HttpApiWithBasicAuth.java

package com.elphin.framework.util.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.AuthScope;
import org.apache.http.auth.AuthState;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpContext;

import java.io.IOException;

public class HttpApiWithBasicAuth extends AbstractHttpApi {

    private HttpRequestInterceptor preemptiveAuth = new HttpRequestInterceptor() {

        @Override
        public void process(final HttpRequest request, final HttpContext context)
                throws HttpException, IOException {

            AuthState authState = (AuthState) context
                    .getAttribute(ClientContext.TARGET_AUTH_STATE);
            CredentialsProvider credsProvider = (CredentialsProvider) context
                    .getAttribute(ClientContext.CREDS_PROVIDER);
            HttpHost targetHost = (HttpHost) context
                    .getAttribute(ExecutionContext.HTTP_TARGET_HOST);

            // If not auth scheme has been initialized yet
            if (authState.getAuthScheme() == null) {
                AuthScope authScope = new AuthScope(targetHost.getHostName(),
                        targetHost.getPort());
                // Obtain credentials matching the target host
                org.apache.http.auth.Credentials creds = credsProvider
                        .getCredentials(authScope);
                // If found, generate BasicScheme preemptively
                if (creds != null) {
                    authState.setAuthScheme(new BasicScheme());
                    authState.setCredentials(creds);
                }
            }
        }

    };

    public HttpApiWithBasicAuth(DefaultHttpClient httpClient,
            String clientVersion) {
        super(httpClient, clientVersion);
        httpClient.addRequestInterceptor(preemptiveAuth, 0);
    }
}