RPC: Return external_signer in getwalletinfo

Author: kristapsk

src/wallet/rpc/wallet.cpp

@@ -57,6 +57,7 @@ static RPCHelpMan getwalletinfo()
                             {RPCResult::Type::NUM, "progress", "scanning progress percentage [0.0, 1.0]"},
                         }},
                         {RPCResult::Type::BOOL, "descriptors", "whether this wallet uses descriptors for scriptPubKey management"},
+                        {RPCResult::Type::BOOL, "external_signer", "whether this wallet is configured to use an external signer such as a hardware wallet"},
                     }},
                 },
                 RPCExamples{
@@ -117,6 +118,7 @@ static RPCHelpMan getwalletinfo()
         obj.pushKV("scanning", false);
     }
     obj.pushKV("descriptors", pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
+    obj.pushKV("external_signer", pwallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER));
     return obj;
 },
     };

test/functional/wallet_signer.py

@@ -72,10 +72,12 @@ def test_valid_signer(self):
 
         self.nodes[1].createwallet(wallet_name='hww', disable_private_keys=True, descriptors=True, external_signer=True)
         hww = self.nodes[1].get_wallet_rpc('hww')
+        assert_equal(hww.getwalletinfo()["external_signer"], True)
 
         # Flag can't be set afterwards (could be added later for non-blank descriptor based watch-only wallets)
         self.nodes[1].createwallet(wallet_name='not_hww', disable_private_keys=True, descriptors=True, external_signer=False)
         not_hww = self.nodes[1].get_wallet_rpc('not_hww')
+        assert_equal(not_hww.getwalletinfo()["external_signer"], False)
         assert_raises_rpc_error(-8, "Wallet flag is immutable: external_signer", not_hww.setwalletflag, "external_signer", True)
 
         # assert_raises_rpc_error(-4, "Multiple signers found, please specify which to use", wallet_name='not_hww', disable_private_keys=True, descriptors=True, external_signer=True)