[8.8] [ResponseOps] Throwing a mustache error when validating action …

…message for warnings (#158668) (#158776)

# Backport

This will backport the following commits from `main` to `8.8`:
- [[ResponseOps] Throwing a mustache error when validating action
message for warnings
(#158668)](#158668)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Alexi
Doak","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-05-31T20:26:24Z","message":"[ResponseOps]
Throwing a mustache error when validating action message for warnings
(#158668)\n\nResolves
https://github.com/elastic/kibana/issues/158666\r\n\r\n##
Summary\r\n\r\nAdds a try/catch around `mustache.parse` to catch and
ignore any errors\r\nwhen validating the action message for
warnings.\r\n\r\n\r\n### Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n\r\n\r\n### To
verify\r\n\r\n- Create a rule and add a slack connector, and open dev
tools console\r\n- In the action message type `{{` - verify that an
error is not thrown\r\nand that you can add the second open curly
brace","sha":"15b31c62ba8d4a115c359d9bb723147866bbd34c","branchLabelMapping":{"^v8.9.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["bug","release_note:fix","Team:ResponseOps","v8.9.0","v8.8.1"],"number":158668,"url":"https://github.com/elastic/kibana/pull/158668","mergeCommit":{"message":"[ResponseOps]
Throwing a mustache error when validating action message for warnings
(#158668)\n\nResolves
https://github.com/elastic/kibana/issues/158666\r\n\r\n##
Summary\r\n\r\nAdds a try/catch around `mustache.parse` to catch and
ignore any errors\r\nwhen validating the action message for
warnings.\r\n\r\n\r\n### Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n\r\n\r\n### To
verify\r\n\r\n- Create a rule and add a slack connector, and open dev
tools console\r\n- In the action message type `{{` - verify that an
error is not thrown\r\nand that you can add the second open curly
brace","sha":"15b31c62ba8d4a115c359d9bb723147866bbd34c"}},"sourceBranch":"main","suggestedTargetBranches":["8.8"],"targetPullRequestStates":[{"branch":"main","label":"v8.9.0","labelRegex":"^v8.9.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/158668","number":158668,"mergeCommit":{"message":"[ResponseOps]
Throwing a mustache error when validating action message for warnings
(#158668)\n\nResolves
https://github.com/elastic/kibana/issues/158666\r\n\r\n##
Summary\r\n\r\nAdds a try/catch around `mustache.parse` to catch and
ignore any errors\r\nwhen validating the action message for
warnings.\r\n\r\n\r\n### Checklist\r\n\r\n- [x] [Unit or
functional\r\ntests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)\r\nwere
updated or added to match the most common scenarios\r\n\r\n\r\n### To
verify\r\n\r\n- Create a rule and add a slack connector, and open dev
tools console\r\n- In the action message type `{{` - verify that an
error is not thrown\r\nand that you can add the second open curly
brace","sha":"15b31c62ba8d4a115c359d9bb723147866bbd34c"}},{"branch":"8.8","label":"v8.8.1","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"}]}]
BACKPORT-->

Co-authored-by: Alexi Doak <[email protected]>

x-pack/plugins/triggers_actions_ui/public/application/lib/validate_params_for_warnings.test.ts

@@ -51,4 +51,8 @@ describe('validateParamsForWarnings', () => {
   test('does not returns warnings when publicUrl is not set and the value is not a string', () => {
     expect(validateParamsForWarnings(10, undefined, actionVariables)).toBeFalsy();
   });
+
+  test('does not throw an error when passing in invalid mustache', () => {
+    expect(() => validateParamsForWarnings('{{', undefined, actionVariables)).not.toThrowError();
+  });
 });

x-pack/plugins/triggers_actions_ui/public/application/lib/validate_params_for_warnings.ts

@@ -31,14 +31,20 @@ export function validateParamsForWarnings(
       return acc;
     }, new Array<string>());
 
-    const variables = new Set(
-      (Mustache.parse(value) as Array<[string, string]>)
-        .filter(([type]) => type === 'name')
-        .map(([, v]) => v)
-    );
-    const hasUrlFields = some(publicUrlFields, (publicUrlField) => variables.has(publicUrlField));
-    if (hasUrlFields) {
-      return publicUrlWarning;
+    try {
+      const variables = new Set(
+        (Mustache.parse(value) as Array<[string, string]>)
+          .filter(([type]) => type === 'name')
+          .map(([, v]) => v)
+      );
+      const hasUrlFields = some(publicUrlFields, (publicUrlField) => variables.has(publicUrlField));
+      if (hasUrlFields) {
+        return publicUrlWarning;
+      }
+    } catch (e) {
+      /*
+       * do nothing, we don't care if the mustache is invalid
+       */
     }
   }
   return null;