src/content/browser/renderer_host/pepper/pepper_external_file_ref_backend.cc

   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 #include "content/browser/renderer_host/pepper/pepper_external_file_ref_backend.h"
   6
   7 #include "base/files/file_path.h"
   8 #include "base/files/file_util_proxy.h"
   9 #include "content/browser/child_process_security_policy_impl.h"
  10 #include "content/public/browser/browser_thread.h"
  11 #include "ppapi/c/pp_errors.h"
  12 #include "ppapi/c/pp_time.h"
  13 #include "ppapi/host/ppapi_host.h"
  14 #include "ppapi/proxy/ppapi_messages.h"
  15 #include "ppapi/shared_impl/file_type_conversion.h"
  16 #include "ppapi/shared_impl/time_conversion.h"
  17
  18 namespace content {
  19
  20 PepperExternalFileRefBackend::PepperExternalFileRefBackend(
  21     ppapi::host::PpapiHost* host,
  22     int render_process_id,
  23     const base::FilePath& path)
  24     : host_(host),
  25       path_(path),
  26       render_process_id_(render_process_id),
  27       weak_factory_(this) {
  28   task_runner_ =
  29       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE);
  30 }
  31
  32 PepperExternalFileRefBackend::~PepperExternalFileRefBackend() {}
  33
  34 int32_t PepperExternalFileRefBackend::MakeDirectory(
  35     ppapi::host::ReplyMessageContext reply_context,
  36     int32_t make_directory_flags) {
  37   // This operation isn't supported for external filesystems.
  38   return PP_ERROR_NOACCESS;
  39 }
  40
  41 int32_t PepperExternalFileRefBackend::Touch(
  42     ppapi::host::ReplyMessageContext reply_context,
  43     PP_Time last_access_time,
  44     PP_Time last_modified_time) {
  45   IPC::Message reply_msg = PpapiPluginMsg_FileRef_TouchReply();
  46   base::FileUtilProxy::Touch(
  47       task_runner_.get(),
  48       path_,
  49       ppapi::PPTimeToTime(last_access_time),
  50       ppapi::PPTimeToTime(last_modified_time),
  51       base::Bind(&PepperExternalFileRefBackend::DidFinish,
  52                  weak_factory_.GetWeakPtr(),
  53                  reply_context,
  54                  reply_msg));
  55   return PP_OK_COMPLETIONPENDING;
  56 }
  57
  58 int32_t PepperExternalFileRefBackend::Delete(
  59     ppapi::host::ReplyMessageContext reply_context) {
  60   // This operation isn't supported for external filesystems.
  61   return PP_ERROR_NOACCESS;
  62 }
  63
  64 int32_t PepperExternalFileRefBackend::Rename(
  65     ppapi::host::ReplyMessageContext reply_context,
  66     PepperFileRefHost* new_file_ref) {
  67   // This operation isn't supported for external filesystems.
  68   return PP_ERROR_NOACCESS;
  69 }
  70
  71 int32_t PepperExternalFileRefBackend::Query(
  72     ppapi::host::ReplyMessageContext reply_context) {
  73   bool ok = base::FileUtilProxy::GetFileInfo(
  74       task_runner_.get(),
  75       path_,
  76       base::Bind(&PepperExternalFileRefBackend::GetMetadataComplete,
  77                  weak_factory_.GetWeakPtr(),
  78                  reply_context));
  79   DCHECK(ok);
  80   return PP_OK_COMPLETIONPENDING;
  81 }
  82
  83 int32_t PepperExternalFileRefBackend::ReadDirectoryEntries(
  84     ppapi::host::ReplyMessageContext context) {
  85   // This operation isn't supported for external filesystems.
  86   return PP_ERROR_NOACCESS;
  87 }
  88
  89 int32_t PepperExternalFileRefBackend::GetAbsolutePath(
  90     ppapi::host::ReplyMessageContext reply_context) {
  91   host_->SendReply(
  92       reply_context,
  93       PpapiPluginMsg_FileRef_GetAbsolutePathReply(path_.AsUTF8Unsafe()));
  94
  95   // Use PP_OK_COMPLETIONPENDING instead of PP_OK since we've already sent our
  96   // reply above.
  97   return PP_OK_COMPLETIONPENDING;
  98 }
  99
 100 storage::FileSystemURL PepperExternalFileRefBackend::GetFileSystemURL() const {
 101   return storage::FileSystemURL();
 102 }
 103
 104 base::FilePath PepperExternalFileRefBackend::GetExternalFilePath() const {
 105   return path_;
 106 }
 107
 108 int32_t PepperExternalFileRefBackend::CanRead() const {
 109   if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(
 110           render_process_id_, path_)) {
 111     return PP_ERROR_NOACCESS;
 112   }
 113   return PP_OK;
 114 }
 115
 116 int32_t PepperExternalFileRefBackend::CanWrite() const {
 117   // Platform files have coarse-grained grants in ChildProcessSecurityPolicy.
 118   return CanReadWrite();
 119 }
 120
 121 int32_t PepperExternalFileRefBackend::CanCreate() const {
 122   // Platform files have coarse-grained grants in ChildProcessSecurityPolicy.
 123   return CanReadWrite();
 124 }
 125
 126 int32_t PepperExternalFileRefBackend::CanReadWrite() const {
 127   if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanCreateReadWriteFile(
 128           render_process_id_, path_)) {
 129     return PP_ERROR_NOACCESS;
 130   }
 131   return PP_OK;
 132 }
 133
 134 void PepperExternalFileRefBackend::DidFinish(
 135     ppapi::host::ReplyMessageContext reply_context,
 136     const IPC::Message& msg,
 137     base::File::Error error) {
 138   reply_context.params.set_result(ppapi::FileErrorToPepperError(error));
 139   host_->SendReply(reply_context, msg);
 140 }
 141
 142 void PepperExternalFileRefBackend::GetMetadataComplete(
 143     ppapi::host::ReplyMessageContext reply_context,
 144     const base::File::Error error,
 145     const base::File::Info& file_info) {
 146   reply_context.params.set_result(ppapi::FileErrorToPepperError(error));
 147
 148   PP_FileInfo pp_file_info;
 149   if (error == base::File::FILE_OK) {
 150     ppapi::FileInfoToPepperFileInfo(
 151         file_info, PP_FILESYSTEMTYPE_EXTERNAL, &pp_file_info);
 152   } else {
 153     memset(&pp_file_info, 0, sizeof(pp_file_info));
 154   }
 155
 156   host_->SendReply(reply_context,
 157                    PpapiPluginMsg_FileRef_QueryReply(pp_file_info));
 158 }
 159
 160 }  // namespace content