# ProxyAdmin

[Git Source](https://github.com/Ion-Protocol/ion-protocol/blob/88cc595825f1dc2eb738fb93e172a3e8ab7a5c43/src/admin/ProxyAdmin.sol)

**Inherits:** Ownable2Step

Copy OpenZeppelin's `ProxyAdmin` that uses `Ownable2Step` instead of `Ownable`

*This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.*

### [State Variables](https://docs.ionprotocol.io/devs/smart-contract-architecture/admin/broken-reference) <a href="#state-variables" id="state-variables"></a>

#### [UPGRADE\_INTERFACE\_VERSION](https://docs.ionprotocol.io/devs/smart-contract-architecture/admin/broken-reference) <a href="#upgrade_interface_version" id="upgrade_interface_version"></a>

*The version of the upgrade interface of the contract. If this getter is missing, both `upgrade(address)` and `upgradeAndCall(address,bytes)` are present, and `upgradeTo` must be used if no function should be called, while `upgradeAndCall` will invoke the `receive` function if the second argument is the empty byte string. If the getter returns `"5.0.0"`, only `upgradeAndCall(address,bytes)` is present, and the second argument must be the empty byte string if no function should be called, making it impossible to invoke the `receive` function during an upgrade.*

```
string public constant UPGRADE_INTERFACE_VERSION = "5.0.0";
```

### [Functions](https://docs.ionprotocol.io/devs/smart-contract-architecture/admin/broken-reference) <a href="#functions" id="functions"></a>

#### [constructor](https://docs.ionprotocol.io/devs/smart-contract-architecture/admin/broken-reference) <a href="#constructor" id="constructor"></a>

*Sets the initial owner who can perform upgrades.*

```
constructor(address initialOwner) Ownable(initialOwner);
```

#### [upgradeAndCall](https://docs.ionprotocol.io/devs/smart-contract-architecture/admin/broken-reference) <a href="#upgradeandcall" id="upgradeandcall"></a>

\*Upgrades `proxy` to `implementation` and calls a function on the new implementation. See [TransparentUpgradeableProxy-\_dispatchUpgradeToAndCall](https://about/src/admin/TransparentUpgradeableProxy.sol/contract.TransparentUpgradeableProxy.html#_dispatchupgradetoandcall). Requirements:

* This contract must be the admin of `proxy`.
* If `data` is empty, `msg.value` must be zero.\*

```
function upgradeAndCall(
    ITransparentUpgradeableProxy proxy,
    address implementation,
    bytes memory data
)
    public
    payable
    virtual
    onlyOwner;
```