Github user alopresto commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/695#discussion_r73251864
  
    --- Diff: 
nifi-toolkit/nifi-toolkit-tls/src/main/java/org/apache/nifi/toolkit/tls/standalone/TlsToolkitStandalone.java
 ---
    @@ -0,0 +1,101 @@
    +/*
    + * 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.nifi.toolkit.tls.standalone;
    +
    +import org.apache.nifi.security.util.CertificateUtils;
    +import org.apache.nifi.toolkit.tls.configuration.TlsClientConfig;
    +import org.apache.nifi.toolkit.tls.configuration.TlsConfig;
    +import org.apache.nifi.toolkit.tls.manager.TlsCertificateAuthorityManager;
    +import org.apache.nifi.toolkit.tls.manager.TlsClientManager;
    +import 
org.apache.nifi.toolkit.tls.manager.writer.NifiPropertiesTlsClientConfigWriter;
    +import org.apache.nifi.toolkit.tls.properties.NiFiPropertiesWriterFactory;
    +import org.apache.nifi.toolkit.tls.util.OutputStreamFactory;
    +import org.apache.nifi.toolkit.tls.util.TlsHelper;
    +import org.bouncycastle.openssl.jcajce.JcaMiscPEMGenerator;
    +import org.bouncycastle.util.io.pem.PemWriter;
    +
    +import java.io.File;
    +import java.io.FileOutputStream;
    +import java.io.IOException;
    +import java.io.OutputStreamWriter;
    +import java.security.GeneralSecurityException;
    +import java.security.KeyPair;
    +import java.security.KeyStore;
    +import java.security.cert.X509Certificate;
    +import java.util.List;
    +
    +public class TlsToolkitStandalone {
    +    public static final String NIFI_KEY = "nifi-key";
    +    public static final String NIFI_CERT = "nifi-cert";
    +    public static final String ROOT_CERT_PRIVATE_KEY = "rootCert.key";
    +    public static final String ROOT_CERT_CRT = "rootCert.crt";
    +    public static final String NIFI_PROPERTIES = "nifi.properties";
    +
    +    private final OutputStreamFactory outputStreamFactory;
    +
    +    public TlsToolkitStandalone() {
    +        this(FileOutputStream::new);
    +    }
    +
    +    public TlsToolkitStandalone(OutputStreamFactory outputStreamFactory) {
    +        this.outputStreamFactory = outputStreamFactory;
    +    }
    +
    +    public void createNifiKeystoresAndTrustStores(File baseDir, TlsConfig 
tlsConfig, NiFiPropertiesWriterFactory niFiPropertiesWriterFactory, 
List<String> hostnames, List<String> keyStorePasswords,
    +                                                  List<String> 
keyPasswords, List<String> trustStorePasswords, String httpsPort) throws 
GeneralSecurityException, IOException {
    +        String signingAlgorithm = tlsConfig.getSigningAlgorithm();
    +        int days = tlsConfig.getDays();
    +        String keyPairAlgorithm = tlsConfig.getKeyPairAlgorithm();
    +        int keySize = tlsConfig.getKeySize();
    +        TlsCertificateAuthorityManager tlsCertificateAuthorityManager = 
new TlsCertificateAuthorityManager(tlsConfig);
    +        KeyStore.PrivateKeyEntry privateKeyEntry = 
tlsCertificateAuthorityManager.getOrGenerateCertificateAuthority();
    +        X509Certificate certificate = (X509Certificate) 
privateKeyEntry.getCertificateChain()[0];
    +        KeyPair caKeyPair = new KeyPair(certificate.getPublicKey(), 
privateKeyEntry.getPrivateKey());
    +
    +        try (PemWriter pemWriter = new PemWriter(new 
OutputStreamWriter(outputStreamFactory.create(new File(baseDir, 
ROOT_CERT_CRT))))) {
    +            pemWriter.writeObject(new JcaMiscPEMGenerator(certificate));
    +        }
    +
    +        try (PemWriter pemWriter = new PemWriter(new 
OutputStreamWriter(outputStreamFactory.create(new File(baseDir, 
ROOT_CERT_PRIVATE_KEY))))) {
    +            pemWriter.writeObject(new JcaMiscPEMGenerator(caKeyPair));
    +        }
    +
    +        for (int i = 0; i < hostnames.size(); i++) {
    +            String hostname = hostnames.get(i);
    +            File hostDir = new File(baseDir, hostname);
    +
    +            if (!hostDir.mkdirs()) {
    --- End diff --
    
    If the directory already exists, this will return `false` and throw an 
exception. Check if the directory exists and either log a warning before 
clearing it, or skip generating that hostname's directory. 
    
    Example:
    
    ```bash
    
hw12203:...assembly/target/nifi-toolkit-1.0.0-SNAPSHOT-bin/nifi-toolkit-1.0.0-SNAPSHOT
 (pr695) alopresto
    🔓 355s @ 15:34:06 $ ./bin/tls-toolkit.sh standalone -n host1, host2
    
hw12203:...assembly/target/nifi-toolkit-1.0.0-SNAPSHOT-bin/nifi-toolkit-1.0.0-SNAPSHOT
 (pr695) alopresto
    🔓 15s @ 15:34:22 $ tree
    .
    ├── host1
    │   ├── keystore.jks
    │   ├── nifi.properties
    │   └── truststore.jks
    ├── localhost
    │   ├── keystore.jks
    │   ├── nifi.properties
    │   └── truststore.jks
    ├── rootCert.crt
    └── rootCert.key
    
    5 directories, 37 files
    
hw12203:...assembly/target/nifi-toolkit-1.0.0-SNAPSHOT-bin/nifi-toolkit-1.0.0-SNAPSHOT
 (pr695) alopresto
    🔓 65s @ 15:35:31 $ ./bin/tls-toolkit.sh standalone -n host1,host2
    Error creating generating tls configuration. (Unable to make directory: 
/Users/alopresto/Workspace/nifi/nifi-toolkit/nifi-toolkit-assembly/target/nifi-toolkit-1.0.0-SNAPSHOT-bin/nifi-toolkit-1.0.0-SNAPSHOT/./host1)
    ```


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