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// Copyright 2023 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/blob_storage/file_backed_blob_factory_base.h"
#include "base/functional/callback_helpers.h"
#include "base/process/process_handle.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "content/browser/blob_storage/chrome_blob_storage_context.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_process_host.h"
#include "storage/browser/blob/blob_data_builder.h"
#include "storage/browser/blob/blob_impl.h"
#include "storage/browser/blob/blob_registry_impl.h"
#include "third_party/blink/public/mojom/blob/data_element.mojom.h"
#include "url/gurl.h"
namespace content {
namespace {
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
GetAccessCallback(const GURL& url_for_file_access_checks) {
if (!file_access::ScopedFileAccessDelegate::HasInstance() ||
!url_for_file_access_checks.is_valid()) {
return base::NullCallback();
}
file_access::ScopedFileAccessDelegate* file_access =
file_access::ScopedFileAccessDelegate::Get();
CHECK(file_access);
return file_access->CreateFileAccessCallback(url_for_file_access_checks);
}
void ContinueRegisterBlob(
mojo::PendingReceiver<blink::mojom::Blob> blob,
std::string uuid,
std::string content_type,
blink::mojom::DataElementFilePtr file,
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
file_access,
bool security_check_success,
mojo::ReportBadMessageCallback bad_message_callback,
scoped_refptr<ChromeBlobStorageContext> blob_storage_context,
blink::mojom::FileBackedBlobFactory::RegisterBlobSyncCallback
finish_callback) {
DCHECK_CURRENTLY_ON(BrowserThread::IO);
base::ScopedClosureRunner scoped_finish_callback(std::move(finish_callback));
if (blob_storage_context->context()->registry().HasEntry(uuid) ||
uuid.empty()) {
std::move(bad_message_callback)
.Run("Invalid UUID passed to FileBackedBlobFactoryImpl::RegisterBlob");
return;
}
if (!security_check_success) {
std::unique_ptr<storage::BlobDataHandle> handle =
blob_storage_context->context()->AddBrokenBlob(
uuid, content_type, /*content_disposition=*/"",
storage::BlobStatus::ERR_REFERENCED_FILE_UNAVAILABLE);
storage::BlobImpl::Create(std::move(handle), std::move(blob));
return;
}
auto builder = std::make_unique<storage::BlobDataBuilder>(uuid);
if (file->length > 0) {
builder->AppendFile(file->path, file->offset, file->length,
file->expected_modification_time.value_or(base::Time()),
file_access);
}
builder->set_content_type(content_type);
std::unique_ptr<storage::BlobDataHandle> handle =
blob_storage_context->context()->AddFinishedBlob(std::move(builder));
CHECK(!handle->IsBroken());
storage::BlobImpl::Create(std::move(handle), std::move(blob));
}
} // namespace
FileBackedBlobFactoryBase::FileBackedBlobFactoryBase(int process_id)
: process_id_(process_id) {}
FileBackedBlobFactoryBase::~FileBackedBlobFactoryBase() = default;
void FileBackedBlobFactoryBase::RegisterBlob(
mojo::PendingReceiver<blink::mojom::Blob> blob,
const std::string& uuid,
const std::string& content_type,
blink::mojom::DataElementFilePtr file) {
// We can safely perform the registration asynchronously since blob remote
// messages are managed by the mojo infrastructure until the blob pending
// receiver is resolved, and this happens when the async registration is
// completed. Without the mojo continuation callback the `RegisterBlobSync`
// call is async.
RegisterBlobSync(std::move(blob), uuid, content_type, std::move(file),
base::NullCallback());
}
void FileBackedBlobFactoryBase::RegisterBlobSync(
mojo::PendingReceiver<blink::mojom::Blob> blob,
const std::string& uuid,
const std::string& content_type,
blink::mojom::DataElementFilePtr file,
RegisterBlobSyncCallback finish_callback) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
bool security_check_success =
ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(process_id_,
file->path);
GURL url_for_file_access_checks = GetCurrentUrl();
if (finish_callback) {
finish_callback =
base::BindPostTask(base::SequencedTaskRunner::GetCurrentDefault(),
std::move(finish_callback));
}
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&ContinueRegisterBlob, std::move(blob), uuid, content_type,
std::move(file),
GetAccessCallback(url_for_file_access_checks),
security_check_success,
base::BindPostTask(GetUIThreadTaskRunner({}),
GetBadMessageCallback()),
blob_storage_context_, std::move(finish_callback)));
}
} // namespace content
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