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A library for processing verifiable credentials
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/*
 * ******************************************************************************
 * Copyright (c) 2021,2024 Contributors to the Eclipse Foundation
 *
 * See the NOTICE file(s) distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://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.
 *
 * SPDX-License-Identifier: Apache-2.0
 * *******************************************************************************
 */

package org.eclipse.tractusx.ssi.examples;

import com.nimbusds.jose.jwk.Curve;
import com.nimbusds.jose.jwk.OctetKeyPair;
import com.nimbusds.jose.jwk.gen.OctetKeyPairGenerator;
import java.util.ArrayList;
import java.util.List;
import lombok.SneakyThrows;
import org.eclipse.tractusx.ssi.lib.crypt.IPrivateKey;
import org.eclipse.tractusx.ssi.lib.crypt.IPublicKey;
import org.eclipse.tractusx.ssi.lib.crypt.jwk.JsonWebKey;
import org.eclipse.tractusx.ssi.lib.crypt.x25519.X25519PrivateKey;
import org.eclipse.tractusx.ssi.lib.crypt.x25519.X25519PublicKey;
import org.eclipse.tractusx.ssi.lib.did.web.DidWebFactory;
import org.eclipse.tractusx.ssi.lib.model.did.Did;
import org.eclipse.tractusx.ssi.lib.model.did.DidDocument;
import org.eclipse.tractusx.ssi.lib.model.did.DidDocumentBuilder;
import org.eclipse.tractusx.ssi.lib.model.did.JWKVerificationMethod;
import org.eclipse.tractusx.ssi.lib.model.did.JWKVerificationMethodBuilder;
import org.eclipse.tractusx.ssi.lib.model.did.VerificationMethod;

/** This is example class to demonstrate how to create @{@link DidDocument} using Json web key */
public class BuildDIDDocJsonWebKey2020 {

  private BuildDIDDocJsonWebKey2020() {
    throw new IllegalStateException("Example class");
  }

  /**
   * Build did document.
   *
   * @param hostName the host name
   * @return the did document
   */
  @SneakyThrows
  public static DidDocument buildDidDocument(String hostName) {
    // Building DID and Key
    final Did did = DidWebFactory.fromHostname(hostName);
    OctetKeyPair octetKeyPair = new OctetKeyPairGenerator(Curve.Ed25519).keyID("1").generate();

    IPrivateKey privateKey = new X25519PrivateKey(octetKeyPair.getDecodedD());
    IPublicKey publicKey = new X25519PublicKey(octetKeyPair.getDecodedX());

    // JWK
    JsonWebKey jwk = new JsonWebKey(octetKeyPair.getKeyID(), publicKey, privateKey);

    // Building Verification Methods:
    final List verificationMethods = new ArrayList<>();
    final JWKVerificationMethodBuilder builder = new JWKVerificationMethodBuilder();
    final JWKVerificationMethod key = builder.did(did).jwk(jwk).build();
    verificationMethods.add(key);

    final DidDocumentBuilder didDocumentBuilder = new DidDocumentBuilder();
    didDocumentBuilder.id(did.toUri());
    didDocumentBuilder.verificationMethods(verificationMethods);

    return didDocumentBuilder.build();
  }
}