How to get filename in multipart post request using Dart/Aqueduct - dart

Question

I am trying to upload image from client (flutter) to server (Aqueduct.io) using MultipartRequest.
It's working, but currently file names are assigned the current time, how can I pass the filename from a client and parse it on a server side?
Client code:
final String imageName = nameController.text.replaceAll(" ", "");
var postUri = Uri.parse("http://***:8888/media");
var request = new http.MultipartRequest("POST", postUri);
request.files.add(new http.MultipartFile.fromBytes('file', image,
filename: imageName, contentType: MediaType('image', 'jpeg')));
request.send().then((response) {
if (response.statusCode == 200) print("Uploaded!");
});
}
Server code:
import 'dart:async';
import 'dart:io';
import 'package:aqueduct/aqueduct.dart';
import 'package:mime/mime.dart';
import 'package:http_server/http_server.dart';
class MediaController extends ResourceController {
MediaController() {
acceptedContentTypes = [ContentType("multipart", "form-data")];
}
#Operation.post()
Future<Response> postMultipartForm() async {
final transformer = MimeMultipartTransformer(
request.raw.headers.contentType.parameters["boundary"]);
final bodyStream =
Stream.fromIterable([await request.body.decode<List<int>>()]);
final parts = await transformer.bind(bodyStream).toList();
for (var part in parts) {
final HttpMultipartFormData multipart = HttpMultipartFormData.parse(part);
final content = multipart.cast<List<int>>();
final filePath =
"public/" + DateTime.now().millisecondsSinceEpoch.toString() + ".jpg"; // <---current filename implementation
final IOSink sink = File(filePath).openWrite();
await for (List<int> item in content) {
sink.add(item);
}
await sink.flush();
await sink.close();
}
return Response.ok({});
}
}

Answer 1

Okay, I have the asnwer
import 'dart:async';
import 'dart:io';
import 'package:aqueduct/aqueduct.dart';
import 'package:mime/mime.dart';
import 'package:http_server/http_server.dart';
class MediaController extends ResourceController {
MediaController() {
acceptedContentTypes = [ContentType("multipart", "form-data")];
}
#Operation.post()
Future<Response> postMultipartForm() async {
final transformer = MimeMultipartTransformer(
request.raw.headers.contentType.parameters["boundary"]);
final bodyStream =
Stream.fromIterable([await request.body.decode<List<int>>()]);
final parts = await transformer.bind(bodyStream).toList();
for (var part in parts) {
final HttpMultipartFormData multipart = HttpMultipartFormData.parse(part);
List<String> tokens = part.headers['content-disposition'].split(";");
String filename;
for (var i = 0; i < tokens.length; i++) {
if (tokens[i].contains('filename')) {
filename = tokens[i]
.substring(tokens[i].indexOf("=") + 2, tokens[i].length - 1);
}
}
print('file $filename.jpg uploaded');
final content = multipart.cast<List<int>>();
final filePath =
// "public/" + DateTime.now().millisecondsSinceEpoch.toString() + ".jpg";
'public/$filename.jpg';
final IOSink sink = File(filePath).openWrite();
await for (List<int> item in content) {
sink.add(item);
}
await sink.flush();
await sink.close();
}
return Response.ok({});
}
}