Bdtjtk

I want to remove commented properties from properties file through ant build. For security purpose, I don't want to expose my production properties on sandbox servers.

Properties file:

#production properties

#redis.master.url=redis.prod.master.compny.com

#redis.slave.url=redis.prod.slave.compny.com



#sandboxproperties

redis.master.url=redis.sandbox.master.compny.com

redis.slave.url=redis.sandbox.slave.compny.com

so, my war package should have following properties file:

redis.master.url=redis.sandbox.master.compny.com

redis.slave.url=redis.sandbox.slave.compny.com

As per Ant docs:

Apache Ant provides an optional task for editing property files. This is very useful when wanting to make unattended modifications to configuration files for application servers and applications. Currently, the task maintains a working property file with the ability to add properties or make changes to existing ones. Since Ant 1.8.0 comments and layout of the original properties file are preserved.

So depending on which version of ant build you are using you may be able to remove comments from properties file.

You could do it using a script in ant:

<macrodef name="remove-properties-comments">

    <attribute name="inFile" />

    <attribute name="outFile" />

    <sequential>

        <script language="javascript">

            <![CDATA[

                // get the arguments

                var inFile = "@{inFile}"

                var outFile = "@{outFile}"



                // or get properties from the ant environment

                // eg: <property name="property.from.ant.project" value="value" />

                // var antProp = project.getProperty("property.from.ant.project");



                // load Java types

                var File = Java.type("java.io.File")

                var PrintWriter = Java.type("java.io.PrintWriter")

                var Scanner = Java.type("java.util.Scanner")



                // init reader and writer

                var reader = new Scanner(new File(inFile))

                var writer = new PrintWriter(outFile)



                // if previous line ended in '' then it is a muliline property

                // so the following line should always be included

                var multiline = false

                while (reader.hasNextLine()) {

                    var line = reader.nextLine();

                    // you could exclude blank lines too if you want

                    if (multiline || !(line.startsWith("#") || line.startsWith("!"))) {

                        writer.println(line);

                    }

                    multiline = line.endsWith("\");

                }

               ]]>

        </script>

    </sequential>

</macrodef>



<target name="test">

    <remove-properties-comments inFile="path/to/inFile.properties" outFile="path/to/outFile.properties" />

</target>

I figured this out simply by using replaceregexp.

<target>

    <replaceregexp match="n#(.*)" replace="" flags="g" byline="false">

        <fileset dir="${build.home}/WEB-INF/classes" includes="**/*.properties" />

    </replaceregexp>

</target>

Here n#(.*) matches the <newline>(n) followed by # followed by any set of characters(*).