feat: Redact anonymous attributes within feature events

contract-tests/service.rb

@@ -37,6 +37,7 @@
       'event-sampling',
       'context-comparison',
       'inline-context',
+      'anonymous-redaction',
     ],
   }.to_json
 end

lib/ldclient-rb/events.rb

@@ -460,6 +460,7 @@ class EventOutputFormatter
 
     def initialize(config)
       @context_filter = LaunchDarkly::Impl::ContextFilter.new(config.all_attributes_private, config.private_attributes)
+      @anonymous_context_filter = LaunchDarkly::Impl::ContextFilter.new(true, [])
     end
 
     # Transforms events into the format used for event sending.
@@ -481,12 +482,19 @@ def make_output_events(events, summary)
           key: event.key,
           value: event.value,
         }
+
+        out[:context] = if event.context.get_value('anonymous')
+          @anonymous_context_filter.filter(event.context)
+        else
+          @context_filter.filter(event.context)
+        end
+
         out[:default] = event.default unless event.default.nil?
         out[:variation] = event.variation unless event.variation.nil?
         out[:version] = event.version unless event.version.nil?
         out[:prereqOf] = event.prereq_of unless event.prereq_of.nil?
-        out[:context] = @context_filter.filter(event.context)
         out[:reason] = event.reason unless event.reason.nil?
+
         out
 
       when LaunchDarkly::Impl::MigrationOpEvent

spec/events_spec.rb

@@ -634,10 +634,14 @@ def identify_event(config, context, timestamp = starting_timestamp)
     #
     def feature_event(config, flag, context, variation, value, timestamp = starting_timestamp)
       context_filter = Impl::ContextFilter.new(config.all_attributes_private, config.private_attributes)
+      anonymous_filter = Impl::ContextFilter.new(true, [])
+
+      redacted_context = context.get_value('anonymous') ? anonymous_filter.filter(context) : context_filter.filter(context)
+
       out = {
         kind: 'feature',
         creationDate: timestamp,
-        context: context_filter.filter(context),
+        context: redacted_context,
         key: flag[:key],
         variation: variation,
         version: flag[:version],