funkblubber/lib/funkwhale.dart

import 'dart:core';
import 'dart:io';
import 'package:dio/dio.dart';
import 'package:funkblubber/funkentity.dart';
import 'package:funkblubber/console.dart' as console;

Future<bool> download({
  required final FunkObject object,
  required final String path,
}) async {
  bool success = false;
  console.info('Downloading');
  switch (object.kind) {
    case FunkEntity.album:
      success = await _downloadAlbum(object, path);
      break;

    case FunkEntity.artist:
      success = await _downloadArtist(object, path);
      break;

    case FunkEntity.track:
      success = await _downloadTrack(object, path);
      break;

    default:
      console.info('   nothing...');
      break;
  }

  return success;
}

Future<bool> _downloadArtist(
  final FunkObject object,
  final String path,
) async {
  Response response = await Dio().get(
    'https://${object.domain}/api/v1/artists/${object.id}/?'
    'refresh=false',
  );

  final String pathAppend = response.data['name'];
  bool folderCreated = true;
  try {
    await Directory('$path/$pathAppend').create();
  } catch (e) {
    console.error(e.toString());
    folderCreated = false;
  }
  if (!folderCreated) {
    return false;
  }
  console.info('Artist: $pathAppend');

  response = await Dio().get(
    'https://${object.domain}/api/v1/albums/?'
    'artist=${object.id}&ordering=creation_date&'
    'page=1&page_size=16&scope=all',
  );

  final List<Future<bool>> results = [];
  for (final albumResponse in response.data['results']) {
    final result = _downloadAlbum(
      FunkObject(
        domain: object.domain,
        id: albumResponse['id'].toString(),
        kind: FunkEntity.album,
      ),
      '$path/$pathAppend',
    );

    results.add(result);
  }

  final List<bool> successes = await Future.wait(results);
  return successes.every((final success) => success);
}

Future<bool> _downloadAlbum(
  final FunkObject object,
  final String path,
) async {
  final response = await Dio().get(
    'https://${object.domain}/api/v1/tracks/?'
    'album=${object.id}&ordering=creation_date&'
    'page=1&page_size=16&scope=all',
  );

  final String pathAppend = response.data['results'][0]['album']['title'];
  bool folderCreated = true;
  try {
    await Directory('$path/$pathAppend').create();
  } catch (e) {
    console.error(e.toString());
    folderCreated = false;
  }
  if (!folderCreated) {
    return false;
  }
  console.info('Album: $pathAppend');

  final List<Future<bool>> results = [];
  for (final songResponse in response.data['results']) {
    final String songTitle = songResponse['title'];
    final String ext = songResponse['uploads'][0]['extension'];
    final result = _downloadTrackObject(
      FunkObject(
        domain: object.domain,
        id: songResponse['listen_url'],
        kind: FunkEntity.track,
      ),
      '$path/$pathAppend/$songTitle.$ext',
    );

    results.add(result);
  }

  final List<bool> successes = await Future.wait(results);
  return successes.every((final success) => success);
}

Future<bool> _downloadTrack(
  final FunkObject object,
  final String path,
) async {
  final response = await Dio().get(
    'https://${object.domain}/api/v1/tracks/${object.id}/?refresh=false',
  );

  final String songTitle = response.data['title'];
  final String ext = response.data['uploads'][0]['extension'];
  return _downloadTrackObject(
    FunkObject(
      domain: object.domain,
      id: response.data['uploads'][0]['listen_url'],
      kind: FunkEntity.track,
    ),
    '$path/$songTitle.$ext',
  );
}

Future<bool> _downloadTrackObject(
  final FunkObject object,
  final String path,
) async {
  bool success = true;
  try {
    final Response response = await Dio().get(
      'https://${object.domain}${object.id}',
      options: Options(
        responseType: ResponseType.bytes,
        followRedirects: false,
      ),
    );
    console.info('- $path');
    final File file = File(path);
    final accessFile = file.openSync(mode: FileMode.write);
    accessFile.writeFromSync(response.data);
    await accessFile.close();
  } catch (e) {
    console.error(e.toString());
    success = false;
  }

  return success;
}