calendarwatch_frontend/app.py

# Python standard libraries
import json
import os
import sqlite3

# Third-party libraries
import flask
from flask import Flask, redirect, request, url_for
from flask_login import (
    LoginManager,
    current_user,
    login_required,
    login_user,
    logout_user,
)
from oauthlib.oauth2 import WebApplicationClient
import requests

# Internal imports
from database.db import init_db_command
from database.user import User
from database.user import dbCalendar

import backend.caltojson as caltojson

import google.oauth2.credentials
import google_auth_oauthlib.flow
import googleapiclient.discovery

# Configuration

CLIENT_SECRETS_FILE = "certificate/client_secret.json"

# This OAuth 2.0 access scope allows for full read/write access to the
# authenticated user's account and requires requests to use an SSL connection.
SCOPES = ["https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile", "https://www.googleapis.com/auth/calendar.readonly", "openid"]
API_SERVICE_NAME = 'calendar'
API_VERSION = 'v3'

GOOGLE_CLIENT_ID ="377787187748-shuvi4iq5bi4gdet6q3ioataimobs4lh.apps.googleusercontent.com"
GOOGLE_CLIENT_SECRET = "Hu_YWmKsVKUcLwyeINYzdKfZ"
GOOGLE_DISCOVERY_URL = (
    "https://accounts.google.com/.well-known/openid-configuration"
)
# Flask app setup
app = Flask(__name__,
            static_folder='static',
            template_folder='template')
app.secret_key = os.environ.get("SECRET_KEY") or os.urandom(24)

# User session management setup
# https://flask-login.readthedocs.io/en/latest
login_manager = LoginManager()
login_manager.init_app(app)

# Naive database setup
try:
    init_db_command()
except sqlite3.OperationalError:
    # Assume it's already been created
    pass

# OAuth 2 client setup
client = WebApplicationClient(GOOGLE_CLIENT_ID)

# Flask-Login helper to retrieve a user from our db
@login_manager.user_loader
def load_user(user_id):
    return User.get(user_id)

@app.route("/")
def account():
    return flask.redirect('account')

@app.route("/account")
def index():
    if current_user.is_authenticated:
        updateCalendars()
        return (flask.render_template('account.html',
            username = current_user.name, email = current_user.email, profile_img=current_user.profile_pic
            )
        )
    else:
        return flask.render_template('login.html')

def get_google_provider_cfg():
    return requests.get(GOOGLE_DISCOVERY_URL).json()

class Calendar:
    def __init__(self, name, toggle='False', color="#000000"):
        self.name = name
        self.color = color
        self.toggle=toggle
def calendarsFromDb():
    calendars = dbCalendar.getCalendars(current_user.id)
    pyCalendars = []
    for calendar in calendars:
        name = calendar[2]
        calId = calendar[1]
        toggle = calendar[3]
        color = calendar[4]

        pyCalendars.append(Calendar(name, toggle, color))

    return pyCalendars


@app.route("/calendar")
@login_required
def calendar():
    calendars = calendarsFromDb()
    return flask.render_template('calendar.html', calendars=calendars)

def getCalendarJson():
    if 'credentials' not in flask.session:
        return flask.redirect('login/google')

    # Load credentials from the session.
    credentials = google.oauth2.credentials.Credentials(
      **flask.session['credentials'])
    todaysCal = caltojson.generateJsonFromCalendarEntries(credentials)

    with open('./userinfo/' + current_user.id + '/calendarevents.json', 'w') as outfile:
        json.dump(todaysCal, outfile)

    return todaysCal


def updateCalendars():
    if 'credentials' not in flask.session:
        return flask.redirect('login/google')

  # Load credentials from the session.
    credentials = google.oauth2.credentials.Credentials(
        **flask.session['credentials'])

  
    calendars = caltojson.getCalendarList(credentials)

    for calendar in calendars:
        if dbCalendar.getCalendar(current_user.id, calendar.calendarId) == None:
            dbCalendar.create(current_user.id, calendar.calendarId, calendar.summary, calendar.color)

    print("updated Calendars")

    # Save credentials back to session in case access token was refreshed.
    # ACTION ITEM: In a production app, you likely want to save these
    #              credentials in a persistent database instead.
    flask.session['credentials'] = credentials_to_dict(credentials)


@app.route("/login/google")
def login():

    '''
    # Find out what URL to hit for Google login
    google_provider_cfg = get_google_provider_cfg()
    authorization_endpoint = google_provider_cfg["authorization_endpoint"]

    # Use library to construct the request for Google login and provide
    # scopes that let you retrieve user's profile from Google
    request_uri = client.prepare_request_uri(
        authorization_endpoint,
        redirect_uri=request.base_url + "/callback",
        scope=["openid", "email", "profile", "https://www.googleapis.com/auth/calendar.readonly"],
    )
    return redirect(request_uri)
    '''

    # Create flow instance to manage the OAuth 2.0 Authorization Grant Flow steps.
    flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
        CLIENT_SECRETS_FILE, scopes=SCOPES)
    # The URI created here must exactly match one of the authorized redirect URIs
    # for the OAuth 2.0 client, which you configured in the API Console. If this
    # value doesn't match an authorized URI, you will get a 'redirect_uri_mismatch'
    # error.
    flow.redirect_uri = request.base_url + "/callback"
    authorization_url, state = flow.authorization_url(
        # Enable offline access so that you can refresh an access token without
        # re-prompting the user for permission. Recommended for web server apps.
        access_type='offline',
        # Enable incremental authorization. Recommended as a best practice.
        include_granted_scopes='true')

    # Store the state so the callback can verify the auth server response.
    flask.session['state'] = state

    return flask.redirect(authorization_url)

@app.route("/login/google/callback")
def callback():
    # Specify the state when creating the flow in the callback so that it can
    # verified in the authorization server response.
    state = flask.session['state']

    flow = google_auth_oauthlib.flow.Flow.from_client_secrets_file(
        CLIENT_SECRETS_FILE, scopes=SCOPES, state=state)
    flow.redirect_uri = request.base_url

    # Use the authorization server's response to fetch the OAuth 2.0 tokens.
    authorization_response = flask.request.url
    flow.fetch_token(authorization_response=authorization_response)

    # Store credentials in the session.
    # ACTION ITEM: In a production app, you likely want to save these
    #              credentials in a persistent database instead.
    credentials = flow.credentials
    flask.session['credentials'] = credentials_to_dict(credentials)

    session = flow.authorized_session()

    userinfo = session.get('https://www.googleapis.com/userinfo/v2/me').json()

    # Create a user in your db with the information provided
    # by Google
    user = User(
        id_=userinfo['id'], 
        name=userinfo['name'], 
        email=userinfo['email'], 
        profile_pic=userinfo['picture']
    )

    # Doesn't exist? Add it to the database.
    if not User.get(user.id):
        User.create(user.id, user.name, user.email, user.profile_pic)

    # Begin user session by logging the user in
    login_user(user)
    return flask.redirect(flask.url_for('index'))

@app.route("/logout")
@login_required
def logout():
    logout_user()
    return redirect(url_for("index"))

def credentials_to_dict(credentials):
  return {'token': credentials.token,
          'refresh_token': credentials.refresh_token,
          'token_uri': credentials.token_uri,
          'client_id': credentials.client_id,
          'client_secret': credentials.client_secret,
          'scopes': credentials.scopes}


@app.route("/userinfo/<path:user>/calendarevents.json")
def downloader(user):
    print(user)
    path = "/home/raphael/dev/website_ws/website/userinfo/" + user
    return flask.send_from_directory(path, "calendarevents.json")

# POST

@app.route('/calendar', methods = ['POST', 'DELETE'])
@login_required
def user():
    if request.method == 'POST':
        calName = request.json.get('calendar_id')
        color = request.json.get('color')
        toggle = request.json.get('toggle')
        
        if color != None:
            dbCalendar.updateCalendar(current_user.id, calName, color=color)
        if toggle != None:
            dbCalendar.updateCalendar(current_user.id, calName, toggle=toggle)
        # toggle specific calendar of user
    elif request.method == 'DELETE':
        # do nothing
        return 'NONE'
    else:
        # POST Error 405
        print("405")

    return 'OK'

if __name__ == "__main__":
    context = ('certificate/xip.io.crt', 'certificate/xip.io.key')#certificate and key files
    app.run('0.0.0.0', 1234, ssl_context=context, debug=True)