Fix actions endpoint for block dropdowns (#10)

Author: maths22

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 * [#13](https://github.com/slack-ruby/slack-ruby-bot-server-events/pull/13): Replace Travis CI with Github Actions - [@CrazyOptimist](https://github.com/CrazyOptimist).
 * Your contribution here.
+* [#10](https://github.com/slack-ruby/slack-ruby-bot-server-events/pull/10): Fix actions endpoint for block dropdowns - [@maths22](https://github.com/maths22).
 
 #### 0.3.1 (2/4/2021)
 

lib/slack-ruby-bot-server-events/api/endpoints/slack/actions_endpoint.rb

@@ -40,7 +40,7 @@ class ActionsEndpoint < Grape::API
 
                 given type: ->(val) { val == 'block_actions' } do
                   optional :trigger_id, type: String
-                  requires :response_url, type: String
+                  optional :response_url, type: String
                   requires :token, type: String
                   requires :user, type: Hash do
                     requires :id, type: String

spec/slack-ruby-bot-server-events/api/endpoints/slack/actions_endpoint_spec.rb

@@ -113,6 +113,18 @@
         }
       end
 
+      let(:payload_without_response_url) do
+        {
+          type: 'block_actions',
+          user: { id: 'user_id' },
+          team: { id: 'team_id' },
+          token: 'deprecated',
+          actions: [
+            { type: 'button', action_id: 'action_id' }
+          ]
+        }
+      end
+
       context 'with an action handler' do
         before do
           SlackRubyBotServer::Events.configure do |config|
@@ -128,6 +140,13 @@
           response = JSON.parse(last_response.body)
           expect(response).to eq('text' => 'block_actions/action_id')
         end
+
+        it 'performs action when payload has no response url' do
+          post '/api/slack/action', payload: payload_without_response_url.to_json
+          expect(last_response.status).to eq 201
+          response = JSON.parse(last_response.body)
+          expect(response).to eq('text' => 'block_actions/action_id')
+        end
       end
 
       context 'with a block type actions handler' do