[tools] Add wallet inspection and modification tool

This commit adds wallet-tool, a tool for creating and interacting with
wallet files. Original implementation was by Jonas Schnelli
<dev@jonasschnelli.ch> with modifications by John Newbery
<john@johnnewbery.com>

MSVC files were provided by Chun Kuan Lee <ken2812221@gmail.com>:

build: Add MSVC project files for bitcoin-wallet-tool

1 files changed, 121 insertions, 0 deletions

diff --git a/src/bitcoin-wallet.cpp b/src/bitcoin-wallet.cpp
new file mode 100644
index 0000000000..293e3efa5c
--- /dev/null
+++ b/src/bitcoin-wallet.cpp
@@ -0,0 +1,121 @@
+// Copyright (c) 2016-2018 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
+#include <chainparams.h>
+#include <chainparamsbase.h>
+#include <consensus/consensus.h>
+#include <logging.h>
+#include <util/system.h>
+#include <util/strencodings.h>
+#include <wallet/wallettool.h>
+
+#include <stdio.h>
+
+const std::function<std::string(const char*)> G_TRANSLATION_FUN = nullptr;
+
+static void SetupWalletToolArgs()
+{
+    SetupChainParamsBaseOptions();
+
+    gArgs.AddArg("-?", "This help message", false, OptionsCategory::OPTIONS);
+    gArgs.AddArg("-datadir=<dir>", "Specify data directory", false, OptionsCategory::OPTIONS);
+    gArgs.AddArg("-wallet=<wallet-name>", "Specify wallet name", false, OptionsCategory::OPTIONS);
+    gArgs.AddArg("-debug=<category>", "Output debugging information (default: 0).", false, OptionsCategory::DEBUG_TEST);
+    gArgs.AddArg("-printtoconsole", "Send trace/debug info to console (default: 1 when no -debug is true, 0 otherwise.", false, OptionsCategory::DEBUG_TEST);
+
+    gArgs.AddArg("info", "Get wallet info", false, OptionsCategory::COMMANDS);
+    gArgs.AddArg("create", "Create new wallet file", false, OptionsCategory::COMMANDS);
+
+    // Hidden
+    gArgs.AddArg("-h", "", false, OptionsCategory::HIDDEN);
+    gArgs.AddArg("-help", "", false, OptionsCategory::HIDDEN);
+}
+
+static bool WalletAppInit(int argc, char* argv[])
+{
+    SetupWalletToolArgs();
+    std::string error_message;
+    if (!gArgs.ParseParameters(argc, argv, error_message)) {
+        fprintf(stderr, "Error parsing command line arguments: %s\n", error_message.c_str());
+        return false;
+    }
+    if (argc < 2 || HelpRequested(gArgs)) {
+        std::string usage = strprintf("%s bitcoin-wallet version", PACKAGE_NAME) + " " + FormatFullVersion() + "\n\n" +
+                                      "wallet-tool is an offline tool for creating and interacting with Bitcoin Core wallet files.\n" +
+                                      "By default wallet-tool will act on wallets in the default mainnet wallet directory in the datadir.\n" +
+                                      "To change the target wallet, use the -datadir, -wallet and -testnet/-regtest arguments.\n\n" +
+                                      "Usage:\n" +
+                                     "  bitcoin-wallet [options] <command>\n\n" +
+                                     gArgs.GetHelpMessage();
+
+        fprintf(stdout, "%s", usage.c_str());
+        return false;
+    }
+
+    // check for printtoconsole, allow -debug
+    g_logger->m_print_to_console = gArgs.GetBoolArg("-printtoconsole", gArgs.GetBoolArg("-debug", false));
+
+    if (!fs::is_directory(GetDataDir(false))) {
+        fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", gArgs.GetArg("-datadir", "").c_str());
+        return false;
+    }
+    // Check for -testnet or -regtest parameter (Params() calls are only valid after this clause)
+    SelectParams(gArgs.GetChainName());
+
+    return true;
+}
+
+int main(int argc, char* argv[])
+{
+#ifdef WIN32
+    util::WinCmdLineArgs winArgs;
+    std::tie(argc, argv) = winArgs.get();
+#endif
+    SetupEnvironment();
+    RandomInit();
+    try {
+        if (!WalletAppInit(argc, argv)) return EXIT_FAILURE;
+    } catch (const std::exception& e) {
+        PrintExceptionContinue(&e, "WalletAppInit()");
+        return EXIT_FAILURE;
+    } catch (...) {
+        PrintExceptionContinue(nullptr, "WalletAppInit()");
+        return EXIT_FAILURE;
+    }
+
+    std::string method {};
+    for(int i = 1; i < argc; ++i) {
+        if (!IsSwitchChar(argv[i][0])) {
+            if (!method.empty()) {
+                fprintf(stderr, "Error: two methods provided (%s and %s). Only one method should be provided.\n", method.c_str(), argv[i]);
+                return EXIT_FAILURE;
+            }
+            method = argv[i];
+        }
+    }
+
+    if (method.empty()) {
+        fprintf(stderr, "No method provided. Run `bitcoin-wallet -help` for valid methods.\n");
+        return EXIT_FAILURE;
+    }
+
+    // A name must be provided when creating a file
+    if (method == "create" && !gArgs.IsArgSet("-wallet")) {
+        fprintf(stderr, "Wallet name must be provided when creating a new wallet.\n");
+        return EXIT_FAILURE;
+    }
+
+    std::string name = gArgs.GetArg("-wallet", "");
+
+    ECCVerifyHandle globalVerifyHandle;
+    ECC_Start();
+    if (!WalletTool::ExecuteWalletToolFunc(method, name))
+        return EXIT_FAILURE;
+    ECC_Stop();
+    return EXIT_SUCCESS;
+}