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A web service test double for all occasions - standalone edition

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/*
 * Copyright (C) 2021 Thomas Akehurst
 *
 * 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.github.tomakehurst.wiremock.http;

import static java.util.Arrays.asList;

import com.github.tomakehurst.wiremock.WireMockServer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class JvmProxyConfigurer {

  private static final String HTTP_PROXY_HOST = "http.proxyHost";
  private static final String HTTP_PROXY_PORT = "http.proxyPort";
  private static final String HTTPS_PROXY_HOST = "https.proxyHost";
  private static final String HTTPS_PROXY_PORT = "https.proxyPort";
  private static final String HTTP_NON_PROXY_HOSTS = "http.nonProxyHosts";
  private static final List ALL_PROXY_SETTINGS =
      asList(
          HTTP_PROXY_HOST,
          HTTP_PROXY_PORT,
          HTTPS_PROXY_HOST,
          HTTPS_PROXY_PORT,
          HTTP_NON_PROXY_HOSTS);

  private static final Map previousSettings = new HashMap<>();

  public static void configureFor(WireMockServer wireMockServer) {
    stashPreviousSettings();

    configureFor(wireMockServer.port());
  }

  public static void configureFor(int port) {
    System.setProperty(HTTP_PROXY_HOST, "localhost");
    System.setProperty(HTTP_PROXY_PORT, String.valueOf(port));
    System.setProperty(HTTPS_PROXY_HOST, "localhost");
    System.setProperty(HTTPS_PROXY_PORT, String.valueOf(port));
    System.setProperty(HTTP_NON_PROXY_HOSTS, "localhost|127.*|[::1]");
  }

  public static void restorePrevious() {
    ALL_PROXY_SETTINGS.forEach(
        key -> {
          final String previous = previousSettings.get(key);
          if (previous == null) {
            System.clearProperty(key);
          } else {
            System.setProperty(key, previous);
          }
        });
  }

  private static void stashPreviousSettings() {
    ALL_PROXY_SETTINGS.forEach(key -> previousSettings.put(key, System.getProperty(key)));
  }
}