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main.py
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main.py
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#!/usr/bin/env python
""" Main catalog application module. Intended for deployment using Flask.
Built for Flask Framework. Uses Python 2.7.
Connects to database using SQLAlchemy with database_setup.py.
Imports database config, API keys & application secrets using config.py
See README file for more info.
"""
import os
import random
import string
import urllib
import httplib2
import json
import requests
from flask import (Flask, request, redirect, session as login_session,
jsonify, render_template, make_response, flash, url_for)
from PIL import Image
from werkzeug import secure_filename
import sqlalchemy.orm.exc
from database_setup import Category, Item, User
from config import (session, APP_SECRET, MS_APP_ID, MS_SECRET,
MS_MAIN_URL, MS_CONNECT_URL, GOOGLE_APP_ID)
from oauth2client.client import flow_from_clientsecrets
from oauth2client.client import FlowExchangeError
from flask_wtf.csrf import CSRFProtect
app = Flask(__name__)
csrf = CSRFProtect(app)
app.secret_key = APP_SECRET # imported from config.ini
UPLOAD_FOLDER = './static/images/'
ALLOWED_EXTENSIONS = set(['png', 'jpg', 'jpeg'])
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
def make_user(login_session):
new_user = User(name=login_session['username'],
email=login_session['email'])
session.add(new_user)
session.commit()
user = session.query(User).filter_by(email=login_session['email']).one()
return user.id
def user_by_session_id():
user = session.query(User).filter_by(id=login_session['user_id']).one()
if user:
return user
def userid_by_email(email):
try:
user = session.query(User).filter_by(email=email).one()
return user.id
except sqlalchemy.orm.exc.NoResultFound:
return None
def allowed_file(filename):
return '.' in filename and \
filename.rsplit('.', 1)[1] in ALLOWED_EXTENSIONS
def save_image(file):
if file and allowed_file(file.filename.lower()):
filename = secure_filename(file.filename)
file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))
return filename
else:
return None
def save_image_as_jpg(image_path):
""" Takes uploaded image, and saves it in jpg format """
try:
filename = image_path.split('/')[-1]
filename_no_extension = filename.split('.')[0]
image_file = Image.open(image_path)
image_file.save(UPLOAD_FOLDER + filename_no_extension + '.jpg')
image_file.close()
return True
except IOError:
return False
def itemCard(item):
""" Used in templates to create cards which display item info """
return render_template('card.html', item=item)
# Add itemCard to jinja globals so it can be called in templates
app.jinja_env.globals.update(itemCard=itemCard)
# Front Page
@app.route('/')
def FrontPage():
categories = session.query(Category).all()
items = session.query(Item).all()
return render_template('frontpage.html',
categories=categories,
items=items)
def potential_new_category(name):
""" Create a new category unless one by that name exists """
category = session.query(Category).filter_by(name=name).one_or_none()
if category:
return category
if category is None:
category = Category(name=name)
session.add(category)
session.commit()
return category
def add_photo_to_database(filename, item):
if filename is not None:
file_path = UPLOAD_FOLDER + filename
file = open(file_path, "r")
file_contents = file.read()
file.close()
os.remove(file_path)
new_filename = 'itemimg-' + str(item.id) + '-'
# give the file a unique name to avoid browser caching stale images
new_filename += str(id(file_contents)) + '.jpg'
new_file_path = UPLOAD_FOLDER + new_filename
new_file = open(new_file_path, "w")
new_file.write(file_contents)
new_file.close()
save_image_as_jpg(UPLOAD_FOLDER + new_filename)
item.photo_path = "/static/images/" + new_filename
session.add(item)
session.commit()
def submitted_category(form_data):
""" Takes a /newitem form submission and assign a valid category """
if 'category' in form_data:
submitted_category = form_data['category']
return submitted_category
# Add item
@app.route('/newitem/', methods=['GET', 'POST'])
def AddNewItem():
if 'username' not in login_session:
return redirect(url_for('Login'))
if request.method == 'GET':
categories = session.query(Category).all()
return render_template('additem.html', categories=categories)
if request.method == 'POST':
form_data = request.form
item_category = potential_new_category(submitted_category(form_data))
file = request.files['item-image']
filename = save_image(file)
newItem = Item(name=request.form['item-name'],
description=request.form['item-description'],
category=item_category,
user_id=login_session['user_id'])
session.add(newItem)
session.commit()
add_photo_to_database(filename, newItem)
flash('Item added successfully.')
return redirect(url_for('FrontPage'))
# View item
@app.route('/item/<int:item_id>/')
def ViewItem(item_id):
item_to_view = session.query(Item).filter_by(id=item_id).one()
return render_template('viewitem.html', item=item_to_view)
# Edit item
@app.route('/item/<int:item_id>/edit/', methods=['GET', 'POST'])
def EditItem(item_id):
if 'username' not in login_session:
return redirect(url_for('Login'))
item = session.query(Item).filter_by(id=item_id).one()
if item.user_id != userid_by_email(login_session['email']):
return "You are not the owner of this item."
if request.method == 'GET':
categories = session.query(Category).all()
item_to_edit = session.query(Item).filter_by(id=item_id).one()
return render_template('edititem.html',
categories=categories, item=item_to_edit)
if request.method == 'POST':
item_to_edit = session.query(Item).filter_by(id=item_id).one()
file = request.files['new-item-image']
filename = save_image(file)
add_photo_to_database(filename, item_to_edit)
submitted_category = request.form['category']
item_category = potential_new_category(submitted_category)
item_to_edit.name = request.form['new-item-name']
item_to_edit.description = request.form['new-item-description']
item_to_edit.category = item_category
session.add(item_to_edit)
session.commit()
flash('Item updated.')
return redirect(url_for('MyItems'))
# Delete item
@app.route('/item/<int:item_id>/delete/', methods=['GET', 'POST'])
def DeleteItem(item_id):
if 'username' not in login_session:
return redirect(url_for('Login'))
item = session.query(Item).filter_by(id=item_id).one()
if item.user_id != userid_by_email(login_session['email']):
return "You are not the owner of this item."
if request.method == 'GET':
return render_template('deleteitem.html', item=item)
if request.method == 'POST':
session.delete(item)
session.commit()
flash('Item removed from catalog.')
return redirect(url_for('FrontPage'))
# Login
@app.route('/login/')
def Login():
state = ''.join(random.choice(string.ascii_uppercase +
string.digits) for x in xrange(32))
login_session['state'] = state
ms_auth_url = 'https://login.microsoftonline.com/common/oauth2/v2.0/authorize?' # NOQA
ms_auth_params = {"client_id": MS_APP_ID,
"scope": "user.read",
"response_type": "code",
"response_mode": "query",
"redirect_uri": MS_CONNECT_URL,
"state": state}
ms_auth_url += urllib.urlencode(ms_auth_params)
return render_template('login.html', STATE=state, ms_url=ms_auth_url,
google_app_id=GOOGLE_APP_ID)
def error_response_auth_flow(message):
response = make_response(json.dumps(message), 401)
response.headers['Content-Type'] = 'application/json'
return response
@app.route('/gconnect', methods=['POST'])
def gconnect():
""" Google OAUTH2 Callback """
# Validate state token
if request.args.get('state') != login_session['state']:
return error_response_auth_flow('Invalid state parameter.')
# 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:
return error_response_auth_flow('Failed upgrading authorization 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:
return error_response_auth_flow(result.get('error'))
# Verify that the access token is used for the intended user.
gplus_id = credentials.id_token['sub']
if result['user_id'] != gplus_id:
return error_response_auth_flow("User ID mismatch")
# Verify that the access token is valid for this app.
if result['issued_to'] != GOOGLE_APP_ID:
return error_response_auth_flow("Token client ID mismatch")
stored_credentials = login_session.get('credentials')
stored_gplus_id = login_session.get('gplus_id')
if stored_credentials 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['email'] = data['email']
if userid_by_email(login_session['email']) is None:
make_user(login_session)
login_session['user_id'] = userid_by_email(login_session['email'])
login_session['auth_provider'] = 'google'
output = ''
output += '<h1>Welcome, '
output += login_session['username']
output += '!</h1>'
return output
@app.route('/msconnect/')
def msconnect():
""" Microsoft OAUTH2 callback """
if request.args.get('state') != login_session['state']:
return error_response_auth_flow('Invalid state parameter.')
code = request.args.get('code')
# Exchange the auth code for a token
token_url = 'https://login.microsoftonline.com/common/oauth2/v2.0/token'
request_data = {'client_id': MS_APP_ID,
'scope': 'user.read',
'grant_type': 'authorization_code',
'redirect_uri': MS_CONNECT_URL,
'client_secret': MS_SECRET,
'code': code}
token_request = requests.post(token_url, data=request_data)
token_response = token_request.json()
access_token = token_response['access_token']
# Use the access token to get the users info
info_url = 'https://graph.microsoft.com/v1.0/me'
info_request = requests.get(info_url, headers={'Authorization': 'Bearer %s'
% access_token})
data = info_request.json()
login_session['username'] = data['displayName']
login_session['email'] = data['userPrincipalName']
if userid_by_email(login_session['email']) is None:
make_user(login_session)
login_session['user_id'] = userid_by_email(login_session['email'])
login_session['auth_provider'] = 'microsoft'
return redirect(url_for('FrontPage'))
@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':
del login_session['access_token']
del login_session['username']
del login_session['email']
del login_session['gplus_id']
del login_session['user_id']
del login_session['auth_provider']
flash('Logged out of your Google account.')
return redirect(url_for('FrontPage'))
@app.route('/msdisconnect/')
def msdisconnect():
del login_session['username']
del login_session['email']
del login_session['user_id']
del login_session['auth_provider']
logout_url = 'https://login.live.com/oauth20_logout.srf?'
logout_params = {'client_id': MS_APP_ID,
'redirect_uri': MS_MAIN_URL}
logout_url += urllib.urlencode(logout_params)
flash('Logged out of your Microsoft account.')
return redirect(logout_url)
@app.route('/logout/', methods=['POST'])
def logout():
if login_session['auth_provider'] == 'google':
return redirect(url_for('gdisconnect'))
if login_session['auth_provider'] == 'microsoft':
return redirect(url_for('msdisconnect'))
# JSON item
@app.route('/item/<int:item_id>/json/')
def ItemJson(item_id):
item = session.query(Item).filter_by(id=item_id).one()
return jsonify(Item=item.serialize)
# View Category
@app.route('/category/<category_name>/')
def ViewCategory(category_name):
all_items = session.query(Item).all()
categories = session.query(Category).all()
items_in_category = []
for item in all_items:
if item.category.name.lower() == category_name.lower():
items_in_category.append(item)
return render_template('viewcategory.html',
category_name=category_name,
categories=categories,
items=items_in_category)
# My items view
@app.route('/myitems/')
def MyItems():
if 'username' not in login_session:
return redirect(url_for('Login'))
user_id = login_session['user_id']
users_items = session.query(Item).filter_by(user_id=user_id).all()
response = make_response(render_template('myitems.html',
items=users_items))
response.cache_control.no_store = True
response.cache_control.no_cache = True
return response
if __name__ == '__main__':
app.debug = True
app.run(host='0.0.0.0', port=5000)