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lnworker._check_invoice: add sanity check

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SomberNight 2020-06-23 15:38:06 +02:00
parent d31883a2ea
commit 1495040f45
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1 changed files with 4 additions and 1 deletions
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5
electrum/lnworker.py
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@ -1002,7 +1002,10 @@ class LNWallet(LNWorker):
addr = lndecode(invoice, expected_hrp=constants.net.SEGWIT_HRP) addr = lndecode(invoice, expected_hrp=constants.net.SEGWIT_HRP)
if addr.is_expired(): if addr.is_expired():
raise InvoiceError(_("This invoice has expired")) raise InvoiceError(_("This invoice has expired"))
if amount_msat: if amount_msat: # replace amt in invoice. main usecase is paying zero amt invoices
existing_amt_msat = addr.get_amount_msat()
if existing_amt_msat and amount_msat < existing_amt_msat:
raise Exception("cannot pay lower amt than what is originally in LN invoice")
addr.amount = Decimal(amount_msat) / COIN / 1000 addr.amount = Decimal(amount_msat) / COIN / 1000
if addr.amount is None: if addr.amount is None:
raise InvoiceError(_("Missing amount")) raise InvoiceError(_("Missing amount"))