refactor: Retire HardenedValidations amendment (#5988)

Amendments activated for more than 2 years can be retired. This change retires the HardenedValidations amendment.

include/xrpl/protocol/detail/features.macro

@@ -68,7 +68,6 @@ XRPL_FEATURE(CheckCashMakesTrustLine,    Supported::yes, VoteBehavior::DefaultNo
 XRPL_FEATURE(FlowSortStrands,            Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FEATURE(TicketBatch,                Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FEATURE(NegativeUNL,                Supported::yes, VoteBehavior::DefaultYes)
-XRPL_FEATURE(HardenedValidations,        Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FEATURE(RequireFullyCanonicalSig,   Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FEATURE(DeletableAccounts,          Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FIX    (PayChanRecipientOwnerDir,   Supported::yes, VoteBehavior::DefaultYes)
@@ -125,6 +124,7 @@ XRPL_RETIRE(Escrow)
 XRPL_RETIRE(EnforceInvariants)
 XRPL_RETIRE(FeeEscalation)
 XRPL_RETIRE(FlowCross)
+XRPL_RETIRE(HardenedValidations)
 XRPL_RETIRE(ImmediateOfferKilled)
 XRPL_RETIRE(MultiSign)
 XRPL_RETIRE(NonFungibleTokensV1_1)

src/libxrpl/protocol/STValidation.cpp

@@ -51,7 +51,6 @@ STValidation::validationFormat()
         {sfSigningPubKey,       soeREQUIRED},
         {sfSignature,           soeREQUIRED},
         {sfConsensusHash,       soeOPTIONAL},
-        // featureHardenedValidations
         {sfCookie,              soeDEFAULT},
         {sfValidatedHash,       soeOPTIONAL},
         {sfServerVersion,       soeOPTIONAL},

src/xrpld/app/consensus/RCLConsensus.cpp

@@ -831,21 +831,17 @@ RCLConsensus::Adaptor::validate(
             if (proposing)
                 v.setFlag(vfFullValidation);
 
-            if (ledger.ledger_->rules().enabled(featureHardenedValidations))
-            {
-                // Attest to the hash of what we consider to be the last fully
-                // validated ledger. This may be the hash of the ledger we are
-                // validating here, and that's fine.
-                if (auto const vl = ledgerMaster_.getValidatedLedger())
-                    v.setFieldH256(sfValidatedHash, vl->info().hash);
+            // Attest to the hash of what we consider to be the last fully
+            // validated ledger. This may be the hash of the ledger we are
+            // validating here, and that's fine.
+            if (auto const vl = ledgerMaster_.getValidatedLedger())
+                v.setFieldH256(sfValidatedHash, vl->info().hash);
 
-                v.setFieldU64(sfCookie, valCookie_);
+            v.setFieldU64(sfCookie, valCookie_);
 
-                // Report our server version every flag ledger:
-                if (ledger.ledger_->isVotingLedger())
-                    v.setFieldU64(
-                        sfServerVersion, BuildInfo::getEncodedVersion());
-            }
+            // Report our server version every flag ledger:
+            if (ledger.ledger_->isVotingLedger())
+                v.setFieldU64(sfServerVersion, BuildInfo::getEncodedVersion());
 
             // Report our load
             {

src/xrpld/app/ledger/detail/LedgerMaster.cpp

@@ -993,10 +993,10 @@ LedgerMaster::checkAccept(std::shared_ptr<Ledger const> const& ledger)
         // Check if the majority of validators run a higher version rippled
         // software. If so print a warning.
         //
-        // Once the HardenedValidations amendment is enabled, validators include
-        // their rippled software version in the validation messages of every
-        // (flag - 1) ledger. We wait for one ledger time before checking the
-        // version information to accumulate more validation messages.
+        // Validators include their rippled software version in the validation
+        // messages of every (flag - 1) ledger. We wait for one ledger time
+        // before checking the version information to accumulate more validation
+        // messages.
 
         auto currentTime = app_.timeKeeper().now();
         bool needPrint = false;