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Fix IP Deduplication check behind proxy

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Turns out using `X-Forwarded-For` appends each proxy's IP. This leads
to being able to easily circumvent IP duplication checking especially
behind hosts like cloudflare that use different routes each time to
reach the destination server.
Now the IP is being split at all commas, as hosts are comma separated in
the header and uses the first IP it can get.
This commit is contained in:
Wolvan 2022-02-13 02:51:21 +01:00
parent 4788087a3e
commit c9ef07880a
1 changed files with 3 additions and 2 deletions
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5
src/backend.ts
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@ -94,8 +94,9 @@ export default async function init(router: Router, polls: Storage): Promise<void
}; };
if (poll.dupeCheckMode === "ip") { if (poll.dupeCheckMode === "ip") {
if (Array.isArray(poll.dupeData) && poll.dupeData.includes(ip as string)) return null; const dupeIP = ip.split(/, ?/).shift() || "";
if (Array.isArray(poll.dupeData)) poll.dupeData.push(ip as string); if (Array.isArray(poll.dupeData) && poll.dupeData.includes(dupeIP)) return null;
if (Array.isArray(poll.dupeData)) poll.dupeData.push(dupeIP);
} else if (poll.dupeCheckMode === "cookie") { } else if (poll.dupeCheckMode === "cookie") {
const cookie = cookies[poll.dupeData as string]; const cookie = cookies[poll.dupeData as string];
if (cookie) return null; if (cookie) return null;