natural commented on a change in pull request #3495: NIFI-5973 Adds ShellUserGroupProvider URL: https://github.com/apache/nifi/pull/3495#discussion_r291357191
########## File path: nifi-nar-bundles/nifi-framework-bundle/nifi-framework/nifi-shell-authorizer/src/main/java/org/apache/nifi/authorization/ShellUserGroupProvider.java ########## @@ -0,0 +1,367 @@ +/* + * 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. + */ +package org.apache.nifi.authorization; + +import org.apache.nifi.authorization.exception.AuthorizationAccessException; +import org.apache.nifi.authorization.exception.AuthorizerCreationException; +import org.apache.nifi.authorization.exception.AuthorizerDestructionException; +import org.apache.nifi.authorization.util.ShellRunner; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; + +import java.util.Arrays; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeUnit; + + +/* + * ShellUserGroupProvider implements UserGroupProvider by way of shell commands. + */ +public class ShellUserGroupProvider implements UserGroupProvider { + private final static Logger logger = LoggerFactory.getLogger(ShellUserGroupProvider.class); + + private final static String OS_TYPE_ERROR = "Unsupported operating system."; + private final static String SYS_CHECK_ERROR = "System check failed - cannot provide users and groups."; + private final Map<String, User> usersById = new HashMap<>(); // id == identifier + private final Map<String, User> usersByName = new HashMap<>(); // name == identity + private final Map<String, Group> groupsById = new HashMap<>(); + + // Our scheduler has one thread for users, one for groups: + private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2); + + // Our shell timeout, in seconds: + @SuppressWarnings("FieldCanBeLocal") + private final Integer shellTimeout = 10; + + // Commands selected during initialization: + private ShellCommandsProvider selectedShellCommands; + + // Start of the UserGroupProvider implementation. Docstrings + // copied from the interface definition for reference. + + /** + * Retrieves all users. Must be non null + * + * @return a list of users + * @throws AuthorizationAccessException if there was an unexpected error performing the operation + */ + @Override + public Set<User> getUsers() throws AuthorizationAccessException { + synchronized (usersById) { + logger.debug("getUsers has user set of size: " + usersById.size()); + return new HashSet<>(usersById.values()); + } + } + + /** + * Retrieves the user with the given identifier. + * + * @param identifier the id of the user to retrieve + * @return the user with the given id, or null if no matching user was found + * @throws AuthorizationAccessException if there was an unexpected error performing the operation + */ + @Override + public User getUser(String identifier) throws AuthorizationAccessException { + synchronized (usersById) { + User user = usersById.get(identifier); + if (user == null) { + logger.debug("getUser user not found: " + identifier); + } else { + logger.debug("getUser has user: " + user); + } + return user; + } + } + + /** + * Retrieves the user with the given identity. + * + * @param identity the identity of the user to retrieve + * @return the user with the given identity, or null if no matching user was found + * @throws AuthorizationAccessException if there was an unexpected error performing the operation + */ + @Override + public User getUserByIdentity(String identity) throws AuthorizationAccessException { + synchronized (usersByName) { + User user = usersByName.get(identity); + logger.debug("getUserByIdentity has user: " + user); + return user; + } + } + + /** + * Retrieves all groups. Must be non null + * + * @return a list of groups + * @throws AuthorizationAccessException if there was an unexpected error performing the operation + */ + @Override + public Set<Group> getGroups() throws AuthorizationAccessException { + synchronized (groupsById) { + logger.debug("getGroups has group set of size: " + groupsById.size()); + return new HashSet<>(groupsById.values()); + } + } + + /** + * Retrieves a Group by id. + * + * @param identifier the identifier of the Group to retrieve + * @return the Group with the given identifier, or null if no matching group was found + * @throws AuthorizationAccessException if there was an unexpected error performing the operation + */ + @Override + public Group getGroup(String identifier) throws AuthorizationAccessException { + synchronized (groupsById) { + Group group = groupsById.get(identifier); + logger.debug("getGroup has group: " + group); + return group; + } + } + + /** + * Gets a user and their groups. Must be non null. If the user is not known the UserAndGroups.getUser() and + * UserAndGroups.getGroups() should return null + * + * @return the UserAndGroups for the specified identity + * @throws AuthorizationAccessException if there was an unexpected error performing the operation + */ + @Override + public UserAndGroups getUserAndGroups(String identity) throws AuthorizationAccessException { + User user = getUser(identity); + Set<Group> groups = new HashSet<>(); + + for (Group g: getGroups()) { + if (user != null && g.getUsers().contains(user.getIdentity())) { + groups.add(g); + } + } + + return new UserAndGroups() { + @Override + public User getUser() { + return user; + } + + @Override + public Set<Group> getGroups() { + return groups; + } + }; + } + + /** + * Called immediately after instance creation for implementers to perform additional setup + * + * @param initializationContext in which to initialize + */ + @Override + public void initialize(UserGroupProviderInitializationContext initializationContext) throws AuthorizerCreationException { + } + + /** + * Called to configure the Authorizer. + * + * @param configurationContext at the time of configuration + * @throws AuthorizerCreationException for any issues configuring the provider + */ + @Override + public void onConfigured(AuthorizerConfigurationContext configurationContext) throws AuthorizerCreationException { + // Our first init step is to select the command set based on the + // operating system name: + final String osName = System.getProperty("os.name"); + ShellCommandsProvider commands = getCommandsProvider(); + + if (commands == null) { Review comment: Extracted into a static utility method. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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