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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.http.impl.auth;
import java.io.IOException;
import java.util.Locale;
import java.util.Map;
import java.util.Queue;
import org.apache.http.Header;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthOption;
import org.apache.http.auth.AuthProtocolState;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthState;
import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.ContextAwareAuthScheme;
import org.apache.http.auth.Credentials;
import org.apache.http.auth.MalformedChallengeException;
import org.apache.http.client.AuthenticationStrategy;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.Asserts;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
/**
* @since 4.3
*/
public class HttpAuthenticator {
private final Logger log;
public HttpAuthenticator(final Logger log) {
super();
this.log = log != null ? log : LogManager.getLogger(getClass());
}
public HttpAuthenticator() {
this(null);
}
public boolean isAuthenticationRequested(
final HttpHost host,
final HttpResponse response,
final AuthenticationStrategy authStrategy,
final AuthState authState,
final HttpContext context) {
if (authStrategy.isAuthenticationRequested(host, response, context)) {
this.log.debug("Authentication required");
if (authState.getState() == AuthProtocolState.SUCCESS) {
authStrategy.authFailed(host, authState.getAuthScheme(), context);
}
return true;
}
switch (authState.getState()) {
case CHALLENGED:
case HANDSHAKE:
this.log.debug("Authentication succeeded");
authState.setState(AuthProtocolState.SUCCESS);
authStrategy.authSucceeded(host, authState.getAuthScheme(), context);
break;
case SUCCESS:
break;
default:
authState.setState(AuthProtocolState.UNCHALLENGED);
}
return false;
}
public boolean handleAuthChallenge(
final HttpHost host,
final HttpResponse response,
final AuthenticationStrategy authStrategy,
final AuthState authState,
final HttpContext context) {
try {
if (this.log.isDebugEnabled()) {
this.log.debug(host.toHostString() + " requested authentication");
}
final Map challenges = authStrategy.getChallenges(host, response, context);
if (challenges.isEmpty()) {
this.log.debug("Response contains no authentication challenges");
return false;
}
final AuthScheme authScheme = authState.getAuthScheme();
switch (authState.getState()) {
case FAILURE:
return false;
case SUCCESS:
authState.reset();
break;
case CHALLENGED:
case HANDSHAKE:
if (authScheme == null) {
this.log.debug("Auth scheme is null");
authStrategy.authFailed(host, null, context);
authState.reset();
authState.setState(AuthProtocolState.FAILURE);
return false;
}
case UNCHALLENGED:
if (authScheme != null) {
final String id = authScheme.getSchemeName();
final Header challenge = challenges.get(id.toLowerCase(Locale.ROOT));
if (challenge != null) {
this.log.debug("Authorization challenge processed");
authScheme.processChallenge(challenge);
if (authScheme.isComplete()) {
this.log.debug("Authentication failed");
authStrategy.authFailed(host, authState.getAuthScheme(), context);
authState.reset();
authState.setState(AuthProtocolState.FAILURE);
return false;
}
authState.setState(AuthProtocolState.HANDSHAKE);
return true;
}
authState.reset();
// Retry authentication with a different scheme
}
}
final Queue authOptions = authStrategy.select(challenges, host, response, context);
if (authOptions != null && !authOptions.isEmpty()) {
if (this.log.isDebugEnabled()) {
this.log.debug("Selected authentication options: " + authOptions);
}
authState.setState(AuthProtocolState.CHALLENGED);
authState.update(authOptions);
return true;
}
return false;
} catch (final MalformedChallengeException ex) {
if (this.log.isWarnEnabled()) {
this.log.warn("Malformed challenge: " + ex.getMessage());
}
authState.reset();
return false;
}
}
public void generateAuthResponse(
final HttpRequest request,
final AuthState authState,
final HttpContext context) throws HttpException, IOException {
AuthScheme authScheme = authState.getAuthScheme();
Credentials creds = authState.getCredentials();
switch (authState.getState()) { // TODO add UNCHALLENGED and HANDSHAKE cases
case FAILURE:
return;
case SUCCESS:
ensureAuthScheme(authScheme);
if (authScheme.isConnectionBased()) {
return;
}
break;
case CHALLENGED:
final Queue authOptions = authState.getAuthOptions();
if (authOptions != null) {
while (!authOptions.isEmpty()) {
final AuthOption authOption = authOptions.remove();
authScheme = authOption.getAuthScheme();
creds = authOption.getCredentials();
authState.update(authScheme, creds);
if (this.log.isDebugEnabled()) {
this.log.debug("Generating response to an authentication challenge using "
+ authScheme.getSchemeName() + " scheme");
}
try {
final Header header = doAuth(authScheme, creds, request, context);
request.addHeader(header);
break;
} catch (final AuthenticationException ex) {
if (this.log.isWarnEnabled()) {
this.log.warn(authScheme + " authentication error: " + ex.getMessage());
}
}
}
return;
}
ensureAuthScheme(authScheme);
default:
break;
}
if (authScheme != null) {
try {
final Header header = doAuth(authScheme, creds, request, context);
request.addHeader(header);
} catch (final AuthenticationException ex) {
if (this.log.isErrorEnabled()) {
this.log.error(authScheme + " authentication error: " + ex.getMessage());
}
}
}
}
private void ensureAuthScheme(final AuthScheme authScheme) {
Asserts.notNull(authScheme, "Auth scheme");
}
@SuppressWarnings("deprecation")
private Header doAuth(
final AuthScheme authScheme,
final Credentials creds,
final HttpRequest request,
final HttpContext context) throws AuthenticationException {
return authScheme instanceof ContextAwareAuthScheme
? ((ContextAwareAuthScheme) authScheme).authenticate(creds, request,
context)
: authScheme.authenticate(creds, request);
}
}
