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project.py
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#!/usr/bin/env python2.7
import json
import os
import bleach
import random
import string
import requests
import httplib2
from functools import wraps
from flask import (Flask,
render_template,
make_response,
request,
redirect,
url_for,
flash,
jsonify,
session as login_session)
from sqlalchemy import create_engine, desc
from sqlalchemy.orm import sessionmaker
from db_setup import (Base, Category, Item, User, engine)
from google.oauth2 import id_token
from google.auth.transport import requests
Base.metadata.create_all(engine)
engine = create_engine(
'sqlite:///catalog.db',
connect_args={'check_same_thread': False}
)
Base.metadata.bind = engine
DBSession = sessionmaker(bind=engine)
session = DBSession()
app = Flask(__name__)
CLIENT_ID = json.loads(
open('client_secrets.json', 'r').read())['web']['client_id']
# DECORATORS
def login_required(f):
@wraps(f)
def decorated_function(*args, **kwargs):
print(login_session)
if 'username' in login_session:
return f(*args, **kwargs)
else:
flash('You are not allowed to access there')
return redirect(url_for('showLogin'))
return decorated_function
# JSON ENDPOINTS
@app.route('/catalog/JSON/')
def showCatalogJSON():
categories = session.query(Category).all()
return jsonify(Categories=[c.serialize for c in categories])
@app.route('/catalog/<string:category_name>/items/JSON')
def showItemsJSON(category_name):
category = session.query(Category).filter_by(name=category_name).first()
items = session.query(Item).filter_by(category=category)
return jsonify(Items=[i.serialize for i in items])
@app.route('/catalog/<string:category_name>/<string:item_name>/JSON')
def showItemJSON(category_name, item_name):
category = session.query(Category).filter_by(name=category_name).first()
item = session.query(Item).filter_by(name=item_name,
category=category).first()
return jsonify(Item=[item.serialize])
# APPLICATION ROUTES
# Fetch category sidebar and the last 10 items added to the database
@app.route('/')
@app.route('/catalog/')
def showCatalog():
state = ''.join(random.choice(string.ascii_uppercase + string.digits)
for x in xrange(32))
login_session['state'] = state
categories = session.query(Category).all()
latest_items = session.query(Item).order_by(desc(Item.id)).limit(10)
return render_template('main.html',
categories=categories,
latest_items=latest_items,
STATE=state)
# Fetch items of a given category as well as the categories for the sidebar
# again and pass it to the category view.
@app.route('/catalog/<string:category_name>/items/')
def showItems(category_name):
categories = session.query(Category).all()
category = session.query(Category).filter_by(name=category_name).first()
items = session.query(Item).filter_by(category=category)
return render_template('category.html',
categories=categories, category=category,
items=items)
# Fetch item information and creator information and pass it to the item view.
@app.route('/catalog/<string:category_name>/<string:item_name>/')
def showItem(category_name, item_name):
print('teste')
category = session.query(Category).filter_by(name=category_name).first()
item = session.query(Item).filter_by(name=item_name,
category=category).first()
if item:
creator = getUserInfo(item.user_id)
return render_template('item.html', item=item, creator=creator)
return render_template('item.html', item=item)
# Create an anti-forgery state token and pass it to the login view.
@app.route('/catalog/login/')
def showLogin():
state = ''.join(random.choice(string.ascii_uppercase + string.digits)
for x in xrange(32))
login_session['state'] = state
return render_template('login.html', STATE=state)
# Handle oauth requests and set up an outh flow to exchange an access token
# for credentials.
@app.route('/gconnect', methods=['POST'])
def gconnect():
if request.args.get('state') != login_session['state']:
response = make_response(json.dumps('Invalid state parameter.'), 401)
response.headers['Content-Type'] = 'application/json'
return response
token = request.data
try:
# Specify the CLIENT_ID of the app that accesses the backend:
idinfo = id_token.verify_oauth2_token(
token, requests.Request(),
CLIENT_ID)
if idinfo['iss'] not in ['accounts.google.com', 'https://accounts.google.com']:
raise ValueError('Wrong issuer.')
gplus_id = idinfo['sub']
login_session['gplus_id'] = gplus_id
login_session['username'] = idinfo['name']
login_session['picture'] = idinfo['picture']
login_session['email'] = idinfo['email']
except ValueError:
# Invalid token
pass
# Create a new user in the database if it doesn't exist already.
user_id = getUserID(login_session['email'])
if not user_id:
user_id = createUser(login_session)
login_session['user_id'] = user_id
response = make_response(
json.dumps("Successfully logged in, redirecting..."), 201)
response.headers['Content-Type'] = 'application/json'
return response
# Clean up the session
@app.route('/gdisconnect')
def gdisconnect():
email = login_session.get('email')
if email is None:
response = make_response(json.dumps('Current user not connected.'),
401)
response.headers['Content-Type'] = 'application/json'
return response
# del login_session['gplus_id']
del login_session['username']
del login_session['email']
del login_session['picture']
flash("Successfully disconnected.")
response = make_response(json.dumps("Successfully disconnected."), 200)
response.headers['Content-Type'] = 'application/json'
return response
# Insert a new item into the db.
@app.route('/catalog/<string:category_name>/new/', methods=["GET", "POST"])
@login_required
def newItem(category_name):
category = session.query(Category).filter_by(name=category_name).first()
if(request.method == 'POST'):
# Sanitize user input
name = bleach.clean(request.form['name'], tags=[], strip=True)
description = bleach.clean(request.form['description'],
tags=[], strip=True)
image = bleach.clean(request.form['image'], tags=[], strip=True)
# Very rudimentary csrf protection
if not csrf_protect():
return "CSRF detected"
item = Item(name=name, description=description, category=category,
user_id=login_session['user_id'], picture=image)
session.add(item)
session.commit()
return(redirect(url_for('showItem',
category_name=item.category.name,
item_name=item.name)))
else:
return render_template('newitem.html', category=category)
@app.route('/catalog/<string:item_name>/edit/', methods=["GET", "POST"])
# @csrf_protected
@login_required
def editItem(item_name):
# Update a given item from the db.
item = session.query(Item).filter_by(name=item_name).first()
if not isUserOwner(item):
flash("You do not own this item.")
return redirect(url_for('showCatalog'))
if(request.method == 'POST'):
# Sanitize user input
name = bleach.clean(request.form['name'], tags=[], strip=True)
description = bleach.clean(request.form['description'],
tags=[], strip=True)
image = bleach.clean(request.form['image'], tags=[], strip=True)
if not csrf_protect():
return "CSRF detected"
# If an image is attached, replace the current image with it.
category = session.query(Category).get(request.form['category'])
item.name = name
item.description = description
item.category = category
item.picture = image
session.add(item)
session.commit()
return(redirect(url_for('showItem',
category_name=item.category.name,
item_name=item.name)))
else:
categories = session.query(Category).all()
return render_template('edititem.html', item=item,
categories=categories)
@app.route('/catalog/<string:item_name>/delete/', methods=["GET", "POST"])
@login_required
def deleteItem(item_name):
# Delete a given item from the db.
item = session.query(Item).filter_by(name=item_name).first()
if not item:
flash("You do not exist this item.")
return redirect(url_for('showCatalog'))
if not isUserOwner(item):
flash("You do not own this item.")
return redirect(url_for('showCatalog'))
if(request.method == 'POST'):
if not csrf_protect():
return "CSRF detected"
category_name = item.category.name
session.delete(item)
session.commit()
return(redirect(url_for('showItems', category_name=category_name)))
else:
return render_template('deleteitem.html', item=item)
@app.route('/catalog/<string:item_name>/deleteImage/', methods=["GET", "POST"])
@login_required
def deleteItemImage(item_name):
# Delete a given item from the db.
item = session.query(Item).filter_by(name=item_name).first()
if not isUserOwner(item):
flash("You do not own this item.")
return redirect(url_for('showCatalog'))
if request.method == 'POST':
if not csrf_protect():
return "CSRF detected"
session.add(item)
session.commit()
category_name = item.category_name
return(redirect(url_for(
'showItem', category_name=category_name, item_name=item.name
)))
else:
return render_template('deleteitemimage.html', item=item)
# HELPER FUNCTIONS
def createUser(login_session):
# Add a new user to the db.
newUser = User(name=login_session['username'],
email=login_session['email'],
picture=login_session['picture'])
session.add(newUser)
session.commit()
user = session.query(User).filter_by(email=login_session['email']).first()
return user.id
def getUserID(email):
# Exchange the user email for a user id from the db.
try:
user = session.query(User).filter_by(email=email).first()
return user.id
except Exception:
return None
def getUserInfo(user_id):
# Exhange the user id for user info from the db.
user = session.query(User).filter_by(id=user_id).first()
return user
def isUserOwner(item):
owner = session.query(Item).filter_by(
user_id=login_session['user_id'],
id=item.id
).first()
if owner:
return True
return False
def generate_csrf_token():
# Generate a csrf token and store it in the session.
if 'csrf_token' not in login_session:
login_session['csrf_token'] = ''.join(random.choice(
string.ascii_uppercase +
string.digits) for x
in xrange(32))
return login_session['csrf_token']
def csrf_protect():
# Check if current csrf token is valid.
token = login_session.pop('csrf_token', None)
if not token or token != request.form.get('csrf_token'):
return False
else:
return True
if __name__ == '__main__':
app.secret_key = 'super_secret_key'
app.jinja_env.globals['csrf_token'] = generate_csrf_token
app.debug = True
app.run(host='localhost', port=5000)