diff options
Diffstat (limited to 'lib/gitlab/graphql/query_analyzers/recursion_analyzer.rb')
| -rw-r--r-- | lib/gitlab/graphql/query_analyzers/recursion_analyzer.rb | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/lib/gitlab/graphql/query_analyzers/recursion_analyzer.rb b/lib/gitlab/graphql/query_analyzers/recursion_analyzer.rb deleted file mode 100644 index 79a7104a2ff..00000000000 --- a/lib/gitlab/graphql/query_analyzers/recursion_analyzer.rb +++ /dev/null @@ -1,62 +0,0 @@ -# frozen_string_literal: true - -# Recursive queries, with relatively low effort, can quickly spiral out of control exponentially -# and may not be picked up by depth and complexity alone. -module Gitlab - module Graphql - module QueryAnalyzers - class RecursionAnalyzer - IGNORED_FIELDS = %w(node edges nodes ofType).freeze - RECURSION_THRESHOLD = 2 - - def initial_value(query) - { - recurring_fields: {} - } - end - - def call(memo, visit_type, irep_node) - return memo if skip_node?(irep_node) - - node_name = irep_node.ast_node.name - times_encountered = memo[node_name] || 0 - - if visit_type == :enter - times_encountered += 1 - memo[:recurring_fields][node_name] = times_encountered if recursion_too_deep?(node_name, times_encountered) - else - times_encountered -= 1 - end - - memo[node_name] = times_encountered - memo - end - - def final_value(memo) - recurring_fields = memo[:recurring_fields] - recurring_fields = recurring_fields.select { |k, v| recursion_too_deep?(k, v) } - if recurring_fields.any? - GraphQL::AnalysisError.new("Recursive query - too many of fields '#{recurring_fields}' detected in single branch of the query") - end - end - - private - - def recursion_too_deep?(node_name, times_encountered) - return if IGNORED_FIELDS.include?(node_name) - - times_encountered > recursion_threshold - end - - def skip_node?(irep_node) - ast_node = irep_node.ast_node - !ast_node.is_a?(GraphQL::Language::Nodes::Field) || ast_node.selections.empty? - end - - def recursion_threshold - RECURSION_THRESHOLD - end - end - end - end -end |