fix(wopi): increase guest UserId hash length to 16 chars

Arildm-no · claude · Arildm-no · commit e93e9c80c61f · 2026-05-06T10:21:15.000+02:00
Addresses review feedback: bumps substr length from 8 to 16 hex chars
(64-bit) for Birthday Paradox mitigation on guest UserId generation.

Co-Authored-By: Claude Sonnet 4.6 &lt;noreply@anthropic.com&gt;
diff --git a/lib/Controller/WopiController.php b/lib/Controller/WopiController.php
@@ -485,7 +485,7 @@ public function getSettings(
 			}
 
 			$isPublic = empty($wopi->getEditorUid());
-			$guestUserId = 'Guest-' . substr(hash('sha256', $wopi->getToken()), 0, 8);
+			$guestUserId = 'Guest-' . substr(hash('sha256', $wopi->getToken()), 0, 16);
 			$userId = !$isPublic ? $wopi->getEditorUid() : $guestUserId;
 
 			$userConfig = $this->settingsService->generateSettingsConfig($type, $userId);

Original file line number	Diff line number	Diff line change
`@@ -485,7 +485,7 @@ public function getSettings(`
`485`	`485`	`}`
`486`	`486`
`487`	`487`	`$isPublic = empty($wopi->getEditorUid());`
`488`		`- $guestUserId = 'Guest-' . substr(hash('sha256', $wopi->getToken()), 0, 8);`
	`488`	`+ $guestUserId = 'Guest-' . substr(hash('sha256', $wopi->getToken()), 0, 16);`
`489`	`489`	`$userId = !$isPublic ? $wopi->getEditorUid() : $guestUserId;`
`490`	`490`
`491`	`491`	`$userConfig = $this->settingsService->generateSettingsConfig($type, $userId);`