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project.py
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project.py
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from flask import Flask, render_template as flask_render, request, redirect, url_for, jsonify, flash, make_response, session as login_session
from flask_cors import CORS
import random
import string
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from models import Category, Item, User
from database_setup import Base
from oauth2client import client, crypt
from apiclient import discovery
import httplib2
import json
import requests
from functools import wraps
app = Flask(__name__)
CORS(app)
engine = create_engine('sqlite:///catalog.db')
Base.metadata.bind = engine
DBSession = sessionmaker(bind=engine)
session = DBSession()
CLIENT_ID = json.loads(
open('client_secret.json', 'r').read())['web']['client_id']
def render_template(template_name, **params):
params['logged_in'] = 'username' in login_session
return flask_render(template_name, **params)
def login_required(f):
"""
Decorator function used to secure pages available only for logged in users.
"""
@wraps(f)
def decorated_function(*args, **kwargs):
if 'username' not in login_session:
flash('Only authenticated users can access item edit form', 'error')
return redirect(url_for('login'))
return f(*args, **kwargs)
return decorated_function
@app.route('/login')
def login():
"""
Shows login view with Google Auth.
"""
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)
@app.route('/gconnect', methods=['POST'])
def gconnect():
"""
Performs the Google Auth using oAuth and information from user's
account. Creates a new session and store values like user_id and name.
"""
# If this request does not have `X-Requested-With` header, this could be a
# CSRF
if not request.headers.get('X-Requested-With'):
response = make_response(json.dumps('Invalid state'), 403)
response.headers['Content-type'] = 'application/json'
return response
auth_code = request.data
CLIENT_SECRET_FILE = 'client_secret.json'
# Exchange auth code for access token, refresh token, and ID token
credentials = client.credentials_from_clientsecrets_and_code(
CLIENT_SECRET_FILE, ['profile', 'email'],
auth_code)
# 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 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
# 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()
# Store the access token in the session for later use.
login_session['access_token'] = credentials.access_token
login_session['username'] = data['name']
login_session['picture'] = data['picture']
login_session['email'] = data['email']
user_id = get_user_id(login_session['email'])
if not user_id:
user_id = create_user(login_session)
login_session['user_id'] = user_id
response = make_response(json.dumps('User was logged in!'), 200)
response.headers['Content-Type'] = 'application/json'
return response
@app.route('/logout')
def logout():
"""
Revokes the Google Auth using oAuth and information from user's
account and deletes all the information from the session.
"""
access_token = login_session['access_token']
# if there's no access token just redirect to main page
if access_token is None:
return redirect(url_for('catalog'))
# revoke if present
url = 'https://accounts.google.com/o/oauth2/revoke?token=%s' % login_session['access_token']
h = httplib2.Http()
result = h.request(url, 'GET')[0]
if result['status'] == '200':
print "Token revoked."
# clear the session
del login_session['access_token']
del login_session['email']
del login_session['username']
del login_session['picture']
# show main page
return redirect(url_for('catalog'))
@app.route('/')
def catalog():
"""
Shows the main page with categories and 10 latest items added.
"""
latest_items = session.query(Item).order_by(
'created_at desc').limit(12).all()
categories = session.query(Category).all()
return render_template(
'main.html',
categories=categories,
recent_items=latest_items)
@app.route('/api/categories/')
def api_categories():
"""
Return the list of categories as JSON.
"""
categories = session.query(Category).all()
return jsonify(categories=[category.serialize for category in categories])
@app.route('/categories/new', methods=['GET', 'POST'])
@login_required
def new_category():
"""
Renders the form to create a new category and save it in database if all the
information was entered correctly.
"""
if request.method == 'POST':
new_category = Category(
title=request.form['title'], user_id=login_session['user_id'])
session.add(new_category)
flash('Category %s successfully created!' % new_category.title)
session.commit()
return redirect(url_for('catalog'))
else:
return render_template('new_category.html')
@app.route('/categories/<int:category_id>/edit', methods=['GET', 'POST'])
@login_required
def edit_category(category_id):
"""
Renders the form to edit a specific category and save it in database if all
the information was entered correctly.
"""
user_id = login_session['user_id']
edited_category = session.query(
Category).filter_by(id=category_id).one()
if not edited_category.user_id == user_id:
return redirect(url_for('catalog'))
if request.method == 'POST':
if request.form['title']:
edited_category.title = request.form['title']
session.add(edited_category)
flash("Category has been edited")
session.commit()
return redirect(url_for('catalog'))
else:
return render_template(
'edit_category.html',
category=edited_category)
@app.route('/categories/<int:category_id>/delete', methods=['GET', 'POST'])
@login_required
def delete_category(category_id):
"""
Renders the form to delete a specific category and delete it from database.
"""
user_id = login_session['user_id']
category_to_delete = session.query(
Category).filter_by(id=category_id).one()
if not category_to_delete.user_id == user_id:
return redirect(url_for('catalog'))
if request.method == 'POST':
session.delete(category_to_delete)
session.commit()
flash("Category has been deleted!")
return redirect(url_for('catalog'))
else:
return render_template(
'delete_category.html',
category=category_to_delete)
@app.route('/categories/<int:category_id>')
def category_items(category_id):
"""
Renders the items from given category as JSON.
"""
category = session.query(
Category).filter_by(id=category_id).one()
items = session.query(Item).filter_by(category_id=category_id)
is_owner = category.user_id == get_session_user_id()
return render_template(
'category_items.html',
category=category,
items=items,
is_owner=is_owner)
@app.route('/api/categories/<int:category_id>')
def api_category_items(category_id):
"""
Return the list of items in given category
"""
items = session.query(Item).filter_by(category_id=category_id).all()
return jsonify(items=[item.serialize for item in items])
@app.route('/categories/<int:category_id>/items/<int:item_id>')
def item_details(category_id, item_id):
"""
Renders the item with given item_id.
"""
category = session.query(Category).filter_by(id=category_id).one()
item = session.query(Item).filter_by(id=item_id).one()
is_owner = item.user_id == get_session_user_id()
return render_template(
'item_details.html', category=category, item=item, is_owner=is_owner)
@app.route('/api/items/<int:item_id>')
def api_item_details(item_id):
"""
Return the details of item with given id as JSON
"""
try:
item = session.query(Item).filter_by(id=item_id).one()
return jsonify(item.serialize)
except BaseException:
return make_response(json.dumps('Invalid item id!'), 404)
@app.route('/categories/<int:category_id>/new', methods=['GET', 'POST'])
@login_required
def new_item(category_id):
"""
Renders the form to create a new item for a category and save it in
database if all the information was entered correctly.
"""
category = session.query(Category).filter_by(id=category_id).one()
user_id = login_session['user_id']
if request.method == 'POST':
new_item = Item(title=request.form['title'],
description=request.form['description'],
category_id=category_id,
user_id=user_id)
session.add(new_item)
session.commit()
flash("Item has been created!")
return redirect(url_for('category_items', category_id=category_id))
else:
return render_template(
'new_item.html',
category_id=category_id)
@app.route('/categories/<int:category_id>/<int:item_id>/edit',
methods=['GET', 'POST'])
@login_required
def edit_item(category_id, item_id):
"""
Renders the form to edit a specific item and save it in database if all
the information was entered correctly.
"""
user_id = login_session['user_id']
edited_item = session.query(Item).filter_by(id=item_id).one()
if not edited_item.user_id == user_id:
return redirect(url_for('catalog'))
if request.method == 'POST':
if request.form['title']:
edited_item.title = request.form['title']
if request.form['description']:
edited_item.description = request.form['description']
session.add(edited_item)
flash("Item has been edited!")
session.commit()
return redirect(url_for('category_items', category_id=category_id))
else:
return render_template(
'edit_item.html',
category_id=category_id,
item=edited_item)
@app.route('/categories/<int:category_id>/<int:item_id>/delete',
methods=['GET', 'POST'])
@login_required
def delete_item(category_id, item_id):
"""
Renders the form to delete a specific item and delete it from database.
"""
user_id = login_session['user_id']
item_to_delete = session.query(Item).filter_by(id=item_id).one()
if not item_to_delete.user_id == user_id:
return redirect(url_for('catalog'))
if request.method == 'POST':
session.delete(item_to_delete)
session.commit()
flash("Item has been deleted!")
return redirect(url_for('category_items', category_id=category_id))
else:
return render_template(
'delete_item.html',
category_id=category_id,
item=item_to_delete)
# Helper methods for creating/getting user info
def create_user(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 get_user_info(user_id):
user = session.query(User).filter_by(id=user_id).one()
return user
def get_user_id(email):
try:
user = session.query(User).filter_by(email=email).one()
return user.id
except BaseException:
return None
def get_session_user_id():
try:
return login_session['user_id']
except Exception:
return -1
if __name__ == '__main__':
app.secret_key = 'super_secret_key'
app.debug = True
app.run(host='0.0.0.0', port=5000)