1 files changed, 82 insertions, 0 deletions
diff --git a/actiontext/lib/action_text/attachable.rb b/actiontext/lib/action_text/attachable.rb
new file mode 100644
index 0000000000..38cd24aa8d
--- /dev/null
+++ b/actiontext/lib/action_text/attachable.rb
@@ -0,0 +1,82 @@
+# frozen_string_literal: true
+
+module ActionText
+  module Attachable
+    extend ActiveSupport::Concern
+
+    LOCATOR_NAME = "attachable"
+
+    class << self
+      def from_node(node)
+        if attachable = attachable_from_sgid(node["sgid"])
+          attachable
+        elsif attachable = ActionText::Attachables::ContentAttachment.from_node(node)
+          attachable
+        elsif attachable = ActionText::Attachables::RemoteImage.from_node(node)
+          attachable
+        else
+          ActionText::Attachables::MissingAttachable
+        end
+      end
+
+      def from_attachable_sgid(sgid, options = {})
+        method = sgid.is_a?(Array) ? :locate_many_signed : :locate_signed
+        record = GlobalID::Locator.public_send(method, sgid, options.merge(for: LOCATOR_NAME))
+        record || raise(ActiveRecord::RecordNotFound)
+      end
+
+      private
+        def attachable_from_sgid(sgid)
+          from_attachable_sgid(sgid)
+        rescue ActiveRecord::RecordNotFound
+          nil
+        end
+    end
+
+    class_methods do
+      def from_attachable_sgid(sgid)
+        ActionText::Attachable.from_attachable_sgid(sgid, only: self)
+      end
+    end
+
+    def attachable_sgid
+      to_sgid(expires_in: nil, for: LOCATOR_NAME).to_s
+    end
+
+    def attachable_content_type
+      try(:content_type) || "application/octet-stream"
+    end
+
+    def attachable_filename
+      filename.to_s if respond_to?(:filename)
+    end
+
+    def attachable_filesize
+      try(:byte_size) || try(:filesize)
+    end
+
+    def attachable_metadata
+      try(:metadata) || {}
+    end
+
+    def previewable_attachable?
+      false
+    end
+
+    def as_json(*)
+      super.merge(attachable_sgid: attachable_sgid)
+    end
+
+    def to_rich_text_attributes(attributes = {})
+      attributes.dup.tap do |attrs|
+        attrs[:sgid] = attachable_sgid
+        attrs[:content_type] = attachable_content_type
+        attrs[:previewable] = true if previewable_attachable?
+        attrs[:filename] = attachable_filename
+        attrs[:filesize] = attachable_filesize
+        attrs[:width] = attachable_metadata[:width]
+        attrs[:height] = attachable_metadata[:height]
+      end.compact
+    end
+  end
+end