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main.py
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#!/usr/bin/env python3
from flask import Flask, render_template, redirect, request
import requests
from typing import List
from datetime import datetime
import os
import json
END_URL = os.getenv('END_URL')
COEFFICIENTS_AND_MOD = json.loads(os.getenv('COEFFICIENTS_AND_MOD')) # For example, [3, 5, 23] represents the function f(x)=3x+5 mod 23
DOMAIN = os.getenv('DOMAIN')
DAYS_TO_ALLOW = os.getenv('DAYS_TO_ALLOW') # How many days to GET endpoint until death code functions
if DAYS_TO_ALLOW:
DAYS_TO_ALLOW = int(DAYS_TO_ALLOW)
# DAYS_TO_ALLOW = 7
ALIVE_PATH = os.getenv('ALIVE_PATH') # Path to deny allowing attempts immediately and start the countdown (optional)
# ALIVE_PATH = "i-am-alive"
DEAD_PATH = os.getenv('DEAD_PATH') # Path to start allowing attemps immediately (optional)
# DEAD_PATH = "i-am-dead"
LAST_ENDPOINT_GET: datetime = None
app = Flask(__name__)
@app.route("/", methods=["GET", "POST"])
def index():
global POLYNOMIAL, LAST_ENDPOINT_GET, DAYS_TO_ALLOW
try:
if request.method == "POST":
if ALIVE_PATH and DAYS_TO_ALLOW and LAST_ENDPOINT_GET and (datetime.today() - LAST_ENDPOINT_GET).days < DAYS_TO_ALLOW:
return render_template("message.html", message="Andrew is still alive. Try again another time")
captcha_id = request.form.get('captcha-id')
captcha_solution = request.form.get('captcha-solution')
v = captcha_validate(captcha_id, captcha_solution)
if not v[0]:
return render_template('message.html', message = "Failed captcha", attempts_left = v[1])
try:
coords = []
for key in request.form:
if 'x' == key[0]:
coords.append(Coordinate(int(request.form[key]), int(request.form['y' + key[1]])))
if POLYNOMIAL.valid_combination(coords):
return render_template("congrats.html", polynomial=POLYNOMIAL, domain=DOMAIN)
return render_template("message.html", message="Those points weren't valid", attempts_left = v[1])
except Exception as e:
print(e)
return render_template("message.html", message="Invalid data")
captcha = captcha_get(ttl = 300)
return render_template("index.html", polynomial = POLYNOMIAL, domain=DOMAIN, captcha_id = captcha[0], captcha_png = captcha[1])
except Exception as e:
print(e)
return render_template('message.html', message="Error ocurred")
@app.route("/<attempt_num>", methods=["GET", "POST"])
def attempt(attempt_num):
global POLYNOMIAL, LAST_ENDPOINT_GET, DAYS_TO_ALLOW
try:
attempt_num = int(attempt_num)
if request.method == "POST":
captcha_id = request.form.get('captcha-id')
captcha_solution = request.form.get('captcha-solution')
v = captcha_validate(captcha_id, captcha_solution)
if v[0]:
if ALIVE_PATH and LAST_ENDPOINT_GET and (datetime.today() - LAST_ENDPOINT_GET).days < DAYS_TO_ALLOW:
return render_template("message.html", message="Andrew is still alive. Try again another time")
num = int(attempt_num)
if num == POLYNOMIAL.x_zero_point:
return redirect(END_URL, code=302)
return render_template('message.html', message="Incorrect guess for f(0)", attempts_left = v[1])
return render_template('message.html', message="Failed captcha", attempts_left = v[1])
captcha = captcha_get(ttl = 30, difficulty="hard")
return render_template('attempt.html', captcha_id = captcha[0], captcha_png = captcha[1])
except ValueError as e:
print(e)
return render_template('message.html', message="URL path must be an integer")
except Exception as e:
print(e)
return render_template('message.html', message="Error ocurred")
if ALIVE_PATH and DAYS_TO_ALLOW:
@app.route("/" + ALIVE_PATH, methods=["GET"])
def am_alive():
global LAST_ENDPOINT_GET
LAST_ENDPOINT_GET = datetime.today()
return "OK"
if DEAD_PATH:
@app.route("/" + DEAD_PATH, methods=["GET"])
def am_dead():
global LAST_ENDPOINT_GET
LAST_ENDPOINT_GET = None
return "OK"
def captcha_validate(captcha_id: str, captcha_solution: str) -> List:
""" Validates a captcha and returns [success, trials_left] """
response = requests.post(f"http://rust-captcha:8000/solution/{captcha_id}/{captcha_solution}", headers={'X-Client-ID': 'Death Code'}).json()
if response["error_code"] != 0:
print(f"http://rust-captcha:8000/solution/{captcha_id}/{captcha_solution}")
raise Exception(response)
if response["result"]["solution"] == "accepted":
return [True, 0]
return [False, response["result"]["trials_left"]]
def captcha_get(max_tries: int = 3, ttl: int = 120, difficulty: str = "medium") -> List[str]:
""" Creates a captcha and returns [id, base64 encoded png] """
response = requests.post(f"http://rust-captcha:8000/new/{difficulty}/{max_tries}/{ttl}", headers={'X-Client-ID': 'Death Code'}).json()
if response["error_code"] != 0:
raise Exception(response)
return [response["result"]["id"], response["result"]["png"]]
class Coordinate:
def __init__(self, x: int, y: int):
self.x = x
self.y = y
def __repr__(self) -> str:
return "({}, {})".format(self.x, self.y)
def equals(self, coord):
""" Returns whether this coordinate is equal to the other """
return self.x == coord.x and self.y == coord.y
class Polynomial:
def __init__(self, coefficients: List, modulo: int):
while (coefficients[0] == 0):
coefficients = coefficients[1:]
self.degree = len(coefficients) - 1
self.coefficients = coefficients
self.modulo = modulo
self.x_zero_point = coefficients[-1] % modulo
def __repr__(self):
i = 0
s = "y="
exponent = self.degree
while exponent > 1:
if s != "y=":
s += "+"
s += str(self.coefficients[i]) + "x^" + str(exponent)
exponent -= 1
i += 1
if i != len(self.coefficients):
if s != "y=":
s += "+"
s += str(self.coefficients[i]) + "x"
i += 1
if i != len(self.coefficients):
if s != "y=":
s += "+"
s += str(self.coefficients[-1])
return s + " mod " + str(self.modulo)
def valid_combination(self, coordinates: List[Coordinate]) -> bool:
""" Returns whether there are enough valid coordinates in `coordinates` to extract this polyomial """
count = 0
seen_coords = []
for coord in coordinates:
if self.valid_coord(coord) and all([not coord.equals(coordinate) for coordinate in seen_coords]):
count += 1
seen_coords.append(coord)
return count >= self.degree + 1
def valid_coord(self, coord: Coordinate) -> bool:
""" Returns whether `coord` is a valid coordinate for this polynomial """
exponent = self.degree
coefficients = self.coefficients
value = 0
i = 0
while exponent >= 0:
value += coefficients[i] * pow(coord.x, exponent)
exponent -= 1
i += 1
return value % self.modulo == coord.y
POLYNOMIAL = Polynomial(COEFFICIENTS_AND_MOD[:-1], COEFFICIENTS_AND_MOD[-1])
if __name__ == "__main__":
app.run(host="0.0.0.0", debug=True, port=8888)