Added check for insufficient space

src/main/java/org/terasology/launcher/game/GameDownloader.java

@@ -19,15 +19,18 @@
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.terasology.launcher.util.BundleUtils;
 import org.terasology.launcher.util.DirectoryUtils;
 import org.terasology.launcher.util.DownloadException;
 import org.terasology.launcher.util.DownloadUtils;
 import org.terasology.launcher.util.FileUtils;
+import org.terasology.launcher.util.GuiUtils;
 import org.terasology.launcher.util.ProgressListener;
 
 import java.io.File;
 import java.io.IOException;
 import java.net.URL;
+import java.util.zip.ZipEntry;
 
 public final class GameDownloader {
 
@@ -85,7 +88,17 @@ public File getGameDirectory() {
     }
 
     public void download(ProgressListener listener) throws DownloadException {
-        DownloadUtils.downloadToFile(downloadURL, downloadZipFile, listener);
+        long contentLength = DownloadUtils.getContentLength(downloadURL);
+        long availableSpace = downloadZipFile.getParentFile().getUsableSpace();
+        if (availableSpace >= contentLength) {
+            if (availableSpace <= contentLength * 2) {
+                GuiUtils.showWarningMessageDialog(null, BundleUtils.getLabel("message_warning_lowOnSpace"));
+            }
+            DownloadUtils.downloadToFile(downloadURL, downloadZipFile, listener);
+        } else {
+            logger.error("Insufficient space in " + downloadZipFile.getParent());
+            GuiUtils.showErrorMessageDialog(null, BundleUtils.getLabel("message_error_insufficientSpace"));
+        }
     }
 
     public boolean extractAfterDownload() {

src/main/java/org/terasology/launcher/util/DownloadUtils.java

@@ -37,6 +37,7 @@
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
+import java.net.ProtocolException;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
@@ -105,6 +106,21 @@ public static void downloadToFile(URL downloadURL, File file, ProgressListener l
         }
     }
 
+    public static long getContentLength(URL downloadURL) throws DownloadException {
+        HttpURLConnection connection = null;
+        try {
+            connection = (HttpURLConnection) downloadURL.openConnection();
+            connection.setRequestMethod("HEAD");
+            return connection.getContentLengthLong();
+        } catch (IOException e) {
+            throw new DownloadException("Could not send HEAD request to HTTP-URL! URL=" + downloadURL, e);
+        } finally {
+            if (connection != null) {
+                connection.disconnect();
+            }
+        }
+    }
+
     private static HttpURLConnection getConnectedDownloadConnection(URL downloadURL) throws DownloadException {
         final HttpURLConnection connection;
         try {

src/main/resources/org/terasology/launcher/bundle/LabelsBundle.properties

@@ -67,6 +67,7 @@ message_error_gameDirectory=
 message_error_gameDownload_downloadExtract=
 message_error_gameDownload_loadVersion=
 message_error_gameStart=
+message_error_insufficientSpace=
 message_error_launcherDirectory=
 message_error_launcherInstallationDirectory=
 message_error_launcherStart=
@@ -83,6 +84,7 @@ message_update_installationDirectory=
 message_update_latest=
 message_update_launcher=
 message_update_launcher_title=
+message_warning_lowOnSpace=
 settings_cancel=
 settings_game_buildType_Terasology=
 settings_game_buildType_TerasologyStable=

src/main/resources/org/terasology/launcher/bundle/LabelsBundle_en.properties

@@ -67,6 +67,7 @@ message_error_gameDirectory=Cannot create or use game installation directory\!
 message_error_gameDownload_downloadExtract=The game download and extraction process failed.
 message_error_gameDownload_loadVersion=The game downloaded and extracted okay, but required version information was not found.
 message_error_gameStart=Could not start the game\!
+message_error_insufficientSpace=Insufficient free space in the download directory to download the game\! Aborting...
 message_error_launcherDirectory=Cannot create or use launcher directory\!
 message_error_launcherInstallationDirectory=Cannot detect or use launcher installation directory\!
 message_error_launcherStart=Starting TerasologyLauncher failed\!
@@ -83,6 +84,7 @@ message_update_installationDirectory=Installation directory\:
 message_update_latest=Latest version\:
 message_update_launcher=A launcher update is available.\nThe installation directory will be deleted during installation.\nWould you like to update the launcher?
 message_update_launcher_title=Launcher update available\!
+message_warning_lowOnSpace=The download directory is running low on space\!
 settings_cancel=Cancel
 settings_game_buildType_Terasology=Development build (normal)
 settings_game_buildType_TerasologyStable=Stable release (normal)