[JAVA Reverse Engineering]]: Quickly decompile a .jar AND its relevant classes

decompile-full-jar.sh

#!/bin/bash

# author: @nil0x42
# Quickly decompile a .jar AND its interesting classes for reversing

PROCYON="procyon-decompiler"
JAR="jar"
OUT="$1.decompile"

if [[ $# -ne 1 ]] || [[ "$1" != *".jar" ]]; then
    echo "Usage: $0 FILE.jar" >&2
    exit 1
fi
if ! [ -x "$(command -v $PROCYON)" ]; then
    PROCYON="procyon"
    if ! [ -x "$(command -v $PROCYON)" ]; then
        echo "Error: $PROCYON is not installed." >&2
        exit 1
    fi
fi
if ! [ -x "$(command -v $JAR)" ]; then
    echo "Error: $JAR is not installed." >&2
    exit 1
fi
if [ ! -f "$1" ]; then
    echo "Error: $1: file does not exist." >&2
    exit 1
fi
if [ -e "$OUT" ]; then
    echo "Error: Output directory $OUT already exists." >&2
    exit 1
fi

mkdir "$OUT"
cp "$1" "$OUT"
pushd "$OUT"

archive="`echo *.jar`"

$JAR -xf "$archive"
rm "$archive"

find . -type f -name '*.class' \
    -not -path "./org/*" \
    -not -path "./com/*" \
    -not -path "./net/*" \
    -not -path "./de/*" \
    | xargs "$PROCYON" -o .

# uncomment if you wish to remove .class files from decompiled JAR
#find . -type f -name '*.class' -exec /bin/rm '{}' ';'

popd
echo ""
echo "[+] $1 correctly decompressed into $OUT"