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/*
 * Licensed to Elasticsearch B.V. under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch B.V. licenses this file to you 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 co.elastic.apm.agent.sdk.internal.util;

import javax.annotation.Nullable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.ProxySelector;
import java.nio.file.Files;
import java.nio.file.Path;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.ProtectionDomain;
import java.util.Map;

/**
 * Delegates calls with wrapping in privileged actions which is required when security manager is active
 */
public class PrivilegedActionUtils {

    @Nullable
    public static String getEnv(final String key) {
        if (System.getSecurityManager() == null) {
            return System.getenv(key);
        }
        return AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public String run() {
                return System.getenv(key);
            }
        });
    }

    public static Map getEnv() {
        if (System.getSecurityManager() == null) {
            return System.getenv();
        }
        return AccessController.doPrivileged(new PrivilegedAction>() {
            @Override
            public Map run() {
                return System.getenv();
            }
        });
    }


    @Nullable
    public static String getProperty(final String name) {
        if (System.getSecurityManager() == null) {
            return System.getProperty(name);
        }

        return AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public String run() {
                return System.getProperty(name);
            }
        });
    }

    @Nullable
    public static ProxySelector getDefaultProxySelector() {
        if (System.getSecurityManager() == null) {
            return ProxySelector.getDefault();
        }

        return AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public ProxySelector run() {
                return ProxySelector.getDefault();
            }
        });
    }

    @Nullable
    public static ClassLoader getClassLoader(final Class type) {
        if (System.getSecurityManager() == null) {
            return type.getClassLoader();
        }
        return AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public ClassLoader run() {
                return type.getClassLoader();
            }
        });
    }

    public static ProtectionDomain getProtectionDomain(final Class type) {
        if (System.getSecurityManager() == null) {
            return type.getProtectionDomain();
        }
        return AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public ProtectionDomain run() {
                return type.getProtectionDomain();
            }
        });
    }

    @Nullable
    public static ClassLoader getContextClassLoader(final Thread t) {
        if (System.getSecurityManager() == null) {
            return t.getContextClassLoader();
        }
        return AccessController.doPrivileged(new PrivilegedAction() {
            @Override
            public ClassLoader run() {
                return t.getContextClassLoader();
            }
        });
    }

    public static void setContextClassLoader(final Thread t, final @Nullable ClassLoader cl) {
        if (System.getSecurityManager() == null) {
            t.setContextClassLoader(cl);
        }
        AccessController.doPrivileged(new PrivilegedAction