Mini Shell

# frozen_string_literal: true

# Released under the MIT License.
# Copyright, 2022-2023, by Samuel Williams.

require 'zlib'

require 'rack/constants'
require 'rack/request'
require 'rack/response'

module Rackup
  # Paste has a Pony, Rack has a Lobster!
  class Lobster
    include Rack

    LobsterString = Zlib::Inflate.inflate("eJx9kEEOwyAMBO99xd7MAcytUhPlJyj2
    P6jy9i4k9EQyGAnBarEXeCBqSkntNXsi/ZCvC48zGQoZKikGrFMZvgS5ZHd+aGWVuWwhVF0
    t1drVmiR42HcWNz5w3QanT+2gIvTVCiE1lm1Y0eU4JGmIIbaKwextKn8rvW+p5PIwFl8ZWJ
    I8jyiTlhTcYXkekJAzTyYN6E08A+dk8voBkAVTJQ==".delete("\n ").unpack("m*")[0])

    LambdaLobster = lambda { |env|
      if env[QUERY_STRING].include?("flip")
        lobster = LobsterString.split("\n").
          map { |line| line.ljust(42).reverse }.
          join("\n")
        href = "?"
      else
        lobster = LobsterString
        href = "?flip"
      end

      content = ["<title>Lobstericious!</title>",
                 "<pre>", lobster, "</pre>",
                 "<a href='#{href}'>flip!</a>"]
      length = content.inject(0) { |a, e| a + e.size }.to_s
      [200, { CONTENT_TYPE => "text/html", CONTENT_LENGTH => length }, content]
    }

    def call(env)
      req = Request.new(env)
      if req.GET["flip"] == "left"
        lobster = LobsterString.split("\n").map do |line|
          line.ljust(42).reverse.
            gsub('\\', 'TEMP').
            gsub('/', '\\').
            gsub('TEMP', '/').
            gsub('{', '}').
            gsub('(', ')')
        end.join("\n")
        href = "?flip=right"
      elsif req.GET["flip"] == "crash"
        raise "Lobster crashed"
      else
        lobster = LobsterString
        href = "?flip=left"
      end

      res = Response.new
      res.write "<title>Lobstericious!</title>"
      res.write "<pre>"
      res.write lobster
      res.write "</pre>"
      res.write "<p><a href='#{href}'>flip!</a></p>"
      res.write "<p><a href='?flip=crash'>crash!</a></p>"
      res.finish
    end

  end
end

if $0 == __FILE__
  # :nocov:
  require_relative 'server'
  require_relative 'show_exceptions'
  require_relative 'lint'
  Rackup::Server.start(
    app: Rack::ShowExceptions.new(Rack::Lint.new(Rackup::Lobster.new)), Port: 9292
  )
  # :nocov:
end