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/*
* Copyright (C) 2008-2020, Juick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.github.scribejava.apis;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.nio.charset.StandardCharsets;
import java.security.Key;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.util.Base64;
import java.util.Date;
public class AppleClientSecretGenerator {
private final String subject;
private final String teamId;
private final String keyId;
private final Key signingKey;
private final byte[] pemData;
public AppleClientSecretGenerator(final String subject, final String teamId, final String keyId, final byte[] pemData)
throws NoSuchAlgorithmException, InvalidKeySpecException {
this.subject = subject;
this.keyId = keyId;
this.teamId = teamId;
this.pemData = pemData;
String p8encodedData = new String(getPemData(), StandardCharsets.UTF_8)
.replace(
"-----BEGIN PRIVATE KEY-----\n", "")
.replace("\n", "")
.replace("-----END PRIVATE KEY-----", "");
KeyFactory kf = KeyFactory.getInstance("EC");
EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(p8encodedData));
signingKey = kf.generatePrivate(keySpec);
}
public String getClientSecret() {
Instant now = Instant.now();
return Jwts.builder()
.setHeaderParam("kid", keyId)
.setIssuer(teamId)
.setAudience("https://appleid.apple.com")
.setIssuedAt(Date.from(now))
.setSubject(subject)
.setExpiration(Date.from(ZonedDateTime.ofInstant(now, ZoneId.of("UTC")).plusMonths(1).toInstant()))
.signWith(signingKey, SignatureAlgorithm.ES256)
.compact();
}
public String getTeamId() {
return teamId;
}
public String getKeyId() {
return keyId;
}
public String getApplicationId() {
return subject;
}
public byte[] getPemData() {
return pemData;
}
}
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