Get windows system proxy（only support http proxy） and auto set proxy for mpv and ytdl_hook

set_proxy.lua

local mp = require 'mp'
local block = true

function string:trim()
    return (self:gsub("^%s*(.-)%s*$", "%1"))
end

-- safe protocol (copied from mpv ytdl_hook.lua)
------------------------------------------------------------------------
local function Set (t)
    local set = {}
    for _, v in pairs(t) do set[v] = true end
    return set
end

local safe_protos = Set {
    "http", "https", "ftp", "ftps",
    "rtmp", "rtmps", "rtmpe", "rtmpt", "rtmpts", "rtmpte",
    "data"
}
------------------------------------------------------------------------
local function is_safe_protocol(path)
    local proto = type(path) == "string" and path:match("^(%a[%w+.-]*):") or nil
    return proto and safe_protos[proto]
end


local function pwshexec(command)
    local ret = mp.command_native({
        name = "subprocess",
        args = {"powershell", "-NoProfile", "-Command", command},
        playback_only = false,
        capture_stdout = true,
        capture_stderr = true
    })
    
    if ret.killed_by_us or (ret.status ~= 0) or ret.stdout == "" then
        return ""
    else
        return (ret.stdout:gsub("\r\n$", "")):trim()
    end
end

local function get_proxy()
    -- 合并两次PowerShell调用为一次，减少进程创建开销
    local result = pwshexec([[
        $settings = Get-ItemProperty -Path 'Registry::HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings'
        if ($settings.ProxyEnable -eq 1) {
            $proxy = $settings.ProxyServer
            if ($proxy -match '(\w+\.?)*:\d+') {
                $matches[0]
            }
        }
    ]])
    
    if result ~= "" then
        return "http://" .. result
    end
    return nil
end

mp.command_native_async({name='ignore'},function()
	-- 获取代理信息
	local proxy = get_proxy()
	--mp.msg.debug(proxy)
	if proxy then
		-- 设置http-proxy
		if mp.get_property("http-proxy") == "" then
			mp.set_property("http-proxy", proxy)
			mp.msg.info("Auto set http-proxy: " .. proxy)
		end

		-- 设置youtube-dl代理
		local raw_options = mp.get_property_native("options/ytdl-raw-options")
		if not raw_options["proxy"] or raw_options["proxy"] == "" then
		   mp.commandv('no-osd', 'change-list', 'ytdl-raw-options', 'append', 'proxy='..proxy)
		end
	end

    block = false
end)

-- 在ytdl_hook.lua运行前等待代理设置完成
mp.add_hook("on_load", 9, function()
    local url = mp.get_property("stream-open-filename", "")
    if is_safe_protocol(url) then
        while block do
        end
    end
    if not block then
        exit()
    end
end)

这个怎么用，放到哪个文件夹里