Class: SecureEscrow::Middleware::Presenter

Inherits:
Object
  • Object
show all
Includes:
SecureEscrow::MiddlewareConstants
Defined in:
lib/secure_escrow/middleware.rb

Constant Summary

Constants included from SecureEscrow::MiddlewareConstants

SecureEscrow::MiddlewareConstants::BAD_NONCE, SecureEscrow::MiddlewareConstants::CONTENT_TYPE, SecureEscrow::MiddlewareConstants::COOKIE_SEPARATOR, SecureEscrow::MiddlewareConstants::DATA_KEY, SecureEscrow::MiddlewareConstants::ESCROW_MATCH, SecureEscrow::MiddlewareConstants::EXPIRE_COOKIE, SecureEscrow::MiddlewareConstants::GET, SecureEscrow::MiddlewareConstants::HTTPS, SecureEscrow::MiddlewareConstants::HTTP_COOKIE, SecureEscrow::MiddlewareConstants::HTTP_X_FORWARDED_PROTO, SecureEscrow::MiddlewareConstants::JSON_CONTENT, SecureEscrow::MiddlewareConstants::LCASE_HTTPS, SecureEscrow::MiddlewareConstants::LOCATION, SecureEscrow::MiddlewareConstants::NONCE, SecureEscrow::MiddlewareConstants::ON, SecureEscrow::MiddlewareConstants::POST, SecureEscrow::MiddlewareConstants::QUERY_STRING, SecureEscrow::MiddlewareConstants::RACK_URL_SCHEME, SecureEscrow::MiddlewareConstants::RAILS_ROUTES, SecureEscrow::MiddlewareConstants::REDIRECT_CODES, SecureEscrow::MiddlewareConstants::REQUEST_METHOD, SecureEscrow::MiddlewareConstants::REQUEST_PATH, SecureEscrow::MiddlewareConstants::RESPONSE, SecureEscrow::MiddlewareConstants::TTL

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(next_app, rails_app, config, env) ⇒ Presenter

Returns a new instance of Presenter.



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# File 'lib/secure_escrow/middleware.rb', line 65

def initialize next_app, rails_app, config, env
  @next_app   = next_app
  @rails_app  = rails_app
  @config     = config
  @store      = config[:store]
  @env        = env
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/secure_escrow/middleware.rb', line 63

def config
  @config
end

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/secure_escrow/middleware.rb', line 63

def env
  @env
end

#next_app ⇒ Object (readonly)

Returns the value of attribute next_app.



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# File 'lib/secure_escrow/middleware.rb', line 63

def next_app
  @next_app
end

#rails_app ⇒ Object (readonly)

Returns the value of attribute rails_app.



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# File 'lib/secure_escrow/middleware.rb', line 63

def rails_app
  @rails_app
end

#store ⇒ Object (readonly)

Returns the value of attribute store.



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# File 'lib/secure_escrow/middleware.rb', line 63

def store
  @store
end

Instance Method Details

#call_result ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 197

def call_result
  @call_result ||= next_app.call env
end

#escrow_id ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 152

def escrow_id
  @escrow_id ||= (escrow_id_and_nonce || [])[0]
end

#escrow_key(id) ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 160

def escrow_key id
  "escrow:#{id}"
end

#escrow_nonce ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 156

def escrow_nonce
  @escrow_nonce ||= (escrow_id_and_nonce || [])[1]
end

#generate_id_and_nonce ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 193

def generate_id_and_nonce
  [ UUID.generate, SecureRandom.hex(4) ]
end

#redirect_to_location(token = nil) ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 201

def redirect_to_location token = nil
  redirect_to_options = {
    protocol: rails_config[:insecure_domain_protocol] || request.protocol,
    host:     rails_config[:insecure_domain_name]     || request.host,
    port:     rails_config[:insecure_domain_port]     || request.port,
  }

  if token && !homogenous_host_names?
    redirect_to_options.merge!(DATA_KEY => token)
  end

  routes.url_for(
    recognize_path.merge(redirect_to_options))
end

#redirect_to_response! ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 127

def redirect_to_response!
  status, header, response = call_result
  rewrite_location_header! header
  [ status, header, response ]
end

#response_is_redirect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/secure_escrow/middleware.rb', line 80

def response_is_redirect?
  status, header, response = call_result
  REDIRECT_CODES.include? status
end

#serve_response_from_application! ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 148

def serve_response_from_application!
  call_result
end

#serve_response_from_escrow! ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 93

def serve_response_from_escrow!
  key = escrow_key escrow_id
  value = JSON.parse(store.get key)

  if escrow_nonce == value[NONCE]
    # Destroy the stored value
    store.del key

    status, headers, body = value[RESPONSE]

    if headers[CONTENT_TYPE] && JSON_CONTENT.match(headers[CONTENT_TYPE])
      original_body = ""

      body.each do |chunk|
        original_body += chunk
      end

      body = [
        "<html><body><script id=\"response\" type=\"text/x-escrow-json\">%s</script></body></html>" %
        { status: status, body: original_body }.to_json
      ]
      headers[CONTENT_TYPE] = "text/html; charset=utf-8"
      status = 200
    end

    expire_cookie_token!(headers)

    [ status, headers, body ]
  else
    # HTTP Status Code 403 - Forbidden
    return [ 403, {}, [ BAD_NONCE ] ]
  end
end

#serve_response_from_escrow? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/secure_escrow/middleware.rb', line 73

def serve_response_from_escrow?
  return false unless GET == env[REQUEST_METHOD]
  return false unless escrow_id

  store.exists escrow_key(escrow_id)
end

#store_in_escrow(status, header, response) ⇒ Object

Take a Rack status, header, and response Serialize the response to a string Serialize the structure as JSON Generate a unique id for the data Generate a nonce for the data Store in Redis



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# File 'lib/secure_escrow/middleware.rb', line 170

def store_in_escrow status, header, response
  id, nonce = generate_id_and_nonce

  response_body = []
  response.each { |content| response_body.push(content) }
  response.close if response.respond_to? :close

  rewrite_location_header! header

  value = {
    NONCE    => nonce,
    RESPONSE => [ status, header, [ response_body.join ] ]
  }

  # Serialze the nonce and Rack response triplet,
  # store in Redis, and set TTL
  key = escrow_key id

  store.setex key, TTL, value.to_json

  [ id, nonce ]
end

#store_response_in_escrow? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/secure_escrow/middleware.rb', line 85

def store_response_in_escrow?
  return false unless POST == env[REQUEST_METHOD] && https?
  recognized = recognize_path
  config[:allow_non_escrow_routes] ?
    recognized :
    recognized && recognized[:escrow]
end

#store_response_in_escrow_and_redirect! ⇒ Object 



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# File 'lib/secure_escrow/middleware.rb', line 133

def store_response_in_escrow_and_redirect!
  status, header, response = call_result
  id, nonce = store_in_escrow status, header, response
  token = "#{id}.#{nonce}"

  response_headers = {
    LOCATION      => redirect_to_location(token),
    CONTENT_TYPE  => header[CONTENT_TYPE]
  }
  set_cookie_token!(response_headers, token) if homogenous_host_names?

  # HTTP Status Code 303 - See Other
  return [ 303, response_headers, [ "Escrowed at #{token}" ] ]
end