qBittorrent Integration

Status: ✅ Implemented

Free, open-source BitTorrent client with comprehensive Web API.

Enterprise Torrent Addition

Challenge: /api/v2/torrents/add returns only "Ok." without torrent hash.

Solution (Professional):

Magnet Links:

Extract info_hash from magnet URI (deterministic)
Upload via urls parameter
Return extracted hash immediately

Torrent Files:

Download .torrent file to memory
Parse with parse-torrent (bencode decoder)
Extract info_hash (SHA-1 of info dict)
Upload file content via torrents parameter (multipart/form-data)
Return extracted hash immediately

Benefits: Deterministic, no race conditions, works with Docker networking, handles expired URLs

API Endpoints

Base: http://qbittorrent:8080/api/v2 Auth: Cookie-based (login required)

POST /auth/login - Get session cookie POST /torrents/add - Add torrent (supports urls and torrents params) GET /torrents/info?hashes={hash} - Get status/progress POST /torrents/pause - Pause torrent POST /torrents/resume - Resume POST /torrents/delete - Delete torrent GET /torrents/files - Get file list POST /torrents/setCategory - Set category

Config

Required (database only, no env fallbacks):

qbittorrent_url
qbittorrent_username
qbittorrent_password
paths_downloads

Validation: All fields checked before service initialization.

Data Models

interface TorrentInfo {
  hash: string;
  name: string;
  size: number;
  progress: number; // 0.0-1.0
  dlspeed: number; // bytes/s
  upspeed: number;
  eta: number; // seconds
  state: TorrentState;
  category: string;
  savePath: string;
  completionDate: number;
}

type TorrentState = 'downloading' | 'uploading' | 'stalledDL' |
  'pausedDL' | 'queuedDL' | 'checkingDL' | 'error' | 'missingFiles';

Fixed Issues ✅

1. Naive torrent identification - Fixed with deterministic hash extraction 2. Docker networking issues - Fixed by downloading .torrent ourselves 3. Duplicate detection - Check if hash exists before adding 4. Config fallbacks to env - Removed, database only 5. Unclear error messages - List missing fields explicitly 6. Race condition on torrent availability - Fixed with 3s initial delay + exponential backoff retry (500ms, 1s, 2s) 7. Error logging during duplicate check - Removed console.error in getTorrent() during expected "not found" cases (duplicate checking) 8. Prowlarr magnet link redirects - Some indexers return HTTP URLs that redirect to magnet: links. Fixed by intercepting 3xx redirects before axios follows them, extracting the Location header, and routing to magnet flow if target is a magnet: link

Tech Stack

axios (HTTP + cookie mgmt)
parse-torrent (bencode + hash extraction)
form-data (multipart uploads)

See File Organization for seeding support

2.9 KiB Raw Blame History