package __TOP_LEVEL_PACKAGE__.__SEGMENT_PACKAGE__;
import __TOP_LEVEL_PACKAGE__.client.scaffold.gae.GaeAuthenticationFailureEvent;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.Response;
import com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport;
import com.google.web.bindery.requestfactory.shared.ServerFailure;
import com.google.gwt.user.client.Window;
/**
* Extends DefaultRequestTransport to handle the authentication failures
* reported by {@link com.google.gwt.sample.gaerequest.server.GaeAuthFilter}
*/
public class GaeAuthRequestTransport extends DefaultRequestTransport {
private final EventBus eventBus;
public GaeAuthRequestTransport(EventBus eventBus) {
this.eventBus = eventBus;
}
@Override
protected RequestCallback createRequestCallback(
final TransportReceiver receiver) {
final RequestCallback superCallback = super.createRequestCallback(receiver);
return new RequestCallback() {
public void onResponseReceived(Request request, Response response) {
/*
* The GaeAuthFailure filter responds with Response.SC_UNAUTHORIZED and
* adds a "login" url header if the user is not logged in. When we
* receive that combo, post an event so that the app can handle things
* as it sees fit.
*/
int statusCode = response.getStatusCode();
if (Response.SC_UNAUTHORIZED == statusCode) {
String loginUrl = response.getHeader("login");
if (loginUrl != null) {
/*
* Hand the receiver a non-fatal callback, so that
* com.google.web.bindery.requestfactory.shared.Receiver will not post a
* runtime exception.
*/
receiver.onTransportFailure(new ServerFailure("Unauthenticated user", null, null, false /* not fatal */));
eventBus.fireEvent(new GaeAuthenticationFailureEvent(loginUrl));
return;
}
}
if (statusCode == 0) {
/*
* A response with no status follows the SC_UNAUTHORIZED.
* Report it as non-fatal, so that
* com.google.web.bindery.requestfactory.shared.Receiver will not post a
* runtime exception
*/
receiver.onTransportFailure(new ServerFailure("Status zero response, probably after auth failure", null, null, false /* not fatal */));
return;
}
superCallback.onResponseReceived(request, response);
}
public void onError(Request request, Throwable exception) {
superCallback.onError(request, exception);
}
};
}
@Override
protected RequestBuilder createRequestBuilder() {
RequestBuilder builder = super.createRequestBuilder();
// GaeAuthFilter uses this to construct login url
builder.setHeader("requestUrl", Window.Location.getHref());
return builder;
}
}