Doggy OS Browser

local function getURL()
    print("Enter URL:")
    return read()
end

local function loadDNSProviderID()
    local filePath = "DNS-Provider.txt"
    if not fs.exists(filePath) then
        print("DNS-Provider.txt not found.")
        return nil
    end
    local file = fs.open(filePath, "r")
    local id = file.readAll()
    file.close()
    return tonumber(id)
end

local function connectToDNS(url, dnsID)
    rednet.open("top")  -- Assuming the modem is on the top
    print("Connecting to DNS...")

    rednet.send(dnsID, url)
    local timer = os.startTimer(5)
    while true do
        local event, p1, p2 = os.pullEvent()
        if event == "rednet_message" and p1 == dnsID then
            rednet.close("top")
            return p2
        elseif event == "timer" and p1 == timer then
            rednet.close("top")
            print("DNS Timeout.")
            return nil
        end
    end
end

local function connectToWebserver(ip)
    rednet.open("top")  -- Assuming the modem is on the top
    print("Connecting to Webserver...")

    rednet.send(tonumber(ip), "GET")
    local timer = os.startTimer(5)
    while true do
        local event, p1, p2 = os.pullEvent()
        if event == "rednet_message" and p1 == tonumber(ip) then
            rednet.close("top")
            return p2
        elseif event == "timer" and p1 == timer then
            rednet.close("top")
            print("Connection timed out.")
            return nil
        end
    end
end

local function runWebsite(code)
    local func, err = load(code, "website", "t", _ENV)
    if func then
        func()
    else
        print("Error loading website: " .. err)
    end
end

-- Main execution
local url = getURL()
local dnsID = loadDNSProviderID()

if not dnsID then
    print("Failed to load DNS Provider ID.")
    return
end

local ip = connectToDNS(url, dnsID)
if ip == "404_NOT_FOUND" then
    print("Error 404: Webpage cannot be found!")
    return
elseif not ip then
    print("Failed to connect to DNS.")
    return
end

local code = connectToWebserver(ip)
if not code then
    print("Failed to connect to Webserver.")
    return
end

-- Write code to file and then delete it
local tempFile = "received_code.lua"
local tempFileHandle = fs.open(tempFile, "w")
tempFileHandle.write(code)
tempFileHandle.close()

-- Immediately delete the file after writing
local success, err = pcall(function() fs.delete(tempFile) end)
if success then
    print("Temporary file deleted successfully.")
else
    print("Error deleting temporary file: " .. err)
end

runWebsite(code)