com.github.avarabyeu.restendpoint.http.PreemptiveAuthInterceptor.java Source code

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Here is the source code for com.github.avarabyeu.restendpoint.http.PreemptiveAuthInterceptor.java

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/*
 * Copyright (C) 2014 Andrei Varabyeu
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.github.avarabyeu.restendpoint.http;

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.AuthState;
import org.apache.http.client.AuthCache;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpCoreContext;

import java.io.IOException;

/**
 * Adds {@link org.apache.http.auth.AuthScheme} to all requests as
 * {@link org.apache.http.client.AuthCache} object. This way
 * we are able to force {@link org.apache.http.client.HttpClient} to use auth preemptively
 */
public class PreemptiveAuthInterceptor implements HttpRequestInterceptor {

    /**
     * Adds provided auth scheme to the client if there are no another provided
     * auth schemes
     */
    @Override
    public final void process(final HttpRequest request, final HttpContext context)
            throws HttpException, IOException {

        AuthState authState = (AuthState) context.getAttribute(HttpClientContext.TARGET_AUTH_STATE);
        if (authState.getAuthScheme() == null) {

            HttpHost targetHost = (HttpHost) context.getAttribute(HttpCoreContext.HTTP_TARGET_HOST);
            AuthCache authCache = new BasicAuthCache();
            authCache.put(targetHost, new BasicScheme());
            context.setAttribute(HttpClientContext.AUTH_CACHE, authCache);
        }
    }
}