Extract the core of the resolver into a separate class

This makes the core of the resolver independent of the key approval
dialog (and any other UI components).

GnuPG-bug-id: 5283

src/CMakeLists.txt

@@ -142,6 +142,7 @@ ecm_generate_headers(libkleo_CamelCase_HEADERS
   KeyFilterManager
   KeyGroup
   KeyResolver
+  KeyResolverCore
   KleoException
   OidMap
   Predicates

src/kleo/keyresolvercore.h

+/*  -*- c++ -*-
+    kleo/keyresolvercore.h
+
+    This file is part of libkleopatra, the KDE keymanagement library
+    SPDX-FileCopyrightText: 2018 Intevation GmbH
+    SPDX-FileCopyrightText: 2021 g10 Code GmbH
+    SPDX-FileContributor: Ingo Klöcker <dev@ingo-kloecker.de>
+
+    SPDX-License-Identifier: GPL-2.0-or-later
+*/
+
+#ifndef __LIBKLEO_KEYRESOLVERCORE_H__
+#define __LIBKLEO_KEYRESOLVERCORE_H__
+
+#include "kleo_export.h"
+
+#include <QMap>
+
+#include <gpgme++/global.h>
+
+#include <memory>
+#include <vector>
+
+class QString;
+class QStringList;
+
+namespace GpgME
+{
+class Key;
+}
+
+namespace Kleo
+{
+
+class KLEO_EXPORT KeyResolverCore
+{
+public:
+    explicit KeyResolverCore(bool encrypt, bool sign,
+                             GpgME::Protocol format = GpgME::UnknownProtocol);
+    ~KeyResolverCore();
+
+    void setSender(const QString &sender);
+    QString normalizedSender() const;
+
+    void setRecipients(const QStringList &addresses);
+
+    void setSigningKeys(const QStringList &fingerprints);
+
+    void setOverrideKeys(const QMap<GpgME::Protocol, QMap<QString, QStringList> > &overrides);
+
+    void setPreferredProtocol(GpgME::Protocol proto);
+
+    void setMinimumValidity(int validity);
+
+    bool resolve();
+
+    QMap<GpgME::Protocol, std::vector<GpgME::Key> > signingKeys() const;
+
+    QMap<GpgME::Protocol, QMap<QString, std::vector<GpgME::Key> > > encryptionKeys() const;
+
+    QStringList unresolvedRecipients(GpgME::Protocol protocol) const;
+
+private:
+    class Private;
+    std::unique_ptr<Private> d;
+};
+
+} // namespace Kleo
+
+#endif // __LIBKLEO_KEYRESOLVER_H__