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// 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 "ash/quick_pair/companion_app/companion_app_parser.h"
#include <optional>
#include <string_view>
#include "ash/quick_pair/common/device.h"
#include "ash/quick_pair/repository/fast_pair/device_metadata.h"
#include "ash/quick_pair/repository/fast_pair_repository.h"
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "components/cross_device/logging/logging.h"
namespace {
constexpr char kIntentKeyPrefix[] = "intent:";
constexpr char kIntentPrefix[] = "#Intent";
constexpr char kEndSuffix[] = "end";
constexpr char companionAppKey[] = "EXTRA_COMPANION_APP=";
} // namespace
namespace ash {
namespace quick_pair {
CompanionAppParser::CompanionAppParser() = default;
CompanionAppParser::~CompanionAppParser() = default;
void CompanionAppParser::GetAppPackageName(
scoped_refptr<Device> device,
base::OnceCallback<void(std::optional<std::string>)>
on_companion_app_parsed) {
const auto metadata_id = device->metadata_id();
FastPairRepository::Get()->GetDeviceMetadata(
metadata_id,
base::BindOnce(&CompanionAppParser::OnDeviceMetadataRetrieved,
weak_pointer_factory_.GetWeakPtr(), std::move(device),
std::move(on_companion_app_parsed)));
}
void CompanionAppParser::OnDeviceMetadataRetrieved(
scoped_refptr<Device> device,
base::OnceCallback<void(std::optional<std::string>)> callback,
DeviceMetadata* device_metadata,
bool retryable_err) {
if (!device_metadata)
return;
const std::string intent_uri_from_metadata =
device_metadata->GetDetails().intent_uri();
std::optional<std::string_view> remainder =
base::RemovePrefix(intent_uri_from_metadata, kIntentKeyPrefix);
if (!remainder) {
std::move(callback).Run(std::nullopt);
return;
}
std::move(callback).Run(GetCompanionAppExtra(std::string(*remainder)));
}
std::optional<std::string> CompanionAppParser::GetCompanionAppExtra(
const std::string& intent_as_string) {
// Here is an an example of what Intents look like
//
// #Intent;action=android.intent.action.MAIN;
// category=android.intent.category.LAUNCHER;
// component=package_name/activity;
// param1;param2;end
//
// They must always begin with "#Intent", have components be separated by ";"
// and end with "end"
const std::vector<std::string_view> parts = base::SplitStringPiece(
intent_as_string, ";", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
if (parts.size() < 2 || parts.front() != kIntentPrefix ||
parts.back() != kEndSuffix) {
CD_LOG(WARNING, Feature::FP)
<< "Failed to split intent " << intent_as_string << ".";
return std::nullopt;
}
for (size_t i = 1; i < parts.size() - 1; ++i) {
const size_t separator = parts[i].find('=');
if (separator == std::string::npos) {
if (parts[i].empty()) {
// Intent should not have empty param. The empty param would appear in
// intent string as ';;'. In the last case it would cause error in
// Android framework. Such intents must not appear in the system.
CD_LOG(WARNING, Feature::FP)
<< "Found empty param in " << intent_as_string << ".";
return std::nullopt;
}
continue;
}
}
// Devices with companion apps always have a key in their intent uri titled:
// "EXTRA_COMPANION_APP", with the name of that app stored as the value
size_t companionAppIndex = intent_as_string.find(companionAppKey);
if (companionAppIndex == std::string::npos) {
return std::nullopt;
}
std::string companionAppId =
intent_as_string.substr(companionAppIndex + strlen(companionAppKey));
return companionAppId.substr(0, companionAppId.find(';'));
}
} // namespace quick_pair
} // namespace ash
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