From 5b951f012e04e6ef97e4ef645d53bdf433a9eb7f Mon Sep 17 00:00:00 2001
From: erdgeist <erdgeist@erdgeist.org>
Date: Tue, 21 Jul 2026 21:02:16 +0200
Subject: Implement model side of PDF raster preview generation

---
 app/models/concerns/file_attachment.rb | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'app')

diff --git a/app/models/concerns/file_attachment.rb b/app/models/concerns/file_attachment.rb
index 548531f..6221312 100644
--- a/app/models/concerns/file_attachment.rb
+++ b/app/models/concerns/file_attachment.rb
@@ -31,6 +31,7 @@ module FileAttachment
 
   IMAGE_CONTENT_TYPES    = %w[image/jpeg image/gif image/png image/webp].freeze
   VECTOR_CONTENT_TYPES   = %w[image/svg+xml].freeze
+  RASTERIZED_CONTENT_TYPES = %w[application/pdf].freeze
   DISPLAYABLE_AS_IMAGE   = IMAGE_CONTENT_TYPES + VECTOR_CONTENT_TYPES
 
   included do
@@ -60,6 +61,11 @@ module FileAttachment
     has_variant?(:medium)
   end
 
+  def variant_filename(style)
+    return upload_file_name if style == :original || !RASTERIZED_CONTENT_TYPES.include?(upload_content_type)
+    File.basename(upload_file_name, ".*") + ".png"
+  end
+
   private
 
   def build_upload_proxy
@@ -89,11 +95,7 @@ module FileAttachment
     FileUtils.mkdir_p(File.dirname(original_path))
     FileUtils.cp(uploaded_file.tempfile.path, original_path)
 
-    if IMAGE_CONTENT_TYPES.include?(upload_content_type)
-      generate_variants(original_path)
-    elsif VECTOR_CONTENT_TYPES.include?(upload_content_type)
-      generate_svg_variants(original_path)
-    end
+    generate_all_variants(original_path)
   end
 
   def generate_variants(original_path)
@@ -112,6 +114,16 @@ module FileAttachment
     end
   end
 
+  def generate_all_variants(original_path)
+    if IMAGE_CONTENT_TYPES.include?(upload_content_type)
+      generate_variants(original_path)
+    elsif VECTOR_CONTENT_TYPES.include?(upload_content_type)
+      generate_svg_variants(original_path)
+    elsif RASTERIZED_CONTENT_TYPES.include?(upload_content_type)
+      generate_variants("#{original_path}[0]")
+    end
+  end
+
   def delete_upload_files
     dir = upload_root.join(id.to_s)
     FileUtils.rm_rf(dir) if Dir.exist?(dir)
@@ -135,7 +147,7 @@ module FileAttachment
 
     def url(style = :original)
       return "" if @record.upload_file_name.blank?
-      "/system/uploads/#{@record.id}/#{style}/#{@record.upload_file_name}"
+      "/system/uploads/#{@record.id}/#{style}/#{@record.variant_filename(style)}"
     end
 
     def content_type
-- 
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