Fix/allow double signer

auction-house/program/src/bid/mod.rs

@@ -752,6 +752,8 @@ pub fn bid_logic<'info>(
                 ],
             )?;
         }
+
+        #[allow(clippy::explicit_auto_deref)]
         sol_memset(
             *ts_info.try_borrow_mut_data()?,
             trade_state_bump,
@@ -954,6 +956,7 @@ pub fn auctioneer_bid_logic<'info>(
                 ],
             )?;
         }
+        #[allow(clippy::explicit_auto_deref)]
         sol_memset(
             *ts_info.try_borrow_mut_data()?,
             trade_state_bump,

auction-house/program/src/cancel/mod.rs

@@ -360,6 +360,8 @@ fn cancel_logic<'c, 'info>(
         .lamports()
         .checked_add(curr_lamp)
         .ok_or(AuctionHouseError::NumericalOverflow)?;
+
+    #[allow(clippy::explicit_auto_deref)]
     sol_memset(*trade_state.try_borrow_mut_data()?, 0, TRADE_STATE_SIZE);
 
     Ok(())

auction-house/program/src/lib.rs

@@ -3,6 +3,8 @@
 //!
 //! Full docs can be found [here](https://docs.metaplex.com/auction-house/definition).
 
+#![allow(clippy::result_large_err)]
+
 pub mod auctioneer;
 pub mod bid;
 pub mod cancel;

auction-house/program/src/sell/mod.rs

@@ -397,8 +397,7 @@ fn sell_logic<'c, 'info>(
     // 1. The wallet being a signer is the only condition in which an NFT can sell at a price of 0.
     //    If the user does list at 0 then auction house can change the sale price if the 'can_change_sale_price' option is true.
     // 2. If the trade is not priced at 0, the wallet holder has to be a signer since auction house cannot sign if listing over 0.
-    // 3. There must be one and only one signer; there can never be zero signers or two signers.
-    // 4. Auction house should be the signer for changing the price instead of user wallet for cases when seller lists at 0.
+    // 3. Auction house should be the signer for changing the price instead of user wallet for cases when seller lists at 0.
     if !wallet.to_account_info().is_signer
         && (buyer_price == 0
             || free_seller_trade_state.data_is_empty()
@@ -407,9 +406,6 @@ fn sell_logic<'c, 'info>(
     {
         return Err(AuctionHouseError::SaleRequiresSigner.into());
     }
-    if wallet.to_account_info().is_signer && authority.to_account_info().is_signer {
-        return Err(AuctionHouseError::SaleRequiresExactlyOneSigner.into());
-    }
 
     let auction_house_key = auction_house.key();
 

auction-house/program/src/utils.rs

@@ -713,11 +713,8 @@ pub fn close_account<'a>(
         .checked_add(current_lamports)
         .ok_or(AuctionHouseError::NumericalOverflow)?;
 
-    sol_memset(
-        &mut *source_account.try_borrow_mut_data()?,
-        0,
-        account_data_size,
-    );
+    #[allow(clippy::explicit_auto_deref)]
+    sol_memset(*source_account.try_borrow_mut_data()?, 0, account_data_size);
 
     Ok(())
 }

auction-house/program/tests/sell.rs

@@ -16,6 +16,7 @@ use solana_sdk::{signer::Signer, sysvar::clock::Clock};
 use std::assert_eq;
 
 use solana_program::borsh::try_from_slice_unchecked;
+
 #[tokio::test]
 async fn sell_success() {
     let mut context = auction_house_program_test().start_with_context().await;
@@ -344,3 +345,97 @@ async fn auctioneer_sell_no_delegate_fails() {
 
     assert_error!(error, ACCOUNT_NOT_INITIALIZED);
 }
+
+#[tokio::test]
+async fn multiple_signers() {
+    let mut context = auction_house_program_test().start_with_context().await;
+    // Payer Wallet
+    let (ah, ahkey, ah_auth) = existing_auction_house_test_context(&mut context)
+        .await
+        .unwrap();
+
+    let test_metadata = Metadata::new();
+
+    let owner_pubkey = &test_metadata.token.pubkey();
+    airdrop(&mut context, owner_pubkey, TEN_SOL).await.unwrap();
+
+    airdrop(&mut context, &ah_auth.pubkey(), TEN_SOL)
+        .await
+        .unwrap();
+
+    airdrop(&mut context, &test_metadata.token.pubkey(), TEN_SOL)
+        .await
+        .unwrap();
+
+    airdrop(&mut context, &ah.auction_house_fee_account, TEN_SOL)
+        .await
+        .unwrap();
+
+    context.warp_to_slot(100).unwrap();
+
+    test_metadata
+        .create(
+            &mut context,
+            "Test".to_string(),
+            "TST".to_string(),
+            "uri".to_string(),
+            None,
+            10,
+            false,
+            1,
+        )
+        .await
+        .unwrap();
+    let ((acc, listing_receipt_acc), sell_tx) = sell_multiple_signers(
+        &mut context,
+        &ahkey,
+        &ah,
+        &test_metadata,
+        &test_metadata.token,
+        ah_auth,
+        1,
+        1,
+    );
+
+    context
+        .banks_client
+        .process_transaction(sell_tx)
+        .await
+        .unwrap();
+
+    let sts = context
+        .banks_client
+        .get_account(acc.seller_trade_state)
+        .await
+        .expect("Error Getting Trade State")
+        .expect("Trade State Empty");
+    assert_eq!(sts.data.len(), 1);
+
+    let timestamp = context
+        .banks_client
+        .get_sysvar::<Clock>()
+        .await
+        .unwrap()
+        .unix_timestamp;
+
+    let listing_receipt_account = context
+        .banks_client
+        .get_account(listing_receipt_acc.receipt)
+        .await
+        .expect("getting listing receipt")
+        .expect("empty listing receipt data");
+
+    let listing_receipt =
+        ListingReceipt::try_deserialize(&mut listing_receipt_account.data.as_ref()).unwrap();
+
+    assert_eq!(listing_receipt.auction_house, acc.auction_house);
+    assert_eq!(listing_receipt.metadata, acc.metadata);
+    assert_eq!(listing_receipt.seller, acc.wallet);
+    assert_eq!(listing_receipt.created_at, timestamp);
+    assert_eq!(listing_receipt.purchase_receipt, None);
+    assert_eq!(listing_receipt.canceled_at, None);
+    assert_eq!(listing_receipt.bookkeeper, *owner_pubkey);
+    assert_eq!(listing_receipt.seller, *owner_pubkey);
+    assert_eq!(listing_receipt.price, 1);
+    assert_eq!(listing_receipt.token_size, 1);
+}

auction-house/program/tests/utils/setup_functions.rs

@@ -1020,6 +1020,110 @@ pub fn sell(
     )
 }
 
+pub fn sell_multiple_signers(
+    context: &mut ProgramTestContext,
+    ahkey: &Pubkey,
+    ah: &AuctionHouse,
+    test_metadata: &Metadata,
+    signer: &Keypair,
+    authority: Keypair,
+    sale_price: u64,
+    token_size: u64,
+) -> (
+    (
+        mpl_auction_house::accounts::Sell,
+        mpl_auction_house::accounts::PrintListingReceipt,
+    ),
+    Transaction,
+) {
+    let program_id = mpl_auction_house::id();
+
+    let token = get_associated_token_address(&signer.pubkey(), &test_metadata.mint.pubkey());
+
+    let (seller_trade_state, sts_bump) = find_trade_state_address(
+        &signer.pubkey(),
+        ahkey,
+        &token,
+        &ah.treasury_mint,
+        &test_metadata.mint.pubkey(),
+        sale_price,
+        token_size,
+    );
+    let (listing_receipt, receipt_bump) = find_listing_receipt_address(&seller_trade_state);
+
+    let (free_seller_trade_state, free_sts_bump) = find_trade_state_address(
+        &signer.pubkey(),
+        ahkey,
+        &token,
+        &ah.treasury_mint,
+        &test_metadata.mint.pubkey(),
+        0,
+        token_size,
+    );
+    let (pas, pas_bump) = find_program_as_signer_address();
+
+    let accounts = mpl_auction_house::accounts::Sell {
+        wallet: signer.pubkey(),
+        token_account: token,
+        metadata: test_metadata.pubkey,
+        authority: ah.authority,
+        auction_house: *ahkey,
+        auction_house_fee_account: ah.auction_house_fee_account,
+        seller_trade_state,
+        free_seller_trade_state,
+        token_program: spl_token::id(),
+        system_program: solana_program::system_program::id(),
+        program_as_signer: pas,
+        rent: sysvar::rent::id(),
+    };
+    let mut account_metas = accounts.to_account_metas(None);
+
+    for account in account_metas.iter_mut() {
+        if account.pubkey == ah.authority {
+            account.is_signer = true;
+        }
+    }
+
+    let data = mpl_auction_house::instruction::Sell {
+        trade_state_bump: sts_bump,
+        free_trade_state_bump: free_sts_bump,
+        program_as_signer_bump: pas_bump,
+        token_size,
+        buyer_price: sale_price,
+    }
+    .data();
+
+    let instruction = Instruction {
+        program_id,
+        data,
+        accounts: account_metas,
+    };
+
+    let listing_receipt_accounts = mpl_auction_house::accounts::PrintListingReceipt {
+        receipt: listing_receipt,
+        bookkeeper: signer.pubkey(),
+        system_program: system_program::id(),
+        rent: sysvar::rent::id(),
+        instruction: sysvar::instructions::id(),
+    };
+
+    let print_receipt_instruction = Instruction {
+        program_id,
+        data: mpl_auction_house::instruction::PrintListingReceipt { receipt_bump }.data(),
+        accounts: listing_receipt_accounts.to_account_metas(None),
+    };
+
+    (
+        (accounts, listing_receipt_accounts),
+        Transaction::new_signed_with_payer(
+            &[instruction, print_receipt_instruction],
+            Some(&signer.pubkey()),
+            &[signer, &authority],
+            context.last_blockhash,
+        ),
+    )
+}
+
 pub fn sell_pnft(
     context: &mut ProgramTestContext,
     ahkey: &Pubkey,
@@ -1479,8 +1583,10 @@ pub async fn existing_auction_house_test_context(
     let t_mint_key = spl_token::native_mint::id();
     let tdw_ata = twd_key;
     let seller_fee_basis_points: u16 = 100;
+
     let authority = Keypair::new();
     airdrop(context, &authority.pubkey(), 10_000_000_000).await?;
+
     // Derive Auction House Key
     let (auction_house_address, bump) =
         find_auction_house_address(&authority.pubkey(), &t_mint_key);
@@ -1489,6 +1595,7 @@ pub async fn existing_auction_house_test_context(
     // Derive Auction House Treasury Key
     let (auction_house_treasury_key, treasury_bump) =
         find_auction_house_treasury_address(&auction_house_address);
+
     let auction_house = create_auction_house(
         context,
         &authority,
@@ -1554,7 +1661,7 @@ pub async fn create_sale_delegate_rule_set(
         .rule_set_pda(ruleset_addr)
         .payer(creator.pubkey())
         .build(CreateOrUpdateArgs::V1 {
-            serialized_rule_set: serialized_rule_set,
+            serialized_rule_set,
         })
         .unwrap()
         .instruction();