HTTPCLIENT-1303: support for java.net.Authenticator backed crednetials provider

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1483846 13f79535-47bb-0310-9956-ffa450edef68

httpclient/src/main/java/org/apache/http/impl/client/HttpClientBuilder.java

@@ -542,7 +542,8 @@ public CloseableHttpClient build() {
             if (userAgent == null) {
                 if (systemProperties) {
                     userAgent = System.getProperty("http.agent");
-                } else {
+                }
+                if (userAgent == null) {
                     final VersionInfo vi = VersionInfo.loadVersionInfo("org.apache.http.client",
                             HttpClientBuilder.class.getClassLoader());
                     final String release = vi != null ? vi.getRelease() : VersionInfo.UNAVAILABLE;
@@ -669,7 +670,11 @@ public CloseableHttpClient build() {
 
         CredentialsProvider defaultCredentialsProvider = this.credentialsProvider;
         if (defaultCredentialsProvider == null) {
-            defaultCredentialsProvider = new BasicCredentialsProvider();
+            if (systemProperties) {
+                defaultCredentialsProvider = new SystemDefaultCredentialsProvider();
+            } else {
+                defaultCredentialsProvider = new BasicCredentialsProvider();
+            }
         }
 
         return new InternalHttpClient(

httpclient/src/main/java/org/apache/http/impl/client/SystemDefaultCredentialsProvider.java

@@ -0,0 +1,110 @@
+/*
+ * ====================================================================
+ * 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
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.http.impl.client;
+
+import java.net.Authenticator;
+import java.net.PasswordAuthentication;
+import java.util.Locale;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.http.annotation.ThreadSafe;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.Credentials;
+import org.apache.http.auth.UsernamePasswordCredentials;
+import org.apache.http.client.CredentialsProvider;
+import org.apache.http.client.config.AuthSchemes;
+import org.apache.http.util.Args;
+
+/**
+ * Implementation of {@link CredentialsProvider} backed by system {@link Authenticator}.
+ *
+ * @since 4.3
+ */
+@ThreadSafe
+public class SystemDefaultCredentialsProvider implements CredentialsProvider {
+
+    private static Map<String, String> SCHEME_MAP;
+
+    static {
+        SCHEME_MAP = new ConcurrentHashMap<String, String>();
+        SCHEME_MAP.put(AuthSchemes.BASIC.toUpperCase(Locale.ENGLISH), "Basic");
+        SCHEME_MAP.put(AuthSchemes.DIGEST.toUpperCase(Locale.ENGLISH), "Digest");
+        SCHEME_MAP.put(AuthSchemes.NTLM.toUpperCase(Locale.ENGLISH), "NTLM");
+        SCHEME_MAP.put(AuthSchemes.SPNEGO.toUpperCase(Locale.ENGLISH), "SPNEGO");
+        SCHEME_MAP.put(AuthSchemes.KERBEROS.toUpperCase(Locale.ENGLISH), "Kerberos");
+    }
+
+    private static String translateScheme(final String key) {
+        if (key == null) {
+            return null;
+        }
+        final String s = SCHEME_MAP.get(key);
+        return s != null ? s : key;
+    }
+
+    private final BasicCredentialsProvider internal;
+
+    /**
+     * Default constructor.
+     */
+    public SystemDefaultCredentialsProvider() {
+        super();
+        this.internal = new BasicCredentialsProvider();
+    }
+
+    public void setCredentials(final AuthScope authscope, final Credentials credentials) {
+        internal.setCredentials(authscope, credentials);
+    }
+
+    public Credentials getCredentials(final AuthScope authscope) {
+        Args.notNull(authscope, "Auth scope");
+        final Credentials localcreds = internal.getCredentials(authscope);
+        if (localcreds != null) {
+            return localcreds;
+        }
+        if (authscope.getHost() != null) {
+            final PasswordAuthentication systemcreds = Authenticator.requestPasswordAuthentication(
+                    authscope.getHost(),
+                    null,
+                    authscope.getPort(),
+                    "http",
+                    null,
+                    translateScheme(authscope.getScheme()));
+            if (systemcreds != null) {
+                return new UsernamePasswordCredentials(
+                        systemcreds.getUserName(), new String(systemcreds.getPassword()));
+            }
+        }
+        return null;
+    }
+
+    public void clear() {
+        internal.clear();
+    }
+
+}