1 files changed, 77 insertions, 0 deletions
diff --git a/lib/gitlab/slash_commands/presenters/base.rb b/lib/gitlab/slash_commands/presenters/base.rb
new file mode 100644
index 00000000000..27696436574
--- /dev/null
+++ b/lib/gitlab/slash_commands/presenters/base.rb
@@ -0,0 +1,77 @@
+module Gitlab
+  module SlashCommands
+    module Presenters
+      class Base
+        include Gitlab::Routing.url_helpers
+
+        def initialize(resource = nil)
+          @resource = resource
+        end
+
+        def display_errors
+          message = header_with_list("The action was not successful, because:", @resource.errors.full_messages)
+
+          ephemeral_response(text: message)
+        end
+
+        private
+
+        def header_with_list(header, items)
+          message = [header]
+
+          items.each do |item|
+            message << "- #{item}"
+          end
+
+          message.join("\n")
+        end
+
+        def ephemeral_response(message)
+          response = {
+            response_type: :ephemeral,
+            status: 200
+          }.merge(message)
+
+          format_response(response)
+        end
+
+        def in_channel_response(message)
+          response = {
+            response_type: :in_channel,
+            status: 200
+          }.merge(message)
+
+          format_response(response)
+        end
+
+        def format_response(response)
+          response[:text] = format(response[:text]) if response.key?(:text)
+
+          if response.key?(:attachments)
+            response[:attachments].each do |attachment|
+              attachment[:pretext] = format(attachment[:pretext]) if attachment[:pretext]
+              attachment[:text] = format(attachment[:text]) if attachment[:text]
+            end
+          end
+
+          response
+        end
+
+        # Convert Markdown to slacks format
+        def format(string)
+          Slack::Notifier::LinkFormatter.format(string)
+        end
+
+        def resource_url
+          url_for(
+            [
+              @resource.project.namespace.becomes(Namespace),
+              @resource.project,
+              @resource
+            ]
+          )
+        end
+      end
+    end
+  end
+end