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main.py
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main.py
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import os
import webapp2
import jinja2
from google.appengine.ext import ndb
from google.appengine.api import memcache
import json
import logging
import utils
# --- TEMPLATES ---
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
JINJA_ENVIRONMENT = jinja2.Environment(
loader=jinja2.FileSystemLoader(template_dir),
extensions=['jinja2.ext.autoescape'],
autoescape=True)
class TemplateHandler(utils.MainHandler):
def template(self, template, **params):
params['user'] = self.user # pass self.user into every template
return self.response.write(JINJA_ENVIRONMENT.get_template(template).render(**params))
def initialize(self, *a, **kw):
webapp2.RequestHandler.initialize(self, *a, **kw)
uid = self.read_secure_cookie('user_id')
if uid:
logging.error("ID FROM COOKIE: " + str(uid))
self.user = uid and User.get_by_id(int(uid), parent=user_key()) # None or User entity
if self.user:
logging.error("AUTHENTICATED USER, self.user has been set.")
elif uid:
logging.error("VALID COOKIE FOUND BUT ID NOT IN DATASTORE!")
# -- MODELS ---
class User(ndb.Model):
username = ndb.StringProperty(required=True)
pw_hash = ndb.StringProperty(required=True) # ',' delimited string of salt and hash
email = ndb.StringProperty(required=True)
created = ndb.DateTimeProperty(auto_now_add=True)
logged_in = ndb.BooleanProperty(default=True)
#verified_email = ndb.BooleanProperty(default=False) --> usergroups
#admin = ndb.BooleanProperty(default=False) --> usergroups
#dead = ndb.BooleanProperty(default=False) --> usergroups
def user_key(usergroup='default'):
return ndb.Key('UserGroups', usergroup)
class Post(ndb.Model):
author = ndb.StringProperty()
subject = ndb.StringProperty(required = True)
content = ndb.TextProperty(required = True) # TextProperty is never indexed
created = ndb.DateTimeProperty(auto_now_add = True)
last_modified = ndb.DateTimeProperty(auto_now = True)
last_modified_by = ndb.StringProperty()
slug = ndb.StringProperty()
def render_post(self): # gets called from templates to render posts.
return JINJA_ENVIRONMENT.get_template('post.html').render(p=self)
def blog_key(blog_name='default'):
return ndb.Key('Blogs', blog_name)
# --- USER HANDLERS ---
class Signup(TemplateHandler):
def get(self):
self.template('signup.html')
def post(self):
username = self.request.get('username')
password = self.request.get('password')
verify = self.request.get('verify')
email = self.request.get('email')
error = utils.validation(username, password, verify, email)
if error:
self.template('signup.html', other_error=error, username=username, email=email)
else:
if User.query(User.username==username).get():
error = "Sorry, this username already exists"
self.template('signup.html', other_error=error, username=username, email=email)
else:
h = utils.make_pw_hash(username, password)
u = User(parent=user_key(), username=username, pw_hash=h, email=email)
new_user_id = u.put().id() # put() returns the models Key, put().id() returns the entities id
self.set_secure_cookie('user_id', str(new_user_id))
logging.error("NEW USER WITH ID " + str(new_user_id) + " CREATED")
self.redirect('/user/%s' % username)
class UserHome(TemplateHandler):
def get(self, username):
if self.user and username == self.user.username:
self.template('userhome.html') # we do not need to pass in self.user because we've already passed it into every template!
else:
self.redirect('/login')
class Login(TemplateHandler):
def get(self):
if self.user:
self.redirect("/user/%s" % self.user.username)
self.template('login.html')
def post(self):
username = self.request.get('username')
password = self.request.get('password')
u = User.query(User.username == username).get()
if u and utils.valid_pw(username, password, u.pw_hash):
user_id = u.key.id()
self.set_secure_cookie('user_id', str(user_id))
self.redirect('/user/%s' % username)
else:
error = "Invalid login."
self.template('login.html', username=username, other_error=error)
class Logout(TemplateHandler):
def get(self):
self.response.headers.add_header('Set-Cookie', 'user_id=; Path=/')
self.redirect('/')
# --- BLOG HANDLERS---
class Blog(TemplateHandler):
def get(self):
posts = blog_query() # hit cache or db
self.template('blog.html', posts=posts)
class NewPost(TemplateHandler):
def get(self):
if self.user:
self.template('newpost.html')
else:
self.redirect('/login')
def post(self):
subject = self.request.get('subject')
content = self.request.get('content')
slug = subject.replace(" ", "-")
if subject and content and slug:
p = Post(parent=blog_key(), subject=subject, content=content, slug=slug)
new_post_id = p.put().id()
blog_query(update=True) # update Memcache
self.redirect('/post/%s' % slug)
else:
error = "Subject and Content please"
self.template('newpost.html', error=error, subject=subject, content=content)
class Permalink(TemplateHandler):
def get(self, slug):
post = post_query(slug)
if post:
self.template('permalink.html', post=post)
else:
self.redirect('/')
# --- MEMCACHE ---
def post_query(slug):
post_key = "POST_%s" % slug
post = memcache.get(post_key)
if post is None:
logging.error("DB HIT!")
post = Post.query(Post.slug == slug).get()
if not post:
return None
logging.error("NEW POST WITH SLUG " + slug + " ADDED TO MEMCACHE.")
memcache.add(post_key, post)
return post
def blog_query(update=False):
mc_key = 'POSTS'
posts = memcache.get(mc_key)
if posts is None or update:
logging.error("DB HIT!")
posts = Post.query(ancestor=blog_key()).order(-Post.created).fetch(5)
memcache.add(mc_key, posts)
return posts
# --- JSON ----
class BlogJSON(TemplateHandler):
def get(self):
# read out of Memcached!
pass
class PermalinkJSON(TemplateHandler):
def get(self):
# read out of Memcached!
pass
# --- ROUTING ---
application = webapp2.WSGIApplication([
('/signup', Signup),
('/user/([\S]+)', UserHome),
('/login', Login),
('/logout', Logout),
('/', Blog),
('/newpost', NewPost),
('/post/([\S]+)', Permalink),
('/.json', BlogJSON),
('/post/([\S]+)/.json', PermalinkJSON),
], debug=True)