Clear all writers' permissions in Google Apps Script-CodePudding

I am using scripts to draw the list of permitted writers to a document new_ID from a list in sheet_roles using

for (var j = 3; j<=last_row_role; j  ) {
  if (range_roles.getCell(j, 4).getValue() != ''){
  add_Writer_Silent(new_ID, sheet_roles.getRange(j,3).getValue())
  }
}

where

 function add_Writer_Silent(docId, userEmail) {
  var permissionResource = {
    role: 'writer',   //can also have owner / organizer / fileOrganizer / writer / commenter / reader
    type: 'user',
    value: userEmail
  };
  var optionalArgs = {
    sendNotificationEmails: false,
    supportsAllDrives: true
  };
  Drive.Permissions.insert(permissionResource, docId, optionalArgs);
}

I would like to write another function that would update the list of writers. To do so, I need to clear the permissions list first and I am unable to find a way to do it in Permissions.

Can someone help me identify a way to remove all writers' permissions from a file using scripts?

CodePudding user response：

You'll need to first list all the permissions in the file and then get the ones with the role "writer" using its ID, you can try this:

function remove_permissions(docId) {
  var optionalArgs = {
    supportsAllDrives: true
  };
  
  var permissions = Drive.Permissions.list(docId, optionalArgs); //Saving all permissions in one Object.
  for(i=0; i< permissions.items.length; i  ){ //Iterating through all items in the object.
    if(permissions.items[i].role == "writer"){
      Drive.Permissions.remove(docId, permissions.items[i].id);
    }
  }
}

Reference: