refactor(plug_context): delegate default scrubbers to Sentry.Scrubber

Removes the duplicated denylist constants, placeholder, credit-card
regex, and recursive scrub_map/scrub_list helpers from
Sentry.PlugContext in favor of the shared Sentry.Scrubber module.
Public function signatures and the documented default key sets are
unchanged.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: solnic

lib/sentry/plug_context.ex

@@ -153,9 +153,8 @@ defmodule Sentry.PlugContext do
     end
   end
 
-  @default_scrubbed_param_keys ["password", "passwd", "secret"]
-  @default_scrubbed_header_keys ["authorization", "authentication", "cookie"]
-  @scrubbed_value "*********"
+  @default_scrubbed_param_keys Sentry.Scrubber.default_param_keys()
+  @default_scrubbed_header_keys Sentry.Scrubber.default_header_keys()
   @default_plug_request_id_header "x-request-id"
 
   @doc false
@@ -256,7 +255,7 @@ defmodule Sentry.PlugContext do
   def default_header_scrubber(conn) do
     conn.req_headers
     |> Map.new()
-    |> Map.drop(@default_scrubbed_header_keys)
+    |> Sentry.Scrubber.drop_keys()
   end
 
   @doc """
@@ -268,35 +267,6 @@ defmodule Sentry.PlugContext do
   """
   @spec default_body_scrubber(Plug.Conn.t()) :: map()
   def default_body_scrubber(conn) do
-    scrub_map(conn.params, @default_scrubbed_param_keys)
+    Sentry.Scrubber.scrub_map(conn.params)
   end
-
-  defp scrub_map(map, scrubbed_keys) do
-    Map.new(map, fn {key, value} ->
-      value =
-        cond do
-          key in scrubbed_keys -> @scrubbed_value
-          is_binary(value) and value =~ credit_card_regex() -> @scrubbed_value
-          is_struct(value) -> value |> Map.from_struct() |> scrub_map(scrubbed_keys)
-          is_map(value) -> scrub_map(value, scrubbed_keys)
-          is_list(value) -> scrub_list(value, scrubbed_keys)
-          true -> value
-        end
-
-      {key, value}
-    end)
-  end
-
-  defp scrub_list(list, scrubbed_keys) do
-    Enum.map(list, fn value ->
-      cond do
-        is_struct(value) -> value |> Map.from_struct() |> scrub_map(scrubbed_keys)
-        is_map(value) -> scrub_map(value, scrubbed_keys)
-        is_list(value) -> scrub_list(value, scrubbed_keys)
-        true -> value
-      end
-    end)
-  end
-
-  defp credit_card_regex, do: ~r/^(?:\d[ -]*?){13,16}$/
 end