qt: initial support for bolt12 offers

Author: accumulator

electrum/gui/icons/bolt12.png

@@ -111,7 +111,10 @@ def update(self):
         for idx, item in enumerate(self.wallet.get_unpaid_invoices()):
             key = item.get_id()
             if item.is_lightning():
-                icon_name = 'lightning.png'
+                if item.lightning_invoice:
+                    icon_name = 'lightning.png'
+                else:
+                    icon_name = 'bolt12.png'
             else:
                 icon_name = 'bitcoin.png'
                 if item.bip70:

electrum/gui/qt/invoice_list.py

@@ -50,7 +50,7 @@
 import electrum
 from electrum.gui import messages
 from electrum import (keystore, constants, util, bitcoin, commands,
-                      paymentrequest, lnutil)
+                      paymentrequest, lnutil, bolt12)
 from electrum.bitcoin import COIN, is_address, DummyAddress
 from electrum.plugin import run_hook
 from electrum.i18n import _
@@ -1704,7 +1704,13 @@ def do_export():
 
     def show_lightning_invoice(self, invoice: Invoice):
         from electrum.util import format_short_id
-        lnaddr = lndecode(invoice.lightning_invoice)
+        if bolt12_invoice_tlv := invoice.bolt12_invoice_tlv():
+            bolt12_inv = bolt12.decode_invoice(bolt12_invoice_tlv)
+            lnaddr = bolt12.to_lnaddr(bolt12_inv)
+        elif invoice.lightning_invoice:
+            lnaddr = lndecode(invoice.lightning_invoice)  # FIXME: assumes BOLT11, should be abstracted by Invoice
+        else:
+            raise Exception()
         d = WindowModalDialog(self, _("Lightning Invoice"))
         vbox = QVBoxLayout(d)
         grid = QGridLayout()

electrum/gui/qt/main_window.py

@@ -449,7 +449,8 @@ def update_fields(self):
         lock_recipient = pi.type in [PaymentIdentifierType.LNURL, PaymentIdentifierType.LNURLW,
                                      PaymentIdentifierType.LNURLP, PaymentIdentifierType.LNADDR,
                                      PaymentIdentifierType.OPENALIAS, PaymentIdentifierType.BIP70,
-                                     PaymentIdentifierType.BIP21, PaymentIdentifierType.BOLT11] and not pi.need_resolve()
+                                     PaymentIdentifierType.BIP21, PaymentIdentifierType.BOLT11,
+                                     PaymentIdentifierType.BOLT12_OFFER] and not pi.need_resolve()
         lock_amount = pi.is_amount_locked()
         lock_max = lock_amount or pi.type not in [PaymentIdentifierType.SPK, PaymentIdentifierType.BIP21]
 
@@ -491,8 +492,9 @@ def update_fields(self):
         amount_valid = is_spk_script or bool(self.amount_e.get_amount())
 
         self.send_button.setEnabled(not pi_unusable and amount_valid and not pi.has_expired())
-        self.save_button.setEnabled(not pi_unusable and not is_spk_script and not pi.has_expired() and \
-                                    pi.type not in [PaymentIdentifierType.LNURLP, PaymentIdentifierType.LNADDR])
+        self.save_button.setEnabled(not pi_unusable and not is_spk_script and pi.type not in [ \
+            PaymentIdentifierType.LNURLP, PaymentIdentifierType.LNADDR, PaymentIdentifierType.BOLT12_OFFER
+        ])
 
         self.invoice_error.setText(_('Expired') if pi.has_expired() else '')
 
@@ -580,6 +582,8 @@ def on_finalize_done(self, pi: PaymentIdentifier):
             self.show_error(pi.error)
             return
         invoice = pi.bolt11
+        if not invoice and pi.bolt12_offer:
+            invoice = Invoice.from_bolt12_invoice_tlv(pi.bolt12_invoice_tlv)
         self.pending_invoice = invoice
         self.logger.debug(f'after finalize invoice: {invoice!r}')
         self.do_pay_invoice(invoice)