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module ActionDispatch
# A simple Rack application that renders exceptions in the given public path.
class PublicExceptions
attr_accessor :public_path
def initialize(public_path)
@public_path = public_path
end
def call(env)
exception = env["action_dispatch.exception"]
status = env["PATH_INFO"][1..-1]
request = ActionDispatch::Request.new(env)
content_type = request.formats.first
format = content_type && "to_#{content_type.to_sym}"
body = { :status => status, :error => exception.message }
render(status, body, :format => format, :content_type => content_type)
end
private
def render(status, body, options)
format = options[:format]
if format && body.respond_to?(format)
render_format(status, body.public_send(format), options)
else
render_html(status)
end
end
def render_format(status, body, options)
[status, {'Content-Type' => "#{options[:content_type]}; charset=#{ActionDispatch::Response.default_charset}",
'Content-Length' => body.bytesize.to_s}, [body]]
end
def render_html(status)
found = false
path = "#{public_path}/#{status}.#{I18n.locale}.html" if I18n.locale
path = "#{public_path}/#{status}.html" unless path && (found = File.exist?(path))
if found || File.exist?(path)
body = File.read(path)
[status, {'Content-Type' => "text/html; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]]
else
[404, { "X-Cascade" => "pass" }, []]
end
end
end
end
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