Top 5 Bugs from Fuel Attackathon 33351-3.rs

// ownable.sw

library;

pub struct OwnershipTransferred {
    previous_owner: b256,
    new_owner: b256,
}

pub trait StorageHelpers {
    #[storage(read)]
    fn get_owner() -> b256;

    #[storage(write)]
    fn set_owner(owner: b256);
}

pub trait Ownable : StorageHelpers {
} {

    #[storage(read)]
    fn owner() -> b256 {
        Self::get_owner()
    }

    #[storage(read)]
    fn only_owner() {
        assert(msg_sender().unwrap() == Identity::Address(Address::from(Self::get_owner())));
    }

    #[storage(write)]
    fn renounce_ownership() {
        Self::set_owner(b256::zero());
    }

    #[storage(read, write)]
    fn transfer_ownership(new_owner: b256) {
        assert(new_owner != b256::zero());
        let old_owner = Self::get_owner();
        Self::set_owner(new_owner);

        // log does not work here
        log(OwnershipTransferred {
            previous_owner: old_owner,
            new_owner: new_owner,
        })
    }
}