Function permit_pvp 

pub fn permit_pvp(
    alignments: &ReadStorage<'_, Alignment>,
    players: &ReadStorage<'_, Player>,
    entered_auras: &ReadStorage<'_, EnteredAuras>,
    id_maps: &IdMaps,
    attacker: Option<Entity>,
    target: Entity,
) -> bool

Function that checks for unintentional PvP between players.

Returns false if attack will create unintentional conflict, e.g. if player with PvE mode will harm pets of other players or other players will do the same to such player.

If both players have PvP mode enabled, interact with NPC and in any other case, this function will return true