Add connecion test for SFTP

src/main/java/build.ps1

@@ -10,7 +10,8 @@ $modules = $(
     "result",
     "javafx.controls",
     "javafx.fxml",
-    "org.apache.commons.cli"
+    "org.apache.commons.cli",
+    "com.jcraft.jsch"
 )
 $addModules = $modules -join ","
 javac --module-path $modulePath --add-modules $addModules .\name\nathanmcrae\numbersstation\*.java -d out

src/main/java/name/nathanmcrae/numbersstation/StationSettingsController.java

@@ -3,6 +3,9 @@ package name.nathanmcrae.numbersstation;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import com.jcraft.jsch.JSch;
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.Session;
 import java.io.File;
 import java.io.IOException;
 import java.time.format.DateTimeFormatter;
@@ -11,6 +14,7 @@ import java.time.LocalTime;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.Optional;
+import javafx.beans.binding.Bindings;
 import javafx.beans.property.BooleanProperty;
 import javafx.beans.property.IntegerProperty;
 import javafx.beans.property.ObjectProperty;
@@ -27,6 +31,7 @@ import javafx.fxml.FXMLLoader;
 import javafx.scene.control.Button;
 import javafx.scene.control.CheckBox;
 import javafx.scene.control.DatePicker;
+import javafx.scene.control.Label;
 import javafx.scene.control.ListCell;
 import javafx.scene.control.ListView;
 import javafx.scene.control.RadioButton;
@@ -45,8 +50,14 @@ import javafx.stage.Stage;
 import javafx.util.Callback;
 
 public class StationSettingsController {
+    public enum ConnectionStatus {
+            SUCCESS, FAILURE, NEUTRAL
+    }
+
     private static final Logger logger = Logger.getLogger(Main.class.getName());
 
+    private ObjectProperty<ConnectionStatus> connectionTestStatus = new SimpleObjectProperty<>(ConnectionStatus.NEUTRAL);
+    private StringProperty connectionTestDescription = new SimpleStringProperty();
     private IntegerProperty digitsPerGroup = new SimpleIntegerProperty();
     private StringProperty externalProgramCommand = new SimpleStringProperty();
     private BooleanProperty manageScheduleExternally = new SimpleBooleanProperty();
@@ -61,6 +72,9 @@ public class StationSettingsController {
     private StringProperty scheduleStartTime = new SimpleStringProperty();
     private StringProperty username = new SimpleStringProperty();
 
+    @FXML
+    private Label connectionTestStatusLabel;
+
     @FXML
     private TextField stationNameField;
 
@@ -128,6 +142,17 @@ public class StationSettingsController {
 
     @FXML
     private void initialize() {
+        connectionTestStatusLabel.styleProperty().bind(Bindings.createStringBinding(() -> {
+            switch (connectionTestStatus.get()) {
+                case SUCCESS:
+                    return "-fx-text-fill: green;";
+                case FAILURE:
+                    return "-fx-text-fill: red;";
+                default:
+                    return "-fx-text-fill: black;";
+            }
+        }, connectionTestStatus));
+        connectionTestStatusLabel.textProperty().bindBidirectional(connectionTestDescription);
         externalProgramCommandField.textProperty().bindBidirectional(externalProgramCommand);
         manageScheduleExternallyCheckBox.selectedProperty().bindBidirectional(manageScheduleExternally);
         stationNameField.textProperty().bindBidirectional(stationName);
@@ -409,6 +434,37 @@ public class StationSettingsController {
 
     @FXML
     private void handleTestConnectionButtonPress() {
+        if (messageMethod.get() == StationSettings.MessageMethod.SFTP) {
+            String host = stationAddress.get();
+            String user = username.get();
+            String pass = password.get();
+
+            connectionTestDescription.set("Testing connection");
+            connectionTestStatus.set(ConnectionStatus.NEUTRAL);
+
+            JSch jsch = new JSch();
+            try {
+                Session session = jsch.getSession(user, host, 22);
+                session.setPassword(pass);
+                session.setConfig("StrictHostKeyChecking", "no");
+                session.connect(30000); // 30 seconds timeout
+
+                if (session.isConnected()) {
+                    logger.log(Level.INFO, "SFTP connection successful");
+                    connectionTestDescription.set("Connection succeeded");
+                    connectionTestStatus.set(ConnectionStatus.SUCCESS);
+                    session.disconnect();
+                } else {
+                    connectionTestDescription.set("No error, but not connected");
+                    connectionTestStatus.set(ConnectionStatus.FAILURE);
+                    logger.log(Level.SEVERE, "SFTP connection failed");
+                }
+            } catch (JSchException e) {
+                connectionTestDescription.set(e.getMessage());
+                connectionTestStatus.set(ConnectionStatus.FAILURE);
+                logger.log(Level.SEVERE, "SFTP connection failed", e);
+            }
+        }
     }
 
     @FXML

src/main/java/name/nathanmcrae/numbersstation/StationSettingsView.fxml

@@ -98,6 +98,7 @@
                         <PasswordField fx:id="passwordField" layoutX="444.0" layoutY="95.0" prefHeight="25.0" prefWidth="135.0" AnchorPane.rightAnchor="0.0" />
                         <TextField fx:id="externalProgramCommandField" layoutX="140.0" layoutY="131.0" prefHeight="25.0" prefWidth="438.0" AnchorPane.leftAnchor="140.0" AnchorPane.rightAnchor="0.0" />
                         <Button fx:id="testConnectionButton" layoutX="188.0" layoutY="65.0" mnemonicParsing="false" onMousePressed="#handleTestConnectionButtonPress" text="Test connection" />
+                        <Label fx:id="connectionTestStatusLabel" layoutX="188.0" layoutY="99.0" prefHeight="17.0" prefWidth="185.0" AnchorPane.leftAnchor="188.0" AnchorPane.rightAnchor="205.0" />
                      
                    </children>
                      <VBox.margin>

src/main/java/run.ps1

@@ -11,7 +11,8 @@ $modules = $(
     "result",
     "javafx.controls",
     "javafx.fxml",
-    "org.apache.commons.cli"
+    "org.apache.commons.cli",
+    "com.jcraft.jsch"
 )
 $addModules = $modules -join ","
 java --module-path $modulePath --add-modules $addModules -cp out name.nathanmcrae.numbersstation.Main @args