url encoding with python #4

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shailaja wants to merge 1 commits from Services/part3 into main
2 changed files with 199 additions and 0 deletions

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app/main.py Normal file
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import os
from flask import Flask, render_template, request, redirect, abort, url_for, session
import requests
from datetime import datetime
from urllib.parse import urlencode
def get_env_variable(var_name):
value = os.environ.get(var_name)
if not value:
raise ValueError(f"Missing required environment variable: {var_name}")
return value
app = Flask(__name__)
# Read environment variables outside the route function
client_id = get_env_variable('CLIENT_ID')
client_secret = get_env_variable('CLIENT_SECRET')
redirect_uri = get_env_variable('REDIRECT_URI')
optional_scopes = get_env_variable('OPTIONAL_SCOPES')
database_url = get_env_variable('DATABASE_URL')
secret_key = get_env_variable('APP_SECRET_KEY')
# Set secret key to enable sessions
app.secret_key = secret_key
# https://www.inoreader.com/oauth2/auth
# Corrected URL for Inoreader OAuth
AUTH_URL = 'https://www.inoreader.com/oauth2/auth'
#defining constant
TOKEN_URL = 'https://www.inoreader.com/oauth2/token'
USER_INFO_URL = 'https://www.inoreader.com/reader/api/0/user-info'
@app.route('/')
def home():
if is_logged_in():
return main_menu()
else:
return generate_login_page()
def main_menu():
token_id = session.get('token_id')
token = get_token_from_database(token_id)
user_info = get_user_info(token['access_token'])
last_synced, next_sync = format_sync_times(token)
return render_template('home.html', user_login=user_info.get('userName'),
user_email=user_info.get('userEmail'),
readwise_api_key=token.get('readwise_api_key', ''),
last_synced=last_synced, next_sync=next_sync)
def generate_login_page():
session['csrf_protection_string'] = os.urandom(16).hex()
oauth_params = {
'client_id': client_id,
'redirect_uri': redirect_uri,
'response_type': 'code',
'scope': optional_scopes,
'state': session['csrf_protection_string']
}
oauth_url = f'{AUTH_URL}?{urlencode(oauth_params)}'
return render_template('login.html', oauth_url=oauth_url)
@app.route('/oauth-redirect')
def oauth_redirect():
auth_code = request.args.get('code')
csrf_token = request.args.get('state')
# Verify the CSRF protection string
if csrf_token != session.get('csrf_protection_string'):
abort(403, 'Invalid CSRF token. Please try again.')
# Exchange authorization code for access and refresh tokens using the Inoreader API
response = requests.post(
TOKEN_URL,
headers={'Accept': 'application/json'},
data={
'code': auth_code,
'redirect_uri': redirect_uri,
'client_id': client_id,
'client_secret': client_secret,
}
)
raise_for_status(response)
token = response.json()
# Fetch user information from Inoreader
user_info = requests.get(USER_INFO_URL, headers={
'Authorization': f'Bearer {token.get("access_token")}'
}).json()
# Save tokens for later use
token_id = save_or_update_token(user_info.get('userEmail'), token)
set_session_token_id(token_id)
return redirect(url_for('home'))
# logout
@app.route('/logout', methods=['POST'])
def logout():
token_id = session.get('token_id')
if not token_id:
return redirect(url_for('home'))
# remove token_id from session
session.pop('token_id', None)
# response = requests.put(f'{database_url}/token/{token_id}', headers={
# 'Content-Type': 'application/json'
# }, json={
# 'is_logged_in': False
# })
# response.raise_for_status()
return redirect(url_for('home'))
@app.route('/readwise', methods=['POST'])
def submit_readwise_api():
token_id = session.get('token_id')
if not token_id:
return redirect(url_for('home'))
response = requests.put(f'{database_url}/token/{token_id}', headers={
'Content-Type': 'application/json'
}, json={
'readwise_api_key': request.form.get('readwise_api_key')
})
raise_for_status(response)
return redirect(url_for('home'))
def is_logged_in():
token_id = session.get('token_id')
if not token_id:
return False
response = requests.get(f'{database_url}/token/{token_id}')
raise_for_status(response)
resp_json = response.json()
token = resp_json['token']
return token.get('active', False)
def save_or_update_token(email, access_token, refresh_token, expiration_seconds):
response = requests.get(f'{database_url}/token?email={email}')
raise_for_status(response)
if response.status_code == 200:
update_login(response.json()['token']['id'], access_token, refresh_token, expiration_seconds)
else:
add_login(email, access_token, refresh_token, expiration_seconds)
def add_login(email, access_token, refresh_token, expiration_seconds):
response = requests.post(
f'{database_url}/token',
headers={'Content-Type': 'application/json'},
json={
'email': email,
'access_token': access_token,
'refresh_token': refresh_token,
'expiration_seconds': expiration_seconds
}
)
raise_for_status(response)
return response.json().get('id')
def update_login(token_id, access_token, refresh_token, expiration_seconds):
response = requests.put(
f'{database_url}/token/{token_id}',
headers={'Content-Type': 'application/json'},
json={
'access_token': access_token,
'refresh_token': refresh_token,
'expiration_seconds': expiration_seconds
}
)
raise_for_status(response)
return token_id
def set_session_token_id(token_id):
session['token_id'] = token_id
def raise_for_status(response):
if response.status_code not in range(200, 300):
try:
msg = response.json().get('error', 'No error message provided')
except Exception:
msg = response.text
raise Exception(f'HTTPError: {response.status_code} - Message: {msg}')
if __name__ == '__main__':
app.run(host='0.0.0.0', debug=True, port=5000)

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app/requirements.txt Normal file
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Flask==3.0.1
requests==2.31.0