Icon LinkOwnership Library

The Ownership Library provides a way to block anyone other than a single "owner" from calling functions. The Ownership Library is often used when needing administrative calls on a contract by a single user.

For implementation details on the Ownership Library please see the Sway Libs Docs Icon Link.

Icon LinkImporting the Ownership Library

In order to use the Ownership library, Sway Libs and Sway Standards Icon Link must be added to the Forc.toml file and then imported into your Sway project. To add Sway Libs as a dependency to the Forc.toml file in your project please see the Getting Started . To add Sway Standards as a dependency please see the Sway Standards Book Icon Link.

To import the Ownership Library and SRC-5 Icon Link Standard to your Sway Smart Contract, add the following to your Sway file:

use sway_libs::ownership::*;
use standards::src5::*;

Icon LinkIntegrating the Ownership Library into the SRC-5 Standard

To implement the SRC-5 Icon Link standard with the Ownership library, be sure to add the Sway Standards dependency to your contract. The following demonstrates the integration of the Ownership library with the SRC-5 standard.

use sway_libs::ownership::_owner;
use standards::src5::{SRC5, State};
 
impl SRC5 for Contract {
    #[storage(read)]
    fn owner() -> State {
        _owner()
    }
}

Icon InfoCircle

NOTE A constructor method must be implemented to initialize the owner.

Icon LinkBasic Functionality

Icon LinkSetting a Contract Owner

Once imported, the Ownership Library's functions will be available. To use them initialize the owner for your contract by calling the initialize_ownership() function in your own constructor method.

#[storage(read, write)]
fn my_constructor(new_owner: Identity) {
    initialize_ownership(new_owner);
}

Icon LinkApplying Restrictions

To restrict a function to only the owner, call the only_owner() function.

#[storage(read)]
fn only_owner_may_call() {
    only_owner();
    // Only the contract's owner may reach this line.
}

Icon LinkChecking the Ownership Status

To return the ownership state from storage, call the _owner() function.

#[storage(read)]
fn get_owner_state() {
    let owner: State = _owner();
}