我创建了一个简单的脚本,读取 Ruby 文件,生成缩小和混淆的版本,然后解释输出以再次重新生成它 https://github.com/ltfschoen/RubyTest/tree/master/minify_and_obfuscate_ruby。我创建了一个 Ruby 文件并使用命令扩展来运行可以使用以下命令执行的 Shell 脚本ruby main.rb
:
main.rb
class MinifyAndObfuscateRuby
def initialize(shell_script="./main.sh")
@shell_script = shell_script
run_shell_script
end
private
def run_shell_script
%x[sh #{@shell_script}]
end
end
我编写了 Shell 脚本,它接受输入 Ruby 源文件并根据输入生成输出文件。或者您可以直接使用 with 运行它sh main.sh
(而不是使用main.rb
我添加用于使用 RSpec 进行测试的包装器)。请注意,存储库中共享的大部分 main.sh 代码如下所示,但为了简洁起见,我省略了详细信息recover_source
函数,它尝试在第二个输出文件中重新生成原始 Ruby 源文件。
main.sh
#!/bin/bash
# Purpose: Simple script that reads a Ruby file, generates a minified and
# obfuscated version, and then interprets the output to regenerate it again.
# Execute either by running `main.rb` Ruby file (uses command expansion to run this Shell script)
# with `ruby main.rb` or with directly with `sh main.sh`. Outputs are automatically
# generated in an ./outputs subdirectory.
# declare and instantiate variables
MINLEN=0 # optionally exclude iteration of blank lines when MINLENGTH is 1
input_file="./source.rb"
reverse=""
output_file="./outputs/output_minified_and_obfuscated.min.rb"
output_file_recovered="./outputs/output_unminified_and_unobfuscated.rb"
# obfuscate: by reversing each line
function obfuscate {
for (( i=$len-1; i>=0; i-- )); do
reverse="$reverse${line:$i:1}"
done
reverse+="\n"
}
# minify: find instances of the tuple keys in the variable containing the
# reversed input file string and replace with respective tuple values
function minify {
find_data='eriuqer;*r* fed;*d* dne;*e* edulcni;*i* ssalc;*c* redaer_rtta;*ar*';
for tuple in $find_data; do
key=$(echo $tuple | cut -d ';' -f 1);
value=$(echo $tuple | cut -d ';' -f 2);
reverse=${reverse/$key/$value}
done
}
function process_source {
# read lines from input file
while IFS= read -r line || [ -n "$line" ]; do
len=${#line}
if [ "$len" -ge "$MINLEN" ]; then
obfuscate
minify
fi
done < "$input_file"
echo "$output_file not found. Creating $output_file and adding minified and obfuscated contents"
! [[ -d "outputs" ]] && mkdir outputs
touch $output_file
echo $reverse >> $output_file
}
# check if output Ruby file already exists and if so regenerate source, otherwise create it
if [ -f "$output_file" ] && ! [ -f "$output_file_recovered" ]; then
echo "$output_file already exists."
recover_source # see source code for details of this method
exit 0
elif [ -f "$input_file" ] && ! [ -f "$output_file_recovered" ]; then
process_source
exit 0
else
echo "$output_file and $output_file_recovered have both already been generated."
echo "Deleted temporary files and restarting process..."
[ -f "$output_file" ] && rm -f "$output_file"
[ -f "$output_file_recovered" ] && rm -f "$output_file_recovered"
[ -d "outputs" ] && rmdir outputs
exit 0
fi
我使用的示例源代码文件如下所示:
源文件.rb
require 'bigdecimal'
class Obfiscate
include Comparable
attr_reader :name
def initialize(name)
@name = name
end
end
它通过反转源文件中的每一行来应用一定程度的混淆,并使用正则表达式用我自己的自定义缩写替换 Ruby 语法(即替换require
with *r*
, class
with *c*
, attr_accessor
with *ar*
, def
with *d*
, and end
with *e*
) 以减少总字符数并可选择删除空白行,如下面的示例输出所示:
./outputs/output_minified_and_obfuscated.min.rb
'lamicedgib' *r*
etacsifbO *c*
elbarapmoC
eman: *ar*
)eman(ezilaitini *d*
eman = eman@
*e*
*e*