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catalog.py
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catalog.py
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from flask import (Flask,
render_template,
url_for,
jsonify,
request,
flash,
redirect,
make_response,
session as login_session)
from sqlalchemy.orm import sessionmaker
from sqlalchemy import create_engine, asc
from database_setup import Base, Category, Products, User
from functools import wraps
import random
import string
from oauth2client.client import (flow_from_clientsecrets,
FlowExchangeError)
import httplib2
import json
import requests
import urllib
app = Flask(__name__)
app.secret_key = '\xd3\x97I\rd.`\xee\xfc\xf2\xdf\xf2'
CLIENT_ID = json.loads(
open('/var/www/html/catalog/client_secrets.json', 'r').read()
)['web']['client_id']
APPLICATION_NAME = "The Catalog Application"
engine = create_engine('postgresql://grader:grader007@localhost/catalog')
Base.metadata.bind = engine
DBSession = sessionmaker(bind=engine)
session = DBSession()
# =========== OAuth and logged in user Helper Functions ==========
# Create anti-forgery state token
@app.route('/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)
@app.route('/gconnect', methods=['POST'])
def gconnect():
# Validate state token
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
# Obtain authorization code
code = request.data
try:
# Upgrade the authorization code into a credentials object
oauth_flow =
flow_from_clientsecrets('/var/www/html/catalog/client_secrets.json',
scope='')
oauth_flow.redirect_uri = 'postmessage'
credentials = oauth_flow.step2_exchange(code)
except FlowExchangeError:
response = make_response(
json.dumps('Failed to upgrade the authorization code.'), 401)
response.headers['Content-Type'] = 'application/json'
return response
# Check that the access token is valid.
access_token = credentials.access_token
url = ('https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=%s'
% access_token)
h = httplib2.Http()
result = json.loads(h.request(url, 'GET')[1])
# If there was an error in the access token info, abort.
if result.get('error') is not None:
response = make_response(json.dumps(result.get('error')), 500)
response.headers['Content-Type'] = 'application/json'
return response
# Verify that the access token is used for the intended user.
gplus_id = credentials.id_token['sub']
if result['user_id'] != gplus_id:
response = make_response(
json.dumps("Token's user ID doesn't match given user ID."), 401)
response.headers['Content-Type'] = 'application/json'
return response
# Verify that the access token is valid for this app.
if result['issued_to'] != CLIENT_ID:
response = make_response(
json.dumps("Token's client ID does not match app's."), 401)
print "Token's client ID does not match app's."
response.headers['Content-Type'] = 'application/json'
return response
stored_access_token = login_session.get('access_token')
stored_gplus_id = login_session.get('gplus_id')
if stored_access_token is not None and gplus_id == stored_gplus_id:
response = make_response(
json.dumps('Current user is already connected.'), 200)
response.headers['Content-Type'] = 'application/json'
return response
# Store the access token in the session for later use.
login_session['access_token'] = credentials.access_token
login_session['gplus_id'] = gplus_id
# Get user info
userinfo_url = "https://www.googleapis.com/oauth2/v1/userinfo"
params = {'access_token': credentials.access_token, 'alt': 'json'}
answer = requests.get(userinfo_url, params=params)
data = answer.json()
login_session['username'] = data['name']
login_session['picture'] = data['picture']
login_session['email'] = data['email']
# See if a user exists, if it doesn't make a new one
login_session['id'] = getUserID(login_session['email'])
if login_session['id'] is None:
login_session['id'] = createUser(login_session)
output = ''
output += '<h1>Welcome, '
output += login_session['username']
output += '!</h1>'
output += '<center><img src="'
output += login_session['picture']
output += ' " style = "width: 100px; height: 100px;border-radius: 50px;'
output += 'margin:0px auto"> </center>'
flash("you are now logged in as %s" % login_session['username'])
print "done!"
return output
# ===== User Helper Functions ====
def createUser(login_session):
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']).one()
return user.id
def getUserInfo(user_id):
user = session.query(User).filter_by(id=user_id).one()
return user
def getUserID(email):
try:
user = session.query(User).filter_by(email=email).one()
return user.id
except Exception:
return None
def login_required(f):
@wraps(f)
def decorated_function(*args, **kwargs):
if 'username' in login_session:
return f(*args, **kwargs)
else:
flash("You are not allowed to access there")
return redirect('/login')
return decorated_function
# ===== End of User Helper Functions ====
# DISCONNECT - Revoke a current user's token and reset their login_session
@app.route('/gdisconnect')
def gdisconnect():
# Only disconnect a connected user.
access_token = login_session.get('access_token')
if access_token is None:
response = make_response(
json.dumps('Current user not connected.'), 401)
response.headers['Content-Type'] = 'application/json'
return response
http = httplib2.Http()
body = {'token': access_token}
result = http.request(
"https://accounts.google.com/o/oauth2/revoke",
method="POST",
headers={'Content-type': 'application/x-www-form-urlencoded'},
body=urllib.urlencode(body))[0]
if result['status'] == '200':
# Reset the user's sesson.
del login_session['access_token']
del login_session['gplus_id']
del login_session['username']
del login_session['email']
del login_session['picture']
flash('You have successfully logged out')
response = make_response(json.dumps({'status': 'Disconnected'}), 200)
response.headers['Content-Type'] = 'application/json'
return response
else:
# For whatever reason, the given token was invalid.
response = make_response(
json.dumps(result, 400))
response.headers['Content-Type'] = 'application/json'
return response
# =========== End of OAuth and logged in user Helper Functions ==========
# =========== Routing Handler Functions ==========
# prevent page caching in browser for all pages
@app.after_request
def add_header(r):
r.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
r.headers["Pragma"] = "no-cache"
r.headers["Expires"] = "0"
r.headers['Cache-Control'] = 'public, max-age=0, no-store, must-revalidate'
# Headers to force browser read only from server even on an event where
# user press the back and forward buttons.
return r
# Catches all 404 errors and send user to friendly 404 page.
@app.errorhandler(404)
def not_found(e):
categories = session.query(Category).all()
return render_template("404.html", categories=categories,
user=login_session)
# routes defalut site root [localhost:5000] to app home [/catalog/]
@app.route('/')
def routeToHome():
return redirect('/catalog/')
# =========== End of Routing Handler Functions =========
# ================ Application Home Page ===============
@app.route('/catalog/')
def categories():
# fetches all categroy to use in categrory list menu
categories = session.query(Category).all()
# joining using ForeignKey relationship to get parent category
# reverse ordering by id to get the last 10 product entries
products = session.query(Products).join(Category).order_by(
"id").limit(10)
return render_template('home.html', categories=categories,
products=products, user=login_session)
# ============== End of Application Home Page ===========
# =============== Category Handler Functions ============
# Retrive all products in a category
@app.route('/catalog/<string:category_name>/<int:category_id>/view/')
def categoryView(category_name, category_id):
category = session.query(Category).filter_by(id=category_id).first()
categories = session.query(Category).all()
products = session.query(Products).filter_by(category_id=category_id).all()
return render_template('category.html', category=category,
products=products, categories=categories,
user=login_session)
# Add new categroy
@app.route('/catalog/category/new/', methods=['GET', 'POST'])
@login_required
def newCategory():
if request.method == 'POST': # POST creates the category
categoryName = request.form.get('txtCategory')
newCategory = Category(name=categoryName, user_id=login_session['id'])
session.add(newCategory)
session.commit()
flash('Category "'+newCategory.name+'" added to catalog.')
categories = session.query(Category).all()
thisCategory = session.query(Category).filter_by(
id=newCategory.id).first()
returnURL = '''/catalog/{0}/{1}/view'''
return redirect(returnURL.format(thisCategory.name,
thisCategory.id))
# Formats URL and redirects to newly created categroy page
else:
# GET displays the UI page to create the categoryEnd of Category
categories = session.query(Category).all()
return render_template('_add-category.html', categories=categories)
# Edit category
@app.route('/catalog/<string:category_name>/'
+ '<int:category_id>/edit/', methods=['GET', 'POST'])
@login_required
def categoryEdit(category_name, category_id):
if request.method == 'POST': # POST updates the category
myCategoryQuery = session.query(Category).filter_by(
id=request.form.get('hidCategoryID'),
user_id=login_session['id']).first()
if myCategoryQuery != []:
myCategoryQuery.name = request.form.get('txtName')
session.add(myCategoryQuery)
session.commit()
flash('Category updated successfully')
categories = session.query(Category).all()
returnURL = '''/catalog/{0}/{1}/edit'''
return redirect(returnURL.format(myCategoryQuery.name,
myCategoryQuery.id))
# Formats URL and redirects to the updated categroy page
else: # GET displays the edit page
categories = session.query(Category).all()
category = session.query(Category).filter_by(
id=category_id,
user_id=login_session['id']
).first()
# unauthorised access of any kind [url manipulation, xss attacks]
# will be redirected to 404 handler
if category is not None:
return render_template('edit-category.html', category=category,
categories=categories, user=login_session)
else:
return redirect('404')
# Delete Category
@app.route('/catalog/<string:category_name>/'
+ '<int:category_id>/delete/', methods=['GET', 'POST'])
@login_required
def categoryDelete(category_name, category_id):
if request.method == 'POST': # POST deletes the category
categoryToDelete = session.query(Category).filter_by(
id=request.form.get('hidCategoryID'),
user_id=login_session['id']
).first()
if categoryToDelete is not None:
deletedCategory = categoryToDelete.name
session.delete(categoryToDelete)
# delete all products in the category
productsToDelete = session.query(Products).filter_by(
category_id=request.form.get('hidCategoryID')).delete()
session.commit()
flash('Category "'+deletedCategory+'" deleted from catalog.')
categories = session.query(Category).all()
return render_template('delete-category.html',
category=category_name,
categories=categories, user=login_session)
else:
return redirect('404')
else:
# GET displays the UI page to confirm delete
categories = session.query(Category).all()
category = session.query(Category).filter_by(
id=category_id,
user_id=login_session['id']
).first()
# unauthorised access of any kind [url manipulation, xss attacks]
# will be redirected to 404 handler
if category is not None:
return render_template('delete-category.html', category=category,
categories=categories, user=login_session)
else:
return redirect('404')
# =============== End of Category Handler Functions =============
# =================== Product Handler Functions =================
# Retrive product details
@app.route('/catalog/<string:category_name>/<string:product_name>/'
+ '<int:product_id>/view/')
def productView(category_name, product_name, product_id):
categories = session.query(Category).all()
product = session.query(Products).filter_by(id=product_id).first()
if product is not None: # at least one matching product
return render_template('product.html', category=category_name,
product=product, categories=categories,
user=login_session)
else: # worst case - if no matching product redirect to 404 page
return redirect('404')
# Add new product
@app.route('/catalog/products/new/', methods=['GET', 'POST'])
@login_required
def newProduct():
if request.method == 'POST': # POST creates a new product
productName = request.form.get('txtName')
category = request.form.get('selCategory')
price = request.form.get('txtPrice')
description = request.form.get('txtDescription')
checkUserCategory = session.query(Category).filter_by(
id=category, user_id=login_session['id']
).first()
if checkUserCategory is not None:
newProduct = Products(name=productName, price=price,
description=description,
category_id=category,
user_id=login_session['id'])
session.add(newProduct)
session.commit()
flash('Product "'+newProduct.name+'" added to catalog.')
categories = session.query(Category).all()
product = session.query(Products).filter_by(
id=newProduct.id).join(Category).first()
returnURL = '''/catalog/{0}/{1}/{2}/view'''
return redirect(returnURL.format(product.category.name,
product.name, product.id))
# Formats URL and redirects to newly created product page
else:
# unauthorised access of any kind [url manipulation, xss attacks]
# will be redirected to 404 handler """
return redirect('404')
else:
# GET displays the UI page to create new product
categories = session.query(Category).filter_by(
user_id=login_session['id']).all()
return render_template('_add-product.html', categories=categories)
# Edit product
@app.route('/catalog/<string:category_name>/<string:product_name>/'
+ '<int:product_id>/edit/', methods=['GET', 'POST'])
@login_required
def productEdit(category_name, product_name, product_id):
if request.method == 'POST': # POST updates the product
myProductQuery = session.query(Products).filter_by(
id=request.form.get('hidProductID'),
user_id=login_session['id']
).first()
checkUserCategory = session.query(Category).filter_by(
id=request.form.get('selCategory'),
user_id=login_session['id']
).first()
# checks if the product and categroy belongs to the user
if myProductQuery is not None and checkUserCategory is not None:
myProductQuery.name = request.form.get('txtName')
myProductQuery.category_id = request.form.get('selCategory')
myProductQuery.price = request.form.get('txtPrice')
myProductQuery.description = request.form.get('txtDescription')
session.add(myProductQuery)
session.commit()
flash('Product updated successfully')
categories = session.query(Category).all()
product = session.query(Products).filter_by(
id=product_id).join(Category).first()
returnURL = '''/catalog/{0}/{1}/{2}/edit'''
return redirect(returnURL.format(product.category.name,
product.name, product.id))
# Formats URL and redirects to edit page with changes updated
# user can continue editing if needed
else:
return redirect('404')
else:
# GET displays the UI page to update the product
categories = session.query(Category).all()
product = session.query(Products).filter_by(id=product_id,
user_id=login_session['id']
).first()
# unauthorised access of any kind [url manipulation, xss attacks]
# will be redirected to 404 handler """
if product is not None:
return render_template('edit-product.html', category=category_name,
product=product, categories=categories,
user=login_session)
else:
return redirect('404')
@app.route('/catalog/<string:category_name>/<string:product_name>/'
+ '<int:product_id>/delete/', methods=['GET', 'POST'])
@login_required
def productDelete(category_name, product_name, product_id):
if request.method == 'POST': # POST deletes the category
myProductQuery = session.query(Products).filter_by(
id=request.form.get('hidProductID'),
user_id=login_session['id']).first()
if myProductQuery is not None:
productToDelete = myProductQuery.name
session.delete(myProductQuery)
session.commit()
flash('Product "'+productToDelete+'" deleted from catalog.')
categories = session.query(Category).all()
return render_template('delete-product.html',
category=category_name,
product=request.form.get('txtName'),
categories=categories, user=login_session)
else:
return redirect('404')
else: # GET displays the UI page to confirm delete
categories = session.query(Category).all()
product = session.query(Products).filter_by(id=product_id,
user_id=login_session['id']
).first()
# unauthorised access of any kind [url manipulation, xss attacks]
# will be redirected to 404 handler """
if product is not None:
return render_template('delete-product.html',
category=category_name, product=product,
categories=categories, user=login_session)
else:
return redirect('404')
# =================== End of Product Handler Functions =================
# ==================== JSON EndPoint Handler Functions =================
# JSON endpoint to retrive all categrories
@app.route('/catalog/categories/JSON')
def catgoriesJSON():
category = session.query(Category).all()
return jsonify(categories=[i.serialize for i in category])
# JSON endpoint to retrive all products in a category
@app.route('/catalog/category/<int:category_id>/JSON')
def categoryViewEndpoint(category_id):
category = session.query(Category).filter_by(id=category_id).first()
products = session.query(Products).filter_by(category_id=category_id).all()
if category is not None:
return jsonify(category_products=[i.serialize for i in products])
else:
error = {"error": "category not found"}
return jsonify(error)
# JSON endpoint to retrive product details
@app.route('/catalog/product/<int:product_id>/JSON')
def productViewJSON(product_id):
categories = session.query(Category).all()
product = session.query(Products).filter_by(id=product_id).first()
if product is not None: # at least one matching product
return jsonify(product=product.serialize)
else:
error = {"error": "no products found"}
return jsonify(error)
# =================== End of JSON EndPoint Handler Functions =================
if __name__ == '__main__':
app.debug = True
app.run()