public AtomicAction ActionToChangeEncryptionKey(SymmetricKey newKey)
{
var action = new AtomicAction();
// Find all the blob files:
var blobs = default(string[]);
var oldKey = EncryptionKey;
blobs = Directory.GetFiles(_path, "*" + FileExtension);
if (blobs.Length == 0)
{
// No blobs, so nothing to encrypt. Just add/remove the encryption marker file:
action.AddLogic(() =>
{
Log.To.NoDomain.D(TAG, "{0} {1}", (newKey != null) ? "encrypting" : "decrypting", _path);
Log.To.NoDomain.D(TAG, " No blobs to copy; done.");
EncryptionKey = newKey;
MarkEncrypted(newKey != null);
}, () =>
{
EncryptionKey = oldKey;
MarkEncrypted(oldKey != null);
}, null);
return(action);
}
// Create a new directory for the new blob store. Have to do this now, before starting the
// action, because farther down we create an action to move it...
var tempPath = Path.Combine(Path.GetTempPath(), String.Format("CouchbaseLite-Temp-{0}", Misc.CreateGUID()));
action.AddLogic(() =>
{
Log.To.NoDomain.D(TAG, "{0} {1}", (newKey != null) ? "encrypting" : "decrypting", _path);
Directory.CreateDirectory(tempPath);
}, () => Directory.Delete(tempPath, true), null);
var tempStore = default(BlobStore);
action.AddLogic(() =>
{
tempStore = new BlobStore(tempPath, newKey);
tempStore.MarkEncrypted(true);
}, null, null);
// Copy each of my blobs into the new store (which will update its encryption):
action.AddLogic(() =>
{
foreach (var blobName in blobs)
{
// Copy file by reading with old key and writing with new one:
Log.To.NoDomain.D(TAG, " Copying {0}", blobName);
Stream readStream = File.Open(blobName, FileMode.Open, FileAccess.Read, FileShare.Read);
if (EncryptionKey != null)
{
readStream = EncryptionKey.DecryptStream(readStream);
}
var writer = new BlobStoreWriter(tempStore);
try {
writer.Read(readStream);
writer.Finish();
writer.Install();
} catch (Exception) {
writer.Cancel();
throw;
} finally {
readStream.Dispose();
}
}
}, null, null);
// Replace the attachment dir with the new one:
action.AddLogic(AtomicAction.MoveDirectory(tempPath, _path));
// Finally update EncryptionKey:
action.AddLogic(() =>
{
EncryptionKey = newKey;
}, () =>
{
EncryptionKey = oldKey;
}, null);
return(action);
}
public bool HasBlobForKey(BlobKey key)
{
return(File.Exists(PathForKey(key)));
}