001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bstefanescu
018 */
019package org.nuxeo.ecm.automation.client.jaxrs.impl;
020
021import java.io.IOException;
022
023import org.apache.commons.logging.Log;
024import org.apache.commons.logging.LogFactory;
025import org.apache.http.HttpException;
026import org.apache.http.HttpHost;
027import org.apache.http.HttpRequest;
028import org.apache.http.HttpRequestInterceptor;
029import org.apache.http.auth.AuthScheme;
030import org.apache.http.auth.AuthScope;
031import org.apache.http.auth.AuthState;
032import org.apache.http.auth.Credentials;
033import org.apache.http.client.CredentialsProvider;
034import org.apache.http.client.protocol.ClientContext;
035import org.apache.http.protocol.ExecutionContext;
036import org.apache.http.protocol.HttpContext;
037
038public class HttpPreemptiveAuthInterceptor implements HttpRequestInterceptor {
039
040    protected static final Log log = LogFactory.getLog(HttpPreemptiveAuthInterceptor.class);
041
042    protected final AuthScheme authScheme;
043
044    HttpPreemptiveAuthInterceptor(AuthScheme authScheme) {
045        this.authScheme = authScheme;
046    }
047
048    @Override
049    public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
050        AuthState authState = (AuthState) context.getAttribute(ClientContext.TARGET_AUTH_STATE);
051        // If not auth scheme has been initialized yet
052        if (authState.getAuthScheme() != null) {
053            return;
054        }
055
056        // fetch credentials
057        CredentialsProvider credsProvider = (CredentialsProvider) context.getAttribute(ClientContext.CREDS_PROVIDER);
058        HttpHost targetHost = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);
059        AuthScope authScope = new AuthScope(targetHost.getHostName(), targetHost.getPort());
060
061        // Obtain credentials matching the target host
062        Credentials creds = credsProvider.getCredentials(authScope);
063
064        if (creds == null) {
065            log.warn("no credentials provided for " + authScope);
066            return;
067        }
068
069        authState.setAuthScheme(authScheme);
070        authState.setCredentials(creds);
071    }
072
073}