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-rw-r--r--rubocop/cop/safe_params.rb34
1 files changed, 34 insertions, 0 deletions
diff --git a/rubocop/cop/safe_params.rb b/rubocop/cop/safe_params.rb
new file mode 100644
index 00000000000..250c16232e4
--- /dev/null
+++ b/rubocop/cop/safe_params.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module RuboCop
+ module Cop
+ class SafeParams < RuboCop::Cop::Cop
+ MSG = 'Use `safe_params` instead of `params` in url_for.'.freeze
+
+ METHOD_NAME_PATTERN = :url_for
+ UNSAFE_PARAM = :params
+
+ def on_send(node)
+ return unless method_name(node) == METHOD_NAME_PATTERN
+
+ add_offense(node, location: :expression) unless safe_params?(node)
+ end
+
+ private
+
+ def safe_params?(node)
+ node.descendants.each do |param_node|
+ next unless param_node.descendants.empty?
+
+ return false if method_name(param_node) == UNSAFE_PARAM
+ end
+
+ true
+ end
+
+ def method_name(node)
+ node.children[1]
+ end
+ end
+ end
+end