Model concerns organization into module namespaces (#28149)

app/models/concerns/account/header.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+module Account::Header
+  extend ActiveSupport::Concern
+
+  IMAGE_MIME_TYPES = ['image/jpeg', 'image/png', 'image/gif', 'image/webp'].freeze
+  LIMIT = 2.megabytes
+  MAX_PIXELS = 750_000 # 1500x500px
+
+  class_methods do
+    def header_styles(file)
+      styles = { original: { pixels: MAX_PIXELS, file_geometry_parser: FastGeometryParser } }
+      styles[:static] = { format: 'png', convert_options: '-coalesce', file_geometry_parser: FastGeometryParser } if file.content_type == 'image/gif'
+      styles
+    end
+
+    private :header_styles
+  end
+
+  included do
+    # Header upload
+    has_attached_file :header, styles: ->(f) { header_styles(f) }, convert_options: { all: '+profile "!icc,*" +set date:modify +set date:create +set date:timestamp' }, processors: [:lazy_thumbnail]
+    validates_attachment_content_type :header, content_type: IMAGE_MIME_TYPES
+    validates_attachment_size :header, less_than: LIMIT
+    remotable_attachment :header, LIMIT, suppress_errors: false
+  end
+
+  def header_original_url
+    header.url(:original)
+  end
+
+  def header_static_url
+    header_content_type == 'image/gif' ? header.url(:static) : header_original_url
+  end
+end