How Guava solves log desensitization requirements!

Table of Contents

introduction

What is Guava?

How does Guava handle log desensitization requirements?

1. String replacement

2. String interception

3. Regular expression replacement

Summarize

Introduction

In modern software development, logging is a very important component. It not only helps developers quickly locate and solve problems, but also provides valuable data for analysis and monitoring. However, since logs may contain sensitive information, such as user identities, passwords, etc., in order to protect user privacy and data security, we need to desensitize the logs. This article will introduce how to use the Guava library to meet the log desensitization requirements.

What is Guava?

Guava is a Java library developed by Google that provides a rich set of tool classes and functions to simplify the Java development process. It contains many useful functions, including string processing, collection operations, cache management, etc. In terms of log processing, Guava provides some useful classes and methods to facilitate log desensitization operations.

Guava is an open source Java library developed by Google to provide efficient, reliable and concise Java programming solutions. It contains many practical tool classes and functions, covering multiple fields, such as set operations, string processing, concurrent programming, cache management, functional programming, etc. Guava’s design philosophy is to help developers improve code readability, maintainability, and testability by providing a concise and powerful API. Below are some of the main modules and functions of the Guava library:

1. Collection operations: Guava’s collection operation module is one of its most commonly used and popular parts. It provides many utility classes and interfaces that extend the Java collection framework, such as ??Lists??, ??Sets??, ??Maps? ? Wait. These tool classes and interfaces provide a wealth of functions, such as filtering, conversion, merging, splitting, etc., simplifying code writing for collection operations.
2. String processing: Guava’s string processing module provides some convenient tool classes and functions for string processing and operations. For example, the ??Strings?? class provides many static methods, such as string splicing, filling, interception, replacement, etc. The ??Charsets?? class provides some commonly used character set constants, such as UTF-8, ISO-8859-1, etc.
3. Concurrent programming: Guava’s concurrent programming module provides some tool classes and interfaces to simplify concurrent programming. For example, the ??ListenableFuture?? interface extends the ??Future?? interface in the Java standard library, providing a more powerful and flexible asynchronous programming model. The ??Futures?? class provides some static methods for processing and converting ??ListenableFuture?? objects.
4. Cache Management: Guava’s cache management module provides a simple and powerful local cache implementation. By using the ??CacheBuilder?? class, developers can easily create and configure local caches, set cache size, expiration policy, recycling policy, etc. The cache management module also provides some useful functions, such as statistics collection, asynchronous refresh, etc.
5. Functional programming: Guava’s functional programming module provides some support for functional programming. For example, the ??Function?? interface and the ??Predicate?? interface represent functions and assertions respectively, and can be used for function conversion and filtering. The ??Optional?? class provides an elegant way to handle potentially null values, avoiding null pointer exceptions. In addition to the modules and functions mentioned above, Guava also contains many other modules and tool classes, such as date and time processing, mathematical operations, IO operations, network programming, etc. In short, Guava is a feature-rich and easy-to-use Java library that provides many practical tools and functions to help developers write Java code more efficiently. Whether in daily development or when solving specific problems, Guava is a recommended choice.

How does Guava handle log masking requirements?

1. String replacement

Guava provides the ??Strings?? class, which contains some static methods for string operations. We can use the ??repeat()?? method in the ??Strings?? class to repeatedly generate a specified number of placeholders, and then use ?? The replace()?? method replaces sensitive information with placeholders. For example:

javaCopy codeString log = "User login: username=admin, password=123456";
String password = "123456";
String placeholder = Strings.repeat("*", password.length());
String sanitizedLog = log.replace(password, placeholder);
System.out.println(sanitizedLog);

The output is:

plaintextCopy codeUser login: username=admin, password=******

2. String interception

If sensitive information only occupies a part of the string, we can use ??commonPrefix()?? and ??commonSuffix( )?? method to get the prefix and suffix of sensitive information, and then replace the middle part with a placeholder. For example:

javaCopy codeString log = "User login: username=admin, password=123456";
String password = "123456";
String prefix = Strings.commonPrefix(log, password);
String suffix = Strings.commonSuffix(log, password);
String placeholder = Strings.repeat("*", password.length());
String sanitizedLog = prefix + placeholder + suffix;
System.out.println(sanitizedLog);

The output is:

plaintextCopy codeUser login: username=admin, password=******

3. Regular expression replacement

For complex sensitive information, we can use regular expressions to match and replace. Guava provides the ??CharMatcher?? class, which can easily perform character matching operations. We can use ??CharMatcher??’s ??anyOf()?? method to match the specified character set, and then use ??replaceFrom()?? method replaces the matched characters with placeholders. For example:

javaCopy codeString log = "User login: username=admin, password=123456";
String password = "123456";
String placeholder = Strings.repeat("*", password.length());
String sanitizedLog = CharMatcher.anyOf(password).replaceFrom(log, placeholder);
System.out.println(sanitizedLog);

plaintextCopy codeUser login: username=admin, password=******

javaCopy codeimport com.google.common.collect.Lists;
import com.google.common.collect.Iterables;
public class CollectionExample {
    public static void main(String[] args) {
        //Filter operation
        List<Integer> numbers = Lists.newArrayList(1, 2, 3, 4, 5);
        List<Integer> evenNumbers = Lists.newArrayList(Iterables.filter(numbers, n -> n % 2 == 0));
        System.out.println(evenNumbers); // Output: [2, 4]
        //Conversion operation
        List<String> names = Lists.newArrayList("Alice", "Bob", "Charlie");
        List<Integer> nameLengths = Lists.newArrayList(Iterables.transform(names, String::length));
        System.out.println(nameLengths); // Output: [5, 3, 7]
        // merge operation
        List<Integer> list1 = Lists.newArrayList(1, 2, 3);
        List<Integer> list2 = Lists.newArrayList(4, 5, 6);
        List<Integer> mergedList = Lists.newArrayList(Iterables.concat(list1, list2));
        System.out.println(mergedList); // Output: [1, 2, 3, 4, 5, 6]
    }
}

javaCopy codeimport com.google.common.base.Joiner;
import com.google.common.base.Splitter;
public class StringExample {
    public static void main(String[] args) {
        //String concatenation
        String joinedString = Joiner.on(", ").join("Alice", "Bob", "Charlie");
        System.out.println(joinedString); // Output: Alice, Bob, Charlie
        //String splitting
        String names = "Alice, Bob, Charlie";
        List<String> nameList = Splitter.on(", ").splitToList(names);
        System.out.println(nameList); // Output: [Alice, Bob, Charlie]
        //String interception
        String originalString = "Hello, Guava!";
        String substring = com.google.common.base.Strings.commonPrefix(originalString, "Hello, World!");
        System.out.println(substring); // Output: Hello,
    }
}

javaCopy codeimport com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
public class CacheExample {
    public static void main(String[] args) {
        //Create a cache instance
        Cache<String, Integer> cache = CacheBuilder.newBuilder()
                .maximumSize(100)
                .build();
        //Put data into cache
        cache.put("one", 1);
        cache.put("two", 2);
        cache.put("three", 3);
        // Get data from cache
        Integer value = cache.getIfPresent("two");
        System.out.println(value); // Output: 2
        // Data that does not exist in the cache will return null.
        Integer nonExistingValue = cache.getIfPresent("four");
        System.out.println(nonExistingValue); // Output: null
    }
}