/*
 * Copyright (c) 2022-2024 Huawei Device Co., Ltd.
 * 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
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "permission_manager.h"

#include "accesstoken_kit.h"
#include "access_token.h"
#include "dm_log.h"
#include "hap_token_info.h"
#include "ipc_skeleton.h"
#include "native_token_info.h"
#include "securec.h"

using namespace OHOS::Security::AccessToken;

namespace OHOS {
namespace DistributedHardware {
IMPLEMENT_SINGLE_INSTANCE(PermissionManager);
constexpr int32_t DM_OK = 0;
constexpr int32_t ERR_DM_FAILED = -20000;
constexpr int32_t PKG_NAME_SIZE_MAX = 256;
namespace {
constexpr const char* DM_SERVICE_ACCESS_PERMISSION = "ohos.permission.ACCESS_SERVICE_DM";
constexpr const char* DM_SERVICE_ACCESS_NEWPERMISSION = "ohos.permission.DISTRIBUTED_DATASYNC";

#define AUTH_CODE_WHITE_LIST_NUM (2)
constexpr const static char g_authCodeWhiteList[AUTH_CODE_WHITE_LIST_NUM][PKG_NAME_SIZE_MAX] = {
    "com.huawei.msdp.hmringgenerator",
    "com.huawei.msdp.hmringdiscriminator",
};

#define PIN_HOLDER_WHITE_LIST_NUM (1)
constexpr const static char g_pinHolderWhiteList[PIN_HOLDER_WHITE_LIST_NUM][PKG_NAME_SIZE_MAX] = {
    "CollaborationFwk",
};
}

bool PermissionManager::CheckPermission(void)
{
    LOGI("Enter PermissionManager::CheckPermission");
    AccessTokenID tokenCaller = IPCSkeleton::GetCallingTokenID();
    if (tokenCaller == 0) {
        return false;
    }
    LOGI("PermissionManager::tokenCaller ID == %d", tokenCaller);

    ATokenTypeEnum tokenTypeFlag = AccessTokenKit::GetTokenTypeFlag(tokenCaller);
    if (tokenTypeFlag == ATokenTypeEnum::TOKEN_HAP || tokenTypeFlag == ATokenTypeEnum::TOKEN_NATIVE) {
        int32_t ret = AccessTokenKit::VerifyAccessToken(tokenCaller, DM_SERVICE_ACCESS_PERMISSION);
        if (ret == PermissionState::PERMISSION_GRANTED) {
            return true;
        }
    }
    LOGE("DM service access is denied, please apply for corresponding permissions");
    return false;
}

bool PermissionManager::CheckNewPermission(void)
{
    LOGI("Enter PermissionManager::CheckNewPermission");
    AccessTokenID tokenCaller = IPCSkeleton::GetCallingTokenID();
    if (tokenCaller == 0) {
        return false;
    }
    LOGI("PermissionManager::tokenCaller ID == %d", tokenCaller);

    ATokenTypeEnum tokenTypeFlag = AccessTokenKit::GetTokenTypeFlag(tokenCaller);
    if (tokenTypeFlag == ATokenTypeEnum::TOKEN_HAP || tokenTypeFlag == ATokenTypeEnum::TOKEN_NATIVE) {
        int32_t ret = AccessTokenKit::VerifyAccessToken(tokenCaller, DM_SERVICE_ACCESS_NEWPERMISSION);
        if (ret == PermissionState::PERMISSION_GRANTED) {
            return true;
        }
    }
    LOGE("DM service access is denied, please apply for corresponding new permissions");
    return false;
}

int32_t PermissionManager::GetCallerProcessName(std::string &processName)
{
    LOGI("Enter PermissionManager::GetCallerProcessName");
    AccessTokenID tokenCaller = IPCSkeleton::GetCallingTokenID();
    if (tokenCaller == 0) {
        return ERR_DM_FAILED;
    }
    LOGI("PermissionManager::tokenCaller ID == %d", tokenCaller);
    ATokenTypeEnum tokenTypeFlag = AccessTokenKit::GetTokenTypeFlag(tokenCaller);
    if (tokenTypeFlag == ATokenTypeEnum::TOKEN_HAP) {
        HapTokenInfo tokenInfo;
        if (AccessTokenKit::GetHapTokenInfo(tokenCaller, tokenInfo) != EOK) {
            LOGE("GetHapTokenInfo failed.");
            return ERR_DM_FAILED;
        }
        processName = std::move(tokenInfo.bundleName);
    } else if (tokenTypeFlag == ATokenTypeEnum::TOKEN_NATIVE) {
        NativeTokenInfo tokenInfo;
        if (AccessTokenKit::GetNativeTokenInfo(tokenCaller, tokenInfo) != EOK) {
            LOGE("GetNativeTokenInfo failed.");
            return ERR_DM_FAILED;
        }
        processName = std::move(tokenInfo.processName);
    } else {
        LOGE("GetCallerProcessName failed, unsupported process.");
        return ERR_DM_FAILED;
    }

    LOGI("Get process name: %s success.", processName.c_str());
    return DM_OK;
}

bool PermissionManager::CheckProcessNameValidOnAuthCode(const std::string &processName)
{
    LOGI("Enter PermissionManager::CheckProcessNameValidOnAuthCode");
    if (processName.empty()) {
        LOGE("ProcessName is empty");
        return false;
    }

    uint16_t index = 0;
    for (; index < AUTH_CODE_WHITE_LIST_NUM; ++index) {
        std::string tmp(g_authCodeWhiteList[index]);
        if (processName == tmp) {
            return true;
        }
    }

    LOGE("CheckProcessNameValidOnAuthCode process name: %s invalid.", processName.c_str());
    return false;
}

bool PermissionManager::CheckProcessNameValidOnPinHolder(const std::string &processName)
{
    LOGI("Enter PermissionManager::CheckProcessNameValidOnPinHolder");
    if (processName.empty()) {
        LOGE("ProcessName is empty");
        return false;
    }

    uint16_t index = 0;
    for (; index < PIN_HOLDER_WHITE_LIST_NUM; ++index) {
        std::string tmp(g_pinHolderWhiteList[index]);
        if (processName == tmp) {
            return true;
        }
    }

    LOGE("CheckProcessNameValidOnPinHolder process name: %s invalid.", processName.c_str());
    return false;
}
} // namespace DistributedHardware
} // namespace OHOS