transbeam

A low-latency file drop web app

features

• One-to-many transfer of large files
• Simple web UI for sender and receivers
• Word-based download codes that are easy to remember and communicate
• Receivers can begin downloading immediately, without needing to wait for the upload to finish
• Receivers can also download after the upload is complete and the sender has gone offline
• Easy to send multiple files at once - they're bundled into a zip file for receivers, with zero compression so extraction is quick
• Can also download individual files out of an uploaded collection
• Sanitises filenames, using sensible non-obnoxious defaults that should be safe across platforms
• Rudimentary password authentication for uploading files
• Fires a laser beam that turns you trans

configuration

transbeam is configured with the following environment variables:

• TRANSBEAM_STORAGE_DIR: path where uploaded files should be stored (default: ./storage)
• TRANSBEAM_STATIC_DIR: path where the web app's static files live (default: ./static)
• TRANSBEAM_BASE_URL: base URL for this transbeam instance, without trailing /
• TRANSBEAM_PORT: port to listen on localhost for http requests (default: 8080)
• TRANSBEAM_REVERSE_PROXY: whether transbeam is running behind a reverse proxy (recommended), or directly exposed to the internet. If true, transbeam will only bind to localhost, and will use the Forwarded or X-Forwarded-For headers to determine client IP addresses for logs. If false, transbeam will bind on all interfaces, and will always log the peer IP address. (default: true)
• TRANSBEAM_MAX_LIFETIME: maximum number of days files can be kept for (default: 30)
• TRANSBEAM_MAX_UPLOAD_SIZE: maximum size of a fileset being uploaded (default: 16G)
• TRANSBEAM_MAX_STORAGE_SIZE: maximum total size of all files being stored by transbeam (default: 64G)
• TRANSBEAM_MNEMONIC_CODES: generate memorable download codes using English words, rather than random alphanumeric strings (default: true)
• TRANSBEAM_UPLOAD_PASSWORD: password for uploading files. This isn't meant to be a hardcore security measure, just a defense against casual internet randos filling up your storage. I strongly recommend setting up fail2ban to throttle password attempts; transbeam logs failed attempts along with IP addresses, in the form Incorrect authentication attempt from 203.0.113.12.
• TRANSBEAM_CACHEBUSTER: query string that will be appended to CSS and JS files, to force re-fetching of cached files when needed.
• RUST_LOG: log levels, for the app as a whole and/or for specific submodules/libraries. See env_logger's documentation for details.

running

nix flakes

nix run git+https://git.xeno.science/xenofem/transbeam?ref=main

(The Nix package is wrapped with TRANSBEAM_STATIC_DIR set automatically to the correct Nix store path, so it'll serve the static files properly no matter what directory you run it from. TRANSBEAM_CACHEBUSTER is set automatically to a hash of the static files' store path, so it will change whenever the static files change.)

non-nix

git clone https://git.xeno.science/xenofem/transbeam
cd transbeam
cargo run --release