catalog.py

from flask import (Flask,
                   render_template,
                   request,
                   redirect,
                   jsonify,
                   url_for,
                   flash)
from sqlalchemy import create_engine, asc, desc
from sqlalchemy.orm import sessionmaker
from database_setup import Base, Category, Item, User
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
from functools import wraps

debug = False
app = Flask(__name__)

CLIENT_ID = json.loads(
    open('client_secrets.json', 'r').read())['web']['client_id']
APPLICATION_NAME = "The Acme Catalog"

# Connect to Database and create database session
# Set thread check to false to eliminate SQLite thread errors
engine = create_engine('sqlite:///catalog.db',
                       connect_args={'check_same_thread': False})
Base.metadata.bind = engine
DBSession = sessionmaker(bind=engine)
session = DBSession()

# Create anti-forgery state token


@app.route('/login')
def showLogin():
    state = ''.join(
        random.choice(string.ascii_uppercase + string.digits)
        for x in range(32))
    login_session['state'] = state
    CLIENT_ID = "131604815216-8pkcf5v2i7qu8qnos8g8sumvhgtket2u.apps.googleusercontent.com"  # noqa
    # return "The current session state is %s" % login_session['state']
    return render_template('login.html', STATE=state, CLIENT_ID=CLIENT_ID)


@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
    request.get_data()
    code = request.data.decode('utf-8')

    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)
    # Submit request, parse response
    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 then 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)
        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('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'] = access_token
    login_session['gplus_id'] = gplus_id

    # Get user info
    userinfo_url = "https://www.googleapis.com/oauth2/v1/userinfo"
    params = {'access_token': 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 user exists, if not then make a new one
    user_id = getUserID(login_session['email'])
    if not user_id:
        user_id = createUser(login_session)
    login_session['user_id'] = user_id
    output = ''
    output += '<p>Welcome to ACME, '
    output += login_session['username']
    output += '!</p>'
    output += '<img src="'
    output += login_session['picture']
    output += ' " style = "width: 100px; height: 100px;border-radius: 50%;"> '
    flash("you have logged in as %s" % login_session['username'])
    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:
        return None


def userLoggedIn():
    if 'email' in login_session:
        return True
    else:
        return False


def login_required(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if 'username' in login_session:
            return f(*args, **kwargs)
        else:
            flash('You cannot do that without logging in')
            return redirect('/login')
    return decorated_function


app.jinja_env.globals['userLoggedIn'] = userLoggedIn

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


@app.route('/logout')
def logout():
    # Disconnect 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
    url = 'https://accounts.google.com/o/oauth2/revoke?token=%s' % access_token
    h = httplib2.Http()
    result = h.request(url, 'GET')[0]
    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 logged out.'), 200)
    response.headers['Content-Type'] = 'application/json'
    # return response
    return render_template('loggedout.html')

# Routes - map URLs

# JSON API to retrieve items for a given category id


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

# JSON API to retrieve all categories


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


# JSON API to retrieve item details for a given item id and given category id


@app.route('/<int:category_id>/<int:item_id>/JSON')
def categoryItemJSON(category_id, item_id):
    item = session.query(Item).filter_by(id=item_id).one()
    category = session.query(Category).filter_by(id=category_id).one()
    owner = getUserInfo(item.user_id)
    return jsonify(category=category.name, item=item.name,
                   item_description=item.description, owner=owner.name)


# Home: show categories and new items


@app.route('/')
def home():
    newItems = session.query(Item).order_by(Item.id.desc()).limit(15)
    categories = session.query(Category).order_by(asc(Category.name))
    return render_template('home.html',
                           newItems=newItems, categories=categories)

# Show a category


@app.route('/category/<int:category_id>/')
def showCategory(category_id):
    category = session.query(Category).filter_by(id=category_id).one()
    owner = getUserInfo(category.user_id)
    items = session.query(Item).filter_by(
        category_id=category_id).all()
    if 'username' not in login_session or owner.id != login_session['user_id']:
        return render_template('publiccategory.html',
                               items=items, category=category, owner=owner)
    else:
        return render_template('privatecategory.html',
                               items=items, category=category, owner=owner)

# Create a new category


@app.route('/category/new/', methods=['GET', 'POST'])
@login_required
def newCategory():
    if request.method == 'POST':
        newCategory = Category(
            name=request.form['name'], user_id=login_session['user_id'])
        session.add(newCategory)
        flash('New Category %s Successfully Created' % newCategory.name)
        session.commit()
        return redirect(url_for('home'))
    else:
        return render_template('newCategory.html')

# Edit a category


@app.route('/category/<int:category_id>/edit/', methods=['GET', 'POST'])
@login_required
def editCategory(category_id):
    editedCategory = session.query(
        Category).filter_by(id=category_id).one()
    if editedCategory.user_id != login_session['user_id']:
        return "<script>function myFunction() {alert('Create your own category if you want to edit it!');window.history.back();}</script><body onload='myFunction()''>"  # noqa
    if request.method == 'POST':
        if request.form['name']:
            editedCategory.name = request.form['name']
            flash('Category Successfully Edited %s' % editedCategory.name)
            session.commit()
            return redirect(url_for('home'))
    else:
        return render_template('editCategory.html', category=editedCategory)

# Delete a category


@app.route('/category/<int:category_id>/delete/', methods=['GET', 'POST'])
@login_required
def deleteCategory(category_id):
    category = session.query(Category).filter_by(id=category_id).one()
    categoryToDelete = session.query(
        Category).filter_by(id=category_id).one()
    itemsInCategory = session.query(Item).filter_by(
        category_id=category_id).all()
    if categoryToDelete.user_id != login_session['user_id']:
        return "<script>function myFunction() {alert('Create your own category if you want to delete a category!');window.history.back();}</script><body onload='myFunction()''>"  # noqa
    if itemsInCategory != []:
        flash('Please delete all items in this category before deleting it!')
        return redirect(url_for('showCategory', category_id=category_id))
    if request.method == 'POST':
        session.delete(categoryToDelete)
        flash('%s Successfully Deleted' % categoryToDelete.name)
        session.commit()
        return redirect(url_for('home', category_id=category_id))
    else:
        return render_template('deleteCategory.html',
                               category=categoryToDelete)

# Create a new item


@app.route('/item/<int:category_id>/new/', methods=['GET', 'POST'])
@login_required
def newItem(category_id):
    category = session.query(Category).filter_by(id=category_id).one()
    if login_session['user_id'] != category.user_id:
        return "<script>function myFunction() {alert('Create you own category if you want to add items!');window.history.back();}</script><body onload='myFunction()''>"  # noqa
    if request.method == 'POST':
        newItem = Item(
            name=request.form['name'],
            description=request.form['description'],
            category_id=category_id,
            user_id=category.user_id
        )
        session.add(newItem)
        session.commit()
        flash('New %s Item Successfully Created' % (newItem.name))
        return redirect(url_for('showCategory', category_id=category_id))
    else:
        return render_template('newitem.html', category_id=category_id)

# Show item detail


@app.route('/item/<int:item_id>/')
def showItem(item_id):
    item = session.query(Item).filter_by(id=item_id).one()
    owner = getUserInfo(item.user_id)
    return render_template('item.html', item=item, owner=owner)

# Edit an item


@app.route('/item/<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()
    category = session.query(Category).filter_by(id=category_id).one()
    if login_session['user_id'] != category.user_id:
        return "<script>function myFunction() {alert('Create your own category and items if you want to edit them!');window.history.back();}</script><body onload='myFunction()''>"  # noqa
    if request.method == 'POST':
        if request.form['name']:
            editedItem.name = request.form['name']
        if request.form['description']:
            editedItem.description = request.form['description']
        session.add(editedItem)
        session.commit()
        flash('Item Successfully Edited')
        return redirect(url_for('showCategory', category_id=category_id))
    else:
        return render_template('editItem.html',
                               category_id=category_id, item=editedItem)

# Delete an item


@app.route('/item/<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()
    category = session.query(Category).filter_by(id=category_id).one()
    if login_session['user_id'] != category.user_id:
        return "<script>function myFunction() {alert('Create your own category and items if you want to delete them!');window.history.back();}</script><body onload='myFunction()''>"  # noqa
    if request.method == 'POST':
        session.delete(itemToDelete)
        session.commit()
        flash('Item Successfully Deleted')
        return redirect(url_for('showCategory', category_id=category_id))
    else:
        return render_template('deleteItem.html',
                               category_id=category_id, item=itemToDelete)


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