Add some basic initial functionality to download mods

lib/game.dart

@@ -92,6 +92,46 @@ class GameServerPageState extends State<GameServerPage> {
                     Navigator.pushNamed(context, "/server/mods");
                   },
                 ),
+                ListTile(
+                  title: Text("Download Mods"),
+                  subtitle: Text("Downloads the mods"),
+                  leading: Icon(Icons.download_sharp),
+                  onTap: () async {
+                    // Triggers the download status
+                    setState(() {
+                      downloading = true;
+                    });
+
+                    // Now, invoke SteamCmd to download the workshop mods. This is an authenticated action, and does require Scmd2fa
+                    var result = await Process.run(settings.getSteamCmd2FA(),
+                        ["--raw", "--secret", settings.steam_creds!.secret]);
+                    var code = result.stdout;
+                    // Build download command
+
+                    List<String> manifest = [
+                      "+@sSteamCmdForcePlatformType",
+                      "windows",
+                      "+force_install_dir",
+                      settings.getModPath(),
+                      "+login",
+                      settings.steam_creds!.username,
+                      settings.steam_creds!.password,
+                      code
+                    ];
+                    for (Mod M in settings.mods) {
+                      manifest.add("+workshop_download_item");
+                      manifest.add("${M.mod_id}");
+                    }
+
+                    result =
+                        await Process.run(settings.getSteamCmd(), manifest);
+
+                    // Unset downloading
+                    setState(() {
+                      downloading = false;
+                    });
+                  },
+                ),
                 ListTile(
                   title: Text("Status:"),
                   subtitle: Text("Not Running"),
@@ -211,6 +251,7 @@ class ModPage extends StatelessWidget {
   String instance = "";
   bool isNewMod = false;
   bool willDelete = false;
+  String pak = "Not initialized";
 
   @override
   Widget build(BuildContext context) {
@@ -223,6 +264,7 @@ class ModPage extends StatelessWidget {
         name.text = args.mod_name;
         isNewMod = args.newMod;
         instance = args.mod_instance_id();
+        pak = args.mod_pak;
       }
     }
 
@@ -280,6 +322,11 @@ class ModPage extends StatelessWidget {
               title: Text("Mod Instance ID"),
               subtitle: Text(instance),
             ),
+            ListTile(
+              title: Text("Mod Pak File: $pak"),
+              subtitle:
+                  Text("Mod pak file name as detected during downloading"),
+            ),
             if (!isNewMod)
               ElevatedButton(
                   onPressed: () {

lib/mod.dart

@@ -11,6 +11,9 @@ class Mod {
   @HiveField(1)
   int mod_id;
 
+  @HiveField(2)
+  String mod_pak;
+
   bool newMod = false;
   String _id = "";
   String mod_instance_id() {
@@ -21,5 +24,9 @@ class Mod {
     return _id;
   }
 
-  Mod({this.mod_name = "undef", this.mod_id = 0, this.newMod = false});
+  Mod(
+      {this.mod_name = "undef",
+      this.mod_id = 0,
+      this.newMod = false,
+      this.mod_pak = "Not Initialized"});
 }

lib/settings.dart

@@ -77,6 +77,24 @@ class Settings {
         (Platform.isWindows ? ".exe" : ".sh");
   }
 
+  String getSteamCmd2FA() {
+    return steamcmd_path +
+        Platform.pathSeparator +
+        "steamcmd-2fa" +
+        (Platform.isWindows ? ".exe" : "");
+  }
+
+  String getModPath() {
+    return game_path + Platform.pathSeparator + "mods";
+  }
+
+  void assertModsFolderExists() {
+    if (Directory(getModPath()).existsSync())
+      return;
+    else
+      Directory(getModPath()).createSync(recursive: true);
+  }
+
   bool serverInstalled() {
     return File(
             getServerPath() + Platform.pathSeparator + "ConanSandboxServer.exe")