/*
 * 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
 *
 *      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.
 */

package android.content.integrity;

import android.annotation.NonNull;
import android.annotation.SystemApi;
import android.annotation.SystemService;
import android.annotation.TestApi;
import android.content.Context;
import android.content.IntentSender;
import android.content.pm.ParceledListSlice;
import android.os.RemoteException;

import java.util.List;

/**
 * Class for pushing rules used to check the integrity of app installs.
 *
 * <p>Note: applications using methods of this class must be a system app and have their package
 * name whitelisted as an integrity rule provider. Otherwise a {@link SecurityException} will be
 * thrown.
 *
 * @hide
 */
@TestApi
@SystemApi
@SystemService(Context.APP_INTEGRITY_SERVICE)
public class AppIntegrityManager {

    /** The operation succeeded. */
    public static final int STATUS_SUCCESS = 0;

    /** The operation failed. */
    public static final int STATUS_FAILURE = 1;

    /**
     * Current status of an operation. Will be one of {@link #STATUS_SUCCESS}, {@link
     * #STATUS_FAILURE}.
     *
     * <p>More information about a status may be available through additional extras; see the
     * individual status documentation for details.
     *
     * @see android.content.Intent#getIntExtra(String, int)
     */
    public static final String EXTRA_STATUS = "android.content.integrity.extra.STATUS";

    IAppIntegrityManager mManager;

    /** @hide */
    public AppIntegrityManager(IAppIntegrityManager manager) {
        mManager = manager;
    }

    /**
     * Update the rules to evaluate during install time.
     *
     * @param updateRequest request containing the data of the rule set update
     * @param statusReceiver Called when the state of the session changes. Intents sent to this
     *     receiver contain {@link #EXTRA_STATUS}. Refer to the individual status codes on how to
     *     handle them.
     */
    public void updateRuleSet(
            @NonNull RuleSet updateRequest, @NonNull IntentSender statusReceiver) {
        try {
            mManager.updateRuleSet(
                    updateRequest.getVersion(),
                    new ParceledListSlice<>(updateRequest.getRules()),
                    statusReceiver);
        } catch (RemoteException e) {
            throw e.rethrowAsRuntimeException();
        }
    }

    /** Get the current version of the rule set. */
    @NonNull
    public String getCurrentRuleSetVersion() {
        try {
            return mManager.getCurrentRuleSetVersion();
        } catch (RemoteException e) {
            throw e.rethrowAsRuntimeException();
        }
    }

    /** Get the name of the package that provided the current rule set. */
    @NonNull
    public String getCurrentRuleSetProvider() {
        try {
            return mManager.getCurrentRuleSetProvider();
        } catch (RemoteException e) {
            throw e.rethrowAsRuntimeException();
        }
    }

    /**
     * Get current RuleSet on device.
     *
     * <p>Warning: this method is only used for tests.
     *
     * @hide
     */
    @TestApi
    @NonNull
    public RuleSet getCurrentRuleSet() {
        try {
            ParceledListSlice<Rule> rules = mManager.getCurrentRules();
            String version = mManager.getCurrentRuleSetVersion();
            return new RuleSet.Builder().setVersion(version).addRules(rules.getList()).build();
        } catch (RemoteException e) {
            throw e.rethrowAsRuntimeException();
        }
    }

    /**
     * Get the package names of all whitelisted rule providers.
     *
     * <p>Warning: this method is only used for tests.
     *
     * @hide
     */
    @TestApi
    @NonNull
    public List<String> getWhitelistedRuleProviders() {
        try {
            return mManager.getWhitelistedRuleProviders();
        } catch (RemoteException e) {
            throw e.rethrowAsRuntimeException();
        }
    }
}