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package com.docusign.esign.client.auth;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTCreator;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTCreationException;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.StringReader;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Date;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
/** JWTUtils class. */
public class JWTUtils {
/**
* Helper method to create a JWT token for the JWT flow.
*
* @param rsaPrivateKey the byte contents of the RSA private key
* @param oAuthBasePath DocuSign OAuth base path (account-d.docusign.com for the developer sandbox
* and account.docusign.com for the production platform)
* @param clientId DocuSign OAuth Client Id (AKA Integrator Key)
* @param userId DocuSign user Id to be impersonated (This is a UUID)
* @param expiresIn number of seconds remaining before the JWT assertion is considered as invalid
* @param scopes space-separated string that represents the list of scopes to grant to the OAuth
* token.
* @return a fresh JWT token
* @throws IllegalArgumentException if one of the arguments is invalid
* @throws JWTCreationException if not able to create a JWT token from the input parameters
* @throws IOException if there is an issue with either the public or private file
*/
public static String generateJWTAssertionFromByteArray(
byte[] rsaPrivateKey,
String oAuthBasePath,
String clientId,
String userId,
long expiresIn,
String scopes)
throws IllegalArgumentException, JWTCreationException, IOException {
if (expiresIn <= 0L) {
throw new IllegalArgumentException("expiresIn should be a non-negative value");
}
if (rsaPrivateKey == null || rsaPrivateKey.length == 0) {
throw new IllegalArgumentException("rsaPrivateKey byte array is empty");
}
if (oAuthBasePath == null
|| "".equals(oAuthBasePath)
|| clientId == null
|| "".equals(clientId)) {
throw new IllegalArgumentException("One of the arguments is null or empty");
}
RSAPrivateKey privateKey = readPrivateKeyFromByteArray(rsaPrivateKey, "RSA");
Algorithm algorithm = Algorithm.RSA256(null, privateKey);
long now = System.currentTimeMillis();
JWTCreator.Builder builder =
JWT.create()
.withIssuer(clientId)
.withAudience(oAuthBasePath)
.withIssuedAt(new Date(now))
.withClaim("scope", scopes)
.withExpiresAt(new Date(now + expiresIn * 1000));
if (userId != null && userId != "") {
builder = builder.withSubject(userId);
}
return builder.sign(algorithm);
}
/**
* Helper method to create a JWT token for the JWT flow.
*
* @param publicKeyFilename the filename of the RSA public key
* @param privateKeyFilename the filename of the RSA private key
* @param oAuthBasePath DocuSign OAuth base path (account-d.docusign.com for the developer sandbox
* and account.docusign.com for the production platform)
* @param clientId DocuSign OAuth Client Id (AKA Integrator Key)
* @param userId DocuSign user Id to be impersonated (This is a UUID)
* @param expiresIn number of seconds remaining before the JWT assertion is considered as invalid
* @return a fresh JWT token
* @throws JWTCreationException if not able to create a JWT token from the input parameters
* @throws IOException if there is an issue with either the public or private file
*/
public static String generateJWTAssertion(
String publicKeyFilename,
String privateKeyFilename,
String oAuthBasePath,
String clientId,
String userId,
long expiresIn)
throws JWTCreationException, IOException {
String token = null;
if (expiresIn <= 0L) {
throw new IllegalArgumentException("expiresIn should be a non-negative value");
}
if (publicKeyFilename == null
|| "".equals(publicKeyFilename)
|| privateKeyFilename == null
|| "".equals(privateKeyFilename)
|| oAuthBasePath == null
|| "".equals(oAuthBasePath)
|| clientId == null
|| "".equals(clientId)
|| userId == null
|| "".equals(userId)) {
throw new IllegalArgumentException("One of the arguments is null or empty");
}
try {
RSAPublicKey publicKey = readPublicKeyFromFile(publicKeyFilename, "RSA");
RSAPrivateKey privateKey = readPrivateKeyFromFile(privateKeyFilename, "RSA");
Algorithm algorithm = Algorithm.RSA256(publicKey, privateKey);
long now = System.currentTimeMillis();
token =
JWT.create()
.withIssuer(clientId)
.withSubject(userId)
.withAudience(oAuthBasePath)
.withNotBefore(new Date(now))
.withExpiresAt(new Date(now + expiresIn * 1000))
.withClaim("scope", "signature")
.sign(algorithm);
} catch (JWTCreationException e) {
throw e;
} catch (IOException e) {
throw e;
}
return token;
}
private static RSAPublicKey readPublicKeyFromFile(String filepath, String algorithm)
throws IOException {
File pemFile = new File(filepath);
if (!pemFile.isFile() || !pemFile.exists()) {
throw new FileNotFoundException(
String.format("The file '%s' doesn't exist.", pemFile.getAbsolutePath()));
}
PemReader reader = new PemReader(new FileReader(pemFile));
try {
PemObject pemObject = reader.readPemObject();
byte[] bytes = pemObject.getContent();
RSAPublicKey publicKey = null;
try {
KeyFactory kf = KeyFactory.getInstance(algorithm);
EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
publicKey = (RSAPublicKey) kf.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println(
"Could not reconstruct the public key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the public key");
}
return publicKey;
} finally {
reader.close();
}
}
private static RSAPrivateKey readPrivateKeyFromFile(String filepath, String algorithm)
throws IOException {
File pemFile = new File(filepath);
if (!pemFile.isFile() || !pemFile.exists()) {
throw new FileNotFoundException(
String.format("The file '%s' doesn't exist.", pemFile.getAbsolutePath()));
}
PemReader reader = new PemReader(new FileReader(pemFile));
try {
PemObject pemObject = reader.readPemObject();
byte[] bytes = pemObject.getContent();
RSAPrivateKey privateKey = null;
try {
Security.addProvider(new BouncyCastleProvider());
KeyFactory kf = KeyFactory.getInstance(algorithm, "BC");
EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
privateKey = (RSAPrivateKey) kf.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println(
"Could not reconstruct the private key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the private key");
} catch (NoSuchProviderException e) {
System.out.println("Could not reconstruct the private key, invalid provider.");
}
return privateKey;
} finally {
reader.close();
}
}
private static RSAPrivateKey readPrivateKeyFromByteArray(byte[] privateKeyBytes, String algorithm)
throws IOException {
PemReader reader = new PemReader(new StringReader(new String(privateKeyBytes)));
try {
PemObject pemObject = reader.readPemObject();
byte[] bytes = pemObject.getContent();
RSAPrivateKey privateKey = null;
try {
Security.addProvider(new BouncyCastleProvider());
KeyFactory kf = KeyFactory.getInstance(algorithm, "BC");
EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
privateKey = (RSAPrivateKey) kf.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println(
"Could not reconstruct the private key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the private key");
} catch (NoSuchProviderException e) {
System.out.println("Could not reconstruct the private key, invalid provider.");
}
return privateKey;
} finally {
reader.close();
}
}
}
