Making players take no damage?

I was wondering if there was a way so players can not take damage from other players. I'm creating a building server and trying to make sure no-one is killed on sight.

Regards,
JP.

 

Add the method code to a new plugin or to the main class of a existing plugin.
Than can only a player or admin with permission myserver.admin do damage to other players.

Code:

private void OnEntityHealthChange(EntityDamageEvent e) {
    if (e == null) return;
    if (e.Damage == null) return;
    if (e.Damage.DamageSource == null) return;
    if (e.Damage.Damager == null) return;
    if (e.Entity == null) return;
    if (e.Entity == e.Damage.DamageSource) return;    string damageSource = e.Damage.Damager.name.ToString();
    if (e.Damage.DamageSource.IsPlayer && e.Entity.IsPlayer) {
        if(!e.Damage.DamageSource.Owner.HasPermission("myserver.admin")) {
            e.Damage.Amount = 0f;
            e.Damage.ImpactDamage = 0f;
            e.Damage.MiscDamage = 0f;
        }
    }
}