Add support for palladium BIP21 URI scheme

The changes introduce a new URI scheme 'palladium' alongside the existing 'bitcoin' scheme for BIP21 payment URIs. This allows the wallet to parse and handle palladium payment URIs in the same way as bitcoin URIs.

electrum/bip21.py

@@ -10,6 +10,7 @@ from .lnaddr import lndecode, LnDecodeException
 
 # note: when checking against these, use .lower() to support case-insensitivity
 BITCOIN_BIP21_URI_SCHEME = 'bitcoin'
+PALLADIUM_BIP21_URI_SCHEME = 'palladium'
 LIGHTNING_URI_SCHEME = 'lightning'
 
 
@@ -29,8 +30,8 @@ def parse_bip21_URI(uri: str) -> dict:
         return {'address': uri}
 
     u = urllib.parse.urlparse(uri)
-    if u.scheme.lower() != BITCOIN_BIP21_URI_SCHEME:
-        raise InvalidBitcoinURI("Not a bitcoin URI")
+    if u.scheme.lower() != PALLADIUM_BIP21_URI_SCHEME:
+        raise InvalidBitcoinURI("Not a palladium URI")
     address = u.path
 
     # python for android fails to parse query
@@ -120,7 +121,7 @@ def create_bip21_uri(addr, amount_sat: Optional[int], message: Optional[str],
         v = urllib.parse.quote(v)
         query.append(f"{k}={v}")
     p = urllib.parse.ParseResult(
-        scheme=BITCOIN_BIP21_URI_SCHEME,
+        scheme=PALLADIUM_BIP21_URI_SCHEME,
         netloc='',
         path=addr,
         params='',

electrum/payment_identifier.py

@@ -20,7 +20,7 @@ from .lnurl import (decode_lnurl, request_lnurl, callback_lnurl, LNURLError,
 from .bitcoin import opcodes, construct_script
 from .lnaddr import LnInvoiceException
 from .lnutil import IncompatibleOrInsaneFeatures
-from .bip21 import parse_bip21_URI, InvalidBitcoinURI, LIGHTNING_URI_SCHEME, BITCOIN_BIP21_URI_SCHEME
+from .bip21 import parse_bip21_URI, InvalidBitcoinURI, LIGHTNING_URI_SCHEME, BITCOIN_BIP21_URI_SCHEME, PALLADIUM_BIP21_URI_SCHEME
 from . import paymentrequest
 
 if TYPE_CHECKING:
@@ -245,7 +245,7 @@ class PaymentIdentifier(Logger):
                     self.logger.debug(f'Exception cause {e.args!r}')
                     return
                 self.set_state(PaymentIdentifierState.AVAILABLE)
-        elif text.lower().startswith(BITCOIN_BIP21_URI_SCHEME + ':'):
+        elif text.lower().startswith(BITCOIN_BIP21_URI_SCHEME + ':') or text.lower().startswith(PALLADIUM_BIP21_URI_SCHEME + ':'):
             try:
                 out = parse_bip21_URI(text)
             except InvalidBitcoinURI as e: