feat: XLS-68: Sponsor, #5887 continuation

cspell.config.yaml

@@ -271,6 +271,8 @@ words:
   - sles
   - soci
   - socidb
+  - sponsee
+  - sponsees
   - SRPMS
   - sslws
   - statsd

include/xrpl/ledger/helpers/AccountRootHelpers.h

@@ -33,9 +33,96 @@ isGlobalFrozen(ReadView const& view, AccountID const& issuer);
 [[nodiscard]] XRPAmount
 xrpLiquid(ReadView const& view, AccountID const& id, std::int32_t ownerCountAdj, beast::Journal j);
 
+/** Returns the account reserve, in drops.
+    Actual owner count can be adjusted by delta in ownerCountAdj
+    The reserve is calculated as
+       (ownerCount + "sponsoring object count" - "sponsored object count" + additionalOwnerCount) *
+   increment + (1 if not sponsored account + sponsoringAccountCount) * "reserve base"
+*/
+[[nodiscard]] XRPAmount
+accountReserve(
+    ReadView const& view,
+    SLE::const_ref sle,
+    beast::Journal j,
+    std::int32_t ownerCountAdj = 0,
+    std::int32_t reserveCountAdj = 0);
+
+[[nodiscard]] inline XRPAmount
+accountReserve(
+    ReadView const& view,
+    AccountID const& id,
+    beast::Journal j,
+    std::int32_t ownerCountAdj = 0,
+    std::int32_t reserveCountAdj = 0)
+{
+    return accountReserve(view, view.read(keylet::account(id)), j, ownerCountAdj, reserveCountAdj);
+}
+
+XRPAmount
+baseAccountReserve(ReadView const& view, std::int32_t ownerCount);
+
+[[nodiscard]] TER
+checkInsufficientReserve(
+    ReadView const& view,
+    STTx const& tx,
+    SLE::const_ref accSle,
+    STAmount const& accBalance,
+    SLE::const_ref sponsorSle,
+    std::int32_t ownerCountDelta,
+    std::int32_t reserveCountDelta = 0,
+    beast::Journal j = beast::Journal{beast::Journal::getNullSink()});
+
+std::uint32_t
+ownerCount(
+    ReadView const& view,
+    SLE::const_ref sle,
+    beast::Journal j,
+    std::int32_t ownerCountAdj = 0);
+
 /** Adjust the owner count up or down. */
 void
-adjustOwnerCount(ApplyView& view, SLE::ref sle, std::int32_t amount, beast::Journal j);
+adjustOwnerCount(
+    ApplyView& view,
+    SLE::ref accountSle,
+    SLE::ref sponsorSle,
+    std::int32_t amount,
+    beast::Journal j = beast::Journal{beast::Journal::getNullSink()});
+
+inline void
+adjustOwnerCount(
+    ApplyView& view,
+    AccountID const& account,
+    std::optional<AccountID> const& sponsor,
+    std::int32_t amount,
+    beast::Journal j = beast::Journal{beast::Journal::getNullSink()})
+{
+    adjustOwnerCount(
+        view,
+        view.peek(keylet::account(account)),
+        sponsor ? view.peek(keylet::account(*sponsor)) : SLE::pointer(),
+        amount,
+        j);
+}
+
+void
+adjustOwnerCountObj(
+    ApplyView& view,
+    SLE::ref accountSle,
+    SLE::ref objectSle,
+    std::int32_t amount,
+    beast::Journal j = beast::Journal{beast::Journal::getNullSink()});
+
+inline void
+adjustOwnerCountObj(
+    ApplyView& view,
+    AccountID const& account,
+    SLE::ref objectSle,
+    std::int32_t amount,
+    beast::Journal j = beast::Journal{beast::Journal::getNullSink()})
+{
+    SLE::ref accountSle = view.peek(keylet::account(account));
+    adjustOwnerCountObj(view, accountSle, objectSle, amount, j);
+}
 
 /** Returns IOU issuer transfer fee as Rate. Rate specifies
  * the fee as fractions of 1 billion. For example, 1% transfer rate
@@ -71,7 +158,7 @@ getPseudoAccountFields();
     - null pointer
 */
 [[nodiscard]] bool
-isPseudoAccount(SLE::const_pointer sleAcct, std::set<SField const*> const& pseudoFieldFilter = {});
+isPseudoAccount(SLE::const_ref sleAcct, std::set<SField const*> const& pseudoFieldFilter = {});
 
 /** Convenience overload that reads the account from the view. */
 [[nodiscard]] inline bool

include/xrpl/ledger/helpers/EscrowHelpers.h

@@ -6,6 +6,7 @@
 #include <xrpl/ledger/helpers/AccountRootHelpers.h>
 #include <xrpl/ledger/helpers/MPTokenHelpers.h>
 #include <xrpl/ledger/helpers/RippleStateHelpers.h>
+#include <xrpl/ledger/helpers/SponsorHelpers.h>
 #include <xrpl/protocol/Feature.h>
 #include <xrpl/protocol/Indexes.h>
 #include <xrpl/protocol/MPTAmount.h>
@@ -17,6 +18,7 @@ template <ValidIssueType T>
 TER
 escrowUnlockApplyHelper(
     ApplyView& view,
+    STTx const& tx,
     Rate lockedRate,
     SLE::ref sleDest,
     STAmount const& xrpBalance,
@@ -31,6 +33,7 @@ template <>
 inline TER
 escrowUnlockApplyHelper<Issue>(
     ApplyView& view,
+    STTx const& tx,
     Rate lockedRate,
     SLE::ref sleDest,
     STAmount const& xrpBalance,
@@ -56,8 +59,13 @@ escrowUnlockApplyHelper<Issue>(
     if (!view.exists(trustLineKey) && createAsset)
     {
         // Can the account cover the trust line's reserve?
-        if (std::uint32_t const ownerCount = {sleDest->at(sfOwnerCount)};
-            xrpBalance < view.fees().accountReserve(ownerCount + 1))
+        auto const sponsorSle = getTxReserveSponsor(view, tx);
+        if (!sponsorSle)
+            return sponsorSle.error();  // LCOV_EXCL_LINE
+
+        if (auto const ret =
+                checkInsufficientReserve(view, tx, sleDest, xrpBalance, *sponsorSle, 1, 0, journal);
+            !isTesSuccess(ret))
         {
             JLOG(journal.trace()) << "Trust line does not exist. "
                                      "Insufficient reserve to create line.";
@@ -84,6 +92,7 @@ escrowUnlockApplyHelper<Issue>(
                 Issue(currency, receiver),           // limit of zero
                 0,                                   // quality in
                 0,                                   // quality out
+                *sponsorSle,                         // sponsor
                 journal);                            // journal
             !isTesSuccess(ter))
         {
@@ -161,6 +170,7 @@ template <>
 inline TER
 escrowUnlockApplyHelper<MPTIssue>(
     ApplyView& view,
+    STTx const& tx,
     Rate lockedRate,
     SLE::ref sleDest,
     STAmount const& xrpBalance,
@@ -176,24 +186,31 @@ escrowUnlockApplyHelper<MPTIssue>(
 
     auto const mptID = amount.get<MPTIssue>().getMptID();
     auto const issuanceKey = keylet::mptIssuance(mptID);
-    if (!view.exists(keylet::mptoken(issuanceKey.key, receiver)) && createAsset && !receiverIssuer)
+    auto const mptKeylet = keylet::mptoken(issuanceKey.key, receiver);
+    if (!view.exists(mptKeylet) && createAsset && !receiverIssuer)
     {
-        if (std::uint32_t const ownerCount = {sleDest->at(sfOwnerCount)};
-            xrpBalance < view.fees().accountReserve(ownerCount + 1))
-        {
-            return tecINSUFFICIENT_RESERVE;
-        }
+        auto const sponsorSle = getTxReserveSponsor(view, tx);
+        if (!sponsorSle)
+            return sponsorSle.error();  // LCOV_EXCL_LINE
 
-        if (auto const ter = createMPToken(view, mptID, receiver, 0); !isTesSuccess(ter))
+        if (auto const ret =
+                checkInsufficientReserve(view, tx, sleDest, xrpBalance, *sponsorSle, 1, 0, journal);
+            !isTesSuccess(ret))
+            return ret;
+
+        if (auto const ter = createMPToken(view, mptID, receiver, *sponsorSle, 0);
+            !isTesSuccess(ter))
         {
             return ter;  // LCOV_EXCL_LINE
         }
 
         // update owner count.
-        adjustOwnerCount(view, sleDest, 1, journal);
+        adjustOwnerCount(view, sleDest, *sponsorSle, 1, journal);
+        auto mptSle = view.peek(mptKeylet);
+        addSponsorToLedgerEntry(mptSle, *sponsorSle);
     }
 
-    if (!view.exists(keylet::mptoken(issuanceKey.key, receiver)) && !receiverIssuer)
+    if (!view.exists(mptKeylet) && !receiverIssuer)
         return tecNO_PERMISSION;
 
     auto const xferRate = transferRate(view, amount);

include/xrpl/ledger/helpers/MPTokenHelpers.h

@@ -72,6 +72,7 @@ canAddHolding(ReadView const& view, MPTIssue const& mptIssue);
 [[nodiscard]] TER
 authorizeMPToken(
     ApplyView& view,
+    STTx const& tx,
     XRPAmount const& priorBalance,
     MPTID const& mptIssuanceID,
     AccountID const& account,
@@ -103,6 +104,7 @@ requireAuth(
 [[nodiscard]] TER
 enforceMPTokenAuthorization(
     ApplyView& view,
+    STTx const& tx,
     MPTID const& mptIssuanceID,
     AccountID const& account,
     XRPAmount const& priorBalance,
@@ -189,6 +191,7 @@ canMPTTradeAndTransfer(
 [[nodiscard]] TER
 addEmptyHolding(
     ApplyView& view,
+    STTx const& tx,
     AccountID const& accountID,
     XRPAmount priorBalance,
     MPTIssue const& mptIssue,
@@ -197,6 +200,7 @@ addEmptyHolding(
 [[nodiscard]] TER
 removeEmptyHolding(
     ApplyView& view,
+    STTx const& tx,
     AccountID const& accountID,
     MPTIssue const& mptIssue,
     beast::Journal journal);
@@ -228,13 +232,15 @@ createMPToken(
     ApplyView& view,
     MPTID const& mptIssuanceID,
     AccountID const& account,
+    SLE::ref sponsorSle,
     std::uint32_t const flags);
 
 TER
 checkCreateMPT(
     xrpl::ApplyView& view,
     xrpl::MPTIssue const& mptIssue,
     xrpl::AccountID const& holder,
+    SLE::ref sponsorSle,
     beast::Journal j);
 
 //------------------------------------------------------------------------------

include/xrpl/ledger/helpers/NFTokenHelpers.h

@@ -39,7 +39,7 @@ findTokenAndPage(ApplyView& view, AccountID const& owner, uint256 const& nftoken
 
 /** Insert the token in the owner's token directory. */
 TER
-insertToken(ApplyView& view, AccountID owner, STObject&& nft);
+insertToken(ApplyView& view, STTx const& tx, AccountID owner, SLE::ref sponsorSle, STObject&& nft);
 
 /** Remove the token from the owner's token directory. */
 TER
@@ -107,6 +107,7 @@ tokenOfferCreatePreclaim(
 TER
 tokenOfferCreateApply(
     ApplyView& view,
+    STTx const& tx,
     AccountID const& acctID,
     STAmount const& amount,
     std::optional<AccountID> const& dest,

include/xrpl/ledger/helpers/RippleStateHelpers.h

@@ -149,6 +149,7 @@ trustCreate(
                                 // Issuer should be the account being set.
     std::uint32_t uQualityIn,
     std::uint32_t uQualityOut,
+    SLE::ref sponsorSle,
     beast::Journal j);
 
 [[nodiscard]] TER
@@ -229,6 +230,7 @@ canTransfer(ReadView const& view, Issue const& issue, AccountID const& from, Acc
 [[nodiscard]] TER
 addEmptyHolding(
     ApplyView& view,
+    STTx const& tx,
     AccountID const& accountID,
     XRPAmount priorBalance,
     Issue const& issue,