"""
Demo of URL handling.

From boodebr.appspot.com. May be freely used and modified for any purpose.
"""
from wsgiref.util import guess_scheme, request_uri, application_uri, \
		shift_path_info
from cgi import parse_qs

def url_demo(environ, start_response):
	path = environ['PATH_INFO']
	if path == '/urldemo/source':
		status = '200 OK'
		response_headers = [('Content-type','text/plain')]
		start_response(status, response_headers)
		return [open(__file__).read()]

	status = '200 OK'
	response_headers = [('Content-type','text/plain')]
	start_response(status, response_headers)
	
	h = ''
	
	h += 'PATH_INFO: %s\n' % environ['PATH_INFO']
	h += 'QUERY_STRING: %s\n' % environ['QUERY_STRING']
	p = parse_qs(environ['QUERY_STRING'])
	h += 'cgi.parse_qs() yields: %s\n\n' % str(p)
	
	h += 'wsgiref.util.guess_scheme(environ): %s\n' % guess_scheme(environ)
	h += 'wsgiref.util.request_uri(environ): %s\n' % request_uri(environ)
	h += 'wsgiref.util.application_uri(environ): %s\n\n' % application_uri(environ)
	
	h += 'Splitting PATH_INFO into parts with wsgiref.util.shift_path_info(environ):\n'
	name = shift_path_info(environ)
	while name is not None:
		h += '    name: %s\n' % name
		name = shift_path_info(environ)
		
	return [h]
	
# does not know nor care that it is running under AppEngine!
from wsgiref.handlers import CGIHandler
CGIHandler().run(url_demo)