[8.15] [Synthetics] URL validation softens to allow vars usage !! (#1…

…97797) (#197841)

# Backport

This will backport the following commits from `main` to `8.15`:
- [[Synthetics] URL validation softens to allow vars usage !!
(#197797)](#197797)

<!--- Backport version: 8.9.8 -->

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

<!--BACKPORT
[{"author":{"name":"Shahzad","email":"[email protected]"},"sourceCommit":{"committedDate":"2024-10-25T14:33:26Z","message":"[Synthetics]
URL validation softens to allow vars usage !! (#197797)\n\n##
Summary\r\n\r\nURL validation softens to allow vars usage !!\r\n\r\nFor
example \r\n\r\n` should urls: \"${url}\" interpolate --params
'{\"url\":
\"my-url\"}'`","sha":"3b05b6a7a83df7ff8b929dbbb60c639cc11101d8","branchLabelMapping":{"^v9.0.0$":"main","^v8.17.0$":"8.x","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:skip","v9.0.0","backport:prev-major","ci:project-deploy-observability","Team:obs-ux-management"],"number":197797,"url":"https://github.com/elastic/kibana/pull/197797","mergeCommit":{"message":"[Synthetics]
URL validation softens to allow vars usage !! (#197797)\n\n##
Summary\r\n\r\nURL validation softens to allow vars usage !!\r\n\r\nFor
example \r\n\r\n` should urls: \"${url}\" interpolate --params
'{\"url\":
\"my-url\"}'`","sha":"3b05b6a7a83df7ff8b929dbbb60c639cc11101d8"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.0.0","labelRegex":"^v9.0.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/197797","number":197797,"mergeCommit":{"message":"[Synthetics]
URL validation softens to allow vars usage !! (#197797)\n\n##
Summary\r\n\r\nURL validation softens to allow vars usage !!\r\n\r\nFor
example \r\n\r\n` should urls: \"${url}\" interpolate --params
'{\"url\":
\"my-url\"}'`","sha":"3b05b6a7a83df7ff8b929dbbb60c639cc11101d8"}},{"url":"https://github.com/elastic/kibana/pull/197838","number":197838,"branch":"8.16","state":"OPEN"},{"url":"https://github.com/elastic/kibana/pull/197839","number":197839,"branch":"8.x","state":"OPEN"}]}]
BACKPORT-->

x-pack/plugins/observability_solution/synthetics/server/synthetics_service/project_monitor/normalizers/common_fields.test.ts

@@ -21,6 +21,14 @@ describe('isValidUrl', () => {
   it('returns true for valid URL', () => {
     expect(isValidURL('https://elastic.co')).toBeTruthy();
   });
+
+  it('returns skips validation vars', () => {
+    expect(isValidURL('${urlParam}')).toBeTruthy();
+  });
+
+  it('returns skips validation vars with http', () => {
+    expect(isValidURL('http://${urlParam}')).toBeTruthy();
+  });
 });
 
 describe('getUrlsField', () => {

x-pack/plugins/observability_solution/synthetics/server/synthetics_service/project_monitor/normalizers/common_fields.ts

@@ -8,6 +8,7 @@
 import { omit, uniqBy } from 'lodash';
 import { i18n } from '@kbn/i18n';
 import { isValidNamespace } from '@kbn/fleet-plugin/common';
+import { hasNoParams } from '../../formatters/formatting_utils';
 import { PrivateLocationAttributes } from '../../../runtime_types/private_locations';
 import { formatLocation } from '../../../../common/utils/location_formatter';
 import {
@@ -407,6 +408,10 @@ export const getOptionalListField = (value?: string[] | string): string[] => {
  * @returns `true` if `new URL` does not throw an error, `false` otherwise
  */
 export const isValidURL = (url: string): boolean => {
+  if (!hasNoParams(url)) {
+    // this is done to avoid parsing urls with variables
+    return true;
+  }
   try {
     new URL(url);
     return true;