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<!DOCTYPE html>
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< head >
< title > ntfy.sh< / title >
< style >
< / style >
< / head >
< body >
< h1 > ntfy.sh< / h1 >
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< p >
ntfy.sh is a super simple pub-sub notification service. It allows you to send desktop and (soon) phone notifications
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via scripts, without signup or cost. It's entirely free and open source. You can find the source code < a href = "https://github.com/binwiederhier/ntfy" > on GitHub< / a > .
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< / p >
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< p >
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You can subscribe to a topic either in this web UI, or in your own app by subscribing to an SSE/EventSource
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or JSON feed. Once subscribed, you can publish messages via PUT or POST.
< / p >
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< p id = "error" > < / p >
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< form id = "subscribeForm" >
< input type = "text" id = "topicField" size = "64" autofocus / >
< input type = "submit" id = "subscribeButton" value = "Subscribe topic" / >
< / form >
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< p > Topics:< / p >
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< ul id = "topicsList" >
< / ul >
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< script type = "text/javascript" >
let topics = {};
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const topicField = document.getElementById("topicField");
const topicsList = document.getElementById("topicsList");
const subscribeButton = document.getElementById("subscribeButton");
const subscribeForm = document.getElementById("subscribeForm");
const errorField = document.getElementById("error");
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const subscribe = (topic) => {
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if (Notification.permission !== "granted") {
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Notification.requestPermission().then((permission) => {
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if (permission === "granted") {
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subscribeInternal(topic, 0);
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}
});
} else {
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subscribeInternal(topic, 0);
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}
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};
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const subscribeInternal = (topic, delaySec) => {
setTimeout(() => {
// Render list entry
let topicEntry = document.getElementById(`topic-${topic}`);
if (!topicEntry) {
topicEntry = document.createElement('li');
topicEntry.id = `topic-${topic}`;
topicEntry.innerHTML = `${topic} < button onclick = "unsubscribe('${topic}')" > Unsubscribe< / button > `;
topicsList.appendChild(topicEntry);
}
// Open event source
let eventSource = new EventSource(`${topic}/sse`);
eventSource.onopen = () => {
topicEntry.innerHTML = `${topic} < button onclick = "unsubscribe('${topic}')" > Unsubscribe< / button > `;
delaySec = 0; // Reset on successful connection
};
eventSource.onerror = (e) => {
console.log("onerror")
const newDelaySec = (delaySec + 5 < = 30) ? delaySec + 5 : 30;
topicEntry.innerHTML = `${topic} < i > (Reconnecting in ${newDelaySec}s ...)< / i > < button onclick = "unsubscribe('${topic}')" > Unsubscribe< / button > `;
eventSource.close()
subscribeInternal(topic, newDelaySec);
};
eventSource.onmessage = (e) => {
const event = JSON.parse(e.data);
new Notification(event.message);
};
topics[topic] = eventSource;
localStorage.setItem('topics', JSON.stringify(Object.keys(topics)));
}, delaySec * 1000);
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};
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const unsubscribe = (topic) => {
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topics[topic].close();
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delete topics[topic];
localStorage.setItem('topics', JSON.stringify(Object.keys(topics)));
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document.getElementById(`topic-${topic}`).remove();
};
subscribeForm.onsubmit = function () {
if (!topicField.value) {
return false;
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}
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subscribe(topicField.value);
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topicField.value = "";
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return false;
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};
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// Disable Web UI if notifications of EventSource are not available
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if (!window["Notification"] || !window["EventSource"]) {
errorField.innerHTML = "Your browser is not compatible to use the web-based desktop notifications.";
topicField.disabled = true;
subscribeButton.disabled = true;
} else if (Notification.permission === "denied") {
errorField.innerHTML = "You have blocked desktop notifications for this website. Please unblock them and refresh to use the web-based desktop notifications.";
topicField.disabled = true;
subscribeButton.disabled = true;
}
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// Reset UI
topicField.value = "";
// Restore topics
const storedTopics = localStorage.getItem('topics');
if (storedTopics) {
JSON.parse(storedTopics).forEach((topic) => {
subscribeInternal(topic, 0);
});
}
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< / script >
< / body >
< / html >
