ldap_adapter.rb

class LDAPAdapter

    def initialize(options={})
        @config = options.select do |key, value|
            [:uid].include? key
        end

        @server = options.select do |key, value| 
            [:host, :port, :base].include? key
        end

        @conn = ldap(options)
    end

    def search(user)

        if @conn.bind
            filter = Net::LDAP::Filter.eq(@config[:uid], user)
            @conn.search(:base => @server[:base], :filter => filter).first
        else
            return nil
        end
    rescue Net::LDAP::LdapError => e
        return false
    end

    def bindable?(user, pass)
        return false if user.empty? or pass.empty?
        user = search(user)
        ldap(username: user.dn, password: pass).bind ? user : false
    rescue 
        false
    end

    private

    def ldap(options={})
        Net::LDAP.new auth(options).merge(@server)
    end

    def auth(options={})
        { auth:
            { method: :simple }.merge(options.select { |key, value|
                [:username, :password, :method].include? key
            })
        }
    end

end