Disabling notifications for observers

[sbattis_groton]

This is likely not the first time this has been asked. I want to turn off notifications for observers from the courses where they are enrolled only as an observer (i.e. leaving their regular notifications enabled in courses where they are, say, the teacher).

This _feels_ like it should be setting somewhere. But…

I know that in the UI I can disable notifications from a course as _a_ user.

I know that I can replicate this _for myself_ via GraphQL (see `DisableCourseNotifications` below). And that I can pull out a list of all active observers via GraphQL (e.g. `AllObservers`) below. But I can't figure out how to wed the two together to then go ahead and disable the notifications for those observers in GraphQL, not least because the `updateNotificationPreferences` seems to only operate for the active user, and it's not apparent to me how to masquerade as another user in GraphQL..

Meanwhile, I can also pull an equivalent list of active observers from the REST API. And I can masquerade as other users in the REST API. But I cannot disable notifications at the course level via the REST API (unless I'm missing something). I can disable _categories_ of notification (e.g. `course_content`) but not from specific courses.

I can even tie this together offline, e.g. writing a script to pull the list of observers and then apply the mutation for each observer one at a time… if I could only masquerade in GraphQL.

Anyone of insights or suggestions?

mutation DisableCourseNotifications($courseId: ID!) {
  updateNotificationPreferences(
    input: {contextType: Course, courseId: $courseId, isPolicyOverride: true, enabled: false}
  ) {
    user {
      _id
      notificationPreferencesEnabled(contextType: Course, courseId: $courseId)
      notificationPreferences {
        channels {
          _id
          path
          pathType
          notificationPolicyOverrides(contextType: Course, courseId: $courseId) {
            notification {
              _id
              category
              categoryDisplayName
              name
              __typename
            }
            __typename
          }
          __typename
        }
        __typename
      }
      __typename
    }
    errors {
      message
      __typename
    }
    __typename
  }
}

query AllObservers {
  __typename
  allCourses {
    _id
    enrollmentsConnection(filter: {types: ObserverEnrollment, states: active}) {
      nodes {
        user {
          _id
          email
          name
        }
      }
    }
  }
}