Add LoanBrokerCoverDeposit transaction

- Untested. Will need Withdraw to do a good test.

include/xrpl/protocol/detail/transactions.macro

@@ -554,17 +554,17 @@ TRANSACTION(ttLOAN_BROKER_DELETE, 75, LoanBrokerDelete,
     {sfLoanBrokerID, soeREQUIRED},
 }))
 
-#if 0
 /** This transaction deposits First Loss Capital into a Loan Broker */
 TRANSACTION(ttLOAN_BROKER_COVER_DEPOSIT, 76, LoanBrokerCoverDeposit, noPriv, ({
     {sfLoanBrokerID, soeREQUIRED},
-    {sfNumber, soeREQUIRED},
+    {sfAmount, soeREQUIRED},
 }))
 
+#if 0
 /** This transaction withdraws First Loss Capital from a Loan Broker */
 TRANSACTION(ttLOAN_BROKER_COVER_WITHDRAW, 77, LoanBrokerCoverWithdraw, noPriv, ({
     {sfLoanBrokerID, soeREQUIRED},
-    {sfNumber, soeREQUIRED},
+    {sfAmount, soeREQUIRED},
 }))
 
 /** This transaction creates a Loan */

src/xrpld/app/tx/detail/LoanBrokerCoverDeposit.cpp

@@ -0,0 +1,140 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2025 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include <xrpld/app/tx/detail/LoanBrokerCoverDeposit.h>
+#include <xrpld/app/tx/detail/LoanBrokerSet.h>
+#include <xrpld/ledger/ApplyView.h>
+#include <xrpld/ledger/View.h>
+
+#include <xrpl/basics/Log.h>
+#include <xrpl/basics/Number.h>
+#include <xrpl/basics/chrono.h>
+#include <xrpl/beast/utility/Journal.h>
+#include <xrpl/beast/utility/instrumentation.h>
+#include <xrpl/protocol/AccountID.h>
+#include <xrpl/protocol/Feature.h>
+#include <xrpl/protocol/Indexes.h>
+#include <xrpl/protocol/PublicKey.h>
+#include <xrpl/protocol/SField.h>
+#include <xrpl/protocol/STAmount.h>
+#include <xrpl/protocol/STNumber.h>
+#include <xrpl/protocol/STObject.h>
+#include <xrpl/protocol/TER.h>
+#include <xrpl/protocol/TxFlags.h>
+#include <xrpl/protocol/XRPAmount.h>
+
+namespace ripple {
+
+bool
+LoanBrokerCoverDeposit::isEnabled(PreflightContext const& ctx)
+{
+    return lendingProtocolEnabled(ctx);
+}
+
+std::uint32_t
+LoanBrokerCoverDeposit::getFlagsMask(PreflightContext const& ctx)
+{
+    return tfUniversalMask;
+}
+
+NotTEC
+LoanBrokerCoverDeposit::doPreflight(PreflightContext const& ctx)
+{
+    if (ctx.tx[sfLoanBrokerID] == beast::zero)
+        return temINVALID;
+
+    if (ctx.tx[sfAmount] <= beast::zero)
+        return temBAD_AMOUNT;
+
+    return tesSUCCESS;
+}
+
+TER
+LoanBrokerCoverDeposit::preclaim(PreclaimContext const& ctx)
+{
+    auto const& tx = ctx.tx;
+
+    auto const account = tx[sfAccount];
+    auto const brokerID = tx[sfLoanBrokerID];
+    auto const amount = tx[sfAmount];
+
+    auto const sleBroker = ctx.view.read(keylet::loanbroker(brokerID));
+    if (!sleBroker)
+    {
+        JLOG(ctx.j.warn()) << "LoanBroker does not exist.";
+        return tecNO_ENTRY;
+    }
+    if (account != sleBroker->at(sfOwner))
+    {
+        JLOG(ctx.j.warn()) << "Account is not the owner of the LoanBroker.";
+        return tecNO_PERMISSION;
+    }
+    auto const vault = ctx.view.read(keylet::vault(sleBroker->at(sfVaultID)));
+    auto const vaultAsset = vault->at(sfAsset);
+
+    if (amount.asset() != vaultAsset)
+        return tecWRONG_ASSET;
+
+    // Cannot transfer a frozen Asset
+    if (isFrozen(ctx.view, account, vaultAsset))
+        return vaultAsset.holds<Issue>() ? tecFROZEN : tecLOCKED;
+
+    if (accountHolds(
+            ctx.view,
+            account,
+            vaultAsset,
+            FreezeHandling::fhZERO_IF_FROZEN,
+            AuthHandling::ahZERO_IF_UNAUTHORIZED,
+            ctx.j) < amount)
+        return tecINSUFFICIENT_FUNDS;
+
+    return tesSUCCESS;
+}
+
+TER
+LoanBrokerCoverDeposit::doApply()
+{
+    auto const& tx = ctx_.tx;
+
+    auto const brokerID = tx[sfLoanBrokerID];
+    auto const amount = tx[sfAmount];
+
+    auto broker = view().peek(keylet::loanbroker(brokerID));
+
+    auto const brokerPseudoID = broker->at(sfAccount);
+
+    // Transfer assets from depositor to pseudo-account.
+    if (auto ter = accountSend(
+            view(),
+            account_,
+            brokerPseudoID,
+            amount,
+            j_,
+            WaiveTransferFee::Yes))
+        return ter;
+
+    // Increase the LoanBroker's CoverAvailable by Amount
+    broker->at(sfCoverAvailable) += amount;
+
+    return tesSUCCESS;
+}
+
+//------------------------------------------------------------------------------
+
+}  // namespace ripple

src/xrpld/app/tx/detail/LoanBrokerCoverDeposit.h

@@ -0,0 +1,56 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of rippled: https://github.com/ripple/rippled
+    Copyright (c) 2025 Ripple Labs Inc.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose  with  or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#ifndef RIPPLE_TX_LOANBROKERCOVERDEPOSIT_H_INCLUDED
+#define RIPPLE_TX_LOANBROKERCOVERDEPOSIT_H_INCLUDED
+
+#include <xrpld/app/tx/detail/Transactor.h>
+
+namespace ripple {
+
+class LoanBrokerCoverDeposit : public Transactor
+{
+public:
+    static constexpr ConsequencesFactoryType ConsequencesFactory{Normal};
+
+    explicit LoanBrokerCoverDeposit(ApplyContext& ctx) : Transactor(ctx)
+    {
+    }
+
+    static bool
+    isEnabled(PreflightContext const& ctx);
+
+    static std::uint32_t
+    getFlagsMask(PreflightContext const& ctx);
+
+    static NotTEC
+    doPreflight(PreflightContext const& ctx);
+
+    static TER
+    preclaim(PreclaimContext const& ctx);
+
+    TER
+    doApply() override;
+};
+
+//------------------------------------------------------------------------------
+
+}  // namespace ripple
+
+#endif

src/xrpld/app/tx/detail/applySteps.cpp

@@ -41,6 +41,7 @@
 #include <xrpld/app/tx/detail/DepositPreauth.h>
 #include <xrpld/app/tx/detail/Escrow.h>
 #include <xrpld/app/tx/detail/LedgerStateFix.h>
+#include <xrpld/app/tx/detail/LoanBrokerCoverDeposit.h>
 #include <xrpld/app/tx/detail/LoanBrokerDelete.h>
 #include <xrpld/app/tx/detail/LoanBrokerSet.h>
 #include <xrpld/app/tx/detail/MPTokenAuthorize.h>