class ActionDispatch::PublicExceptions

When called, this middleware renders an error page. By default if an HTML response is expected it will render static error pages from the /public directory. For example when this middleware receives a 500 response it will render the template found in /public/500.html. If an internationalized locale is set, this middleware will attempt to render the template in /public/500.<locale>.html. If an internationalized template is not found it will fall back on /public/500.html.

When a request with a content type other than HTML is made, this middleware will attempt to convert error information into the appropriate response type.

Attributes

public_path[RW]

Public Class Methods

new(public_path) click to toggle source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 17
def initialize(public_path)
  @public_path = public_path
end

Public Instance Methods

call(env) click to toggle source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 21
def call(env)
  request      = ActionDispatch::Request.new(env)
  status       = request.path_info[1..-1].to_i
  begin
    content_type = request.formats.first
  rescue ActionDispatch::Http::MimeNegotiation::InvalidType
    content_type = Mime[:text]
  end
  body = { status: status, error: Rack::Utils::HTTP_STATUS_CODES.fetch(status, Rack::Utils::HTTP_STATUS_CODES[500]) }

  render(status, content_type, body)
end

Private Instance Methods

render(status, content_type, body) click to toggle source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 35
def render(status, content_type, body)
  format = "to_#{content_type.to_sym}" if content_type
  if format && body.respond_to?(format)
    render_format(status, content_type, body.public_send(format))
  else
    render_html(status)
  end
end
render_format(status, content_type, body) click to toggle source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 44
def render_format(status, content_type, body)
  [status, { "Content-Type" => "#{content_type}; charset=#{ActionDispatch::Response.default_charset}",
            "Content-Length" => body.bytesize.to_s }, [body]]
end
render_html(status) click to toggle source
# File lib/action_dispatch/middleware/public_exceptions.rb, line 49
def render_html(status)
  path = "#{public_path}/#{status}.#{I18n.locale}.html"
  path = "#{public_path}/#{status}.html" unless (found = File.exist?(path))

  if found || File.exist?(path)
    render_format(status, "text/html", File.read(path))
  else
    [404, { "X-Cascade" => "pass" }, []]
  end
end