From 2aa3b955f9b4f69ed7e791a77cec0229527a5b97 Mon Sep 17 00:00:00 2001
From: Marcel <marcel@familienarchiv>
Date: Wed, 22 Apr 2026 21:37:05 +0200
Subject: [PATCH] build: add twelvemonkeys-imageio-tiff for thumbnail TIFF
 support

JDK ImageIO handles JPEG, PNG, BMP, GIF out of the box but not TIFF.
Since the document upload allowlist permits image/tiff, the thumbnail
generator must also decode it.

Refs #307

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
---
 backend/pom.xml | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/backend/pom.xml b/backend/pom.xml
index 33c1483e..5a733e76 100644
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -164,12 +164,19 @@
 			<version>3.0.2</version>
 		</dependency>
 
-		<!-- PDF rendering for training data export -->
+		<!-- PDF rendering for training data export and thumbnail generation -->
 		<dependency>
 			<groupId>org.apache.pdfbox</groupId>
 			<artifactId>pdfbox</artifactId>
 			<version>3.0.4</version>
 		</dependency>
+
+		<!-- TIFF decoding plugin for ImageIO (thumbnail generation from scanned TIFFs) -->
+		<dependency>
+			<groupId>com.twelvemonkeys.imageio</groupId>
+			<artifactId>imageio-tiff</artifactId>
+			<version>3.12.0</version>
+		</dependency>
 	</dependencies>