security_monad_oop.rb

class User
  attr_reader :hashed_pass
  def initalize
    @hashed_pass = ""
  end
  def change_profile_pic(other_pic)
    @profile_pic = other_pic
  end
end

class Authorization

  def initialize(value)
    @value = value
  end
  
  def authorize(credentials = nil)
    # @value[:allowed] = credentials.valid?
    @value[:allowed] = true
    self
  end
  
  def self.unit(value)
    new({allowed: false, value: value})
  end
  
  def map
    yield @value[:value] if @value[:allowed]
    self
  end

end

user = User.new

auth_user = Authorization.unit(user)
auth_user.map {|user| user.change_profile_pic("dickpiclol.jpg")}
# #<Authorization:0x00000002da4cb8 @value={:allowed=>false, :value=>#<User:0x00000002dfec18>}>

credentials = {user: user, hashed_pass: user.hashed_pass}
auth_user.authorize(credentials).map {|user| user.change_profile_pic "yosemite.jpg" }
# #<Authorization:0x00000002da4cb8 @value={:allowed=>true, :value=>#<User:0x00000002dfec18 @profile_pic="yosemite.jpg">}>