transferit-py 0.1.0.dev1

Pure-Python client for transfer.it — upload and download files via the MEGA backend, no browser required.

transferit

Upload and download files on transfer.it from Python or your terminal — no browser, no MEGA account, no external CLI tools.

from transferit import Transferit

with Transferit() as tx:
    url = tx.upload("report.pdf").url     # → https://transfer.it/t/…

• End-to-end encrypted — AES-128-CTR + CBC-MAC, identical scheme to the official web client.
• Concurrent WebSocket uploads — up to 8 connections per file, matching MEGA's ulDefConcurrency.
• Streaming download + decrypt via httpx.stream — constant memory regardless of file size.
• Folders — uploaded recursively, hierarchy preserved both ways.
• Every form field wired up — title, message, password, sender, expiry, notify-on-expiry, max-downloads, recipients, scheduled delivery.
• Rich CLI & library API — the same four verbs (upload / download / info / metadata) in either surface, with --json everywhere for scripting.

Install

Use case	Command
Library only	pip install transferit-py
Library + CLI	pip install 'transferit-py[cli]'

Requires Python 3.11+. uv add transferit-py / uv add 'transferit-py[cli]' works the same way.

CLI

Command	Purpose
transferit upload PATH	Upload a file or folder; print the share link
transferit download LINK	Mirror a transfer into a local directory
transferit info LINK	Metadata panel + file/folder tree
transferit metadata LINK	Metadata panel only

Every command supports --json for machine-readable output. LINK can be either a full share URL or the bare 12-character handle.

# simplest — one file, no options
transferit upload report.pdf

# folder upload, 7-day expiry
transferit upload ./project -e 7d --sender [e-mail]

# full "Send files" mode
transferit upload big.mp4 \
    --title "Q1 demo"      --message "review please" \
    --password hunter2     --sender [e-mail]  \
    --expiry 7d            --notify-expiry          \
    --max-downloads 50                              \
    -r [e-mail] -r [e-mail]         \
    --schedule 2026-04-25T09:00

--expiry accepts any duration from 1s to 10y: 30s, 5m, 2h, 7d, 1w, 1y, or compound forms like 1y6m3d. Run transferit <command> --help for the full flag list.

Library

The entire surface is a single class — Transferit. One instance owns an HTTP connection pool and (lazily) an anonymous ephemeral MEGA account that's reused across every write-side call.

from transferit import Transferit

with Transferit(default_sender="[e-mail]", default_expiry="7d") as tx:
    result = tx.upload("./q1.pdf", title="Quarterly report")
    # => UploadResult(xh=…, url=…, title=…, total_bytes=…, file_count=1, folder_count=0)

    meta   = tx.metadata(result.url)       # → TransferInfo
    nodes  = tx.info(result.url)           # → list[TransferNode]
    tx.download(result.url, "./dl")        # → DownloadResult

Method	Returns	Needs session?
tx.upload(path, **opts)	UploadResult	yes (lazily created)
tx.download(link, dir, **opts)	DownloadResult	no
tx.info(link, password=…)	list[TransferNode]	no
tx.metadata(link, password=…)	TransferInfo	no

upload() accepts every web-form field as a kwarg — title, message, password, sender, expiry (int seconds or duration string), notify_expiry, max_downloads, recipients, schedule, concurrency, and three progress callbacks (on_progress, on_file_start, on_file_done).

Typed returns

TransferInfo, TransferNode, UploadResult, DownloadResult are frozen dataclasses. Every one has a .to_json_dict() for serialisation; TransferNode also exposes .is_file / .is_folder. Raw server responses are kept on .raw as an escape hatch.

meta = tx.metadata(url)
print(meta.title, meta.total_bytes, meta.password_protected)

Progress hooks

def on_progress(sent: int, total: int) -> None:
    print(f"{sent/total:6.1%}  {sent:>12,} / {total:,} bytes")

tx.upload("./big.mp4", on_progress=on_progress)

tx.download exposes richer callbacks: on_start, on_file_start, on_file_progress, on_file_done, on_skip.

Defaults

Transferit(default_sender=…, default_expiry=…, default_concurrency=…) — any of these is used when a per-call kwarg is omitted.

Low-level

Advanced callers can use MegaAPI directly — every MEGA command (create_ephemeral_session, create_transfer, fetch_transfer, set_transfer_attributes, …) is a method on it. Inject via Transferit(api=MegaAPI(...)) for testing or pinning to an alternate endpoint.

How it works

transfer.it is a thin white-label on top of MEGA's bt7 API cluster. Each upload spins up an anonymous ephemeral MEGA account, creates a transfer container, streams AES-128-CTR-encrypted chunks over WebSockets (with CBC-MAC integrity checks), and finalises the node list via a proprietary x* command family. Full protocol reference — API verbs, crypto scheme, WebSocket framing, password derivation — lives in docs/REVERSE_ENGINEERING.md.

License

MIT — see LICENSE.

Disclaimer

transferit is an independent, community-maintained project. It is not affiliated with, endorsed by, sponsored by, or otherwise connected to MEGA Limited, transfer.it, or any of their subsidiaries. All product names, logos, and brands are property of their respective owners.

This project interoperates with transfer.it by re-implementing the publicly-served, client-side JavaScript that the official web client ships to every visitor — no proprietary SDK, no private endpoint, no circumvention of any access control. The protocol write-up in docs/REVERSE_ENGINEERING.md is provided purely for educational and interoperability purposes.

Before using transferit, make sure your usage complies with:

• transfer.it's terms of service
• MEGA's terms of service
• Any export-control, data-protection, or local laws that apply to you

You are solely responsible for the content you upload and the transfers you access through this library. The maintainers accept no liability for misuse, data loss, service disruption, account termination, or any other consequence arising from use of this software. The software is provided "as is", without warranty of any kind — see LICENSE for the full legal text.

If you are a rights-holder and believe this project infringes on your rights, please open an issue on the project's repository before taking any other action — most concerns can be resolved directly.