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#!/usr/bin/env python
#
# Copyright 2009 Facebook
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import functools
import markdown
import os.path
import re
import tornado.web
import tornado.wsgi
import unicodedata
import wsgiref.handlers
from google.appengine.api import users
from google.appengine.ext import db
class Entry(db.Model):
"""A single blog entry."""
author = db.UserProperty()
title = db.StringProperty(required=True)
slug = db.StringProperty(required=True)
markdown = db.TextProperty(required=True)
html = db.TextProperty(required=True)
published = db.DateTimeProperty(auto_now_add=True)
updated = db.DateTimeProperty(auto_now=True)
def administrator(method):
"""Decorate with this method to restrict to site admins."""
@functools.wraps(method)
def wrapper(self, *args, **kwargs):
if not self.current_user:
if self.request.method == "GET":
self.redirect(self.get_login_url())
return
raise tornado.web.HTTPError(403)
elif not self.current_user.administrator:
if self.request.method == "GET":
self.redirect("/")
return
raise tornado.web.HTTPError(403)
else:
return method(self, *args, **kwargs)
return wrapper
class BaseHandler(tornado.web.RequestHandler):
"""Implements Google Accounts authentication methods."""
def get_current_user(self):
user = users.get_current_user()
if user: user.administrator = users.is_current_user_admin()
return user
def get_login_url(self):
return users.create_login_url(self.request.uri)
def render_string(self, template_name, **kwargs):
# Let the templates access the users module to generate login URLs
return tornado.web.RequestHandler.render_string(
self, template_name, users=users, **kwargs)
class HomeHandler(BaseHandler):
def get(self):
entries = db.Query(Entry).order('-published').fetch(limit=5)
if not entries:
if not self.current_user or self.current_user.administrator:
self.redirect("/compose")
return
self.render("home.html", entries=entries)
class EntryHandler(BaseHandler):
def get(self, slug):
entry = db.Query(Entry).filter("slug =", slug).get()
if not entry: raise tornado.web.HTTPError(404)
self.render("entry.html", entry=entry)
class ArchiveHandler(BaseHandler):
def get(self):
entries = db.Query(Entry).order('-published')
self.render("archive.html", entries=entries)
class FeedHandler(BaseHandler):
def get(self):
entries = db.Query(Entry).order('-published').fetch(limit=10)
self.set_header("Content-Type", "application/atom+xml")
self.render("feed.xml", entries=entries)
class ComposeHandler(BaseHandler):
@administrator
def get(self):
key = self.get_argument("key", None)
entry = Entry.get(key) if key else None
self.render("compose.html", entry=entry)
@administrator
def post(self):
key = self.get_argument("key", None)
if key:
entry = Entry.get(key)
entry.title = self.get_argument("title")
entry.markdown = self.get_argument("markdown")
entry.html = markdown.markdown(self.get_argument("markdown"))
else:
title = self.get_argument("title")
slug = unicodedata.normalize("NFKD", title).encode(
"ascii", "ignore")
slug = re.sub(r"[^\w]+", " ", slug)
slug = "-".join(slug.lower().strip().split())
if not slug: slug = "entry"
while True:
existing = db.Query(Entry).filter("slug =", slug).get()
if not existing or str(existing.key()) == key:
break
slug += "-2"
entry = Entry(
author=self.current_user,
title=title,
slug=slug,
markdown=self.get_argument("markdown"),
html=markdown.markdown(self.get_argument("markdown")),
)
entry.put()
self.redirect("/entry/" + entry.slug)
class EntryModule(tornado.web.UIModule):
def render(self, entry):
return self.render_string("modules/entry.html", entry=entry)
settings = {
"blog_title": u"Tornado Blog",
"template_path": os.path.join(os.path.dirname(__file__), "templates"),
"ui_modules": {"Entry": EntryModule},
"xsrf_cookies": True,
}
application = tornado.wsgi.WSGIApplication([
(r"/", HomeHandler),
(r"/archive", ArchiveHandler),
(r"/feed", FeedHandler),
(r"/entry/([^/]+)", EntryHandler),
(r"/compose", ComposeHandler),
], **settings)
def main():
wsgiref.handlers.CGIHandler().run(application)
if __name__ == "__main__":
main()
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