Playing a DASH content using SetServerCertificate.

[Adrián Gómez Llorente]

Hi,

I'm trying to play a content from the demo page using the SetServerCertificate method to avoid certificate requests. This is the information I'm using:

• MPD: https://storage.googleapis.com/shaka-demo-assets/angel-one-widevine/dash.mpd
• License Server URL: https://widevine-proxy.appspot.com/proxy

My steps are:

1. Request the serverCertificate:

var http = new XMLHttpRequest();

http.open('POST', 'https://widevine-proxy.appspot.com/proxy', true);

http.responseType = 'arraybuffer';

http.onload = function() {

  var arrayBuffer = http.response;

  if (arrayBuffer) {

    cert = new Uint8Array(arrayBuffer);

  }

};

http.send(atob('CAQ='));

I have a question here:

• Body send (CAQ=) in the request to the serverCertificate is always the same or it depends on the proxy/content?

2. Configure serverCertificate in shaka-player

player.configure({

  drm: {

    advanced: {

      'com.widevine.alpha': {

        serverCertificate: cert

      }

    }

  }

});

As you can see above I'm converting the arrayBuffer returned in the response to Uint8Array and this value is passed to the player as it is shown above.

Errors obtained

Results obtained are:

• LicenseServer is returning a 200OK with a body including what it seems a proper certificate.
• Player fails playback because SetServerCertificate method rejects with this error: "Rejected with system code (17)"
• Shaka-player fails fails with a code 6004

SetServerCertificate error:

Shaka-player error:

Would it be possible to have an example of the whole flow to configure the shaka-player with a proper certificate for the content specified above or other?

[Jacob Trimble]

Unfortunately, (IIRC) there is no way to publically get the server certificate for Widevine.  You'll need to talk to Widevine support directly to get the certificate and host that file on your server.  It also depends on which license server you are using (not the proxy).  What you are doing will contain the server certificate, but it is a special request the CDM makes to get it.  You can't just pass the response to setServerCertifiacate since it is wrapped.

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