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Support for protection mods has recently been added to the Minetest API.
You can see an example of how protection mods should use this here.

Any mods that want to check if a position is protected should use minetest.is_protected(pos, playername). This is an improvement over having to use hacks like this.

This also allows you to do special things on protection violations, for example damaging or banning the player.

Protection mods that do not update will still work, mostly. Any mod that checks protection at a position will believe that the position is unprotected, whether or not it is.

You can get more details in lua_api.txt.

This is truly wonderful news.

This is quite a vague topic.

• Is it in cpp api, built in, or minetest_game?
• Will protection mods automatically support it, or do they need to be updated?
• Link to lua_api
• [0.4.8]?

That's not really a hack.

It appears to be in builtin/*.lua.

rubenwardy wrote:This is quite a vague topic.

• Is it in cpp api, built in, or minetest_game?
• Will protection mods automatically support it, or do they need to be updated?
• Link to lua_api
• [0.4.8]?

That's not really a hack.

To answer the questions:

• It is implemented in Lua.
• No, protection mods do not support it automatically. This simply provides a basic, standardized framework for the protection mods to build on top of
• https://github.com/minetest/minetest/blob/master/doc/lua_api.txt#L1493
• Yes. In fact, you will have it even if you check out the code now and make a build!