under_max_depth(context, max_allowed_depth, depths, fragments)
  }

  visitor[GraphQL::Language::Nodes::OperationDefinition] << -> (node, parent) {
    current_field_scope = node.name
  }

  visitor[GraphQL::Language::Nodes::FragmentDefinition] << -> (node, parent) {
    current_field_scope = node.name
  }

  visitor[GraphQL::Language::Nodes::Field] << -> (node, parent) {
    # Don't validate queries on __schema, __type
    skip_current_scope ||= context.skip_field?(node.name)

    if node.selections.any? && !skip_current_scope
      current_depth += 1
      if current_depth > depths[current_field_scope]
        depths[current_field_scope] = current_depth
      end
    end
  }

  visitor[GraphQL::Language::Nodes::Field].leave << -> (node, parent) {
    if skip_current_scope && context.skip_field?(node.name)
      skip_current_scope = false
    elsif node.selections.any?
      current_depth -= 1
    end
  }

  visitor [GraphQL::Language::Nodes::FragmentSpread] << -> (node, parent) {
    fragments[current_field_scope] << node.name
  }
end