[Url Generators] Expose URL Generator functionality on server side

[stacey-gammon]

Url generator service needs to be available to alerting and chat ops.

Merging together quite a few ideas and I think we can solve this really simply while keeping all url generator implementations on the client side.

Common helper function

   createUrlGeneratorAppUrl(
     id: GeneratorId,
    state: GeneratorStateMapping[GeneratorId]['State']
   ) => `${hostAndBasePath}\goto?id=${id}&state=${rison.encode(JSON.stringify(state))}`

That can be used server side! e.g. Chat Ops pseudocode:

  const { timeRange, dashboardId } = parseDashboardChatCommand(command);
  const linkToDashboard = createUrlGeneratorAppUrl(DASHBOARD_APP_URL_GENERATOR, { time: timeRange, dashboardId });
 return...

Alerting pseudocode:

  const { id, state } = alertSavedObject.url;
  const link = createUrlGeneratorAppUrl(id, state);
  return...

Url generator service registers a new app, goto with functionality like:

const generator = urlGeneratorsService.get(param.id);
if (generator.isDeprecated) {
  const { id, state } = generator.migrate(param.state);
  notifications.toastWarning('This url is deprecated, update your bookmarks to ${createGoTogeneratorUrl(id, state)}`);
}
window.location.href = urlGeneratorsService.get(param.id).createUrl(param.state)

An improvement could be server side validation, exposed rest api, but this will likely be sufficient for all the new features that need it, so the priority is not quite their imo, to pursue.

cc @bmcconaghy

[elasticmachine]

Pinging @elastic/kibana-app-arch (Team:AppArch)

[darnautov]

@stacey-gammon having this definitely would be beneficial for alerting. We need to generate URLs for alert actions and at the moment it's not possible, because our URL generator utilizes setStateToKbnUrl from kibana_utils/public, which relies on the window object under the hood.

[stacey-gammon]

@streamich - this may be something to add into the new URL service work.

[ppisljar]

Thank you for contributing to this issue, however, we are closing this issue due to inactivity as part of a backlog grooming effort. If you believe this feature/bug should still be considered, please reopen with a comment.

[darnautov]

@elastic/kibana-app-services is there a plan to support URL locators server-side eventually? cc @streamich @Dosant