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content / browser / network / http_cache_backend_file_operations_factory.cc [blame]
// Copyright 2022 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/network/http_cache_backend_file_operations_factory.h"
#include <string_view>
#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/task/thread_pool.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "net/disk_cache/cache_util.h"
#include "net/disk_cache/simple/simple_file_enumerator.h"
#include "net/disk_cache/simple/simple_util.h"
namespace content {
namespace {
using OpenFileFlags = network::mojom::HttpCacheBackendOpenFileFlags;
static_assert(static_cast<uint32_t>(OpenFileFlags::kOpenAndRead) ==
(base::File::FLAG_OPEN | base::File::FLAG_READ),
"kOpenAndRead");
static_assert(static_cast<uint32_t>(OpenFileFlags::kCreateAndWrite) ==
(base::File::FLAG_CREATE | base::File::FLAG_WRITE),
"kCreateAndWrite");
static_assert(
static_cast<uint32_t>(OpenFileFlags::kOpenReadWriteWinShareDelete) ==
(base::File::FLAG_OPEN | base::File::FLAG_READ |
base::File::FLAG_WRITE | base::File::FLAG_WIN_SHARE_DELETE),
"kOpenReadWriteWinShareDelete");
static_assert(
static_cast<uint32_t>(OpenFileFlags::kCreateReadWriteWinShareDelete) ==
(base::File::FLAG_CREATE | base::File::FLAG_READ |
base::File::FLAG_WRITE | base::File::FLAG_WIN_SHARE_DELETE),
"kCreateReadWriteWinShareDelete");
static_assert(
static_cast<uint32_t>(OpenFileFlags::kCreateAlwaysWriteWinShareDelete) ==
(base::File::FLAG_CREATE_ALWAYS | base::File::FLAG_WRITE |
base::File::FLAG_WIN_SHARE_DELETE),
"kCreateReadWriteWinShareDelete");
static_assert(static_cast<uint32_t>(
OpenFileFlags::kOpenReadWinShareDeleteWinSequentialScan) ==
(base::File::FLAG_OPEN | base::File::FLAG_READ |
base::File::FLAG_WIN_SHARE_DELETE |
base::File::FLAG_WIN_SEQUENTIAL_SCAN),
"kOpenReadWinShareDeleteWinSequentialScan");
class FileEnumerator final : public network::mojom::FileEnumerator {
public:
explicit FileEnumerator(const base::FilePath& path) : enumerator_(path) {}
~FileEnumerator() override = default;
void GetNext(uint32_t num_entries, GetNextCallback callback) override {
std::vector<disk_cache::BackendFileOperations::FileEnumerationEntry>
entries;
bool end = false;
for (uint32_t i = 0; i < num_entries; ++i) {
if (auto entry = enumerator_.Next()) {
entries.push_back(std::move(*entry));
} else {
end = true;
break;
}
}
std::move(callback).Run(entries, end, enumerator_.HasError());
}
private:
disk_cache::SimpleFileEnumerator enumerator_;
};
class HttpCacheBackendFileOperations final
: public network::mojom::HttpCacheBackendFileOperations {
public:
// All the operations must be performed under `path`.
explicit HttpCacheBackendFileOperations(const base::FilePath& path)
: path_(path) {
DCHECK(path.IsAbsolute());
}
~HttpCacheBackendFileOperations() override = default;
void CreateDirectory(const base::FilePath& path,
CreateDirectoryCallback callback) override {
if (!IsValid(path, "CreateDirectory")) {
std::move(callback).Run(false);
return;
}
bool result = base::CreateDirectory(path);
DVLOG(1) << "CreateDirectory: path = " << path << " => " << result;
std::move(callback).Run(result);
}
void PathExists(const base::FilePath& path,
PathExistsCallback callback) override {
if (!IsValid(path, "PathExists")) {
std::move(callback).Run(false);
return;
}
bool result = base::PathExists(path);
DVLOG(1) << "PathExists: path = " << path << " => " << result;
std::move(callback).Run(result);
}
void DirectoryExists(const base::FilePath& path,
DirectoryExistsCallback callback) override {
if (!IsValid(path, "DirectoryExists")) {
std::move(callback).Run(false);
return;
}
bool result = base::DirectoryExists(path);
DVLOG(1) << "DirectoryExists: path = " << path << " => " << result;
std::move(callback).Run(result);
}
void OpenFile(const base::FilePath& path,
network::mojom::HttpCacheBackendOpenFileFlags flags,
OpenFileCallback callback) override {
// `flags` has already been checked in the deserializer.
if (!IsValid(path, "OpenFile")) {
std::move(callback).Run(base::File(),
base::File::FILE_ERROR_ACCESS_DENIED);
return;
}
auto flags_to_pass = static_cast<uint32_t>(flags);
base::File file(path, flags_to_pass);
base::File::Error error = file.error_details();
DVLOG(1) << "OpenFile: path = " << path << ", flags = " << flags_to_pass
<< " => file.IsValid() = " << file.IsValid();
std::move(callback).Run(std::move(file), error);
}
void DeleteFile(const base::FilePath& path,
network::mojom::HttpCacheBackendDeleteFileMode mode,
DeleteFileCallback callback) override {
using network::mojom::HttpCacheBackendDeleteFileMode;
if (!IsValid(path, "DeleteFile")) {
std::move(callback).Run(false);
return;
}
bool result = false;
switch (mode) {
case HttpCacheBackendDeleteFileMode::kDefault:
result = base::DeleteFile(path);
break;
case HttpCacheBackendDeleteFileMode::kEnsureImmediateAvailability:
result = disk_cache::simple_util::SimpleCacheDeleteFile(path);
break;
}
DVLOG(1) << "DeleteFile: path = " << path << " => " << result;
std::move(callback).Run(result);
}
void RenameFile(const base::FilePath& from_path,
const base::FilePath& to_path,
RenameFileCallback callback) override {
if (!IsValid(from_path, "RenameFile (from)")) {
std::move(callback).Run(base::File::FILE_ERROR_ACCESS_DENIED);
return;
}
if (!IsValid(to_path, "RenameFile (to)")) {
std::move(callback).Run(base::File::FILE_ERROR_ACCESS_DENIED);
return;
}
base::File::Error error = base::File::FILE_OK;
base::ReplaceFile(from_path, to_path, &error);
DVLOG(1) << "DeleteFile: from_path = " << from_path
<< ", to_path = " << to_path << " => " << error;
std::move(callback).Run(error);
}
void GetFileInfo(const base::FilePath& path,
GetFileInfoCallback callback) override {
if (!IsValid(path, "GetFileInfo")) {
std::move(callback).Run(std::nullopt);
return;
}
base::File::Info file_info;
bool ok = base::GetFileInfo(path, &file_info);
DVLOG(1) << "GetFileInfo: path = " << path << " => " << ok;
std::move(callback).Run(ok ? std::make_optional(file_info) : std::nullopt);
}
void EnumerateFiles(
const base::FilePath& path,
mojo::PendingReceiver<network::mojom::FileEnumerator> receiver) override {
if (!IsValid(path, "EnumerateFiles")) {
return;
}
DVLOG(1) << "EnumerateFiles: path = " << path;
mojo::MakeSelfOwnedReceiver(std::make_unique<FileEnumerator>(path),
std::move(receiver));
}
void CleanupDirectory(const base::FilePath& path,
CleanupDirectoryCallback callback) override {
if (!IsValid(path, "CleanupDirectory")) {
std::move(callback).Run(false);
return;
}
disk_cache::CleanupDirectory(path, std::move(callback));
}
private:
bool IsValid(const base::FilePath& path, std::string_view tag) const {
if (!path.IsAbsolute()) {
mojo::ReportBadMessage(static_cast<std::string>(tag) +
": The path is not an absolute path.");
return false;
}
if (path_ != path && !path_.IsParent(path)) {
mojo::ReportBadMessage(static_cast<std::string>(tag) +
": The path is not in the specified area.");
return false;
}
if (path.ReferencesParent()) {
mojo::ReportBadMessage(
static_cast<std::string>(tag) +
": The path contains a parent directory traversal attempt.");
return false;
}
return true;
}
const base::FilePath path_;
};
} // namespace
HttpCacheBackendFileOperationsFactory::HttpCacheBackendFileOperationsFactory(
const base::FilePath& path)
: path_(path) {}
HttpCacheBackendFileOperationsFactory::
~HttpCacheBackendFileOperationsFactory() = default;
void HttpCacheBackendFileOperationsFactory::Create(
mojo::PendingReceiver<network::mojom::HttpCacheBackendFileOperations>
receiver) {
auto task_runner = base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(), base::TaskPriority::USER_BLOCKING,
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN});
task_runner->PostTask(
FROM_HERE,
base::BindOnce(
[](mojo::PendingReceiver<
network::mojom::HttpCacheBackendFileOperations> receiver,
const base::FilePath& path) {
mojo::MakeSelfOwnedReceiver(
std::make_unique<HttpCacheBackendFileOperations>(path),
std::move(receiver), nullptr);
},
std::move(receiver), path_));
}
} // namespace content