IMPL: Added new Pattern Builder and Unit Test

README.md

@@ -233,14 +233,14 @@ Alternatively you can pull it from the central Maven repositories:
 <dependency>
   <groupId>com.ebay.ejmask</groupId>
   <artifactId>ejmask-bom</artifactId>
-  <version>1.0.3</version>
+  <version>1.1.0-SNAPSHOT</version>
 </dependency>
 ```
 
 ### Using in your Gradle Project.
 
 ```groovy
-compile group: 'com.ebay.ejmask', name: 'ejmask-bom', version: '1.0.3'
+compile group: 'com.ebay.ejmask', name: 'ejmask-bom', version: '1.1.0-SNAPSHOT'
 ```
 
 ## Roadmap

ejmask-api/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-parent</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-api</artifactId>

ejmask-bom/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-parent</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 

ejmask-core/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-parent</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-core</artifactId>

ejmask-extensions/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-parent</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-extensions</artifactId>

ejmask-extensions/src/main/java/com/ebay/ejmask/extenstion/builder/json/JsonValueUnmaskFromEndPatternBuilder.java

@@ -0,0 +1,47 @@
+package com.ebay.ejmask.extenstion.builder.json;
+
+import com.ebay.ejmask.extenstion.builder.AbstractRegexPatternBuilder;
+
+/**
+ * An implementation of IPatternBuilder to support high sensitive JSON field, whose value
+ * need to be partially masked with relative field from end of the field.
+ *
+ * @author parasdharwal33
+ */
+public class JsonValueUnmaskFromEndPatternBuilder extends AbstractRegexPatternBuilder {
+
+    //https://regex101.com/r/LL3EY7/1/
+    private static final String PATTERN_TEMPLATE = "\\\"(%s)(\\\\*\\\"\\s*:\\s*\\\\*\\\")[^\\\"]*([^\\\\\"]{%d})(\\\\?\\\"|)";
+    //group $1 = field name
+    //group $2 =  ":" (with json serialization support)
+    //group $3 =  sensitive information -> unmasked
+    //group $4 =  ending qts
+    private static final String REPLACEMENT_TEMPLATE = "\"$1$2xxxx-$3$4";
+
+    /**
+     * Build pattern to match
+     *
+     * @param visibleCharacters as no of characters to be visible.
+     * @param fieldNames        as list of field names
+     * @return match pattern
+     */
+    @Override
+    public String buildPattern(int visibleCharacters, String... fieldNames) {
+        if (visibleCharacters < 0) {
+            throw new IllegalArgumentException("visibleCharacters must be a value greater than zero instead of " + visibleCharacters);
+        }
+        return String.format(PATTERN_TEMPLATE, super.buildFieldNamesForRegexOr(fieldNames), visibleCharacters);
+    }
+
+    /**
+     * Build pattern to replace.
+     *
+     * @param visibleCharacters as no of characters to be visible.
+     * @param fieldNames        as list of field names
+     * @return match pattern
+     */
+    @Override
+    public String buildReplacement(int visibleCharacters, String... fieldNames) {
+        return REPLACEMENT_TEMPLATE;
+    }
+}

ejmask-extensions/src/test/java/com/ebay/ejmask/extenstion/builder/json/JsonValueUnmaskFromEndPatternBuilderTest.java

@@ -0,0 +1,105 @@
+package com.ebay.ejmask.extenstion.builder.json;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.regex.Pattern;
+import java.util.stream.Stream;
+
+public class JsonValueUnmaskFromEndPatternBuilderTest {
+
+    public static final JsonValueUnmaskFromEndPatternBuilder instance = new JsonValueUnmaskFromEndPatternBuilder();
+    public static final String[] fieldNames = new String[]{"ccNumber", "ssn"};
+
+    @Test
+    public void testBuildPattern() {
+        int visibleCharacters = 4;
+        String result = instance.buildPattern(visibleCharacters, fieldNames);
+        Assertions.assertEquals("\\\"(ccNumber|ssn)(\\\\*\\\"\\s*:\\s*\\\\*\\\")[^\\\"]*([^\\\\\"]{4})(\\\\?\\\"|)", result);
+    }
+
+    @Test
+    public void testBuildPattern_withNegativeVisibleCharacters() {
+        int visibleCharacters = -1;
+        Assertions.assertThrows(IllegalArgumentException.class, () -> instance.buildPattern(visibleCharacters, fieldNames));
+    }
+
+    @Test
+    public void testBuildReplacement() {
+        int visibleCharacters = 4;
+        String result = instance.buildReplacement(visibleCharacters, fieldNames);
+        Assertions.assertEquals("\"$1$2xxxx-$3$4", result);
+    }
+
+    @ParameterizedTest
+    @MethodSource("dataForTestMatch")
+    public void testMatch(String name, String data, String expected) {
+        String regex = instance.buildPattern(4, fieldNames);
+        String replacement = instance.buildReplacement(4, fieldNames);
+        Pattern pattern = Pattern.compile(regex);
+        String result = pattern.matcher(data).replaceAll(replacement);
+        Assertions.assertFalse(result.contains("1234567890"));
+        Assertions.assertEquals(expected, result);
+    }
+
+    static Stream<Arguments> dataForTestMatch() {
+        return Stream.of(
+                Arguments.arguments(
+                        "test with normal json",
+                        "{\"ccNumber\":\"1234567890123456\",\"ssn\":\"123456789\",\"nonSensitiveData\":\"data\"}",
+                        "{\"ccNumber\":\"xxxx-3456\",\"ssn\":\"xxxx-6789\",\"nonSensitiveData\":\"data\"}"
+                ),
+                Arguments.arguments(
+                        "test with empty values",
+                        "{\"ccNumber\":\"\",\"ssn\":null,\"nonSensitiveData\":\"data\"}",
+                        "{\"ccNumber\":\"\",\"ssn\":null,\"nonSensitiveData\":\"data\"}"
+                ),
+                Arguments.arguments(
+                        "test with space",
+                        "{\"ccNumber\"     :   \"1234567890123456\",   \"ssn\"   :\"123456789\",\"nonSensitiveData\":\"data\"}",
+                        "{\"ccNumber\"     :   \"xxxx-3456\",   \"ssn\"   :\"xxxx-6789\",\"nonSensitiveData\":\"data\"}"
+                ),
+                Arguments.arguments(
+                        "test with line break",
+                        "{\n"
+                                + "  \"ccNumber\": \"1234567890123456\",\n"
+                                + "  \"ssn\": \"123456789\",\n"
+                                + "  \"nonSensitiveData\": \"data\"\n"
+                                + "}",
+                        "{\n"
+                                + "  \"ccNumber\": \"xxxx-3456\",\n"
+                                + "  \"ssn\": \"xxxx-6789\",\n"
+                                + "  \"nonSensitiveData\": \"data\"\n"
+                                + "}"
+                ),
+                Arguments.arguments(
+                        "test with broken json",
+                        "{\"ccNumber\":\"1234567890123456\",\"ssn\":\"123456789",
+                        "{\"ccNumber\":\"xxxx-3456\",\"ssn\":\"xxxx-6789"
+                ),
+                Arguments.arguments(
+                        "test with json encoded json",
+                        "{\\\"ccNumber\\\":\\\"1234567890123456\\\",\\\"ssn\\\":\\\"123456789\\\",\\\"nonSensitiveData\\\":\\\"data\\\"}",
+                        "{\\\"ccNumber\\\":\\\"xxxx-3456\\\",\\\"ssn\\\":\\\"xxxx-6789\\\",\\\"nonSensitiveData\\\":\\\"data\\\"}"
+                ),
+                Arguments.arguments(
+                        "test with double json encoded json",
+                        "{\\\\\\\"ccNumber\\\\\\\":\\\\\\\"1234567890123456\\\\\\\",\\\\\\\"ssn\\\\\\\":\\\\\\\"123456789\\\\\\\",\\\\\\\"nonSensitiveData\\\\\\\":\\\\\\\"data\\\\\\\"}",
+                        "{\\\\\\\"ccNumber\\\\\\\":\\\\\\\"xxxx-3456\\\\\\\",\\\\\\\"ssn\\\\\\\":\\\\\\\"xxxx-6789\\\\\\\",\\\\\\\"nonSensitiveData\\\\\\\":\\\\\\\"data\\\\\\\"}"
+                ),
+                Arguments.arguments(
+                        "test with encoded broken json",
+                        "{\\\"ccNumber\\\":\\\"1234567890123456\\\",\\\"ssn\\\":\\\"123456789",
+                        "{\\\"ccNumber\\\":\\\"xxxx-3456\\\",\\\"ssn\\\":\\\"xxxx-6789"
+                ),
+                Arguments.arguments(
+                        "test with encoded broken json 2",
+                        "{\\\"ccNumber\\\":\\\"1234567890123456\\\",\\\"ssn\\\":\\\"123456789\\",
+                        "{\\\"ccNumber\\\":\\\"xxxx-3456\\\",\\\"ssn\\\":\\\"xxxx-6789\\"
+                )
+        );
+    }
+}

ejmask-spring/ejmask-spring-autoconfig/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-spring</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-spring-autoconfig</artifactId>

ejmask-spring/ejmask-spring-boot/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-spring</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-spring-boot</artifactId>

ejmask-spring/ejmask-spring-core/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-spring</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-spring-core</artifactId>

ejmask-spring/pom.xml

@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.ebay.ejmask</groupId>
         <artifactId>ejmask-parent</artifactId>
-        <version>1.0.3</version>
+        <version>1.1.0-SNAPSHOT</version>
     </parent>
 
     <artifactId>ejmask-spring</artifactId>

pom.xml

@@ -3,7 +3,7 @@
 
     <groupId>com.ebay.ejmask</groupId>
     <artifactId>ejmask-parent</artifactId>
-    <version>1.0.3</version>
+    <version>1.1.0-SNAPSHOT</version>
 
     <packaging>pom</packaging>