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main.py
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main.py
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import os
import re
import random
import hmac
import time
from user import User
from comment import Comment
from post import Post
import jinja2
import webapp2
from google.appengine.ext import db
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader=jinja2.FileSystemLoader(template_dir),
autoescape=True)
secret = 'telephony'
def render_str(template, **params):
t = jinja_env.get_template(template)
return t.render(params)
def checkUsername(username):
USER_RE = re.compile(r"^[a-zA-Z0-9_-]{3,20}$")
return username and USER_RE.match(username)
def checkPassword(password):
PASS_RE = re.compile(r"^.{3,20}$")
return password and PASS_RE.match(password)
def checkEmail(email):
E_RE = re.compile(r"^[\S]+@[\S]+.[\S]+$")
return not email or E_RE.match(email)
def make_secure_val(val):
'''
Takes a value and returns a secure_val string containing
the value and it's hash, separated by a pipe
'''
return '%s|%s' % (val, hmac.new(secret, val).hexdigest())
# this is for the cookie
def check_secure_val(secure_val):
'''
Checks to see if the secure val is correct
AKA the hash of the first half matches the second half
if so, returns the val. else return Null
'''
val = secure_val.split('|')[0]
# returns the first half the secure val
if secure_val == make_secure_val(val):
return val
def render_post(response, post):
response.out.write('<b>' + post.subject + '</b><br>')
response.out.write(post.content)
class Handler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
def render_str(self, template, **params):
t = jinja_env.get_template(template)
return t.render(params)
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
# for rendering basic templates
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)
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')
self.user = uid and User.by_id(int(uid))
# Blog functions
def blog_key(name='default'):
return db.Key.from_path('blogs', name)
class BlogFront(Handler):
def get(self):
posts = Post.all().order('-created')
self.render('front.html', posts=posts, user=self.user)
def post(self):
posts = Post.all().order('-created')
if(self.request.get('like')):
likedpost = self.request.get('like')
key = db.Key.from_path('Post', int(likedpost), parent=blog_key())
post = db.get(key)
likes = post.likes
likers = post.likers
error = ""
if self.user:
if post.author == self.user.name:
error = "The author of a post cannot like their own post"
elif self.user.name in post.likers:
post.likes -= 1
post.likers.remove(self.user.name)
post.put()
else:
post.likes = post.likes + 1
post.likers.append(self.user.name)
post.put()
else:
self.redirect("/login")
time.sleep(0.2)
self.render('front.html', posts=posts, user=self.user, error=error)
class PostPage(Handler):
'''
Renders the permalink page for each blog post
'''
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
likes = post.likes
likers = post.likers
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
if not post:
self.error(404)
return
self.render("permalink.html", post=post, user=self.user,
comments=comments)
def post(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
likes = post.likes
likers = post.likers
error = ""
if(self.user):
if(self.request.get('like') == post_id):
if post.author == self.user.name:
error = "The author of a post cannot like their own post"
elif self.user.name in post.likers:
post.likes -= 1
post.likers.remove(self.user.name)
post.put()
else:
post.likes = post.likes + 1
post.likers.append(self.user.name)
post.put()
if(self.request.get('comment')):
c = Comment(parent=blog_key(),
content=self.request.get('comment'),
post_id=int(post_id), user_id=self.user.key().id())
post.comment_count = post.comment_count + 1
post.put()
c.put()
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
time.sleep(0.2)
self.render("permalink.html", post=post, user=self.user,
error=error, comments=comments)
else:
self.redirect("/login")
class NewPost(Handler):
def get(self):
if self.user:
self.render("newpost.html", user=self.user)
else:
# if there is no self.user (aka, not logged in) then it redirects
self.redirect("/login")
def post(self):
if not self.user:
# cannot post if not logged in
self.redirect('/blog')
subject = self.request.get('subject')
content = self.request.get('content')
if (self.request.get('submit') == 'change'):
if subject and content:
p = Post(parent=blog_key(), subject=subject,
content=content, author=self.user.name,
likes=0, likers=[], comment_count=0)
p.put()
self.redirect('/blog/%s' % str(p.key().id()))
else:
error = "Each post must include a subject and content"
self.render("newpost.html", subject=subject, content=content,
error=error)
else:
self.redirect('/blog')
class EditPost(Handler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
if not self.user:
self.redirect('/login')
elif self.user.name == post.author:
self.render("newpost.html", subject=post.subject,
content=post.content)
else:
msg = "Only the post's author can edit the post"
self.render("permalink.html", post=post, user=self.user, error=msg,
comments=comments)
def post(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not self.user:
# cannot post if not logged in
self.redirect('/blog')
subject = self.request.get('subject')
content = self.request.get('content')
if (self.request.get('submit') == 'change'):
if self.user.name == post.author:
if subject and content:
post.subject = subject
post.content = content
post.put()
self.redirect('/blog/%s' % str(post.key().id()))
else:
error = "Each post must include a subject and content"
self.render("newpost.html", subject=subject,
content=content, error=error)
else:
error = "Only the post's author can edit the post."
self.render("newpost.html", subject-subject, content=content,
error=error)
else:
self.redirect('/blog/%s' % str(post.key().id()))
class DeletePost(Handler):
def get(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if not self.user:
self.redirect('/login')
elif self.user.name == post.author:
self.render("permalink.html", post=post, user=self.user,
delete=True)
else:
msg = "Only the post's author can delete the post"
self.render("permalink.html", post=post, user=self.user, error=msg)
def post(self, post_id):
key = db.Key.from_path('Post', int(post_id), parent=blog_key())
post = db.get(key)
if (self.request.get("delete")):
if self.user.name == post.author:
post.delete()
time.sleep(0.2)
self.redirect('/blog')
else:
msg = "Only the post's author can delete the post"
self.render("permalink.html", post=post, user=self.user,
error=msg)
else:
self.redirect('/blog')
class EditComment(Handler):
def get(self, post_id, comment_id):
postkey = db.Key.from_path('Post', int(post_id), parent=blog_key())
key = db.Key.from_path('Comment', int(comment_id), parent=blog_key())
post = db.get(postkey)
comment = db.get(key)
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
if not self.user:
self.redirect('/login')
elif self.user.name == comment.getUserName():
self.render("editcomment.html", content=comment.content,
user=self.user)
else:
msg = "Only the comment's author can edit a commment"
self.render("permalink.html", post=post, user=self.user,
error=msg, comments=comments)
def post(self, post_id, comment_id):
key = db.Key.from_path('Comment', int(comment_id), parent=blog_key())
comment = db.get(key)
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
if not self.user:
# cannot post if not logged in
self.redirect('/blog')
content = self.request.get('content')
if (self.request.get('submit') == 'change'):
if self.user.name == comment.getUserName():
if content:
comment.content = content
comment.put()
self.redirect('/blog/%s' % post_id)
else:
error = "Each comment must include content"
self.render("editcomment.html", content=content,
error=error)
else:
msg = "Only the comment's author can edit a commment"
self.render("permalink.html", post=post, user=self.user,
error=msg, comments=comments)
else:
self.redirect('/blog/%s' % post_id)
class DeleteComment(Handler):
def get(self, post_id, comment_id):
postkey = db.Key.from_path('Post', int(post_id), parent=blog_key())
key = db.Key.from_path('Comment', int(comment_id), parent=blog_key())
post = db.get(postkey)
comment = db.get(key)
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
if not self.user:
self.redirect('/login')
elif self.user.name == comment.getUserName():
self.render("editcomment.html", content=comment.content,
user=self.user, delete=True)
else:
msg = "Only the comment's author can delete the comment"
self.render("permalink.html", post=post, user=self.user, error=msg,
comments=comments)
def post(self, post_id, comment_id):
postkey = db.Key.from_path('Post', int(post_id), parent=blog_key())
key = db.Key.from_path('Comment', int(comment_id), parent=blog_key())
post = db.get(postkey)
comment = db.get(key)
comments = db.GqlQuery("select * from Comment where post_id = " +
post_id + " order by created desc")
if (self.request.get("delete")):
if self.user.name == comment.getUserName():
comment.delete()
post.comment_count -= 1
post.put()
time.sleep(0.2)
self.redirect('/blog/%s' % post_id)
else:
msg = "Only the comment's author can delete the comment"
self.render("permalink.html", post=post, user=self.user,
error=msg, comments=comments)
else:
self.redirect('/blog/%s' % post_id)
class MainPage(Handler):
def get(self):
self.redirect("/blog")
class SignUp(Handler):
def get(self):
self.render("signup.html")
def post(self):
have_error = False
# We are going to get all the data from the form
self.username = self.request.get("username")
self.password = self.request.get("password")
self.password2 = self.request.get("password2")
self.email = self.request.get("email")
params = dict(username=self.username, email=self.email)
# then check the data to see if correct
# if something is wrong, pass along error message
# when we re-render the signup page
if not checkUsername(self.username):
params['username_error'] = "That is not a valid username."
have_error = True
if not checkPassword(self.password):
params['password_error'] = "That is not a valid password."
have_error = True
elif self.password != self.password2:
params['password_mismatch'] = "Your passwords do not match."
have_error = True
if not checkEmail(self.email):
params['email_error'] = "That is not a valid email address."
# If everything is correct, then pass the username over to the
# hello.html page.
if have_error:
self.render("signup.html", **params)
else:
self.done()
def done(self, *a, **kw):
raise NotImplementedError
class Register(SignUp):
# extends the SignUp class
def done(self):
# make sure the user doesn't already exist
u = User.by_name(self.username)
# username comes from the SignuUp class
# checks to see if there is a User object with that name
if u:
msg = 'That user already exists.'
self.render('signup.html', username_error=msg)
else:
u = User.register(self.username, self.password, self.email)
# this creates a user object
u.put()
# and stores it in the database
self.login(u)
self.redirect('/blog')
class Login(Handler):
def get(self):
self.render('login.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:
# It would be neat to change this to say if its a wrong pw
# or if the username does not exist
msg = 'Invalid login'
self.render('login.html', error=msg)
class Logout(Handler):
def get(self):
self.logout()
self.redirect('/blog')
class Welcome(Handler):
def get(self):
username = self.request.get('username')
if checkUsername(username):
self.render('hello.html', username=username)
else:
self.redirect('/signup')
app = webapp2.WSGIApplication([('/', MainPage),
('/signup', Register),
('/hello', Welcome),
('/blog/?', BlogFront),
('/login', Login),
('/blog/newpost', NewPost),
('/blog/([0-9]+)', PostPage),
('/blog/edit/([0-9]+)', EditPost),
('/blog/delete/([0-9]+)', DeletePost),
('/blog/edit/([0-9]+)/([0-9]+)', EditComment),
('/blog/delete/([0-9]+)/([0-9]+)',
DeleteComment),
('/logout', Logout)], debug=True)