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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
*/
package org.apache.hc.client5.http.impl;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.apache.hc.client5.http.AuthenticationStrategy;
import org.apache.hc.client5.http.auth.AuthChallenge;
import org.apache.hc.client5.http.auth.AuthScheme;
import org.apache.hc.client5.http.auth.AuthSchemeFactory;
import org.apache.hc.client5.http.auth.ChallengeType;
import org.apache.hc.client5.http.auth.StandardAuthScheme;
import org.apache.hc.client5.http.config.RequestConfig;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.config.Lookup;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Args;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Default implementation of {@link AuthenticationStrategy}
*
* @since 5.0
*/
@Contract(threading = ThreadingBehavior.STATELESS)
public class DefaultAuthenticationStrategy implements AuthenticationStrategy {
private static final Logger LOG = LoggerFactory.getLogger(DefaultAuthenticationStrategy.class);
/**
* Default instance of {@link DefaultAuthenticationStrategy}.
*/
public static final DefaultAuthenticationStrategy INSTANCE = new DefaultAuthenticationStrategy();
private static final List DEFAULT_SCHEME_PRIORITY =
Collections.unmodifiableList(Arrays.asList(
StandardAuthScheme.BEARER,
StandardAuthScheme.DIGEST,
StandardAuthScheme.BASIC));
@Override
public List select(
final ChallengeType challengeType,
final Map challenges,
final HttpContext context) {
Args.notNull(challengeType, "ChallengeType");
Args.notNull(challenges, "Map of auth challenges");
Args.notNull(context, "HTTP context");
final HttpClientContext clientContext = HttpClientContext.cast(context);
final String exchangeId = clientContext.getExchangeId();
final List options = new ArrayList<>();
final Lookup registry = clientContext.getAuthSchemeRegistry();
if (registry == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("{} Auth scheme registry not set in the context", exchangeId);
}
return options;
}
final RequestConfig config = clientContext.getRequestConfigOrDefault();
Collection authPrefs = challengeType == ChallengeType.TARGET ?
config.getTargetPreferredAuthSchemes() : config.getProxyPreferredAuthSchemes();
if (authPrefs == null) {
authPrefs = DEFAULT_SCHEME_PRIORITY;
}
if (LOG.isDebugEnabled()) {
LOG.debug("{} Authentication schemes in the order of preference: {}", exchangeId, authPrefs);
}
for (final String schemeName: authPrefs) {
final AuthChallenge challenge = challenges.get(schemeName.toLowerCase(Locale.ROOT));
if (challenge != null) {
final AuthSchemeFactory authSchemeFactory = registry.lookup(schemeName);
if (authSchemeFactory == null) {
if (LOG.isWarnEnabled()) {
LOG.warn("{} Authentication scheme {} not supported", exchangeId, schemeName);
// Try again
}
continue;
}
final AuthScheme authScheme = authSchemeFactory.create(context);
options.add(authScheme);
} else {
if (LOG.isDebugEnabled()) {
LOG.debug("{} Challenge for {} authentication scheme not available", exchangeId, schemeName);
}
}
}
return options;
}
}
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