Extract pasted base64 images from RTE texts [SCI-5098]

app/models/concerns/tiny_mce_images.rb

@@ -10,6 +10,7 @@ module TinyMceImages
              dependent: :destroy
 
     before_save :clean_tiny_mce_image_urls
+    before_save :extract_base64_images
 
     def prepare_for_report(field, base64_encoded_imgs = false)
       description = self[field]
@@ -162,5 +163,42 @@ module TinyMceImages
       end
       self[object_field] = parsed_description.to_html if image_changed
     end
+
+    def extract_base64_images
+      # extracts and uploads any base64 encoded images,
+      # so they get stored as files instead of directly in the text
+
+      object_field = Extends::RICH_TEXT_FIELD_MAPPINGS[self.class.name]
+
+      text = public_send(object_field)
+
+      return unless text
+
+      ActiveRecord::Base.transaction do
+        text.scan(/src="(data:image\/[^;]+;base64[^"]+)"/i).flatten.each do |base64_src|
+          base64_data = base64_src.split('base64,').last
+
+          tiny_image = TinyMceAsset.create!(
+            team: @team,
+            object: self,
+            saved: true
+          )
+
+          tiny_image.image.attach(
+            io: StringIO.new(Base64.decode64(base64_data)),
+            filename: SecureRandom.hex(32)
+          )
+
+          encoded_id = Base62.encode(tiny_image.id)
+
+          text.gsub!(
+            "#{base64_src}\"",
+            "\" data-mce-token=\"#{encoded_id}\" alt=\"description-#{encoded_id}\""
+          )
+        end
+
+        assign_attributes(object_field => text)
+      end
+    end
   end
 end

app/models/step.rb

@@ -1,7 +1,6 @@
 class Step < ApplicationRecord
   include SearchableModel
   include SearchableByNameModel
-  include TinyMceImages
   include ViewableModel
 
   attr_accessor :skip_position_adjust # to be used in bulk deletion

app/models/tiny_mce_asset.rb

@@ -21,7 +21,14 @@ class TinyMceAsset < ApplicationRecord
   validates :estimated_size, presence: true
 
   def self.update_images(object, images, current_user)
-    images = JSON.parse(images)
+    # image ids that are present in text
+    text_images =
+      object.public_send(Extends::RICH_TEXT_FIELD_MAPPINGS[self.class.name])
+            .scan(/data-mce-token="([^"]+)"/)
+            .flatten
+
+    images = JSON.parse(images) + text_images
+
     current_images = object.tiny_mce_assets.pluck(:id)
     images_to_delete = current_images.reject do |x|
       (images.include? Base62.encode(x))