add support for upload preprocessing

app/controllers/uploads_controller.rb

@@ -3,31 +3,14 @@ class UploadsController < ApplicationController
   respond_to :html, :xml, :json, :js
 
   def new
-    @upload = Upload.new
     @upload_notice_wiki = WikiPage.titled(Danbooru.config.upload_notice_wiki_page).first
-    if params[:url]
-      download = Downloads::File.new(params[:url])
-      @normalized_url, _, _ = download.before_download(params[:url], {})
-      @post = find_post_by_url(@normalized_url)
-
-      begin
-        @source = Sources::Site.new(params[:url], :referer_url => params[:ref])
-        @remote_size = download.size
-      rescue Exception
-      end
-    end
+    @upload, @post, @source, @normalized_url, @remote_size = UploadService::ControllerHelper.prepare(params[:url], params[:ref])
     respond_with(@upload)
   end
 
   def batch
     @url = params.dig(:batch, :url) || params[:url]
-    @source = nil
-
-    if @url
-      @source = Sources::Site.new(@url, :referer_url => params[:ref])
-      @source.get
-    end
-
+    @source = UploadService::ControllerHelper.batch(@url, params[:ref])
     respond_with(@source)
   end
 
@@ -57,14 +40,11 @@ class UploadsController < ApplicationController
   end
 
   def create
-    @upload = Upload.create(upload_params)
+    @service = UploadService.new(upload_params)
+    @upload = @service.start!
 
-    if @upload.errors.empty?
-      post = @upload.process!
-
-      if post.present? && post.valid? && post.warnings.any?
-        flash[:notice] = post.warnings.full_messages.join(".\n \n")
-      end
+    if @service.warnings.any?
+      flash[:notice] = @service.warnings.join(".\n \n")
     end
 
     save_recent_tags
@@ -73,14 +53,6 @@ class UploadsController < ApplicationController
 
   private
 
-  def find_post_by_url(normalized_url)
-    if normalized_url.nil?
-      Post.where("SourcePattern(lower(posts.source)) = ?", params[:url]).first
-    else
-      Post.where("SourcePattern(lower(posts.source)) IN (?)", [params[:url], @normalized_url]).first
-    end
-  end
-
   def save_recent_tags
     if @upload
       tags = Tag.scan_tags(@upload.tag_string)
@@ -94,7 +66,7 @@ class UploadsController < ApplicationController
     permitted_params = %i[
       file source tag_string rating status parent_id artist_commentary_title
       artist_commentary_desc include_artist_commentary referer_url
-      md5_confirmation as_pending 
+      md5_confirmation as_pending
     ]
 
     params.require(:upload).permit(permitted_params)