isCronJobRequest function Null safety

bool isCronJobRequest(
  1. HttpRequest request
)

Returns true, if the incoming request is an AppEngine cron job request.

To schedule cron jobs for your application, you must create a cron.yaml file in the project root alongside your app.yaml. The following is an example of such a cron.yaml file:

cron:
- description: 'daily database cleanup job'
  url: '/tasks/database-cleanup'
  schedule: 'every 24 hours'
  target: 'default'

When the cronjob from the example above is triggered AppEngine will send an HTTP request to the default service for the resource /tasks/database-cleanup. In practice anyone can instigate such a request, but AppEngine will send the request from '10.0.0.1' and include a special header. This function will validate the origin of the request to ensure that it does indeed originate from AppEngine's cron job scheduler.

Implementation

bool isCronJobRequest(HttpRequest request) {
  return request.headers['X-Appengine-Cron']?.contains('true') == true;
}