port tootsuite#12262 to monsterfork: Fix remote media descriptions being cut off at 420 chars

* Fix remote media descriptions being cut off at 420 chars

Fixes #12258

* Fix tests

3 files changed, 31 insertions, 3 deletions

diff --git a/app/models/media_attachment.rb b/app/models/media_attachment.rb
index f8e925942..1744ee58c 100644
--- a/app/models/media_attachment.rb
+++ b/app/models/media_attachment.rb
@@ -26,6 +26,8 @@ class MediaAttachment < ApplicationRecord
 
   enum type: [:image, :gifv, :video, :audio, :unknown]
 
+  MAX_DESCRIPTION_LENGTH = 6666
+
   IMAGE_FILE_EXTENSIONS = %w(.jpg .jpeg .png .gif .webp).freeze
   VIDEO_FILE_EXTENSIONS = %w(.webm .mp4 .m4v .mov).freeze
   AUDIO_FILE_EXTENSIONS = %w(.ogg .oga .mp3 .wav .flac .opus .aac .m4a .3gp).freeze
@@ -243,7 +245,7 @@ class MediaAttachment < ApplicationRecord
   end
 
   def prepare_description
-    self.description = description.strip[0...420] unless description.nil?
+    self.description = description.strip[0...MAX_DESCRIPTION_LENGTH] unless description.nil?
   end
 
   def set_type_and_extension
diff --git a/spec/lib/activitypub/activity/create_spec.rb b/spec/lib/activitypub/activity/create_spec.rb
index d539a97ea..43ea691a4 100644
--- a/spec/lib/activitypub/activity/create_spec.rb
+++ b/spec/lib/activitypub/activity/create_spec.rb
@@ -262,6 +262,32 @@ RSpec.describe ActivityPub::Activity::Create do
         end
       end
 
+
+      context 'with media attachments with long description' do
+        let(:object_json) do
+          {
+            id: [ActivityPub::TagManager.instance.uri_for(sender), '#bar'].join,
+            type: 'Note',
+            content: 'Lorem ipsum',
+            attachment: [
+              {
+                type: 'Document',
+                mediaType: 'image/png',
+                url: 'http://example.com/attachment.png',
+                name: '*' * 1500,
+              },
+            ],
+          }
+        end
+
+        it 'creates status' do
+          status = sender.statuses.first
+
+          expect(status).to_not be_nil
+          expect(status.media_attachments.map(&:description)).to include('*' * 1500)
+        end
+      end
+
       context 'with media attachments with focal points' do
         let(:object_json) do
           {
diff --git a/spec/models/media_attachment_spec.rb b/spec/models/media_attachment_spec.rb
index e823f1713..456bc4216 100644
--- a/spec/models/media_attachment_spec.rb
+++ b/spec/models/media_attachment_spec.rb
@@ -151,10 +151,10 @@ RSpec.describe MediaAttachment, type: :model do
   end
 
   describe 'descriptions for remote attachments' do
-    it 'are cut off at 666 characters' do
+    it 'are cut off at 1500 characters' do
       media = Fabricate(:media_attachment, description: 'foo' * 1000, remote_url: 'http://example.com/blah.jpg')
 
-      expect(media.description.size).to be <= 666
+      expect(media.description.size).to be <= 1_500
     end
   end
 end