Whisper: create base plugin

GitLab: #576
Change-Id: Icae9e8b0653aa7aa7987774cea80d1720673edc0
diff --git a/WhisperTranscript/PluginPreferenceHandler.h b/WhisperTranscript/PluginPreferenceHandler.h
new file mode 100644
index 0000000..a45e12b
--- /dev/null
+++ b/WhisperTranscript/PluginPreferenceHandler.h
@@ -0,0 +1,60 @@
+/**
+ *  Copyright (C) 2021 Savoir-faire Linux Inc.
+ *
+ *  Author: Aline Gondim Santos <aline.gondimsantos@savoirfairelinux.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
+ */
+
+#pragma once
+
+#include "plugin/jamiplugin.h"
+#include "plugin/preferencehandler.h"
+
+#include <string>
+#include <map>
+#include <memory>
+#include <set>
+#include <mutex>
+
+namespace jami {
+class TranscriptMediaHandler;
+
+class PluginPreferenceHandler : public jami::PreferenceHandler
+{
+public:
+    PluginPreferenceHandler(const JAMI_PluginAPI* api,
+                            std::map<std::string, std::map<std::string, std::string>>&& preferences,
+                            const std::string& dataPath);
+    ~PluginPreferenceHandler();
+
+    std::map<std::string, std::string> getHandlerDetails() override;
+    bool preferenceMapHasKey(const std::string& key) override;
+    void setPreferenceAttribute(const std::string& accountId,
+                                const std::string& key,
+                                const std::string& value) override;
+    void resetPreferenceAttributes(const std::string& accountId) override;
+
+    std::map<std::string, std::string> getPreferences(const std::string& accountId);
+    void setTranscriptHandler(TranscriptMediaHandler* handler);
+
+private:
+    const JAMI_PluginAPI* api_;
+    TranscriptMediaHandler* tmh_;
+    const std::string datapath_;
+    std::map<std::string, std::map<std::string, std::string>> preferences_;
+    std::mutex mtx_;
+};
+} // namespace jami