FEATURE: Webhook for user destroyed event (#6124)

app/models/user.rb

@@ -115,6 +115,7 @@ class User < ActiveRecord::Base
   after_save :expire_old_email_tokens
   after_save :index_search
   after_commit :trigger_user_created_event, on: :create
+  after_commit :trigger_user_destroyed_event, on: :destroy
 
   before_destroy do
     # These tables don't have primary keys, so destroying them with activerecord is tricky:
@@ -1270,6 +1271,11 @@ class User < ActiveRecord::Base
     true
   end
 
+  def trigger_user_destroyed_event
+    DiscourseEvent.trigger(:user_destroyed, self)
+    true
+  end
+
   def set_skip_validate_email
     if self.primary_email
       self.primary_email.skip_validate_email = !should_validate_email_address?

config/initializers/012-web_hook_events.rb

@@ -41,6 +41,7 @@ end
   user_logged_in
   user_approved
   user_updated
+  user_destroyed
 ).each do |event|
   DiscourseEvent.on(event) do |user|
     WebHook.enqueue_object_hooks(:user, user, event)

spec/models/web_hook_spec.rb

@@ -291,6 +291,13 @@ describe WebHook do
       expect(job_args["event_name"]).to eq("user_logged_in")
       payload = JSON.parse(job_args["payload"])
       expect(payload["id"]).to eq(user.id)
+
+      UserDestroyer.new(Discourse.system_user).destroy(user)
+      job_args = Jobs::EmitWebHookEvent.jobs.last["args"].first
+
+      expect(job_args["event_name"]).to eq("user_destroyed")
+      payload = JSON.parse(job_args["payload"])
+      expect(payload["id"]).to eq(user.id)
     end
 
     it 'should enqueue the right hooks for category events' do

spec/services/user_destroyer_spec.rb

@@ -55,6 +55,13 @@ describe UserDestroyer do
           UserDestroyer.new(@admin).destroy(@user, destroy_opts.merge(quiet: true))
         }.to_not change { UserHistory.where(action: UserHistory.actions[:delete_user]).count }
       end
+
+      it 'triggers a extensibility event' do
+        event = DiscourseEvent.track_events { destroy }.last
+
+        expect(event[:event_name]).to eq(:user_destroyed)
+        expect(event[:params].first).to eq(@user)
+      end
     end
 
     shared_examples "email block list" do