project.py

from flask import Flask, request, redirect, jsonify, url_for, flash
from flask import render_template as flask_render
from sqlalchemy import create_engine, asc
from sqlalchemy.orm import sessionmaker
from database_setup import Base, Restaurant, MenuItem
from flask import session as login_session
import random
import string
from oauth2client.client import flow_from_clientsecrets
from oauth2client.client import FlowExchangeError
import httplib2
import json
from flask import make_response
import requests

app = Flask(__name__)

CLIENT_ID = json.loads(
    open('client_secrets.json', 'r').read())['web']['client_id']
APPLICATION_NAME = "Restaurant Menu Application"


# Connect to Database and create database session
engine = create_engine('sqlite:///restaurantmenu.db')
Base.metadata.bind = engine

DBSession = sessionmaker(bind=engine)
session = DBSession()

# Create anti-forgery state token


@app.route('/login')
def showLogin():
    """
    shows the google login button
    """
    state = ''.join(random.choice(string.ascii_uppercase + string.digits)
                    for x in xrange(32))
    login_session['state'] = state
    # return "The current session state is %s" % login_session['state']
    return render_template('login.html', STATE=state)


@app.route('/gconnect', methods=['POST'])
def gconnect():
    """
    this sets the login session state with google data
    """
    # 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('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']

    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 - Revoke a current user's token and reset their login_session


@app.route('/gdisconnect')
def gdisconnect():
    """
    removes google data from the current session
    """
    access_token = login_session['access_token']
    print 'In gdisconnect access token is %s', access_token
    print 'User name is: '
    print login_session['username']
    if access_token is None:
        print 'Access Token is None'
        response = make_response(
            json.dumps('Current user not connected.'), 401)
        response.headers['Content-Type'] = 'application/json'
        return response
    url = 'https://accounts.google.com/o/oauth2/revoke?token=%s' \
        '' % login_session['access_token']
    h = httplib2.Http()
    result = h.request(url, 'GET')[0]
    print 'result is '
    print result
    if result['status'] == '200':
        del login_session['access_token']
        del login_session['gplus_id']
        del login_session['username']
        del login_session['email']
        del login_session['picture']
        return redirect(url_for('showRestaurants'))

    else:

        response = make_response(
            json.dumps(
                'Failed to revoke token for given user.',
                400))
        response.headers['Content-Type'] = 'application/json'
        return response


# JSON APIs to view Restaurant Information
@app.route('/restaurant/<int:restaurant_id>/menu/JSON')
def restaurantMenuJSON(restaurant_id):
    """
    this returns the menu items in JSON format
    """
    restaurant = session.query(Restaurant).filter_by(id=restaurant_id).one()
    items = session.query(MenuItem).filter_by(
        restaurant_id=restaurant_id).all()
    return jsonify(MenuItems=[i.serialize for i in items])


@app.route('/restaurant/<int:restaurant_id>/menu/<int:menu_id>/JSON')
def menuItemJSON(restaurant_id, menu_id):
    """
    this one returns the specific menu item in JSON forman
    """
    Menu_Item = session.query(MenuItem).filter_by(id=menu_id).one()
    return jsonify(Menu_Item=Menu_Item.serialize)


@app.route('/restaurant/JSON')
def restaurantsJSON():
    """
    this on returns all the restaurants in JSON format
    """
    restaurants = session.query(Restaurant).all()
    return jsonify(restaurants=[r.serialize for r in restaurants])


def render_template(template, **params):
    """
    this is a wrapper for the flask_render template
    """
    if 'username' in login_session:
        params['username'] = login_session['username']
    return flask_render(template, **params)

# Show all restaurants


@app.route('/')
@app.route('/restaurant/')
def showRestaurants():
    """
    shows all the restaurants
    """
    restaurants = session.query(Restaurant).order_by(asc(Restaurant.name))
    return render_template('restaurants.html', restaurants=restaurants)

# Create a new restaurant


@app.route('/restaurant/new/', methods=['GET', 'POST'])
def newRestaurant():
    """
    creates new restaurants
    """
    if 'email' not in login_session:
        return redirect(url_for('showRestaurants'))
    if request.method == 'POST':
        newRestaurant = Restaurant(
            name=request.form['name'],
            user_email=login_session['email'],
            user_image=login_session['picture'],
            username=login_session['username'])
        session.add(newRestaurant)
        flash('New Restaurant %s Successfully Created' % newRestaurant.name)
        session.commit()
        return redirect(url_for('showRestaurants'))
    else:
        return render_template('newRestaurant.html')

# Edit a restaurant


@app.route('/restaurant/<int:restaurant_id>/edit/', methods=['GET', 'POST'])
def editRestaurant(restaurant_id):
    """
    allows user to edit restaurants
    """
    editedRestaurant = session.query(
        Restaurant).filter_by(id=restaurant_id).one()
    if 'email' not in login_session:
        return redirect(url_for('showRestaurants'))
    if login_session['email'] != editedRestaurant.user_email:
        return redirect(url_for('showRestaurants'))
    if request.method == 'POST':
        if request.form['name']:
            editedRestaurant.name = request.form['name']
            session.add(editedRestaurant)
            session.commit()
            flash('Restaurant Successfully Edited %s' % editedRestaurant.name)
            return redirect(url_for('showRestaurants'))
    else:
        return render_template(
            'editRestaurant.html',
            restaurant=editedRestaurant)


# Delete a restaurant
@app.route('/restaurant/<int:restaurant_id>/delete/', methods=['GET', 'POST'])
def deleteRestaurant(restaurant_id):
    """
    this is a route handler that allows you to delete restaurants
    """
    restaurantToDelete = session.query(
        Restaurant).filter_by(id=restaurant_id).one()
    if 'email' not in login_session:
        return redirect(url_for('showRestaurants'))
    if login_session['email'] != restaurantToDelete.user_email:
        return redirect(url_for('showRestaurants'))
    if request.method == 'POST':
        session.delete(restaurantToDelete)
        flash('%s Successfully Deleted' % restaurantToDelete.name)
        session.commit()
        return redirect(
            url_for(
                'showRestaurants',
                restaurant_id=restaurant_id))
    else:
        return render_template(
            'deleteRestaurant.html',
            restaurant=restaurantToDelete)

# Show a restaurant menu


@app.route('/restaurant/<int:restaurant_id>/')
@app.route('/restaurant/<int:restaurant_id>/menu/')
def showMenu(restaurant_id):
    """
    this route allows us to see the menu
    """
    try:
        restaurant = session.query(
            Restaurant).filter_by(id=restaurant_id).one()
        items = session.query(MenuItem).filter_by(
            restaurant_id=restaurant_id).all()
        return render_template(
            'menu.html',
            items=items,
            restaurant=restaurant,
            username=login_session['username'])
    except Exception as e:
        return redirect(url_for('showRestaurants'))


# Create a new menu item
@app.route(
    '/restaurant/<int:restaurant_id>/menu/new/',
    methods=[
        'GET',
        'POST'])
def newMenuItem(restaurant_id):
    """
    allows users to add a new menu to a restaurant
    """
    restaurant = session.query(Restaurant).filter_by(id=restaurant_id).one()
    if 'email' not in login_session:
        return redirect(url_for('showRestaurants'))
    if login_session['email'] != restaurant.user_email:
        return redirect(url_for('showRestaurants'))
    if request.method == 'POST':
        newItem = MenuItem(
            name=request.form['name'],
            description=request.form['description'],
            price=request.form['price'],
            course=request.form['course'],
            restaurant_id=restaurant_id)
        session.add(newItem)
        session.commit()
        flash('New Menu %s Item Successfully Created' % (newItem.name))
        return redirect(url_for('showMenu', restaurant_id=restaurant_id))
    else:
        return render_template('newmenuitem.html', restaurant_id=restaurant_id)

# Edit a menu item


@app.route(
    '/restaurant/<int:restaurant_id>/menu/<int:menu_id>/edit',
    methods=[
        'GET',
        'POST'])
def editMenuItem(restaurant_id, menu_id):
    """
    allows user to edit a menu item
    """
    editedItem = session.query(MenuItem).filter_by(id=menu_id).one()
    restaurant = session.query(Restaurant).filter_by(id=restaurant_id).one()
    if 'email' not in login_session:
        return redirect(url_for('showRestaurants'))
    if login_session['email'] != restaurant.user_email:
        return redirect(url_for('showRestaurants'))
    if request.method == 'POST':
        if request.form['name']:
            editedItem.name = request.form['name']
        if request.form['description']:
            editedItem.description = request.form['description']
        if request.form['price']:
            editedItem.price = request.form['price']
        if request.form['course']:
            editedItem.course = request.form['course']
        session.add(editedItem)
        session.commit()
        flash('Menu Item Successfully Edited')
        return redirect(url_for('showMenu', restaurant_id=restaurant_id))
    else:
        return render_template(
            'editmenuitem.html',
            restaurant_id=restaurant_id,
            menu_id=menu_id,
            item=editedItem)


# Delete a menu item
@app.route(
    '/restaurant/<int:restaurant_id>/menu/<int:menu_id>/delete',
    methods=[
        'GET',
        'POST'])
def deleteMenuItem(restaurant_id, menu_id):
    """
    allows user to delete a menu item
    """
    restaurant = session.query(Restaurant).filter_by(id=restaurant_id).one()
    itemToDelete = session.query(MenuItem).filter_by(id=menu_id).one()
    if 'email' not in login_session:
        return redirect(url_for('showRestaurants'))
    if login_session['email'] != restaurant.user_email:
        return redirect(url_for('showRestaurants'))
    if request.method == 'POST':
        session.delete(itemToDelete)
        session.commit()
        flash('Menu Item Successfully Deleted')
        return redirect(url_for('showMenu', restaurant_id=restaurant_id))
    else:
        return render_template('deleteMenuItem.html', item=itemToDelete)


if __name__ == '__main__':
    app.secret_key = 'super_secret_key'
    app.debug = True
    app.run(host='0.0.0.0', port=5000)