wallet: rejig to avoid prompting in wallet2

wallet2 is a library, and should not prompt for stdin. Instead,
pass a function so simplewallet can prompt on stdin, and a GUI
might display a window, etc.

3 files changed, 37 insertions, 40 deletions

diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index a7161ffcb..4719447e9 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -135,7 +135,7 @@ uint64_t calculate_fee(uint64_t fee_per_kb, const cryptonote::blobdata &blob, ui
   return calculate_fee(fee_per_kb, blob.size(), fee_multiplier);
 }
 
-std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variables_map& vm, const options& opts)
+std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variables_map& vm, const options& opts, const std::function<boost::optional<tools::password_container>(const char *, bool)> &password_prompter)
 {
   const bool testnet = command_line::get_arg(vm, opts.testnet);
   const bool restricted = command_line::get_arg(vm, opts.restricted);
@@ -154,7 +154,9 @@ std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variabl
   if (command_line::has_arg(vm, opts.daemon_login))
   {
     auto parsed = tools::login::parse(
-      command_line::get_arg(vm, opts.daemon_login), false, "Daemon client password"
+      command_line::get_arg(vm, opts.daemon_login), false, [password_prompter](bool verify) {
+        return password_prompter("Daemon client password", verify);
+      }
     );
     if (!parsed)
       return nullptr;
@@ -178,7 +180,7 @@ std::unique_ptr<tools::wallet2> make_basic(const boost::program_options::variabl
   return wallet;
 }
 
-boost::optional<tools::password_container> get_password(const boost::program_options::variables_map& vm, const options& opts, const bool verify)
+boost::optional<tools::password_container> get_password(const boost::program_options::variables_map& vm, const options& opts, const std::function<boost::optional<tools::password_container>(const char*, bool)> &password_prompter, const bool verify)
 {
   if (command_line::has_arg(vm, opts.password) && command_line::has_arg(vm, opts.password_file))
   {
@@ -207,10 +209,10 @@ boost::optional<tools::password_container> get_password(const boost::program_opt
     return {tools::password_container{std::move(password)}};
   }
 
-  return tools::wallet2::password_prompt(verify);
+  return password_prompter(verify ? tr("Enter new wallet password") : tr("Wallet password"), verify);
 }
 
-std::unique_ptr<tools::wallet2> generate_from_json(const std::string& json_file, const boost::program_options::variables_map& vm, const options& opts)
+std::unique_ptr<tools::wallet2> generate_from_json(const std::string& json_file, const boost::program_options::variables_map& vm, const options& opts, const std::function<boost::optional<tools::password_container>(const char *, bool)> &password_prompter)
 {
   const bool testnet = command_line::get_arg(vm, opts.testnet);
 
@@ -359,7 +361,7 @@ std::unique_ptr<tools::wallet2> generate_from_json(const std::string& json_file,
       return false;
     }
 
-    wallet.reset(make_basic(vm, opts).release());
+    wallet.reset(make_basic(vm, opts, password_prompter).release());
     wallet->set_refresh_from_block_height(field_scan_from_height);
 
     try
@@ -496,34 +498,22 @@ void wallet2::init_options(boost::program_options::options_description& desc_par
   command_line::add_arg(desc_params, opts.restricted);
 }
 
-boost::optional<password_container> wallet2::password_prompt(const bool new_password)
-{
-  auto pwd_container = tools::password_container::prompt(
-    new_password, (new_password ? tr("Enter new wallet password") : tr("Wallet password"))
-  );
-  if (!pwd_container)
-  {
-    tools::fail_msg_writer() << tr("failed to read wallet password");
-  }
-  return pwd_container;
-}
-
-std::unique_ptr<wallet2> wallet2::make_from_json(const boost::program_options::variables_map& vm, const std::string& json_file)
+std::unique_ptr<wallet2> wallet2::make_from_json(const boost::program_options::variables_map& vm, const std::string& json_file, const std::function<boost::optional<tools::password_container>(const char *, bool)> &password_prompter)
 {
   const options opts{};
-  return generate_from_json(json_file, vm, opts);
+  return generate_from_json(json_file, vm, opts, password_prompter);
 }
 
 std::pair<std::unique_ptr<wallet2>, password_container> wallet2::make_from_file(
-  const boost::program_options::variables_map& vm, const std::string& wallet_file)
+  const boost::program_options::variables_map& vm, const std::string& wallet_file, const std::function<boost::optional<tools::password_container>(const char *, bool)> &password_prompter)
 {
   const options opts{};
-  auto pwd = get_password(vm, opts, false);
+  auto pwd = get_password(vm, opts, password_prompter, false);
   if (!pwd)
   {
     return {nullptr, password_container{}};
   }
-  auto wallet = make_basic(vm, opts);
+  auto wallet = make_basic(vm, opts, password_prompter);
   if (wallet)
   {
     wallet->load(wallet_file, pwd->password());
@@ -531,21 +521,21 @@ std::pair<std::unique_ptr<wallet2>, password_container> wallet2::make_from_file(
   return {std::move(wallet), std::move(*pwd)};
 }
 
-std::pair<std::unique_ptr<wallet2>, password_container> wallet2::make_new(const boost::program_options::variables_map& vm)
+std::pair<std::unique_ptr<wallet2>, password_container> wallet2::make_new(const boost::program_options::variables_map& vm, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter)
 {
   const options opts{};
-  auto pwd = get_password(vm, opts, true);
+  auto pwd = get_password(vm, opts, password_prompter, true);
   if (!pwd)
   {
     return {nullptr, password_container{}};
   }
-  return {make_basic(vm, opts), std::move(*pwd)};
+  return {make_basic(vm, opts, password_prompter), std::move(*pwd)};
 }
 
-std::unique_ptr<wallet2> wallet2::make_dummy(const boost::program_options::variables_map& vm)
+std::unique_ptr<wallet2> wallet2::make_dummy(const boost::program_options::variables_map& vm, const std::function<boost::optional<tools::password_container>(const char *, bool)> &password_prompter)
 {
   const options opts{};
-  return make_basic(vm, opts);
+  return make_basic(vm, opts, password_prompter);
 }
 
 //----------------------------------------------------------------------------------------------------
diff --git a/src/wallet/wallet2.h b/src/wallet/wallet2.h
index 8576227e8..b07295253 100644
--- a/src/wallet/wallet2.h
+++ b/src/wallet/wallet2.h
@@ -155,21 +155,18 @@ namespace tools
     static bool has_testnet_option(const boost::program_options::variables_map& vm);
     static void init_options(boost::program_options::options_description& desc_params);
 
-    //! \return Password retrieved from prompt. Logs error on failure.
-    static boost::optional<password_container> password_prompt(const bool new_password);
-
     //! Uses stdin and stdout. Returns a wallet2 if no errors.
-    static std::unique_ptr<wallet2> make_from_json(const boost::program_options::variables_map& vm, const std::string& json_file);
+    static std::unique_ptr<wallet2> make_from_json(const boost::program_options::variables_map& vm, const std::string& json_file, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter);
 
     //! Uses stdin and stdout. Returns a wallet2 and password for `wallet_file` if no errors.
     static std::pair<std::unique_ptr<wallet2>, password_container>
-      make_from_file(const boost::program_options::variables_map& vm, const std::string& wallet_file);
+      make_from_file(const boost::program_options::variables_map& vm, const std::string& wallet_file, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter);
 
     //! Uses stdin and stdout. Returns a wallet2 and password for wallet with no file if no errors.
-    static std::pair<std::unique_ptr<wallet2>, password_container> make_new(const boost::program_options::variables_map& vm);
+    static std::pair<std::unique_ptr<wallet2>, password_container> make_new(const boost::program_options::variables_map& vm, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter);
 
     //! Just parses variables.
-    static std::unique_ptr<wallet2> make_dummy(const boost::program_options::variables_map& vm);
+    static std::unique_ptr<wallet2> make_dummy(const boost::program_options::variables_map& vm, const std::function<boost::optional<password_container>(const char *, bool)> &password_prompter);
 
     static bool verify_password(const std::string& keys_file_name, const std::string& password, bool watch_only);
 
diff --git a/src/wallet/wallet_rpc_server.cpp b/src/wallet/wallet_rpc_server.cpp
index fda8f244a..9dc2baea6 100644
--- a/src/wallet/wallet_rpc_server.cpp
+++ b/src/wallet/wallet_rpc_server.cpp
@@ -60,6 +60,16 @@ namespace
   const command_line::arg_descriptor<std::string> arg_wallet_dir = {"wallet-dir", "Directory for newly created wallets"};
 
   constexpr const char default_rpc_username[] = "monero";
+
+  boost::optional<tools::password_container> password_prompter(const char *prompt, bool verify)
+  {
+    auto pwd_container = tools::password_container::prompt(verify, prompt);
+    if (!pwd_container)
+    {
+      MERROR("failed to read wallet password");
+    }
+    return pwd_container;
+  }
 }
 
 namespace tools
@@ -131,7 +141,7 @@ namespace tools
       walvars = m_wallet;
     else
     {
-      tmpwal = tools::wallet2::make_dummy(*m_vm);
+      tmpwal = tools::wallet2::make_dummy(*m_vm, password_prompter);
       walvars = tmpwal.get();
     }
     boost::optional<epee::net_utils::http::login> http_login{};
@@ -1798,7 +1808,7 @@ namespace tools
       command_line::add_arg(desc, arg_password);
       po::store(po::parse_command_line(argc, argv, desc), vm2);
     }
-    std::unique_ptr<tools::wallet2> wal = tools::wallet2::make_new(vm2).first;
+    std::unique_ptr<tools::wallet2> wal = tools::wallet2::make_new(vm2, password_prompter).first;
     if (!wal)
     {
       er.code = WALLET_RPC_ERROR_CODE_UNKNOWN_ERROR;
@@ -1872,7 +1882,7 @@ namespace tools
     }
     std::unique_ptr<tools::wallet2> wal = nullptr;
     try {
-      wal = tools::wallet2::make_from_file(vm2, wallet_file).first;
+      wal = tools::wallet2::make_from_file(vm2, wallet_file, password_prompter).first;
     }
     catch (const std::exception& e)
     {
@@ -2007,11 +2017,11 @@ int main(int argc, char** argv) {
     LOG_PRINT_L0(tools::wallet_rpc_server::tr("Loading wallet..."));
     if(!wallet_file.empty())
     {
-      wal = tools::wallet2::make_from_file(*vm, wallet_file).first;
+      wal = tools::wallet2::make_from_file(*vm, wallet_file, password_prompter).first;
     }
     else
     {
-      wal = tools::wallet2::make_from_json(*vm, from_json);
+      wal = tools::wallet2::make_from_json(*vm, from_json, password_prompter);
     }
     if (!wal)
     {