src/com/owncloud/android/operations/SynchronizeFolderOperation.java

   1 /* ownCloud Android client application
   2  *   Copyright (C) 2012-2013 ownCloud Inc.
   3  *
   4  *   This program is free software: you can redistribute it and/or modify
   5  *   it under the terms of the GNU General Public License version 2,
   6  *   as published by the Free Software Foundation.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  *
  13  *   You should have received a copy of the GNU General Public License
  14  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  *
  16  */
  17
  18 package com.owncloud.android.operations;
  19
  20 import java.io.File;
  21 import java.io.FileInputStream;
  22 import java.io.FileOutputStream;
  23 import java.io.IOException;
  24 import java.io.InputStream;
  25 import java.io.OutputStream;
  26 import java.util.HashMap;
  27 import java.util.List;
  28 import java.util.Map;
  29 import java.util.Vector;
  30
  31 import org.apache.http.HttpStatus;
  32 import org.apache.jackrabbit.webdav.MultiStatus;
  33 import org.apache.jackrabbit.webdav.client.methods.PropFindMethod;
  34
  35 import android.accounts.Account;
  36 import android.content.Context;
  37 import android.content.Intent;
  38
  39 import com.owncloud.android.Log_OC;
  40 import com.owncloud.android.datamodel.DataStorageManager;
  41 import com.owncloud.android.datamodel.OCFile;
  42 import com.owncloud.android.operations.RemoteOperationResult.ResultCode;
  43 import com.owncloud.android.syncadapter.FileSyncService;
  44 import com.owncloud.android.utils.FileStorageUtils;
  45
  46 import eu.alefzero.webdav.WebdavClient;
  47 import eu.alefzero.webdav.WebdavEntry;
  48 import eu.alefzero.webdav.WebdavUtils;
  49
  50
  51 /**
  52  *  Remote operation performing the synchronization of the list of files contained
  53  *  in a folder identified with its remote path.
  54  *
  55  *  Fetches the list and properties of the files contained in the given folder, including their
  56  *  properties, and updates the local database with them.
  57  *
  58  *  Does NOT enter in the child folders to synchronize their contents also.
  59  *
  60  *  @author David A. Velasco
  61  */
  62 public class SynchronizeFolderOperation extends RemoteOperation {
  63
  64     private static final String TAG = SynchronizeFolderOperation.class.getSimpleName();
  65
  66
  67     /** Time stamp for the synchronization process in progress */
  68     private long mCurrentSyncTime;
  69
  70     /** Remote folder to synchronize */
  71     private OCFile mLocalFolder;
  72
  73     /** 'True' means that the properties of the folder should be updated also, not just its content */
  74     private boolean mUpdateFolderProperties;
  75
  76     /** Access to the local database */
  77     private DataStorageManager mStorageManager;
  78
  79     /** Account where the file to synchronize belongs */
  80     private Account mAccount;
  81
  82     /** Android context; necessary to send requests to the download service */
  83     private Context mContext;
  84
  85     /** Files and folders contained in the synchronized folder after a successful operation */
  86     private List<OCFile> mChildren;
  87
  88     /** Counter of conflicts found between local and remote files */
  89     private int mConflictsFound;
  90
  91     /** Counter of failed operations in synchronization of kept-in-sync files */
  92     private int mFailsInFavouritesFound;
  93
  94     /** Map of remote and local paths to files that where locally stored in a location out of the ownCloud folder and couldn't be copied automatically into it */
  95     private Map<String, String> mForgottenLocalFiles;
  96
  97     /** 'True' means that this operation is part of a full account synchronization */
  98     private boolean mSyncFullAccount;
  99
 100
 101     /**
 102      * Creates a new instance of {@link SynchronizeFolderOperation}.
 103      *
 104      * @param   remoteFolderPath        Remote folder to synchronize.
 105      * @param   currentSyncTime         Time stamp for the synchronization process in progress.
 106      * @param   localFolderId           Identifier in the local database of the folder to synchronize.
 107      * @param   updateFolderProperties  'True' means that the properties of the folder should be updated also, not just its content.
 108      * @param   syncFullAccount         'True' means that this operation is part of a full account synchronization.
 109      * @param   dataStorageManager      Interface with the local database.
 110      * @param   account                 ownCloud account where the folder is located.
 111      * @param   context                 Application context.
 112      */
 113     public SynchronizeFolderOperation(  OCFile folder,
 114                                         long currentSyncTime,
 115                                         boolean updateFolderProperties,
 116                                         boolean syncFullAccount,
 117                                         DataStorageManager dataStorageManager,
 118                                         Account account,
 119                                         Context context ) {
 120         mLocalFolder = folder;
 121         mCurrentSyncTime = currentSyncTime;
 122         mUpdateFolderProperties = updateFolderProperties;
 123         mSyncFullAccount = syncFullAccount;
 124         mStorageManager = dataStorageManager;
 125         mAccount = account;
 126         mContext = context;
 127         mForgottenLocalFiles = new HashMap<String, String>();
 128     }
 129
 130
 131     public int getConflictsFound() {
 132         return mConflictsFound;
 133     }
 134
 135     public int getFailsInFavouritesFound() {
 136         return mFailsInFavouritesFound;
 137     }
 138
 139     public Map<String, String> getForgottenLocalFiles() {
 140         return mForgottenLocalFiles;
 141     }
 142
 143     /**
 144      * Returns the list of files and folders contained in the synchronized folder, if called after synchronization is complete.
 145      *
 146      * @return  List of files and folders contained in the synchronized folder.
 147      */
 148     public List<OCFile> getChildren() {
 149         return mChildren;
 150     }
 151
 152     /**
 153      * Performs the synchronization.
 154      *
 155      * {@inheritDoc}
 156      */
 157     @Override
 158     protected RemoteOperationResult run(WebdavClient client) {
 159         RemoteOperationResult result = null;
 160         mFailsInFavouritesFound = 0;
 161         mConflictsFound = 0;
 162         mForgottenLocalFiles.clear();
 163         String remotePath = null;
 164         PropFindMethod query = null;
 165         try {
 166             remotePath = mLocalFolder.getRemotePath();
 167             Log_OC.d(TAG, "Synchronizing " + mAccount.name + remotePath);
 168
 169             // remote request
 170             query = new PropFindMethod(client.getBaseUri() + WebdavUtils.encodePath(remotePath));
 171             int status = client.executeMethod(query);
 172
 173             // check and process response
 174             if (isMultiStatus(status)) {
 175                 boolean folderChanged = synchronizeData(query.getResponseBodyAsMultiStatus(), client);
 176                 if (folderChanged) {
 177                     if (mConflictsFound > 0  || mFailsInFavouritesFound > 0) {
 178                         result = new RemoteOperationResult(ResultCode.SYNC_CONFLICT);   // should be different result, but will do the job
 179                     } else {
 180                         result = new RemoteOperationResult(true, status, query.getResponseHeaders());
 181                     }
 182                 } else {
 183                     result = new RemoteOperationResult(ResultCode.OK_NO_CHANGES_ON_DIR);
 184                 }
 185
 186             } else {
 187                 // synchronization failed
 188                 client.exhaustResponse(query.getResponseBodyAsStream());
 189                 if (status == HttpStatus.SC_NOT_FOUND) {
 190                     if (mStorageManager.fileExists(mLocalFolder.getFileId())) {
 191                         String currentSavePath = FileStorageUtils.getSavePath(mAccount.name);
 192                         mStorageManager.removeDirectory(mLocalFolder, true, (mLocalFolder.isDown() && mLocalFolder.getStoragePath().startsWith(currentSavePath)));
 193                     }
 194                 }
 195                 result = new RemoteOperationResult(false, status, query.getResponseHeaders());
 196             }
 197
 198         } catch (Exception e) {
 199             result = new RemoteOperationResult(e);
 200
 201
 202         } finally {
 203             if (query != null)
 204                 query.releaseConnection();  // let the connection available for other methods
 205             if (result.isSuccess()) {
 206                 Log_OC.i(TAG, "Synchronized " + mAccount.name + remotePath + ": " + result.getLogMessage());
 207             } else {
 208                 if (result.isException()) {
 209                     Log_OC.e(TAG, "Synchronized " + mAccount.name + remotePath  + ": " + result.getLogMessage(), result.getException());
 210                 } else {
 211                     Log_OC.e(TAG, "Synchronized " + mAccount.name + remotePath + ": " + result.getLogMessage());
 212                 }
 213             }
 214
 215             if (!mSyncFullAccount) {
 216                 sendStickyBroadcast(false, remotePath, result);
 217             }
 218         }
 219
 220         return result;
 221     }
 222
 223
 224     /**
 225      *  Synchronizes the data retrieved from the server about the contents of the target folder
 226      *  with the current data in the local database.
 227      *
 228      *  Grants that mChildren is updated with fresh data after execution.
 229      *
 230      *  @param dataInServer     Full response got from the server with the data of the target
 231      *                          folder and its direct children.
 232      *  @param client           Client instance to the remote server where the data were
 233      *                          retrieved.
 234      *  @return                 'True' when any change was made in the local data, 'false' otherwise.
 235      */
 236     private boolean synchronizeData(MultiStatus dataInServer, WebdavClient client) {
 237         // get 'fresh data' from the database
 238         mLocalFolder = mStorageManager.getFileById(mLocalFolder.getFileId());
 239
 240         // parse data from remote folder
 241         WebdavEntry we = new WebdavEntry(dataInServer.getResponses()[0], client.getBaseUri().getPath());
 242         OCFile remoteFolder = fillOCFile(we);
 243         remoteFolder.setParentId(mLocalFolder.getParentId());
 244         remoteFolder.setFileId(mLocalFolder.getFileId());
 245
 246         // check if remote and local folder are different
 247         boolean folderChanged = !(remoteFolder.getEtag().equalsIgnoreCase(mLocalFolder.getEtag()));
 248
 249         if (!folderChanged) {
 250             if (mUpdateFolderProperties) {  // TODO check if this is really necessary
 251                 mStorageManager.saveFile(remoteFolder);
 252             }
 253
 254             mChildren = mStorageManager.getDirectoryContent(mLocalFolder);
 255
 256         } else {
 257             // read info of folder contents
 258             List<OCFile> updatedFiles = new Vector<OCFile>(dataInServer.getResponses().length - 1);
 259             List<SynchronizeFileOperation> filesToSyncContents = new Vector<SynchronizeFileOperation>();
 260
 261             // loop to update every child
 262             OCFile remoteFile = null, localFile = null;
 263             for (int i = 1; i < dataInServer.getResponses().length; ++i) {
 264                 /// new OCFile instance with the data from the server
 265                 we = new WebdavEntry(dataInServer.getResponses()[i], client.getBaseUri().getPath());
 266                 remoteFile = fillOCFile(we);
 267                 remoteFile.setParentId(mLocalFolder.getFileId());
 268
 269                 /// retrieve local data for the read file
 270                 localFile = mStorageManager.getFileByPath(remoteFile.getRemotePath());
 271
 272                 /// add to the remoteFile (the new one) data about LOCAL STATE (not existing in the server side)
 273                 remoteFile.setLastSyncDateForProperties(mCurrentSyncTime);
 274                 if (localFile != null) {
 275                     // properties of local state are kept unmodified
 276                     remoteFile.setKeepInSync(localFile.keepInSync());
 277                     remoteFile.setLastSyncDateForData(localFile.getLastSyncDateForData());
 278                     remoteFile.setModificationTimestampAtLastSyncForData(localFile.getModificationTimestampAtLastSyncForData());
 279                     remoteFile.setStoragePath(localFile.getStoragePath());
 280                     remoteFile.setEtag(localFile.getEtag());    // eTag will not be updated unless contents are synchronized (Synchronize[File|Folder]Operation with remoteFile as parameter)
 281                 } else {
 282                     remoteFile.setEtag(""); // remote eTag will not be updated unless contents are synchronized (Synchronize[File|Folder]Operation with remoteFile as parameter)
 283                 }
 284
 285                 /// check and fix, if need, local storage path
 286                 checkAndFixForeignStoragePath(remoteFile);      // fixing old policy - now local files must be copied into the ownCloud local folder
 287                 searchForLocalFileInDefaultPath(remoteFile);    // legacy
 288
 289                 /// prepare content synchronization for kept-in-sync files
 290                 if (remoteFile.keepInSync()) {
 291                     SynchronizeFileOperation operation = new SynchronizeFileOperation(  localFile,
 292                                                                                         remoteFile,
 293                                                                                         mStorageManager,
 294                                                                                         mAccount,
 295                                                                                         true,
 296                                                                                         false,
 297                                                                                         mContext
 298                                                                                         );
 299                     filesToSyncContents.add(operation);
 300                 }
 301
 302                 updatedFiles.add(remoteFile);
 303             }
 304
 305             // save updated contents in local database; all at once, trying to get a best performance in database update (not a big deal, indeed)
 306             mStorageManager.saveFiles(updatedFiles);
 307
 308             // request for the synchronization of file contents AFTER saving current remote properties
 309             startContentSynchronizations(filesToSyncContents, client);
 310
 311             // removal of obsolete files
 312             removeObsoleteFiles();
 313
 314             // must be done AFTER saving all the children information, so that eTag is not updated in the database in case of unexpected exceptions
 315             mStorageManager.saveFile(remoteFolder);
 316
 317         }
 318
 319         return folderChanged;
 320
 321     }
 322
 323
 324     /**
 325      *  Removes obsolete children in the folder after saving all the new data.
 326      */
 327     private void removeObsoleteFiles() {
 328         mChildren = mStorageManager.getDirectoryContent(mLocalFolder);
 329         OCFile file;
 330         for (int i=0; i < mChildren.size(); ) {
 331             file = mChildren.get(i);
 332             if (file.getLastSyncDateForProperties() != mCurrentSyncTime) {
 333                 if (file.isDirectory()) {
 334                     Log_OC.d(TAG, "removing folder: " + file);
 335                     mStorageManager.removeDirectory(file, true, true);
 336                 } else {
 337                     Log_OC.d(TAG, "removing file: " + file);
 338                     mStorageManager.removeFile(file, true);
 339                 }
 340                 mChildren.remove(i);
 341             } else {
 342                 i++;
 343             }
 344         }
 345     }
 346
 347
 348     /**
 349      * Performs a list of synchronization operations, determining if a download or upload is needed or
 350      * if exists conflict due to changes both in local and remote contents of the each file.
 351      *
 352      * If download or upload is needed, request the operation to the corresponding service and goes on.
 353      *
 354      * @param filesToSyncContents       Synchronization operations to execute.
 355      * @param client                    Interface to the remote ownCloud server.
 356      */
 357     private void startContentSynchronizations(List<SynchronizeFileOperation> filesToSyncContents, WebdavClient client) {
 358         RemoteOperationResult contentsResult = null;
 359         for (SynchronizeFileOperation op: filesToSyncContents) {
 360             contentsResult = op.execute(client);   // returns without waiting for upload or download finishes
 361             if (!contentsResult.isSuccess()) {
 362                 if (contentsResult.getCode() == ResultCode.SYNC_CONFLICT) {
 363                     mConflictsFound++;
 364                 } else {
 365                     mFailsInFavouritesFound++;
 366                     if (contentsResult.getException() != null) {
 367                         Log_OC.e(TAG, "Error while synchronizing favourites : " +  contentsResult.getLogMessage(), contentsResult.getException());
 368                     } else {
 369                         Log_OC.e(TAG, "Error while synchronizing favourites : " + contentsResult.getLogMessage());
 370                     }
 371                 }
 372             }   // won't let these fails break the synchronization process
 373         }
 374     }
 375
 376
 377     public boolean isMultiStatus(int status) {
 378         return (status == HttpStatus.SC_MULTI_STATUS);
 379     }
 380
 381
 382     /**
 383      * Creates and populates a new {@link OCFile} object with the data read from the server.
 384      *
 385      * @param we        WebDAV entry read from the server for a WebDAV resource (remote file or folder).
 386      * @return          New OCFile instance representing the remote resource described by we.
 387      */
 388     private OCFile fillOCFile(WebdavEntry we) {
 389         OCFile file = new OCFile(we.decodedPath());
 390         file.setCreationTimestamp(we.createTimestamp());
 391         file.setFileLength(we.contentLength());
 392         file.setMimetype(we.contentType());
 393         file.setModificationTimestamp(we.modifiedTimestamp());
 394         file.setEtag(we.etag());
 395         return file;
 396     }
 397
 398
 399     /**
 400      * Checks the storage path of the OCFile received as parameter. If it's out of the local ownCloud folder,
 401      * tries to copy the file inside it.
 402      *
 403      * If the copy fails, the link to the local file is nullified. The account of forgotten files is kept in
 404      * {@link #mForgottenLocalFiles}
 405      *)
 406      * @param file      File to check and fix.
 407      */
 408     private void checkAndFixForeignStoragePath(OCFile file) {
 409         String storagePath = file.getStoragePath();
 410         String expectedPath = FileStorageUtils.getDefaultSavePathFor(mAccount.name, file);
 411         if (storagePath != null && !storagePath.equals(expectedPath)) {
 412             /// fix storagePaths out of the local ownCloud folder
 413             File originalFile = new File(storagePath);
 414             if (FileStorageUtils.getUsableSpace(mAccount.name) < originalFile.length()) {
 415                 mForgottenLocalFiles.put(file.getRemotePath(), storagePath);
 416                 file.setStoragePath(null);
 417
 418             } else {
 419                 InputStream in = null;
 420                 OutputStream out = null;
 421                 try {
 422                     File expectedFile = new File(expectedPath);
 423                     File expectedParent = expectedFile.getParentFile();
 424                     expectedParent.mkdirs();
 425                     if (!expectedParent.isDirectory()) {
 426                         throw new IOException("Unexpected error: parent directory could not be created");
 427                     }
 428                     expectedFile.createNewFile();
 429                     if (!expectedFile.isFile()) {
 430                         throw new IOException("Unexpected error: target file could not be created");
 431                     }
 432                     in = new FileInputStream(originalFile);
 433                     out = new FileOutputStream(expectedFile);
 434                     byte[] buf = new byte[1024];
 435                     int len;
 436                     while ((len = in.read(buf)) > 0){
 437                         out.write(buf, 0, len);
 438                     }
 439                     file.setStoragePath(expectedPath);
 440
 441                 } catch (Exception e) {
 442                     Log_OC.e(TAG, "Exception while copying foreign file " + expectedPath, e);
 443                     mForgottenLocalFiles.put(file.getRemotePath(), storagePath);
 444                     file.setStoragePath(null);
 445
 446                 } finally {
 447                     try {
 448                         if (in != null) in.close();
 449                     } catch (Exception e) {
 450                         Log_OC.d(TAG, "Weird exception while closing input stream for " + storagePath + " (ignoring)", e);
 451                     }
 452                     try {
 453                         if (out != null) out.close();
 454                     } catch (Exception e) {
 455                         Log_OC.d(TAG, "Weird exception while closing output stream for " + expectedPath + " (ignoring)", e);
 456                     }
 457                 }
 458             }
 459         }
 460     }
 461
 462
 463     /**
 464      * Scans the default location for saving local copies of files searching for
 465      * a 'lost' file with the same full name as the {@link OCFile} received as
 466      * parameter.
 467      *
 468      * @param file      File to associate a possible 'lost' local file.
 469      */
 470     private void searchForLocalFileInDefaultPath(OCFile file) {
 471         if (file.getStoragePath() == null && !file.isDirectory()) {
 472             File f = new File(FileStorageUtils.getDefaultSavePathFor(mAccount.name, file));
 473             if (f.exists()) {
 474                 file.setStoragePath(f.getAbsolutePath());
 475                 file.setLastSyncDateForData(f.lastModified());
 476             }
 477         }
 478     }
 479
 480
 481     /**
 482      * Sends a message to any application component interested in the progress of the synchronization.
 483      *
 484      * @param inProgress        'True' when the synchronization progress is not finished.
 485      * @param dirRemotePath     Remote path of a folder that was just synchronized (with or without success)
 486      */
 487     private void sendStickyBroadcast(boolean inProgress, String dirRemotePath, RemoteOperationResult result) {
 488         Intent i = new Intent(FileSyncService.SYNC_MESSAGE);
 489         i.putExtra(FileSyncService.IN_PROGRESS, inProgress);
 490         i.putExtra(FileSyncService.ACCOUNT_NAME, mAccount.name);
 491         if (dirRemotePath != null) {
 492             i.putExtra(FileSyncService.SYNC_FOLDER_REMOTE_PATH, dirRemotePath);
 493         }
 494         if (result != null) {
 495             i.putExtra(FileSyncService.SYNC_RESULT, result);
 496         }
 497         mContext.sendStickyBroadcast(i);
 498     }
 499
 500 }