add public electrum server type

src/main/java/com/sparrowwallet/sparrow/AppController.java

@@ -542,7 +542,18 @@ public class AppController implements Initializable {
     }
 
     private void setServerToggleTooltip(Integer currentBlockHeight) {
-        serverToggle.setTooltip(new Tooltip(AppServices.isConnected() ? "Connected to " + Config.get().getServerAddress() + (currentBlockHeight != null ? " at height " + currentBlockHeight : "") : "Disconnected"));
+        Tooltip tooltip = new Tooltip(getServerToggleTooltipText(currentBlockHeight));
+        tooltip.setShowDuration(Duration.seconds(15));
+        serverToggle.setTooltip(tooltip);
+    }
+
+    private String getServerToggleTooltipText(Integer currentBlockHeight) {
+        if(AppServices.isConnected()) {
+            return "Connected to " + Config.get().getServerAddress() + (currentBlockHeight != null ? " at height " + currentBlockHeight : "") +
+                    (Config.get().getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER ? "\nWarning! You are connected to a public server and sharing your transaction data with it.\nFor better privacy, consider using your own Bitcoin Core node or private Electrum server." : "");
+        }
+
+        return "Disconnected";
     }
 
     public void newWallet(ActionEvent event) {
@@ -1069,6 +1080,12 @@ public class AppController implements Initializable {
     }
 
     public void setServerType(ServerType serverType) {
+        if(serverType == ServerType.PUBLIC_ELECTRUM_SERVER && !serverToggle.getStyleClass().contains("public-server")) {
+            serverToggle.getStyleClass().add("public-server");
+        } else {
+            serverToggle.getStyleClass().remove("public-server");
+        }
+
         if(serverType == ServerType.BITCOIN_CORE && !serverToggle.getStyleClass().contains("core-server")) {
             serverToggle.getStyleClass().add("core-server");
         } else {

src/main/java/com/sparrowwallet/sparrow/io/Config.java

@@ -38,6 +38,7 @@ public class Config {
     private File hwi;
     private boolean hdCapture;
     private ServerType serverType;
+    private String publicElectrumServer;
     private String coreServer;
     private CoreAuthType coreAuthType;
     private File coreDataDir;
@@ -275,7 +276,7 @@ public class Config {
     }
 
     public String getServerAddress() {
-        return getServerType() == ServerType.BITCOIN_CORE ? getCoreServer() : getElectrumServer();
+        return getServerType() == ServerType.BITCOIN_CORE ? getCoreServer() : (getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER ? getPublicElectrumServer() : getElectrumServer());
     }
 
     public boolean requiresTor() {
@@ -291,6 +292,15 @@ public class Config {
         return protocol.isOnionAddress(protocol.getServerHostAndPort(getServerAddress()));
     }
 
+    public String getPublicElectrumServer() {
+        return publicElectrumServer;
+    }
+
+    public void setPublicElectrumServer(String publicElectrumServer) {
+        this.publicElectrumServer = publicElectrumServer;
+        flush();
+    }
+
     public String getCoreServer() {
         return coreServer;
     }

src/main/java/com/sparrowwallet/sparrow/net/ElectrumServer.java

@@ -53,7 +53,10 @@ public class ElectrumServer {
                 File electrumServerCert = null;
                 String proxyServer = null;
 
-                if(Config.get().getServerType() == ServerType.BITCOIN_CORE) {
+                if(Config.get().getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER) {
+                    electrumServer = Config.get().getPublicElectrumServer();
+                    proxyServer = Config.get().getProxyServer();
+                } else if(Config.get().getServerType() == ServerType.BITCOIN_CORE) {
                     if(bwtElectrumServer == null) {
                         throw new ServerConfigException("Could not connect to Bitcoin Core RPC");
                     }

src/main/java/com/sparrowwallet/sparrow/net/PublicElectrumServer.java

@@ -0,0 +1,38 @@
+package com.sparrowwallet.sparrow.net;
+
+public enum PublicElectrumServer {
+    BLOCKSTREAM_INFO("blockstream.info", "ssl://blockstream.info:700"),
+    ELECTRUM_BLOCKSTREAM_INFO("electrum.blockstream.info", "ssl://electrum.blockstream.info:50002"),
+    LUKECHILDS_CO("bitcoin.lukechilds.co", "ssl://bitcoin.lukechilds.co:50002");
+
+    PublicElectrumServer(String name, String url) {
+        this.name = name;
+        this.url = url;
+    }
+
+    private final String name;
+    private final String url;
+
+    public String getName() {
+        return name;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public static PublicElectrumServer fromUrl(String url) {
+        for(PublicElectrumServer server : values()) {
+            if(server.url.equals(url)) {
+                return server;
+            }
+        }
+
+        return null;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+}

src/main/java/com/sparrowwallet/sparrow/net/ServerType.java

@@ -1,7 +1,7 @@
 package com.sparrowwallet.sparrow.net;
 
 public enum ServerType {
-    BITCOIN_CORE("Bitcoin Core"), ELECTRUM_SERVER("Electrum Server");
+    BITCOIN_CORE("Bitcoin Core"), ELECTRUM_SERVER("Private Electrum"), PUBLIC_ELECTRUM_SERVER("Public Electrum");
 
     private final String name;
 

src/main/java/com/sparrowwallet/sparrow/preferences/PreferencesDialog.java

@@ -46,7 +46,7 @@ public class PreferencesDialog extends Dialog<Boolean> {
                 dialogPane.getButtonTypes().addAll(newWalletButtonType);
             }
 
-            dialogPane.setPrefWidth(650);
+            dialogPane.setPrefWidth(710);
             dialogPane.setPrefHeight(600);
 
             preferencesController.reconnectOnClosingProperty().set(AppServices.isConnecting() || AppServices.isConnected());

src/main/java/com/sparrowwallet/sparrow/preferences/ServerPreferencesController.java

@@ -23,6 +23,7 @@ import javafx.stage.Stage;
 import javafx.util.Duration;
 import net.freehaven.tor.control.TorControlError;
 import org.berndpruenster.netlayer.tor.Tor;
+import org.controlsfx.control.SegmentedButton;
 import org.controlsfx.glyphfont.Glyph;
 import org.controlsfx.validation.ValidationResult;
 import org.controlsfx.validation.ValidationSupport;
@@ -41,6 +42,7 @@ import java.security.cert.CertificateFactory;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.List;
+import java.util.Random;
 
 public class ServerPreferencesController extends PreferencesDetailController {
     private static final Logger log = LoggerFactory.getLogger(ServerPreferencesController.class);
@@ -48,6 +50,27 @@ public class ServerPreferencesController extends PreferencesDetailController {
     @FXML
     private ToggleGroup serverTypeToggleGroup;
 
+    @FXML
+    private SegmentedButton serverTypeSegmentedButton;
+
+    @FXML
+    private ToggleButton publicElectrumToggle;
+
+    @FXML
+    private Form publicElectrumForm;
+
+    @FXML
+    private ComboBox<PublicElectrumServer> publicElectrumServer;
+
+    @FXML
+    private UnlabeledToggleSwitch publicUseProxy;
+
+    @FXML
+    private TextField publicProxyHost;
+
+    @FXML
+    private TextField publicProxyPort;
+
     @FXML
     private Form coreForm;
 
@@ -135,13 +158,15 @@ public class ServerPreferencesController extends PreferencesDetailController {
 
         Platform.runLater(this::setupValidation);
 
+        publicElectrumForm.managedProperty().bind(publicElectrumForm.visibleProperty());
         coreForm.managedProperty().bind(coreForm.visibleProperty());
         electrumForm.managedProperty().bind(electrumForm.visibleProperty());
-        coreForm.visibleProperty().bind(electrumForm.visibleProperty().not());
         serverTypeToggleGroup.selectedToggleProperty().addListener((observable, oldValue, newValue) -> {
             if(serverTypeToggleGroup.getSelectedToggle() != null) {
                 ServerType existingType = config.getServerType();
                 ServerType serverType = (ServerType)newValue.getUserData();
+                publicElectrumForm.setVisible(serverType == ServerType.PUBLIC_ELECTRUM_SERVER);
+                coreForm.setVisible(serverType == ServerType.BITCOIN_CORE);
                 electrumForm.setVisible(serverType == ServerType.ELECTRUM_SERVER);
                 config.setServerType(serverType);
                 testConnection.setGraphic(getGlyph(FontAwesome5.Glyph.QUESTION_CIRCLE, ""));
@@ -153,12 +178,26 @@ public class ServerPreferencesController extends PreferencesDetailController {
                 oldValue.setSelected(true);
             }
         });
-        ServerType serverType = config.getServerType() != null ? config.getServerType() : (config.getCoreServer() == null && config.getElectrumServer() != null ? ServerType.ELECTRUM_SERVER : ServerType.BITCOIN_CORE);
+        ServerType serverType = config.getServerType() != null ?
+                (config.getServerType() == ServerType.PUBLIC_ELECTRUM_SERVER && Network.get() != Network.MAINNET ? ServerType.BITCOIN_CORE : config.getServerType()) :
+                    (config.getCoreServer() == null && config.getElectrumServer() != null ? ServerType.ELECTRUM_SERVER :
+                        (config.getCoreServer() != null || Network.get() != Network.MAINNET ? ServerType.BITCOIN_CORE : ServerType.PUBLIC_ELECTRUM_SERVER));
+        if(Network.get() != Network.MAINNET) {
+            serverTypeSegmentedButton.getButtons().remove(publicElectrumToggle);
+            serverTypeToggleGroup.getToggles().remove(publicElectrumToggle);
+        }
         serverTypeToggleGroup.selectToggle(serverTypeToggleGroup.getToggles().stream().filter(toggle -> toggle.getUserData() == serverType).findFirst().orElse(null));
 
+        publicElectrumServer.getSelectionModel().selectedItemProperty().addListener(getPublicElectrumServerListener(config));
+
+        publicUseProxy.selectedProperty().bindBidirectional(useProxy.selectedProperty());
+        publicProxyHost.textProperty().bindBidirectional(proxyHost.textProperty());
+        publicProxyPort.textProperty().bindBidirectional(proxyPort.textProperty());
+
         corePort.setTextFormatter(new TextFieldValidator(TextFieldValidator.ValidationModus.MAX_INTEGERS, 5).getFormatter());
         electrumPort.setTextFormatter(new TextFieldValidator(TextFieldValidator.ValidationModus.MAX_INTEGERS, 5).getFormatter());
         proxyPort.setTextFormatter(new TextFieldValidator(TextFieldValidator.ValidationModus.MAX_INTEGERS, 5).getFormatter());
+        publicProxyPort.setTextFormatter(new TextFieldValidator(TextFieldValidator.ValidationModus.MAX_INTEGERS, 5).getFormatter());
 
         coreHost.textProperty().addListener(getBitcoinCoreListener(config));
         corePort.textProperty().addListener(getBitcoinCoreListener(config));
@@ -245,6 +284,8 @@ public class ServerPreferencesController extends PreferencesDetailController {
             proxyHost.setText(proxyHost.getText().trim());
             proxyHost.setDisable(!newValue);
             proxyPort.setDisable(!newValue);
+            publicProxyHost.setDisable(!newValue);
+            publicProxyPort.setDisable(!newValue);
         });
 
         boolean isConnected = AppServices.isConnecting() || AppServices.isConnected();
@@ -277,6 +318,13 @@ public class ServerPreferencesController extends PreferencesDetailController {
             testConnection.setVisible(true);
         });
 
+        PublicElectrumServer configPublicElectrumServer = PublicElectrumServer.fromUrl(config.getPublicElectrumServer());
+        if(configPublicElectrumServer == null) {
+            publicElectrumServer.setValue(PublicElectrumServer.values()[new Random().nextInt(PublicElectrumServer.values().length)]);
+        } else {
+            publicElectrumServer.setValue(configPublicElectrumServer);
+        }
+
         String coreServer = config.getCoreServer();
         if(coreServer != null) {
             Protocol protocol = Protocol.getProtocol(coreServer);
@@ -340,6 +388,8 @@ public class ServerPreferencesController extends PreferencesDetailController {
         useProxy.setSelected(config.isUseProxy());
         proxyHost.setDisable(!config.isUseProxy());
         proxyPort.setDisable(!config.isUseProxy());
+        publicProxyHost.setDisable(!config.isUseProxy());
+        publicProxyPort.setDisable(!config.isUseProxy());
 
         String proxyServer = config.getProxyServer();
         if(proxyServer != null) {
@@ -407,6 +457,11 @@ public class ServerPreferencesController extends PreferencesDetailController {
     private void setFieldsEditable(boolean editable) {
         serverTypeToggleGroup.getToggles().forEach(toggle -> ((ToggleButton)toggle).setDisable(!editable));
 
+        publicElectrumServer.setDisable(!editable);
+        publicUseProxy.setDisable(!editable);
+        publicProxyHost.setDisable(!editable);
+        publicProxyPort.setDisable(!editable);
+
         coreHost.setDisable(!editable);
         corePort.setDisable(!editable);
         coreAuthToggleGroup.getToggles().forEach(toggle -> ((ToggleButton)toggle).setDisable(!editable));
@@ -455,6 +510,15 @@ public class ServerPreferencesController extends PreferencesDetailController {
     }
 
     private void setupValidation() {
+        validationSupport.registerValidator(publicProxyHost, Validator.combine(
+                (Control c, String newValue) -> ValidationResult.fromErrorIf( c, "Proxy host required", publicUseProxy.isSelected() && newValue.isEmpty()),
+                (Control c, String newValue) -> ValidationResult.fromErrorIf( c, "Invalid host name", getHost(newValue) == null)
+        ));
+
+        validationSupport.registerValidator(publicProxyPort, Validator.combine(
+                (Control c, String newValue) -> ValidationResult.fromErrorIf( c, "Invalid proxy port", !newValue.isEmpty() && !isValidPort(Integer.parseInt(newValue)))
+        ));
+
         validationSupport.registerValidator(coreHost, Validator.combine(
                 (Control c, String newValue) -> ValidationResult.fromErrorIf( c, "Invalid Core host", getHost(newValue) == null)
         ));
@@ -499,6 +563,13 @@ public class ServerPreferencesController extends PreferencesDetailController {
         validationSupport.setValidationDecorator(new StyleClassValidationDecoration());
     }
 
+    @NotNull
+    private ChangeListener<PublicElectrumServer> getPublicElectrumServerListener(Config config) {
+        return (observable, oldValue, newValue) -> {
+            config.setPublicElectrumServer(newValue.getUrl());
+        };
+    }
+
     @NotNull
     private ChangeListener<String> getBitcoinCoreListener(Config config) {
         return (observable, oldValue, newValue) -> {

src/main/resources/com/sparrowwallet/sparrow/preferences/preferences.css

@@ -32,3 +32,20 @@
 .scroll-pane {
     -fx-background-color: transparent;
 }
+
+.public-warning {
+    -fx-text-fill: rgb(238, 210, 2);
+}
+
+.public-electrum {
+    -fx-text-fill: linear-gradient(to bottom, derive(rgb(238, 210, 2), 30%), rgb(238, 210, 2));
+}
+
+.bitcoin-core {
+    -fx-text-fill: linear-gradient(to bottom, derive(#50a14f, 30%), #50a14f);
+}
+
+.private-electrum {
+    -fx-text-fill: linear-gradient(to bottom, derive(#0b99c9, 30%), #0b99c9);
+}
+

src/main/resources/com/sparrowwallet/sparrow/preferences/server.fxml

@@ -16,6 +16,9 @@
 <?import com.sparrowwallet.sparrow.net.ServerType?>
 <?import com.sparrowwallet.sparrow.net.CoreAuthType?>
 <?import com.sparrowwallet.sparrow.control.HelpLabel?>
+<?import javafx.collections.FXCollections?>
+<?import com.sparrowwallet.sparrow.net.PublicElectrumServer?>
+<?import com.sparrowwallet.sparrow.control.CopyableLabel?>
 <GridPane hgap="10.0" vgap="10.0" stylesheets="@preferences.css, @../general.css" xmlns="http://javafx.com/javafx/10.0.2-internal" xmlns:fx="http://javafx.com/fxml/1" fx:controller="com.sparrowwallet.sparrow.preferences.ServerPreferencesController">
     <padding>
         <Insets left="25.0" right="25.0" top="25.0" />
@@ -30,17 +33,31 @@
     <Form GridPane.columnIndex="0" GridPane.rowIndex="0">
         <Fieldset inputGrow="SOMETIMES" text="Server">
             <Field text="Type:">
-                <SegmentedButton>
+                <SegmentedButton fx:id="serverTypeSegmentedButton">
                     <toggleGroup>
                         <ToggleGroup fx:id="serverTypeToggleGroup" />
                     </toggleGroup>
                     <buttons>
+                        <ToggleButton fx:id="publicElectrumToggle" text="Public Electrum" toggleGroup="$serverTypeToggleGroup">
+                            <graphic>
+                                <Glyph fontFamily="Font Awesome 5 Free Solid" fontSize="12" icon="TOGGLE_ON" styleClass="public-electrum" />
+                            </graphic>
+                            <userData>
+                                <ServerType fx:constant="PUBLIC_ELECTRUM_SERVER"/>
+                            </userData>
+                        </ToggleButton>
                         <ToggleButton text="Bitcoin Core" toggleGroup="$serverTypeToggleGroup">
+                            <graphic>
+                                <Glyph fontFamily="Font Awesome 5 Free Solid" fontSize="12" icon="TOGGLE_ON" styleClass="bitcoin-core" />
+                            </graphic>
                             <userData>
                                 <ServerType fx:constant="BITCOIN_CORE"/>
                             </userData>
                         </ToggleButton>
-                        <ToggleButton text="Electrum Server" toggleGroup="$serverTypeToggleGroup">
+                        <ToggleButton text="Private Electrum" toggleGroup="$serverTypeToggleGroup">
+                            <graphic>
+                                <Glyph fontFamily="Font Awesome 5 Free Solid" fontSize="12" icon="TOGGLE_ON" styleClass="private-electrum" />
+                            </graphic>
                             <userData>
                                 <ServerType fx:constant="ELECTRUM_SERVER"/>
                             </userData>
@@ -51,6 +68,43 @@
         </Fieldset>
     </Form>
 
+    <Form fx:id="publicElectrumForm" GridPane.columnIndex="0" GridPane.rowIndex="1">
+        <Fieldset inputGrow="SOMETIMES" text="Public Electrum Server">
+            <Field text="URL:">
+                <ComboBox fx:id="publicElectrumServer">
+                    <items>
+                        <FXCollections fx:factory="observableArrayList">
+                            <PublicElectrumServer fx:constant="BLOCKSTREAM_INFO" />
+                            <PublicElectrumServer fx:constant="ELECTRUM_BLOCKSTREAM_INFO" />
+                            <PublicElectrumServer fx:constant="LUKECHILDS_CO" />
+                        </FXCollections>
+                    </items>
+                </ComboBox>
+            </Field>
+            <Field text="">
+                <Label alignment="CENTER">
+                    <graphic>
+                        <Glyph fontFamily="Font Awesome 5 Free Solid" fontSize="12" icon="EXCLAMATION_TRIANGLE" styleClass="public-warning" />
+                    </graphic>
+                    <padding>
+                        <Insets right="5" />
+                    </padding>
+                </Label>
+                <CopyableLabel text="Warning!" />
+            </Field>
+            <Field text="">
+                <CopyableLabel text="Using a public server means it can see your transactions."/>
+            </Field>
+            <Field text="Use Proxy:">
+                <UnlabeledToggleSwitch fx:id="publicUseProxy"/>
+            </Field>
+            <Field text="Proxy URL:">
+                <TextField fx:id="publicProxyHost" />
+                <TextField fx:id="publicProxyPort" prefWidth="80" />
+            </Field>
+        </Fieldset>
+    </Form>
+
     <Form fx:id="coreForm" GridPane.columnIndex="0" GridPane.rowIndex="1">
         <Fieldset inputGrow="SOMETIMES" text="Bitcoin Core RPC">
             <Field text="URL:">
@@ -98,7 +152,7 @@
     </Form>
 
     <Form fx:id="electrumForm" GridPane.columnIndex="0" GridPane.rowIndex="1">
-        <Fieldset inputGrow="SOMETIMES" text="Electrum Server">
+        <Fieldset inputGrow="SOMETIMES" text="Private Electrum Server">
             <Field text="URL:">
                 <TextField fx:id="electrumHost" promptText="e.g. 127.0.0.1"/>
                 <TextField fx:id="electrumPort" promptText="e.g. 50002" prefWidth="80" />