clearkey-messagehandler.js (1890B)
1 // Expect utf8decoder and utf8decoder to be TextEncoder('utf-8') and TextDecoder('utf-8') respectively 2 3 function MessageHandler( keysystem, content ) { 4 this._keysystem = keysystem; 5 this._content = content; 6 this.messagehandler = MessageHandler.prototype.messagehandler.bind( this ); 7 this.servercertificate = undefined; 8 } 9 10 MessageHandler.prototype.messagehandler = function messagehandler( messageType, message ) 11 { 12 if ( messageType === 'license-request' ) 13 { 14 var request = fromUtf8( message ); 15 16 var keys = request.kids.map( function( kid ) { 17 18 var key; 19 for( var i=0; i < this._content.keys.length; ++i ) 20 { 21 if ( base64urlEncode( this._content.keys[ i ].kid ) === kid ) 22 { 23 key = base64urlEncode( this._content.keys[ i ].key ); 24 break; 25 } 26 } 27 28 return { kty: 'oct', kid: kid, k: key }; 29 30 }.bind( this ) ); 31 32 return Promise.resolve( toUtf8( { keys: keys } ) ); 33 } 34 else if ( messageType === 'license-release' ) 35 { 36 var release = fromUtf8( message ); 37 38 // TODO: Check the license release message here 39 40 return Promise.resolve( toUtf8( { kids: release.kids } ) ); 41 } 42 43 throw new TypeError( 'Unsupported message type for ClearKey' ); 44 }; 45 46 MessageHandler.prototype.createJWKSet = function createJWKSet(keyId, key) { 47 var jwkSet = '{"keys":['; 48 for (var i = 0; i < arguments.length; i++) { 49 if (i != 0) 50 jwkSet += ','; 51 jwkSet += arguments[i]; 52 } 53 jwkSet += ']}'; 54 return jwkSet; 55 }; 56 57 MessageHandler.prototype.createJWK = function createJWK(keyId, key) { 58 var jwk = '{"kty":"oct","alg":"A128KW","kid":"'; 59 jwk += base64urlEncode(keyId); 60 jwk += '","k":"'; 61 jwk += base64urlEncode(key); 62 jwk += '"}'; 63 return jwk; 64 };