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/*
*
* Copyright (c) 2022. Deutsche Telekom AG
*
* 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.
*
* SPDX-License-Identifier: Apache-2.0
*
*
*/
package org.onap.portal.prefs;
import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.util.Date;
import java.util.UUID;
import com.nimbusds.jose.JOSEObjectType;
import com.nimbusds.jose.JWSAlgorithm;
import com.nimbusds.jose.JWSHeader;
import com.nimbusds.jose.JWSSigner;
import com.nimbusds.jose.crypto.RSASSASigner;
import com.nimbusds.jose.jwk.JWKSet;
import com.nimbusds.jose.jwk.KeyUse;
import com.nimbusds.jose.jwk.RSAKey;
import com.nimbusds.jose.jwk.gen.RSAKeyGenerator;
import com.nimbusds.jwt.JWTClaimsSet;
import com.nimbusds.jwt.SignedJWT;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import io.vavr.collection.List;
import lombok.Builder;
import lombok.Getter;
import lombok.NonNull;
@Component
public class TokenGenerator {
private static final String ROLES_CLAIM = "roles";
private static final String USERID_CLAIM = "sub";
private final Clock clock;
private final RSAKey jwk;
private final JWKSet jwkSet;
private final JWSSigner signer;
@Autowired
public TokenGenerator(Clock clock) {
try {
this.clock = clock;
jwk =
new RSAKeyGenerator(2048)
.keyUse(KeyUse.SIGNATURE)
.keyID(UUID.randomUUID().toString())
.generate();
jwkSet = new JWKSet(jwk);
signer = new RSASSASigner(jwk);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public JWKSet getJwkSet() {
return jwkSet;
}
public String generateToken(TokenGeneratorConfig config) {
final Instant iat = clock.instant();
final Instant exp = iat.plus(config.expireIn);
final JWTClaimsSet claims =
new JWTClaimsSet.Builder()
.jwtID(UUID.randomUUID().toString())
.subject(UUID.randomUUID().toString())
.issuer(config.issuer())
.issueTime(Date.from(iat))
.expirationTime(Date.from(exp))
.claim(ROLES_CLAIM, config.getRoles())
.claim(USERID_CLAIM, config.getSub())
.build();
final SignedJWT jwt =
new SignedJWT(
new JWSHeader.Builder(JWSAlgorithm.RS256)
.keyID(jwk.getKeyID())
.type(JOSEObjectType.JWT)
.build(),
claims);
try {
jwt.sign(signer);
} catch (Exception e) {
throw new RuntimeException(e);
}
return jwt.serialize();
}
@Getter
@Builder
public static class TokenGeneratorConfig {
private final int port;
@NonNull private final String sub;
@NonNull private final String realm;
@NonNull @Builder.Default private final Duration expireIn = Duration.ofMinutes(5);
@Builder.Default private final List<String> roles = List.empty();
public String issuer() {
return String.format("http://localhost:%d/auth/realms/%s", port, realm);
}
}
}
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