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app.py
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app.py
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from flask import Flask, render_template, request, jsonify, redirect
from pymongo import MongoClient
from dotenv import load_dotenv
import os
import random
import string
load_dotenv()
app = Flask(__name__)
# Use the connection string from the .env file
client = MongoClient(os.getenv('MONGO_PATH'), int(os.getenv('MONGO_PORT')))
#For Mongo atlas
#mongo_uri = os.getenv('MONGO_URI')
#client = MongoClient(mongo_uri)
# MongoDB Database Access
database = client.ShortUrlDatabase
ShortUrlDatabase = database.URLData
# Functions
def generate_random_string(length=5):
'''
This function gives a combination of lowercase and uppercase letters of k length
'''
print('generating a random keyword')
letters = string.ascii_letters
random_string = ''.join(random.choices(letters, k=length))
print('keyword generated: '+str(random_string))
return random_string
def is_keyword_present(keyword):
'''
Function to check if the current keyword is present in the DB or not
'''
print('Fetching if keyword is present in DB: '+str(keyword))
present = 0
for item in ShortUrlDatabase.find():
if (item['keyword'] == keyword):
print('keyword present in DB: '+str(keyword))
present = 1
print('keyword not present in DB: '+str(keyword))
return present
# Routes
@app.route('/')
def home():
'''
Index page for URL Shortener (Project OSUS (Open Source URL Shortener))
'''
print('Home Page API Called, rendering template')
return render_template('index.html')
@app.route('/documentation')
def documentation():
return render_template('documentation.html')
@app.route('/getURL')
def currentURl():
'''
This function will return the current working URL, something like 'http://127.0.0.1:5000/'
'''
print('getURL API Called')
current_url = request.host_url
print('Current URL: '+str(current_url))
return f'The app is running on {current_url}'
@app.route('/shorten', methods=['POST'])
def shortenAPI():
'''
This method will shorten the link and give the short URL
'''
print('URL Shorten Called')
print('Mongo Connection: '+str(os.getenv('MONGO_PATH')[:6]))
if request.method == 'POST':
longUrl = request.json.get("longUrl")
keyword = request.json.get("keyword")
# Logs
print('Long URL Received: ' + str(longUrl))
print('Keyword Received: ' + str(keyword))
if keyword == '':
keyword = generate_random_string()
print('New keyword generated: ' + str(keyword))
# Prepare the data to insert
url_data = {
'keyword': keyword,
'url': longUrl,
'clicks': 0
}
# Check if the keyword is already present
if is_keyword_present(keyword) == 0:
print('Keyword is not present, inserting into DB')
print('Data to be inserted:', url_data) # Print the data being inserted
ShortUrlDatabase.insert_one(url_data)
print('DB insert successful')
else:
print('Keyword is present, throwing error')
return jsonify({'error': 'The keyword already exists. Please choose a different one.'}), 400
if request.method == 'GET':
print('Called get method on shorten end-point, throwing error')
return "GET Method Not Allowed On This End Point"
return jsonify({'shortUrl': str(request.host_url) + str(keyword)})
@app.route('/analytics', methods=['GET', 'POST'])
def analyticsAPI():
'''
This /analytics route consists of both GET and POST requests.
- GET: Returns the analytics.html file.
- POST: Returns the total number of clicks (visits) for the specific shortened URL from the DB.
'''
if request.method == 'GET':
# Serve the analytics.html template for GET requests
print('Analytics page requested.')
return render_template('analytics.html')
if request.method == 'POST':
keyword = request.json.get("keyword")
print('Keyword Received: ' + str(keyword))
# Check if the keyword exists in the database
url_data = ShortUrlDatabase.find_one({'keyword': keyword})
if url_data:
# Return the current clicks count without incrementing
clicks_count = url_data['clicks']
print(f'Keyword: {keyword}, Clicks Count: {clicks_count}')
return jsonify({'clicks': clicks_count}), 200
else:
print('Keyword not found in DB')
return jsonify({'error': 'Keyword not found.'}), 404
@app.route('/heartbeat')
def hearBeat():
'''
This end point should do all the checks/ add dummy data to DB if required and respond saying the website is UP
'''
print('heartbeat API called')
return 'The website is up'
@app.route('/<keyword>')
def reroute(keyword):
print('Clicked on shortURL')
link_status = 0
redirection = None # Initialize redirection variable
print('Finding the URL Keyword')
print('Mongo Connection: ' + str(os.getenv('MONGO_PATH')[:6]))
# Find the URL associated with the keyword
for item in ShortUrlDatabase.find():
if item['keyword'] == keyword:
redirection = item['url']
# Increment the clicks count
ShortUrlDatabase.update_one(
{'keyword': keyword},
{'$inc': {'clicks': 1}} # Increment clicks by 1
)
print('Short URL <> Long URL mapping found in DB')
link_status = 1
break # Break out of the loop once the keyword is found
if link_status == 0:
print('Link Not Found in DB')
return "Link Not Found"
print('Redirecting to long URL: ' + str(redirection))
return redirect(redirection, code=302)
if __name__ == '__main__':
app.run(debug=True, port=5000)