__init__.py

from flask import (
    Flask,
    request,
    render_template,
    jsonify,
    url_for,
    redirect,
    flash,
    json,
    make_response
)
import requests
from sqlalchemy import create_engine, desc
from sqlalchemy.orm import sessionmaker, relationship
from sqlalchemy.ext.declarative import declarative_base
from models import Base, Item, Category, 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

app = Flask(__name__)

# Connect and create db session
engine = create_engine('postgresql://catalog:bill2012@localhost/catalog')
Base.metadata.bind = engine
DBSession = sessionmaker(bind=engine)
session = DBSession()

CLIENT_ID = json.loads(
    open('/var/www/LinuxServer/LinuxServer/client_secrets.json', 'r').read())['web']['client_id']
APPLICATION_NAME = "Item-Catalog"


# 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
    return render_template('login.html', STATE=state, CLIENT_ID=CLIENT_ID)


# Disconnect based on provider
@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']
        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('catalogFunction'))


# Create Login with Google account
@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('/var/www/LinuxServer/LinuxServer/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()
    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)
        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'] = 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.get('name', '')
    login_session['picture'] = data['picture']
    login_session['email'] = data['email']
    login_session['provider'] = 'google'

    # see if user exists, if it doesn't 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 += '<h1>Welcome, '
    output += login_session['username']
    output += '!</h1>'
    output += '<img src="'
    output += login_session['picture']
    output += ' " style = "width: 300px; height: '
    output += '300px;border-radius: 150px;-webkit-border-radius: '
    output += '150px;-moz-border-radius: 150px;"> '
    flash("you are now 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_or_none()
    return user


def getUserID(email):
    try:
        user = session.query(User).filter_by(email=email).one()
        return user.id
    except BaseException:
        return None


# Create Logout for Google account
@app.route('/gdisconnect')
def gdisconnect():
    # Only disconnect a connected 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]
    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


# Add JSON API Endpoint for categories
# Fix: display items into the correct catalog
@app.route('/category/JSON')
def categoriesJSON():
    category = session.query(Category)
    items = session.query(Item).filter_by(category_id=Item.category_id).all()
    return jsonify(Categories=[
        i.serialize for i in category], Items=[i.serialize for i in items])


# Add JSON API Endpoint for a category items
@app.route('/category/<int:category_id>/items/JSON')
def categoriesItemsJSON(category_id):
    category2 = 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])


# Add JSON API Endpoint for a item
@app.route('/category/<int:category_id>/items/<int:item_id>/JSON')
def itemJSON(category_id, item_id):
    items = session.query(Item).filter_by(id=item_id).one()
    return jsonify(Items=items.serialize)


# Create route to list all categories
@app.route('/')
@app.route('/category')
def catalogFunction():
    category = session.query(Category)
    items = session.query(Item).filter_by(
        category_id=Item.category_id).order_by(Item.id.desc()).limit(8).all()
    # Check if user is logged. If not, display the public page
    if 'username' not in login_session:
        # Check if have categories to display. If not show a message
        if category.count() == 0:
            flash("You have no categories yet!")
            return render_template(
                'publicCatalog.html', plantas=category, itemName=items)
        else:
            return render_template(
                'publicCatalog.html', plantas=category, itemName=items)
    # If logged user, display the logged users page
    else:
        # Check if have categories to display. If not show a message
        if category.count() == 0:
            flash("You have no categories yet!")
            return render_template(
                'catalog.html', plantas=category, itemName=items)
        else:
            return render_template(
                'catalog.html', plantas=category, itemName=items)


# Create the app.route functions for create a new category
@app.route('/category/new', methods=['GET', "POST"])
def newCategoryFunction():
    category = session.query(Category)
    # Check if user is logged. If not, redirect to login page
    if 'username' not in login_session:
        return redirect('/login')
    # Get the new category name from newCategory page
    if request.method == 'POST':
        newCategory = Category(
            name=request.form['name'], user_id=login_session['user_id'])
        session.add(newCategory)
        session.commit()
        flash("New category created!")
        return redirect(url_for('catalogFunction', category=category))
    else:
        return render_template('newCategory.html', category=category)


# Create route for edit a category
@app.route('/category/<int:category_id>/edit', methods=['GET', "POST"])
def editCategoryFunction(category_id):
    category2 = session.query(Category).filter_by(id=category_id).first()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    # Check if user is logged. If not, redirect to login page
    if 'username' not in login_session:
        return redirect('/login')
    if login_session['user_id'] != category2.user_id:
        flash("You not authorizated to edit this category.")
        return redirect(url_for('catalogFunction'))
    # Receive edited category name from the editCategory page
    if request.method == 'POST':
        if request.form['name']:
            category2.name = request.form['name']
        session.add(category2)
        session.commit()
        flash("The category was seccessfully edited!")
        return redirect(url_for('catalogFunction', category2=category2))
    else:
        return render_template('editCategory.html', category2=category2)


# Create route for delete a category
@app.route('/category/<int:category_id>/delete', methods=['GET', "POST"])
def deleteCategoryFunction(category_id):
    category = session.query(Category)
    category2 = session.query(Category).filter_by(id=category_id).first()
    deleteItem = session.query(Item).filter_by(
                                        category_id=category2.id).delete()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    # Check if user is logged. If not, redirect to login page
    if 'username' not in login_session:
        return redirect('/login')
    # check if the logged user is the owner of the category
    if login_session['user_id'] != category2.user_id:
        flash("You not authorizated to edit this category.")
        return redirect(url_for('catalogFunction'))
    # Receive edited category name from the editCateg
    # Receive delete category from the editCategory page
    if request.method == 'POST':
        session.delete(category2)
        session.commit()
        flash("Category and his items was seccessfully deleted!")
        return redirect(url_for('catalogFunction', plantas=category))
    else:
        return render_template('deleteCategory.html', category2=category2)


# Create route to display the items for the selected category
@app.route('/category/<int:category_id>/items')
def categoryFunction(category_id):
    category = session.query(Category)
    category2 = session.query(Category).filter_by(id=category_id).first()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    items = session.query(Item).filter_by(category_id=category2.id)
    # Check if user is logged. If not, display the public page
    if 'username' not in login_session:
        # Check if have items in db
        if items.count() == 0:
            flash("You have no items yet!")
            return render_template(
                'publicCategory.html',
                plantas=category, plantas2=category2, itemName=items)
        else:
            return render_template(
                'publicCategory.html',
                plantas=category, plantas2=category2, itemName=items)
    # If logged user, display the logged users page
    else:
        # Check if have items in db
        if items.count() == 0:
            flash("You have no items yet!")
            return render_template(
                'category.html',
                plantas=category, plantas2=category2, itemName=items)
        else:
            return render_template(
                'category.html',
                plantas=category, plantas2=category2, itemName=items)


# Create the app.route function to display item
@app.route('/category/<int:category_id>/items/<int:item_id>')
def itemFunction(category_id, item_id):
    category2 = session.query(Category).filter_by(id=category_id).first()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    items = session.query(Item).filter_by(id=item_id).first()
    # Check if the inserted items id exist in db
    if not hasattr(items, 'id'):
        return "this item not exist"
    # check if iserted item_id has the same iserted category_id as atribute
    if items.category_id != category_id:
        return "This item not exist in this category"
    # Check if user is logged. If not, redirect to the login page
    if 'username' not in login_session:
        return render_template(
            'publicItem.html', itemName=items, category=category2)
    else:
        return render_template('item.html', itemName=items, category=category2)


# Create the app.route function to add new item to category
@app.route('/category/<int:category_id>/items/new', methods=['GET', "POST"])
def newItemFunction(category_id):
    category = session.query(Category)
    category2 = session.query(Category).filter_by(id=category_id).first()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    # Check if user is logged. If not, redirect to the login page
    if 'username' not in login_session:
        return redirect('/login')
    # Receive new item infos from the newItem page
    if request.method == 'POST':
        newItem = Item(
            name=request.form['name'], description=request.form['description'],
            category_id=request.form[
                'category'], user_id=login_session['user_id'])
        session.add(newItem)
        session.commit()
        flash("New menu item created!")
        return redirect(url_for(
            'categoryFunction', category_id=newItem.category_id))
    else:
        return render_template(
            'newItem.html', category=category, category2=category2)


# Create the app.route function to edit item
@app.route('/category/<int:category_id>/items/<int:item_id>/edit',
           methods=['GET', 'POST'])
def editItemFunction(category_id, item_id):
    category = session.query(Category)
    category2 = session.query(Category).filter_by(id=category_id).first()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    editItem = session.query(Item).filter_by(id=item_id).first()
    # Check if the inserted items id exist in db
    if not hasattr(editItem, 'id'):
        return "this item not exist"
    # check if iserted item_id has the same iserted category_id as atribute
    if editItem.category_id != category_id:
        return "This item not exist in this category"
    # Check if user is logged. If not, redirect to the login page
    if 'username' not in login_session:
        return redirect('/login')
    # Check if the logged user is the creator of the item. If not, display
    # an authorization error message
    if login_session['user_id'] != editItem.user_id:
        flash("You not authorizated to edit this item.")
        return redirect(url_for('catalogFunction'))
    # Receive the edited item infos from the editItem page
    if request.method == 'POST':
        if request.form['name']:
            editItem.name = request.form['name']
        if request.form['description']:
            editItem.description = request.form['description']
        if request.form['category']:
            editItem.category_id = request.form['category']
        session.add(editItem)
        session.commit()
        flash("Item seccessfully edited!")
        return redirect(url_for(
            'itemFunction', category_id=editItem.category_id, item_id=item_id))
    else:
        return render_template(
            'editItem.html',
            category=category, category2=category2, editItem=editItem)


# Create the app.route function to delete a item
@app.route('/category/<int:category_id>/items/<int:item_id>/delete',
           methods=['GET', "POST"])
def deleteItemFunction(category_id, item_id):
    category2 = session.query(Category).filter_by(id=category_id).first()
    # Check if the inserted category id exist in db
    if not hasattr(category2, 'id'):
        return "this category not exist"
    deleteItem = session.query(Item).filter_by(id=item_id).first()
    # Check if the inserted items id exist in db
    if not hasattr(deleteItem, 'id'):
        return "this item not exist"
    # check if iserted item_id has the same iserted category_id as atribute
    if deleteItem.category_id != category_id:
        return "This item not exist in this category"
    # Check if user is logged. If not, redirect to the login page
    if 'username' not in login_session:
        return redirect('/login')
    # Check if the logged user is the creator of the item. If not, display
    # an authorization error message
    if login_session['user_id'] != deleteItem.user_id:
        flash("You not authorizated to delete this item.")
        return redirect(url_for('catalogFunction'))
    # Receive the delete to delete from the deleteItem page
    if request.method == 'POST':
        session.delete(deleteItem)
        session.commit()
        flash("Menu item seccessfully deleted!")
        return redirect(url_for('categoryFunction', category_id=category2.id))
    else:
        return render_template(
            'deleteItem.html', category_id=category_id, item=deleteItem)


if __name__ == '__main__':
    app.secret_key = 'super_secret_key'
    app.run()