application.py

#!/usr/bin/env python
# import modules
# This modules contains all the routes for the functioning
# of the application.
from flask import Flask, render_template
from flask import (Flask,
                   render_template,
                   request,
                   redirect,
                   jsonify)
from functools import wraps


from sqlalchemy import create_engine, asc
from sqlalchemy.orm import sessionmaker
from database_setup import (Base,
                            Category,
                            CategoryItem,
                            User)

# new imports for anti-forgery token
from flask import session as login_session
import random
import string
from jinja2 import Template

# imports for this step

from oauth2client import client
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 = "Fluffys App"

engine = create_engine('sqlite:///catalog.db')
Base.metadata.bind = engine

DBSession = sessionmaker(bind=engine)
session = DBSession()

# Create anti-forgery state token

@app.route('/login')
def showLogin():
        """Route to the login page and create anti-forgery state token."""

    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)

# Connect to the Google Sign-in oAuth method.

@app.route('/gconnect', methods=['POST'])
def gconnect():

    '''route to connect google sign-in oauth authorization, in this function
    it will validate the token and obtain authorization code then it
    upgrades the code into a credentials object'''

    # 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


# User Helper Functions
''' Helper functions is used to  make your programs easier to read by giving
 descriptive names to computations. It also let us reuse of computations,
 just as with functions in general.'''

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:
        return None


# DISCONNECT

@app.route('/gdisconnect')
def gdisconnect():
''' It will validate the acces token in login session if both will match
then it allow us to log out and the details of users will be also delted
from the databse '''

    access_token = login_session.get('access_token')
    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
    print
    'In gdisconnect access token is %s', access_token
    print
    'User name is: '
    print
    login_session['username']
    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']
        response = make_response(json.dumps('Successfully disconnected.'), 200)
        response.headers['Content-Type'] = 'application/json'
        return redirect('/')
    else:
        response = make_response(json.dumps
                                 ('Failed to revoke token '
                                  'for given user.', 400))
        response.headers['Content-Type'] = 'application/json'
        del login_session['access_token']
        del login_session['gplus_id']
        del login_session['username']
        del login_session['email']
        del login_session['picture']
        return redirect('/')


# show category
@app.route('/')
@app.route('/category/')
def showCategories():
    ''' this route will show the categories list '''

    DBSession = sessionmaker(bind=engine)
    session = DBSession()
    categories = session.query(Category).all()
    return render_template('category.html', categories=categories, )

# JSON api endpoint to showcategories


@app.route('/category/JSON')
def showCategoriesJSON():
    categories = session.query(Category).all()

    return jsonify(Categories=[i.serialize for i in categories])

# show category items by category id


@app.route('/category/<int:category_id>')
@app.route('/category/<int:category_id>/items/')
def showCategory(category_id):
    ''' This route will show the category item of a particular category
    and you can able to add new item if you are logged in '''

    DBSession = sessionmaker(bind=engine)
    session = DBSession()
    category = session.query(Category).filter_by(id=category_id).first()
    categoryItems = session.query(CategoryItem).filter_by(
                                                category_id=category_id).all()

    return render_template(
                        'categorypage.html',
                        category=category,
                        categoryItems=categoryItems)


# JSON api endpoint to show category items by category id

@app.route('/category/<int:category_id>/items/JSON')
def showCategoryJSON(category_id):
    category = session.query(Category).filter_by(id=category_id).first()
    categoryItems = session.query(CategoryItem).filter_by(
        category_id=category_id).all()

    return jsonify(CategoryItems=[i.serialize for i in categoryItems])


# # show categoryitems by item id


@app.route('/category/<int:category_id>/items/<int:item_id>')
def showCategoryItem(category_id, item_id):
    ''' This route will show the details of category item and you
    can able to edit as well as delete if you are creator of that item '''

    DBSession = sessionmaker(bind=engine)
    session = DBSession()
    showItems = session.query(CategoryItem).filter_by(id=item_id).first()

    return render_template('categoryitem.html', showItems=showItems, )


# JSON api endpoint to show category items by item id

@app.route('/category/<int:category_id>/items/<int:item_id>/JSON')
def showCategoryItemJSON(category_id, item_id):
    showItems = session.query(CategoryItem).filter_by(id=item_id).first()

    return jsonify(itemDescription=[showItems.serialize])


# add new category item

@app.route('/category/add/', methods=['GET', 'POST'])
def addCategoryItem():
    ''' This route will go to the add item page where user can create or
    add item if he is authorized to do it, authorization can be done
    by third party api eg: google '''

    DBSession = sessionmaker(bind=engine)
    session = DBSession()
    if 'username' not in login_session:
        return redirect('/login')

    if request.method == 'POST':
        newCategoryItem = CategoryItem(name=request.form['name'],
                                       description=request.form['description'],
                                       category_id=request.form['category'],
                                       user_id=login_session['email'])
        user_id = login_session['email']
        session.add(newCategoryItem)
        session.commit()
        # flash message

        return redirect(url_for('showCategories'))
    else:
        categories = session.query(Category).all()

        return render_template('addcategory.html', categories=categories)


# # edit category items
@app.route('/category/<int:category_id>/items/<int:item_id>/edit',
           methods=['GET', 'POST'])
def editCategory(category_id, item_id):
    
    ''' This route will go to edit page where user can able to view the
    item description and can edit the item if he is creator of that item
    if he is not authorized then he have to login first to being authorized '''

        DBSession = sessionmaker(bind=engine)
        session = DBSession()
        if 'username' not in login_session:
            return redirect('/login')

        categoryItem = session.query(CategoryItem).filter_by(id=item_id).one()

# Check if logged in user is creator of category item
        if categoryItem.user_id != login_session['email']:
            return 'Not authorized'

        category = session.query(Category).filter_by(id=category_id).one()
        categories = session.query(Category).all()

        if request.method == 'POST':
            if request.form['name']:
                categoryItem.name = request.form['name']
            if request.form['description']:
                categoryItem.description = request.form['description']
            if request.form['category']:
                categoryItem.category_id = request.form['category']
            session.add(categoryItem)
            session.commit()

            return redirect(url_for('showCategoryItem',
                                    category_id=categoryItem.category_id,
                                    item_id=categoryItem.id))
        else:
            return render_template('editcategory.html',
                                   categoryItem=categoryItem,
                                   category=category, categories=categories)


# delete category items
@app.route('/category/<int:category_id>/items/<int:item_id>/delete',
           methods=['GET', 'POST'])
def deleteItem(category_id, item_id):

    ''' This route will go to delete page where user can able to view the
    item description and can delete the item if he is creator of that item,
    if he is not authorized then he have to login first to being authorized '''

        DBSession = sessionmaker(bind=engine)
        session = DBSession()
        if 'username' not in login_session:
            return redirect('/login')
        deleteItem = session.query(CategoryItem).filter_by(id=item_id).first()


# check whether user id is in login session
        if deleteItem.user_id != login_session['email']:
            return "Not authorized"

        else:
            session.delete(deleteItem)
            session.commit()
            # flash message

        return redirect(url_for('showCategory',
                                category_id=deleteItem.category_id,
                                item_id=deleteItem.id))
        # '''else:
        #     return render_template('deletecategory.html',
        #                             deleteItem = deleteItem,
        #                             creator = creator)'''

if __name__ == '__main__':
    app.secret_key = 'super_secret_key'
    app.debug = True
    app.run(host='0.0.0.0', port=5000)