app.py

from flask import Flask, request, jsonify
import requests

app = Flask(__name__)

def extract_shorturl(short_url):
    try:
        # GET request to the short URL
        response = requests.get(short_url, allow_redirects=False)
        
        # All redirection links
        redirection_links = []

        # Follow redirections
        while 'Location' in response.headers:
            redirect_url = response.headers['Location']
            redirection_links.append(redirect_url)
            response = requests.get(redirect_url, allow_redirects=False)

        final_link = response.url
        redirection_links.append(final_link)
        
        return final_link, redirection_links

    except requests.exceptions.RequestException as e:
        return None, [f"Error fetching the URL: {e}"]

@app.route('/extract', methods=['GET'])
def extract():
    short_url = request.args.get('url')
    if not short_url:
        return jsonify({"error": "No URL provided"}), 400

    full_link, all_links = extract_shorturl(short_url)
    if full_link is None:
        return jsonify({"error": "Failed to expand the URL", "details": all_links}), 500

    return jsonify({
        "Original URL": short_url,
        "Full Link": full_link,
        "All Possible Redirections": all_links
    })

if __name__ == '__main__':
    app.run()