From 914dbeaa0be4b5ef87506b605ef4e241cd3732dc Mon Sep 17 00:00:00 2001
From: luk3yx <luk3yx@users.noreply.github.com>
Date: Thu, 23 Apr 2020 23:07:19 +1200
Subject: [PATCH] Add LevelDB auth database. (#9476)

* Add leveldb auth database.
---
 src/database/database-leveldb.cpp | 98 ++++++++++++++++++++++++++++++-
 src/database/database-leveldb.h   | 17 ++++++
 src/serverenvironment.cpp         |  8 +++
 3 files changed, 122 insertions(+), 1 deletion(-)

diff --git a/src/database/database-leveldb.cpp b/src/database/database-leveldb.cpp
index 4a4904c6a..1aab4c43d 100644
--- a/src/database/database-leveldb.cpp
+++ b/src/database/database-leveldb.cpp
@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "log.h"
 #include "filesys.h"
 #include "exceptions.h"
+#include "util/serialize.h"
 #include "util/string.h"
 
 #include "leveldb/db.h"
@@ -97,5 +98,100 @@ void Database_LevelDB::listAllLoadableBlocks(std::vector<v3s16> &dst)
 	delete it;
 }
 
-#endif // USE_LEVELDB
+AuthDatabaseLevelDB::AuthDatabaseLevelDB(const std::string &savedir)
+{
+	leveldb::Options options;
+	options.create_if_missing = true;
+	leveldb::Status status = leveldb::DB::Open(options,
+		savedir + DIR_DELIM + "auth.db", &m_database);
+	ENSURE_STATUS_OK(status);
+}
 
+AuthDatabaseLevelDB::~AuthDatabaseLevelDB()
+{
+	delete m_database;
+}
+
+bool AuthDatabaseLevelDB::getAuth(const std::string &name, AuthEntry &res)
+{
+	std::string raw;
+	leveldb::Status s = m_database->Get(leveldb::ReadOptions(), name, &raw);
+	if (!s.ok())
+		return false;
+	std::istringstream is(raw);
+
+	/*
+	u8 version = 1
+	std::string password
+	u16 number of privileges
+	for each privilege {
+		std::string privilege
+	}
+	s64 last_login
+	*/
+
+	if (readU8(is) > 1)
+		return false;
+
+	res.id = 1;
+	res.name = name;
+	res.password = deSerializeString(is);
+
+	u16 privilege_count = readU16(is);
+	res.privileges.clear();
+	res.privileges.reserve(privilege_count);
+	for (u16 i = 0; i < privilege_count; i++) {
+		res.privileges.push_back(deSerializeString(is));
+	}
+
+	res.last_login = readS64(is);
+	return true;
+}
+
+bool AuthDatabaseLevelDB::saveAuth(const AuthEntry &authEntry)
+{
+	std::ostringstream os;
+	writeU8(os, 1);
+	os << serializeString(authEntry.password);
+
+	size_t privilege_count = authEntry.privileges.size();
+	FATAL_ERROR_IF(privilege_count > U16_MAX,
+		"Unsupported number of privileges");
+	writeU16(os, privilege_count);
+	for (const std::string &privilege : authEntry.privileges) {
+		os << serializeString(privilege);
+	}
+
+	writeS64(os, authEntry.last_login);
+	leveldb::Status s = m_database->Put(leveldb::WriteOptions(),
+		authEntry.name, os.str());
+	return s.ok();
+}
+
+bool AuthDatabaseLevelDB::createAuth(AuthEntry &authEntry)
+{
+	return saveAuth(authEntry);
+}
+
+bool AuthDatabaseLevelDB::deleteAuth(const std::string &name)
+{
+	leveldb::Status s = m_database->Delete(leveldb::WriteOptions(), name);
+	return s.ok();
+}
+
+void AuthDatabaseLevelDB::listNames(std::vector<std::string> &res)
+{
+	leveldb::Iterator* it = m_database->NewIterator(leveldb::ReadOptions());
+	res.clear();
+	for (it->SeekToFirst(); it->Valid(); it->Next()) {
+		res.emplace_back(it->key().ToString());
+	}
+	delete it;
+}
+
+void AuthDatabaseLevelDB::reload()
+{
+	// No-op for LevelDB.
+}
+
+#endif // USE_LEVELDB
diff --git a/src/database/database-leveldb.h b/src/database/database-leveldb.h
index d30f9f8f5..a9bd0faa4 100644
--- a/src/database/database-leveldb.h
+++ b/src/database/database-leveldb.h
@@ -45,4 +45,21 @@ private:
 	leveldb::DB *m_database;
 };
 
+class AuthDatabaseLevelDB : public AuthDatabase
+{
+public:
+	AuthDatabaseLevelDB(const std::string &savedir);
+	virtual ~AuthDatabaseLevelDB();
+
+	virtual bool getAuth(const std::string &name, AuthEntry &res);
+	virtual bool saveAuth(const AuthEntry &authEntry);
+	virtual bool createAuth(AuthEntry &authEntry);
+	virtual bool deleteAuth(const std::string &name);
+	virtual void listNames(std::vector<std::string> &res);
+	virtual void reload();
+
+private:
+	leveldb::DB *m_database;
+};
+
 #endif // USE_LEVELDB
diff --git a/src/serverenvironment.cpp b/src/serverenvironment.cpp
index 27f0c1e3d..08d796118 100644
--- a/src/serverenvironment.cpp
+++ b/src/serverenvironment.cpp
@@ -44,6 +44,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #if USE_POSTGRESQL
 #include "database/database-postgresql.h"
 #endif
+#if USE_LEVELDB
+#include "database/database-leveldb.h"
+#endif
 #include "server/luaentity_sao.h"
 #include "server/player_sao.h"
 
@@ -2187,6 +2190,11 @@ AuthDatabase *ServerEnvironment::openAuthDatabase(
 	if (name == "files")
 		return new AuthDatabaseFiles(savedir);
 
+#if USE_LEVELDB
+	if (name == "leveldb")
+		return new AuthDatabaseLevelDB(savedir);
+#endif
+
 	throw BaseException(std::string("Database backend ") + name + " not supported.");
 }