Refactor database layer: convert to DatabaseProvider class with initialization

bin/routes/geo_routes.dart

@@ -0,0 +1,56 @@
+import 'package:shelf/shelf.dart';
+import 'package:shelf_router/shelf_router.dart';
+import '../database/database_provider.dart';
+import 'dart:convert';
+
+class GeoRoutes {
+  final DatabaseProvider database;
+
+  GeoRoutes(this.database);
+
+  Router get routes {
+    final router = Router();
+    router.post('/geo', _createPosition);
+    router.put('/geo', _updatePosition);
+    router.post('/share', _createShare);
+    return router;
+  }
+
+  Future<Response> _createPosition(Request request) async {
+    final body = await request.readAsString();
+    final data = jsonDecode(body);
+
+    final userId = data['user_id'];
+    final x = data['x'];
+    final y = data['y'];
+    final lifetimeSeconds = data['lifetime'];
+    final lifetime = Duration(seconds: lifetimeSeconds);
+
+    final position = await database.createPosition(userId, x, y, lifetime);
+    return Response(201, body: position.toJson());
+  }
+
+  Future<Response> _updatePosition(Request request) async {
+    final body = await request.readAsString();
+    final data = jsonDecode(body);
+
+    final userId = data['user_id'];
+    final x = data['x'];
+    final y = data['y'];
+    final lifetimeSeconds = data['lifetime'];
+    final lifetime = Duration(seconds: lifetimeSeconds);
+
+    final position = await database.updatePosition(userId, x, y, lifetime);
+    return Response(200, body: position.toJson());
+  }
+
+  Future<Response> _createShare(Request request) async {
+    final body = await request.readAsString();
+    final data = jsonDecode(body);
+
+    final userId = data['user_id'];
+    final shareId = database.createShareId(userId);
+
+    return Response(200, body: jsonEncode({'share_id': shareId}));
+  }
+}