vbatts/ntfy
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SSE

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This commit is contained in:
Philipp Heckel 2021-10-23 13:21:33 -04:00
parent 5c2b6d18ec
commit 630ecd351f
2 changed files with 108 additions and 60 deletions
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92
server/index.html
View file

@ -8,54 +8,73 @@
<body>
<h1>ntfy.sh</h1>
Topics:
<ul id="topics">
</ul>
<p>
ntfy.sh is a super simple pub-sub notification service. It allows you to send desktop and (soon) phone notifications
via scripts, without signup or cost. It's entirely free and open source.
</p>
<input type="text" id="topic" size="64" autofocus />
<button id="topicButton">Add topic</button>
<button onclick="notifyMe('test'); return false">Notify me!</button>
<p>
<b>Usage:</b> You can subscribe to a topic either in this web UI, or in your own app by subscribing to an SSE/EventSource
or JSON feed. Once subscribed, you can publish messages via PUT or POST.
</p>
<div id="error"></div>
<form id="subscribeForm">
<input type="text" id="topicField" size="64" autofocus />
<input type="submit" id="subscribeButton" value="Subscribe topic" />
</form>
Topics:
<ul id="topicsList">
</ul>
<script type="text/javascript">
window.onload = function() {
let topics = {};
const topicField = document.getElementById("topic");
const topicsList = document.getElementById("topics");
const topicButton = document.getElementById("topicButton");
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");
const subscribe = function (topic) {
let conn = new WebSocket(`ws://${document.location.host}/${topic}/ws`);
conn.onclose = function (evt) {
errorField.innerHTML = "Connection closed";
if (Notification.permission !== "granted") {
Notification.requestPermission().then(function (permission) {
if (permission === "granted") {
subscribeInternal(topic);
}
});
} else {
subscribeInternal(topic);
}
};
conn.onmessage = function (evt) {
notify(evt.data)
const subscribeInternal = function (topic) {
let eventSource = new EventSource(`${topic}/sse`);
eventSource.onerror = function (e) {
console.log(e);
errorField.innerHTML = "Error " + e;
};
topics[topic] = conn;
eventSource.onmessage = function (e) {
const event = JSON.parse(e.data);
new Notification(event.message);
};
topics[topic] = eventSource;
let topicEntry = document.createElement('li');
topicEntry.id = `topic-${topic}`;
topicEntry.innerHTML = `${topic} <button onclick="unsubscribe('${topic}')">Unsubscribe</button>`;
topicsList.appendChild(topicEntry);
};
const notify = function (msg) {
if (!("Notification" in window)) {
alert("This browser does not support desktop notification");
} else if (Notification.permission === "granted") {
var notification = new Notification(msg);
} else if (Notification.permission !== "denied") {
Notification.requestPermission().then(function (permission) {
if (permission === "granted") {
var notification = new Notification(msg);
}
});
}
}
const unsubscribe = function(topic) {
topics[topic].close();
document.getElementById(`topic-${topic}`).remove();
};
topicButton.onclick = function () {
subscribeForm.onsubmit = function () {
alert("hi")
if (!topicField.value) {
return false;
}
@ -63,16 +82,15 @@ Topics:
return false;
};
if (!window["Notification"]) {
errorField.innerHTML = "Your browser does not support desktop notifications";
if (!window["Notification"] || !window["EventSource"]) {
errorField.innerHTML = "Your browser is not compatible to use the web-based desktop notifications.";
topicField.disabled = true;
topicButton.disabled = true;
} else if (!window["Notification"]) {
errorField.innerHTML = "Your browser does not support WebSockets.";
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;
topicButton.disabled = true;
subscribeButton.disabled = true;
}
};
</script>
</body>

36
server/server.go
View file

@ -5,6 +5,7 @@ import (
_ "embed" // required for go:embed
"encoding/json"
"errors"
"fmt"
"github.com/gorilla/websocket"
"io"
"log"
@ -31,8 +32,9 @@ const (
var (
topicRegex = regexp.MustCompile(`^/[^/]+$`)
wsRegex = regexp.MustCompile(`^/[^/]+/ws$`)
jsonRegex = regexp.MustCompile(`^/[^/]+/json$`)
sseRegex = regexp.MustCompile(`^/[^/]+/sse$`)
wsRegex = regexp.MustCompile(`^/[^/]+/ws$`)
wsUpgrader = websocket.Upgrader{
ReadBufferSize: messageLimit,
WriteBufferSize: messageLimit,
@ -82,7 +84,9 @@ func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request) error {
} else if r.Method == http.MethodGet && wsRegex.MatchString(r.URL.Path) {
return s.handleSubscribeWS(w, r)
} else if r.Method == http.MethodGet && jsonRegex.MatchString(r.URL.Path) {
return s.handleSubscribeHTTP(w, r)
return s.handleSubscribeJSON(w, r)
} else if r.Method == http.MethodGet && sseRegex.MatchString(r.URL.Path) {
return s.handleSubscribeSSE(w, r)
} else if (r.Method == http.MethodPut || r.Method == http.MethodPost) && topicRegex.MatchString(r.URL.Path) {
return s.handlePublishHTTP(w, r)
}
@ -112,7 +116,7 @@ func (s *Server) handlePublishHTTP(w http.ResponseWriter, r *http.Request) error
return t.Publish(msg)
}
func (s *Server) handleSubscribeHTTP(w http.ResponseWriter, r *http.Request) error {
func (s *Server) handleSubscribeJSON(w http.ResponseWriter, r *http.Request) error {
t := s.createTopic(strings.TrimSuffix(r.URL.Path[1:], "/json")) // Hack
subscriberID := t.Subscribe(func (msg *message) error {
if err := json.NewEncoder(w).Encode(&msg); err != nil {
@ -131,6 +135,32 @@ func (s *Server) handleSubscribeHTTP(w http.ResponseWriter, r *http.Request) err
return nil
}
func (s *Server) handleSubscribeSSE(w http.ResponseWriter, r *http.Request) error {
t := s.createTopic(strings.TrimSuffix(r.URL.Path[1:], "/sse")) // Hack
subscriberID := t.Subscribe(func (msg *message) error {
var buf bytes.Buffer
if err := json.NewEncoder(&buf).Encode(&msg); err != nil {
return err
}
m := fmt.Sprintf("data: %s\n\n", buf.String())
if _, err := io.WriteString(w, m); err != nil {
return err
}
if fl, ok := w.(http.Flusher); ok {
fl.Flush()
}
return nil
})
defer t.Unsubscribe(subscriberID)
w.Header().Set("Content-Type", "text/event-stream")
w.WriteHeader(http.StatusOK)
select {
case <-t.ctx.Done():
case <-r.Context().Done():
}
return nil
}
func (s *Server) handleSubscribeWS(w http.ResponseWriter, r *http.Request) error {
conn, err := wsUpgrader.Upgrade(w, r, nil)
if err != nil {