Andromeda
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CW721-Bids Module
A module used to interact with a CW721-Bids contract, allowing posting and accepting bids on NFTs.

Definition

The Bids module uses the cw721-bids contract in order to allow a user to sell their NFT and for buyers to bid for said NFT. It is created as another way to make a TransferAgreement.

InstantiateMsg

pub struct InstantiateMsg {
pub andromeda_cw721_contract: String,
}
Name
Type
Description
andromeda_cw721_contract
String
The address of the cw721 contract to allow bids on. Needs to be an already instantiated cw721 contract.
More information on the cw721-bids contract can be found here.

Hooks

The cw721-bids module uses the OnTransfer hook which is sent whenever we execute transferring an NFT token from one address to another.
pub enum AndromedaHook {
OnTransfer {
token_id: String,
sender: String,
recipient: String,
}
}
When the cw721-bids contract receives the hook, it will check if the recipient has an bid placed on the NFT being transferred with the recorded token_id. The assumption is that the owner transferring the token to a user that has a bid means they want to accept that bid. If the bid is expired, this message will end up failing and the transfer will not happen.
fn handle_andr_hook(deps: Deps, env: Env, msg: AndromedaHook) -> Result<Binary, ContractError> {
match msg {
AndromedaHook::OnTransfer {
token_id,
sender,
recipient,
} => {
let mut resp: Response = Response::new();
let bid = bids().may_load(deps.storage, &token_id)?;
if let Some(bid) = bid {
if bid.purchaser == recipient {
let msg = CosmosMsg::Wasm(WasmMsg::Execute {
contract_addr: env.contract.address.to_string(),
funds: vec![],
// The assumption is that the owner transfering the token to a user that has
// an bid means they want to accept that bid. If the bid is
// expired this message will end up failing and the transfer will not
// happen.
msg: encode_binary(&ExecuteMsg::AcceptBid {
token_id,
// We ensure! a recipient since the owner of the token will have
// changed once this message gets executed. Sender is assuemd to be the
// orignal owner of the token.
recipient: sender,
})?,
});
resp = resp.add_message(msg);
}
}
Ok(encode_binary(&resp)?)
}
_ => Ok(encode_binary(&None::<Response>)?),
}
}
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Outline
Definition
InstantiateMsg
Hooks