wallet, rpc: Output wallet flags in getwalletinfo

src/wallet/rpc/wallet.cpp

@@ -62,6 +62,10 @@ static RPCHelpMan getwalletinfo()
                         {RPCResult::Type::BOOL, "external_signer", "whether this wallet is configured to use an external signer such as a hardware wallet"},
                         {RPCResult::Type::BOOL, "blank", "Whether this wallet intentionally does not contain any keys, scripts, or descriptors"},
                         {RPCResult::Type::NUM_TIME, "birthtime", /*optional=*/true, "The start time for blocks scanning. It could be modified by (re)importing any descriptor with an earlier timestamp."},
+                        {RPCResult::Type::ARR, "flags", "The flags currently set on the wallet",
+                        {
+                            {RPCResult::Type::STR, "flag", "The name of the flag"},
+                        }},
                         RESULT_LAST_PROCESSED_BLOCK,
                     }},
                 },
@@ -121,6 +125,21 @@ static RPCHelpMan getwalletinfo()
         obj.pushKV("birthtime", birthtime);
     }
 
+    // Push known flags
+    UniValue flags(UniValue::VARR);
+    uint64_t wallet_flags = pwallet->GetWalletFlags();
+    for (uint64_t i = 0; i < 64; ++i) {
+        uint64_t flag = uint64_t{1} << i;
+        if (flag & wallet_flags) {
+            if (flag & KNOWN_WALLET_FLAGS) {
+                flags.push_back(WALLET_FLAG_TO_STRING.at(WalletFlags{flag}));
+            } else {
+                flags.push_back(strprintf("unknown_flag_%u", i));
+            }
+        }
+    }
+    obj.pushKV("flags", flags);
+
     AppendLastProcessedBlock(obj, *pwallet);
     return obj;
 },
@@ -263,7 +282,7 @@ static RPCHelpMan loadwallet()
 static RPCHelpMan setwalletflag()
 {
             std::string flags;
-            for (auto& it : WALLET_FLAG_MAP)
+            for (auto& it : STRING_TO_WALLET_FLAG)
                 if (it.second & MUTABLE_WALLET_FLAGS)
                     flags += (flags == "" ? "" : ", ") + it.first;
 
@@ -294,11 +313,11 @@ static RPCHelpMan setwalletflag()
     std::string flag_str = request.params[0].get_str();
     bool value = request.params[1].isNull() || request.params[1].get_bool();
 
-    if (!WALLET_FLAG_MAP.count(flag_str)) {
+    if (!STRING_TO_WALLET_FLAG.count(flag_str)) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Unknown wallet flag: %s", flag_str));
     }
 
-    auto flag = WALLET_FLAG_MAP.at(flag_str);
+    auto flag = STRING_TO_WALLET_FLAG.at(flag_str);
 
     if (!(flag & MUTABLE_WALLET_FLAGS)) {
         throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Wallet flag is immutable: %s", flag_str));

src/wallet/wallet.h

@@ -160,14 +160,24 @@ static constexpr uint64_t KNOWN_WALLET_FLAGS =
 static constexpr uint64_t MUTABLE_WALLET_FLAGS =
         WALLET_FLAG_AVOID_REUSE;
 
-static const std::map<std::string,WalletFlags> WALLET_FLAG_MAP{
+static const std::map<WalletFlags, std::string> WALLET_FLAG_TO_STRING{
-    {"avoid_reuse", WALLET_FLAG_AVOID_REUSE},
+    {WALLET_FLAG_AVOID_REUSE, "avoid_reuse"},
-    {"blank", WALLET_FLAG_BLANK_WALLET},
+    {WALLET_FLAG_BLANK_WALLET, "blank"},
-    {"key_origin_metadata", WALLET_FLAG_KEY_ORIGIN_METADATA},
+    {WALLET_FLAG_KEY_ORIGIN_METADATA, "key_origin_metadata"},
-    {"last_hardened_xpub_cached", WALLET_FLAG_LAST_HARDENED_XPUB_CACHED},
+    {WALLET_FLAG_LAST_HARDENED_XPUB_CACHED, "last_hardened_xpub_cached"},
-    {"disable_private_keys", WALLET_FLAG_DISABLE_PRIVATE_KEYS},
+    {WALLET_FLAG_DISABLE_PRIVATE_KEYS, "disable_private_keys"},
-    {"descriptor_wallet", WALLET_FLAG_DESCRIPTORS},
+    {WALLET_FLAG_DESCRIPTORS, "descriptor_wallet"},
-    {"external_signer", WALLET_FLAG_EXTERNAL_SIGNER}
+    {WALLET_FLAG_EXTERNAL_SIGNER, "external_signer"}
+};
+
+static const std::map<std::string, WalletFlags> STRING_TO_WALLET_FLAG{
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_AVOID_REUSE), WALLET_FLAG_AVOID_REUSE},
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_BLANK_WALLET), WALLET_FLAG_BLANK_WALLET},
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_KEY_ORIGIN_METADATA), WALLET_FLAG_KEY_ORIGIN_METADATA},
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_LAST_HARDENED_XPUB_CACHED), WALLET_FLAG_LAST_HARDENED_XPUB_CACHED},
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_DISABLE_PRIVATE_KEYS), WALLET_FLAG_DISABLE_PRIVATE_KEYS},
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_DESCRIPTORS), WALLET_FLAG_DESCRIPTORS},
+    {WALLET_FLAG_TO_STRING.at(WALLET_FLAG_EXTERNAL_SIGNER), WALLET_FLAG_EXTERNAL_SIGNER}
 };
 
 /** A wrapper to reserve an address from a wallet

test/functional/wallet_avoidreuse.py

@@ -104,7 +104,9 @@ class AvoidReuseTest(BitcoinTestFramework):
 
         # Flags should be node1.avoid_reuse=false, node2.avoid_reuse=true
         assert_equal(self.nodes[0].getwalletinfo()["avoid_reuse"], False)
+        assert_equal(sorted(self.nodes[0].getwalletinfo()["flags"]), sorted(["descriptor_wallet", "last_hardened_xpub_cached"]))
         assert_equal(self.nodes[1].getwalletinfo()["avoid_reuse"], True)
+        assert_equal(sorted(self.nodes[1].getwalletinfo()["flags"]), sorted(["descriptor_wallet", "last_hardened_xpub_cached", "avoid_reuse"]))
 
         self.restart_node(1)
         self.connect_nodes(0, 1)

test/functional/wallet_createwallet.py

@@ -44,6 +44,7 @@ class CreateWalletTest(BitcoinTestFramework):
         assert_raises_rpc_error(-4, "Error: This wallet has no available keys", w1.getrawchangeaddress)
         import_res = w1.importdescriptors([{"desc": w0.getaddressinfo(address1)['desc'], "timestamp": "now"}])
         assert_equal(import_res[0]["success"], True)
+        assert_equal(sorted(w1.getwalletinfo()["flags"]), sorted(["last_hardened_xpub_cached", "descriptor_wallet", "disable_private_keys"]))
 
         self.log.info('Test that private keys cannot be imported')
         privkey, pubkey = generate_keypair(wif=True)