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Examples, CORS

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This commit is contained in:
Philipp Heckel 2021-10-24 13:34:15 -04:00
parent 1ab0282101
commit 39574c954b
2 changed files with 68 additions and 2 deletions
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53
examples/example_eventsource_sse.html Normal file
View file

@ -0,0 +1,53 @@
<!DOCTYPE html>
<html lang="en">
<head>
<title>ntfy.sh: EventSource Example</title>
<style>
body { font-size: 1.2em; line-height: 130%; }
#events { font-family: monospace; }
</style>
</head>
<body>
<h1>ntfy.sh: EventSource Example</h1>
<p>
This is an example showing how to use <a href="https://ntfy.sh">ntfy.sh</a> with
<a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource">EventSource</a>.<br/>
</p>
<button id="publishButton">Send test notification</button>
<p><b>Log:</b></p>
<div id="events"></div>
<script type="text/javascript">
const publishURL = `https://ntfy.sh/example`;
const subscribeURL = `https://ntfy.sh/example/sse`;
const events = document.getElementById('events');
const eventSource = new EventSource(subscribeURL);
// Publish button
document.getElementById("publishButton").onclick = () => {
fetch(publishURL, {
method: 'POST', // works with PUT as well, though that sends an OPTIONS request too!
body: `It is ${new Date().toString()}. This is a test.`
})
};
// Incoming events
eventSource.onopen = () => {
let event = document.createElement('div');
event.innerHTML = `EventSource connected to ${subscribeURL}`;
events.appendChild(event);
};
eventSource.onerror = (e) => {
let event = document.createElement('div');
event.innerHTML = `EventSource error: Failed to connect to ${subscribeURL}`;
events.appendChild(event);
};
eventSource.onmessage = (e) => {
let event = document.createElement('div');
event.innerHTML = e.data;
events.appendChild(event);
};
</script>
</body>
</html>

17
server/server.go
View file

@ -131,6 +131,8 @@ func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request) error {
return s.handleSubscribeRaw(w, r) return s.handleSubscribeRaw(w, r)
} else if (r.Method == http.MethodPut || r.Method == http.MethodPost) && topicRegex.MatchString(r.URL.Path) { } else if (r.Method == http.MethodPut || r.Method == http.MethodPost) && topicRegex.MatchString(r.URL.Path) {
return s.handlePublishHTTP(w, r) return s.handlePublishHTTP(w, r)
} else if r.Method == http.MethodOptions {
return s.handleOptions(w, r)
} }
return errHTTPNotFound return errHTTPNotFound
} }
@ -154,7 +156,11 @@ func (s *Server) handlePublishHTTP(w http.ResponseWriter, r *http.Request) error
Time: time.Now().UnixMilli(), Time: time.Now().UnixMilli(),
Message: string(b), Message: string(b),
} }
return t.Publish(msg) if err := t.Publish(msg); err != nil {
return err
}
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
return nil
} }
func (s *Server) handleSubscribeJSON(w http.ResponseWriter, r *http.Request) error { func (s *Server) handleSubscribeJSON(w http.ResponseWriter, r *http.Request) error {
@ -169,6 +175,7 @@ func (s *Server) handleSubscribeJSON(w http.ResponseWriter, r *http.Request) err
return nil return nil
}) })
defer s.unsubscribe(t, subscriberID) defer s.unsubscribe(t, subscriberID)
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
select { select {
case <-t.ctx.Done(): case <-t.ctx.Done():
case <-r.Context().Done(): case <-r.Context().Done():
@ -194,7 +201,7 @@ func (s *Server) handleSubscribeSSE(w http.ResponseWriter, r *http.Request) erro
}) })
defer s.unsubscribe(t, subscriberID) defer s.unsubscribe(t, subscriberID)
w.Header().Set("Content-Type", "text/event-stream") w.Header().Set("Content-Type", "text/event-stream")
w.WriteHeader(http.StatusOK) w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
if _, err := io.WriteString(w, "event: open\n\n"); err != nil { if _, err := io.WriteString(w, "event: open\n\n"); err != nil {
return err return err
} }
@ -228,6 +235,12 @@ func (s *Server) handleSubscribeRaw(w http.ResponseWriter, r *http.Request) erro
return nil return nil
} }
func (s *Server) handleOptions(w http.ResponseWriter, r *http.Request) error {
w.Header().Set("Access-Control-Allow-Origin", "*") // CORS, allow cross-origin requests
w.Header().Set("Access-Control-Allow-Methods", "GET, PUT, POST")
return nil
}
func (s *Server) createTopic(id string) *topic { func (s *Server) createTopic(id string) *topic {
s.mu.Lock() s.mu.Lock()
defer s.mu.Unlock() defer s.mu.Unlock()