Owner Data Module

@perfect-abstractions/compose/access/Owner/Data/OwnerDataMod.solCopy

Helper functions for owner storage, reads, and owner check based on ERC-173

Key Features

• requireOwner() guards by requiring msg.sender is the stored owner.
• setContractOwner has no access control validation (Trusted initialization only).
• Emits OwnershipTransferred from setContractOwner with previousOwner == address(0).

Module Usage

You can use modules to wrap around you own project logic while using the default Compose building blocks. Modules provides all the necessary internal helpers for maximum integration.

See Facets & Modules for more information.

Storage​

State Variables​

OwnerStorage​

/** storage-location: erc8042:erc173.owner */
struct OwnerStorage {
  address owner;
}

Functions​

getStorage​

Returns a pointer to the OwnerStorage struct.

function getStorage() pure returns (OwnerStorage storage s);

Returns:

owner​

Get the address of the owner

function owner() view returns (address);

Returns:

requireOwner​

Verify if the message sender is the current diamond owner. Useful for gating specify logic inside your own facets.

function requireOwner() view;

Reverts:

setContractOwner​

Writes the inital owner address to storage and emits OwnershipTransferred(address(0), _initialOwner).

There is no msg.sender or role check performed. Use only from trusted initialization code, or wrap with your own checks in a facet.

function setContractOwner(address _initialOwner);

Parameters:

Events​

OwnershipTransferred

Emitted when the ownership changes. setContractOwner always uses previousOwner == address(0). Transfer facets typically emit with the real previous owner.

Signature:

event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

Errors​

OwnerUnauthorizedAccount

Thrown by requireOwner when msg.sender is not the curent owner. Other owner facets may also revert with this error.

Signature:

error OwnerUnauthorizedAccount();

OwnerAlreadyRenounced

Declared here for shared use (for example renounce flows). This module does not reference it; companion facets may revert with it when ownership was already renounced.

Signature:

error OwnerAlreadyRenounced();

Best Practices​

• Call setContractOwner only from trusted init paths (constructor, one-off setup). For transfers, use OwnerTransferMod.transferOwnership or an equivalent facet so events record the real previous owner.
• Guard external entrypoints with requireOwner() or equivalent before state changes restricted to the owner.

Integration Notes​

OwnerStorage is located at keccak256("erc173.owner") inside the diamond.

All Compose Owner contracts use that slot, so owner() and transfer logic observe the same address.

Last updated:June 5, 2026

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