Zuul Spring Client

This project provides Spring helpers and namespaces for integrating with the web services provided by the Zuul Project.

Starting with v 1.4 of the zuul-spring-client, the namespace has been refactored to allow for PGP and PBE key configuration. The older versions will still work but do not support PGP.

Maven Dependency

<groupId>org.devnull</groupId>
<artifactId>zuul-spring-client</artifactId>
<version>1.5.1</version>

Download Jar

Simple Usage Example

context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:zuul="http://www.devnull.org/schema/zuul-spring-client"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.devnull.org/schema/zuul-spring-client http://www.devnull.org/schema/zuul-spring-client.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">


    <context:property-placeholder properties-ref="appDataConfig"/>
    <zuul:properties id="appDataConfig" config="app-data-config" environment="prod">
        <zuul:file-store/>
        <zuul:pbe-decryptor password="secret" algorithm="PBEWITHSHA256AND128BITAES-CBC-BC"/>
        <!-- or use the pgp decryptor
           <zuul:pgp-decryptor password="#{environment['GNUPGPASSWD']}" secret-key-ring="#{environment['GNUPGHOME']}/secring.gpg"/>
        -->
    </zuul:properties>
</beans>

Dynamic Configuration of Environment, etc.

Spring Profiles

Utilize spring profiles to enable configuration by profile.

    <beans profile="prod">
        <context:property-placeholder properties-ref="appDataConfig"/>
        <zuul:properties id="appDataConfig" host="zuul.acme.com" config="foo-config" environment="prod">
            <zuul:pbe-decryptor algorithm="PBEWITHSHA256AND128BITAES-CBC-BC" password="I like cake!"/>
        </zuul:properties>
    </beans>
    <beans profile="qa">
        <context:property-placeholder properties-ref="appDataConfig"/>
        <zuul:properties id="appDataConfig" host="zuul.acme.com" config="foo-config"environment="qa"/>
    </beans>
    <beans profile="dev">
        <context:property-placeholder properties-ref="appDataConfig"/>
        <zuul:properties id="appDataConfig" host="zuul.acme.com" config="foo-config" environment="dev"/>
    </beans>

Spring Expression Language

Use environment variables to read in the password and environment:

    <context:property-placeholder properties-ref="appDataConfig"/>
    <zuul:properties id="appDataConfig" config="app-data-config" environment="#{environment['ZUUL_ENVIRONMENT']}">
        <zuul:file-store/>
        <zuul:pbe-decryptor password="#{environment['ZUUL_PASSWORD']}" algorithm="PBEWITHSHA256AND128BITAES-CBC-BC"/>
    </zuul:properties>

Spring Namespace Reference

zuul:properties

Attribute	Description	Default	Required
config	Name of the configuration to render	n/a	true
host	DNS or IP address of the zuul server	localhost	false
port	TCP port where the server is running	80	false
context	URI path to the root zuul application	/zuul	false
environment	Which environment set to retrieve	dev	false
ssl	Set to true if zuul endpoints are hosted via HTTPS	false	false
http-client-ref	Reference to a custom httpcomponents http-client	A default client is created by default. You can override if needed	false

---

zuul:file-store

The zuul:file-store element is optional. It caches copies of the files (with encrypted values) to the local filesystem. If configured, it will be used as a backup strategy if the zuul web services are unavailable.

If left un-configured, the application will throw an exception upon startup if the service is not available.

Attribute	Description	Default	Required
path	File Resource to contain the cached files.	Uses the java.io.tmp system property by default	false

---

• zuul:pbe-decryptor

Use this option if your configuration in Zuul has encrypted values from a PBE (password base encryption) key such as AES, TripleDES, etc.

Attribute	Description	Default	Required
algorithm	Provide an encryption algorithm which matches the Zuul key. Available values: PBEWITHSHA256AND128BITAES-CBC-BC (AES Bouncy Castle) PBEWithSHAAnd2-KeyTripleDES-CBC (Triple DES Bouncy Castle) PBEWithMD5AndTripleDES (Triple DES JCE) PBEWithMD5AndDES (DES JCE) See the following for more information: Jasypt Documentation Zuul Encryption Documentation	null	true
password	Shared, private password used to decrypt the values	null	true

---

• zuul:pgp-decryptor

Use this option if your configuration in Zuul has encrypted values from a PGP key.

Attribute	Description	Default	Required
secretKeyRing	File resource representing the PGP secret key ring (secring.gpg)	null	true
password	Password used to unlock the secret key ring (if encrypted)	empty	false

---

Using Without Spring

Eventually, I'll separate out the code for a POJO client. Until then, you can utilze the decryption functionality directly from the PropertyDecryptor interfaces.

• org.devnull.client.spring.crypto.PropertiesDecryptor

• org.devnull.client.spring.crypto.PgpPropertiesDecryptor
• org.devnull.client.spring.crypto.PbePropertiesDecryptor

The PbePropertiesDecryptor is really just a wrapper around Jasypt so you're probably better off just using it instead. The PgpPropertiesDecryptor may be of use to you.

License

Copyright 2012 Mike Cantrell

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.