[CSM] Add function to get player privileges (#5933)

* [CSM] Add function to get player privileges + move related help functions to common

* Added @Zeno- const

7 files changed, 56 insertions, 25 deletions

diff --git a/builtin/common/misc_helpers.lua b/builtin/common/misc_helpers.lua
index 68481f7c8..d162bc0a2 100644
--- a/builtin/common/misc_helpers.lua
+++ b/builtin/common/misc_helpers.lua
@@ -723,3 +723,28 @@ function core.pointed_thing_to_face_pos(placer, pointed_thing)
 	end
 	return fine_pos
 end
+
+function core.string_to_privs(str, delim)
+	assert(type(str) == "string")
+	delim = delim or ','
+	local privs = {}
+	for _, priv in pairs(string.split(str, delim)) do
+		privs[priv:trim()] = true
+	end
+	return privs
+end
+
+function core.privs_to_string(privs, delim)
+	assert(type(privs) == "table")
+	delim = delim or ','
+	local list = {}
+	for priv, bool in pairs(privs) do
+		if bool then
+			list[#list + 1] = priv
+		end
+	end
+	return table.concat(list, delim)
+end
+
+assert(core.string_to_privs("a,b").b == true)
+assert(core.privs_to_string({a=true,b=true}) == "a,b")
diff --git a/builtin/game/auth.lua b/builtin/game/auth.lua
index 8cb4ebf57..7a6be8788 100644
--- a/builtin/game/auth.lua
+++ b/builtin/game/auth.lua
@@ -4,31 +4,6 @@
 -- Authentication handler
 --
 
-function core.string_to_privs(str, delim)
-	assert(type(str) == "string")
-	delim = delim or ','
-	local privs = {}
-	for _, priv in pairs(string.split(str, delim)) do
-		privs[priv:trim()] = true
-	end
-	return privs
-end
-
-function core.privs_to_string(privs, delim)
-	assert(type(privs) == "table")
-	delim = delim or ','
-	local list = {}
-	for priv, bool in pairs(privs) do
-		if bool then
-			list[#list + 1] = priv
-		end
-	end
-	return table.concat(list, delim)
-end
-
-assert(core.string_to_privs("a,b").b == true)
-assert(core.privs_to_string({a=true,b=true}) == "a,b")
-
 core.auth_file_path = core.get_worldpath().."/auth.txt"
 core.auth_table = {}
 
diff --git a/clientmods/preview/init.lua b/clientmods/preview/init.lua
index f3992612a..073ea11db 100644
--- a/clientmods/preview/init.lua
+++ b/clientmods/preview/init.lua
@@ -150,3 +150,9 @@ core.register_on_punchnode(function(pos, node)
 	return false
 end)
 
+core.register_chatcommand("privs", {
+	func = function(param)
+		return true, core.privs_to_string(minetest.get_privilege_list())
+	end,
+})
+
diff --git a/doc/client_lua_api.md b/doc/client_lua_api.md
index 1375e1355..42d2bfbbf 100644
--- a/doc/client_lua_api.md
+++ b/doc/client_lua_api.md
@@ -730,6 +730,13 @@ Call these functions only at load time!
 * `minetest.localplayer`
     * Reference to the LocalPlayer object. See [`LocalPlayer`](#localplayer) class reference for methods.
 
+### Privileges
+* `minetest.get_privilege_list()`
+    * Returns a list of privileges the currect player has in the format `{priv1=true,...}`
+* `minetest.string_to_privs(str)`: returns `{priv1=true,...}`
+* `minetest.privs_to_string(privs)`: returns `"priv1,priv2,..."`
+    * Convert between two privilege representations
+
 ### Client Environment
 * `minetest.get_player_names()`
     * Returns list of player names on server
diff --git a/src/client.h b/src/client.h
index 149fdfe57..9aec0d061 100644
--- a/src/client.h
+++ b/src/client.h
@@ -416,6 +416,9 @@ public:
 	bool checkPrivilege(const std::string &priv) const
 	{ return (m_privileges.count(priv) != 0); }
 
+	const std::unordered_set<std::string> &getPrivilegeList() const
+	{ return m_privileges; }
+
 	bool getChatMessage(std::wstring &message);
 	void typeChatMessage(const std::wstring& message);
 
diff --git a/src/script/lua_api/l_client.cpp b/src/script/lua_api/l_client.cpp
index 3c2955bcd..eab7bdfae 100644
--- a/src/script/lua_api/l_client.cpp
+++ b/src/script/lua_api/l_client.cpp
@@ -329,6 +329,16 @@ int ModApiClient::l_take_screenshot(lua_State *L)
 	return 0;
 }
 
+int ModApiClient::l_get_privilege_list(lua_State *L)
+{
+	const Client *client = getClient(L);
+	lua_newtable(L);
+	for (const std::string &priv : client->getPrivilegeList()) {
+		lua_pushboolean(L, true);
+		lua_setfield(L, -2, priv.c_str());
+	}
+	return 1;
+}
 void ModApiClient::Initialize(lua_State *L, int top)
 {
 	API_FCT(get_current_modname);
@@ -353,4 +363,5 @@ void ModApiClient::Initialize(lua_State *L, int top)
 	API_FCT(get_item_def);
 	API_FCT(get_node_def);
 	API_FCT(take_screenshot);
+	API_FCT(get_privilege_list);
 }
diff --git a/src/script/lua_api/l_client.h b/src/script/lua_api/l_client.h
index fe5780fb1..2f0c2e3f8 100644
--- a/src/script/lua_api/l_client.h
+++ b/src/script/lua_api/l_client.h
@@ -89,8 +89,12 @@ private:
 	// get_node_def(nodename)
 	static int l_get_node_def(lua_State *L);
 
+	// take_screenshot()
 	static int l_take_screenshot(lua_State *L);
 
+	// get_privilege_list()
+	static int l_get_privilege_list(lua_State *L);
+
 public:
 	static void Initialize(lua_State *L, int top);
 };