res.json( status: 'transferred', size: sourceStream.headers.get('content-length') ); ;
Your phone/laptop acts only as the controller , not the storage medium . The file moves directly between two remote locations (cloud storage, VPS, NAS, etc.). ┌─────────────┐ Control Signal ┌─────────────────┐ │ Controller │ ─────────────────────→ │ C2C Manager │ │ (Your PC/ │ │ (Core Engine) │ │ Phone) │ ←───────────────────── │ │ └─────────────┘ Status Updates └────────┬────────┘ │ Direct Transfer (no controller) │ ┌───────────────────────┼───────────────────────┐ ↓ ↓ ↓ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │ Source A │ ──────→ │ Source B │ │ Source C │ │ (HTTP/FTP/ │ Data │ (Cloud │ │ (NAS/ │ │ S3/BTFS) │ Flow │ Storage) │ │ Server) │ └─────────────┘ └─────────────┘ └─────────────┘ Key Features | Feature | Description | |---------|-------------| | No Local Storage | Files never touch your controller device | | Remote-to-Remote | Transfer directly between two URLs/remotes | | Multi-Protocol | HTTP, HTTPS, FTP, SFTP, S3, WebDAV, IPFS, BitTorrent | | Resume Support | Interrupted transfers resume from last byte | | Bandwidth Shaping | Limit speed per transfer | | Scheduling | Run transfers during off-peak hours | | Web UI / CLI | Control from anywhere | | Notifications | Telegram/Discord/Webhook on completion | Example Use Cases 1. Cloud-to-Cloud Backup Source: s3://my-backup-bucket/file.zip Target: webdavs://nextcloud.example.com/remote.php/dav/files/backups/ Controller: Your phone (only sends command) 2. Seedbox to Personal NAS Source: https://seedbox.example.com/linux.iso Target: sftp://nas.local/volume1/downloads/ Controller: Laptop (can go offline after start) 3. IPFS to HTTP Archive Source: ipfs://QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco Target: https://archive.org/upload/ Controller: Raspberry Pi (low-power orchestrator) Sample Implementation (Python + FastAPI) # c2c_download_manager.py from fastapi import FastAPI, BackgroundTasks from pydantic import BaseModel import aiohttp import asyncio from typing import Optional app = FastAPI(title="C2C Download Manager") c2c download manager
jobs = {}
Trigger from anywhere with an HTTP call – no persistent server needed. | Aspect | C2C Download Manager | Traditional DM | |--------|---------------------|----------------| | Data path | Remote → Remote | Remote → Local | | Controller bandwidth | Near zero | Full file size | | Controller uptime | Not required | Must stay on | | Resume across reboots | Yes | Limited | | Best for | Server migrations, cloud backups, seedboxes | Personal downloads | Cloud-to-Cloud Backup Source: s3://my-backup-bucket/file
class TransferJob(BaseModel): source_url: str target_url: str chunk_size: int = 8192 * 1024 # 8MB overwrite: bool = False headers: Optional[dict] = None | Aspect | C2C Download Manager | Traditional
# Stream to target (simplified PUT example) async with session.put(job.target_url, data=resp.content) as target_resp: if target_resp.status in (200, 201): jobs[job_id] = "status": "complete", "size": total else: jobs[job_id] = "status": "failed", "error": f"Target error target_resp.status" except Exception as e: jobs[job_id] = "status": "failed", "error": str(e) @app.post("/transfer") async def start_transfer(job: TransferJob, background: BackgroundTasks): job_id = str(uuid.uuid4()) jobs[job_id] = "status": "starting" background.add_task(c2c_transfer, job_id, job) return "job_id": job_id, "status": "accepted"