FIX: S3 uploads were missing a cache-control header (#7902)

Admins still need to run the rake task to fix the files who where uploaded previously.

lib/file_store/s3_store.rb

@@ -43,6 +43,7 @@ module FileStore
       cache_file(file, File.basename(path)) if opts[:cache_locally]
       options = {
         acl: opts[:private] ? "private" : "public-read",
+        cache_control: 'max-age=31556952, public, immutable',
         content_type: opts[:content_type].presence || MiniMime.lookup_by_filename(filename)&.content_type
       }
       # add a "content disposition" header for "attachments"

lib/tasks/s3.rake

@@ -140,6 +140,50 @@ task 's3:correct_acl' => :environment do
 
 end
 
+task 's3:correct_cachecontrol' => :environment do
+  ensure_s3_configured!
+
+  puts "ensuring cache-control is set on every upload and optimized image"
+
+  i = 0
+
+  base_url = Discourse.store.absolute_base_url
+
+  acl = SiteSetting.prevent_anons_from_downloading_files ? 'private' : 'public-read'
+  cache_control = 'max-age=31556952, public, immutable'
+
+  objects = Upload.pluck(:id, :url).map { |array| array << :upload }
+  objects.concat(OptimizedImage.pluck(:id, :url).map { |array| array << :optimized_image })
+
+  puts "#{objects.length} objects found"
+
+  objects.each do |id, url, type|
+    i += 1
+    if !url.start_with?(base_url)
+      puts "Skipping #{type} #{id} since it is not stored on s3, url is #{url}"
+    else
+      begin
+        key = url[(base_url.length + 1)..-1]
+        object = Discourse.store.s3_helper.object(key)
+        object.copy_from(
+          copy_source: "#{object.bucket_name}/#{object.key}",
+          acl: acl,
+          cache_control: cache_control,
+          content_type: object.content_type,
+          content_disposition: object.content_disposition,
+          metadata_directive: 'REPLACE'
+        )
+      rescue => e
+        puts "Skipping #{type} #{id} url is #{url} #{e}"
+      end
+    end
+    if i % 100 == 0
+      puts "#{i} done"
+    end
+  end
+
+end
+
 task 's3:upload_assets' => :environment do
   ensure_s3_configured!