fileSystemProvider: First cut at implementing fileSystemProvider API

chrome/browser/extensions/api/file_system_provider/file_system_provider_api.cc

+// Copyright 2013 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 "chrome/browser/extensions/api/file_system_provider/file_system_provider_api.h"
+
+#include "chrome/common/extensions/api/file_system_provider.h"
+
+namespace extensions {
+
+namespace {
+
+const char kOK[] = "OK";
+
+// Names come from http://www.w3.org/TR/file-system-api/#errors-and-exceptions
+const char kEncodingError[] = "EncodingError";
+const char kInvalidModificationError[] = "InvalidModificationError";
+const char kInvalidStateError[] = "InvalidStateError";
+const char kNotFoundError[] = "NotFoundError";
+const char kNotReadableErr[] = "NotReadableErr";
+const char kNoModificationAllowedError[] = "NoModificationAllowedError";
+const char kPathExistsError[] = "PathExistsError";
+const char kQuotaExceededError[] = "QuotaExceededError";
+const char kSecurityError[] = "SecurityError";
+const char kTypeMismatchError[] = "TypeMismatchError";
+
+// Creates a dictionary, which looks like a DOMError. The returned dictionary
+// will be converted to a real DOMError object in
+// file_system_provier_custom_bindings.js.
+base::DictionaryValue* CreateError(const std::string& name,
+                                   const std::string& message) {
+  base::DictionaryValue* error = new base::DictionaryValue();
+  error->SetString("name", name);
+  error->SetString("message", message);
+  return error;
+}
+
+}  // namespace
+
+bool FileSystemProviderMountFunction::RunImpl() {
+  using extensions::api::file_system_provider::Mount::Params;
+  const scoped_ptr<Params> params(Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params);
+
+  // It's an error if the display name is empty.
+  if (params->display_name.empty()) {
+    const std::string file_system_id = "";
+
+    base::ListValue* result = new base::ListValue();
+    result->Append(new base::StringValue(file_system_id));
+    result->Append(CreateError(kSecurityError,
+                               "Empty display name is not allowed"));
+    SetResult(result);
+    SendResponse(true);
+    return true;
+  }
+
+  // TODO(satorux): Implement the real logic.
+  const std::string file_system_id = params->display_name;
+
+  base::ListValue* result = new base::ListValue();
+  result->Append(new base::StringValue(file_system_id));
+  // Don't append an error on success.
+
+  SetResult(result);
+  SendResponse(true);
+  return true;
+}
+
+}  // namespace extensions