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Build out and document facets in python (#446)
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| The purpose of this project is to demonstrate selfie for the manual. | ||
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| Go to https://selfie.dev/py/facets for the tutorial. | ||
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| - First run `poetry install` | ||
| - You can run the app locally with `poetry run python app.py` | ||
| - You can run the tests with `poetry run pytest` |
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| # app.py | ||
| import base64 | ||
| import hashlib | ||
| import threading | ||
| import time | ||
| from datetime import datetime, timedelta | ||
| from functools import wraps | ||
| from random import Random | ||
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| from flask import ( | ||
| Flask, | ||
| jsonify, | ||
| make_response, | ||
| redirect, | ||
| render_template_string, | ||
| request, | ||
| ) | ||
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| random_0 = Random(0) | ||
| app = Flask(__name__) | ||
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| # In-memory database (replace with a real database in production) | ||
| database = {} | ||
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| # Email storage for development | ||
| email_storage = [] | ||
| email_lock = threading.Lock() | ||
| email_condition = threading.Condition(email_lock) | ||
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| class DevTime: | ||
| def __init__(self): | ||
| self.current_time = datetime(2000, 1, 1) | ||
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| def set_year(self, year): | ||
| self.current_time = datetime(year, 1, 1) | ||
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| def advance_24hrs(self): | ||
| self.current_time += timedelta(days=1) | ||
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| def now(self): | ||
| return self.current_time | ||
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| dev_time = DevTime() | ||
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| def repeatable_random(length): | ||
| # This is a simplified version, not as secure as Java's SecureRandom | ||
| return "".join( | ||
| random_0.choice( | ||
| "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" | ||
| ) | ||
| for _ in range(length) | ||
| ) | ||
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| def send_email(to_email, subject, html_content): | ||
| email = {"to": to_email, "subject": subject, "html_content": html_content} | ||
| with email_lock: | ||
| email_storage.append(email) | ||
| email_condition.notify_all() | ||
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| def sign_email(email): | ||
| terrible_security = "password" | ||
| return base64.urlsafe_b64encode( | ||
| hashlib.sha256(f"{email}{terrible_security}".encode()).digest() | ||
| ).decode() | ||
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| def auth_required(f): | ||
| @wraps(f) | ||
| def decorated_function(*args, **kwargs): | ||
| user = auth_user() | ||
| if user is None: | ||
| return redirect("/") | ||
| return f(user, *args, **kwargs) | ||
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| return decorated_function | ||
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| def auth_user(): | ||
| login_cookie = request.cookies.get("login") | ||
| if not login_cookie: | ||
| return None | ||
| email, signature = login_cookie.split("|") | ||
| if signature != sign_email(email): | ||
| return None | ||
| return {"email": email} | ||
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| @app.route("/") | ||
| def index(): | ||
| user = auth_user() | ||
| if user: | ||
| return render_template_string( | ||
| """ | ||
| <html><body> | ||
| <h1>Welcome back {{ username }}</h1> | ||
| </body></html>""", | ||
| username=user["email"], | ||
| ) | ||
| else: | ||
| return render_template_string( | ||
| """ | ||
| <html><body> | ||
| <h1>Please login</h1> | ||
| <form action="/login" method="post"> | ||
| <input type="text" name="email" placeholder="email"> | ||
| <input type="submit" value="login"> | ||
| </form> | ||
| </body></html>""" | ||
| ) | ||
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| @app.route("/login", methods=["POST"]) | ||
| def login(): | ||
| email = request.form["email"] | ||
| random_code = repeatable_random(7) | ||
| database[random_code] = email | ||
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| login_link = f"http://{request.host}/login-confirm/{random_code}" | ||
| send_email( | ||
| email, | ||
| "Login to example.com", | ||
| f'Click <a href="{login_link}">here</a> to login.', | ||
| ) | ||
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| return render_template_string( | ||
| """ | ||
| <html><body> | ||
| <h1>Email sent!</h1> | ||
| <p>Check your email for your login link.</p> | ||
| </body></html>""" | ||
| ) | ||
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| @app.route("/login-confirm/<code>") | ||
| def login_confirm(code): | ||
| email = database.pop(code, None) | ||
| if email is None: | ||
| return render_template_string( | ||
| """ | ||
| <html><body> | ||
| <h1>Login link expired.</h1> | ||
| <p>Sorry, <a href="/">try again</a>.</p> | ||
| </body></html>""" | ||
| ) | ||
| response = make_response(redirect("/")) | ||
| response.set_cookie("login", f"{email}|{sign_email(email)}") | ||
| return response | ||
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| @app.route("/email") | ||
| def email_list(): | ||
| messages = email_storage | ||
| html = "<h2>Messages</h2><ul>" | ||
| if not messages: | ||
| html += "<li>(none)</li>" | ||
| else: | ||
| for i, message in enumerate(messages, 1): | ||
| html += f'<li><a href="/email/message/{i}">{i}: {message["to"]} {message["subject"]}</a></li>' | ||
| html += "</ul>" | ||
| return html | ||
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| @app.route("/email/message/<int:idx>") | ||
| def email_message(idx): | ||
| idx -= 1 | ||
| if 0 <= idx < len(email_storage): | ||
| return email_storage[idx]["html_content"] | ||
| else: | ||
| return "No such message" | ||
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| def wait_for_incoming_email(timeout=1): | ||
| start_time = time.time() | ||
| with email_lock: | ||
| while len(email_storage) == 0: | ||
| remaining_time = timeout - (time.time() - start_time) | ||
| if remaining_time <= 0: | ||
| raise TimeoutError("Email wasn't sent within the specified timeout") | ||
| email_condition.wait(timeout=remaining_time) | ||
| return email_storage[-1] | ||
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| @app.route("/dev/time", methods=["POST"]) | ||
| def set_dev_time(): | ||
| json = request.json | ||
| assert json is not None | ||
| action = json.get("action") | ||
| if action == "set_year": | ||
| year = json.get("year") | ||
| dev_time.set_year(year) | ||
| elif action == "advance_24hrs": | ||
| dev_time.advance_24hrs() | ||
| return jsonify({"current_time": dev_time.now().isoformat()}) | ||
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| if __name__ == "__main__": | ||
| print("Opening selfie demo app at http://localhost:5000") | ||
| app.run(debug=True) |
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