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from flask import Flask, request, jsonify, render_template
from flask_cors import CORS
import sqlite3
import uuid
import time
import base64
import os
from dotenv import load_dotenv
from captcha import generate_captcha_image
load_dotenv()
app = Flask(__name__)
CORS(app)
DB_FILE = os.getenv("DB_FILE", "captchas.db")
CAPTCHA_DIR = os.getenv("CAPTCHA_DIR", "data/captcha_data")
FONT_PATH = os.getenv("FONT_PATH", "captcha.ttf")
EXPIRY_SECONDS = int(os.getenv("CAPTCHA_EXPIRY_SECONDS", "90"))
def init_db():
with sqlite3.connect(DB_FILE) as conn:
conn.execute('''
CREATE TABLE IF NOT EXISTS captchas (
token TEXT PRIMARY KEY,
answers TEXT,
expires_at REAL
)
''')
init_db()
@app.route('/')
def index():
return render_template("index.html")
@app.route('/generate', methods=['GET', 'POST'])
def generate():
try:
positions, blob = generate_captcha_image(
captcha_dir=CAPTCHA_DIR,
font_path=FONT_PATH
)
except Exception as e:
return jsonify({"error": str(e)}), 500
token = str(uuid.uuid4())
answers_str = ",".join(map(str, sorted(positions)))
expires_at = time.time() + EXPIRY_SECONDS
with sqlite3.connect(DB_FILE) as conn:
conn.execute('INSERT INTO captchas (token, answers, expires_at) VALUES (?, ?, ?)',
(token, answers_str, expires_at))
b64_img = base64.b64encode(blob).decode('utf-8')
return jsonify({
"token": token,
"image": f"data:image/jpeg;base64,{b64_img}",
"expires_in": EXPIRY_SECONDS
})
@app.route('/verify', methods=['POST'])
def verify():
data = request.json
if not data or 'token' not in data or 'answers' not in data:
return jsonify({"error": "Missing token or answers"}), 400
token = data['token']
user_answers = data['answers']
if not isinstance(user_answers, list):
return jsonify({"error": "answers must be a list of integers"}), 400
with sqlite3.connect(DB_FILE) as conn:
cursor = conn.cursor()
conn.execute('pragma journal_mode=wal')
cursor.execute('SELECT answers, expires_at FROM captchas WHERE token = ?', (token,))
row = cursor.fetchone()
if not row:
return jsonify({"error": "Invalid token"}), 404
answers_str, expires_at = row
cursor.execute('DELETE FROM captchas WHERE token = ?', (token,))
if time.time() > expires_at:
return jsonify({"error": "Captcha expired"}), 400
correct_answers = [int(x) for x in answers_str.split(',')]
user_answers_sorted = sorted([int(x) for x in user_answers])
if correct_answers == user_answers_sorted:
return jsonify({"success": True})
else:
return jsonify({"success": False, "error": "Incorrect answers"})
if __name__ == '__main__':
app.run(debug=True, port=int(os.getenv("PORT", 5000)))
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