oldhaven/app/controllers/user_controller.rb

require 'digest'

class UserController < ApplicationController
  @@secret_key
  def auth
    # Defining secret key dependent on hostname
    @@secret_key = request.host == 'beathaven.org' ? 'sdgwSbl3nNE4ZxafuPrp' : 's5zyjb693z6uV4rbhEyc'
    @res = {}
    
    unless params[:expire].nil? or params[:mid].nil? or params[:secret].nil? or params[:sid].nil? or params[:sig].nil?
      # Calculating hash
      hash = 'expire='+ params[:expire] +'mid='+ params[:mid] +'secret='+ params[:secret] +'sid='+ params[:sid] + @@secret_key
      hash_md5 = Digest::MD5.hexdigest(hash)
      
      if Digest::MD5.hexdigest(hash) == params[:sig]
        @res[:status] = 'hello'
        user = User.find_by_vkid(params[:mid])
        if user.nil?
          user = User.new
          user.vkid = params[:mid]
          user.save
        end
        if user.name.nil? and not params[:name].nil?
          user.name = params[:name]
          user.save
        end
        @res[:id] = user.id
        @res[:username] = user.name
      else
        @res[:status] = 'bad signature'
      end
    else
      @res[:status] = 'bad params'
    end
    
    render :json => @res
  end
end