Prevent permabanned users from replying to DMs.

Permabanning already prevents users from initiating new DMs, and we
complete this by preventing replying to existing DM chains.
New modmails may still be initiated, and existing modmails may still
be replied to.

files/classes/user.py

@@ -720,6 +720,11 @@ class User(Base):
 	def is_suspended(self):
 		return (self.is_banned and (self.unban_utc == 0 or self.unban_utc > time.time()))
 
+	@property
+	@lazy
+	def is_suspended_permanently(self):
+		return (self.is_banned and self.unban_utc == 0)
+
 	@property
 	@lazy
 	def has_shadowbanned_alts(self):

files/helpers/wrappers.py

@@ -138,7 +138,7 @@ def is_not_permabanned(f):
 		
 		check_ban_evade(v)
 
-		if v.is_banned and v.unban_utc == 0:
+		if v.is_suspended_permanently:
 			return {"error": "Internal server error"}, 500
 
 		return make_response(f(*args, v=v, **kwargs))

files/routes/users.py

@@ -722,9 +722,7 @@ def message2(v, username):
 @limiter.limit("1/second;6/minute;50/hour;200/day", key_func=lambda:f'{SITE}-{session.get("lo_user")}')
 @auth_required
 def messagereply(v):
-
 	body = request.values.get("body", "").strip().replace('‎','')
-
 	body = body.replace('\r\n', '\n')[:10000]
 
 	if not body and not request.files.get("file"): return {"error": "Message is empty!"}
@@ -735,6 +733,9 @@ def messagereply(v):
 	parent = get_comment(id, v=v)
 	user_id = parent.author.id
 
+	if v.is_suspended_permanently and parent.sentto != 2:
+		return {"error": "You are permabanned and may not reply to messages."}
+
 	if parent.sentto == 2: user_id = None
 	elif v.id == user_id: user_id = parent.sentto