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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/file_reader.h"
#include <algorithm>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/strings/strcat.h"
#include "base/task/single_thread_task_runner.h"
#include "extensions/browser/extension_file_task_runner.h"
FileReader::FileReader(std::vector<extensions::ExtensionResource> resources,
size_t max_resources_length,
OptionalFileSequenceTask optional_file_sequence_task,
DoneCallback done_callback)
: resources_(std::move(resources)),
max_resources_length_(max_resources_length),
optional_file_sequence_task_(std::move(optional_file_sequence_task)),
done_callback_(std::move(done_callback)),
origin_task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()) {}
void FileReader::Start() {
extensions::GetExtensionFileTaskRunner()->PostTask(
FROM_HERE, base::BindOnce(&FileReader::ReadFilesOnFileSequence, this));
}
FileReader::~FileReader() = default;
void FileReader::ReadFilesOnFileSequence() {
DCHECK(
extensions::GetExtensionFileTaskRunner()->RunsTasksInCurrentSequence());
std::vector<std::unique_ptr<std::string>> data;
data.reserve(resources_.size());
std::optional<std::string> error;
size_t remaining_length = max_resources_length_;
for (const auto& resource : resources_) {
data.push_back(std::make_unique<std::string>());
std::string* file_data = data.back().get();
bool success = base::ReadFileToStringWithMaxSize(
resource.GetFilePath(), file_data, remaining_length);
if (!success) {
// If `file_data` is non-empty, then the file length exceeded
// `max_resources_length_`. Otherwise, another error was encountered when
// attempting to read the file.
error = base::StrCat(
{"Could not load file: '", resource.relative_path().AsUTF8Unsafe(),
"'.", file_data->empty() ? "" : " Resource size exceeded."});
// Clear `data` to avoid passing a partial result.
data.clear();
break;
}
remaining_length -= file_data->size();
if (optional_file_sequence_task_) {
optional_file_sequence_task_.Run(file_data);
}
}
// Release any potentially-bound references from the file sequence task.
optional_file_sequence_task_.Reset();
origin_task_runner_->PostTask(
FROM_HERE, base::BindOnce(std::move(done_callback_), std::move(data),
std::move(error)));
}
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