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fix: return 410 ChannelClosed for zero-deposit settled channels #243

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fix: return 410 ChannelClosed for zero-deposit settled channels #243

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9 changes: 9 additions & 0 deletions src/tempo/server/Session.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -456,6 +456,15 @@ async function verifyAndAcceptVoucher(parameters: {
if (onChain.closeRequestedAt !== 0n) {
throw new ChannelClosedError({ reason: 'channel has a pending close request' })
}
// Treat a zero deposit on an existing channel as settled/closed.
// During settlement the escrow contract may zero the deposit before
// setting the finalized flag, creating a brief window where
// finalized=false but deposit=0. Without this guard the voucher
// check below would return a 402 (AmountExceedsDepositError) instead
// of the correct 410 (ChannelClosedError).
if (onChain.deposit === 0n && onChain.payer !== '0x0000000000000000000000000000000000000000') {
throw new ChannelClosedError({ reason: 'channel deposit is zero (settled)' })
}

if (voucher.cumulativeAmount <= onChain.settled) {
throw new VerificationFailedError({
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