Added file upload in talk

lib/api/marianumcloud/files-sharing/fileSharingApi.dart

@@ -0,0 +1,30 @@
+import 'dart:developer';
+import 'dart:io';
+
+import 'package:http/http.dart' as http;
+import 'package:http/http.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import 'fileSharingApiParams.dart';
+
+class FileSharingApi {
+  Future<void> share(FileSharingApiParams query) async {
+    var preferences = await SharedPreferences.getInstance();
+
+    Map<String, String> headers = {};
+    headers.putIfAbsent("Accept", () => "application/json");
+    headers.putIfAbsent("OCS-APIRequest", () => "true");
+
+    Uri endpoint = Uri.https("${preferences.getString("username")!}:${preferences.getString("password")!}@cloud.marianum-fulda.de", "/ocs/v2.php/apps/files_sharing/api/v1/shares", query.toJson().map((key, value) => MapEntry(key, value.toString())));
+
+    log("request file share");
+    Response response = await http.post(endpoint, headers: headers);
+
+    if(response.statusCode != HttpStatus.ok) {
+      throw Exception("Api call failed with ${response.statusCode}: ${response.body}");
+    } else {
+      log("File share successfull: ${response.body}");
+    }
+
+  }
+}