Find if user is Owner of a Sharepoint Site

Question

In my SPFX webpart, I retrieve a list of sites that the user has access to. For each of the sites, I need to find out if the user is a site owner of that site. One approach which I thought was

1. Get current user's user id in that site through: http://server/site/_api/Web/ currentUser
2. Get all groups that the user belongs to in that site using https://server/sites/projects/_api/web/GetUserById(user id)/Groups
3. Loop through results and find if title contains "Owner".

But this method could be flawed as I could create a group which has owner permissions and which does not have the word Owner in the group name/title.

So could someone please tell me how to do this? Graph Api approach is not being considered.

Answer 1

Resolved by using pnpjs

web.getCurrentUserEffectivePermissions().then((permissions)=>{

  if(web.hasPermissions(permissions,PermissionKind.ManageWeb) && web.hasPermissions(permissions,PermissionKind.ManagePermissions)&& web.hasPermissions(permissions,PermissionKind.CreateGroups))
  {
    console.log("User is site owner");
  }
  else
  {
    console.log("User is not site owner");
  }