Obfuscating clojure uberjars with ProGuard

Question

I was wondering if anybody has any experience with obfuscating their leiningen compiled uberjars with proguard. I\'ve tried my best to look for a solution on Google but couldn\'

Answer 1

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Obfuscating uberjars

1. Preparing your project.clj file

Here's a copy of mine (simple, default lein project, with comments):

(defproject proguard "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.4.0"]]
  :main proguard.core
  ;;; Make sure everything is aot compiled
  :aot :all
  ;;; Remove source .clj files from the resulting jar
  :omit-source true
  )

There isn't much more to it here... Also make sure that (:gen-class) is included in your namespace declarations.

Build the uberjar with lein uberjar and we are off to the next step.

2. Preparing your ProGuard config file

Once again a copy of my file follows with annotations

# Our uberjar
-injars clojure/proguard/target/proguard-0.1.0-SNAPSHOT-standalone.jar
# Our output direcotry
-outjars clojure/obfuscated

# Link to rt.jar. I'm on a Mac so your path may differ
-libraryjars /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/lib/rt.jar

# ProGuard options. Detailed explanation here http://proguard.sourceforge.net/index.html#manual/usage.html
-dontskipnonpubliclibraryclassmembers
-dontnote
-printseeds

# What we will be doing is obfuscating, shrinking and optimizing the jar. 
# If you experience any problems start out with obfuscation and add the 
# -dontoptimize  and the -dontshrink flags and see if it works.

# Tell proguard to leave the clojure runtime alone
# You would need to add any other classes that you wish to preserve here.
-keep class clojure.** { *; }

# Keep our core__init class
-keep class proguard.core__init {
    public static void load();
}

# Keep classes that contain a main method (otherwise we won't be able to run the jar)
-keepclasseswithmembers public class * {
    public static void main(java.lang.String[]);
}

Thats it. Now run proguard with your new configuration file java -jar proguard.jar @myconfig.pro. You should see a bunch of output due to the -printseeds flag (which you of course can remove if you don't want to see which classes will be kept by proguard).