The Tor Browser: mobile/android/base/sync/middleware/Crypto5MiddlewareRepositorySession.java@6474c204b198 (annotated)

mobile/android/base/sync/middleware/Crypto5MiddlewareRepositorySession.java@6474c204b198 (annotated)

mobile/android/base/sync/middleware/Crypto5MiddlewareRepositorySession.java

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 package org.mozilla.gecko.sync.middleware;
 import java.io.UnsupportedEncodingException;
 import java.util.concurrent.ExecutorService;
 import org.mozilla.gecko.sync.CryptoRecord;
 import org.mozilla.gecko.sync.crypto.CryptoException;
 import org.mozilla.gecko.sync.crypto.KeyBundle;
 import org.mozilla.gecko.sync.repositories.InactiveSessionException;
 import org.mozilla.gecko.sync.repositories.NoStoreDelegateException;
 import org.mozilla.gecko.sync.repositories.RecordFactory;
 import org.mozilla.gecko.sync.repositories.RepositorySession;
 import org.mozilla.gecko.sync.repositories.delegates.RepositorySessionFetchRecordsDelegate;
 import org.mozilla.gecko.sync.repositories.delegates.RepositorySessionStoreDelegate;
 import org.mozilla.gecko.sync.repositories.domain.Record;
 /**
  * It's a RepositorySession that accepts Records as input, producing CryptoRecords
  * for submission to a remote service.
  * Takes a RecordFactory as a parameter. This is in charge of taking decrypted CryptoRecords
  * as input and producing some expected kind of Record as output for local use.
  *
  *
                  +------------------------------------+
                  |    Server11RepositorySession       |
                  +-------------------------+----------+
                            ^               |
                            |               |
                         Encrypted CryptoRecords
                            |               |
                            |               v
                  +---------+--------------------------+
                  | Crypto5MiddlewareRepositorySession |
                  +------------------------------------+
                            ^               |
                            |               |  Decrypted CryptoRecords
                            |               |
                            |            +---------------+
                            |            | RecordFactory |
                            |            +--+------------+
                            |               |
                           Local Record instances
                            |               |
                            |               v
                  +---------+--------------------------+
                  |  Local RepositorySession instance  |
                  +------------------------------------+
  * @author rnewman
  *
  */
 public class Crypto5MiddlewareRepositorySession extends MiddlewareRepositorySession {
   private KeyBundle keyBundle;
   private RecordFactory recordFactory;
   public Crypto5MiddlewareRepositorySession(RepositorySession session, Crypto5MiddlewareRepository repository, RecordFactory recordFactory) {
     super(session, repository);
     this.keyBundle = repository.keyBundle;
     this.recordFactory = recordFactory;
   }
   public class DecryptingTransformingFetchDelegate implements RepositorySessionFetchRecordsDelegate {
     private RepositorySessionFetchRecordsDelegate next;
     private KeyBundle keyBundle;
     private RecordFactory recordFactory;
     DecryptingTransformingFetchDelegate(RepositorySessionFetchRecordsDelegate next, KeyBundle bundle, RecordFactory recordFactory) {
       this.next = next;
       this.keyBundle = bundle;
       this.recordFactory = recordFactory;
     }
     @Override
     public void onFetchFailed(Exception ex, Record record) {
       next.onFetchFailed(ex, record);
     }
     @Override
     public void onFetchedRecord(Record record) {
       CryptoRecord r;
       try {
         r = (CryptoRecord) record;
       } catch (ClassCastException e) {
         next.onFetchFailed(e, record);
         return;
       }
       r.keyBundle = keyBundle;
       try {
         r.decrypt();
       } catch (Exception e) {
         next.onFetchFailed(e, r);
         return;
       }
       Record transformed;
       try {
         transformed = this.recordFactory.createRecord(r);
       } catch (Exception e) {
         next.onFetchFailed(e, r);
         return;
       }
       next.onFetchedRecord(transformed);
     }
     @Override
     public void onFetchCompleted(final long fetchEnd) {
       next.onFetchCompleted(fetchEnd);
     }
     @Override
     public RepositorySessionFetchRecordsDelegate deferredFetchDelegate(ExecutorService executor) {
       // Synchronously perform *our* work, passing through appropriately.
       RepositorySessionFetchRecordsDelegate deferredNext = next.deferredFetchDelegate(executor);
       return new DecryptingTransformingFetchDelegate(deferredNext, keyBundle, recordFactory);
     }
   }
   private DecryptingTransformingFetchDelegate makeUnwrappingDelegate(RepositorySessionFetchRecordsDelegate inner) {
     if (inner == null) {
       throw new IllegalArgumentException("Inner delegate cannot be null!");
     }
     return new DecryptingTransformingFetchDelegate(inner, this.keyBundle, this.recordFactory);
   }
   @Override
   public void fetchSince(long timestamp,
                          RepositorySessionFetchRecordsDelegate delegate) {
     inner.fetchSince(timestamp, makeUnwrappingDelegate(delegate));
   }
   @Override
   public void fetch(String[] guids,
                     RepositorySessionFetchRecordsDelegate delegate) throws InactiveSessionException {
     inner.fetch(guids, makeUnwrappingDelegate(delegate));
   }
   @Override
   public void fetchAll(RepositorySessionFetchRecordsDelegate delegate) {
     inner.fetchAll(makeUnwrappingDelegate(delegate));
   }
   @Override
   public void setStoreDelegate(RepositorySessionStoreDelegate delegate) {
     // TODO: it remains to be seen how this will work.
     inner.setStoreDelegate(delegate);
     this.delegate = delegate;             // So we can handle errors without involving inner.
   }
   @Override
   public void store(Record record) throws NoStoreDelegateException {
     if (delegate == null) {
       throw new NoStoreDelegateException();
     }
     CryptoRecord rec = record.getEnvelope();
     rec.keyBundle = this.keyBundle;
     try {
       rec.encrypt();
     } catch (UnsupportedEncodingException e) {
       delegate.onRecordStoreFailed(e, record.guid);
       return;
     } catch (CryptoException e) {
       delegate.onRecordStoreFailed(e, record.guid);
       return;
     }
     // Allow the inner session to do delegate handling.
     inner.store(rec);
   }
 }

The Tor Browser / annotate

mobile/android/base/sync/middleware/Crypto5MiddlewareRepositorySession.java@6474c204b198 (annotated)

mobile/android/base/sync/middleware/Crypto5MiddlewareRepositorySession.java