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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>ntfy.sh</title>
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<style>
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body { font-size: 1.2em; line-height: 130%; }
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#error { color: darkred; font-style: italic; }
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#main { max-width: 900px; margin: 0 auto 50px auto; }
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</style>
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</head>
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<body>
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<div id="main">
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<h1>ntfy.sh - simple HTTP-based pub-sub</h1>
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<p>
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<b>ntfy</b> (pronounce: <i>notify</i>) is a simple <b>HTTP-based pub-sub notification service and tool</b>.
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It allows you to send <b>desktop notifications via scripts</b>, entirely <b>without signup or cost</b>.
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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 id="error"></p>
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<h2>Subscribe to a topic</h2>
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<p>
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Topics are created on the fly by subscribing to them. You can create and subscribe to a topic either in this web UI, or in
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your own app by subscribing to an <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource">EventSource</a>,
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a JSON feed, or raw feed.
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</p>
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<p>
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Because there is no sign-up, <b>the topic is essentially a password</b>, so pick something that's not easily guessable.
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</p>
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<h3>Subscribe via web</h3>
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<p>
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If you subscribe to a topic via this web UI in the field below, messages published to any subscribed topic
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will show up as <b>desktop notification</b>.
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</p>
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<form id="subscribeForm">
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<p>
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<label for="topicField">Topic ID:</label>
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<input type="text" id="topicField" size="64" placeholder="Letters, numbers, _ and -" pattern="[-_A-Za-z]{1,64}" autofocus />
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<input type="submit" id="subscribeButton" value="Subscribe topic" />
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</p>
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</form>
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<p id="topicsHeader">Subscribed topics:</p>
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<ul id="topicsList"></ul>
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<h3>Subscribe via your app, or via the CLI</h3>
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<tt>
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curl -s ntfy.sh/mytopic/raw # one message per line (\n are replaced with a space)<br/>
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curl -s ntfy.sh/mytopic/json # one JSON message per line<br/>
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curl -s ntfy.sh/mytopic/sse # server-sent events (SSE) stream
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</tt>
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<h3>Publishing messages</h3>
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<p>
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Publishing messages can be done via PUT or POST using. Here's an example using <tt>curl</tt>:
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</p>
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<tt>
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curl -d "long process is done" ntfy.sh/mytopic
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</tt>
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<p>
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Messages published to a non-existing topic or a topic without subscribers will not be delivered later.
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There is (currently) no buffering of any kind. If you're not listening, the message won't be delivered.
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</p>
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</div>
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<script type="text/javascript">
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let topics = {};
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const topicsHeader = document.getElementById("topicsHeader");
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const topicsList = document.getElementById("topicsList");
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const topicField = document.getElementById("topicField");
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const subscribeButton = document.getElementById("subscribeButton");
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const subscribeForm = document.getElementById("subscribeForm");
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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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showNotificationDeniedError();
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}
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});
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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) => {
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setTimeout(() => {
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// Render list entry
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let topicEntry = document.getElementById(`topic-${topic}`);
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if (!topicEntry) {
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topicEntry = document.createElement('li');
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topicEntry.id = `topic-${topic}`;
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topicEntry.innerHTML = `${topic} <button onclick="unsubscribe('${topic}')">Unsubscribe</button>`;
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topicsList.appendChild(topicEntry);
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}
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topicsHeader.style.display = '';
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// Open event source
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let eventSource = new EventSource(`${topic}/sse`);
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eventSource.onopen = () => {
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topicEntry.innerHTML = `${topic} <button onclick="unsubscribe('${topic}')">Unsubscribe</button>`;
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delaySec = 0; // Reset on successful connection
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};
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eventSource.onerror = (e) => {
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const newDelaySec = (delaySec + 5 <= 30) ? delaySec + 5 : 30;
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topicEntry.innerHTML = `${topic} <i>(Reconnecting in ${newDelaySec}s ...)</i> <button onclick="unsubscribe('${topic}')">Unsubscribe</button>`;
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eventSource.close()
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subscribeInternal(topic, newDelaySec);
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};
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eventSource.onmessage = (e) => {
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const event = JSON.parse(e.data);
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new Notification(event.message);
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};
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topics[topic] = eventSource;
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localStorage.setItem('topics', JSON.stringify(Object.keys(topics)));
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}, 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];
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localStorage.setItem('topics', JSON.stringify(Object.keys(topics)));
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document.getElementById(`topic-${topic}`).remove();
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if (Object.keys(topics).length === 0) {
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topicsHeader.style.display = 'none';
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}
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};
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const showError = (msg) => {
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errorField.innerHTML = msg;
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topicField.disabled = true;
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subscribeButton.disabled = true;
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};
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const showBrowserIncompatibleError = () => {
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showError("Your browser is not compatible to use the web-based desktop notifications.");
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};
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const showNotificationDeniedError = () => {
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showError("You have blocked desktop notifications for this website. Please unblock them and refresh to use the web-based desktop notifications.");
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};
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subscribeForm.onsubmit = function () {
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if (!topicField.value) {
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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"]) {
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showBrowserIncompatibleError();
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} else if (Notification.permission === "denied") {
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showNotificationDeniedError();
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}
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// Reset UI
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topicField.value = "";
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// Restore topics
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const storedTopics = localStorage.getItem('topics');
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if (storedTopics && Notification.permission === "granted") {
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const storedTopicsArray = JSON.parse(storedTopics)
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storedTopicsArray.forEach((topic) => { subscribeInternal(topic, 0); });
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if (storedTopicsArray.length === 0) {
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topicsHeader.style.display = 'none';
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}
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} else {
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topicsHeader.style.display = 'none';
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}
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</script>
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</body>
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</html>
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