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// Expect utf8decoder and utf8decoder to be TextEncoder('utf-8') and TextDecoder('utf-8') respectively
function MessageHandler( keysystem, content ) {
this._keysystem = keysystem;
this._content = content;
this.messagehandler = MessageHandler.prototype.messagehandler.bind( this );
this.servercertificate = undefined;
}
MessageHandler.prototype.messagehandler = function messagehandler( messageType, message )
{
if ( messageType === 'license-request' )
{
var request = fromUtf8( message );
var keys = request.kids.map( function( kid ) {
var key;
for( var i=0; i < this._content.keys.length; ++i )
{
if ( base64urlEncode( this._content.keys[ i ].kid ) === kid )
{
key = base64urlEncode( this._content.keys[ i ].key );
break;
}
}
return { kty: 'oct', kid: kid, k: key };
}.bind( this ) );
return Promise.resolve( toUtf8( { keys: keys } ) );
}
else if ( messageType === 'license-release' )
{
var release = fromUtf8( message );
// TODO: Check the license release message here
return Promise.resolve( toUtf8( { kids: release.kids } ) );
}
throw new TypeError( 'Unsupported message type for ClearKey' );
};
MessageHandler.prototype.createJWKSet = function createJWKSet(keyId, key) {
var jwkSet = '{"keys":[';
for (var i = 0; i < arguments.length; i++) {
if (i != 0)
jwkSet += ',';
jwkSet += arguments[i];
}
jwkSet += ']}';
return jwkSet;
};
MessageHandler.prototype.createJWK = function createJWK(keyId, key) {
var jwk = '{"kty":"oct","alg":"A128KW","kid":"';
jwk += base64urlEncode(keyId);
jwk += '","k":"';
jwk += base64urlEncode(key);
jwk += '"}';
return jwk;
};
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