Adds a rake task for refreshing posts received via email

This is useful when the email_reply_trimmer gem was updated and you want to apply those changes to existing posts.

lib/email/receiver.rb

@@ -620,6 +620,12 @@ module Email
 
     def create_post_with_attachments(options = {})
       # deal with attachments
+      options[:raw] = add_attachments(options[:raw], options[:user].id, options)
+
+      create_post(options)
+    end
+
+    def add_attachments(raw, user_id, options = {})
       attachments.each do |attachment|
         tmp = Tempfile.new(["discourse-email-attachment", File.extname(attachment.filename)])
         begin
@@ -627,19 +633,19 @@ module Email
           File.open(tmp.path, "w+b") { |f| f.write attachment.body.decoded }
           # create the upload for the user
           opts = { for_group_message: options[:is_group_message] }
-          upload = UploadCreator.new(tmp, attachment.filename, opts).create_for(options[:user].id)
+          upload = UploadCreator.new(tmp, attachment.filename, opts).create_for(user_id)
           if upload && upload.errors.empty?
             # try to inline images
-            if attachment.content_type.start_with?("image/")
-              if options[:raw][attachment.url]
-                options[:raw].sub!(attachment.url, upload.url)
-              elsif options[:raw][/\[image:.*?\d+[^\]]*\]/i]
-                options[:raw].sub!(/\[image:.*?\d+[^\]]*\]/i, attachment_markdown(upload))
+            if attachment.content_type&.start_with?("image/")
+              if raw[attachment.url]
+                raw.sub!(attachment.url, upload.url)
+              elsif raw[/\[image:.*?\d+[^\]]*\]/i]
+                raw.sub!(/\[image:.*?\d+[^\]]*\]/i, attachment_markdown(upload))
               else
-                options[:raw] << "\n\n#{attachment_markdown(upload)}\n\n"
+                raw << "\n\n#{attachment_markdown(upload)}\n\n"
               end
             else
-              options[:raw] << "\n\n#{attachment_markdown(upload)}\n\n"
+              raw << "\n\n#{attachment_markdown(upload)}\n\n"
             end
           end
         ensure
@@ -647,7 +653,7 @@ module Email
         end
       end
 
-      create_post(options)
+      raw
     end
 
     def attachment_markdown(upload)

lib/tasks/posts.rake

@@ -238,3 +238,27 @@ task 'posts:defer_all_flags' => :environment do
 
   puts "", "#{flags_deferred} flags deferred!", ""
 end
+
+desc 'Refreshes each post that was received via email'
+task 'posts:refresh_emails', [:topic_id] => [:environment] do |_, args|
+  posts = Post.where.not(raw_email: nil).where(via_email: true)
+  posts = posts.where(topic_id: args[:topic_id]) if args[:topic_id]
+
+  updated = 0
+  total = posts.count
+
+  posts.find_each do |post|
+    receiver = Email::Receiver.new(post.raw_email)
+
+    body, elided = receiver.select_body
+    body = receiver.add_attachments(body || '', post.user_id)
+    body << Email::Receiver.elided_html(elided) if elided.present?
+
+    post.revise(Discourse.system_user, { raw: body }, skip_revision: true, skip_validations: true)
+    updated += 1
+
+    print_status(updated, total)
+  end
+
+  puts "", "Done. #{updated} posts updated.", ""
+end