gui: allow user to not validate the ssl domain for an electrum server

contrib/lianad_config_example.toml

@@ -50,8 +50,13 @@ poll_interval_secs = 30
 # In order to connect, it needs the address as a string, which can be
 # optionally prefixed with "ssl://" or "tcp://". If omitted, "tcp://"
 # will be assumed.
+# `validate_domain` field is optional: used in case of SSL connection,
+# if set to `false`, internal electrum client will not try to validate
+# the domain associated to the certificate: it's useful in case of 
+# self-signed certificate. It's default value is `true`.
 # [electrum_config]
 # addr = "127.0.0.1:50001"
+# validate_domain = false
 #
 #
 [bitcoind_config]

liana-gui/src/app/state/settings/bitcoind.rs

@@ -323,6 +323,7 @@ impl BitcoindSettings {
                     }
                 }
             }
+            view::SettingsEditMessage::ValidateDomainEdited(_) => {}
             view::SettingsEditMessage::BitcoindRpcAuthTypeSelected(auth_type) => {
                 if !self.processing {
                     self.selected_auth_type = auth_type;
@@ -462,6 +463,7 @@ impl ElectrumSettings {
                     daemon_config.bitcoin_backend =
                         Some(lianad::config::BitcoinBackend::Electrum(ElectrumConfig {
                             addr: self.addr.value.clone(),
+                            validate_domain: self.electrum_config.validate_domain,
                         }));
                     self.processing = true;
                     return Command::perform(async move { daemon_config }, |cfg| {
@@ -470,6 +472,11 @@ impl ElectrumSettings {
                 }
             }
             view::SettingsEditMessage::Clipboard(text) => return clipboard::write(text),
+            view::SettingsEditMessage::ValidateDomainEdited(b) => {
+                if !self.processing {
+                    self.electrum_config.validate_domain = b;
+                }
+            }
             _ => {}
         };
         Command::none()
@@ -484,6 +491,7 @@ impl ElectrumSettings {
                 cache.blockheight,
                 &self.addr,
                 self.processing,
+                self.electrum_config.validate_domain,
             )
         } else {
             view::settings::electrum(

liana-gui/src/app/view/message.rs

@@ -88,6 +88,7 @@ pub enum RemoteBackendSettingsMessage {
 pub enum SettingsEditMessage {
     Select,
     FieldEdited(&'static str, String),
+    ValidateDomainEdited(bool),
     BitcoindRpcAuthTypeSelected(RpcAuthType),
     Cancel,
     Confirm,

liana-gui/src/app/view/settings.rs

@@ -32,7 +32,7 @@ use crate::{
     hw::HardwareWallet,
     node::{
         bitcoind::{RpcAuthType, RpcAuthValues},
-        electrum,
+        electrum::{self, validate_domain_checkbox},
     },
 };
 
@@ -563,6 +563,7 @@ pub fn electrum_edit<'a>(
     blockheight: i32,
     addr: &form::Value<String>,
     processing: bool,
+    validate_domain: bool,
 ) -> Element<'a, SettingsEditMessage> {
     let mut col = Column::new().spacing(20);
     if is_configured_node_type && blockheight != 0 {
@@ -595,6 +596,9 @@ pub fn electrum_edit<'a>(
             .push(separation().width(Length::Fill));
     }
 
+    let checkbox = validate_domain_checkbox(addr, validate_domain, |b| {
+        SettingsEditMessage::ValidateDomainEdited(b)
+    });
     col = col.push(
         Column::new()
             .push(text("Address:").bold().small())
@@ -606,6 +610,7 @@ pub fn electrum_edit<'a>(
                 .size(P1_SIZE)
                 .padding(5),
             )
+            .push_maybe(checkbox)
             .push(text(electrum::ADDRESS_NOTES).size(P2_SIZE))
             .spacing(5),
     );

liana-gui/src/installer/message.rs

@@ -81,6 +81,7 @@ pub enum DefineBitcoind {
 #[derive(Debug, Clone)]
 pub enum DefineElectrum {
     ConfigFieldEdited(electrum::ConfigField, String),
+    ValidDomainChanged(bool),
 }
 
 #[derive(Debug, Clone)]

liana-gui/src/installer/step/node/electrum.rs

@@ -14,9 +14,19 @@ use crate::{
     node::electrum::ConfigField,
 };
 
-#[derive(Clone, Default)]
+#[derive(Clone)]
 pub struct DefineElectrum {
     address: form::Value<String>,
+    validate_domain: bool,
+}
+
+impl Default for DefineElectrum {
+    fn default() -> Self {
+        Self {
+            address: Default::default(),
+            validate_domain: true,
+        }
+    }
 }
 
 impl DefineElectrum {
@@ -38,6 +48,7 @@ impl DefineElectrum {
                             crate::node::electrum::is_electrum_address_valid(&value);
                     }
                 },
+                message::DefineElectrum::ValidDomainChanged(v) => self.validate_domain = v,
             };
         };
         Command::none()
@@ -47,19 +58,23 @@ impl DefineElectrum {
         if self.can_try_ping() {
             ctx.bitcoin_backend = Some(lianad::config::BitcoinBackend::Electrum(ElectrumConfig {
                 addr: self.address.value.clone(),
+                validate_domain: self.validate_domain,
             }));
             return true;
         }
         false
     }
 
     pub fn view(&self) -> Element<Message> {
-        view::define_electrum(&self.address)
+        view::define_electrum(&self.address, self.validate_domain)
     }
 
     pub fn ping(&self) -> Result<(), Error> {
         let builder = electrum_client::Config::builder();
-        let config = builder.timeout(Some(3)).build();
+        let config = builder
+            .timeout(Some(3))
+            .validate_domain(self.validate_domain)
+            .build();
         let client = electrum_client::Client::from_config(&self.address.value, config)
             .map_err(|e| Error::Electrum(e.to_string()))?;
         client

liana-gui/src/installer/view/mod.rs

@@ -29,6 +29,7 @@ use liana_ui::{
     widget::*,
 };
 
+use crate::node::electrum::validate_domain_checkbox;
 use crate::{
     hw::{is_compatible_with_tapminiscript, HardwareWallet, UnsupportedReason},
     installer::{
@@ -1134,7 +1135,15 @@ pub fn define_bitcoind<'a>(
         .into()
 }
 
-pub fn define_electrum<'a>(address: &form::Value<String>) -> Element<'a, Message> {
+pub fn define_electrum<'a>(
+    address: &form::Value<String>,
+    validate_domain: bool,
+) -> Element<'a, Message> {
+    let checkbox = validate_domain_checkbox(address, validate_domain, |b| {
+        Message::DefineNode(DefineNode::DefineElectrum(
+            message::DefineElectrum::ValidDomainChanged(b),
+        ))
+    });
     let col_address = Column::new()
         .push(text("Address:").bold())
         .push(
@@ -1150,7 +1159,8 @@ pub fn define_electrum<'a>(address: &form::Value<String>) -> Element<'a, Message
             .size(text::P1_SIZE)
             .padding(10),
         )
-        .push(text(electrum::ADDRESS_NOTES).size(text::P2_SIZE))
+        .push_maybe(checkbox)
+        .push(text(electrum::ADDRESS_NOTES))
         .spacing(10);
 
     Column::new().push(col_address).spacing(50).into()

liana-gui/src/node/electrum.rs

@@ -1,13 +1,18 @@
 use std::fmt;
 
+use iced::{widget::checkbox, Element, Renderer};
+use liana_ui::{component::form, theme::Theme};
+
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub enum ConfigField {
     Address,
 }
 
 pub const ADDRESS_NOTES: &str = "Note: include \"ssl://\" as a prefix \
-    for SSL connections. Be aware that self-signed \
-    SSL certificates are currently not supported.";
+    for SSL connections.";
+
+pub const VALID_SSL_DOMAIN_NOTES: &str = "Do not validate SSL Domain \
+    (check this only if you want to use a self-signed certificate)";
 
 impl fmt::Display for ConfigField {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
@@ -17,6 +22,27 @@ impl fmt::Display for ConfigField {
     }
 }
 
+pub fn validate_domain_checkbox<'a, F, M>(
+    addr: &form::Value<String>,
+    value: bool,
+    closure: F,
+) -> Option<Element<'a, M, Theme, Renderer>>
+where
+    F: 'a + Fn(bool) -> M,
+    M: 'a,
+{
+    let checkbox = checkbox(VALID_SSL_DOMAIN_NOTES, !value).on_toggle(move |b| closure(!b));
+    if addr.valid && is_ssl(&addr.value) {
+        Some(checkbox.into())
+    } else {
+        None
+    }
+}
+
+pub fn is_ssl(value: &str) -> bool {
+    value.starts_with("ssl://")
+}
+
 pub fn is_electrum_address_valid(value: &str) -> bool {
     let value_noprefix = if value.starts_with("ssl://") {
         value.replacen("ssl://", "", 1)