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Check if PlayReady license message is wrapped in XML. #815

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Merged
joeyparrish merged 4 commits into from
May 18, 2017
Merged

Check if PlayReady license message is wrapped in XML. #815

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54596dd
Add check in DrmEngine#unpackPlayReadyRequest_ to see if license
May 17, 2017
8da0342
Add check in DrmEngine#unpackPlayReadyRequest_ to see if license
May 17, 2017
199e6f0
Wrap `request.body` in `new Uint8Array`, since it is typed as
May 17, 2017
83ad5a2
Merge branch 'feature/tizenSupport_playreadyMessage' of https://githu…
May 17, 2017
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1 change: 1 addition & 0 deletions CONTRIBUTORS
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@

Andy Hochhaus <ahochhaus@samegoal.com>
Chad Assareh <assareh@google.com>
Chris Fillmore <fillmore.chris@gmail.com>
Costel Madalin Grecu <madalin.grecu@adswizz.com>
Donato Borrello <donato@jwplayer.com>
Duc Pham <duc.pham@edgeware.tv>
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18 changes: 14 additions & 4 deletions lib/media/drm_engine.js
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Expand Up @@ -1106,9 +1106,19 @@ shaka.media.DrmEngine.prototype.sendLicenseRequest_ = function(event) {
* @private
*/
shaka.media.DrmEngine.prototype.unpackPlayReadyRequest_ = function(request) {
// The PlayReady license message as it comes from the CDM can't be directly
// delivered to a license server. Other CDMs do not seem to need this kind
// of special handling.
// PlayReady CDMs in some clients (e.g. IE11, Edge) wrap the license message
// in UTF-16 encoded XML which can't be directly delivered to a license
// server. However, not all clients exhibit this behaviour. The Tizen
// PlayReady CDM message is UTF-8 encoded and can be passed to the license
// server as-is. Other CDMs do not seem to need this kind of special
// handling.
var xml = String.fromCharCode.apply(null, request.body);
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@joeyparrish joeyparrish May 17, 2017

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request.body is typed as an ArrayBuffer, so you will need to wrap that in "new Uint8Array".

Here's a demo of fromCharCode applied to both a Uint8Array and an ArrayBuffer:

u = new Uint8Array([61, 62, 63, 64, 65]);

String.fromCharCode.apply(null, u);
"=>?@A"

String.fromCharCode.apply(null, u.buffer);
""

If request.body is a Uint8Array at runtime, wrapping it again will not cause a problem.

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@chrisfillmore chrisfillmore May 17, 2017

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Updated.


if (xml.indexOf('<PlayReadyKeyMessage') !== 0) {
// The message is not wrapped.
request.headers['Content-Type'] = 'text/xml; charset=utf-8';
return;
}

// The raw license message is UTF-16-encoded XML. We need to unpack the
// Challenge element (base64-encoded string containing the actual license
Expand All @@ -1132,7 +1142,7 @@ shaka.media.DrmEngine.prototype.unpackPlayReadyRequest_ = function(request) {
// </LicenseAcquisition>
// </PlayReadyKeyMessage>

var xml = shaka.util.StringUtils.fromUTF16(
xml = shaka.util.StringUtils.fromUTF16(
request.body, true /* littleEndian */);
var dom = new DOMParser().parseFromString(xml, 'application/xml');

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