cobalt/src/front/cobalt.js

let isIOS = navigator.userAgent.toLowerCase().match("iphone os");
let switchers = {
    "theme": ["auto", "light", "dark"],
    "youtubeFormat": ["mp4", "webm", "audio"],
    "quality": ["max", "hig", "mid", "low"]
}

function eid(id) {
    return document.getElementById(id)
}
function enable(id) {
    eid(id).dataset.enabled = "true";
}
function disable(id) {
    eid(id).dataset.enabled = "false";
}
function vis(state) {
    return (state === 1) ? "visible" : "hidden";
}
function changeDownloadButton(action, text) {
    switch (action) {
        case 0:
            eid("download-button").disabled = true
            if (localStorage.getItem("alwaysVisibleButton") == "true") {
                eid("download-button").value = text
                eid("download-button").style.padding = '0 1rem'
            } else {
                eid("download-button").value = ''
                eid("download-button").style.padding = '0'
            }
            break;
        case 1:
            eid("download-button").disabled = false
            eid("download-button").value = text
            eid("download-button").style.padding = '0 1rem'
            break;
        case 2:
            eid("download-button").disabled = true
            eid("download-button").value = text
            eid("download-button").style.padding = '0 1rem'
            break;
    }
}
document.addEventListener("keydown", function(event) {
    if (event.key == "Tab") {
        eid("download-button").value = '>>'
        eid("download-button").style.padding = '0 1rem'
    }
})
function button() {
    let regex = /https:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()!@:%_\+.~#?&\/\/=]*)/.test(eid("url-input-area").value);
    regex ? changeDownloadButton(1, '>>') : changeDownloadButton(0, '>>');
}
function copy(id, data) {
    let e = document.getElementById(id);
    e.classList.add("text-backdrop");
    data ? navigator.clipboard.writeText(data) : navigator.clipboard.writeText(e.innerText);
    setTimeout(() => { e.classList.remove("text-backdrop") }, 600);
}
function detectColorScheme() {
    let theme = "auto";
    let localTheme = localStorage.getItem("theme");
    if (localTheme) {
        theme = localTheme;
    } else if (!window.matchMedia) {
        theme = "dark"
    }
    document.documentElement.setAttribute("data-theme", theme);
}
function popup(type, action, text) {
    eid("popup-backdrop").style.visibility = vis(action);
    switch (type) {
        case "about":
            eid("popup-about").style.visibility = vis(action);
            if (!localStorage.getItem("seenAbout")) localStorage.setItem("seenAbout", "true");
            break;
        case "error":
            eid("desc-error").innerHTML = text;
            eid("popup-error").style.visibility = vis(action);
            break;
        case "download":
            if (action == 1) {
                eid("pd-download").href = text;
                eid("pd-copy").setAttribute("onClick", `copy('pd-copy', '${text}')` );
            }
            eid("popup-download").style.visibility = vis(action);
            break;
        default:
            eid(`popup-${type}`).style.visibility = vis(action);
            break;
    }
}
function changeSwitcher(li, b, u) {
    if (u) localStorage.setItem(li, b);
    if (b) {
        for (i in switchers[li]) {
            (switchers[li][i] == b) ? enable(`${li}-${b}`) : disable(`${li}-${switchers[li][i]}`)
        }
        if (li == "theme") detectColorScheme();
    } else {
        localStorage.setItem(li, switchers[li][0]);
        for (i in switchers[li]) {
            (switchers[li][i] == switchers[li][0]) ? enable(`${li}-${switchers[li][0]}`) : disable(`${li}-${switchers[li][i]}`)
        }
    }
}
function internetError() {
    eid("url-input-area").disabled = false
    changeDownloadButton(2, '!!')
    popup("error", 1, loc.noInternet);
}
function checkbox(action) {
    if (eid(action).checked) {
        localStorage.setItem(action, "true");
        if (action == "alwaysVisibleButton") button();
    } else {
        localStorage.setItem(action, "false");
        if (action == "alwaysVisibleButton") button();
    }
}
function loadSettings() {
    if (localStorage.getItem("alwaysVisibleButton") == "true") {
        eid("alwaysVisibleButton").checked = true;
        eid("download-button").value = '>>'
        eid("download-button").style.padding = '0 1rem';
    }
    if (localStorage.getItem("downloadPopup") == "true" && !isIOS) {
        eid("downloadPopup").checked = true;
    }
    changeSwitcher("theme", localStorage.getItem("theme"))
    changeSwitcher("youtubeFormat", localStorage.getItem("youtubeFormat"))
    changeSwitcher("quality", localStorage.getItem("quality"))
}
async function download(url) {
    changeDownloadButton(2, '...');
    eid("url-input-area").disabled = true;
    let format = '';
    if (url.includes("youtube.com/") || url.includes("/youtu.be/")) {
        format = `&format=${localStorage.getItem("youtubeFormat")}`
    }
    fetch(`/api/json?quality=${localStorage.getItem("quality")}${format}&url=${encodeURIComponent(url)}`).then(async (response) => {
        let j = await response.json();
        if (j.status != "error" && j.status != "rate-limit") {
            if (j.url) {
                switch (j.status) {
                    case "redirect":
                        changeDownloadButton(2, '>>>')
                        setTimeout(() => {
                            changeDownloadButton(1, '>>')
                            eid("url-input-area").disabled = false
                        }, 3000)
                        if (localStorage.getItem("downloadPopup") == "true") {
                            popup('download', 1, j.url)
                        } else {
                            window.open(j.url, '_blank');
                        }
                        break;
                    case "stream":
                        changeDownloadButton(2, '?..')
                        fetch(`${j.url}&p=1&origin=front`).then(async (response) => {
                            let jp = await response.json();
                            if (jp.status == "continue") {
                                changeDownloadButton(2, '>>>')
                                window.location.href = j.url
                                setTimeout(() => {
                                    changeDownloadButton(1, '>>')
                                    eid("url-input-area").disabled = false
                                }, 5000)
                            } else {
                                eid("url-input-area").disabled = false
                                changeDownloadButton(2, '!!')
                                popup("error", 1, jp.text);
                            }
                        }).catch((error) => internetError());
                        break;
                }
            } else {
                eid("url-input-area").disabled = false
                changeDownloadButton(2, '!!')
                popup("error", 1, loc.noURLReturned);
            }
        } else {
            eid("url-input-area").disabled = false
            changeDownloadButton(2, '!!')
            popup("error", 1, j.text);
        }
    }).catch((error) => internetError());
}
window.onload = function () {
    loadSettings();
    detectColorScheme();
    changeDownloadButton(0, '>>');
    eid("cobalt-main-box").style.visibility = 'visible';
    eid("footer").style.visibility = 'visible';
    eid("url-input-area").value = "";
    if (!localStorage.getItem("seenAbout")) popup('about', 1);
    if (isIOS) localStorage.setItem("downloadPopup", "true");
}
eid("url-input-area").addEventListener("keyup", (event) => {
    if (event.key === 'Enter') {
        eid("download-button").click();
    }
})