fixHookNameValidation Amendment

include/xrpl/protocol/detail/features.macro

@@ -34,6 +34,7 @@
 // If you add an amendment here, then do not forget to increment `numFeatures`
 // in include/xrpl/protocol/Feature.h.
 
+XRPL_FIX    (HookNameValidation,         Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FIX    (HookMap,                    Supported::yes, VoteBehavior::DefaultYes)
 XRPL_FIX    (GuardDepth32,               Supported::yes, VoteBehavior::DefaultNo)
 XRPL_FEATURE(NamedHooks,                 Supported::yes, VoteBehavior::DefaultNo)

src/test/app/SetHook_test.cpp

@@ -2002,11 +2002,35 @@ public:
             BEAST_EXPECT(!env.meta()->isFieldPresent(sfHookEmissions));
         }
 
-        // Call named hook with the wrong hook name
+        // Call named hook with the wrong hook name (size == 0)
+        for (auto const fix : {true, false})
+        {
+            auto f = features - fixHookNameValidation;
+            if (fix)
+                f = f | fixHookNameValidation;
+            Env env{*this, f};
+
+            env.fund(XRP(10000), alice);
+            // execute both named and non-named hooks
+
+            auto jv = invoke::invoke(alice);
+            jv[jss::HookName] = "";
+
+            auto const expected = fix ? ter(temMALFORMED) : ter(tesSUCCESS);
+            env(jv,
+                M("Call named hook with the wrong hook name (size == 0)"),
+                HSFEE,
+                ter(expected));
+            env.close();
+        }
+
+        // Call named hook with the wrong hook name (size > 0)
         {
             auto jv = invoke::invoke(alice);
             jv[jss::HookName] = "41424345";
-            env(jv, M("Call named hook with the wrong hook name"), HSFEE);
+            env(jv,
+                M("Call named hook with the wrong hook name (size > 0)"),
+                HSFEE);
             env.close();
             // execute only non-named hook
             BEAST_EXPECT(!env.meta()->isFieldPresent(sfHookEmissions));

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

@@ -155,7 +155,11 @@ preflight1(PreflightContext const& ctx)
             !ctx.rules.enabled(featureNamedHooks))
             return temMALFORMED;
 
-        if (!SetHook::validateHookName(ctx.tx.getFieldVL(sfHookName), ctx.j))
+        auto const& name = ctx.tx.getFieldVL(sfHookName);
+
+        if (name.size() == 0 && ctx.rules.enabled(fixHookNameValidation))
+            return temMALFORMED;
+        if (!SetHook::validateHookName(name, ctx.j))
             return temMALFORMED;
     }