# IForwarder

Interface for contracts that manage liquidity on Mangrove on behalf of multiple offer makers

## NewOwnedOffer

```solidity
event NewOwnedOffer(bytes32 olKeyHash, uint256 offerId, address owner)
```

Logging new offer owner\
By emitting this data, an indexer will be able to keep track of the real owner of an offer

### Parameters

| Name      | Type    | Description                                                                                  |
| --------- | ------- | -------------------------------------------------------------------------------------------- |
| olKeyHash | bytes32 | the hash of the offer list key. This is indexed to allow RPC calls to filter on it.          |
| offerId   | uint256 | the Mangrove offer id. This is indexed to allow RPC calls to filter on it.                   |
| owner     | address | the offer maker that can manage the offer. It is indexed to allow RPC calls to filter on it. |

## offerOwners

```solidity
function offerOwners(bytes32 olKeyHash, uint256[] offerIds) external view returns (address[] offer_owners)
```

view on offer owners.

*if `offerIds[i]==address(0)` if and only if this offer has no owner.*

### Parameters

| Name      | Type       | Description                                      |
| --------- | ---------- | ------------------------------------------------ |
| olKeyHash | bytes32    | the hash of the offer list key.                  |
| offerIds  | uint256\[] | an array of offer identifiers on the offer list. |

### Return Values

| Name          | Type       | Description                                                                               |
| ------------- | ---------- | ----------------------------------------------------------------------------------------- |
| offer\_owners | address\[] | an array of the same length where the address at position i is the owner of `offerIds[i]` |

## ownerOf

```solidity
function ownerOf(bytes32 olKeyHash, uint256 offerId) external view returns (address owner)
```

view on an offer owner.

*`ownerOf(in,out,id)` is equivalent to `offerOwners(in, out, [id])` but more gas efficient.*

### Parameters

| Name      | Type    | Description                             |
| --------- | ------- | --------------------------------------- |
| olKeyHash | bytes32 | the hash of the offer list key.         |
| offerId   | uint256 | the offer identifier on the offer list. |

### Return Values

| Name  | Type    | Description                                |
| ----- | ------- | ------------------------------------------ |
| owner | address | the offer maker that can manage the offer. |


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