1 files changed, 46 insertions, 0 deletions
diff --git a/osp_base/json/json_writer.cc b/osp_base/json/json_writer.cc
new file mode 100644
index 00000000..1d3d94f9
--- /dev/null
+++ b/osp_base/json/json_writer.cc
@@ -0,0 +1,46 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "osp_base/json/json_writer.h"
+
+#include <memory>
+#include <sstream>
+#include <string>
+#include <utility>
+
+#include "json/value.h"
+#include "osp_base/error.h"
+#include "platform/api/logging.h"
+
+namespace openscreen {
+JsonWriter::JsonWriter() {
+#ifndef _DEBUG
+  // Default is to "pretty print" the output JSON in a human readable
+  // format. On non-debug builds, we can remove pretty printing by simply
+  // getting rid of all indentation.
+  factory_["indentation"] = "";
+#endif
+}
+
+ErrorOr<std::string> JsonWriter::Write(const Json::Value& value) {
+  if (value.empty()) {
+    return ErrorOr<std::string>(Error::Code::kJsonWriteError, "Empty value");
+  }
+
+  std::unique_ptr<Json::StreamWriter> const writer(factory_.newStreamWriter());
+  std::stringstream stream;
+  writer->write(value, &stream);
+  stream << std::endl;
+
+  if (!stream) {
+    // Note: jsoncpp doesn't give us more information about what actually
+    // went wrong, just says to "check the stream". However, failures on
+    // the stream should be rare, as we do not throw any errors in the jsoncpp
+    // library.
+    return ErrorOr<std::string>(Error::Code::kJsonWriteError, "Invalid stream");
+  }
+
+  return stream.str();
+}
+}  // namespace openscreen