//
// ========================================================================
// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package com.facebook.presto.jdbc.internal.jetty.client;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.facebook.presto.jdbc.internal.jetty.client.api.Authentication;
import com.facebook.presto.jdbc.internal.jetty.client.api.ContentResponse;
import com.facebook.presto.jdbc.internal.jetty.client.api.Request;
import com.facebook.presto.jdbc.internal.jetty.client.api.Response;
import com.facebook.presto.jdbc.internal.jetty.client.api.Result;
import com.facebook.presto.jdbc.internal.jetty.client.util.BufferingResponseListener;
import com.facebook.presto.jdbc.internal.jetty.http.HttpHeader;
import com.facebook.presto.jdbc.internal.jetty.util.log.Log;
import com.facebook.presto.jdbc.internal.jetty.util.log.Logger;
public abstract class AuthenticationProtocolHandler implements ProtocolHandler
{
public static final int DEFAULT_MAX_CONTENT_LENGTH = 4096;
public static final Logger LOG = Log.getLogger(AuthenticationProtocolHandler.class);
private static final Pattern AUTHENTICATE_PATTERN = Pattern.compile("([^\\s]+)\\s+realm=\"([^\"]+)\"(.*)", Pattern.CASE_INSENSITIVE);
private static final String AUTHENTICATION_ATTRIBUTE = AuthenticationProtocolHandler.class.getName() + ".authentication";
private final HttpClient client;
private final int maxContentLength;
private final ResponseNotifier notifier;
protected AuthenticationProtocolHandler(HttpClient client, int maxContentLength)
{
this.client = client;
this.maxContentLength = maxContentLength;
this.notifier = new ResponseNotifier();
}
protected HttpClient getHttpClient()
{
return client;
}
protected abstract HttpHeader getAuthenticateHeader();
protected abstract HttpHeader getAuthorizationHeader();
protected abstract URI getAuthenticationURI(Request request);
@Override
public Response.Listener getResponseListener()
{
// Return new instances every time to keep track of the response content
return new AuthenticationListener();
}
private class AuthenticationListener extends BufferingResponseListener
{
private AuthenticationListener()
{
super(maxContentLength);
}
@Override
public void onComplete(Result result)
{
HttpRequest request = (HttpRequest)result.getRequest();
ContentResponse response = new HttpContentResponse(result.getResponse(), getContent(), getEncoding());
if (result.isFailed())
{
Throwable failure = result.getFailure();
LOG.debug("Authentication challenge failed {}", failure);
forwardFailureComplete(request, result.getRequestFailure(), response, result.getResponseFailure());
return;
}
HttpConversation conversation = request.getConversation();
if (conversation.getAttribute(AUTHENTICATION_ATTRIBUTE) != null)
{
// We have already tried to authenticate, but we failed again
LOG.debug("Bad credentials for {}", request);
forwardSuccessComplete(request, response);
return;
}
HttpHeader header = getAuthenticateHeader();
List<Authentication.HeaderInfo> headerInfos = parseAuthenticateHeader(response, header);
if (headerInfos.isEmpty())
{
LOG.debug("Authentication challenge without {} header", header);
forwardFailureComplete(request, null, response, new HttpResponseException("HTTP protocol violation: Authentication challenge without " + header + " header", response));
return;
}
Authentication authentication = null;
Authentication.HeaderInfo headerInfo = null;
URI uri = getAuthenticationURI(request);
if (uri != null)
{
for (Authentication.HeaderInfo element : headerInfos)
{
authentication = client.getAuthenticationStore().findAuthentication(element.getType(), uri, element.getRealm());
if (authentication != null)
{
headerInfo = element;
break;
}
}
}
if (authentication == null)
{
LOG.debug("No authentication available for {}", request);
forwardSuccessComplete(request, response);
return;
}
final Authentication.Result authnResult = authentication.authenticate(request, response, headerInfo, conversation);
LOG.debug("Authentication result {}", authnResult);
if (authnResult == null)
{
forwardSuccessComplete(request, response);
return;
}
conversation.setAttribute(AUTHENTICATION_ATTRIBUTE, true);
Request newRequest = client.copyRequest(request, request.getURI());
authnResult.apply(newRequest);
newRequest.onResponseSuccess(new Response.SuccessListener()
{
@Override
public void onSuccess(Response response)
{
client.getAuthenticationStore().addAuthenticationResult(authnResult);
}
}).send(null);
}
private void forwardSuccessComplete(HttpRequest request, Response response)
{
HttpConversation conversation = request.getConversation();
conversation.updateResponseListeners(null);
notifier.forwardSuccessComplete(conversation.getResponseListeners(), request, response);
}
private void forwardFailureComplete(HttpRequest request, Throwable requestFailure, Response response, Throwable responseFailure)
{
HttpConversation conversation = request.getConversation();
conversation.updateResponseListeners(null);
notifier.forwardFailureComplete(conversation.getResponseListeners(), request, requestFailure, response, responseFailure);
}
private List<Authentication.HeaderInfo> parseAuthenticateHeader(Response response, HttpHeader header)
{
// TODO: these should be ordered by strength
List<Authentication.HeaderInfo> result = new ArrayList<>();
List<String> values = Collections.list(response.getHeaders().getValues(header.asString()));
for (String value : values)
{
Matcher matcher = AUTHENTICATE_PATTERN.matcher(value);
if (matcher.matches())
{
String type = matcher.group(1);
String realm = matcher.group(2);
String params = matcher.group(3);
Authentication.HeaderInfo headerInfo = new Authentication.HeaderInfo(type, realm, params, getAuthorizationHeader());
result.add(headerInfo);
}
}
return result;
}
}
}