state.rs

use cosmwasm_std::Storage;

pub struct RevokedPermits;

impl RevokedPermits {
    pub fn is_permit_revoked(
        storage: &dyn Storage,
        storage_prefix: &str,
        account: &str,
        permit_name: &str,
    ) -> bool {
        let storage_key = storage_prefix.to_string() + account + permit_name;

        storage.get(storage_key.as_bytes()).is_some()
    }

    pub fn revoke_permit(
        storage: &mut dyn Storage,
        storage_prefix: &str,
        account: &str,
        permit_name: &str,
    ) {
        let storage_key = storage_prefix.to_string() + account + permit_name;

        // Since cosmwasm V1.0 it's not possible to set an empty value, hence set some unimportant
        // character '_'
        //
        // Here is the line of the new panic that was added when trying to insert an empty value:
        // https://github.com/scrtlabs/cosmwasm/blob/f7e2b1dbf11e113e258d796288752503a5012367/packages/std/src/storage.rs#L30
        storage.set(storage_key.as_bytes(), "_".as_bytes())
    }
}