discourse/lib/middleware/missing_avatars.rb

# frozen_string_literal: true

module Middleware
  # In development mode, it is common to use a database from a production site for testing
  # with their data. Unfortunately, you can end up with dozens of missing avatar requests
  # due to the files not being present locally. This middleware, only enabled in development
  # mode, will replace those with an appropriate image.
  class MissingAvatars
    def initialize(app, settings = {})
      @app = app
    end

    def call(env)
      if (env["REQUEST_PATH"] =~ %r{^/uploads/default/avatars})
        path = "#{Rails.root}/public#{env["REQUEST_PATH"]}"
        unless File.exist?(path)
          default_image = "#{Rails.root}/public/images/d-logo-sketch-small.png"
          return 200, { "Content-Type" => "image/png" }, [File.read(default_image)]
        end
      end

      status, headers, response = @app.call(env)
      [status, headers, response]
    end
  end
end