IronPython disable Import after use

Question

Is there any way to disable the use of import once I've finished using it? I'm using IronPython as a scripting engine and I don't want users to be able to import anything. This could be done in LuaInterface by the use of setfenv:

luanet.load_assembly("System.Windows.Forms")
luanet.load_assembly("System.Drawing")

Form=luanet.import_type("System.Windows.Forms.Form")

-- Only allow the use of the form class

local env = { Form = _G.Form }

setfenv(1, env)

Or by setting the import functions to nil before parsing the script file:

luanet.load_assembly = nil
luanet.import_type = nil

Is this possible in IronPython?

Answer 1

One option is to pre-check the scripts you are executing and disallow any that have import statements (or from ... import statements).

foreach(line in script) {
    if(line.TrimeStart().StartsWith("import") || line.TrimeStart().StartsWith("from") {
        throw ...;
    }
}

It's not foolproof (__import__ is still an issue), but it will cover the vast majority of cases.