Blur is a Java library for masking and obfuscating sensitive data in any data structure. It is designed to be flexible and easy to use, and supports the following types of data blurring:

• String
• Name
• Password
• Email Address
• Phone Number
• ID Card Number
• Bank Card Number
• Cascading Blurring
• Custom Annotation-Based Blurring

Usage

JDK Version

Blur is built on JDK 21. For projects using JDK 1.8 or later, please refer to this user guide.

Maven Dependency

<dependency>
    <groupId>io.allurx</groupId>
    <artifactId>blur</artifactId>
    <version>${latest version}</version>
</dependency>

Example

Object Field Blurring

Below is an example of a Person class containing some sensitive data fields and nested sensitive data fields.

public class Person {

    @Name
    public String name = "allurx";

    @PhoneNumber
    public String phoneNumber = "19962000001";

    @Password
    public String password = "123456789";

    @Cascade
    public Father father;    

}

Simply annotate the sensitive data fields with the appropriate annotations like @Name, @PhoneNumber, @Password, etc. If the field contains an object that requires cascading blurring, mark it with the @Cascade annotation. Finally, to obfuscate all the sensitive information within the object and return a new instance, use the following:

var person = Blur.blur(new Person());

Value Blurring

Blurring sensitive data in String, Collection, Array, or Map types is just as simple and easy.

void blur() {

    // String
    var v1 = Blur.blur("123456@qq.com", new AnnotatedTypeToken<@Email String>() {
    });
    assertEquals("1*****@qq.com", v1);

    // Collection
    var v2 = Blur.blur(Stream.of("123456@qq.com").collect(Collectors.toList()), new AnnotatedTypeToken<List<@Email String>>() {
    });
    v2.forEach(s -> assertEquals("1*****@qq.com", s));

    // Array
    var v3 = Blur.blur(new String[]{"123456@qq.com"}, new AnnotatedTypeToken<@Email String[]>() {
    });
    Arrays.stream(v3).forEach(s -> assertEquals("1*****@qq.com", s));

    // Map
    var v4 = Blur.blur(Stream.of("allurx").collect(Collectors.toMap(s -> s, s -> "123456@qq.com")), new AnnotatedTypeToken<Map<@Name String, @Email String>>() {
    });
    v4.forEach((s1, s2) -> {
        assertEquals("a*****", s1);
        assertEquals("1*****@qq.com", s2);
    });
}

In this example, constructing the AnnotatedTypeToken for the blurred objects is necessary to accurately capture the actual type of the object being blurred along with the appropriate annotations.

How It Works

Blur uses annotation-parser to parse custom blurring annotations across any data structure. For more details, you can refer to the project documentation.

Extension

If your application is built on Spring Boot and you prefer not to manually call blurring methods in your code, the blur-spring-boot library can be very helpful. You can find more information in the project documentation.

License

Apache License 2.0