qt: fix enable/disable max button for openalias and restrict openalias to address only

electrum/gui/qt/send_tab.py

@@ -207,7 +207,8 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
 
     def spend_max(self):
         assert self.payto_e.payment_identifier is not None
-        assert self.payto_e.payment_identifier.type in [PaymentIdentifierType.SPK, PaymentIdentifierType.MULTILINE]
+        assert self.payto_e.payment_identifier.type in [PaymentIdentifierType.SPK, PaymentIdentifierType.MULTILINE,
+                                                        PaymentIdentifierType.OPENALIAS]
         if run_hook('abort_send', self):
             return
         outputs = self.payto_e.payment_identifier.get_onchain_outputs('!')
@@ -379,7 +380,10 @@ class SendTab(QWidget, MessageBoxMixin, Logger):
         lock_recipient = pi.type != PaymentIdentifierType.SPK \
                          and not (pi.type == PaymentIdentifierType.EMAILLIKE and pi.state in [PaymentIdentifierState.NOT_FOUND,PaymentIdentifierState.NEED_RESOLVE])
         lock_amount = pi.is_amount_locked()
-        lock_max = lock_amount or pi.type in [PaymentIdentifierType.BOLT11, PaymentIdentifierType.LNURLP, PaymentIdentifierType.LNADDR]
+        lock_max = lock_amount \
+                   or pi.type in [PaymentIdentifierType.BOLT11, PaymentIdentifierType.LNURLP,
+                                  PaymentIdentifierType.LNADDR, PaymentIdentifierType.EMAILLIKE]
+
         self.lock_fields(lock_recipient=lock_recipient,
                          lock_amount=lock_amount,
                          lock_max=lock_max,

electrum/payment_identifier.py

@@ -401,7 +401,8 @@ class PaymentIdentifier(Logger):
                             'WARNING: the alias "{}" could not be validated via an additional '
                             'security check, DNSSEC, and thus may not be correct.').format(self.emaillike)
                     try:
-                        scriptpubkey = self.parse_output(address)
+                        assert bitcoin.is_address(address)
+                        scriptpubkey = bytes.fromhex(bitcoin.address_to_script(address))
                         self._type = PaymentIdentifierType.OPENALIAS
                         self.spk = scriptpubkey
                         self.set_state(PaymentIdentifierState.AVAILABLE)