# `gno.land/p/nym-moultest123/ownable`

> 🚧 **API sketch, not an implementation.** The types below are declared; the
> two composition helpers `panic("not implemented")`. Nothing here works yet.
> Do not import it expecting behaviour.

A proposal for one `Owner` interface covering every kind of thing that can own
a realm, so that ownership checks stop being written four different ways.

```go
type Owner interface {
	Addr() address
	Kind() Kind
	owner()   // unexported: only this package may implement Owner
}
```

Four owner kinds are declared: `UserOwner` (an address), `RealmOwner` (a
`runtime.Realm`), `MembstoreOwner` and `DAOOwner` (both still empty structs,
waiting on the membstore and dao interfaces).

The part worth keeping is the composition idea: ownership as an expression
rather than a single address.

```go
func And(a Owner, b ...Owner) Owner   // panics today
func Or(a Owner, b ...Owner) Owner    // panics today
```

`Or(user, dao)` is "the owner, or the DAO that can override them".
`And(a, b)` is a 2-of-2. Today every realm hardcodes one of these shapes.

The tests pin the surface on purpose: they assert that `And` and `Or` panic, so
implementing one is a visible change to this package rather than a silent shift
in behaviour for whoever imported it.

Recovered from an unmerged upstream proposal. For ownership that works today,
use [`p/nt/ownable`](https://github.com/gnolang/gno/tree/master/examples/gno.land/p/nt/ownable)
or [`p/moul/authz`](../authz).

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Part of **[moul/gno-contracts](https://github.com/moul/gno-contracts)** — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.

> ⚠️ **Disclaimer:** provided as-is, without warranty; not security-audited. Full disclaimer: [DISCLAIMER](https://github.com/moul/gno-contracts/blob/main/DISCLAIMER.md).

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