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* Copyright (C) 2019 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#pragma once
#include <string>
#include <unordered_map>
#include <vector>
#include "apex_file.h"
#include <android-base/result.h>
namespace android {
namespace apex {
// This class encapsulates pre-installed data for all the apexes on device.
// This data can be used to verify validity of an apex before trying to mount
// it.
// It's expected to have a single instance of this class in a process that
// mounts apexes (e.g. apexd, otapreopt_chroot).
class ApexPreinstalledData final {
// c-tor and d-tor are exposed for testing.
~ApexPreinstalledData() { data_.clear(); };
// Returns a singletone instance of this class.
static ApexPreinstalledData& GetInstance();
// Initializes instance by collecting pre-installed data from the given
// |dirs|.
// Note: this call is **not thread safe** and is expected to be performed in a
// single thread during initialization of apexd. After initialization is
// finished, all queries to the instance are thread safe.
android::base::Result<void> Initialize(const std::vector<std::string>& dirs);
// Returns trusted public key for an apex with the given |name|.
android::base::Result<const std::string> GetPublicKey(
const std::string& name) const;
// Returns path to the pre-installed version of an apex with the given |name|.
android::base::Result<const std::string> GetPreinstalledPath(
const std::string& name) const;
// Checks whether there is a pre-installed version of an apex with the given
// |name|.
bool HasPreInstalledVersion(const std::string& name) const;
// Checks if given |apex| is pre-installed.
bool IsPreInstalledApex(const ApexFile& apex) const;
// Non-copyable && non-moveable.
ApexPreinstalledData(const ApexPreinstalledData&) = delete;
ApexPreinstalledData& operator=(const ApexPreinstalledData&) = delete;
ApexPreinstalledData& operator=(ApexPreinstalledData&&) = delete;
ApexPreinstalledData(ApexPreinstalledData&&) = delete;
// Scans apexes in the given directory and adds collected data into |data_|.
android::base::Result<void> ScanDir(const std::string& dir);
// Internal struct to hold pre-installed data for the given apex.
struct ApexData {
// Public key of this apex.
std::string public_key;
// Path to the pre-installed version of this apex.
std::string path;
std::unordered_map<std::string, ApexData> data_;
} // namespace apex
} // namespace android