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A web service test double for all occasions

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/*
 * Copyright (C) 2019-2023 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.admin.tasks;

import static java.net.HttpURLConnection.HTTP_INTERNAL_ERROR;
import static java.net.HttpURLConnection.HTTP_OK;

import com.github.tomakehurst.wiremock.admin.AdminTask;
import com.github.tomakehurst.wiremock.client.ResponseDefinitionBuilder;
import com.github.tomakehurst.wiremock.common.BrowserProxySettings;
import com.github.tomakehurst.wiremock.common.ssl.KeyStoreSettings;
import com.github.tomakehurst.wiremock.common.url.PathParams;
import com.github.tomakehurst.wiremock.core.Admin;
import com.github.tomakehurst.wiremock.http.ResponseDefinition;
import com.github.tomakehurst.wiremock.http.ssl.X509KeyStore;
import com.github.tomakehurst.wiremock.stubbing.ServeEvent;
import java.security.cert.X509Certificate;
import java.util.Base64;

public class GetCaCertTask implements AdminTask {

  private static final Base64.Encoder BASE64_ENCODER =
      Base64.getMimeEncoder(64, new byte[] {'\r', '\n'});

  @Override
  public ResponseDefinition execute(Admin admin, ServeEvent serveEvent, PathParams pathParams) {
    BrowserProxySettings browserProxySettings = admin.getOptions().browserProxySettings();
    KeyStoreSettings caKeyStore = browserProxySettings.caKeyStore();
    try {
      X509KeyStore x509KeyStore =
          new X509KeyStore(caKeyStore.loadStore(), caKeyStore.password().toCharArray());
      X509Certificate certificate = x509KeyStore.getCertificateAuthority().certificateChain()[0];
      return new ResponseDefinitionBuilder()
          .withStatus(HTTP_OK)
          .withHeader("Content-Type", "application/x-pem-file")
          .withBody(
              "-----BEGIN CERTIFICATE-----\r\n"
                  + BASE64_ENCODER.encodeToString(certificate.getEncoded())
                  + "\r\n"
                  + "-----END CERTIFICATE-----")
          .build();
    } catch (Exception e) {
      String message = "Failed to export certificate authority cert from " + caKeyStore.path();
      admin.getOptions().notifier().error(message, e);
      return new ResponseDefinition(HTTP_INTERNAL_ERROR, message);
    }
  }
}