Merge bitcoin#21277: wallet: listdescriptors uses normalized descriptor form

a69c3b3 wallet: listdescriptors uses normalized descriptor form (Ivan Metlushko)

Pull request description:

  Rationale: show importable descriptors with `listdescriptors` RPC

  It uses bitcoin#19136 to derive xpub at the last hardened step.

  **Before**:
  ```
  [
      {
        "desc": "wpkh(tpubD6NzVbkrYhZ4YUQRJL49TWw1VR5v3QKUNYaGGMUfJUm19x5ZqQ2hEiPiYbAQvD2nHoPGQGPg3snLPM8sjmYpvx7XQhkmyfk8xhsUwKbXzyh/84'/1'/0'/0/*)#p4cn3erf",
        "timestamp": 1613982591,
        "active": true,
        "internal": false,
        "range": [
          0,
          999
        ],
        "next": 0
      },
      ...
  ]
  ```

  **After**:
  ```
  [
    {
      "desc": "wpkh([d4ade89c/84'/1'/0']tpubDDUEYcVXy6Vh5meHvcXN3sAr4k3fWwLZGpAHbkAHL8EnkDxp4d99CjNhJHfM2fUJicANvAKnCZS6XaVAgwAeKYc1KesGCN5qbQ25qQHrRxM/0/*)#8wq8rcft",
      "timestamp": 1613982591,
      "active": true,
      "internal": false,
      "range": [
        0,
        999
      ],
      "next": 0
    },
    ...
  ]
  ```

ACKs for top commit:
  achow101:
    ACK a69c3b3

Tree-SHA512: 4f92e726cb8245aa0b520729cfd272945f0c66830f0555544e0618883aca516318543fa6ab1862058c64b4e4ed54ad1da953e032f4846eef7454122031c1b005

Author: laanwj

src/wallet/rpcdump.cpp

@@ -1971,6 +1971,8 @@ RPCHelpMan listdescriptors()
         throw JSONRPCError(RPC_WALLET_ERROR, "listdescriptors is not available for non-descriptor wallets");
     }
 
+    EnsureWalletIsUnlocked(wallet.get());
+
     LOCK(wallet->cs_wallet);
 
     UniValue response(UniValue::VARR);
@@ -1983,7 +1985,11 @@ RPCHelpMan listdescriptors()
         UniValue spk(UniValue::VOBJ);
         LOCK(desc_spk_man->cs_desc_man);
         const auto& wallet_descriptor = desc_spk_man->GetWalletDescriptor();
-        spk.pushKV("desc", wallet_descriptor.descriptor->ToString());
+        std::string descriptor;
+        if (!desc_spk_man->GetDescriptorString(descriptor, false)) {
+            throw JSONRPCError(RPC_WALLET_ERROR, "Can't get normalized descriptor string.");
+        }
+        spk.pushKV("desc", descriptor);
         spk.pushKV("timestamp", wallet_descriptor.creation_time);
         const bool active = active_spk_mans.count(desc_spk_man) != 0;
         spk.pushKV("active", active);

test/functional/wallet_listdescriptors.py

@@ -51,6 +51,22 @@ def run_test(self):
             assert item['range'] == [0, 0]
             assert item['timestamp'] is not None
 
+        self.log.info('Test descriptors with hardened derivations are listed in importable form.')
+        xprv = 'tprv8ZgxMBicQKsPeuVhWwi6wuMQGfPKi9Li5GtX35jVNknACgqe3CY4g5xgkfDDJcmtF7o1QnxWDRYw4H5P26PXq7sbcUkEqeR4fg3Kxp2tigg'
+        xpub_acc = 'tpubDCMVLhErorrAGfApiJSJzEKwqeaf2z3NrkVMxgYQjZLzMjXMBeRw2muGNYbvaekAE8rUFLftyEar4LdrG2wXyyTJQZ26zptmeTEjPTaATts'
+        hardened_path = '/84\'/1\'/0\''
+        wallet = node.get_wallet_rpc('w2')
+        wallet.importdescriptors([{
+            'desc': descsum_create('pkh(' + xprv + hardened_path + '/0/*)'),
+            'timestamp': 1296688602,
+        }])
+        expected = {'desc': descsum_create('pkh([80002067' + hardened_path + ']' + xpub_acc + '/0/*)'),
+                    'timestamp': 1296688602,
+                    'active': False,
+                    'range': [0, 0],
+                    'next': 0}
+        assert_equal([expected], wallet.listdescriptors())
+
         self.log.info('Test non-active non-range combo descriptor')
         node.createwallet(wallet_name='w4', blank=True, descriptors=True)
         wallet = node.get_wallet_rpc('w4')