FEATURE: Add a plugin callback when editing a post

FIX: Wrap PostRevisor database work in a transaction

lib/post_creator.rb

@@ -69,6 +69,7 @@ class PostCreator
       setup_topic
       setup_post
       rollback_if_host_spam_detected
+      plugin_callbacks
       save_post
       extract_links
       store_unique_post_key
@@ -113,7 +114,6 @@ class PostCreator
 
     post.cooked ||= post.cook(post.raw, cooking_options)
     post.sort_order = post.post_number
-    DiscourseEvent.trigger(:before_create_post, post)
     post.last_version_at ||= Time.now
   end
 
@@ -157,6 +157,11 @@ class PostCreator
     end
   end
 
+  def plugin_callbacks
+    DiscourseEvent.trigger :before_create_post, @post
+    DiscourseEvent.trigger :validate_post, @post
+  end
+
   def track_latest_on_category
     return unless @post && @post.errors.count == 0 && @topic && @topic.category_id
 

lib/post_revisor.rb

@@ -22,13 +22,18 @@ class PostRevisor
     @new_raw = TextCleaner.normalize_whitespaces(new_raw).strip
 
     return false unless should_revise?
-    @post.acting_user = @editor
+
-    revise_post
+    Post.transaction do
-    update_category_description
+      @post.acting_user = @editor
-    update_topic_excerpt
+      revise_post
-    post_process_post
+      plugin_callbacks
-    update_topic_word_counts
+      update_category_description
-    @post.advance_draft_sequence
+      update_topic_excerpt
+      post_process_post
+      update_topic_word_counts
+      @post.advance_draft_sequence
+    end
+
     PostAlerter.new.after_save_post(@post)
     publish_revision
     BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
@@ -61,6 +66,11 @@ class PostRevisor
     end
   end
 
+  def plugin_callbacks
+    DiscourseEvent.trigger :before_edit_post, @post
+    DiscourseEvent.trigger :validate_post, @post
+  end
+
   def get_revised_at
     @opts[:revised_at] || Time.now
   end