Replace auth.txt with SQLite auth database (#7279)

* Replace auth.txt with SQLite auth database

3 files changed, 271 insertions, 0 deletions

diff --git a/src/script/lua_api/CMakeLists.txt b/src/script/lua_api/CMakeLists.txt
index 97c3786ec..32f6a2793 100644
--- a/src/script/lua_api/CMakeLists.txt
+++ b/src/script/lua_api/CMakeLists.txt
@@ -1,5 +1,6 @@
 set(common_SCRIPT_LUA_API_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/l_areastore.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/l_auth.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_base.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_craft.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/l_env.cpp
diff --git a/src/script/lua_api/l_auth.cpp b/src/script/lua_api/l_auth.cpp
new file mode 100644
index 000000000..0fc57ba3a
--- /dev/null
+++ b/src/script/lua_api/l_auth.cpp
@@ -0,0 +1,216 @@
+/*
+Minetest
+Copyright (C) 2018 bendeutsch, Ben Deutsch <ben@bendeutsch.de>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#include "lua_api/l_auth.h"
+#include "lua_api/l_internal.h"
+#include "common/c_converter.h"
+#include "common/c_content.h"
+#include "cpp_api/s_base.h"
+#include "server.h"
+#include "environment.h"
+#include "database/database.h"
+#include <algorithm>
+
+// common start: ensure auth db
+AuthDatabase *ModApiAuth::getAuthDb(lua_State *L)
+{
+	ServerEnvironment *server_environment =
+			dynamic_cast<ServerEnvironment *>(getEnv(L));
+	if (!server_environment)
+		return nullptr;
+	return server_environment->getAuthDatabase();
+}
+
+void ModApiAuth::pushAuthEntry(lua_State *L, const AuthEntry &authEntry)
+{
+	lua_newtable(L);
+	int table = lua_gettop(L);
+	// id
+	lua_pushnumber(L, authEntry.id);
+	lua_setfield(L, table, "id");
+	// name
+	lua_pushstring(L, authEntry.name.c_str());
+	lua_setfield(L, table, "name");
+	// password
+	lua_pushstring(L, authEntry.password.c_str());
+	lua_setfield(L, table, "password");
+	// privileges
+	lua_newtable(L);
+	int privtable = lua_gettop(L);
+	for (const std::string &privs : authEntry.privileges) {
+		lua_pushboolean(L, true);
+		lua_setfield(L, privtable, privs.c_str());
+	}
+	lua_setfield(L, table, "privileges");
+	// last_login
+	lua_pushnumber(L, authEntry.last_login);
+	lua_setfield(L, table, "last_login");
+
+	lua_pushvalue(L, table);
+}
+
+// auth_read(name)
+int ModApiAuth::l_auth_read(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	AuthDatabase *auth_db = getAuthDb(L);
+	if (!auth_db)
+		return 0;
+	AuthEntry authEntry;
+	const char *name = luaL_checkstring(L, 1);
+	bool success = auth_db->getAuth(std::string(name), authEntry);
+	if (!success)
+		return 0;
+
+	pushAuthEntry(L, authEntry);
+	return 1;
+}
+
+// auth_save(table)
+int ModApiAuth::l_auth_save(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	AuthDatabase *auth_db = getAuthDb(L);
+	if (!auth_db)
+		return 0;
+	luaL_checktype(L, 1, LUA_TTABLE);
+	int table = 1;
+	AuthEntry authEntry;
+	bool success;
+	success = getintfield(L, table, "id", authEntry.id);
+	success = success && getstringfield(L, table, "name", authEntry.name);
+	success = success && getstringfield(L, table, "password", authEntry.password);
+	lua_getfield(L, table, "privileges");
+	if (lua_istable(L, -1)) {
+		lua_pushnil(L);
+		while (lua_next(L, -2)) {
+			authEntry.privileges.emplace_back(
+					lua_tostring(L, -2)); // the key, not the value
+			lua_pop(L, 1);
+		}
+	} else {
+		success = false;
+	}
+	lua_pop(L, 1); // the table
+	success = success && getintfield(L, table, "last_login", authEntry.last_login);
+
+	if (!success) {
+		lua_pushboolean(L, false);
+		return 1;
+	}
+
+	lua_pushboolean(L, auth_db->saveAuth(authEntry));
+	return 1;
+}
+
+// auth_create(table)
+int ModApiAuth::l_auth_create(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	AuthDatabase *auth_db = getAuthDb(L);
+	if (!auth_db)
+		return 0;
+	luaL_checktype(L, 1, LUA_TTABLE);
+	int table = 1;
+	AuthEntry authEntry;
+	bool success;
+	// no meaningful id field, we assume
+	success = getstringfield(L, table, "name", authEntry.name);
+	success = success && getstringfield(L, table, "password", authEntry.password);
+	lua_getfield(L, table, "privileges");
+	if (lua_istable(L, -1)) {
+		lua_pushnil(L);
+		while (lua_next(L, -2)) {
+			authEntry.privileges.emplace_back(
+					lua_tostring(L, -2)); // the key, not the value
+			lua_pop(L, 1);
+		}
+	} else {
+		success = false;
+	}
+	lua_pop(L, 1); // the table
+	success = success && getintfield(L, table, "last_login", authEntry.last_login);
+
+	if (!success)
+		return 0;
+
+	if (auth_db->createAuth(authEntry)) {
+		pushAuthEntry(L, authEntry);
+		return 1;
+	}
+
+	return 0;
+}
+
+// auth_delete(name)
+int ModApiAuth::l_auth_delete(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	AuthDatabase *auth_db = getAuthDb(L);
+	if (!auth_db)
+		return 0;
+	std::string name(luaL_checkstring(L, 1));
+	lua_pushboolean(L, auth_db->deleteAuth(name));
+	return 1;
+}
+
+// auth_list_names()
+int ModApiAuth::l_auth_list_names(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	AuthDatabase *auth_db = getAuthDb(L);
+	if (!auth_db)
+		return 0;
+	std::vector<std::string> names;
+	auth_db->listNames(names);
+	lua_createtable(L, names.size(), 0);
+	int table = lua_gettop(L);
+	int i = 1;
+	for (const std::string &name : names) {
+		lua_pushstring(L, name.c_str());
+		lua_rawseti(L, table, i++);
+	}
+	return 1;
+}
+
+// auth_reload()
+int ModApiAuth::l_auth_reload(lua_State *L)
+{
+	NO_MAP_LOCK_REQUIRED;
+	AuthDatabase *auth_db = getAuthDb(L);
+	if (auth_db)
+		auth_db->reload();
+	return 0;
+}
+
+void ModApiAuth::Initialize(lua_State *L, int top)
+{
+
+	lua_newtable(L);
+	int auth_top = lua_gettop(L);
+
+	registerFunction(L, "read", l_auth_read, auth_top);
+	registerFunction(L, "save", l_auth_save, auth_top);
+	registerFunction(L, "create", l_auth_create, auth_top);
+	registerFunction(L, "delete", l_auth_delete, auth_top);
+	registerFunction(L, "list_names", l_auth_list_names, auth_top);
+	registerFunction(L, "reload", l_auth_reload, auth_top);
+
+	lua_setfield(L, top, "auth");
+}
diff --git a/src/script/lua_api/l_auth.h b/src/script/lua_api/l_auth.h
new file mode 100644
index 000000000..fb9a9875b
--- /dev/null
+++ b/src/script/lua_api/l_auth.h
@@ -0,0 +1,54 @@
+/*
+Minetest
+Copyright (C) 2018 bendeutsch, Ben Deutsch <ben@bendeutsch.de>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser 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 "lua_api/l_base.h"
+
+class AuthDatabase;
+struct AuthEntry;
+
+class ModApiAuth : public ModApiBase
+{
+private:
+	// auth_read(name)
+	static int l_auth_read(lua_State *L);
+
+	// auth_save(table)
+	static int l_auth_save(lua_State *L);
+
+	// auth_create(table)
+	static int l_auth_create(lua_State *L);
+
+	// auth_delete(name)
+	static int l_auth_delete(lua_State *L);
+
+	// auth_list_names()
+	static int l_auth_list_names(lua_State *L);
+
+	// auth_reload()
+	static int l_auth_reload(lua_State *L);
+
+	// helper for auth* methods
+	static AuthDatabase *getAuthDb(lua_State *L);
+	static void pushAuthEntry(lua_State *L, const AuthEntry &authEntry);
+
+public:
+	static void Initialize(lua_State *L, int top);
+};