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While there are many scheduling applications available, nothing beats the DIY (Do It Yourself) philosophy, as you will learn a lot while building a Scheduler from scratch. However, not everyone is a web developer. To overcome this, we’re going to use Taipy, a full-stack Python framework that will make the entire process a pleasant experience.
What are we going to talk about?
- What does our Taipy scheduler application look like
- Installing the requirements
- Creating the Taipy scheduler application
- Running the Taipy scheduler application
- Checking the generated event
What does our Taipy scheduler application look like
When we first launch the application, it will request us to log in using hosted authentication:
Here, while we’re going to choose Gmail, we could choose any other provider:
We need to choose the account we want to use:
We need to choose the account one more time, for security reasons:
We will get a message saying that our application hasn’t been verified by Google, but that’s OK as we’re not using a production environment:
Here, we need to confirm that we’re giving Nylas access to our account, although keep in mind that we’re only requesting calendar scopes:
Once we are logged in, an availability check is going to be performed. This will include the logged user and the calendar owner. Simply, both calendars will be checked to determine common empty slots when a meeting can be scheduled.
And the bottom, we have a button to create the event, after selecting it from the list, and also a a button to close the session and go back to the main screen.
We can select a day and time, and then select the Setup Meeting button:
A confirmation will appear once we create the event, whether it fails or not:
The selected slot will be instantly taken from the list, as it is not available anymore:
Installing the requirements
While this is a Taipy application, we’re going to use Flask as well, as we need it to handle the hosted authentication. We’re going to install Pendulum as well to easily handle dates.
In a terminal window, type the following:
$ pip3 install taipy $ pip3 install -U Flask $ pip3 install pendulum $ pip3 install python-dotenv
Creating the Taipy scheduler application
We are going to create a folder called Scheduler_Taipy. Inside this folder, we are going to create two files, one called Scheduler.py and the other one Scheduler.css (Note that they need to have the same name but with different extensions):
# Import your dependencies
from dotenv import load_dotenv
import os
from nylas import Client # type: ignore
from taipy.gui import Gui, navigate, notify
import pendulum
from flask import Flask, redirect, session, request
import re
import time
from nylas.models.auth import URLForAuthenticationConfig
from nylas.models.availability import GetAvailabilityRequest
from nylas.models.auth import CodeExchangeRequest
flask_app = Flask(__name__)
# Global variables for the state
#email_address = ""
value = ""
schedules = {"available":''}
# Load your env variables
load_dotenv()
# Initialize an instance of the Nylas SDK using the client credentials
nylas = Client(
api_key = os.environ.get("V3_API_KEY")
)
root_md=""
page1_md="""
# Welcome to Blag's Scheduler
<|Nyla_Space.png|image|>
<|Google.png|image|on_action=on_button_action|>
"""
page2_md = """
### Available dates and times
<|{value}|selector|lov={schedules.get("available")}|>
<|Setup meeting|button|on_action=on_schedule_action|>
<|Log out|button|on_action=on_logout_action|>
"""
pages = {
"/": root_md,
"page1": page1_md,
"page2": page2_md
}
@flask_app.route("/login/nylas/authorized")
def authorized():
# Get the code generated by the hosted authentication
code = request.args.get("code")
# Exchange the code for a grant
exchangeRequest = CodeExchangeRequest({"redirect_uri": "http://localhost:5000/login/nylas/authorized",
"code": code,
"client_id": os.environ.get("V3_CLIENT")})
#print(exchangeRequest)
# Get the information from the grant
exchange = nylas.auth.exchange_code_for_token(exchangeRequest)
response, _ = nylas.grants.find(exchange.grant_id)
# Create a session
session.permanent = True
# Fill session details
session["email_address"] = response.email
session["grant_id"] = exchange.grant_id
# Call the login function to load availability
dummy = login(session.get("state"))
# Call the page to display availability
return redirect("http://localhost:5000/page2")
def login(state):
# Give some time for the grant to setup
time.sleep(3)
date_time = []
schedules["available"] = ""
# Get the availability for both email accounts
request_body = GetAvailabilityRequest(
participants = [
{
"email": os.environ.get("GRANT_ID"),
"calendar_ids": [
os.environ.get("GRANT_ID")
],
},
{
"email": session["email_address"],
"calendar_ids": [
session["email_address"]
],
},
],
duration_minutes = 60,
)
# Get today’s date
today = pendulum.now()
# Day of the week
dow = today.day_of_week
# Our working days goes from 10:00am to 5:00pm
# And we don't want days that already passed by
for x in range(dow, 6):
start_time = pendulum.local(today.year, today.month, today.day, today.hour, 0, 0).int_timestamp
end_time = pendulum.local(today.year, today.month, today.day, 17, 0, 0).int_timestamp
request_body["start_time"] = start_time
request_body["end_time"] = end_time
# Get the available spots
availability, _request_ids = nylas.calendars.get_availability(request_body)
# Add the following day
today = today.add(days=1)
# Find available times
for slot in availability.time_slots:
ts = pendulum.from_timestamp(slot.start_time, today.timezone.name).strftime("%m/%d/%Y at %H:%M")
te = pendulum.from_timestamp(slot.end_time ,today.timezone.name).strftime("%H:%M")
date_time.insert(len(date_time), ts + " to " + te)
# Here are all the available spots
schedules["available"] = date_time
return date_time
def on_button_action(state):
# Generate the hosted authentication page
session.pop("email_address", None)
config = URLForAuthenticationConfig({"client_id": os.environ.get("V3_CLIENT"),
"redirect_uri" : "http://localhost:5000/login/nylas/authorized",
"scope":["https://www.googleapis.com/auth/calendar.readonly"]})
url = nylas.auth.url_for_oauth2(config)
session["state"] = state
# And call it
navigate(state, url)
def on_schedule_action(state):
# Extract the dates from the selected slot
pattern = r"(\d{1,2}/\d{1,2}/\d{4}) at (\d{1,2}:\d{2}) to (\d{1,2}:\d{2})"
match = re.search(pattern, state.value)
date = match.group(1)
date_parts = date.split('/')
start_time = match.group(2)
start_time_parts = start_time.split(':')
end_time = match.group(3)
end_time_parts = end_time.split(':')
query_params = {"calendar_id": os.environ.get("GRANT_ID")}
# Define the events details
request_body = {
"when": {
"start_time": pendulum.local(int(date_parts[2]), int(date_parts[0]),
int(date_parts[1]), int(start_time_parts[0]), 0, 0).int_timestamp,
"end_time": pendulum.local(int(date_parts[2]), int(date_parts[0]),
int(date_parts[1]), int(end_time_parts[0]), 0, 0).int_timestamp,
},
"title": "Meeting with Blag",
"location": "Blag's Online Den",
"description": f"You're meeting with Blag on {date} from {start_time} to {end_time}",
"participants": [{
"email": session["email_address"],
}]
}
# Create the event
event = nylas.events.create(os.environ.get("GRANT_ID"),
query_params = query_params, request_body = request_body).data
# Display a message with the status of the event creation
if event.id:
date_time = login(state)
state.schedules["available"] = date_time
navigate(state, "page2")
notify(state, 'info', "The event was created successfully")
else:
notify(state, 'info', "There was an error creating the event")
def on_logout_action(state):
# We're logging out. Destroy the grant and clear all sessions
nylas.grants.destroy(session["grant_id"])
session.pop("email_address", None)
session.pop("grant_id", None)
navigate(state, "/")
Gui(pages=pages, flask=flask_app).run()
Next, we need to create the Scheduler.css file:
:root {
height: 200px;
display: flex;
align-items: center;
justify-content: center;
text-align: center;
}
This is just to put everything in the center of the screen.
Running the Taipy scheduler application
To run our application, we need to update our Nylas application. Head to the Hosted Authentication page on your dashboard, and click on Add a callback URI.
http://localhost:5000/login/nylas/authorized
Once that is done, we can type the following on the terminal window:
$ python3 Scheduler.py
Checking the generated event
As we selected a spot and generated a meeting, why don’t we look at it? We just need to go to our mailbox or our calendar to find it:
What’s next?
Do you have any comments or feedback? Please use our forums 😎
Want to fetch the repo? Here you go scheduler_taipy 🥳
Learn more about Calendars in our documentation.
Don’t miss the action, join our LiveStream Coding with Nylas!
