trezor: support new passphrase entry mechanism

- passphrase can be prompted also when wallet is running (thus added to the wallet listener)
- device/host decision is now made on the host

src/libwalletqt/PassphraseHelper.h

@@ -0,0 +1,74 @@
+// Copyright (c) 2014-2020, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef MONERO_GUI_PASSPHRASEHELPER_H
+#define MONERO_GUI_PASSPHRASEHELPER_H
+
+#include <QtGlobal>
+#include <wallet/api/wallet2_api.h>
+#include <QMutex>
+#include <QPointer>
+#include <QWaitCondition>
+#include <QMutex>
+
+/**
+ * Implements component responsible for showing entry prompt to the user,
+ * typically Wallet / Wallet manager.
+ */
+class PassprasePrompter {
+public:
+    virtual void onWalletPassphraseNeeded(bool onDevice) = 0;
+};
+
+/**
+ * Implements receiver of the passphrase responsible for passing it back to the wallet,
+ * typically wallet listener.
+ */
+class PassphraseReceiver {
+public:
+    virtual void onPassphraseEntered(const QString &passphrase, bool enter_on_device, bool entry_abort) = 0;
+};
+
+class PassphraseHelper {
+public:
+    PassphraseHelper(PassprasePrompter * prompter=nullptr): m_prompter(prompter) {};
+    PassphraseHelper(const PassphraseHelper & h): PassphraseHelper(h.m_prompter) {};
+    Monero::optional<std::string> onDevicePassphraseRequest(bool & on_device);
+    void onPassphraseEntered(const QString &passphrase, bool enter_on_device, bool entry_abort);
+
+private:
+    PassprasePrompter * m_prompter;
+    QWaitCondition m_cond_pass;
+    QMutex m_mutex_pass;
+    QString m_passphrase;
+    bool m_passphrase_abort;
+    bool m_passphrase_on_device;
+
+};
+
+#endif //MONERO_GUI_PASSPHRASEHELPER_H