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Add support for paying to BOLT12 #549

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Add support for paying to BOLT12 #549

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ok300
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@ok300 ok300 commented Nov 6, 2024

This PR adds support for paying to a BOLT12 offer.

The flow is as follows:

  • user specifies a BOLT12 offer destination when paying
  • SDK calls Boltz endpoint that fetches a BOLT12 invoice for given offer
  • SDK calls send_payment_via_swap with the BOLT12 invoice as argument, instead of the usual BOLT11

Open questions

  • Should we also support paying directly to BOLT12 invoices, in addition to BOLT12 offers?
  • Expand PaymentDetails::Lightning with a new field for bolt12_invoice? And / or an optional bolt12_offer?
    • Or alternatively rename the existing bolt11 field to invoice, so it means either BOLT11 or BOLT12 invoice?
  • Should we fetch the invoice during prepare? This may take a long time for slow endpoints (Phoenix), causing the user to wait a few seconds for prepare to return.
  • Update sdk_common::input_parser to parse BOLT12 offers / invoice? Or keep changes local to the Liquid SDK?
    • Use BIP-353 "DNS Payment Instructions" for BOLT12 resolution? (similar to LN Address)

Open TODOs

  • Validate returned invoice (check signature) before trying to pay it
  • Detect / handle MRH in BOLT12 invoices
  • Handle both BOLT11 and BOLT12 in persister

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@dangeross dangeross left a comment

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Looking good

cli/src/commands.rs Outdated Show resolved Hide resolved
Comment on lines +868 to +870
_ => Err(PaymentError::amount_missing(
"Expected PayAmount of type Receiver when processing a Bolt12 offer",
)),
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I think it's fine to not handle the drain case now, there are issues to inverse calculate the Boltz fee #559.

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ok300 and others added 6 commits November 14, 2024 09:09
Co-authored-by: Ross Savage <551697+dangeross@users.noreply.github.com>
MRH with Bolt12 is not possible because receive is not yet supported.
Removed self-transfer check TODO, because self-transfers are not possible with Bolt12 when receive is not supported.
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3 participants