import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class LogSanitizer {

private static final Pattern USERNAME_PATTERN = Pattern.compile("[^a-zA-Z0-9_\\-]+"); // Remove invalid characters from usernames

private static final Pattern IP_ADDRESS_PATTERN = Pattern.compile("[^0-9\\.]"); // Remove invalid characters from IP addresses

private static final Pattern EMAIL_PATTERN = Pattern.compile("[^a-zA-Z0-9._%+-]"); //Remove invalid characters from email addresses

private static final Pattern SHELL_COMMAND_PATTERN = Pattern.compile("(?i)sudo\\s+.*"); // Remove sudo commands

private static final Pattern PASSWORD_PATTERN = Pattern.compile("(?i)password|pass|pwd"); // Remove password hints

public static void sanitizeLogFile(String logFilePath, String sanitizedLogFilePath) {

try (BufferedReader reader = new BufferedReader(new FileReader(logFilePath));

java.io.BufferedWriter writer = new BufferedWriter(new FileWriter(sanitizedLogFilePath))) {

String line;

while ((line = reader.readLine()) != null) {

line = sanitizeLine(line);

writer.write(line);

writer.newLine();

}

System.out.println("Sanitization complete. Sanitized log written to: " + sanitizedLogFilePath);

} catch (IOException e) {

System.err.println("Error processing log file: " + e.getMessage());

e.printStackTrace(); // Log the full stack trace for debugging

}

}

private static String sanitizeLine(String line) {

//Sanitize username

Matcher usernameMatcher = USERNAME_PATTERN.matcher(line);

line = usernameMatcher.replaceAll("");

//Sanitize IP address

Matcher ipMatcher = IP_ADDRESS_PATTERN.matcher(line);

line = ipMatcher.replaceAll("");

//Sanitize email

Matcher emailMatcher = EMAIL_PATTERN.matcher(line);

line = emailMatcher.replaceAll("");

//Sanitize sudo commands

Matcher sudoMatcher = SHELL_COMMAND_PATTERN.matcher(line);

line = sudoMatcher.replaceAll("");

//Sanitize password hints

Matcher passwordMatcher = PASSWORD_PATTERN.matcher(line);

line = passwordMatcher.replaceAll("");

//Verbose logging

System.out.println("Original line: " + line);

System.out.println("Sanitized line: " + line);

return line.trim(); //Remove leading/trailing whitespace

}

public static void main(String[] args) {

if (args.length != 2) {

System.out.println("Usage: java LogSanitizer <input_log_file> <output_log_file>");

return;

}

String inputLogFile = args[0];

String outputLogFile = args[1];

sanitizeLogFile(inputLogFile, outputLogFile);

}

}