From fa151ad11688a3bfc663af9eec0e1ade1d58fd45 Mon Sep 17 00:00:00 2001
From: Daniel Seifert <git@daniel-seifert.com>
Date: Tue, 7 Jan 2025 10:17:32 +0100
Subject: [PATCH] add optional fixed replacement length

---
 CHANGELOG.md                            |  5 ++++-
 src/sensitiveMessageFormatter.php       | 13 ++++++++++---
 tests/sensitiveMessageFormatterTest.php |  8 +++++++-
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f8b793..ada3d85 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,8 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [Unreleased](https://git.d3data.de/D3Public/sensitiveMessageFormatter/compare/1.0.1...rel_1.x)
+## [Unreleased](https://git.d3data.de/D3Public/sensitiveMessageFormatter/compare/1.1.0...rel_1.x)
 
+## [1.1.0](https://git.d3data.de/D3Public/sensitiveMessageFormatter/compare/1.0.1...1.1.0) - 2025-01-07
+### Added
+- optional fixed length replacement
 
 ## [1.0.1](https://git.d3data.de/D3Public/sensitiveMessageFormatter/compare/1.0.0...1.0.1) - 2025-01-01
 ### Changed
diff --git a/src/sensitiveMessageFormatter.php b/src/sensitiveMessageFormatter.php
index e779309..c46660c 100644
--- a/src/sensitiveMessageFormatter.php
+++ b/src/sensitiveMessageFormatter.php
@@ -32,7 +32,8 @@ class sensitiveMessageFormatter extends MessageFormatter
     public function __construct(
         ?string $template = self::CLF,
         protected array $anonymizations = [],
-        protected ?string $replaceChar = null
+        protected ?string $replaceChar = null,
+        protected ?int $fixedReplacementLength = null
     ) {
         $this->createReplacements($this->anonymizations);
 
@@ -51,8 +52,14 @@ class sensitiveMessageFormatter extends MessageFormatter
 
         array_map(
             function ($search) use (&$replacements) {
-                $replacements[$search] = str_repeat($this->replaceChar ?? '*', strlen($search));
-                $replacements[urlencode($search)] = str_repeat($this->replaceChar ?? '*', strlen($search));
+                $replacements[$search] = str_repeat(
+                    $this->replaceChar ?? '*', 
+                    $this->fixedReplacementLength ?? strlen($search)
+                );
+                $replacements[urlencode($search)] = str_repeat(
+                    $this->replaceChar ?? '*', 
+                    $this->fixedReplacementLength ?? strlen($search)
+                );
             },
             $search
         );
diff --git a/tests/sensitiveMessageFormatterTest.php b/tests/sensitiveMessageFormatterTest.php
index d5ad5f6..c2fa6e6 100644
--- a/tests/sensitiveMessageFormatterTest.php
+++ b/tests/sensitiveMessageFormatterTest.php
@@ -69,7 +69,12 @@ class sensitiveMessageFormatterTest extends ApiTestCase
      * @dataProvider createReplacementsDataProvider
      * @covers       \D3\SensitiveMessageFormatter\sensitiveMessageFormatter::createReplacements
      */
-    public function testCreateReplacements(array $input, array $expected, ?string $replacement = null): void
+    public function testCreateReplacements(
+        array $input,
+        array $expected,
+        ?string $replacement = null,
+        ?int $fixedReplacementLenth = null
+    ): void
     {
         if ($replacement) {
             $this->setValue(
@@ -100,6 +105,7 @@ class sensitiveMessageFormatterTest extends ApiTestCase
         yield 'multiple' => [['def', 'def'], ['def' => '***']];
         yield 'urlencoded' => [['1&c'], ['1&c' => '***', '1%26c' => '***' ]];
         yield 'different replace char' => [['abcd'], ['abcd' => '####'], '#'];
+        yield 'fixed replacement lenght' => [['abcd'], ['abcd' => '*******'], '*', 7];
     }
 
     /**