CLOUD: Add Cloud::Manager and Cloud::Storage

This commit introduces Common::CloudManager, which can be accessed from
OSystem.

The backend for this manager is Cloud::Manager (defined in
backends/cloud/manager.h). It should load all users storages from
configs and provide access to current Storage instance. For now it just
creates a new one.

Cloud::Storage (backends/cloud/storage.h) provides an API to interact
with cloud storage, for example, create new directory or sync files.
Right now it's not ready and has only two dummy methods: listDirectory()
and syncSaves().

There is Cloud::Dropbox::DropboxStorage backend
(backends/cloud/dropbox/dropboxstorage.h) for Cloud::Storage. Right now
it implements both listDirectory() and syncSaves() with starting timer
task and handling it by printing out some JSON examples.

3 files changed, 63 insertions, 8 deletions

diff --git a/common/cloudmanager.h b/common/cloudmanager.h
new file mode 100644
index 0000000000..6b5768280a
--- /dev/null
+++ b/common/cloudmanager.h
@@ -0,0 +1,53 @@
+/* ScummVM - Graphic Adventure Engine
+*
+* ScummVM is the legal property of its developers, whose names
+* are too numerous to list here. Please refer to the COPYRIGHT
+* file distributed with this source distribution.
+*
+* 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 2
+* 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.
+*
+*/
+
+#ifndef COMMON_CLOUDMANAGER_H
+#define COMMON_CLOUDMANAGER_H
+
+#include "backends/cloud/storage.h"
+
+namespace Common {
+
+class CloudManager {
+public:
+	CloudManager() {};
+	virtual ~CloudManager() {};
+
+	/**
+	* Returns active Storage, which could be used to interact
+	*  with cloud storage.
+	*
+	* @return	active Cloud::Storage or null, if there is no active Storage.
+	*/
+
+	virtual Cloud::Storage* getCurrentStorage() = 0;
+
+	/**
+	* Starts saves syncing process in currently active storage if there is any.
+	*/
+
+	virtual void syncSaves() = 0;
+};
+
+} //end of namespace Common
+
+#endif
diff --git a/common/module.mk b/common/module.mk
index 54aa16f557..29def4b8aa 100644
--- a/common/module.mk
+++ b/common/module.mk
@@ -62,5 +62,9 @@ MODULE_OBJS += \
 	updates.o
 endif
 
+#TODO define USE_CLOUD
+#ifdef USE_CLOUD
+#endif
+
 # Include common rules
 include $(srcdir)/rules.mk
diff --git a/common/system.h b/common/system.h
index 1af45fb1fc..b1c74cbc5b 100644
--- a/common/system.h
+++ b/common/system.h
@@ -56,13 +56,11 @@ class HardwareInputSet;
 class Keymap;
 class KeymapperDefaultBindings;
 #endif
-}
-
 //TODO: define USE_CLOUD
-//TODO: probably move to common and name CloudManager
 //#if defined(USE_CLOUD)
-class CloudThread;
+class CloudManager;
 //#endif
+}
 
 class AudioCDManager;
 class FilesystemFactory;
@@ -191,7 +189,7 @@ protected:
 	*
 	* @note _cloudThread is deleted by the OSystem destructor.
 	*/
-	CloudThread *_cloudThread;
+	Common::CloudManager *_cloudThread;
 //#endif
 
 	/**
@@ -1135,12 +1133,12 @@ public:
 //TODO: define USE_CLOUD
 //#if defined(USE_CLOUD)
 	/**
-	* Returns the CloudThread, used to sync save games and
+	* Returns the CloudManager, used to sync save games and
 	* upload/download files from user's cloud storage.
 	*
-	* @return the CloudThread for the current architecture
+	* @return the CloudManager for the current architecture
 	*/
-	virtual CloudThread *getCloudThread() {
+	virtual Common::CloudManager *getCloudManager() {
 		return _cloudThread;
 	}
 //#endif