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module ActionDispatch
# 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.
class PublicExceptions
attr_accessor :public_path
def initialize(public_path)
@public_path = public_path
end
def call(env)
request = ActionDispatch::Request.new(env)
status = request.path_info[1..-1].to_i
content_type = request.formats.first
body = { status: status, error: Rack::Utils::HTTP_STATUS_CODES.fetch(status, Rack::Utils::HTTP_STATUS_CODES[500]) }
render(status, content_type, body)
end
private
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
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
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
end
end
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