gistfile1.rb

# read password file
password_array = CSV.parse(File.open(PASSWORD_FILE_PATH, "r"))

# find user   
users = [] 
password_array.each do |e|
  if (e[0] == (params[:login]['username']).downcase) && (e[1] == (params[:login]['password']).downcase)
     users << e 
  end
end

# return user
users.first