Add storage managers (local, sftp, s3, hybrid).

app/logical/storage_manager/local.rb

@@ -0,0 +1,25 @@
+class StorageManager::Local < StorageManager
+  DEFAULT_PERMISSIONS = 0644
+
+  def store(io, dest_path)
+    temp_path = dest_path + "-" + SecureRandom.uuid + ".tmp"
+
+    FileUtils.mkdir_p(File.dirname(temp_path))
+    bytes_copied = IO.copy_stream(io, temp_path)
+    raise Error, "store failed: #{bytes_copied}/#{io.size} bytes copied" if bytes_copied != io.size
+
+    FileUtils.chmod(DEFAULT_PERMISSIONS, temp_path)
+    File.rename(temp_path, dest_path)
+  rescue StandardError => e
+    FileUtils.rm_f(temp_path)
+    raise Error, e
+  end
+
+  def delete(path)
+    FileUtils.rm_f(path)
+  end
+
+  def open(path)
+    File.open(path, "r", binmode: true)
+  end
+end