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project.py
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project.py
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# Creating and Testing out our first Flask application
from flask import (
Flask,
render_template,
request, redirect,
url_for,
flash,
jsonify
)
# import CRUD Operations from Lesson 1
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from database_setup import Base, Category, Item, User
# New imports for Login Session / Google Log in
from flask import (
session as login_session,
)
import random
import string
# Imports for GConnect
# store OAuth2 parameters
from oauth2client.client import flow_from_clientsecrets
# Catch error in case we run into error during OAuth
from oauth2client.client import FlowExchangeError
# comprehenive python http2 client library
import httplib2
# convert in memory python objects to JSON
import json
# converts our returned function to a real response method sent to our client
from flask import make_response
# apache library written in python
import requests
# For our login decorator
from functools import wraps
# For our Google Login
CLIENT_ID = json.loads(open('client_secret.json', 'r')
.read())['web']['client_id']
APPLICATION_NAME = 'Item Catalog'
# Create an instance of this class with __name__ as the running argument
app = Flask(__name__)
# create Session and connect to DB
engine = create_engine('sqlite:///catalogitems.db')
Base.metadata.bind=engine
DBSession = sessionmaker(bind=engine)
session = DBSession()
""" Note: app.route('/') - is a python decorator -
when browser uses URL, the function specific to that URL gets executed
"""
# =================================================================
# ------------------------ Login / Signup -------------------------
# =================================================================
# Create a state token to prevent request
# Store it in the session for later validation
@app.route('/login')
def showLogin():
state = ''.join(random.choice(string.ascii_uppercase + string.digits)
for x in xrange(32))
login_session['state'] = state
# Show our validation in a string -
# return "The current session state is %s" % login_session['state']
return render_template('login.html', STATE=state)
# Login Decorator
# Check if our user is logged in
# If user not logged in return to log in page
def login_required(f):
@wraps(f)
def decorated_function(*args, **kwargs):
if 'username' not in login_session:
flash("Please log in or sign up to perform that action")
return redirect('/login')
return f(*args, **kwargs)
return decorated_function
# ------------------------------ Google Log in --------------------------- /
# Server side code accepting token
@app.route('/gconnect', methods=['POST'])
def gconnect():
# Validate state token
# (client sent to server matches server sent to client)
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
request.get_data()
code = request.data.decode('utf-8')
try:
# Upgrade the authorization code into a credentials object
oauth_flow = flow_from_clientsecrets('client_secret.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()
response = h.request(url, 'GET')[1]
str_response = response.decode('utf-8')
result = json.loads(str_response)
# 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_credentials = login_session.get('credentials')
stored_gplus_id = login_session.get('gplus_id')
if stored_credentials is not None and gplus_id == stored_gplus_id:
login_session['credentials'] = credentials
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['credentials'] = 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']
# When you log in via Gmail, create new user_id if does not exist in DB
user_id = getUserID(login_session['email'])
if not user_id:
user_id = createUser(login_session)
login_session['user_id'] = user_id
output = ''
output += '<h1>Welcome, '
output += login_session['username']
output += '!</h1>'
output += '<img src="'
output += login_session['picture']
output += ' " style = "width: 300px; height: 300px;' \
'border-radius: 150px;-webkit-border-radius: 150px;' \
'-moz-border-radius: 150px;"> '
flash("Welcome, You are now logged in as %s" % login_session['username'])
print "done!"
return output
# Use login_session to create a New User when signed in
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
# Pass a user.id into this method return a User object
# with the associated id number from the DB
def getUserInfo(user_id):
user = session.query(User).filter_by(id=user_id).one()
return user
# Take am email address and return a user.id if the email exists
def getUserID(email):
try:
user = session.query(User).filter_by(email=email).one()
return user.id
except:
return None
# DISCONNECT - Revoke a current user's token and reset their login_session
@app.route('/gdisconnect')
def gdisconnect():
# Only disconnect a connected user
credentials = login_session.get('credentials')
if credentials is None:
response = make_response(json.dumps('Current user not connected.'),
401)
response.headers['Content-Type'] = 'application/json'
return response
access_token = credentials.access_token
url = 'https://accounts.google.com/o/oauth2/revoke?token=%s' % access_token
h = httplib2.Http()
result = h.request(url, 'GET')[0]
if result['status'] != '200':
# For some reason token was Invalid
response = make_response(json.dumps('Failed to revoke token for user'),
400)
response.headers['Content-Type'] = 'application/json'
return response
# ---------------------------------- Facebook Log in ---------------------- /
# Log in using facebook
@app.route('/fbconnect', methods=['POST'])
def fbconnect():
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
access_token = request.data
app_id = json.loads(open('fb_client_secrets.json', 'r').read())[
'web']['app_id']
app_secret = json.loads(
open('fb_client_secrets.json', 'r').read())['web']['app_secret']
url = 'https://graph.facebook.com/oauth/access_token?' \
'grant_type=fb_exchange_token&client_id=%s&' \
'client_secret=%s&fb_exchange_token=%s' % (app_id, app_secret, access_token)
h = httplib2.Http()
result = h.request(url, 'GET')[1]
# Use token to get user info from API
userinfo_url = "https://graph.facebook.com/v2.8/me"
# strip expire tag from access token
token = result.split(',')[0].split(':')[1].replace('"', '')
url = 'https://graph.facebook.com/v2.8/me?' \
'access_token=%s&fields=name,id,email' % token
h = httplib2.Http()
result = h.request(url, 'GET')[1]
data = json.loads(result)
# sys.stdout = open('output.logs', 'w')
# print (data["name"]) # Nothing appears below
# print (data["email"]) # Nothing appears below
# print (data["id"]) # Nothing appears below
# sys.stdout = sys.__stdout__ # Reset to the standard output
# open('output.logs', 'r').read()
# return "OK"
login_session['provider'] = 'facebook'
login_session['username'] = data["name"]
login_session['email'] = data["email"]
login_session['facebook_id'] = data["id"]
""" The token must be stored in the login_session
in order to properly logout,
let's strip out the information before the equals sign in our token
"""
login_session['access_token'] = token
# Get user picture
url = 'https://graph.facebook.com/v2.8/me/picture' \
'?access_token=%s&redirect=0&height=200&width=200' % token
h = httplib2.Http()
result = h.request(url, 'GET')[1]
data = json.loads(result)
login_session['picture'] = data["data"]["url"]
# see if user exists
user_id = getUserID(login_session['email'])
if not user_id:
user_id = createUser(login_session)
login_session['user_id'] = user_id
return "Ok"
output = ''
output += '<h1>Welcome, '
output += login_session['username']
output += '!</h1>'
output += '<img src="'
output += login_session['picture']
output += ' " style = "width: 300px; height: 300px;' \
'border-radius: 150px;-webkit-border-radius: 150px;' \
'-moz-border-radius: 150px;"> '
flash("you are now logged in as %s" % login_session['username'])
print "done!"
return output
# Disconnect from Facebook
@app.route('/fbdisconnect')
def fbdisconnect():
facebook_id = login_session['facebook_id']
url = 'https://graph.facebook.com/%s/permissions' % facebook_id
h = httplib2.Http()
result = h.request(url, 'DELETE')[1]
# Global disconnect function
@app.route('/disconnect')
def disconnect():
if 'provider' in login_session:
if login_session['provider'] == 'google':
gdisconnect()
del login_session['gplus_id']
del login_session['credentials']
if login_session['provider'] == 'facebook':
fbdisconnect()
del login_session['facebook_id']
del login_session['username']
del login_session['email']
del login_session['picture']
del login_session['user_id']
del login_session['provider']
flash("You've been successfully logged out.")
return render_template('logout.html')
else:
flash("You weren't signed in.")
return render_template('logout.html')
# =================================================================
# -------------------------- Catalog ------------------------------
# =================================================================
# Show entire Catalog
@app.route('/')
@app.route('/catalog/')
def showCategory():
categories = session.query(Category).all()
users = session.query(User).all()
if 'username' not in login_session:
return render_template('publicCatalog.html',
categories=categories,
users=users)
return render_template('category.html', categories=categories)
# Create new Category
@app.route('/catalog/new/', methods=['GET', 'POST'])
@login_required
def newCategory():
if request.method == 'POST':
newCategory = Category(name=request.form['name'])
session.add(newCategory)
session.commit()
return redirect(url_for('showCategory'))
else:
return render_template('newCategory.html')
# Edit an existing Category
@app.route('/catalog/<int:category_id>/edit/', methods=['GET', 'POST'])
@login_required
def editCategory(category_id):
editedCategory = session.query(Category).filter_by(id=category_id).one()
if request.method == 'POST':
if request.form['name']:
editedCategory.name = request.form['name']
return redirect(url_for('showCategory'))
else:
return render_template('editCategory.html',
category=editedCategory)
# Delete an existing Category
@app.route('/catalog/<int:category_id>/delete/', methods=['GET', 'POST'])
@login_required
def deleteCategory(category_id):
categoryToDelete = session.query(Category).filter_by(id=category_id).one()
if request.method == 'POST':
session.delete(categoryToDelete)
session.commit()
return redirect(url_for('showCategory', category_id=category_id))
else:
return render_template('deleteCategory.html',
category=categoryToDelete)
# =================================================================
# ---------------------------- Catalog Items ----------------------
# =================================================================
# Show a Catalog Item
@app.route('/catalog/<int:category_id>/')
@app.route('/catalog/<int:category_id>/items/')
def catalogItemList(category_id):
# Add entire catalog and items to page
category = session.query(Category).filter_by(id=category_id).one()
creator = session.query(User).all()
items = session.query(Item).filter_by(category_id=category_id).all()
# Render templates in folder and pass our queries above
# as arguments for our template
if 'username' not in login_session:
return render_template('publicItems.html',
category=category,
items=items,
creator=creator)
else:
return render_template('item.html',
category=category,
items=items,
creator=creator)
# Add a new Catalog Item
@app.route('/catalog/<int:category_id>/items/new/', methods=['GET', 'POST'])
@login_required
def newItem(category_id):
# Look for POST request
if request.method == 'POST':
# extract 'name' from our form using request.form
newItem = Item(name=request.form['name'], category_id=category_id)
session.add(newItem)
session.commit()
# Our flask message
flash("New item for category created!")
return redirect(url_for('catalogItemList', category_id=category_id))
# If a POST request was not received
else:
return render_template('newItem.html', category_id=category_id)
# Edit an existing Catalog Item name
@app.route('/catalog/<int:category_id>/<int:item_id>/edit/',
methods=['GET', 'POST']
)
@login_required
def editItem(category_id, item_id):
editedItem = session.query(Item).filter_by(id=item_id).one()
if request.method == 'POST':
if request.form['name']:
editedItem.name = request.form['name']
session.add(editedItem)
session.commit()
return redirect(url_for('catalogItemList', category_id=category_id))
else:
return render_template(
'editItem.html',
category_id=category_id,
item_id=item_id,
item=editedItem)
# Edit an existing Catalog Item Description
@app.route('/catalog/<int:category_id>/<int:item_id>/editDescription/',
methods=['GET', 'POST'])
@login_required
def editItemDes(category_id, item_id):
editedItem = session.query(Item).filter_by(id=item_id).one()
if request.method == 'POST':
if request.form['description']:
editedItem.description = request.form['description']
session.add(editedItem)
session.commit()
return redirect(url_for('catalogItemList', category_id=category_id))
else:
return render_template(
'editItemDes.html',
category_id=category_id,
item_id=item_id,
item=editedItem)
# Delete an existing Catalog Item
@app.route('/catalog/<int:category_id>/<int:item_id>/delete',
methods=['GET', 'POST']
)
@login_required
def deleteItem(category_id, item_id):
itemToDelete = session.query(Item).filter_by(id=item_id).one()
if request.method == 'POST':
session.delete(itemToDelete)
session.commit()
return redirect(url_for('catalogItemList', category_id=category_id))
else:
return render_template('deleteItem.html', item=itemToDelete)
# ===========================================================================
# ---------------------------------- JSON Endpoints -------------------------
# ===========================================================================
# Show Items in Catalog Page in JSON
@app.route('/catalog/<int:category_id>/items/JSON')
def catalogItemsJSON(category_id):
category = session.query(Category).filter_by(id=category_id).one()
items = session.query(Item).filter_by(category_id=category_id).all()
# Return jsonify class and use loop to serialize all our DB entries
return jsonify(Items=[i.serialize for i in items])
# Show individual Items in the URL in JSON
@app.route('/catalog/<int:category_id>/items/<int:menu_id>/JSON')
def itemJSON(category_id, menu_id):
item = session.query(Item).filter_by(id=menu_id).one()
return jsonify(Item=item.serialize)
# Show all Catalog names in JSON
@app.route('/catalog/JSON')
def catalogJSON():
catalog = session.query(Category).all()
return jsonify(catalog=[r.serialize for r in catalog])
# if executed via python interpreter run this function
if __name__ == '__main__':
# Secret key for flask message flashing (sessions)
app.secret_key = 'super_secret_key'
# reload server when code change detected and run debug in browser
app.debug = True
# use to run local server with our application
# special config for vagrant machine by making our host publicly available
app.run(host='0.0.0.0', port=5000)