project-number-two.py

#!/usr/bin/env python3

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


app = Flask(__name__)

CLIENT_ID = json.loads(
    open('client_secrets.json', 'r').read())['web']['client_id']


# Connect & create Database
engine = create_engine('sqlite:///project-number-two.db')
Base.metadata.bind = engine

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


# login
@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)


# logout
@app.route('/disconnect')
def disconnect():
    if 'provider' in login_session:
        if login_session['provider'] == 'google':
            gdisconnect()
            del login_session['gplus_id']
            del login_session['access_token']
        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 have successfully been logged out.")
        return redirect(url_for('showCategory'))
    else:
        flash("You were not logged in")
        return redirect(url_for('showCategory'))


# Logging in using google account
@app.route('/gconnect', methods=['POST'])
def gconnect():

    # Validation
    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
    # Authorization
    code = request.data

    try:
        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 the access
    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 result.get('error') is not None:
        response = make_response(json.dumps(result.get('error')), 500)
        response.headers['Content-Type'] = 'application/json'
        return response

    # Verify the access
    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

    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
    login_session['access_token'] = credentials.access_token
    login_session['gplus_id'] = gplus_id

    # Get user information
    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']
    login_session['provider'] = 'google'

    # ASK if user exists
    user_id = getUserID(data["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>'
    flash("you are now logged in as %s" % login_session['username'])
    print ("done!")
    return output


# Logout user in google account
@app.route('/gdisconnect')
def gdisconnect():

    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
    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':
        response = make_response(json.dumps('Successfully disconnected.'), 200)
        response.headers['Content-Type'] = 'application/json'
        return response
    else:
        response = make_response(
            json.dumps('Failed to revoke token for given user.', 400))
        response.headers['Content-Type'] = 'application/json'
        return response


# Create user in the database
def createUser(login_session):
    newUser = User(name=login_session['username'], email=login_session[
                   'email'])
    session.add(newUser)
    session.commit()
    user = session.query(User).filter_by(email=login_session['email']).one()
    return user.id


# Get user information from the database
def getUserInfo(user_id):
    user = session.query(User).filter_by(id=user_id).one()
    return user


# Get user id from the database
def getUserID(email):
    try:
        user = session.query(User).filter_by(email=email).one()
        return user.id
    except:
        return None


# JSON APIs endpoints

@app.route('/category/<int:category_id>/item/JSON')
def CategoryItemsJSON(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(Item=[i.serialize for i in items])


@app.route('/category/<int:category_id>/item/<int:item_id>/JSON')
def ItemJSON(category_id, item_id):
    item = session.query(Item).filter_by(id=item_id).one()
    return jsonify(item=item.serialize)


@app.route('/category/JSON')
def categoryJSON():
    category = session.query(Category).all()
    return jsonify(category=[c.serialize for c in category])


@app.route('/')
@app.route('/category/')
def showCategory():
    category = session.query(Category).order_by(asc(Category.name))
    if 'username' not in login_session:
        return render_template('publiccategory.html', category=category)
    else:
        return render_template('categories.html', category=category)


# Show an item
@app.route('/category/<int:category_id>/')
@app.route('/category/<int:category_id>/item/')
def showItem(category_id):
    category = session.query(Category).filter_by(id=category_id).one()
    items = session.query(Item).filter_by(
        category_id=category_id).all()
    if 'username' not in login_session:
        return render_template(
            'publicitem.html',
            items=items, category=category
            )
    else:
        return render_template('item.html', items=items, category=category)


# New category
@app.route('/category/new/', methods=['GET', 'POST'])
def newCategory():
    if 'username' not in login_session:
        return redirect('/login')
    if request.method == 'POST':
        newCategory = Category(
            name=request.form['name'])
        session.add(newCategory)
        flash('New Category %s Successfully added' % newCategory.name)
        session.commit()
        return redirect(url_for('showCategory'))
    else:
        return render_template('newCategory.html')


# Create a new item
@app.route('/category/<int:category_id>/item/new/', methods=['GET', 'POST'])
def newItem(category_id):
    if 'username' not in login_session:
        return redirect('/login')
    category = session.query(Category).filter_by(id=category_id).one()
    if request.method == 'POST':
            newItem = Item(
                name=request.form['name'],
                description=request.form['description'],
                category_id=category_id, user_id=login_session['user_id']
                )
            session.add(newItem)
            session.commit()
            flash('New %s Item Successfully Created' % (newItem.name))
            return redirect(url_for('showItem', category_id=category_id))
    else:
        return render_template('newitem.html', category_id=category_id)


# Edit an item
@app.route(
    '/category/<int:category_id>/item/<int:item_id>/edit',
    methods=['GET', 'POST']
    )
def editItem(category_id, item_id):
    if 'username' not in login_session:
        return redirect('/login')
    item = session.query(Item).filter_by(id=item_id).one()
    if login_session['user_id'] != item.user_id:
        return
    if request.method == 'POST':
        if request.form['name']:
            item.name = request.form['name']
        if request.form['description']:
            item.description = request.form['description']
        session.add(item)
        session.commit()
        flash('Item Successfully Edited')
        return redirect(url_for('showItem', category_id=category_id))
    else:
        return render_template(
            'edititem.html',
            category_id=category_id, item_id=item_id, item=item
        )


# Delete an item
@app.route(
    '/category/<int:category_id>/item/<int:item_id>/delete',
    methods=['GET', 'POST'])
def deleteItem(category_id, item_id):
    if 'username' not in login_session:
        return redirect('/login')

    item = session.query(Item).filter_by(id=item_id).one()

    if login_session['user_id'] != item.user_id:
        return
    if request.method == 'POST':
        session.delete(item)
        session.commit()
        flash('Item Successfully Deleted')
        return redirect(url_for('showItem', category_id=category_id))
    else:
        return render_template('deleteItem.html', item=item)


if __name__ == '__main__':
    app.secret_key = 'super_secret_key'
    app.debug = True
    app.run(host='0.0.0.0', port=8080)