Fixes downloading of jar files

Links to knarcraft.net updated.
Code for parsing the new minecraft vanilla json files added.
Adds auto updates

.gitignore

@@ -14,7 +14,6 @@
 .mtj.tmp/
 
 # Package Files #
-*.jar
 *.war
 *.ear
 *.zip

config/currentversion.csv

@@ -0,0 +1,2 @@
+alpha
+1.1.0

config/servertypes.csv

@@ -2,7 +2,7 @@ Vanilla;Latest,1.12.2,1.11.2,1.10.2,1.9.4,1.8.9,1.7.10,1.6.4,1.5.2,1.4.7,1.3.2,1
 Snapshot;Latest;https://launchermeta.mojang.com/mc/game/version_manifest.json;"snapshot":";";https://s3.amazonaws.com/Minecraft.Download/versions/;/minecraft_server.
 SpongeVanilla;1.12.2,1.11.2,1.10.2,1.8.9;https://dl-api.spongepowered.org/v1/org.spongepowered/spongevanilla/downloads?type=stable&minecraft=;"version":";",;https://repo.spongepowered.org/maven/org/spongepowered/spongevanilla/;/spongevanilla-
 Bungee;Latest;https://ci.md-5.net/job/BungeeCord/lastSuccessfulBuild/artifact/bootstrap/target/;Artifacts of BungeeCord #; ;http://ci.md-5.net/job/BungeeCord/lastSuccessfulBuild/artifact/bootstrap/target/BungeeCord.jar;
-Spigot;1.12.2,1.11.2,1.10.2,1.9.4,1.9.4,1.8.8,1.7.10,1.6.4,1.5.2,1.4.7;https://knarcraft.net/Api/Download/bungeeminecraftserverlauncher/jars/Spigot/
+Spigot;1.13.1,1.12.2,1.11.2,1.10.2,1.9.4,1.9.4,1.8.8,1.7.10,1.6.4,1.5.2,1.4.7;https://static.knarcraft.net/public/jars/
-MCPCplus;1.6.4,1.6.2,1.5.2,1.4.7;https://knarcraft.net/Api/Download/bungeeminecraftserverlauncher/jars/MCPC+/
+MCPCplus;1.6.4,1.6.2,1.5.2,1.4.7;https://static.knarcraft.net/public/jars/
-Craftbukkit;1.12.2,1.11.2,1.10.2,1.9.4,1.8.8,1.7.10,1.6.4,1.5.2,1.4.6,1.3.2,1.2.5,1.1,1.0;https://knarcraft.net/Api/Download/bungeeminecraftserverlauncher/jars/Bukkit/
+Craftbukkit;1.13.1,1.12.2,1.11.2,1.10.2,1.9.4,1.8.8,1.7.10,1.6.4,1.5.2,1.4.6,1.3.2,1.2.5,1.1,1.0;https://static.knarcraft.net/public/jars/
 Custom;;

src/META-INF/MANIFEST.MF

@@ -1,3 +1,4 @@
 Manifest-Version: 1.0
+Class-Path: gson-2.8.5.jar
 Main-Class: net.knarcraft.serverlauncher.Main
 

src/net/knarcraft/serverlauncher/Main.java

@@ -1,5 +1,9 @@
 package net.knarcraft.serverlauncher;
 
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
 import net.knarcraft.serverlauncher.profile.Collection;
 import net.knarcraft.serverlauncher.profile.Profile;
 import net.knarcraft.serverlauncher.server.Server;
@@ -7,13 +11,17 @@ import net.knarcraft.serverlauncher.server.ServerType;
 import net.knarcraft.serverlauncher.userinterface.ServerConsoles;
 
 import javax.naming.ConfigurationException;
+import javax.swing.*;
 import java.awt.*;
 import java.io.*;
 import java.net.URISyntaxException;
+import java.util.Scanner;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 
+import static net.knarcraft.serverlauncher.Shared.downloadFile;
+import static net.knarcraft.serverlauncher.Shared.readFile;
 import static net.knarcraft.serverlauncher.Shared.stringBetween;
 //Java 8 required.
 
@@ -26,25 +34,18 @@ import static net.knarcraft.serverlauncher.Shared.stringBetween;
  */
 
 public class Main {
-    @SuppressWarnings("CanBeFinal")
     private static String appDir;
     private static boolean running = false;
+    private static final String updateChannel = "alpha";
+    private static final String updateURL = "https://api.knarcraft.net/minecraftserverlauncher";
 
-    static {
+    public static void main(String[] args) throws IOException {
-        try {
+        checkForUpdate();
-            appDir = String.valueOf(new File(Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()).getParentFile());
-        } catch (URISyntaxException e) {
-            e.printStackTrace();
-            System.exit(1);
-        }
         try (PrintWriter file = new PrintWriter(Main.getAppDir() + File.separator + "latestrun.log")) {
             file.print("");
         } catch (IOException e ) {
             e.printStackTrace();
         }
-    }
-
-    public static void main(String[] args) {
         EventQueue.invokeLater(() -> {
             try {
                 setup();
@@ -58,6 +59,9 @@ public class Main {
         });
     }
 
+    /**
+     * Loads all server types, so that they are ready for use
+     */
     private static void setup() {
         try {
             ServerType.loadServerTypes();
@@ -67,7 +71,20 @@ public class Main {
         }
     }
 
+    /**
+     * Retrieves the directory the .jar file is running from
+     *
+     * @return  A string path
+     */
     public static String getAppDir() {
+        if (appDir == null) {
+            try {
+                appDir = String.valueOf(new File(Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath()).getParentFile());
+            } catch (URISyntaxException e) {
+                e.printStackTrace();
+                System.exit(1);
+            }
+        }
         return appDir;
     }
 
@@ -165,4 +182,84 @@ public class Main {
         }
         return playerName;
     }
+
+    /**
+     * Checks if a newer version is available
+     *
+     * @throws IOException
+     */
+    private static void checkForUpdate() throws IOException {
+        Scanner file;
+        try {
+            file = new Scanner(new File("config/currentversion.csv"));
+        } catch (FileNotFoundException e) {
+            file = new Scanner(Main.class.getResourceAsStream("/config/currentversion.csv"));
+        }
+
+        String oldType = file.nextLine();
+        String oldVer = file.nextLine();
+
+        String data = readFile(updateURL);
+        JsonObject jsonObject = new JsonParser().parse(data).getAsJsonObject();
+        String latest = jsonObject.getAsJsonObject("latest").get(updateChannel).getAsString();
+
+        if (!oldType.equals(updateChannel) || !oldVer.equals(latest)) {
+            String dir = getAppDir() + File.separator;
+            JsonArray versionList = jsonObject.getAsJsonArray("versions");
+            String url = "";
+            for (JsonElement elem : versionList) {
+                JsonObject obj = elem.getAsJsonObject();
+                String ver = obj.get("id").getAsString();
+                String type = obj.get("type").getAsString();
+                if (ver.equals(latest) && type.equals(updateChannel)) {
+                    url = obj.get("url").getAsString();
+                }
+            }
+            if (downloadFile(url, new File(dir + "update.jar").toPath())) {
+                doUpdate(dir);
+            } else {
+                JOptionPane.showMessageDialog(
+                        null,
+                        "An update is available, but could not be downloaded.",
+                        "Update available",
+                        JOptionPane.ERROR_MESSAGE
+                );
+            }
+        }
+    }
+
+    private static void doUpdate(String dir) {
+        int answer = JOptionPane.showConfirmDialog(
+                null,
+                "An update is available. Do you want to update?",
+                "Update available",
+                JOptionPane.YES_NO_OPTION
+        );
+        if (answer == JOptionPane.YES_NO_OPTION) {
+            if (new File (dir + "Minecraft-Server-Launcher.jar").renameTo(new File(dir + "Old.jar"))) {
+                if (new File(dir + "update.jar").renameTo(new File (dir + "Minecraft-Server-Launcher.jar"))) {
+                    if (new File(dir + "Old.jar").delete()) {
+                        JOptionPane.showMessageDialog(
+                                null,
+                                "Update finished. Please run the software again.",
+                                "Update complete",
+                                JOptionPane.INFORMATION_MESSAGE
+                        );
+                        System.exit(0);
+                    }
+                } else {
+                    if (!new File(dir + "Old.jar").renameTo(new File (dir + "Minecraft-Server-Launcher.jar"))) {
+                        System.out.println("Shit");
+                    }
+                }
+            }
+            JOptionPane.showMessageDialog(
+                    null,
+                    "Could not replace the main .jar with the downloaded .jar.",
+                    "Update failed",
+                    JOptionPane.ERROR_MESSAGE
+            );
+        }
+
+    }
 }

src/net/knarcraft/serverlauncher/profile/Profile.java

@@ -521,10 +521,16 @@ public class Profile {
             downloadAll();
             printToGui("Finished downloading jars");
         } catch (FileNotFoundException e) {
-            printToGui("One or more downloads failed: " + e.getMessage());
+            throw new FileNotFoundException("One or more downloads failed: " + e.getMessage());
         }
     }
 
+    /**
+     * Prints something to the gui status field if the gui exists
+     * Otherwise it prints to the console
+     *
+     * @param str   The string to show the user
+     */
     private static void printToGui(String str) {
         if (gui != null) {
             gui.setStatus(str);

src/net/knarcraft/serverlauncher/userinterface/GUI.java

@@ -552,7 +552,7 @@ public class GUI implements ActionListener {
         } else if (e.getSource() == chckbxmntmDownloadJars) {
             downloadJars();
         } else if (e.getSource() == mntmErrors) {
-            goToURL("https://knarcraft.net/Bungeeminecraftserverlauncher/Info/");
+            goToURL("https://archive.knarcraft.net/BungeeMinecraftServerLauncherInfo/");
         } else if (e.getSource() == mntmSetup) {
             JOptionPane.showMessageDialog(
                     null,
@@ -561,7 +561,7 @@ public class GUI implements ActionListener {
                     JOptionPane.INFORMATION_MESSAGE
             );
         } else if (e.getSource() == mntmManualUpdate) {
-            goToURL("https://knarcraft.net/Downloads/Bungeeminecraftserverlauncher/");
+            goToURL("https://git.knarcraft.net/EpicKnarvik97/Minecraft-Server-Launcher");
         } else if (e.getSource() == mntmRunInBackground) {
             JOptionPane.showMessageDialog(
                     null,
@@ -591,7 +591,7 @@ public class GUI implements ActionListener {
                     JOptionPane.INFORMATION_MESSAGE
             );
         } else if (e.getSource() == mntmStory) {
-            goToURL("https://knarcraft.net/Bungeeminecraftserverlauncher/Story/");
+            goToURL("https://archive.knarcraft.net/BungeeminecraftserverlauncherStory/");
         } else if (e.getSource() == btnStartServer) {
                 try {
                     Profile.getCurrent().save();