ppapi/proxy/isolated_file_system_private_resource.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // CRX filesystem is a filesystem that allows an extension to read its own
   6 // package directory tree.  See ppapi/examples/crxfs for example.
   7 //
   8 // IMPLEMENTATION
   9 //
  10 // The implementation involves both browser and renderer.  In order to provide
  11 // readonly access to CRX filesystem (i.e. extension directory), we create an
  12 // "isolated filesystem" pointing to current extension directory in browser.
  13 // Then browser grants read permission to renderer, and tells plugin the
  14 // filesystem id, or fsid.
  15 //
  16 // Once the plugin receives the fsid, it creates a PPB_FileSystem and forwards
  17 // the fsid to PepperFileSystemHost in order to construct root url.
  18
  19 #ifndef PPAPI_PROXY_ISOLATED_FILE_SYSTEM_PRIVATE_RESOURCE_H_
  20 #define PPAPI_PROXY_ISOLATED_FILE_SYSTEM_PRIVATE_RESOURCE_H_
  21
  22 #include <string>
  23
  24 #include "base/memory/ref_counted.h"
  25 #include "ppapi/proxy/connection.h"
  26 #include "ppapi/proxy/plugin_resource.h"
  27 #include "ppapi/proxy/ppapi_proxy_export.h"
  28 #include "ppapi/thunk/ppb_isolated_file_system_private_api.h"
  29
  30 namespace ppapi {
  31
  32 class TrackedCallback;
  33
  34 namespace proxy {
  35
  36 class ResourceMessageReplyParams;
  37
  38 class PPAPI_PROXY_EXPORT IsolatedFileSystemPrivateResource
  39     : public PluginResource,
  40       public thunk::PPB_IsolatedFileSystem_Private_API {
  41  public:
  42   IsolatedFileSystemPrivateResource(
  43       Connection connection, PP_Instance instance);
  44   ~IsolatedFileSystemPrivateResource() override;
  45
  46   // Resource overrides.
  47   thunk::PPB_IsolatedFileSystem_Private_API*
  48       AsPPB_IsolatedFileSystem_Private_API() override;
  49
  50   // PPB_IsolatedFileSystem_Private_API implementation.
  51   int32_t Open(PP_Instance instance,
  52                PP_IsolatedFileSystemType_Private type,
  53                PP_Resource* file_system_resource,
  54                scoped_refptr<TrackedCallback> callback) override;
  55
  56  private:
  57   void OnBrowserOpenComplete(PP_IsolatedFileSystemType_Private type,
  58                              PP_Resource* file_system_resource,
  59                              scoped_refptr<TrackedCallback> callback,
  60                              const ResourceMessageReplyParams& params,
  61                              const std::string& fsid);
  62
  63   DISALLOW_COPY_AND_ASSIGN(IsolatedFileSystemPrivateResource);
  64 };
  65
  66 }  // namespace proxy
  67 }  // namespace ppapi
  68
  69 #endif  // PPAPI_PROXY_ISOLATED_FILE_SYSTEM_PRIVATE_RESOURCE_H_