| /* |
| * 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.cassandra.auth; |
| |
| import java.util.Set; |
| |
| import com.google.common.base.Objects; |
| import com.google.common.collect.Sets; |
| import org.apache.commons.lang3.StringUtils; |
| |
| import org.apache.cassandra.config.Schema; |
| |
| /** |
| * The primary type of resource in Cassandra. |
| * |
| * Used to represent a table or a keyspace or the root level "data" resource. |
| * "data" - the root level data resource. |
| * "data/keyspace_name" - keyspace-level data resource. |
| * "data/keyspace_name/table_name" - table-level data resource. |
| */ |
| public class DataResource implements IResource |
| { |
| enum Level |
| { |
| ROOT, KEYSPACE, TABLE |
| } |
| |
| // permissions which may be granted on tables |
| private static final Set<Permission> TABLE_LEVEL_PERMISSIONS = Sets.immutableEnumSet(Permission.ALTER, |
| Permission.DROP, |
| Permission.SELECT, |
| Permission.MODIFY, |
| Permission.AUTHORIZE); |
| // permissions which may be granted on one or all keyspaces |
| private static final Set<Permission> KEYSPACE_LEVEL_PERMISSIONS = Sets.immutableEnumSet(Permission.CREATE, |
| Permission.ALTER, |
| Permission.DROP, |
| Permission.SELECT, |
| Permission.MODIFY, |
| Permission.AUTHORIZE); |
| private static final String ROOT_NAME = "data"; |
| private static final DataResource ROOT_RESOURCE = new DataResource(); |
| |
| private final Level level; |
| private final String keyspace; |
| private final String table; |
| |
| private DataResource() |
| { |
| level = Level.ROOT; |
| keyspace = null; |
| table = null; |
| } |
| |
| private DataResource(String keyspace) |
| { |
| level = Level.KEYSPACE; |
| this.keyspace = keyspace; |
| table = null; |
| } |
| |
| private DataResource(String keyspace, String table) |
| { |
| level = Level.TABLE; |
| this.keyspace = keyspace; |
| this.table = table; |
| } |
| |
| /** |
| * @return the root-level resource. |
| */ |
| public static DataResource root() |
| { |
| return ROOT_RESOURCE; |
| } |
| |
| /** |
| * Creates a DataResource representing a keyspace. |
| * |
| * @param keyspace Name of the keyspace. |
| * @return DataResource instance representing the keyspace. |
| */ |
| public static DataResource keyspace(String keyspace) |
| { |
| return new DataResource(keyspace); |
| } |
| |
| /** |
| * Creates a DataResource instance representing a table. |
| * |
| * @param keyspace Name of the keyspace. |
| * @param table Name of the table. |
| * @return DataResource instance representing the column family. |
| */ |
| public static DataResource table(String keyspace, String table) |
| { |
| return new DataResource(keyspace, table); |
| } |
| |
| /** |
| * Parses a data resource name into a DataResource instance. |
| * |
| * @param name Name of the data resource. |
| * @return DataResource instance matching the name. |
| */ |
| public static DataResource fromName(String name) |
| { |
| String[] parts = StringUtils.split(name, '/'); |
| |
| if (!parts[0].equals(ROOT_NAME) || parts.length > 3) |
| throw new IllegalArgumentException(String.format("%s is not a valid data resource name", name)); |
| |
| if (parts.length == 1) |
| return root(); |
| |
| if (parts.length == 2) |
| return keyspace(parts[1]); |
| |
| return table(parts[1], parts[2]); |
| } |
| |
| /** |
| * @return Printable name of the resource. |
| */ |
| public String getName() |
| { |
| switch (level) |
| { |
| case ROOT: |
| return ROOT_NAME; |
| case KEYSPACE: |
| return String.format("%s/%s", ROOT_NAME, keyspace); |
| case TABLE: |
| return String.format("%s/%s/%s", ROOT_NAME, keyspace, table); |
| } |
| throw new AssertionError(); |
| } |
| |
| /** |
| * @return Parent of the resource, if any. Throws IllegalStateException if it's the root-level resource. |
| */ |
| public IResource getParent() |
| { |
| switch (level) |
| { |
| case KEYSPACE: |
| return root(); |
| case TABLE: |
| return keyspace(keyspace); |
| } |
| throw new IllegalStateException("Root-level resource can't have a parent"); |
| } |
| |
| public boolean isRootLevel() |
| { |
| return level == Level.ROOT; |
| } |
| |
| public boolean isKeyspaceLevel() |
| { |
| return level == Level.KEYSPACE; |
| } |
| |
| public boolean isTableLevel() |
| { |
| return level == Level.TABLE; |
| } |
| /** |
| * @return keyspace of the resource. Throws IllegalStateException if it's the root-level resource. |
| */ |
| public String getKeyspace() |
| { |
| if (isRootLevel()) |
| throw new IllegalStateException("ROOT data resource has no keyspace"); |
| return keyspace; |
| } |
| |
| /** |
| * @return column family of the resource. Throws IllegalStateException if it's not a table-level resource. |
| */ |
| public String getTable() |
| { |
| if (!isTableLevel()) |
| throw new IllegalStateException(String.format("%s data resource has no table", level)); |
| return table; |
| } |
| |
| /** |
| * @return Whether or not the resource has a parent in the hierarchy. |
| */ |
| public boolean hasParent() |
| { |
| return level != Level.ROOT; |
| } |
| |
| /** |
| * @return Whether or not the resource exists in Cassandra. |
| */ |
| public boolean exists() |
| { |
| switch (level) |
| { |
| case ROOT: |
| return true; |
| case KEYSPACE: |
| return Schema.instance.getKeyspaces().contains(keyspace); |
| case TABLE: |
| return Schema.instance.getCFMetaData(keyspace, table) != null; |
| } |
| throw new AssertionError(); |
| } |
| |
| public Set<Permission> applicablePermissions() |
| { |
| switch (level) |
| { |
| case ROOT: |
| case KEYSPACE: |
| return KEYSPACE_LEVEL_PERMISSIONS; |
| case TABLE: |
| return TABLE_LEVEL_PERMISSIONS; |
| } |
| throw new AssertionError(); |
| } |
| |
| @Override |
| public String toString() |
| { |
| switch (level) |
| { |
| case ROOT: |
| return "<all keyspaces>"; |
| case KEYSPACE: |
| return String.format("<keyspace %s>", keyspace); |
| case TABLE: |
| return String.format("<table %s.%s>", keyspace, table); |
| } |
| throw new AssertionError(); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (this == o) |
| return true; |
| |
| if (!(o instanceof DataResource)) |
| return false; |
| |
| DataResource ds = (DataResource) o; |
| |
| return Objects.equal(level, ds.level) |
| && Objects.equal(keyspace, ds.keyspace) |
| && Objects.equal(table, ds.table); |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hashCode(level, keyspace, table); |
| } |
| } |