feat: add Steam ID redaction pass

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Util/ProjectZomboid/ProjectZomboidRedactor.php

@@ -24,6 +24,12 @@ use IndifferentKetchup\Codex\Util\RedactorInterface;
  */
 class ProjectZomboidRedactor implements RedactorInterface
 {
+    /** Regex matching a 17-digit SteamID64 anchored on the 76561198 universe prefix, with lookaround boundaries that reject embedded occurrences. */
+    public const string STEAM_ID_REGEX = '/(?<![A-Za-z0-9])76561198\d{9}(?![A-Za-z0-9])/u';
+
+    /** Zeroed-out SteamID64 placeholder; syntactically valid but refers to no real account. */
+    public const string STEAM_ID_REPLACEMENT = '76561198000000000';
+
     private bool $redactSteamIds = true;
     private bool $redactPlayerNames = true;
     private bool $redactCoordinates = true;
@@ -76,7 +82,7 @@ class ProjectZomboidRedactor implements RedactorInterface
     public function redact(string $content): string
     {
         if ($this->redactSteamIds) {
-            // Steam ID pass added in Task 2
+            $content = preg_replace(self::STEAM_ID_REGEX, self::STEAM_ID_REPLACEMENT, $content);
         }
         if ($this->redactPlayerNames) {
             // Player name pass added in Task 3

test/tests/Util/Redactor/ProjectZomboidRedactorSteamIdTest.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Test\Tests\Util\Redactor;
+
+use IndifferentKetchup\Codex\Util\ProjectZomboid\ProjectZomboidRedactor;
+use PHPUnit\Framework\TestCase;
+
+class ProjectZomboidRedactorSteamIdTest extends TestCase
+{
+    public function testCollapsesDistinctSteamIdsToZeroPlaceholder(): void
+    {
+        $input = 'Players: 76561198111111111, 76561198222222222, 76561198333333333 connected.';
+        $expected = 'Players: 76561198000000000, 76561198000000000, 76561198000000000 connected.';
+
+        $output = (new ProjectZomboidRedactor())->redact($input);
+
+        $this->assertSame($expected, $output, 'All three distinct Steam IDs should be replaced with the zero placeholder.');
+    }
+
+    public function testNonSteamIdLongDigitsAreNotTouched(): void
+    {
+        // 13-digit Unix-millisecond timestamp (PZ log t: shape) and a 17-digit number
+        // that does not begin with 76561198 — neither should be altered.
+        $input = 't:1776297642406 score=12345678901234567';
+
+        $output = (new ProjectZomboidRedactor())->redact($input);
+
+        $this->assertSame($input, $output, 'Non-SteamID digit sequences must not be modified.');
+    }
+
+    public function testEmbeddedSteamIdInsideLongerAlphanumericTokenIsNotTouched(): void
+    {
+        // The SteamID64 pattern is embedded inside a longer alphanumeric token;
+        // the negative lookaround boundaries should prevent a match.
+        $input = 'token=abc76561198000000001def other=data';
+
+        $output = (new ProjectZomboidRedactor())->redact($input);
+
+        $this->assertSame($input, $output, 'A Steam ID embedded inside an alphanumeric token must not be redacted.');
+    }
+
+    public function testToggleOffLeavesSteamIdsIntact(): void
+    {
+        $input = 'Connected: 76561198111111111 and 76561198222222222.';
+
+        $output = (new ProjectZomboidRedactor())
+            ->redactSteamIds(false)
+            ->redact($input);
+
+        $this->assertSame($input, $output, 'With the Steam ID toggle disabled the original input must be returned unchanged.');
+    }
+}