1
(async() => {
2
    function set(key, value) {
3
        chrome.storage.local.set({ [key]: value })
4
    };
5
    function get(key) {
6
        return new Promise(resolve => {
7
            chrome.storage.local.get([key], result => {
8
                resolve(result[key])
9
            })
10
        })
11
    };
12
    function validURL(str) {
13
        var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
14
            '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
15
            '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
16
            '(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
17
            '(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
18
            '(\\#[-a-z\\d_]*)?$','i'); // fragment locator
19
        return !!pattern.test(str) || new URL(str).hostname === "localhost";
20
    }
21
    
22
    const checkbox = document.querySelector(".check")
23
    const input = document.querySelector("input")
24

25
    input.value = await get("url") || "";
26
    checkbox.checked = await get("checked") || false;
27

28
    input.onchange = () => {
29
        document.querySelector("p").innerHTML = ""
30
    }
31

32
    checkbox.addEventListener("click", async (event) => {
33
        if (await get("checked")) {
34
            // if already checked, no need to run checks
35
            // set checked to new value, which should be false
36
            set("checked", checkbox.checked);
37
        } else {
38
            // if we're turning on checked, we need to run a few checks
39
            if (validURL(input.value)) {
40
                // if the URL is valid, update url and checked to their latest values.
41
                set("url", input.value);
42
                set("checked", checkbox.checked);
43
            } else {
44
                // if the URL is invalid, scream at them until they burst into tears
45
                document.querySelector("p").innerHTML = "Invalid URL";
46
                checkbox.checked = false;
47
            }
48
        }
49
    })
50
})();
51