FsContent.java

   1 package org.argeo.cms.acr.fs;
   2
   3 import java.io.Closeable;
   4 import java.io.IOException;
   5 import java.io.InputStream;
   6 import java.io.OutputStream;
   7 import java.nio.ByteBuffer;
   8 import java.nio.charset.StandardCharsets;
   9 import java.nio.file.Files;
  10 import java.nio.file.Path;
  11 import java.nio.file.attribute.FileTime;
  12 import java.nio.file.attribute.UserDefinedFileAttributeView;
  13 import java.time.Instant;
  14 import java.util.Collections;
  15 import java.util.HashMap;
  16 import java.util.HashSet;
  17 import java.util.Iterator;
  18 import java.util.Map;
  19 import java.util.Optional;
  20 import java.util.Set;
  21
  22 import javax.xml.namespace.QName;
  23
  24 import org.argeo.api.acr.Content;
  25 import org.argeo.api.acr.ContentName;
  26 import org.argeo.api.acr.ContentResourceException;
  27 import org.argeo.api.acr.CrName;
  28 import org.argeo.api.acr.NamespaceUtils;
  29 import org.argeo.api.acr.spi.ContentProvider;
  30 import org.argeo.api.acr.spi.ProvidedContent;
  31 import org.argeo.api.acr.spi.ProvidedSession;
  32 import org.argeo.cms.acr.AbstractContent;
  33 import org.argeo.cms.acr.ContentUtils;
  34 import org.argeo.util.FsUtils;
  35
  36 public class FsContent extends AbstractContent implements ProvidedContent {
  37         final static String USER_ = "user:";
  38
  39         private static final Map<QName, String> BASIC_KEYS;
  40         private static final Map<QName, String> POSIX_KEYS;
  41         static {
  42                 BASIC_KEYS = new HashMap<>();
  43                 BASIC_KEYS.put(CrName.CREATION_TIME.get(), "basic:creationTime");
  44                 BASIC_KEYS.put(CrName.LAST_MODIFIED_TIME.get(), "basic:lastModifiedTime");
  45                 BASIC_KEYS.put(CrName.SIZE.get(), "basic:size");
  46                 BASIC_KEYS.put(CrName.FILE_KEY.get(), "basic:fileKey");
  47
  48                 POSIX_KEYS = new HashMap<>(BASIC_KEYS);
  49                 POSIX_KEYS.put(CrName.OWNER.get(), "owner:owner");
  50                 POSIX_KEYS.put(CrName.GROUP.get(), "posix:group");
  51                 POSIX_KEYS.put(CrName.PERMISSIONS.get(), "posix:permissions");
  52         }
  53
  54         private final ProvidedSession session;
  55         private final FsContentProvider provider;
  56         private final Path path;
  57         private final boolean isRoot;
  58         private final QName name;
  59
  60         protected FsContent(ProvidedSession session, FsContentProvider contentProvider, Path path) {
  61                 this.session = session;
  62                 this.provider = contentProvider;
  63                 this.path = path;
  64                 this.isRoot = contentProvider.isRoot(path);
  65                 // TODO check file names with ':' ?
  66                 if (isRoot) {
  67                         String mountPath = provider.getMountPath();
  68                         if (mountPath != null && !mountPath.equals("/")) {
  69                                 Content mountPoint = session.getMountPoint(mountPath);
  70                                 this.name = mountPoint.getName();
  71                         } else {
  72                                 this.name = CrName.ROOT.get();
  73                         }
  74                 } else {
  75                         QName providerName = NamespaceUtils.parsePrefixedName(provider, path.getFileName().toString());
  76                         this.name = new ContentName(providerName, session);
  77                 }
  78         }
  79
  80         protected FsContent(FsContent context, Path path) {
  81                 this(context.getSession(), context.getProvider(), path);
  82         }
  83
  84         private boolean isPosix() {
  85                 return path.getFileSystem().supportedFileAttributeViews().contains("posix");
  86         }
  87
  88         @Override
  89         public QName getName() {
  90                 return name;
  91         }
  92
  93         /*
  94          * ATTRIBUTES
  95          */
  96
  97         @Override
  98         public <A> Optional<A> get(QName key, Class<A> clss) {
  99                 Object value;
 100                 try {
 101                         // We need to add user: when accessing via Files#getAttribute
 102
 103                         if (POSIX_KEYS.containsKey(key)) {
 104                                 value = Files.getAttribute(path, toFsAttributeKey(key));
 105                         } else {
 106                                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path,
 107                                                 UserDefinedFileAttributeView.class);
 108                                 String prefixedName = NamespaceUtils.toPrefixedName(provider, key);
 109                                 if (!udfav.list().contains(prefixedName))
 110                                         return Optional.empty();
 111                                 ByteBuffer buf = ByteBuffer.allocate(udfav.size(prefixedName));
 112                                 udfav.read(prefixedName, buf);
 113                                 buf.flip();
 114                                 if (buf.hasArray())
 115                                         value = buf.array();
 116                                 else {
 117                                         byte[] arr = new byte[buf.remaining()];
 118                                         buf.get(arr);
 119                                         value = arr;
 120                                 }
 121                         }
 122                 } catch (IOException e) {
 123                         throw new ContentResourceException("Cannot retrieve attribute " + key + " for " + path, e);
 124                 }
 125                 A res = null;
 126                 if (value instanceof FileTime) {
 127                         if (clss.isAssignableFrom(FileTime.class))
 128                                 res = (A) value;
 129                         Instant instant = ((FileTime) value).toInstant();
 130                         if (Object.class.isAssignableFrom(clss)) {// plain object requested
 131                                 res = (A) instant;
 132                         }
 133                         // TODO perform trivial file conversion to other formats
 134                 }
 135                 if (value instanceof byte[]) {
 136                         res = (A) new String((byte[]) value, StandardCharsets.UTF_8);
 137                 }
 138                 if (res == null)
 139                         try {
 140                                 res = (A) value;
 141                         } catch (ClassCastException e) {
 142                                 return Optional.empty();
 143                         }
 144                 return Optional.of(res);
 145         }
 146
 147         @Override
 148         protected Iterable<QName> keys() {
 149                 Set<QName> result = new HashSet<>(isPosix() ? POSIX_KEYS.keySet() : BASIC_KEYS.keySet());
 150                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
 151                 if (udfav != null) {
 152                         try {
 153                                 for (String name : udfav.list()) {
 154                                         QName providerName = NamespaceUtils.parsePrefixedName(provider, name);
 155                                         QName sessionName = new ContentName(providerName, session);
 156                                         result.add(sessionName);
 157                                 }
 158                         } catch (IOException e) {
 159                                 throw new ContentResourceException("Cannot list attributes for " + path, e);
 160                         }
 161                 }
 162                 return result;
 163         }
 164
 165         @Override
 166         protected void removeAttr(QName key) {
 167                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
 168                 try {
 169                         udfav.delete(NamespaceUtils.toPrefixedName(provider, key));
 170                 } catch (IOException e) {
 171                         throw new ContentResourceException("Cannot delete attribute " + key + " for " + path, e);
 172                 }
 173         }
 174
 175         @Override
 176         public Object put(QName key, Object value) {
 177                 Object previous = get(key);
 178                 UserDefinedFileAttributeView udfav = Files.getFileAttributeView(path, UserDefinedFileAttributeView.class);
 179                 ByteBuffer bb = ByteBuffer.wrap(value.toString().getBytes(StandardCharsets.UTF_8));
 180                 try {
 181                         int size = udfav.write(NamespaceUtils.toPrefixedName(provider, key), bb);
 182                 } catch (IOException e) {
 183                         throw new ContentResourceException("Cannot delete attribute " + key + " for " + path, e);
 184                 }
 185                 return previous;
 186         }
 187
 188         protected String toFsAttributeKey(QName key) {
 189                 if (POSIX_KEYS.containsKey(key))
 190                         return POSIX_KEYS.get(key);
 191                 else
 192                         return USER_ + NamespaceUtils.toPrefixedName(provider, key);
 193         }
 194
 195         /*
 196          * CONTENT OPERATIONS
 197          */
 198         @Override
 199         public Iterator<Content> iterator() {
 200                 if (Files.isDirectory(path)) {
 201                         try {
 202                                 return Files.list(path).map((p) -> {
 203                                         FsContent fsContent = new FsContent(this, p);
 204                                         Optional<String> isMount = fsContent.get(CrName.MOUNT.get(), String.class);
 205                                         if (isMount.orElse("false").equals("true")) {
 206                                                 QName[] classes = null;
 207                                                 ContentProvider contentProvider = session.getRepository().getMountContentProvider(fsContent,
 208                                                                 false, classes);
 209                                                 Content mountedContent = contentProvider.get(session, fsContent.getPath(), "");
 210                                                 return mountedContent;
 211                                         } else {
 212                                                 return (Content) fsContent;
 213                                         }
 214                                 }).iterator();
 215                         } catch (IOException e) {
 216                                 throw new ContentResourceException("Cannot list " + path, e);
 217                         }
 218                 } else {
 219                         return Collections.emptyIterator();
 220                 }
 221         }
 222
 223         @Override
 224         public Content add(QName name, QName... classes) {
 225                 FsContent fsContent;
 226                 try {
 227                         Path newPath = path.resolve(NamespaceUtils.toPrefixedName(provider, name));
 228                         if (ContentName.contains(classes, CrName.COLLECTION.get()))
 229                                 Files.createDirectory(newPath);
 230                         else
 231                                 Files.createFile(newPath);
 232
 233 //              for(ContentClass clss:classes) {
 234 //                      Files.setAttribute(newPath, name, newPath, null)
 235 //              }
 236                         fsContent = new FsContent(this, newPath);
 237                 } catch (IOException e) {
 238                         throw new ContentResourceException("Cannot create new content", e);
 239                 }
 240
 241                 if (session.getRepository().shouldMount(classes)) {
 242                         ContentProvider contentProvider = session.getRepository().getMountContentProvider(fsContent, true, classes);
 243                         Content mountedContent = contentProvider.get(session, fsContent.getPath(), "");
 244                         fsContent.put(CrName.MOUNT.get(), "true");
 245                         return mountedContent;
 246
 247                 } else {
 248                         return fsContent;
 249                 }
 250         }
 251
 252         @Override
 253         public void remove() {
 254                 FsUtils.delete(path);
 255         }
 256
 257         @Override
 258         public Content getParent() {
 259                 if (isRoot) {
 260                         String mountPath = provider.getMountPath();
 261                         if (mountPath == null || mountPath.equals("/"))
 262                                 return null;
 263                         String[] parent = ContentUtils.getParentPath(mountPath);
 264                         return session.get(parent[0]);
 265                 }
 266                 return new FsContent(this, path.getParent());
 267         }
 268
 269         @Override
 270         public <C extends Closeable> C open(Class<C> clss) throws IOException, IllegalArgumentException {
 271                 if (InputStream.class.isAssignableFrom(clss)) {
 272                         if (Files.isDirectory(path))
 273                                 throw new UnsupportedOperationException("Cannot open " + path + " as stream, since it is a directory");
 274                         return (C) Files.newInputStream(path);
 275                 } else if (OutputStream.class.isAssignableFrom(clss)) {
 276                         if (Files.isDirectory(path))
 277                                 throw new UnsupportedOperationException("Cannot open " + path + " as stream, since it is a directory");
 278                         return (C) Files.newOutputStream(path);
 279                 }
 280                 return super.open(clss);
 281         }
 282
 283         /*
 284          * MOUNT MANAGEMENT
 285          */
 286         @Override
 287         public ProvidedContent getMountPoint(String relativePath) {
 288                 Path childPath = path.resolve(relativePath);
 289                 // TODO check that it is a mount
 290                 return new FsContent(this, childPath);
 291         }
 292
 293         /*
 294          * ACCESSORS
 295          */
 296         @Override
 297         public ProvidedSession getSession() {
 298                 return session;
 299         }
 300
 301         @Override
 302         public FsContentProvider getProvider() {
 303                 return provider;
 304         }
 305
 306 }