band-aid fix for frozen session issue on signup (#50)

through some reason or another, people are somehow getting cookies that aren't prepended with a dot.

this is a problem because both sessions at, as best as I can tell, mix so it tries to read from a different cookie than we write to. this essentially "freezes" the session in place. users are unable to login, logout, signup, toggle poor mode, toggle NSFW, etc.

~~this attempts to delete bad session cookies (i.e. cookies with a domain that don't start with a dot).~~

~~we don't do this on "dotless" domains (and by extension localhost) because browser support for setting cookies on FQDNs that only have one dot has tenuous support among browsers anyway).~~

~~this *may* log some people out, but... their days of being able to do stuff on the site were numbered anyway.~~

**edit: as amazing as this thought was, browsers just wipe the entire cookies completely and there's no way to specifically target dotless cookies. for an issue that affects a few users, better to just tell them to clear their cookies. if *this* doesn't work, delete service-worker.js and be done with the whole service worker crap. forever. permanently. this PR also includes some QOL improvements.**

Co-authored-by: justcool393 <justcool393@gmail.com>
Reviewed-on: #50
Co-authored-by: justcool393 <justcool393@noreply.fsdfsd.net>
Co-committed-by: justcool393 <justcool393@noreply.fsdfsd.net>

files/__main__.py

@@ -25,16 +25,25 @@ app.jinja_env.auto_reload = True
 app.jinja_env.add_extension('jinja2.ext.do')
 faulthandler.enable()
 
+def _startup_check():
+	'''
+	Performs some sanity checks on startup to make sure we aren't attempting
+	to startup with obviously invalid values that won't work anyway
+	'''
+	if not SITE: raise TypeError("SITE environment variable must exist and not be None")
+	if SITE.startswith('.'): raise ValueError("Domain must not start with a dot")
+
 app.config['SERVER_NAME'] = SITE
 app.config['SECRET_KEY'] = environ.get('SECRET_KEY').strip()
 app.config['SEND_FILE_MAX_AGE_DEFAULT'] = 3153600
+_startup_check()
 if not IS_LOCALHOST:
-	app.config['SESSION_COOKIE_DOMAIN'] = f'.{SITE}'
 	app.config["SESSION_COOKIE_SECURE"] = True
+
 app.config["SESSION_COOKIE_NAME"] = "session_" + environ.get("SITE_NAME").strip().lower()
 app.config['MAX_CONTENT_LENGTH'] = 100 * 1024 * 1024
 app.config["SESSION_COOKIE_SAMESITE"] = "Lax"
-app.config["PERMANENT_SESSION_LIFETIME"] = 60 * 60 * 24 * 365
+app.config["PERMANENT_SESSION_LIFETIME"] = SESSION_LIFETIME
 app.config['SESSION_REFRESH_EACH_REQUEST'] = False
 
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

files/helpers/const.py

@@ -68,6 +68,8 @@ REDDIT_NOTIFS_CACHE_KEY = "reddit_notifications"
 MARSEYS_CACHE_KEY = "marseys"
 EMOJIS_CACHE_KEY = "emojis"
 
+SESSION_LIFETIME = 60 * 60 * 24 * 365
+
 CASINO_RELEASE_DAY = 1662825600
 
 if SITE_NAME == 'rDrama': patron = 'Paypig'

files/routes/allroutes.py

@@ -14,6 +14,9 @@ def session_init():
 @app.before_request
 def before_request():
 	g.desires_auth = False
+	if not IS_LOCALHOST:
+		app.config["COOKIE_DOMAIN"] = f".{request.host}"
+		app.config["SESSION_COOKIE_DOMAIN"] = app.config["COOKIE_DOMAIN"]
 	if SITE == 'marsey.world' and request.path != '/kofi':
 		abort(404)
 
@@ -50,25 +53,43 @@ def before_request():
 	limiter.check()
 	g.db = db_session()
 
-
 @app.after_request
-def after_request(response):
+def after_request(response:Response):
 	if response.status_code < 400:
-		if CLOUDFLARE_AVAILABLE and CLOUDFLARE_COOKIE_VALUE and g.desires_auth:
-			logged_in = bool(getattr(g, 'v', None))
-			response.set_cookie("lo", CLOUDFLARE_COOKIE_VALUE if logged_in else '', 
-								max_age=60*60*24*365 if logged_in else 1, samesite="Lax")
-		if getattr(g, 'db', None):
-			g.db.commit()
-			g.db.close()
-			del g.db
+		_set_cloudflare_cookie(response)
+		_commit_and_close_db()
 	return response
 
 
 @app.teardown_appcontext
 def teardown_request(error):
-	if getattr(g, 'db', None):
-		g.db.rollback()
-		g.db.close()
-		del g.db
+	_rollback_and_close_db()
 	stdout.flush()
+
+def _set_cloudflare_cookie(response:Response) -> None:
+	'''
+	Sets a cookie that can be used by an upstream DDoS protection and caching provider
+	'''
+	if not g.desires_auth: return
+	if not CLOUDFLARE_AVAILABLE or not CLOUDFLARE_COOKIE_VALUE: return
+	logged_in = bool(getattr(g, 'v', None))
+	if not logged_in and request.cookies.get("lo"):
+		response.delete_cookie("lo", domain=app.config["COOKIE_DOMAIN"], samesite="Lax")
+	elif logged_in and not request.cookies.get("lo"):
+		response.set_cookie("lo", CLOUDFLARE_COOKIE_VALUE if logged_in else '', 
+							max_age=SESSION_LIFETIME, samesite="Lax",
+							domain=app.config["COOKIE_DOMAIN"])
+
+def _commit_and_close_db() -> bool:
+	if not getattr(g, 'db', None): return False
+	g.db.commit()
+	g.db.close()
+	del g.db
+	return True
+
+def _rollback_and_close_db() -> bool:
+	if not getattr(g, 'db', None): return False
+	g.db.rollback()
+	g.db.close()
+	del g.db
+	return True

files/routes/login.py

@@ -205,8 +205,20 @@ def sign_up_post(v:Optional[User]):
 	form_timestamp = request.values.get("now", '0')
 	form_formkey = request.values.get("formkey", "none")
 
+	def signup_error(error, clear=False):
+		args = {"error": error}
+		if request.values.get("referred_by"):
+			user = get_account(request.values.get("referred_by"), include_shadowbanned=False)
+			if user: args["ref"] = user.username
+		resp = make_response(redirect(f"/signup?{urlencode(args)}"))
+		if clear:
+			session.clear()
+			resp.delete_cookie(app.config["SESSION_COOKIE_NAME"], httponly=True, secure=True, samesite="Lax")
+		return resp
+
 	submitted_token = session.get("signup_token", "")
-	if not submitted_token: abort(400)
+	if not submitted_token:
+		return signup_error(f"An error occurred while attempting to signup. If you get this repeatedly, please make sure cookies are enabled.", clear=True)
 
 	correct_formkey_hashstr = form_timestamp + submitted_token + g.agent
 	correct_formkey = hmac.new(key=bytes(SECRET_KEY, "utf-16"),
@@ -219,15 +231,6 @@ def sign_up_post(v:Optional[User]):
 	if not username: abort(400)
 	username = username.strip()
 
-	def signup_error(error):
-
-		args = {"error": error}
-		if request.values.get("referred_by"):
-			user = get_account(request.values.get("referred_by"), include_shadowbanned=False)
-			if user: args["ref"] = user.username
-
-		return redirect(f"/signup?{urlencode(args)}")
-
 	if now - int(form_timestamp) < 5:
 		return signup_error("There was a problem. Please try again.")
 

files/templates/login/authforms.html

@@ -16,14 +16,11 @@
 										<h2>{% block authtitle %}{% endblock %}</h2>
 										<p class="text-muted mb-md-5">{% block authtext %}{% endblock %}</p>
 			{% if error %}
-				<div class="alert alert-danger alert-dismissible fade show d-flex my-3" role="alert">
+				<div class="alert alert-danger fade show d-flex my-3" role="alert">
 													<i class="fas fa-exclamation-circle my-auto"></i>
 													<span>
 													{{error}}
 													</span>
-													<button type="button" class="close" data-bs-dismiss="alert" aria-label="Close">
-														<span aria-hidden="true"><i class="far fa-times"></i></span>
-												</button>
 								</div>
 			{% endif %}
 			{% if msg %}

files/templates/login/sign_up.html

@@ -58,11 +58,8 @@
 	</p>
 	<hr>
 	{% endif %}
-
 	<form action="/signup" method="post" class="mt-md-3" id="signup">
 
-	{% if error %}<div class="text-danger mb-2">{{error}}</div>{% endif %}
-
 	<input type="hidden" name="formkey" value="{{formkey}}">
 	<input type="hidden" name="now" value="{{now}}">
 	{% if redirect %}<input type="hidden" name="redirect" value="{{redirect}}">{% endif %}