add nostr, and nostr_relays in config

contrib/requirements/requirements.txt

@@ -8,6 +8,7 @@ certifi
 attrs>=20.1.0
 jsonpatch
 electrum_ecc
+electrum_aionostr>=0.0.6
 
 # Note that we also need the dnspython[DNSSEC] extra which pulls in cryptography,
 # but as that is not pure-python it cannot be listed in this file!

electrum/gui/qt/settings_dialog.py

@@ -194,6 +194,13 @@ class SettingsDialog(QDialog, QtEventListener):
         self.set_alias_color()
         self.alias_e.editingFinished.connect(self.on_alias_edit)
 
+        nostr_relays_label = HelpLabel.from_configvar(self.config.cv.NOSTR_RELAYS)
+        nostr_relays = self.config.NOSTR_RELAYS
+        self.nostr_relays_e = QLineEdit(nostr_relays)
+        def on_nostr_edit():
+            self.config.NOSTR_RELAYS = str(self.nostr_relays_e.text())
+        self.nostr_relays_e.editingFinished.connect(on_nostr_edit)
+
         msat_cb = checkbox_from_configvar(self.config.cv.BTC_AMOUNTS_PREC_POST_SAT)
         msat_cb.setChecked(self.config.BTC_AMOUNTS_PREC_POST_SAT > 0)
         def on_msat_checked(_x):
@@ -392,6 +399,7 @@ class SettingsDialog(QDialog, QtEventListener):
         misc_widgets = []
         misc_widgets.append((updatecheck_cb, None))
         misc_widgets.append((filelogging_cb, None))
+        misc_widgets.append((nostr_relays_label, self.nostr_relays_e))
         misc_widgets.append((alias_label, self.alias_e))
         misc_widgets.append((qr_label, qr_combo))
 

electrum/simple_config.py

@@ -1207,6 +1207,18 @@ Warning: setting this to too low will result in lots of payment failures."""),
     SWAPSERVER_FEE_MILLIONTHS = ConfigVar('swapserver_fee_millionths', default=5000, type_=int)
     TEST_SWAPSERVER_REFUND = ConfigVar('test_swapserver_refund', default=False, type_=bool)
 
+    # nostr
+    NOSTR_RELAYS = ConfigVar(
+        'nostr_relays',
+        default='wss://relay.damus.io,wss://brb.io,wss://nostr.mom',
+        type_=str,
+        short_desc=lambda: _("Nostr relays"),
+        long_desc=lambda: ' '.join([
+            _('Nostr relays are used to send and receive submarine swap offers'),
+            _('If this list is empty, Electrum will use http instead'),
+        ]),
+    )
+
     # zeroconf channels
     ACCEPT_ZEROCONF_CHANNELS = ConfigVar('accept_zeroconf_channels', default=False, type_=bool)
     ZEROCONF_TRUSTED_NODE = ConfigVar('zeroconf_trusted_node', default='', type_=str)