eldr-rb/eldr-responders

module Eldr
  module Responders
    module StatusCodes
      # Defines the standard HTTP status codes, by integer, with their
      # corresponding default message texts.
      # Source: http://www.iana.org/assignments/http-status-codes
      STATUS_CODES = {
        100 => "Continue",
        101 => "Switching Protocols",
        102 => "Processing",

        200 => "OK",
        201 => "Created",
        202 => "Accepted",
        203 => "Non-Authoritative Information",
        204 => "No Content",
        205 => "Reset Content",
        206 => "Partial Content",
        207 => "Multi-Status",
        226 => "IM Used",

        300 => "Multiple Choices",
        301 => "Moved Permanently",
        302 => "Found",
        303 => "See Other",
        304 => "Not Modified",
        305 => "Use Proxy",
        307 => "Temporary Redirect",

        400 => "Bad Request",
        401 => "Unauthorized",
        402 => "Payment Required",
        403 => "Forbidden",
        404 => "Not Found",
        405 => "Method Not Allowed",
        406 => "Not Acceptable",
        407 => "Proxy Authentication Required",
        408 => "Request Timeout",
        409 => "Conflict",
        410 => "Gone",
        411 => "Length Required",
        412 => "Precondition Failed",
        413 => "Request Entity Too Large",
        414 => "Request-URI Too Long",
        415 => "Unsupported Media Type",
        416 => "Requested Range Not Satisfiable",
        417 => "Expectation Failed",
        422 => "Unprocessable Entity",
        423 => "Locked",
        424 => "Failed Dependency",
        426 => "Upgrade Required",

        500 => "Internal Server Error",
        501 => "Not Implemented",
        502 => "Bad Gateway",
        503 => "Service Unavailable",
        504 => "Gateway Timeout",
        505 => "HTTP Version Not Supported",
        507 => "Insufficient Storage",
        510 => "Not Extended"
      }

      # Provides a symbol-to-fixnum lookup for converting a symbol (like
      # :created or :not_implemented) into its corresponding HTTP status
      # code (like 200 or 501).
      SYMBOL_TO_STATUS_CODE = STATUS_CODES.inject({}) do |hash, (code, message)|
        hash[message.gsub(/ /, "").underscore.to_sym] = code
        hash
      end

      # Given a status parameter, determine whether it needs to be converted
      # to a string. If it is a fixnum, use the STATUS_CODES hash to lookup
      # the default message. If it is a symbol, use the SYMBOL_TO_STATUS_CODE
      # hash to convert it.
      def interpret_status(status)
        case status
        when Fixnum then
          STATUS_CODES[status]
        when Symbol then
          interpret_status(SYMBOL_TO_STATUS_CODE[status] ||
          "500 Unknown Status #{status.inspect}")
        else
          status.to_s
        end
      end
    end
  end
end