move cover image stuff to its own concern and add processing

app/javascript/gabsocial/actions/group_editor.js

@@ -35,7 +35,7 @@ export const create = (title, description, coverImage, routerHistory) => (dispat
 	const formData = new FormData();
 	formData.append('title', title);
 	formData.append('description', description);
-	debugger;
+
 	if (coverImage !== null) {
 		formData.append('cover_image', coverImage);
 	}

app/models/concerns/group_cover_image.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module GroupCoverImage
+  extend ActiveSupport::Concern
+  
+  LIMIT            = 4.megabytes
+  IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
+
+  class_methods do
+    def cover_image_styles(file)
+      styles = { original: { geometry: '1200x475#', file_geometry_parser: FastGeometryParser } }
+      styles[:static] = { geometry: '1200x475#', format: 'png', convert_options: '-coalesce', file_geometry_parser: FastGeometryParser } if file.content_type == 'image/gif'
+      styles
+    end
+
+    private :cover_image_styles
+  end
+
+  included do
+    has_attached_file :cover_image, styles: ->(f) { cover_image_styles(f) }, convert_options: { all: '-strip' }, processors: [:lazy_thumbnail]
+    validates_attachment_content_type :cover_image, content_type: IMAGE_MIME_TYPES
+    validates_attachment_size :cover_image, less_than: LIMIT
+    remotable_attachment :cover_image, LIMIT
+  end
+
+  def cover_image_original_url
+    cover_image.url(:original)
+  end
+
+  def cover_image_static_url
+    cover_image_content_type == 'image/gif' ? cover_image.url(:static) : cover_image_original_url
+  end
+end

app/models/group.rb

@@ -20,6 +20,7 @@
 class Group < ApplicationRecord
   include Paginable
   include GroupInteractions
+  include GroupCoverImage
 
   PER_ACCOUNT_LIMIT = 50
 
@@ -34,14 +35,6 @@ class Group < ApplicationRecord
   validates :title, presence: true
   validates :description, presence: true
 
-  LIMIT            = 4.megabytes
-  IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
-
-  has_attached_file :cover_image
-  validates_attachment_content_type :cover_image, content_type: IMAGE_MIME_TYPES
-  validates_attachment_size :cover_image, less_than: LIMIT
-  remotable_attachment :cover_image, LIMIT
-
   validates_each :account_id, on: :create do |record, _attr, value|
     record.errors.add(:base, I18n.t('groups.errors.limit')) if Group.where(account_id: value).count >= PER_ACCOUNT_LIMIT
   end