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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/file_system_access/file_system_access_observer_observation.h"
#include <memory>
#include <string>
#include <vector>
#include "base/files/file_path.h"
#include "base/functional/bind.h"
#include "build/buildflag.h"
#include "content/browser/file_system_access/file_system_access_directory_handle_impl.h"
#include "content/browser/file_system_access/file_system_access_file_handle_impl.h"
#include "content/browser/file_system_access/file_system_access_handle_base.h"
#include "content/browser/file_system_access/file_system_access_manager_impl.h"
#include "content/browser/file_system_access/file_system_access_observer_host.h"
#include "content/browser/file_system_access/file_system_access_transfer_token_impl.h"
#include "content/browser/file_system_access/file_system_access_watch_scope.h"
#include "content/browser/file_system_access/file_system_access_watcher_manager.h"
#include "content/public/browser/file_system_access_permission_context.h"
#include "storage/browser/file_system/file_system_context.h"
#include "storage/browser/file_system/file_system_url.h"
#include "third_party/blink/public/mojom/file_system_access/file_system_access_directory_handle.mojom.h"
#include "third_party/blink/public/mojom/file_system_access/file_system_access_observer.mojom.h"
#include "third_party/blink/public/mojom/permissions/permission_status.mojom-shared.h"
#if BUILDFLAG(IS_WIN)
#include "base/strings/utf_string_conversions.h"
#endif // BUILDFLAG(IS_WIN)
namespace content {
namespace {
FileSystemAccessPermissionContext::HandleType GetHandleType(
const absl::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>>&
handle) {
return absl::get_if<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>>(
&handle)
? FileSystemAccessPermissionContext::HandleType::kDirectory
: FileSystemAccessPermissionContext::HandleType::kFile;
}
FileSystemAccessHandleBase& AsHandleBase(
const absl::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>>&
handle) {
auto* dir_handle_ptr =
absl::get_if<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>>(
&handle);
if (dir_handle_ptr) {
return *static_cast<FileSystemAccessHandleBase*>(dir_handle_ptr->get());
}
return *absl::get<std::unique_ptr<FileSystemAccessFileHandleImpl>>(handle);
}
// TODO(https://crbug.com/1019297): Move this to a helper shared with
// `FileSystemAccessDirectoryHandleImpl`.
std::vector<std::string> GetRelativePathAsVectorOfStrings(
const base::FilePath& relative_path) {
CHECK(!relative_path.IsAbsolute());
CHECK(!relative_path.ReferencesParent());
std::vector<base::FilePath::StringType> components =
relative_path.GetComponents();
#if BUILDFLAG(IS_WIN)
std::vector<std::string> result;
result.reserve(components.size());
for (const auto& component : components) {
result.push_back(base::WideToUTF8(component));
}
return result;
#else
return components;
#endif // BUILDFLAG(IS_WIN)
}
} // namespace
FileSystemAccessObserverObservation::FileSystemAccessObserverObservation(
FileSystemAccessObserverHost* host,
std::unique_ptr<FileSystemAccessWatcherManager::Observation> observation,
mojo::PendingRemote<blink::mojom::FileSystemAccessObserver> remote,
absl::variant<std::unique_ptr<FileSystemAccessDirectoryHandleImpl>,
std::unique_ptr<FileSystemAccessFileHandleImpl>> handle)
: host_(host),
handle_(std::move(handle)),
observation_(std::move(observation)),
remote_(std::move(remote)) {
CHECK(host);
CHECK(observation_);
CHECK(observation_->scope().Contains(AsHandleBase(handle_).url()));
observation_->SetCallback(
base::BindRepeating(&FileSystemAccessObserverObservation::OnChanges,
weak_factory_.GetWeakPtr()));
// `base::Unretained` is safe here because this instance owns
// `remote_`.
remote_.set_disconnect_handler(
base::BindOnce(&FileSystemAccessObserverObservation::OnReceiverDisconnect,
base::Unretained(this)));
}
FileSystemAccessObserverObservation::~FileSystemAccessObserverObservation() =
default;
const storage::FileSystemURL& FileSystemAccessObserverObservation::handle_url()
const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return AsHandleBase(handle_).url();
}
void FileSystemAccessObserverObservation::OnChanges(
const std::list<FileSystemAccessWatcherManager::Observation::Change>&
changes) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
FileSystemAccessManagerImpl* manager = AsHandleBase(handle_).manager();
const FileSystemAccessManagerImpl::BindingContext& binding_context =
AsHandleBase(handle_).context();
const FileSystemAccessManagerImpl::SharedHandleState& handle_state =
AsHandleBase(handle_).handle_state();
const storage::FileSystemURL& handle_url = AsHandleBase(handle_).url();
// Do not relay changes if the site has lost read permission to the handle.
// TODO(https://crbug.com/1489035): Add tests for this.
if (handle_state.read_grant->GetStatus() !=
blink::mojom::PermissionStatus::GRANTED) {
// TODO(https://crbug.com/1489035): Proactively listen for permission
// changes, rather than (or perhaps in addition to) checking on each change.
return;
}
std::vector<blink::mojom::FileSystemAccessChangePtr> mojo_changes;
for (const auto& change : changes) {
if (change.error) {
// TODO(https://crbug.com/1019297): Consider destroying `observation_`...
// Or don't bother passing along errored changes from the WatcherManager
// to its Observations in the first place.
continue;
}
// TODO(https://crbug.com/1019297): Consider refactoring to keep the "scope"
// concept within the WatcherManager and its associated classes. This method
// just needs the root url.
//
// It is illegal to receive a change outside of the observed scope.
CHECK(observation_->scope().Contains(change.url));
blink::mojom::FileSystemAccessEntryPtr changed_entry, root_entry;
switch (GetHandleType(handle_)) {
// TODO(https://crbug.com/1425601): Don't assume the `HandleType` of the
// changed path is the same as `handle_`'s.
case FileSystemAccessPermissionContext::HandleType::kDirectory:
changed_entry = blink::mojom::FileSystemAccessEntry::New(
blink::mojom::FileSystemAccessHandle::NewDirectory(
manager->CreateDirectoryHandle(binding_context, change.url,
handle_state)),
change.url.virtual_path().BaseName().AsUTF8Unsafe());
root_entry = blink::mojom::FileSystemAccessEntry::New(
blink::mojom::FileSystemAccessHandle::NewDirectory(
manager->CreateDirectoryHandle(binding_context, handle_url,
handle_state)),
handle_url.virtual_path().BaseName().AsUTF8Unsafe());
break;
case FileSystemAccessPermissionContext::HandleType::kFile:
changed_entry = blink::mojom::FileSystemAccessEntry::New(
blink::mojom::FileSystemAccessHandle::NewFile(
manager->CreateFileHandle(binding_context, change.url,
handle_state)),
change.url.virtual_path().BaseName().AsUTF8Unsafe());
root_entry = blink::mojom::FileSystemAccessEntry::New(
blink::mojom::FileSystemAccessHandle::NewFile(
manager->CreateFileHandle(binding_context, handle_url,
handle_state)),
handle_url.virtual_path().BaseName().AsUTF8Unsafe());
break;
}
const base::FilePath& root_path = handle_url.path();
const base::FilePath& changed_path = change.url.path();
base::FilePath relative_path;
if (root_path.empty()) {
relative_path = changed_path;
} else if (root_path.IsParent(changed_path)) {
CHECK(root_path.AppendRelativePath(changed_path, &relative_path));
} else {
CHECK_EQ(root_path, changed_path);
}
mojo_changes.emplace_back(blink::mojom::FileSystemAccessChange::New(
blink::mojom::FileSystemAccessChangeMetadata::New(
std::move(root_entry), std::move(changed_entry),
GetRelativePathAsVectorOfStrings(relative_path)),
// TODO(https://crbug.com/1425601): Support change types.
blink::mojom::FileSystemAccessChangeType::NewModified(
blink::mojom::FileSystemAccessChangeTypeModified::New())));
}
remote_->OnFileChanges(std::move(mojo_changes));
}
void FileSystemAccessObserverObservation::OnReceiverDisconnect() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// Destroys `this`.
host_->RemoveObservation(this);
}
} // namespace content
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