From 51d605154037fb1f679b561e90db71163fe8a9f8 Mon Sep 17 00:00:00 2001
From: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>
Date: Sun, 21 Jan 2024 20:46:32 +0100
Subject: [PATCH] `set_join_password` handler

---
 handlers/joinpassword.lua | 63 +++++++++++++++++++++++++++++++++++++++
 init.lua                  |  1 +
 2 files changed, 64 insertions(+)
 create mode 100644 handlers/joinpassword.lua

diff --git a/handlers/joinpassword.lua b/handlers/joinpassword.lua
new file mode 100644
index 0000000..4663b4d
--- /dev/null
+++ b/handlers/joinpassword.lua
@@ -0,0 +1,63 @@
+local function get_store()
+    return minetest.parse_json(mtui.mod_storage:get_string("join_passwords")) or {}
+end
+
+local function set_store(e)
+    mtui.mod_storage:set_string("join_passwords", minetest.write_json(e))
+end
+
+-- sets a temporary join-password (to be set via web, for the wasm client)
+mtui.register_on_command("set_join_password", function(data)
+
+    -- store old password
+    local store = get_store()
+    local auth = minetest.get_auth_handler().get_auth(data.username)
+    if not auth then
+        return false
+    end
+    store[data.username] = {
+        time = os.time(),
+        password = auth.password
+    }
+    set_store(store)
+
+    -- set new join password
+    minetest.log("action", "[mtui] setting join-password for '" .. data.username .."'")
+    minetest.get_auth_handler().set_password(data.username, data.password)
+
+    return true
+end)
+
+
+-- replace previously set join-passwords with original value
+local function restore_join_passwords()
+    local store = get_store()
+    local now = os.time()
+    for playername, entry in pairs(store) do
+        local diff = now - entry.time
+        if diff > 60 then
+            -- restore password and clear entry
+            minetest.log("action", "[mtui] restoring join-password for '" .. playername .."' (timeout)")
+            minetest.get_auth_handler().set_password(playername, entry.password)
+            store[playername] = nil
+        end
+    end
+    set_store(store)
+
+    minetest.after(10, restore_join_passwords)
+end
+minetest.after(10, restore_join_passwords)
+
+-- restore old password on login
+minetest.register_on_joinplayer(function(player)
+    local playername = player:get_player_name()
+
+    local store = get_store()
+    if not store[playername] then
+        return
+    end
+    minetest.log("action", "[mtui] restoring join-password for '" .. playername .."' (successful login)")
+    minetest.get_auth_handler().set_password(playername, store[playername].password)
+    store[playername] = nil
+    set_store(store)
+end)
\ No newline at end of file
diff --git a/init.lua b/init.lua
index 522dfe2..ccf39e8 100644
--- a/init.lua
+++ b/init.lua
@@ -33,6 +33,7 @@ dofile(MP.."/controls/restart_if_empty.lua")
 dofile(MP.."/handlers/ping.lua")
 dofile(MP.."/handlers/items.lua")
 dofile(MP.."/handlers/chat.lua")
+dofile(MP.."/handlers/joinpassword.lua")
 dofile(MP.."/handlers/execute_command.lua")
 dofile(MP.."/handlers/lua.lua")
 dofile(MP.."/handlers/controls.lua")