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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/pepper/pepper_external_file_ref_backend.h"
#include <string.h>
#include "base/compiler_specific.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/task/thread_pool.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/public/browser/browser_thread.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/c/pp_time.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"
namespace content {
namespace {
struct GetFileInfoResults {
base::File::Error error;
base::File::Info info;
};
using GetFileInfoCallback =
base::OnceCallback<void(base::File::Error, const base::File::Info&)>;
GetFileInfoResults DoGetFileInfo(const base::FilePath& path) {
GetFileInfoResults results;
if (!base::PathExists(path)) {
results.error = base::File::FILE_ERROR_NOT_FOUND;
return results;
}
results.error = base::GetFileInfo(path, &results.info)
? base::File::FILE_OK
: base::File::FILE_ERROR_FAILED;
return results;
}
void SendGetFileInfoResults(GetFileInfoCallback callback,
const GetFileInfoResults& results) {
std::move(callback).Run(results.error, results.info);
}
base::File::Error CallTouchFile(const base::FilePath& path,
PP_Time last_access_time,
PP_Time last_modified_time) {
bool result = base::TouchFile(path, ppapi::PPTimeToTime(last_access_time),
ppapi::PPTimeToTime(last_modified_time));
return result ? base::File::FILE_OK : base::File::FILE_ERROR_FAILED;
}
} // namespace
PepperExternalFileRefBackend::PepperExternalFileRefBackend(
ppapi::host::PpapiHost* host,
int render_process_id,
const base::FilePath& path)
: host_(host),
path_(path),
render_process_id_(render_process_id),
task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::USER_VISIBLE,
base::TaskShutdownBehavior::BLOCK_SHUTDOWN})) {}
PepperExternalFileRefBackend::~PepperExternalFileRefBackend() {}
int32_t PepperExternalFileRefBackend::MakeDirectory(
ppapi::host::ReplyMessageContext reply_context,
int32_t make_directory_flags) {
// This operation isn't supported for external filesystems.
return PP_ERROR_NOACCESS;
}
int32_t PepperExternalFileRefBackend::Touch(
ppapi::host::ReplyMessageContext reply_context,
PP_Time last_access_time,
PP_Time last_modified_time) {
IPC::Message reply_msg = PpapiPluginMsg_FileRef_TouchReply();
task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
BindOnce(&CallTouchFile, path_, last_access_time, last_modified_time),
base::BindOnce(&PepperExternalFileRefBackend::DidFinish,
weak_factory_.GetWeakPtr(), reply_context, reply_msg));
return PP_OK_COMPLETIONPENDING;
}
int32_t PepperExternalFileRefBackend::Delete(
ppapi::host::ReplyMessageContext reply_context) {
// This operation isn't supported for external filesystems.
return PP_ERROR_NOACCESS;
}
int32_t PepperExternalFileRefBackend::Rename(
ppapi::host::ReplyMessageContext reply_context,
PepperFileRefHost* new_file_ref) {
// This operation isn't supported for external filesystems.
return PP_ERROR_NOACCESS;
}
int32_t PepperExternalFileRefBackend::Query(
ppapi::host::ReplyMessageContext reply_context) {
bool ok = task_runner_->PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(&DoGetFileInfo, path_),
base::BindOnce(
&SendGetFileInfoResults,
base::BindOnce(&PepperExternalFileRefBackend::GetMetadataComplete,
weak_factory_.GetWeakPtr(), reply_context)));
DCHECK(ok);
return PP_OK_COMPLETIONPENDING;
}
int32_t PepperExternalFileRefBackend::ReadDirectoryEntries(
ppapi::host::ReplyMessageContext context) {
// This operation isn't supported for external filesystems.
return PP_ERROR_NOACCESS;
}
int32_t PepperExternalFileRefBackend::GetAbsolutePath(
ppapi::host::ReplyMessageContext reply_context) {
host_->SendReply(
reply_context,
PpapiPluginMsg_FileRef_GetAbsolutePathReply(path_.AsUTF8Unsafe()));
// Use PP_OK_COMPLETIONPENDING instead of PP_OK since we've already sent our
// reply above.
return PP_OK_COMPLETIONPENDING;
}
storage::FileSystemURL PepperExternalFileRefBackend::GetFileSystemURL() const {
return storage::FileSystemURL();
}
base::FilePath PepperExternalFileRefBackend::GetExternalFilePath() const {
return path_;
}
int32_t PepperExternalFileRefBackend::CanRead() const {
if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(
render_process_id_, path_)) {
return PP_ERROR_NOACCESS;
}
return PP_OK;
}
int32_t PepperExternalFileRefBackend::CanWrite() const {
// Platform files have coarse-grained grants in ChildProcessSecurityPolicy.
return CanReadWrite();
}
int32_t PepperExternalFileRefBackend::CanCreate() const {
// Platform files have coarse-grained grants in ChildProcessSecurityPolicy.
return CanReadWrite();
}
int32_t PepperExternalFileRefBackend::CanReadWrite() const {
if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanCreateReadWriteFile(
render_process_id_, path_)) {
return PP_ERROR_NOACCESS;
}
return PP_OK;
}
void PepperExternalFileRefBackend::DidFinish(
ppapi::host::ReplyMessageContext reply_context,
const IPC::Message& msg,
base::File::Error error) {
reply_context.params.set_result(ppapi::FileErrorToPepperError(error));
host_->SendReply(reply_context, msg);
}
void PepperExternalFileRefBackend::GetMetadataComplete(
ppapi::host::ReplyMessageContext reply_context,
const base::File::Error error,
const base::File::Info& file_info) {
reply_context.params.set_result(ppapi::FileErrorToPepperError(error));
PP_FileInfo pp_file_info;
if (error == base::File::FILE_OK) {
ppapi::FileInfoToPepperFileInfo(
file_info, PP_FILESYSTEMTYPE_EXTERNAL, &pp_file_info);
} else {
UNSAFE_TODO(memset(&pp_file_info, 0, sizeof(pp_file_info)));
}
host_->SendReply(reply_context,
PpapiPluginMsg_FileRef_QueryReply(pp_file_info));
}
} // namespace content
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