fix: add allowClawback flag for account_info (XRPLF#4590)

* Update the `account_info` API so that the `allowClawback` flag is
  included in the response.
  * The proposed `Clawback` amendement added an `allowClawback` flag in
    the `AccountRoot` object.
  * In the API response, under `account_flags`, there is now an
    `allowClawback` field with a boolean (`true` or `false`) value.
  * For reference, the XLS-39 Clawback implementation can be found in
    XRPLF#4553

Fix XRPLF#4588

src/ripple/rpc/handlers/AccountInfo.cpp

@@ -96,6 +96,9 @@ doAccountInfo(RPC::JsonContext& context)
                  {"disallowIncomingPayChan", lsfDisallowIncomingPayChan},
                  {"disallowIncomingTrustline", lsfDisallowIncomingTrustline}}};
 
+    static constexpr std::pair<std::string_view, LedgerSpecificFlags>
+        allowClawbackFlag{"allowClawback", lsfAllowClawback};
+
     auto const sleAccepted = ledger->read(keylet::account(accountID));
     if (sleAccepted)
     {
@@ -123,6 +126,11 @@ doAccountInfo(RPC::JsonContext& context)
             for (auto const& lsf : disallowIncomingFlags)
                 acctFlags[lsf.first.data()] = sleAccepted->isFlag(lsf.second);
         }
+
+        if (ledger->rules().enabled(featureClawback))
+            acctFlags[allowClawbackFlag.first.data()] =
+                sleAccepted->isFlag(allowClawbackFlag.second);
+
         result[jss::account_flags] = std::move(acctFlags);
 
         // The document states that signer_lists is a bool, however

src/test/rpc/AccountInfo_test.cpp

@@ -519,13 +519,16 @@ class AccountInfo_test : public beast::unit_test::suite
 
         Env env(*this, features);
         Account const alice{"alice"};
-        env.fund(XRP(1000), alice);
+        Account const bob{"bob"};
+        env.fund(XRP(1000), alice, bob);
 
-        auto getAccountFlag = [&env, &alice](std::string_view fName) {
+        auto getAccountFlag = [&env](
+                                  std::string_view fName,
+                                  Account const& account) {
             auto const info = env.rpc(
                 "json",
                 "account_info",
-                R"({"account" : ")" + alice.human() + R"("})");
+                R"({"account" : ")" + account.human() + R"("})");
 
             std::optional<bool> res;
             if (info[jss::result][jss::status] == "success" &&
@@ -553,15 +556,15 @@ class AccountInfo_test : public beast::unit_test::suite
             // as expected
             env(fclear(alice, asf.second));
             env.close();
-            auto const f1 = getAccountFlag(asf.first);
+            auto const f1 = getAccountFlag(asf.first, alice);
             BEAST_EXPECT(f1.has_value());
             BEAST_EXPECT(!f1.value());
 
             // Set a flag and check that account_info returns results
             // as expected
             env(fset(alice, asf.second));
             env.close();
-            auto const f2 = getAccountFlag(asf.first);
+            auto const f2 = getAccountFlag(asf.first, alice);
             BEAST_EXPECT(f2.has_value());
             BEAST_EXPECT(f2.value());
         }
@@ -584,15 +587,15 @@ class AccountInfo_test : public beast::unit_test::suite
                 // as expected
                 env(fclear(alice, asf.second));
                 env.close();
-                auto const f1 = getAccountFlag(asf.first);
+                auto const f1 = getAccountFlag(asf.first, alice);
                 BEAST_EXPECT(f1.has_value());
                 BEAST_EXPECT(!f1.value());
 
                 // Set a flag and check that account_info returns results
                 // as expected
                 env(fset(alice, asf.second));
                 env.close();
-                auto const f2 = getAccountFlag(asf.first);
+                auto const f2 = getAccountFlag(asf.first, alice);
                 BEAST_EXPECT(f2.has_value());
                 BEAST_EXPECT(f2.value());
             }
@@ -601,9 +604,31 @@ class AccountInfo_test : public beast::unit_test::suite
         {
             for (auto& asf : disallowIncomingFlags)
             {
-                BEAST_EXPECT(!getAccountFlag(asf.first));
+                BEAST_EXPECT(!getAccountFlag(asf.first, alice));
             }
         }
+
+        static constexpr std::pair<std::string_view, std::uint32_t>
+            allowClawbackFlag{"allowClawback", asfAllowClawback};
+
+        if (features[featureClawback])
+        {
+            // must use bob's account because alice has noFreeze set
+            auto const f1 = getAccountFlag(allowClawbackFlag.first, bob);
+            BEAST_EXPECT(f1.has_value());
+            BEAST_EXPECT(!f1.value());
+
+            // Set allowClawback
+            env(fset(bob, allowClawbackFlag.second));
+            env.close();
+            auto const f2 = getAccountFlag(allowClawbackFlag.first, bob);
+            BEAST_EXPECT(f2.has_value());
+            BEAST_EXPECT(f2.value());
+        }
+        else
+        {
+            BEAST_EXPECT(!getAccountFlag(allowClawbackFlag.first, bob));
+        }
     }
 
     void
@@ -618,6 +643,8 @@ class AccountInfo_test : public beast::unit_test::suite
             ripple::test::jtx::supported_amendments()};
         testAccountFlags(allFeatures);
         testAccountFlags(allFeatures - featureDisallowIncoming);
+        testAccountFlags(
+            allFeatures - featureDisallowIncoming - featureClawback);
     }
 };