Fix ASM setting for automated user events.

The automated user events feature has two settings: enable and mode. Both can be configured
via code or using a single ENV var: DD_APPSEC_AUTOMATED_USER_EVENTS_TRACKING

The corner case found is that setting DD_APPSEC_AUTOMATED_USER_EVENTS_TRACKING=extended|safe
is disabling automated user events.

This PR ensures the enabled setting supports extended and safe as valid values.

lib/datadog/appsec/configuration/settings.rb

@@ -15,6 +15,10 @@ module Settings
           'safe',
           'extended'
         ].freeze
+        APPSEC_VALID_TRACK_USER_EVENTS_ENABLED_VALUES = [
+          '1',
+          'true'
+        ].concat(APPSEC_VALID_TRACK_USER_EVENTS_MODE).freeze
 
         def self.extended(base)
           base = base.singleton_class unless base.is_a?(Class)
@@ -100,7 +104,7 @@ def self.add_settings!(base)
                     if env_value == 'disabled'
                       false
                     else
-                      ['1', 'true'].include?(env_value.strip.downcase)
+                      APPSEC_VALID_TRACK_USER_EVENTS_ENABLED_VALUES.include?(env_value.strip.downcase)
                     end
                   end
                 end
@@ -112,6 +116,8 @@ def self.add_settings!(base)
                   o.setter do |v|
                     if APPSEC_VALID_TRACK_USER_EVENTS_MODE.include?(v)
                       v
+                    elsif v == 'disabled'
+                      'safe'
                     else
                       Datadog.logger.warn(
                         'The appsec.track_user_events.mode value provided is not supported.' \

spec/datadog/appsec/configuration/settings_spec.rb

@@ -475,6 +475,14 @@ def patcher
 
               it { is_expected.to eq(false) }
             end
+
+            context 'using the mode values: extended | safe' do
+              ['extended', 'safe'].each do |value|
+                let(:track_user_events_enabled) { value }
+
+                it { is_expected.to eq(true) }
+              end
+            end
           end
         end
       end