com.ibm.watson.retrieveandrank.app.rest.UtilityFunctions.java Source code

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Here is the source code for com.ibm.watson.retrieveandrank.app.rest.UtilityFunctions.java

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/* Copyright IBM Corp. 2015
 *
 * 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.ibm.watson.retrieveandrank.app.rest;

import java.net.URI;

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.auth.Credentials;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.HttpCoreContext;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * A utility class for creating HTTP client builders and loggers etc..
 */
public final class UtilityFunctions {
    static Logger logger = LogManager.getLogger("watson.retrieve.and.rank.demo.logger"); //$NON-NLS-1$

    public static CloseableHttpClient createHTTPClient(URI uri, String username, String password) {
        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(new AuthScope(uri.getHost(), uri.getPort()),
                new UsernamePasswordCredentials(username, password));
        return HttpClientBuilder.create().setDefaultCredentialsProvider(credentialsProvider)
                .addInterceptorFirst(new PreemptiveAuthInterceptor()).build();
    }

    public static HttpClientBuilder createHTTPBuilder(URI uri, String username, String password) {
        final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(new AuthScope(uri.getHost(), uri.getPort()),
                new UsernamePasswordCredentials(username, password));

        final HttpClientBuilder builder = HttpClientBuilder.create().setMaxConnTotal(128).setMaxConnPerRoute(32)
                .setDefaultRequestConfig(
                        RequestConfig.copy(RequestConfig.DEFAULT).setRedirectsEnabled(true).build());
        builder.setDefaultCredentialsProvider(credentialsProvider);
        builder.addInterceptorFirst(new PreemptiveAuthInterceptor());
        return builder;
    }

    private static class PreemptiveAuthInterceptor implements HttpRequestInterceptor {

        @Override
        public void process(final HttpRequest request, final HttpContext context) throws HttpException {
            final AuthState authState = (AuthState) context.getAttribute(HttpClientContext.TARGET_AUTH_STATE);

            // If no auth scheme available yet, try to initialize it preemptively
            if (authState.getAuthScheme() == null) {
                final CredentialsProvider credsProvider = (CredentialsProvider) context
                        .getAttribute(HttpClientContext.CREDS_PROVIDER);
                final HttpHost targetHost = (HttpHost) context.getAttribute(HttpCoreContext.HTTP_TARGET_HOST);
                final Credentials creds = credsProvider
                        .getCredentials(new AuthScope(targetHost.getHostName(), targetHost.getPort()));
                if (creds == null) {
                    throw new HttpException("No credentials for preemptive authentication");
                }
                authState.update(new BasicScheme(), creds);
            }
        }
    }
}