Merge branch 'dev_aliyun' of https://bdgit.educoder.net/Hjqreturn/educoder into dev_aliyun

app/controllers/attachments_controller.rb

@@ -17,9 +17,12 @@ class AttachmentsController < ApplicationController
       redirect_to @file.cloud_url and return
     end
 
-    pdf_attachment = params[:disposition] || "attachment"
-    if pdf_attachment == "inline"
+    type_attachment = params[:disposition] || "attachment"
+    if type_attachment == "inline"
       send_file absolute_path(local_path(@file)),filename: @file.title, disposition: 'inline',type: 'application/pdf'
+    elsif type_attachment == "MP4"
+      response.header["Accept-Ranges"] = "bytes"
+      send_file absolute_path(local_path(@file)),filename: @file.title,type: @file.content_type.presence || 'application/octet-stream', x_sendfile: true
     else
       send_file(absolute_path(local_path(@file)), filename: @file.title,stream:false, type: @file.content_type.presence || 'application/octet-stream')
     end