public/subjects/java/checkpoints/config-protector/README.md

Config Protector

Instructions

Create a class ConfigProtector that provides a method to hide sensitive data in a configuration file using Regex. The method should replace sensitive values with asterisks. The configuration file will be provided as a String, and the keys for the sensitive data will be given in a List.

The config file format will always be as follows:

username=admin
npassword=secret
...

Expected Class

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ConfigProtector {
    public String hideSensitiveData(String configFile, List<String> sensitiveKeys) {
        // Implementation to hide sensitive data in the configuration file using regex
    }
}

Usage

Here is a possible ExerciseRunner.java to test your class:

import java.util.List;
import java.util.Arrays;

public class ExerciseRunner {
    public static void main(String[] args) {
        ConfigProtector protector = new ConfigProtector();

        String configFile1 = "username=admin\npassword=secret\nhost=localhost\n";
        List<String> sensitiveKeys1 = Arrays.asList("password");
        System.out.println("Protected Config 1:\n" + protector.hideSensitiveData(configFile1, sensitiveKeys1));

        String configFile2 = "apiKey=12345\napiSecret=abcdef\nendpoint=https://api.example.com\n";
        List<String> sensitiveKeys2 = Arrays.asList("apiKey", "apiSecret");
        System.out.println("Protected Config 2:\n" + protector.hideSensitiveData(configFile2, sensitiveKeys2));

        String configFile3 = "username=user\npassword=pass\n";
        List<String> sensitiveKeys3 = Arrays.asList("username", "password");
        System.out.println("Protected Config 3:\n" + protector.hideSensitiveData(configFile3, sensitiveKeys3));
    }
}

Expected Output

$ javac *.java -d build
$ java -cp build ExerciseRunner
Protected Config 1:
username=admin
password=******
host=localhost

Protected Config 2:
apiKey=*****
apiSecret=******
endpoint=https://api.example.com

Protected Config 3:
username=****
password=****
$