FIX: Don't try to recover an invalid sha1.

lib/upload_recovery.rb

@@ -51,7 +51,7 @@ class UploadRecovery
   private
 
   def recover_post_upload(post, sha1)
-    return unless sha1.present?
+    return unless sha1.present? && sha1.length == Upload::SHA1_LENGTH
 
     attributes = {
       post: post,

spec/lib/upload_recovery_spec.rb

@@ -55,6 +55,12 @@ RSpec.describe UploadRecovery do
         )
 
         upload_recovery.recover
+
+        post.update!(
+          raw: "<a href=#{"/uploads/test/original/3X/a/6%0A/#{upload.sha1}.png"}>test</a>"
+        )
+
+        upload_recovery.recover
       end
     end