refactor: use const LegacyScriptPubKeyMan references in dump{privkey,wallet} RPCs

src/wallet/rpcdump.cpp

@@ -57,7 +57,7 @@ static std::string DecodeDumpString(const std::string &str) {
     return ret.str();
 }
 
-static bool GetWalletAddressesForKey(LegacyScriptPubKeyMan* spk_man, const CWallet& wallet, const CKeyID& keyid, std::string& strAddr, std::string& strLabel) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
+static bool GetWalletAddressesForKey(const LegacyScriptPubKeyMan* spk_man, const CWallet& wallet, const CKeyID& keyid, std::string& strAddr, std::string& strLabel) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
 {
     bool fLabelFound = false;
     CKey key;
@@ -684,7 +684,7 @@ RPCHelpMan dumpprivkey()
     std::shared_ptr<CWallet> const pwallet = GetWalletForJSONRPCRequest(request);
     if (!pwallet) return NullUniValue;
 
-    LegacyScriptPubKeyMan& spk_man = EnsureLegacyScriptPubKeyMan(*pwallet);
+    const LegacyScriptPubKeyMan& spk_man = EnsureConstLegacyScriptPubKeyMan(*pwallet);
 
     LOCK2(pwallet->cs_wallet, spk_man.cs_KeyStore);
 
@@ -735,7 +735,7 @@ RPCHelpMan dumpwallet()
     if (!pwallet) return NullUniValue;
 
     CWallet& wallet = *pwallet;
-    LegacyScriptPubKeyMan& spk_man = EnsureLegacyScriptPubKeyMan(wallet);
+    const LegacyScriptPubKeyMan& spk_man = EnsureConstLegacyScriptPubKeyMan(wallet);
 
     // Make sure the results are valid at least up to the most recent block
     // the user could have gotten from another RPC command prior to now

src/wallet/rpcwallet.cpp

@@ -150,6 +150,15 @@ LegacyScriptPubKeyMan& EnsureLegacyScriptPubKeyMan(CWallet& wallet, bool also_cr
     return *spk_man;
 }
 
+const LegacyScriptPubKeyMan& EnsureConstLegacyScriptPubKeyMan(const CWallet& wallet)
+{
+    const LegacyScriptPubKeyMan* spk_man = wallet.GetLegacyScriptPubKeyMan();
+    if (!spk_man) {
+        throw JSONRPCError(RPC_WALLET_ERROR, "This type of wallet does not support this command");
+    }
+    return *spk_man;
+}
+
 static void WalletTxToJSON(const CWallet& wallet, const CWalletTx& wtx, UniValue& entry)
 {
     interfaces::Chain& chain = wallet.chain();

src/wallet/rpcwallet.h

@@ -34,6 +34,7 @@ std::shared_ptr<CWallet> GetWalletForJSONRPCRequest(const JSONRPCRequest& reques
 void EnsureWalletIsUnlocked(const CWallet&);
 WalletContext& EnsureWalletContext(const std::any& context);
 LegacyScriptPubKeyMan& EnsureLegacyScriptPubKeyMan(CWallet& wallet, bool also_create = false);
+const LegacyScriptPubKeyMan& EnsureConstLegacyScriptPubKeyMan(const CWallet& wallet);
 
 RPCHelpMan getaddressinfo();
 RPCHelpMan signrawtransactionwithwallet();