Gab Social. All are welcome.

app/controllers/api/push_controller.rb

@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+class Api::PushController < Api::BaseController
+  include SignatureVerification
+
+  def update
+    response, status = process_push_request
+    render plain: response, status: status
+  end
+
+  private
+
+  def process_push_request
+    case hub_mode
+    when 'subscribe'
+      Pubsubhubbub::SubscribeService.new.call(account_from_topic, hub_callback, hub_secret, hub_lease_seconds, verified_domain)
+    when 'unsubscribe'
+      Pubsubhubbub::UnsubscribeService.new.call(account_from_topic, hub_callback)
+    else
+      ["Unknown mode: #{hub_mode}", 422]
+    end
+  end
+
+  def hub_mode
+    params['hub.mode']
+  end
+
+  def hub_topic
+    params['hub.topic']
+  end
+
+  def hub_callback
+    params['hub.callback']
+  end
+
+  def hub_lease_seconds
+    params['hub.lease_seconds']
+  end
+
+  def hub_secret
+    params['hub.secret']
+  end
+
+  def account_from_topic
+    if hub_topic.present? && local_domain? && account_feed_path?
+      Account.find_local(hub_topic_params[:username])
+    end
+  end
+
+  def hub_topic_params
+    @_hub_topic_params ||= Rails.application.routes.recognize_path(hub_topic_uri.path)
+  end
+
+  def hub_topic_uri
+    @_hub_topic_uri ||= Addressable::URI.parse(hub_topic).normalize
+  end
+
+  def local_domain?
+    TagManager.instance.web_domain?(hub_topic_domain)
+  end
+
+  def verified_domain
+    return signed_request_account.domain if signed_request_account
+  end
+
+  def hub_topic_domain
+    hub_topic_uri.host + (hub_topic_uri.port ? ":#{hub_topic_uri.port}" : '')
+  end
+
+  def account_feed_path?
+    hub_topic_params[:controller] == 'accounts' && hub_topic_params[:action] == 'show' && hub_topic_params[:format] == 'atom'
+  end
+end