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Apache HttpComponents Client
/*
* ====================================================================
* 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
* DEFAULT_SCHEME_PRIORITY =
Collections.unmodifiableList(Arrays.asList(
AuthSchemes.SPNEGO,
AuthSchemes.KERBEROS,
AuthSchemes.NTLM,
AuthSchemes.DIGEST,
AuthSchemes.BASIC));
private final int challengeCode;
private final String headerName;
/**
* @param challengeCode for example SC_PROXY_AUTHENTICATION_REQUIRED or SC_UNAUTHORIZED
* @param headerName for example "Proxy-Authenticate" or "WWW-Authenticate"
*/
AuthenticationStrategyImpl(final int challengeCode, final String headerName) {
super();
this.challengeCode = challengeCode;
this.headerName = headerName;
}
@Override
public boolean isAuthenticationRequested(
final HttpHost authhost,
final HttpResponse response,
final HttpContext context) {
Args.notNull(response, "HTTP response");
final int status = response.getStatusLine().getStatusCode();
return status == this.challengeCode;
}
/**
* Generates a map of challenge auth-scheme => Header entries.
*
* @return map: key=lower-cased auth-scheme name, value=Header that contains the challenge
*/
@Override
public Map getChallenges(
final HttpHost authhost,
final HttpResponse response,
final HttpContext context) throws MalformedChallengeException {
Args.notNull(response, "HTTP response");
final Header[] headers = response.getHeaders(this.headerName);
final Map map = new HashMap(headers.length);
for (final Header header : headers) {
final CharArrayBuffer buffer;
int pos;
if (header instanceof FormattedHeader) {
buffer = ((FormattedHeader) header).getBuffer();
pos = ((FormattedHeader) header).getValuePos();
} else {
final String s = header.getValue();
if (s == null) {
throw new MalformedChallengeException("Header value is null");
}
buffer = new CharArrayBuffer(s.length());
buffer.append(s);
pos = 0;
}
while (pos < buffer.length() && HTTP.isWhitespace(buffer.charAt(pos))) {
pos++;
}
final int beginIndex = pos;
while (pos < buffer.length() && !HTTP.isWhitespace(buffer.charAt(pos))) {
pos++;
}
final int endIndex = pos;
final String s = buffer.substring(beginIndex, endIndex);
map.put(s.toLowerCase(Locale.ROOT), header);
}
return map;
}
abstract Collection getPreferredAuthSchemes(RequestConfig config);
@Override
public Queue select(
final Map challenges,
final HttpHost authhost,
final HttpResponse response,
final HttpContext context) throws MalformedChallengeException {
Args.notNull(challenges, "Map of auth challenges");
Args.notNull(authhost, "Host");
Args.notNull(response, "HTTP response");
Args.notNull(context, "HTTP context");
final HttpClientContext clientContext = HttpClientContext.adapt(context);
final Queue options = new LinkedList();
final Lookup registry = clientContext.getAuthSchemeRegistry();
if (registry == null) {
this.log.debug("Auth scheme registry not set in the context");
return options;
}
final CredentialsProvider credsProvider = clientContext.getCredentialsProvider();
if (credsProvider == null) {
this.log.debug("Credentials provider not set in the context");
return options;
}
final RequestConfig config = clientContext.getRequestConfig();
Collection authPrefs = getPreferredAuthSchemes(config);
if (authPrefs == null) {
authPrefs = DEFAULT_SCHEME_PRIORITY;
}
if (this.log.isDebugEnabled()) {
this.log.debug("Authentication schemes in the order of preference: " + authPrefs);
}
for (final String id: authPrefs) {
final Header challenge = challenges.get(id.toLowerCase(Locale.ROOT));
if (challenge != null) {
final AuthSchemeProvider authSchemeProvider = registry.lookup(id);
if (authSchemeProvider == null) {
if (this.log.isWarnEnabled()) {
this.log.warn("Authentication scheme " + id + " not supported");
// Try again
}
continue;
}
final AuthScheme authScheme = authSchemeProvider.create(context);
authScheme.processChallenge(challenge);
final AuthScope authScope = new AuthScope(
authhost.getHostName(),
authhost.getPort(),
authScheme.getRealm(),
authScheme.getSchemeName());
final Credentials credentials = credsProvider.getCredentials(authScope);
if (credentials != null) {
options.add(new AuthOption(authScheme, credentials));
}
} else {
if (this.log.isDebugEnabled()) {
this.log.debug("Challenge for " + id + " authentication scheme not available");
// Try again
}
}
}
return options;
}
@Override
public void authSucceeded(
final HttpHost authhost, final AuthScheme authScheme, final HttpContext context) {
Args.notNull(authhost, "Host");
Args.notNull(authScheme, "Auth scheme");
Args.notNull(context, "HTTP context");
final HttpClientContext clientContext = HttpClientContext.adapt(context);
if (isCachable(authScheme)) {
AuthCache authCache = clientContext.getAuthCache();
if (authCache == null) {
authCache = new BasicAuthCache();
clientContext.setAuthCache(authCache);
}
if (this.log.isDebugEnabled()) {
this.log.debug("Caching '" + authScheme.getSchemeName() +
"' auth scheme for " + authhost);
}
authCache.put(authhost, authScheme);
}
}
protected boolean isCachable(final AuthScheme authScheme) {
if (authScheme == null || !authScheme.isComplete()) {
return false;
}
final String schemeName = authScheme.getSchemeName();
return schemeName.equalsIgnoreCase(AuthSchemes.BASIC) ||
schemeName.equalsIgnoreCase(AuthSchemes.DIGEST);
}
@Override
public void authFailed(
final HttpHost authhost, final AuthScheme authScheme, final HttpContext context) {
Args.notNull(authhost, "Host");
Args.notNull(context, "HTTP context");
final HttpClientContext clientContext = HttpClientContext.adapt(context);
final AuthCache authCache = clientContext.getAuthCache();
if (authCache != null) {
if (this.log.isDebugEnabled()) {
this.log.debug("Clearing cached auth scheme for " + authhost);
}
authCache.remove(authhost);
}
}
}