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blog.py
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blog.py
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import os
import re
import random
import hashlib
import hmac
from string import letters
import webapp2
import jinja2
from google.appengine.ext import db
#This is the template-loading code that is creating a directory
#where we will put all of the templates
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir),
autoescape = True)
secret = 'fart'
def render_str(template, **params):
t = jinja_env.get_template(template)
return t.render(params)
def make_secure_val(val):
return '%s|%s' % (val, hmac.new(secret, val).hexdigest())
def check_secure_val(secure_val):
val = secure_val.split('|')[0]
if secure_val == make_secure_val(val):
return val
#def write keeps me from having to type self response all the time
class BlogHandler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
#render_str takes a template name and parameters to substitute into the template.
def render_str(self, template, **params):
params['user'] = self.user
return render_str(template, **params)
#render calls write and render_str to print out a template.
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
def set_secure_cookie(self, name, val):
cookie_val = make_secure_val(val)
self.response.headers.add_header(
'Set-Cookie',
'%s=%s; Path=/' % (name, cookie_val))
def read_secure_cookie(self, name):
cookie_val = self.request.cookies.get(name)
if not cookie_val:
return None
return cookie_val and check_secure_val(cookie_val)
def login(self, user):
self.set_secure_cookie('user_id', str(user.key().id()))
def logout(self):
self.response.headers.add_header('Set-Cookie', 'user_id=; Path=/')
def initialize(self, *a, **kw):
webapp2.RequestHandler.initialize(self, *a, **kw)
uid = self.read_secure_cookie('user_id')
if uid:
self.user = None
self.user = uid and User.by_id(int(uid))
def render_post(response, post):
response.out.write('<b>' + post.subject + '</b><br>')
response.out.write(post.content)
class MainPage(BlogHandler):
def get(self):
self.write('Hello, Udacity!')
##### user stuff
def make_salt(length = 5):
return ''.join(random.choice(letters) for x in xrange(length))
def make_pw_hash(name, pw, salt = None):
if not salt:
salt = make_salt()
h = hashlib.sha256(name + pw + salt).hexdigest()
return '%s,%s' % (salt, h)
def valid_pw(name, password, h):
salt = h.split(',')[0]
return h == make_pw_hash(name, password, salt)
def users_key(group = 'default'):
return db.Key.from_path('users', group)
class User(db.Model):
name = db.StringProperty(required = True)
pw_hash = db.StringProperty(required = True)
email = db.StringProperty()
@classmethod
def by_id(cls, uid):
return User.get_by_id(uid, parent = users_key())
@classmethod
def by_name(cls, name):
u = User.all().filter('name =', name).get()
return u
@classmethod
def register(cls, name, pw, email = None):
pw_hash = make_pw_hash(name, pw)
return User(parent = users_key(),
name = name,
pw_hash = pw_hash,
email = email)
@classmethod
def login(cls, name, pw):
u = cls.by_name(name)
if u and valid_pw(name, pw, u.pw_hash):
return u
##### blog stuff
#this function is for the datastore
#this defines this is the blog key
#this is going to be the value of the blog's parent
def blog_key(name = 'default'):
return db.Key.from_path('blogs', name)
#here we define the post entry / post class
#list of properties that blog has:
#subject = string (is required)
#content = text (is required)
#timestamps:
#auto_now_add parameter = automatically make this property
#the current time when you create an object, so you don't have to set it.
#auto_now function = every time you update the objects,
#it sets this property, last_mod, to be the time that we just updated an entry.
#user_id = here we are giving a user an id
class Post(db.Model):
subject = db.StringProperty(required = True)
content = db.TextProperty(required = True)
created = db.DateTimeProperty(auto_now_add = True)
last_modified = db.DateTimeProperty(auto_now = True)
user_id = db.IntegerProperty(required = True)
liked_by = db.ListProperty(int)
# user = db.ReferenceProperty(User) self.user.key()
#this function renders what the text user enters and self.content.replace('\n', '<br>')
#adds new lines/ line breaks so the text displays properly
def render(self):
self._render_text = self.content.replace('\n', '<br>')
return render_str("post.html", p = self, likes = len(self.liked_by))
#this looks at all of the posts ordered by creation time and stores them in the post object.
class BlogFront(BlogHandler):
def get(self):
#posts = db.GqlQuery("select * from Post order by created desc limit 10")
posts = Post.all().order('-created')
if posts.count() == 0:
posts = None
if not self.user:
self.user = None
self.render('front.html', posts = posts, user = self.user)
#postpage = says find the post with the ID post_id, which gets passed in from the URL
class PostPage(BlogHandler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
#if there's not a post just return 404
if not post:
self.error(404)
return
#if there is a post, return permalink.html with post equals post
self.render("permalink.html", post = post)
class EditPage(BlogHandler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not post:
self.error(404)
return
if not self.user:
self.redirect('/login')
return
if post.user_id != self.user.key().id():
self.redirect('/blog/%s' % str(post.key().id()))
return
self.render("edit.html", post = post)
def post(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not post:
self.error(404)
return
if not self.user:
self.redirect('/login')
return
if post.user_id != self.user.key().id():
self.redirect('/blog/%s' % str(post.key().id()))
return
subject = self.request.get('subject')
content = self.request.get('content')
if subject and content:
post.subject = subject
post.content = content
post.put()
self.redirect('/blog/%s' % str(post.key().id()))
else:
error = "subject and content, please!"
self.render("edit.html", post = post, error=error)
class LikePage(BlogHandler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not post:
self.error(404)
return self.redirect('/')
if not self.user:
self.redirect('/login')
return
if post.user_id == self.user.key().id() or self.user.key().id() in post.liked_by:
self.redirect('/blog/%s' % str(post.key().id()))
print "was unable to like post"
return self.redirect('/')
post.liked_by.append(self.user.key().id())
print post.liked_by
post.put()
self.redirect('/blog/%s' % str(post.key().id()))
class DeletePage(BlogHandler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not post:
self.error(404)
return
if not self.user:
self.redirect('/login')
return
if post.user_id != self.user.key().id():
self.redirect('/blog/%s' % str(post.key().id()))
return
post.delete()
self.redirect('/blog')
class NewPost(BlogHandler):
def get(self):
if self.user:
self.render("newpost.html")
else:
self.redirect("/login")
def post(self):
if not self.user:
self.redirect('/blog')
subject = self.request.get('subject')
content = self.request.get('content')
if subject and content:
p = Post(parent = blog_key(), user_id = self.user.key().id(), subject = subject, content = content)
p.put()
self.redirect('/blog/%s' % str(p.key().id()))
else:
error = "subject and content, please!"
self.render("newpost.html", subject=subject, content=content, error=error)
###### Unit 2 HW's
class Rot13(BlogHandler):
def get(self):
self.render('rot13-form.html')
def post(self):
rot13 = ''
text = self.request.get('text')
if text:
rot13 = text.encode('rot13')
self.render('rot13-form.html', text = rot13)
USER_RE = re.compile(r"^[a-zA-Z0-9_-]{3,20}$")
def valid_username(username):
return username and USER_RE.match(username)
PASS_RE = re.compile(r"^.{3,20}$")
def valid_password(password):
return password and PASS_RE.match(password)
EMAIL_RE = re.compile(r'^[\S]+@[\S]+\.[\S]+$')
def valid_email(email):
return not email or EMAIL_RE.match(email)
class Signup(BlogHandler):
def get(self):
self.render("signup-form.html")
def post(self):
have_error = False
self.username = self.request.get('username')
self.password = self.request.get('password')
self.verify = self.request.get('verify')
self.email = self.request.get('email')
params = dict(username = self.username,
email = self.email)
if not valid_username(self.username):
params['error_username'] = "That's not a valid username."
have_error = True
if not valid_password(self.password):
params['error_password'] = "That wasn't a valid password."
have_error = True
elif self.password != self.verify:
params['error_verify'] = "Your passwords didn't match."
have_error = True
if not valid_email(self.email):
params['error_email'] = "That's not a valid email."
have_error = True
if have_error:
self.render('signup-form.html', **params)
else:
self.done()
def done(self, *a, **kw):
raise NotImplementedError
class Unit2Signup(Signup):
def done(self):
self.redirect('/unit2/welcome?username=' + self.username)
class Register(Signup):
def done(self):
#make sure the user doesn't already exist
u = User.by_name(self.username)
if u:
msg = 'That user already exists.'
self.render('signup-form.html', error_username = msg)
else:
u = User.register(self.username, self.password, self.email)
u.put()
self.login(u)
self.redirect('/blog')
class Login(BlogHandler):
def get(self):
self.render('login-form.html')
def post(self):
username = self.request.get('username')
password = self.request.get('password')
u = User.login(username, password)
if u:
self.login(u)
self.redirect('/blog')
else:
msg = 'Invalid login'
self.render('login-form.html', error = msg)
class Logout(BlogHandler):
def get(self):
self.logout()
self.redirect('/blog')
class Unit3Welcome(BlogHandler):
def get(self):
if self.user:
self.render('welcome.html', username = self.user.name)
else:
self.redirect('/signup')
class Welcome(BlogHandler):
def get(self):
username = self.request.get('username')
if valid_username(username):
self.render('welcome.html', username = username)
else:
self.redirect('/unit2/signup')
#routes
#/Blog/ and then a number, 0-9+, this is a regular expression for how to describe an integer
app = webapp2.WSGIApplication([('/main', MainPage),
('/unit2/rot13', Rot13),
('/unit2/signup', Unit2Signup),
('/unit2/welcome', Welcome),
('/', BlogFront),
('/blog/?', BlogFront),
('/blog/([0-9]+)', PostPage),
('/blog/([0-9]+)/edit', EditPage),
('/blog/([0-9]+)/delete', DeletePage),
('/blog/([0-9]+)/like', LikePage),
('/blog/newpost', NewPost),
('/signup', Register),
('/login', Login),
('/logout', Logout),
('/unit3/welcome', Unit3Welcome),
],
debug=True)