add: download pdf from trace server

app/services/trace/pdf_report_service.rb

@@ -1,4 +1,7 @@
 # 代码溯源 导出pdf
+require 'open-uri'
+require 'fileutils'
+
 class Trace::PdfReportService < Trace::ClientService
   
   attr_accessor :token, :task_id 
@@ -9,15 +12,23 @@ class Trace::PdfReportService < Trace::ClientService
   end
 
   def call 
-    result = authed_get(token, url, request_params)
-    response = render_response(result)
+    content = URI.open("#{domain}#{base_url}#{url}?task_id#{task_id}", "Authorization" => token)
+    if content.is_a?(Tempfile)
+      check_file_path
+      IO.copy_stream(content, "#{save_path}/#{task_id}.zip")
+      return {code: 200, download_url: "/trace_task_results/#{task_id}.zip"}
+    else 
+      return {code: 404}
+    end
   end
 
   private 
-  def request_params 
-    {
-      task_id: task_id
-    }
+  def check_file_path 
+    FileUtils.mkdir_p save_path
+  end
+
+  def save_path 
+    "public/trace_task_results"
   end
 
   def url