content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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 org.apache.camel.quarkus.component.as2.it;
  
  import java.io.IOException;
  import java.math.BigInteger;
  import java.security.GeneralSecurityException;
  import java.security.KeyPair;
  import java.security.KeyPairGenerator;
  import java.security.PrivateKey;
  import java.security.PublicKey;
  import java.security.SecureRandom;
  import java.security.Security;
  import java.security.cert.Certificate;
  import java.security.cert.X509Certificate;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  
  import org.apache.camel.component.as2.api.AS2ServerConnection;
  import org.apache.camel.component.as2.api.AS2SignatureAlgorithm;
  import org.apache.hc.core5.http.ClassicHttpRequest;
  import org.apache.hc.core5.http.ClassicHttpResponse;
  import org.apache.hc.core5.http.HttpException;
  import org.apache.hc.core5.http.HttpRequest;
  import org.apache.hc.core5.http.HttpResponse;
  import org.apache.hc.core5.http.io.HttpRequestHandler;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.bouncycastle.asn1.x500.X500Name;
  import org.bouncycastle.asn1.x509.AuthorityKeyIdentifier;
  import org.bouncycastle.asn1.x509.Extension;
  import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
  import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
  import org.bouncycastle.cert.X509v3CertificateBuilder;
  import org.bouncycastle.cert.bc.BcX509ExtensionUtils;
  import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
  import org.bouncycastle.cert.jcajce.JcaX509v3CertificateBuilder;
  import org.bouncycastle.jce.provider.BouncyCastleProvider;
  import org.bouncycastle.operator.OperatorCreationException;
  import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
  
  public class As2Receiver {
      private static final String SERVER_FQDN = "server.example.com";
      private static final String ORIGIN_SERVER_NAME = "AS2ClientManagerIntegrationTest Server";
      private static final String MDN_MESSAGE_TEMPLATE = "TBD";
      private static AS2ServerConnection serverConnection;
      private static KeyPair serverSigningKP;
      private static List<X509Certificate> serverCertList;
      private static RequestHandler receiverHandler;
  
      private static KeyPair clientKeyPair;
      private static X509Certificate clientCert;
  
      // certificate serial number seed.
      private static int serialNo = 1;
  
      private As2Receiver() {
      }
  
      public static RequestHandler startReceiver(int port) throws Exception {
          if (receiverHandler == null) {
              setupServerKeysAndCertificates();
              setupClientKeysAndCertificates();
              receiverHandler = receiveTestMessages(port);
          }
          return receiverHandler;
      }
  
      private static void setupServerKeysAndCertificates() throws Exception {
          Security.addProvider(new BouncyCastleProvider());
  
          //
          // set up our certificates
          //
          KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "BC");
  
          kpg.initialize(1024, new SecureRandom());
  
          String issueDN = "O=Earth2 Software, C=E2";
          KeyPair issueKP = kpg.generateKeyPair();
          X509Certificate issueCert = makeCertificate(
                  issueKP, issueDN, issueKP, issueDN);
  
          //
          // certificate we sign against
          //
          String signingDN = "CN=Sheldon, E=test@gmail.com, O=Earth2 Software, C=E2";
          serverSigningKP = kpg.generateKeyPair();
          X509Certificate signingCert = makeCertificate(
                  serverSigningKP, signingDN, issueKP, issueDN);
  
          serverCertList = new ArrayList<>();
  
          serverCertList.add(signingCert);
          serverCertList.add(issueCert);
      }
  
      private static void setupClientKeysAndCertificates() throws Exception {
          //
          // set up our certificates
          //
          KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "BC");
  
          kpg.initialize(1024, new SecureRandom());
  
          String issueDN = "O=Punkhorn Software, C=US";
          KeyPair issueKP = kpg.generateKeyPair();
          X509Certificate issueCert = Utils.makeCertificate(
                  issueKP, issueDN, issueKP, issueDN);
  
          //
          // certificate we sign against
          //
          String signingDN = "CN=William J. Collins, E=punkhornsw@gmail.com, O=Punkhorn Software, C=US";
          clientKeyPair = kpg.generateKeyPair();
          clientCert = Utils.makeCertificate(clientKeyPair, signingDN, issueKP, issueDN);
      }
  
      private static RequestHandler receiveTestMessages(int port) throws IOException {
          // based on https://github.com/apache/camel/blob/camel-4.13.0/components/camel-as2/camel-as2-component/src/test/java/org/apache/camel/component/as2/AS2ClientManagerIT.java#L992C25-L992C44
          serverConnection = new AS2ServerConnection(As2Helper.AS2_VERSION, ORIGIN_SERVER_NAME,
                  SERVER_FQDN, port, AS2SignatureAlgorithm.SHA256WITHRSA,
                  serverCertList.toArray(new Certificate[0]), serverSigningKP.getPrivate(), null,
                  MDN_MESSAGE_TEMPLATE,
                  null, null,
                  null, null, null);
  
          RequestHandler handler = new RequestHandler();
          serverConnection.listen("/", handler);
  
          return handler;
      }
  
      /**
       * create a basic X509 certificate from the given keys
       */
      public static X509Certificate makeCertificate(KeyPair subKP, String subDN, KeyPair issKP, String issDN)
              throws GeneralSecurityException, IOException, OperatorCreationException {
          PublicKey subPub = subKP.getPublic();
          PrivateKey issPriv = issKP.getPrivate();
          PublicKey issPub = issKP.getPublic();
  
          X509v3CertificateBuilder v3CertGen = new JcaX509v3CertificateBuilder(new X500Name(issDN),
                  BigInteger.valueOf(serialNo++), new Date(System.currentTimeMillis()),
                  new Date(System.currentTimeMillis() + (1000L * 60 * 60 * 24 * 100)), new X500Name(subDN), subPub);
  
          v3CertGen.addExtension(Extension.subjectKeyIdentifier, false, createSubjectKeyId(subPub));
  
          v3CertGen.addExtension(Extension.authorityKeyIdentifier, false, createAuthorityKeyId(issPub));
  
          return new JcaX509CertificateConverter().setProvider("BC").getCertificate(
                  v3CertGen.build(new JcaContentSignerBuilder("MD5withRSA").setProvider("BC").build(issPriv)));
      }
  
      public static AuthorityKeyIdentifier createAuthorityKeyId(PublicKey pub) throws IOException {
          SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(pub.getEncoded());
  
          BcX509ExtensionUtils utils = new BcX509ExtensionUtils();
          return utils.createAuthorityKeyIdentifier(info);
      }
  
      public static SubjectKeyIdentifier createSubjectKeyId(PublicKey pub) throws IOException {
          SubjectPublicKeyInfo info = SubjectPublicKeyInfo.getInstance(pub.getEncoded());
  
          return new BcX509ExtensionUtils().createSubjectKeyIdentifier(info);
      }
  
      public static class RequestHandler implements HttpRequestHandler {
  
          private HttpRequest request;
          private HttpResponse response;
  
          @Override
          public void handle(ClassicHttpRequest request, ClassicHttpResponse response, HttpContext httpContext)
                  throws HttpException, IOException {
              this.request = request;
              this.response = response;
          }
  
          public HttpRequest getRequest() {
              return request;
          }
  
          public HttpResponse getResponse() {
              return response;
          }
      }
  }
  