// Copyright (c) 2011 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 WEBKIT_CHROMEOS_FILEAPI_CROS_MOUNT_POINT_PROVIDER_H_
#define WEBKIT_CHROMEOS_FILEAPI_CROS_MOUNT_POINT_PROVIDER_H_

#include <map>
#include <string>
#include <vector>

#include "base/file_path.h"
#include "base/synchronization/lock.h"
#include "webkit/fileapi/file_system_mount_point_provider.h"
#include "webkit/fileapi/local_file_util.h"
#include "webkit/quota/special_storage_policy.h"

namespace fileapi {
class FileSystemFileUtil;
}

namespace chromeos {

class FileAccessPermissions;

// An interface to provide local filesystem paths.
class CrosMountPointProvider
    : public fileapi::ExternalFileSystemMountPointProvider {
 public:
  CrosMountPointProvider(
      scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy);
  virtual ~CrosMountPointProvider();

  // fileapi::FileSystemMountPointProvider overrides.
  virtual bool IsAccessAllowed(const GURL& origin_url,
                               fileapi::FileSystemType type,
                               const FilePath& virtual_path) OVERRIDE;
  virtual void ValidateFileSystemRootAndGetURL(
      const GURL& origin_url,
      fileapi::FileSystemType type,
      bool create,
      const fileapi::FileSystemPathManager::GetRootPathCallback& callback)
          OVERRIDE;
  virtual FilePath ValidateFileSystemRootAndGetPathOnFileThread(
      const GURL& origin_url,
      fileapi::FileSystemType type,
      const FilePath& virtual_path,
      bool create);
  virtual bool IsRestrictedFileName(const FilePath& filename) const OVERRIDE;
  virtual std::vector<FilePath> GetRootDirectories() const OVERRIDE;
  virtual fileapi::FileSystemFileUtil* GetFileUtil() OVERRIDE;

  // fileapi::ExternalFileSystemMountPointProvider overrides.
  virtual void GrantFullAccessToExtension(
      const std::string& extension_id) OVERRIDE;
  virtual void GrantFileAccessToExtension(
      const std::string& extension_id, const FilePath& virtual_path) OVERRIDE;
  virtual void RevokeAccessForExtension(
      const std::string& extension_id) OVERRIDE;
  virtual void AddMountPoint(FilePath mount_point) OVERRIDE;
  virtual void RemoveMountPoint(FilePath mount_point) OVERRIDE;
  virtual bool GetVirtualPath(const FilePath& filesystem_path,
                              FilePath* virtual_path) OVERRIDE;

 private:
  class GetFileSystemRootPathTask;
  typedef std::map<std::string, FilePath> MountPointMap;

  // Gives the real file system's |root_path| for given |virtual_path|. Returns
  // false when |virtual_path| cannot be mapped to the real file system.
  bool GetRootForVirtualPath(const FilePath& virtual_path, FilePath* root_path);

  base::Lock lock_;  // Synchronize all access to path_map_.
  MountPointMap mount_point_map_;
  scoped_refptr<quota::SpecialStoragePolicy> special_storage_policy_;
  scoped_ptr<FileAccessPermissions> file_access_permissions_;
  scoped_ptr<fileapi::LocalFileUtil> local_file_util_;
  DISALLOW_COPY_AND_ASSIGN(CrosMountPointProvider);
};

}  // namespace chromeos

#endif  // WEBKIT_CHROMEOS_FILEAPI_CROS_MOUNT_POINT_PROVIDER_H_