text: # -*- coding: utf-8 -*-
  
  import six
  
  from datetime import timedelta
  from functools import update_wrapper
  from flask import make_response, request, current_app
  
  
  def crossdomain(origin="*", methods=None, headers=None,
                  max_age=21600, attach_to_all=True,
                  automatic_options=True):
  	if methods is not None:
  		methods = ', '.join(sorted(x.upper() for x in methods))
  	if headers is not None and not isinstance(headers, six.string_types):
  		headers = ', '.join(x.upper() for x in headers)
  	if not isinstance(origin, six.string_types):
  		origin = ', '.join(origin.split(" "))
  	if isinstance(max_age, timedelta):
  		max_age = max_age.total_seconds()
  
  	def get_methods():
  		if methods is not None:
  			return methods
  
  		options_resp = current_app.make_default_options_response()
  		return options_resp.headers['allow']
  
  	def decorator(f):
  		def wrapped_function(*args, **kwargs):
  			if automatic_options and request.method == 'OPTIONS':
  				resp = current_app.make_default_options_response()
  			else:
  				resp = make_response(f(*args, **kwargs))
  			if not attach_to_all and request.method != 'OPTIONS':
  				return resp
  
  			h = resp.headers
  
  			h['Access-Control-Allow-Origin'] = origin
  			h['Access-Control-Allow-Methods'] = get_methods()
  			h['Access-Control-Max-Age'] = str(max_age)
  			if headers is not None:
  				h['Access-Control-Allow-Headers'] = headers
  			return resp
  
  		f.provide_automatic_options = False
  		return update_wrapper(wrapped_function, f)
  	return decorator
  