org.n52.oxf.util.web.BasicAuthenticationHttpClient.java Source code

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Here is the source code for org.n52.oxf.util.web.BasicAuthenticationHttpClient.java

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/**
 * Copyright (C) 2012-2015 52North Initiative for Geospatial Open Source
 * Software GmbH
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 2 as publishedby the Free
 * Software Foundation.
 *
 * If the program is linked with libraries which are licensed under one of the
 * following licenses, the combination of the program with the linked library is
 * not considered a "derivative work" of the program:
 *
 *     - Apache License, version 2.0
 *     - Apache Software License, version 1.0
 *     - GNU Lesser General Public License, version 3
 *     - Mozilla Public License, versions 1.0, 1.1 and 2.0
 *     - Common Development and Distribution License (CDDL), version 1.0
 *
 * Therefore the distribution of the program linked with libraries licensed under
 * the aforementioned licenses, is permitted by the copyright holders if the
 * distribution is compliant with both the GNU General Public License version 2
 * and the aforementioned licenses.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 */
package org.n52.oxf.util.web;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;

public class BasicAuthenticationHttpClient extends HttpClientDecorator {

    protected Map<HttpHost, UserPasswordAuthentication> credentials = new HashMap<HttpHost, UserPasswordAuthentication>();

    public BasicAuthenticationHttpClient(HttpClient toDecorate) {
        super(toDecorate);
        addAuthenticationInterceptor(getHttpClientToDecorate());
    }

    private void addAuthenticationInterceptor(DefaultHttpClient httpclient) {
        httpclient.addRequestInterceptor(getAuthenticationIntercepter(), 0);
    }

    protected HttpRequestInterceptor getAuthenticationIntercepter() {
        return new BasicAuthenticationInterceptor();
    }

    public synchronized void provideAuthentication(HttpHost host, String user, String pw) {
        this.credentials.put(host, new UserPasswordAuthentication(user, pw));
    }

    private final class BasicAuthenticationInterceptor implements HttpRequestInterceptor {

        public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
            HttpHost targetHost = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST);

            UserPasswordAuthentication creds;
            synchronized (this) {
                creds = credentials.get(targetHost);
            }

            if (creds != null) {
                AuthScope scope = new AuthScope(targetHost);

                BasicCredentialsProvider credProvider = new BasicCredentialsProvider();
                credProvider.setCredentials(scope,
                        new UsernamePasswordCredentials(creds.getUsername(), creds.getPassword()));
                context.setAttribute(ClientContext.CREDS_PROVIDER, credProvider);
            }
        }

    }

}