Class: Merb::Authentication::Strategies::CAS

Inherits:
Merb::Authentication::Strategy
  • Object
show all
Includes:
CASClient
Defined in:
lib/casclient/frameworks/merb/strategy.rb

Instance Method Summary collapse

Instance Method Details

#config ⇒ Object 



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# File 'lib/casclient/frameworks/merb/strategy.rb', line 99

def config
  ::Merb::Plugins.config[:"rubycas-client"]
end

#log ⇒ Object 



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# File 'lib/casclient/frameworks/merb/strategy.rb', line 103

def log
  ::Merb.logger
end

#read_ticket ⇒ Object 



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# File 'lib/casclient/frameworks/merb/strategy.rb', line 72

def read_ticket
  ticket = request.params[:ticket]

  return nil unless ticket

  log.debug("Request contains ticket #{ticket.inspect}.")

  if ticket =~ /^PT-/
    ProxyTicket.new(ticket, service_url, request.params[:renew])
  else
    ServiceTicket.new(ticket, service_url, request.params[:renew])
  end
end

#run! ⇒ Object 



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# File 'lib/casclient/frameworks/merb/strategy.rb', line 14

def run!
  @client ||= Client.new(config)

  service_ticket = read_ticket

   = @client.(service_url)

  last_service_ticket = session[:cas_last_valid_ticket]
  if (service_ticket && last_service_ticket && 
      last_service_ticket.ticket == service_ticket.ticket && 
      last_service_ticket.service == service_ticket.service)

    # warn() rather than info() because we really shouldn't be re-validating the same ticket. 
    # The only time when this is acceptable is if the user manually does a refresh and the ticket
    # happens to be in the URL.
    log.warn("Reusing previously validated ticket since the new ticket and service are the same.")
    service_ticket = last_service_ticket
  elsif last_service_ticket &&
    !config[:authenticate_on_every_request] && 
    session[@client.username_session_key]
    # Re-use the previous ticket if the user already has a local CAS session (i.e. if they were already
    # previously authenticated for this service). This is to prevent redirection to the CAS server on every
    # request.
    # This behaviour can be disabled (so that every request is routed through the CAS server) by setting
    # the :authenticate_on_every_request config option to false. 
    log.debug "Existing local CAS session detected for #{session[@client.username_session_key].inspect}. "+
            "Previous ticket #{last_service_ticket.ticket.inspect} will be re-used."
            service_ticket = last_service_ticket
  end

  if service_ticket
    @client.validate_service_ticket(service_ticket) unless service_ticket.has_been_validated?
    validation_response = service_ticket.response

    if service_ticket.is_valid?
      log.info("Ticket #{service_ticket.inspect} for service #{service_ticket.service.inspect} " + 
              "belonging to user #{validation_response.user.inspect} is VALID.")

      session[@client.username_session_key] = validation_response.user
      session[@client.extra_attributes_session_key] = validation_response.extra_attributes

      # Store the ticket in the session to avoid re-validating the same service
      # ticket with the CAS server.
      session[:cas_last_valid_ticket] = service_ticket
      return true
    else  
      log.warn("Ticket #{service_ticket.ticket.inspect} failed validation -- " + 
              "#{validation_response.failure_code}: #{validation_response.failure_message}")
      redirect!()
      return false
    end
  else
    log.warn("No ticket -- redirecting to #{}")
    redirect!()
    return false
  end
end

#service_url ⇒ Object 



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# File 'lib/casclient/frameworks/merb/strategy.rb', line 86

def service_url
  if config[:service_url]
    log.debug("Using explicitly set service url: #{config[:service_url]}")
    return config[:service_url]
  end

  params = request.params.dup
  params.delete(:ticket)
  service_url = "#{request.protocol}://#{request.host}" + request.path
  log.debug("Guessed service url: #{service_url.inspect}")
  return service_url
end