[Security Solution] Fix cursor jumping to end of text area when editing Rule Action Message

x-pack/plugins/security_solution/public/detection_engine/rule_management_ui/components/rules_table/bulk_actions/forms/rule_actions_form.tsx

@@ -41,7 +41,7 @@ import {
 import { getAllActionMessageParams } from '../../../../../../detections/pages/detection_engine/rules/helpers';
 
 import { RuleActionsField } from '../../../../../../detections/components/rules/rule_actions_field';
-import { validateRuleActionsField } from '../../../../../../detections/containers/detection_engine/rules/validate_rule_actions_field';
+import { debouncedValidateRuleActionsField } from '../../../../../../detections/containers/detection_engine/rules/validate_rule_actions_field';
 
 const CommonUseField = getUseField({ component: Field });
 
@@ -61,7 +61,10 @@ const getFormSchema = (
   actions: {
     validations: [
       {
-        validator: validateRuleActionsField(actionTypeRegistry),
+        // Debounced validator not explicitly necessary here as the `RuleActionsFormData` form doesn't exhibit the same
+        // behavior as the `ActionsStepRule` form outlined in https://github.com/elastic/kibana/issues/142217, however
+        // additional renders are prevented so using for consistency
+        validator: debouncedValidateRuleActionsField(actionTypeRegistry),
       },
     ],
   },

x-pack/plugins/security_solution/public/detections/components/rules/rule_actions_field/index.tsx

@@ -64,6 +64,10 @@ export const RuleActionsField: React.FC<Props> = ({ field, messageVariables }) =
     triggersActionsUi: { getActionForm },
   } = useKibana().services;
 
+  // Workaround for setAlertActionsProperty being fired with prevProps when followed by setActionIdByIndex
+  // For details see: https://github.com/elastic/kibana/issues/142217
+  const [isInitializingAction, setIsInitializingAction] = useState(false);
+
   const actions: RuleAction[] = useMemo(
     () => (!isEmpty(field.value) ? (field.value as RuleAction[]) : []),
     [field.value]
@@ -83,6 +87,9 @@ export const RuleActionsField: React.FC<Props> = ({ field, messageVariables }) =
   const setActionIdByIndex = useCallback(
     (id: string, index: number) => {
       const updatedActions = [...(actions as Array<Partial<RuleAction>>)];
+      if (isEmpty(updatedActions[index].params)) {
+        setIsInitializingAction(true);
+      }
       updatedActions[index] = deepMerge(updatedActions[index], { id });
       field.setValue(updatedActions);
     },
@@ -98,24 +105,30 @@ export const RuleActionsField: React.FC<Props> = ({ field, messageVariables }) =
     (key: string, value: RuleActionParam, index: number) => {
       // validation is not triggered correctly when actions params updated (more details in https://github.com/elastic/kibana/issues/142217)
       // wrapping field.setValue in setTimeout fixes the issue above
-      // and triggers validation after params have been updated
-      setTimeout(
-        () =>
-          field.setValue((prevValue: RuleAction[]) => {
-            const updatedActions = [...prevValue];
-            updatedActions[index] = {
-              ...updatedActions[index],
-              params: {
-                ...updatedActions[index].params,
-                [key]: value,
-              },
-            };
-            return updatedActions;
-          }),
-        0
-      );
+      // and triggers validation after params have been updated, however it introduced a new issue where any additional input
+      // would result in the cursor jumping to the end of the text area (https://github.com/elastic/kibana/issues/149885)
+      const updateValue = () => {
+        field.setValue((prevValue: RuleAction[]) => {
+          const updatedActions = [...prevValue];
+          updatedActions[index] = {
+            ...updatedActions[index],
+            params: {
+              ...updatedActions[index].params,
+              [key]: value,
+            },
+          };
+          return updatedActions;
+        });
+      };
+
+      if (isInitializingAction) {
+        setTimeout(updateValue, 0);
+        setIsInitializingAction(false);
+      } else {
+        updateValue();
+      }
     },
-    [field]
+    [field, isInitializingAction]
   );
 
   const actionForm = useMemo(

x-pack/plugins/security_solution/public/detections/components/rules/step_rule_actions/get_schema.ts

@@ -8,7 +8,7 @@
 import { i18n } from '@kbn/i18n';
 
 import type { ActionTypeRegistryContract } from '@kbn/triggers-actions-ui-plugin/public';
-import { validateRuleActionsField } from '../../../containers/detection_engine/rules/validate_rule_actions_field';
+import { debouncedValidateRuleActionsField } from '../../../containers/detection_engine/rules/validate_rule_actions_field';
 
 import type { FormSchema } from '../../../../shared_imports';
 import type { ActionsStepRule } from '../../../pages/detection_engine/rules/types';
@@ -21,7 +21,9 @@ export const getSchema = ({
   actions: {
     validations: [
       {
-        validator: validateRuleActionsField(actionTypeRegistry),
+        // Debounced validator is necessary here to prevent error validation
+        // flashing when first adding an action. Also prevents additional renders
+        validator: debouncedValidateRuleActionsField(actionTypeRegistry),
       },
     ],
   },

x-pack/plugins/security_solution/public/detections/containers/detection_engine/rules/validate_rule_actions_field/index.tsx

@@ -6,3 +6,4 @@
  */
 
 export { validateRuleActionsField } from './validate_rule_actions_field';
+export { debouncedValidateRuleActionsField } from './validate_rule_actions_field';

x-pack/plugins/security_solution/public/detections/containers/detection_engine/rules/validate_rule_actions_field/validate_rule_actions_field.ts

@@ -7,13 +7,22 @@
 
 /* istanbul ignore file */
 
+import type {
+  ValidationCancelablePromise,
+  ValidationFuncArg,
+  ValidationResponsePromise,
+} from '@kbn/es-ui-shared-plugin/static/forms/hook_form_lib';
 import type {
   RuleAction,
   ActionTypeRegistryContract,
 } from '@kbn/triggers-actions-ui-plugin/public';
-import type { ValidationFunc, ERROR_CODE, ValidationError } from '../../../../../shared_imports';
+import type { RuleActionsFormData } from '../../../../../detection_engine/rule_management_ui/components/rules_table/bulk_actions/forms/rule_actions_form';
+import type { ActionsStepRule } from '../../../../pages/detection_engine/rules/types';
+import type { ValidationFunc, ERROR_CODE } from '../../../../../shared_imports';
 import { getActionTypeName, validateMustache, validateActionParams } from './utils';
 
+export const DEFAULT_VALIDATION_TIMEOUT = 100;
+
 export const validateSingleAction = async (
   actionItem: RuleAction,
   actionTypeRegistry: ActionTypeRegistryContract
@@ -26,9 +35,7 @@ export const validateSingleAction = async (
 
 export const validateRuleActionsField =
   (actionTypeRegistry: ActionTypeRegistryContract) =>
-  async (
-    ...data: Parameters<ValidationFunc>
-  ): Promise<ValidationError<ERROR_CODE> | void | undefined> => {
+  async (...data: Parameters<ValidationFunc>): ValidationResponsePromise<ERROR_CODE> => {
     const [{ value, path }] = data as [{ value: RuleAction[]; path: string }];
 
     const errors = [];
@@ -51,3 +58,40 @@ export const validateRuleActionsField =
       };
     }
   };
+
+/**
+ * Debounces validation by canceling previous validation requests. Essentially leveraging the async validation
+ * cancellation behavior from the hook_form_lib. Necessary to prevent error validation flashing when first adding an
+ * action until root cause of https://github.com/elastic/kibana/issues/142217 is found
+ *
+ * See docs for details:
+ * https://docs.elastic.dev/form-lib/examples/validation#cancel-asynchronous-validation
+ *
+ * Note: _.throttle/debounce does not have async support, and so not used https://github.com/lodash/lodash/issues/4815.
+ *
+ * @param actionTypeRegistry
+ * @param defaultValidationTimeout
+ */
+export const debouncedValidateRuleActionsField =
+  (
+    actionTypeRegistry: ActionTypeRegistryContract,
+    defaultValidationTimeout = DEFAULT_VALIDATION_TIMEOUT
+  ) =>
+  (data: ValidationFuncArg<ActionsStepRule | RuleActionsFormData>): ValidationResponsePromise => {
+    let isCanceled = false;
+    const promise: ValidationCancelablePromise = new Promise((resolve) => {
+      setTimeout(() => {
+        if (isCanceled) {
+          resolve();
+        } else {
+          resolve(validateRuleActionsField(actionTypeRegistry)(data));
+        }
+      }, defaultValidationTimeout);
+    });
+
+    promise.cancel = () => {
+      isCanceled = true;
+    };
+
+    return promise;
+  };