Module: Sprockets::Server

Included in:
Base
Defined in:
lib/sprockets/server.rb

Overview

`Server` is a concern mixed into `Environment` and `Index` that provides a Rack compatible `call` interface and url generation helpers.

Instance Method Summary collapse

Instance Method Details

#call(env) ⇒ Object

`call` implements the Rack 1.x specification which accepts an `env` Hash and returns a three item tuple with the status code, headers, and body.

Mapping your environment at a url prefix will serve all assets in the path.

map "/assets" do
  run Sprockets::Environment.new
end

A request for `“/assets/foo/bar.js”` will search your environment for `“foo/bar.js”`.


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# File 'lib/sprockets/server.rb', line 22

def call(env)
  start_time = Time.now.to_f
  time_elapsed = lambda { ((Time.now.to_f - start_time) * 1000).to_i }

  msg = "Served asset #{env['PATH_INFO']} -"

  # Mark session as "skipped" so no `Set-Cookie` header is set
  env['rack.session.options'] ||= {}
  env['rack.session.options'][:defer] = true
  env['rack.session.options'][:skip] = true

  # Extract the path from everything after the leading slash
  path = unescape(env['PATH_INFO'].to_s.sub(/^\//, ''))

  # Strip fingerprint
  if fingerprint = path_fingerprint(path)
    path = path.sub("-#{fingerprint}", '')
  end

  # URLs containing a `".."` are rejected for security reasons.
  if forbidden_request?(path)
    return forbidden_response
  end

  # Look up the asset.
  asset = find_asset(path, :bundle => !body_only?(env))

  # `find_asset` returns nil if the asset doesn't exist
  if asset.nil?
    logger.info "#{msg} 404 Not Found (#{time_elapsed.call}ms)"

    # Return a 404 Not Found
    not_found_response

  # Check request headers `HTTP_IF_NONE_MATCH` against the asset digest
  elsif etag_match?(asset, env)
    logger.info "#{msg} 304 Not Modified (#{time_elapsed.call}ms)"

    # Return a 304 Not Modified
    not_modified_response(asset, env)

  else
    logger.info "#{msg} 200 OK (#{time_elapsed.call}ms)"

    # Return a 200 with the asset contents
    ok_response(asset, env)
  end
rescue Exception => e
  logger.error "Error compiling asset #{path}:"
  logger.error "#{e.class.name}: #{e.message}"

  case content_type_of(path)
  when "application/javascript"
    # Re-throw JavaScript asset exceptions to the browser
    logger.info "#{msg} 500 Internal Server Error\n\n"
    return javascript_exception_response(e)
  when "text/css"
    # Display CSS asset exceptions in the browser
    logger.info "#{msg} 500 Internal Server Error\n\n"
    return css_exception_response(e)
  else
    raise
  end
end