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      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   virtual ~IsolatedFileSystemPrivateResource();
     45 
     46   // Resource overrides.
     47   virtual thunk::PPB_IsolatedFileSystem_Private_API*
     48       AsPPB_IsolatedFileSystem_Private_API() OVERRIDE;
     49 
     50   // PPB_IsolatedFileSystem_Private_API implementation.
     51   virtual 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_
     70