ppapi/proxy/ext_crx_file_system_private_resource.h

   1 // Copyright (c) 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_EXT_CRX_FILE_SYSTEM_PRIVATE_RESOURCE_H_
  20 #define PPAPI_PROXY_EXT_CRX_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_ext_crx_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 ExtCrxFileSystemPrivateResource
  39     : public PluginResource,
  40       public thunk::PPB_Ext_CrxFileSystem_Private_API {
  41  public:
  42   ExtCrxFileSystemPrivateResource(Connection connection, PP_Instance instance);
  43   virtual ~ExtCrxFileSystemPrivateResource();
  44
  45   // Resource overrides.
  46   virtual thunk::PPB_Ext_CrxFileSystem_Private_API*
  47       AsPPB_Ext_CrxFileSystem_Private_API() OVERRIDE;
  48
  49   // PPB_Ext_CrxFileSystem_Private_API implementation.
  50   virtual int32_t Open(PP_Instance instance,
  51                        PP_Resource* file_system_resource,
  52                        scoped_refptr<TrackedCallback> callback) OVERRIDE;
  53
  54  private:
  55   void OnBrowserOpenComplete(PP_Resource* file_system_resource,
  56                              scoped_refptr<TrackedCallback> callback,
  57                              const ResourceMessageReplyParams& params,
  58                              const std::string& fsid);
  59
  60   bool called_open_;
  61
  62   DISALLOW_COPY_AND_ASSIGN(ExtCrxFileSystemPrivateResource);
  63 };
  64
  65 }  // namespace proxy
  66 }  // namespace ppapi
  67
  68 #endif  // PPAPI_PROXY_EXT_CRX_FILE_SYSTEM_PRIVATE_RESOURCE_H_