2 * Copyright 2005 the original author or authors.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.wamblee.photos.model.authorization;
18 import java.io.IOException;
19 import java.io.InputStream;
20 import java.util.ArrayList;
21 import java.util.List;
22 import java.util.logging.Logger;
24 import javax.enterprise.context.SessionScoped;
25 import javax.inject.Inject;
26 import javax.servlet.http.HttpSession;
28 import org.wamblee.cache.Cache;
29 import org.wamblee.cache.CachedObject;
30 import org.wamblee.photos.model.Album;
31 import org.wamblee.photos.model.Path;
32 import org.wamblee.photos.model.Photo;
33 import org.wamblee.photos.model.PhotoEntry;
34 import org.wamblee.photos.model.plumbing.AllPhotos;
35 import org.wamblee.photos.model.plumbing.AuthorizedPhotos;
36 import org.wamblee.photos.model.plumbing.PhotoCache;
37 import org.wamblee.security.authorization.AllOperation;
38 import org.wamblee.security.authorization.AuthorizationService;
39 import org.wamblee.security.authorization.DeleteOperation;
40 import org.wamblee.security.authorization.ReadOperation;
41 import org.wamblee.security.authorization.WriteOperation;
44 * Decorator for an album providing defined behavior when used in a concurrent
49 public class AuthorizedAlbum extends AuthorizedPhotoEntry implements Album {
51 private static final Logger LOGGER = Logger.getLogger(AuthorizedAlbum.class
54 private AuthorizationService _authorizer;
56 private CachedObject<String, ArrayList<PhotoEntry>> _authorizedEntries;
58 private HttpSession _session;
60 protected AuthorizedAlbum() {
66 * Constructs concurrent album as a decorator for an album implementation.
72 public AuthorizedAlbum(@AllPhotos Album aAlbum,
73 AuthorizationService aService,
74 @PhotoCache Cache<String, ArrayList<PhotoEntry>> aCache,
75 HttpSession aSession) {
77 _authorizer = aService;
78 _authorizedEntries = new CachedObject<String, ArrayList<PhotoEntry>>(
79 aCache, aSession.getId() + "/" + aAlbum.getPath(),
80 new CachedObject.Computation<String, ArrayList<PhotoEntry>>() {
81 public ArrayList<PhotoEntry> getObject(String aObjectKey) {
82 return AuthorizedAlbum.this.compute();
89 * Computes the cache of photo entries to which read access is allowed.
91 * @return Photo entries to which read access is allowed.
93 private synchronized ArrayList<PhotoEntry> compute() {
94 LOGGER.info("Refreshing cache " + getPath());
95 ArrayList<PhotoEntry> result = new ArrayList<PhotoEntry>();
96 for (int i = 0; i < decorated().size(); i++) {
97 PhotoEntry entry = decorated().getEntry(i);
98 if (_authorizer.isAllowed(entry, new ReadOperation())) {
99 result.add(decorate(entry)); // subscription will take place
106 private Album decorated() {
107 return (Album) getEntry();
111 * Creates a decorate for the photo entry to make it safe for concurrent
116 * @return Decorated photo.
118 private <T extends PhotoEntry> T decorate(T aEntry) {
119 if (aEntry == null) {
121 } else if (aEntry instanceof Photo) {
122 return (T) new AuthorizedPhoto((Photo) aEntry);
123 } else if (aEntry instanceof Album) {
124 return (T) new AuthorizedAlbum((Album) aEntry, _authorizer,
125 _authorizedEntries.getCache(), _session);
127 throw new IllegalArgumentException(
128 "Entry is neither a photo nor an album: " + aEntry);
135 * @see org.wamblee.photos.model.Album#getEntry(java.lang.String)
137 public PhotoEntry getEntry(String aPath) {
138 return getEntry(new Path(aPath));
144 * @see org.wamblee.photos.model.Album#getEntry(org.wamblee.photos.model.Path)
146 public PhotoEntry getEntry(Path aPath) {
147 if (aPath.isRoot()) {
150 List<PhotoEntry> cache = _authorizedEntries.get();
151 String id = aPath.getPart(0);
152 Path remainder = aPath.remainder();
153 for (PhotoEntry entry : cache) {
154 if (entry.getId().equals(id)) {
155 if (remainder.isRoot()) {
158 if (!(entry instanceof Album)) {
159 throw new IllegalArgumentException(getPath() + " " +
162 return ((Album) entry).getEntry(remainder);
172 * @see org.wamblee.photos.model.Album#getEntry(int)
174 public PhotoEntry getEntry(int aIndex) {
175 return _authorizedEntries.get().get(aIndex);
181 * @see org.wamblee.photos.model.Album#size()
184 return _authorizedEntries.get().size();
190 * @see org.wamblee.photos.model.Album#addImage(java.lang.String,
191 * java.io.InputStream)
193 public void addImage(String aId, InputStream aImage) throws IOException {
194 _authorizer.check(this, new WriteOperation());
195 _authorizedEntries.invalidate();
196 decorated().addImage(aId, aImage);
202 * @see org.wamblee.photos.model.Album#addAlbum(java.lang.String)
204 public void addAlbum(String aId) throws IOException {
205 _authorizer.check(this, new WriteOperation());
206 _authorizedEntries.invalidate();
207 decorated().addAlbum(aId);
213 * @see org.wamblee.photos.model.Album#removeEntry(java.lang.String)
215 public void removeEntry(String aId) throws IOException {
216 // Check whether deletion is allowed.
217 PhotoEntry entry = _authorizer.check(decorated().getEntry("/" + aId),
218 new DeleteOperation());
219 _authorizedEntries.invalidate();
220 decorated().removeEntry(aId);
223 public Photo findPhotoBefore(String aId) {
224 Photo entry = decorated().findPhotoBefore(aId);
225 while (entry != null &&
226 !_authorizer.isAllowed(entry, new AllOperation())) {
227 entry = decorated().findPhotoBefore(entry.getId());
229 return decorate(entry);
232 public Photo findPhotoAfter(String aId) {
233 Photo entry = decorated().findPhotoAfter(aId);
234 while (entry != null &&
235 !_authorizer.isAllowed(entry, new AllOperation())) {
236 entry = decorated().findPhotoAfter(entry.getId());
238 return decorate(entry);
244 * @see java.lang.Object#toString()
247 public String toString() {
248 return "AuthorizedAlbum(path = '" + decorated().getPath() + "')";