package ca.carleton.gcrc.couch.user.token;
import ca.carleton.gcrc.security.ber.BerConstructed;
import ca.carleton.gcrc.security.ber.BerObject;
import ca.carleton.gcrc.security.ber.encoding.BerDecoder;
public class TokenDecoder {
public Token decode(byte[] encodedToken) throws Exception {
try {
BerObject outerObj = BerDecoder.decode(encodedToken);
if( false == outerObj.isTypeConstructed()
|| false == (outerObj instanceof BerConstructed) ){
throw new Exception("Object is not constructed.");
}
BerConstructed outer = (BerConstructed)outerObj;
if( Token.APPLICATION_TYPE_CREATION == outer.getType() ){
return CreationToken.decode(outer);
} else {
throw new Exception("Unrecognized type: "+outer.getType());
}
} catch(Exception e) {
throw new Exception("Error while deccoding token", e);
}
}
}