API delegate for non-native file systems

extensions/browser/api/file_handlers/non_native_file_system_delegate.h

+// Copyright 2017 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.
+
+#ifndef EXTENSIONS_BROWSER_API_FILE_HANDLERS_NON_NATIVE_FILE_SYSTEM_DELEGATE_H_
+#define EXTENSIONS_BROWSER_API_FILE_HANDLERS_NON_NATIVE_FILE_SYSTEM_DELEGATE_H_
+
+#include "base/callback.h"
+#include "base/files/file_path.h"
+
+namespace content {
+class BrowserContext;
+}
+
+namespace extensions {
+
+// Delegate for extension APIs to delegate tasks to a non-native file system on
+// Chrome OS.
+class NonNativeFileSystemDelegate {
+ public:
+  virtual ~NonNativeFileSystemDelegate() {}
+
+  // Checks whether |path| points to a non-local filesystem that
+  // requires special handling.
+  virtual bool IsUnderNonNativeLocalPath(content::BrowserContext* context,
+                                         const base::FilePath& path) = 0;
+
+  // Returns the mime type of the file pointed by |path|, and asynchronously
+  // sends the result to |callback|.
+  virtual void GetNonNativeLocalPathMimeType(
+      content::BrowserContext* context,
+      const base::FilePath& path,
+      const base::Callback<void(bool, const std::string&)>& callback) = 0;
+
+  // Checks whether |path| points to a non-local filesystem directory and calls
+  // |callback| with the result asynchronously.
+  virtual void IsNonNativeLocalPathDirectory(
+      content::BrowserContext* context,
+      const base::FilePath& path,
+      const base::Callback<void(bool)>& callback) = 0;
+
+  // Ensures a non-local file exists at |path|, i.e., it does nothing if a file
+  // is already present, or creates a file there if it isn't. Asynchronously
+  // calls |callback| with a success value.
+  virtual void PrepareNonNativeLocalFileForWritableApp(
+      content::BrowserContext* context,
+      const base::FilePath& path,
+      const base::Callback<void(bool)>& callback) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_FILE_HANDLERS_NON_NATIVE_FILE_SYSTEM_DELEGATE_H_