wallet: Split signmessage from rpcwallet

Can be reviewed with --color-moved=dimmed-zebra --color-moved-ws=ignore-all-space

4 files changed, 73 insertions, 59 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 9d79ee0e62..6846eb9693 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -409,6 +409,7 @@ libbitcoin_wallet_a_SOURCES = \
   wallet/interfaces.cpp \
   wallet/load.cpp \
   wallet/receive.cpp \
+  wallet/rpc/signmessage.cpp \
   wallet/rpcdump.cpp \
   wallet/rpcwallet.cpp \
   wallet/scriptpubkeyman.cpp \
diff --git a/src/wallet/rpc/signmessage.cpp b/src/wallet/rpc/signmessage.cpp
new file mode 100644
index 0000000000..275eb2f1f7
--- /dev/null
+++ b/src/wallet/rpc/signmessage.cpp
@@ -0,0 +1,68 @@
+// Copyright (c) 2011-2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <key_io.h>
+#include <rpc/util.h>
+#include <util/message.h>
+#include <wallet/rpcwallet.h>
+#include <wallet/wallet.h>
+
+#include <univalue.h>
+
+RPCHelpMan signmessage()
+{
+    return RPCHelpMan{"signmessage",
+        "\nSign a message with the private key of an address" +
+          HELP_REQUIRING_PASSPHRASE,
+        {
+            {"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address to use for the private key."},
+            {"message", RPCArg::Type::STR, RPCArg::Optional::NO, "The message to create a signature of."},
+        },
+        RPCResult{
+            RPCResult::Type::STR, "signature", "The signature of the message encoded in base 64"
+        },
+        RPCExamples{
+            "\nUnlock the wallet for 30 seconds\n"
+            + HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
+            "\nCreate the signature\n"
+            + HelpExampleCli("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"my message\"") +
+            "\nVerify the signature\n"
+            + HelpExampleCli("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"signature\" \"my message\"") +
+            "\nAs a JSON-RPC call\n"
+            + HelpExampleRpc("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", \"my message\"")
+        },
+        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
+        {
+            const std::shared_ptr<const CWallet> pwallet = GetWalletForJSONRPCRequest(request);
+            if (!pwallet) return NullUniValue;
+
+            LOCK(pwallet->cs_wallet);
+
+            EnsureWalletIsUnlocked(*pwallet);
+
+            std::string strAddress = request.params[0].get_str();
+            std::string strMessage = request.params[1].get_str();
+
+            CTxDestination dest = DecodeDestination(strAddress);
+            if (!IsValidDestination(dest)) {
+                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
+            }
+
+            const PKHash* pkhash = std::get_if<PKHash>(&dest);
+            if (!pkhash) {
+                throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
+            }
+
+            std::string signature;
+            SigningResult err = pwallet->SignMessage(strMessage, *pkhash, signature);
+            if (err == SigningResult::SIGNING_FAILED) {
+                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, SigningResultString(err));
+            } else if (err != SigningResult::OK) {
+                throw JSONRPCError(RPC_WALLET_ERROR, SigningResultString(err));
+            }
+
+            return signature;
+        },
+    };
+}
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index c895d5af8c..6bce5d3367 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -20,7 +20,6 @@
 #include <script/sign.h>
 #include <util/bip32.h>
 #include <util/fees.h>
-#include <util/message.h> // For MessageSign()
 #include <util/moneystr.h>
 #include <util/string.h>
 #include <util/system.h>
@@ -48,7 +47,7 @@
 using interfaces::FoundBlock;
 
 static const std::string WALLET_ENDPOINT_BASE = "/wallet/";
-static const std::string HELP_REQUIRING_PASSPHRASE{"\nRequires wallet passphrase to be set with walletpassphrase call if wallet is encrypted.\n"};
+const std::string HELP_REQUIRING_PASSPHRASE{"\nRequires wallet passphrase to be set with walletpassphrase call if wallet is encrypted.\n"};
 
 static inline bool GetAvoidReuseFlag(const CWallet& wallet, const UniValue& param) {
     bool can_avoid_reuse = wallet.IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE);
@@ -612,63 +611,6 @@ static RPCHelpMan listaddressgroupings()
     };
 }
 
-static RPCHelpMan signmessage()
-{
-    return RPCHelpMan{"signmessage",
-                "\nSign a message with the private key of an address" +
-        HELP_REQUIRING_PASSPHRASE,
-                {
-                    {"address", RPCArg::Type::STR, RPCArg::Optional::NO, "The bitcoin address to use for the private key."},
-                    {"message", RPCArg::Type::STR, RPCArg::Optional::NO, "The message to create a signature of."},
-                },
-                RPCResult{
-                    RPCResult::Type::STR, "signature", "The signature of the message encoded in base 64"
-                },
-                RPCExamples{
-            "\nUnlock the wallet for 30 seconds\n"
-            + HelpExampleCli("walletpassphrase", "\"mypassphrase\" 30") +
-            "\nCreate the signature\n"
-            + HelpExampleCli("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"my message\"") +
-            "\nVerify the signature\n"
-            + HelpExampleCli("verifymessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\" \"signature\" \"my message\"") +
-            "\nAs a JSON-RPC call\n"
-            + HelpExampleRpc("signmessage", "\"1D1ZrZNe3JUo7ZycKEYQQiQAWd9y54F4XX\", \"my message\"")
-                },
-        [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
-{
-    const std::shared_ptr<const CWallet> pwallet = GetWalletForJSONRPCRequest(request);
-    if (!pwallet) return NullUniValue;
-
-    LOCK(pwallet->cs_wallet);
-
-    EnsureWalletIsUnlocked(*pwallet);
-
-    std::string strAddress = request.params[0].get_str();
-    std::string strMessage = request.params[1].get_str();
-
-    CTxDestination dest = DecodeDestination(strAddress);
-    if (!IsValidDestination(dest)) {
-        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
-    }
-
-    const PKHash* pkhash = std::get_if<PKHash>(&dest);
-    if (!pkhash) {
-        throw JSONRPCError(RPC_TYPE_ERROR, "Address does not refer to key");
-    }
-
-    std::string signature;
-    SigningResult err = pwallet->SignMessage(strMessage, *pkhash, signature);
-    if (err == SigningResult::SIGNING_FAILED) {
-        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, SigningResultString(err));
-    } else if (err != SigningResult::OK){
-        throw JSONRPCError(RPC_WALLET_ERROR, SigningResultString(err));
-    }
-
-    return signature;
-},
-    };
-}
-
 static CAmount GetReceived(const CWallet& wallet, const UniValue& params, bool by_label) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
 {
     std::set<CTxDestination> address_set;
@@ -4860,6 +4802,7 @@ RPCHelpMan removeprunedfunds();
 RPCHelpMan importmulti();
 RPCHelpMan importdescriptors();
 RPCHelpMan listdescriptors();
+RPCHelpMan signmessage();
 
 Span<const CRPCCommand> GetWalletRPCCommands()
 {
diff --git a/src/wallet/rpcwallet.h b/src/wallet/rpcwallet.h
index 40eb49cf87..fda685e9ee 100644
--- a/src/wallet/rpcwallet.h
+++ b/src/wallet/rpcwallet.h
@@ -21,6 +21,8 @@ class CTransaction;
 struct PartiallySignedTransaction;
 struct WalletContext;
 
+extern const std::string HELP_REQUIRING_PASSPHRASE;
+
 Span<const CRPCCommand> GetWalletRPCCommands();
 
 /**