Custom Listener Authentication Webhook

Custom Listener Authentication allows you make your audio stream private and accessible only to authorized listeners. When a listener connects to your stream, Radio Mast will make an HTTP request (or "webhook") to a URL of your choice, and based on the response from that URL, the listener will be allowed or denied access. This allows you to integrate your own authentication system, giving you flexibility over how you authenticate listeners.

Custom Listener Authentication is included in all Radio Mast streaming plans.

Configuring Custom Listener Authentication

After logging into Radio Mast:

  1. Click Streams on the left.
  2. Click the stream you'd like to configure.
  3. Select the Configuration tab.
  4. Under Listener Authentication, click Custom. Enter the URL of your authentication service (see below).
  5. Click Save Stream to apply your settings.

Webhook Specification

Listener authentication is performed using HTTP POST requests. When a listener connects, Radio Mast will make an HTTP POST request to your custom listener authentication URL. Based on the response from the request, the listener will then either be allowed to connect or be rejected. A denied listener will receive a HTTP 401 Unauthorized response.

Both HTTP and HTTPS webhook URLs are supported.

To authorize the listener, the HTTP header icecast-auth-user: 1 must be provided in your response. If this header is not found, the listener will be denied with an HTTP 401 Unauthorized response.

Parameters for the HTTP POST request are URL encoded as regular form data, not JSON encoded. The Content-Type is application/x-www-form-urlencoded.

The parameters included with the HTTP POST request for Listener Authentication are as following:

POST Parameters:
  • action - This will be listener_add.
  • mount - The URL path the listener is connecting to, including any query string. (eg. /mystream?token=1234)
  • server - The local IP of the Radio Mast streaming edge server.
  • port - The port the listener is connecting to.
  • ip - The IP of the listener.
  • user - The username provided by the listener, if any. (via HTTP Basic Authentication).
  • pass - The password provided by the listener, if any.
  • client - A unique 64-bit integer that identifies this listener for the duration of the connection.
  • agent - The HTTP user-agent header provided by the listener.
  • referrer - The HTTP referrer header provided by the listener.
  • listener-count - The current listener count to the stream, excluding the pending new listener.


To authenticate listeners, we recommend generating unique security tokens for each user that expire after a few hours. Append this token to your stream URL as a query string parameter and validate it in your authentication backend.

For example, if you were to generate and store the unique token "12345" for a given user, you could append this to the stream URL provided to the user, like this:

When the connects to your stream, Radio Mast will make an HTTP POST request to your server. The mount POST parameter would contain the value 9fc0077d-ab22-4f8b-b249-94f4bc65996b?token=12345, from which the token could be parsed. Your backend would then verify that token 12345 is valid at the current time.

Monitoring Authenticated Streams

Radio Mast Stream Monitoring may be unable to directly monitor your authenticated stream, as makes an HTTP request to your stream without any extra parameters.

As a workaround, your authentication webhook backend could be configured with a special security token to be used with monitoring only. You can then set up monitoring on a stream URL that includes this special security token:

For example, your backend could try to ensure this URL passes authentication: