Extract a github pull request class

src/api/app/models/github.rb

@@ -0,0 +1,30 @@
+class Github
+  attr_reader :event, :webhook_payload
+
+  def initialize(event, webhook_payload)
+    @event = event
+    @webhook_payload = webhook_payload
+  end
+
+  def default_payload
+    {
+      scm: 'github',
+      event: event,
+      api_endpoint: api_endpoint
+    }
+  end
+
+  private
+
+  def api_endpoint
+    sender_url = webhook_payload.dig(:sender, :url)
+    return unless sender_url
+
+    host = URI.parse(sender_url).host
+    if host.start_with?('api.github.com')
+      "https://#{host}"
+    else
+      "https://#{host}/api/v3/"
+    end
+  end
+end

src/api/app/models/github/pull_request.rb

@@ -0,0 +1,13 @@
+class Github::PullRequest < Github
+  def payload
+    default_payload.merge(
+      commit_sha: webhook_payload.dig(:pull_request, :head, :sha),
+      pr_number: webhook_payload[:number],
+      source_branch: webhook_payload.dig(:pull_request, :head, :ref),
+      target_branch: webhook_payload.dig(:pull_request, :base, :ref),
+      action: webhook_payload[:action],
+      source_repository_full_name: webhook_payload.dig(:pull_request, :head, :repo, :full_name),
+      target_repository_full_name: webhook_payload.dig(:pull_request, :base, :repo, :full_name)
+    )
+  end
+end

src/api/app/models/github_payload_extractor.rb

@@ -16,15 +16,7 @@ def payload
 
     case event
     when 'pull_request'
-      payload.merge!({
-                       commit_sha: webhook_payload.dig(:pull_request, :head, :sha),
-                       pr_number: webhook_payload[:number],
-                       source_branch: webhook_payload.dig(:pull_request, :head, :ref),
-                       target_branch: webhook_payload.dig(:pull_request, :base, :ref),
-                       action: webhook_payload[:action],
-                       source_repository_full_name: webhook_payload.dig(:pull_request, :head, :repo, :full_name),
-                       target_repository_full_name: webhook_payload.dig(:pull_request, :base, :repo, :full_name)
-                     })
+      return Github::PullRequest.new(event, webhook_payload).payload
     when 'push' # GitHub doesn't have different push events for commits and tags
       github_payload_push(payload)
     end