gistfile1.py

import cgi
import os

from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db
from google.appengine.ext.webapp import template

class Greeting(db.Model):
    author = db.UserProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateTimeProperty(auto_now_add=True)

class MainPage(webapp.RequestHandler):
    def get(self):
        greetings_query = Greeting.all().order('-date')            
        greetings = greetings_query.fetch(10)
        
        if users.get_current_user():
            url = users.create_logout_url(self.request.uri)
            url_linktext = 'Logout'
        else:
            url = users.create_login_url(self.request.uri)
            url_linktext = 'Login'
        
        template_values = {
            'greetings': greetings,
            'url': url,
            'url_linktext': url_linktext,
        }
        
        path = os.path.join(os.path.dirname(__file__), 'index.html')
        self.response.out.write(template.render(path, template_values))
            
class Guestbook(webapp.RequestHandler):
    def post(self):
        greeting = Greeting()
        
        if users.get_current_user():
            greeting.author = users.get_current_user()
            
        greeting.content = self.request.get('content')
        greeting.put()
        self.redirect('/')
        
application = webapp.WSGIApplication(
                                    [('/', MainPage),
                                     ('/sign', Guestbook)],
                                    debug=True)

def main():
    run_wsgi_app(application)
    
if __name__ == "__main__":
    main()