Do PPB_FileIO Query and Read in the plugin process.

content/renderer/pepper/pepper_file_io_host.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/pepper/pepper_file_io_host.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/files/file_util_proxy.h"
 #include "content/child/child_thread.h"
 #include "content/child/fileapi/file_system_dispatcher.h"
 #include "content/child/quota_dispatcher.h"
 #include "content/common/fileapi/file_system_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/common/content_client.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/renderer/pepper/host_globals.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 #include "content/renderer/pepper/ppb_file_ref_impl.h"
 #include "content/renderer/pepper/quota_file_io.h"
 #include "content/renderer/render_thread_impl.h"
 #include "ppapi/c/pp_errors.h"
+#include "ppapi/c/ppb_file_io.h"
 #include "ppapi/host/dispatch_host_message.h"
 #include "ppapi/host/ppapi_host.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/file_type_conversion.h"
 #include "ppapi/shared_impl/time_conversion.h"
 #include "ppapi/thunk/enter.h"
 #include "third_party/WebKit/public/web/WebPluginContainer.h"
 
 namespace content {
 
@@ skipping 100 matching lines @@
                quota::kQuotaLimitTypeUnknown,
                PepperFileIOHost::NotifyCloseFileCallback());
 }
 
 }  // namespace
 
 PepperFileIOHost::PepperFileIOHost(RendererPpapiHost* host,
                                    PP_Instance instance,
                                    PP_Resource resource)
     : ResourceHost(host->GetPpapiHost(), instance, resource),
+      renderer_ppapi_host_(host),
       file_(base::kInvalidPlatformFileValue),
       file_system_type_(PP_FILESYSTEMTYPE_INVALID),
       quota_policy_(quota::kQuotaLimitTypeUnknown),
       is_running_in_process_(host->IsRunningInProcess()),
       open_flags_(0),
       weak_factory_(this),
       routing_id_(RenderThreadImpl::current()->GenerateRoutingID()) {
       ChildThread::current()->AddRoute(routing_id_, this);
 }
 
@@ skipping 358 matching lines @@
   state_manager_.SetPendingOperation(FileIOStateManager::OPERATION_EXCLUSIVE);
   return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PepperFileIOHost::OnHostMsgRequestOSFileHandle(
     ppapi::host::HostMessageContext* context) {
   if (!is_running_in_process_ &&
       quota_policy_ != quota::kQuotaLimitTypeUnlimited)
     return PP_ERROR_FAILED;
 
-  RendererPpapiHost* renderer_ppapi_host =
-      RendererPpapiHost::GetForPPInstance(pp_instance());
-
   // Whitelist to make it privately accessible.
   if (!GetContentClient()->renderer()->IsPluginAllowedToCallRequestOSFileHandle(
-          renderer_ppapi_host->GetContainerForInstance(pp_instance())))
+          renderer_ppapi_host_->GetContainerForInstance(pp_instance())))
     return PP_ERROR_NOACCESS;
 
   IPC::PlatformFileForTransit file =
-      renderer_ppapi_host->ShareHandleWithRemote(file_, false);
+      renderer_ppapi_host_->ShareHandleWithRemote(file_, false);
   if (file == IPC::InvalidPlatformFileForTransit())
     return PP_ERROR_FAILED;
   ppapi::host::ReplyMessageContext reply_context =
       context->MakeReplyMessageContext();
   ppapi::proxy::SerializedHandle file_handle;
   file_handle.set_file_handle(file, open_flags_);
   reply_context.params.AppendHandle(file_handle);
   host()->SendReply(reply_context,
                     PpapiPluginMsg_FileIO_RequestOSFileHandleReply());
   return PP_OK_COMPLETIONPENDING;
@@ skipping 32 matching lines @@
     base::PlatformFileError error_code,
     base::PassPlatformFile file) {
   int32_t pp_error = ::ppapi::PlatformFileErrorToPepperError(error_code);
   if (pp_error == PP_OK)
     state_manager_.SetOpenSucceed();
 
   DCHECK(file_ == base::kInvalidPlatformFileValue);
   file_ = file.ReleaseValue();
 
   DCHECK(!quota_file_io_.get());
-  if (file_ != base::kInvalidPlatformFileValue &&
-      (file_system_type_ == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
-       file_system_type_ == PP_FILESYSTEMTYPE_LOCALPERSISTENT)) {
-    quota_file_io_.reset(new QuotaFileIO(
-        new QuotaFileIODelegate, file_, file_system_url_, file_system_type_));
+  if (file_ != base::kInvalidPlatformFileValue) {
+    if (file_system_type_ == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
+        file_system_type_ == PP_FILESYSTEMTYPE_LOCALPERSISTENT) {
+      quota_file_io_.reset(new QuotaFileIO(
+          new QuotaFileIODelegate, file_, file_system_url_, file_system_type_));
+    }
+
+    IPC::PlatformFileForTransit file_for_transit =
+        renderer_ppapi_host_->ShareHandleWithRemote(file_, false);
+    if (!(file_for_transit == IPC::InvalidPlatformFileForTransit())) {
+      // Send the file descriptor to the plugin process. This is used in the
+      // plugin for any file operations that can be done there.
+      // IMPORTANT: Clear PP_FILEOPENFLAG_WRITE and PP_FILEOPENFLAG_APPEND so
+      // the plugin can't write and so bypass our quota checks.
+      int32_t no_write_flags =
+          open_flags_ & ~(PP_FILEOPENFLAG_WRITE | PP_FILEOPENFLAG_APPEND);
+      ppapi::proxy::SerializedHandle file_handle;
+      file_handle.set_file_handle(file_for_transit, no_write_flags);
+      reply_context.params.AppendHandle(file_handle);
+    }
   }
 
   reply_context.params.set_result(pp_error);
   host()->SendReply(reply_context, PpapiPluginMsg_FileIO_OpenReply());
   state_manager_.SetOperationFinished();
 }
 
 void PepperFileIOHost::ExecutePlatformOpenFileSystemURLCallback(
     ppapi::host::ReplyMessageContext reply_context,
     base::PlatformFileError error_code,
@@ skipping 43 matching lines @@
   // On the plugin side, the callback expects a parameter with different meaning
   // depends on whether is negative or not. It is the result here. We translate
   // for the callback.
   int32_t pp_error = ::ppapi::PlatformFileErrorToPepperError(error_code);
   reply_context.params.set_result(ErrorOrByteNumber(pp_error, bytes_written));
   host()->SendReply(reply_context, PpapiPluginMsg_FileIO_GeneralReply());
   state_manager_.SetOperationFinished();
 }
 
 }  // namespace content