fix: Attachment sent from slack doesn't reach to chatwoot (#7852)

app/models/concerns/slack_message_creation.rb

@@ -0,0 +1,69 @@
+module SlackMessageCreation
+  extend ActiveSupport::Concern
+
+  private
+
+  def create_message
+    return unless conversation
+
+    build_message
+    @message.save!
+    { status: 'success' }
+  rescue Slack::Web::Api::Errors::MissingScope => e
+    ChatwootExceptionTracker.new(e, account: conversation.account).capture_exception
+    disable_and_reauthorize
+  end
+
+  def disable_and_reauthorize
+    integration_hook.prompt_reauthorization!
+    integration_hook.disable
+  end
+
+  def build_message
+    @message = conversation.messages.build(
+      message_type: :outgoing,
+      account_id: conversation.account_id,
+      inbox_id: conversation.inbox_id,
+      content: Slack::Messages::Formatting.unescape(params[:event][:text] || ''),
+      external_source_id_slack: params[:event][:ts],
+      private: private_note?,
+      sender: sender
+    )
+    process_attachments(params[:event][:files]) if attachments_present?
+  end
+
+  def attachments_present?
+    params[:event][:files].present?
+  end
+
+  def process_attachments(attachments)
+    attachments.each do |attachment|
+      tempfile = Down::NetHttp.download(attachment[:url_private], headers: { 'Authorization' => "Bearer #{integration_hook.access_token}" })
+
+      attachment_params = {
+        file_type: file_type(attachment),
+        account_id: @message.account_id,
+        external_url: attachment[:url_private],
+        file: {
+          io: tempfile,
+          filename: tempfile.original_filename,
+          content_type: tempfile.content_type
+        }
+      }
+
+      attachment_obj = @message.attachments.new(attachment_params)
+      attachment_obj.file.content_type = attachment[:mimetype]
+    end
+  end
+
+  def file_type(attachment)
+    return if attachment[:mimetype] == 'text/plain'
+
+    case attachment[:filetype]
+    when 'png', 'jpeg', 'gif', 'bmp', 'tiff', 'jpg'
+      :image
+    when 'pdf'
+      :file
+    end
+  end
+end