Add follow/mute/block.removed events for Webhooks and associate seemingly fitting permissions with them.

app/models/webhook.rb

@@ -23,6 +23,9 @@ class Webhook < ApplicationRecord
     report.updated
     status.created
     status.updated
+    follow.removed
+    block.removed
+    mute.removed
   ).freeze
 
   attr_writer :current_account
@@ -58,10 +61,12 @@ class Webhook < ApplicationRecord
 
   def self.permission_for_event(event)
     case event
-    when 'account.approved', 'account.created', 'account.updated'
+    when 'account.approved', 'account.created', 'account.updated', 'follow.removed'
       :manage_users
     when 'report.created', 'report.updated'
       :manage_reports
+    when 'block.removed', 'mute.removed'
+      :manage_blocks
     when 'status.created', 'status.updated'
       :view_devops
     end

app/services/unblock_service.rb

@@ -7,6 +7,9 @@ class UnblockService < BaseService
     return unless account.blocking?(target_account)
 
     unblock = account.unblock!(target_account)
+
+    TriggerWebhookWithObjectWorker.perform_async('block.removed', Oj.to_json({ 'account_id': unblock.account_id, 'target_account_id': unblock.target_account_id, 'id': unblock.id }))
+
     create_notification(unblock) if !target_account.local? && target_account.activitypub?
     unblock
   end

app/services/unfollow_service.rb

@@ -29,6 +29,8 @@ class UnfollowService < BaseService
 
     follow.destroy!
 
+    TriggerWebhookWithObjectWorker.perform_async('follow.removed', Oj.to_json({ 'account_id': follow.account_id, 'target_account_id': follow.target_account_id, 'id': follow.id }))
+
     create_notification(follow) if !@target_account.local? && @target_account.activitypub?
     create_reject_notification(follow) if @target_account.local? && !@source_account.local? && @source_account.activitypub?
     UnmergeWorker.perform_async(@target_account.id, @source_account.id) unless @options[:skip_unmerge]

app/services/unmute_service.rb

@@ -4,7 +4,9 @@ class UnmuteService < BaseService
   def call(account, target_account)
     return unless account.muting?(target_account)
 
-    account.unmute!(target_account)
+    unmute = account.unmute!(target_account)
+
+    TriggerWebhookWithObjectWorker.perform_async('mute.removed', Oj.to_json({ 'account_id': unmute.account_id, 'target_account_id': unmute.target_account_id, 'id': unmute.id }))
 
     MergeWorker.perform_async(target_account.id, account.id) if account.following?(target_account)
   end

app/workers/trigger_webhook_with_object_worker.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class TriggerWebhookWithObjectWorker
+  include Sidekiq::Worker
+
+  # Triggers a webhook for a destructive event (e.g. an unfollow),
+  # where the object cannot be queried from the database.
+  # @param event [String] type of the event
+  # @param object [String] event payload serialized with JSON
+  def perform(event, object)
+    WebhookService.new.call(event, Oj.load(object))
+  end
+end