introduce UserWhiteListPlugin

Author: Vladimir Kotal

plugins/src/opengrok/auth/plugin/UserWhiteListPlugin.java

@@ -0,0 +1,91 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * See LICENSE.txt included in this distribution for the specific
+ * language governing permissions and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at LICENSE.txt.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 2019 Oracle and/or its affiliates. All rights reserved.
+ */
+
+package opengrok.auth.plugin;
+
+import opengrok.auth.plugin.entity.User;
+import org.opengrok.indexer.authorization.IAuthorizationPlugin;
+import org.opengrok.indexer.configuration.Group;
+import org.opengrok.indexer.configuration.Project;
+
+import javax.servlet.http.HttpServletRequest;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeSet;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import java.util.stream.Stream;
+
+public class UserWhiteListPlugin implements IAuthorizationPlugin {
+    private static final String className = UserWhiteListPlugin.class.getName();
+    private static final Logger LOGGER = Logger.getLogger(className);
+
+    private static final String FILE_PARAM = "file";
+
+    private final Set<String> whitelist = new TreeSet<>();
+
+    @Override
+    public void load(Map<String, Object> parameters) {
+        String filePath;
+
+        if ((filePath = (String) parameters.get(FILE_PARAM)) == null) {
+            throw new NullPointerException("Missing parameter [" + FILE_PARAM + "] in the configuration");
+        }
+
+        // Load whitelist from file to memory.
+        try (Stream<String> stream = Files.lines(Paths.get(filePath))) {
+            stream.forEach(whitelist::add);
+        } catch (IOException e) {
+            throw new IllegalArgumentException(String.format("Unable to read the file \"%s\"", filePath), e);
+        }
+    }
+
+    @Override
+    public void unload() {
+        whitelist.clear();
+    }
+
+    private boolean checkWhitelist(HttpServletRequest request) {
+        User user;
+        String attrName = UserPlugin.REQUEST_ATTR;
+        if ((user = (User) request.getAttribute(attrName)) == null) {
+            LOGGER.log(Level.WARNING, "cannot get {0} attribute", attrName);
+            return false;
+        }
+
+        return whitelist.contains(user.getUsername());
+    }
+
+    @Override
+    public boolean isAllowed(HttpServletRequest request, Project project) {
+        return checkWhitelist(request);
+    }
+
+    @Override
+    public boolean isAllowed(HttpServletRequest request, Group group) {
+        return checkWhitelist(request);
+    }
+}