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diff --git a/src/auth.h b/src/auth.h
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+/*
+Minetest-c55
+Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.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 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 AUTH_HEADER
+#define AUTH_HEADER
+
+#include <string>
+#include <jthread.h>
+#include <jmutex.h>
+#include "common_irrlicht.h"
+#include "exceptions.h"
+
+// Player privileges. These form a bitmask stored in the privs field
+// of the player, and define things they're allowed to do. See also
+// the static methods Player::privsToString and stringToPrivs that
+// convert these to human-readable form.
+const u64 PRIV_BUILD = 1;            // Can build - i.e. modify the world
+const u64 PRIV_TELEPORT = 2;         // Can teleport
+const u64 PRIV_SETTIME = 4;          // Can set the time
+const u64 PRIV_PRIVS = 8;            // Can grant and revoke privileges
+const u64 PRIV_SERVER = 16;          // Can manage the server (e.g. shutodwn
+                                     // ,settings)
+const u64 PRIV_SHOUT = 32;           // Can broadcast chat messages to all
+                                     // players
+
+// Default privileges - these can be overriden for new players using the
+// config option "default_privs" - however, this value still applies for
+// players that existed before the privileges system was added.
+const u64 PRIV_DEFAULT = PRIV_BUILD|PRIV_SHOUT;
+const u64 PRIV_ALL = 0x7FFFFFFFFFFFFFFFULL;
+const u64 PRIV_INVALID = 0x8000000000000000ULL;
+
+// Convert a privileges value into a human-readable string,
+// with each component separated by a comma.
+std::string privsToString(u64 privs);
+
+// Converts a comma-seperated list of privilege values into a
+// privileges value. The reverse of privsToString(). Returns
+// PRIV_INVALID if there is anything wrong with the input.
+u64 stringToPrivs(std::string str);
+
+struct AuthData
+{
+	std::string pwd;
+	u64 privs;
+
+	AuthData():
+		privs(PRIV_DEFAULT)
+	{
+	}
+};
+
+class AuthNotFoundException : public BaseException
+{
+public:
+	AuthNotFoundException(const char *s):
+		BaseException(s)
+	{}
+};
+
+class AuthManager
+{
+public:
+	AuthManager(const std::string &authfilepath);
+	~AuthManager();
+	void load();
+	void save();
+	bool exists(const std::string &username);
+	void set(const std::string &username, AuthData ad);
+	void add(const std::string &username);
+	std::string getPassword(const std::string &username);
+	void setPassword(const std::string &username,
+			const std::string &password);
+	u64 getPrivs(const std::string &username);
+	void setPrivs(const std::string &username, u64 privs);
+	bool isModified();
+private:
+	JMutex m_mutex;
+	std::string m_authfilepath;
+	core::map<std::string, AuthData> m_authdata;
+	bool m_modified;
+};
+
+#endif
+