Feature/import export encryption (#1533)

Add option to encrypt repository exports with a password and add possibility to decrypt them on repository import. Also make the repository export asynchronous. This implies that the repository export will be created on the server and can be downloaded multiple times. The repository export will be deleted automatically 10 days after creation.

scm-test/src/main/java/sonia/scm/store/InMemoryBlobStore.java

@@ -0,0 +1,129 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.store;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+public class InMemoryBlobStore implements BlobStore {
+
+  private final List<Blob> blobs = new ArrayList<>();
+
+  @Override
+  public Blob create() {
+    InMemoryBlob blob = new InMemoryBlob(UUID.randomUUID().toString());
+    blobs.add(blob);
+    return blob;
+  }
+
+  @Override
+  public Blob create(String id) {
+    InMemoryBlob blob = new InMemoryBlob(id);
+    blobs.add(blob);
+    return blob;
+  }
+
+  @Override
+  public void remove(Blob blob) {
+    blobs.remove(blob);
+  }
+
+  @Override
+  public List<Blob> getAll() {
+    return blobs;
+  }
+
+  @Override
+  public void clear() {
+    blobs.clear();
+  }
+
+  @Override
+  public void remove(String id) {
+    blobs.stream()
+      .filter(b -> b.getId().equals(id))
+      .findFirst()
+      .ifPresent(blobs::remove);
+  }
+
+  @Override
+  public Blob get(String id) {
+    return blobs.stream()
+      .filter(b -> b.getId().equals(id))
+      .findFirst()
+      .orElse(null);
+  }
+
+  private static class InMemoryBlob implements Blob {
+
+    private final String id;
+    private byte[] bytes = new byte[0];
+
+    private InMemoryBlob(String id) {
+      this.id = id;
+    }
+
+    @Override
+    public void commit() {
+      //Do nothing
+    }
+
+    @Override
+    public String getId() {
+      return id;
+    }
+
+    @Override
+    public InputStream getInputStream() throws FileNotFoundException {
+      return new ByteArrayInputStream(bytes);
+    }
+
+    @Override
+    public OutputStream getOutputStream() throws IOException {
+      return new InMemoryBlobByteArrayOutputStream();
+    }
+
+    @Override
+    public long getSize() {
+      return bytes.length;
+    }
+
+    private class InMemoryBlobByteArrayOutputStream extends ByteArrayOutputStream {
+
+      @Override
+      public void close() throws IOException {
+        bytes = super.toByteArray();
+        super.close();
+      }
+    }
+  }
+}