services/core/java/com/android/server/pm/SharedUserSetting.java

/*
 * Copyright (C) 2011 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 com.android.server.pm;

import android.annotation.Nullable;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageParser;
import android.service.pm.PackageServiceDumpProto;
import android.util.ArraySet;
import android.util.proto.ProtoOutputStream;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

/**
 * Settings data for a particular shared user ID we know about.
 */
public final class SharedUserSetting extends SettingBase {
    final String name;

    int userId;

    // flags that are associated with this uid, regardless of any package flags
    int uidFlags;
    int uidPrivateFlags;

    final ArraySet<PackageSetting> packages = new ArraySet<PackageSetting>();

    final PackageSignatures signatures = new PackageSignatures();

    SharedUserSetting(String _name, int _pkgFlags, int _pkgPrivateFlags) {
        super(_pkgFlags, _pkgPrivateFlags);
        uidFlags =  _pkgFlags;
        uidPrivateFlags = _pkgPrivateFlags;
        name = _name;
    }

    @Override
    public String toString() {
        return "SharedUserSetting{" + Integer.toHexString(System.identityHashCode(this)) + " "
                + name + "/" + userId + "}";
    }

    public void writeToProto(ProtoOutputStream proto, long fieldId) {
        long token = proto.start(fieldId);
        proto.write(PackageServiceDumpProto.SharedUserProto.USER_ID, userId);
        proto.write(PackageServiceDumpProto.SharedUserProto.NAME, name);
        proto.end(token);
    }

    void removePackage(PackageSetting packageSetting) {
        if (packages.remove(packageSetting)) {
            // recalculate the pkgFlags for this shared user if needed
            if ((this.pkgFlags & packageSetting.pkgFlags) != 0) {
                int aggregatedFlags = uidFlags;
                for (PackageSetting ps : packages) {
                    aggregatedFlags |= ps.pkgFlags;
                }
                setFlags(aggregatedFlags);
            }
            if ((this.pkgPrivateFlags & packageSetting.pkgPrivateFlags) != 0) {
                int aggregatedPrivateFlags = uidPrivateFlags;
                for (PackageSetting ps : packages) {
                    aggregatedPrivateFlags |= ps.pkgPrivateFlags;
                }
                setPrivateFlags(aggregatedPrivateFlags);
            }
        }
    }

    void addPackage(PackageSetting packageSetting) {
        if (packages.add(packageSetting)) {
            setFlags(this.pkgFlags | packageSetting.pkgFlags);
            setPrivateFlags(this.pkgPrivateFlags | packageSetting.pkgPrivateFlags);
        }
    }

    public @Nullable List<PackageParser.Package> getPackages() {
        if (packages == null || packages.size() == 0) {
            return null;
        }
        final ArrayList<PackageParser.Package> pkgList = new ArrayList<>(packages.size());
        for (PackageSetting ps : packages) {
            if (ps == null) {
                continue;
            }
            pkgList.add(ps.pkg);
        }
        return pkgList;
    }

    public boolean isPrivileged() {
        return (this.pkgPrivateFlags & ApplicationInfo.PRIVATE_FLAG_PRIVILEGED) != 0;
    }
}