[#69] Elwig: Add functionality to upload and replace database

Elwig/Helpers/Export/ElwigData.cs

@@ -370,6 +370,28 @@ namespace Elwig.Helpers.Export {
             }.Export(filename);
         }
 
+        public static void ImportDatabase(string filename) {
+            var oldName = Path.ChangeExtension(App.Config.DatabaseFile, ".old.sqlite3");
+            var newName = Path.ChangeExtension(App.Config.DatabaseFile, ".new.sqlite3");
+            try {
+                using (var zip = ZipFile.Open(filename, ZipArchiveMode.Read)) {
+                    var db = zip.GetEntry("database.sqlite3")!;
+                    db.ExtractToFile(newName, true);
+                }
+                File.Move(App.Config.DatabaseFile, oldName, true);
+                File.Move(newName, App.Config.DatabaseFile, false);
+            } finally {
+                if (File.Exists(newName))
+                    File.Delete(newName);
+            }
+        }
+
+        public static void ExportDatabase(string filename) {
+            File.Delete(filename);
+            using var zip = ZipFile.Open(filename, ZipArchiveMode.Create);
+            var db = zip.CreateEntryFromFile(App.Config.DatabaseFile, "database.sqlite3", CompressionLevel.SmallestSize);
+        }
+
         public class ElwigExport {
             public (IEnumerable<Member> Members, IEnumerable<string> Filters)? Members { get; set; }
             public (IEnumerable<AreaCom> AreaComs, IEnumerable<string> Filters)? AreaComs { get; set; }