let IBrowseProxyHostName = "miaproxy.com";

function startsWith(str, word) {
    return str.lastIndexOf(word, 0) === 0;
}

function endsWith(str, word) {
    return str.indexOf(word, str.length - word.length) !== -1;
}

function ReplaceUrl(urlStr) {
    if (!startsWith(urlStr, "http") && !startsWith(urlStr, "//")) {
        return urlStr;
    }

    if (startsWith(urlStr, "//")) {
        urlStr = "https:" + urlStr;
    }

    let url = new URL(urlStr);

    //already proxied? (maybe in html body? cool, just return it)
    if (endsWith(url.hostname, IBrowseProxyHostName)) {
        return urlStr;
    }

    //todo: let's base64encode hostname here?
    // var hostname = url.hostname.split("")
    //     .map(c => c.charCodeAt(0).toString(16).padStart(2, "0"))
    //     .join("");

    var hostname = [...url.hostname].reverse().join("")
    hostname = hostname.replaceAll(".","__")

    url.hostname = hostname + "." + IBrowseProxyHostName;
    return url.toString()
}