function validURL(str) {
    var pattern = new RegExp(
        "^(https?:\\/\\/)?" + // protocol
            "((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|" + // domain name
            "((\\d{1,3}\\.){3}\\d{1,3}))" + // OR ip (v4) address
            "(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*" + // port and path
            "(\\?[;&a-z\\d%_.~+=-]*)?" + // query string
            "(\\#[-a-z\\d_]*)?$",
        "i"
    ); // fragment locator
    return !!pattern.test(str);
}

function render_chat_simple_message(response) {
    var x =
        '<div class="message d-flex justify-content-left"><div class="thumbnail"><img src="' +
        response["image"] +
        '" alt=""></div><div class="m"><div class="message-sender msg">';
    if (validURL(response["message"])) {
        x +=
            "<a href='" +
            response["message"] +
            "' target='_blank'>" +
            response["message"].replace(/^.*[\\\/]/, "") +
            "</a>";
    } else {
        x += response["message"];
    }
    x +=
        '</div><div class="time text-left">' +
        response["date"] +
        "</div></div></div>";

    $(".messags").append(x);
    $("#messageInput").val("");
    var objDiv = document.getElementById("chatbox");
    objDiv.scrollTop = objDiv.scrollHeight;
}

function checkFileExt(filename) {
    filename = filename.toLowerCase();
    return filename.split(".").pop();
}