An implementation of the Spring 83 protocol.

Very much a work-in-progress. This was built in reference to draft-20220616.md@0f63d3d2.

Requires node.js 16 or greater.

$ npm install

Robin has a truly impressive client available online here (GitHub). It is the ideal way to view and post boards from and to multiple S83 hosts. His host is running at https://bogbody.biz.

This implementation is running at https://0l0.lol and https://spring83.rkas.net. If you'd like to be listed here, just send mail to include-my-key@0l0.lol with your hex public key as the subject, or submit a PR with your key added to public-boards.json.

Runs a Spring-83 server on port specified by environment variable SPRING83_BIND_PORT (or 1783 by default) & binding to SPRING83_BIND_HOST (or localhost by default).

Writes boards into SPRING83_CONTENT_DIR (or ./.content by default).

If Docker is available, an image is published to Docker Hub as 0l0lol/serve or serve can be run from this repo directly: docker compose up --build -d serve.

See DEPLOYMENT.md.

This implementation supports an early and limited form of server federation per the discussion on Issue #6.

Federation will not work correctly on your instance unless you have:

• specified SPRING83_FQDN correctly for your setup and
• added that FQDN to constants.federate.knownS83Hosts

Any incoming PUT request with either:

• a Via header
• a <meta name="spring:share" content="false"> tag in the body

will NOT be queued for federation. putnew (detailed below) adds this meta tag by default, behavior that can be disabled with --share true.

The response to a successful PUT request that lacks one of the above will include the spring-federated-to header, the value of which is a comma-separated list of external hosts that the board has been queued to be shared with.

This server implements an extension to the (current) protocol: POST /key.

Accepting exactly the same body & header set as PUT /key (plus an additional optional header, detailed below), this endpoint will minify the board & auto-shorten any HTTP(S) links it finds, returning the resulting document to be re-signed and PUT normally by the user in possesion of the private key matching key. It does not modify anything server-side, only transforming and returning the original request body.

Either (or both, though what's the point of that) behaviors can be disabled via the Spring-Shortener-Disable header, a comma-separated list of behavior to disable. The values for these are: shorten-links, and minify. Additionally, the value shorten-board-links can be included to disable shortening links to other Springboards, ensuring they can render inline as expected in clients such as the Follower Sentinel.

The following endpoints generate a QR code of the specified Spring '83 public key, by default with no adornment.

For image/png:

• GET /key with Content-Type: image/png or
• GET /key.png

For text/html with live decode example:

• GET /qrcode/key

• full — presence of this option generates a QR code with the full URL, not just the key.
• springHost — the Spring '83 host to generate a QR code, defaults to this host. Just the hostname (no protocol scheme "http://").

Equivalent:

• curl https://0l0.lol/f539c49d389b1e141c97450cdabc83d41615303106c07f63c8975b5dc83e0623.png
• curl -H 'Content-type: image/png' https://0l0.lol/f539c49d389b1e141c97450cdabc83d41615303106c07f63c8975b5dc83e0623

Different hosts:

• https://0l0.lol/f539c49d389b1e141c97450cdabc83d41615303106c07f63c8975b5dc83e0623.png?full&springHost=bogbody.biz
• https://0l0.lol/f539c49d389b1e141c97450cdabc83d41615303106c07f63c8975b5dc83e0623.png?full&springHost=spring83.kindrobot.ca

Live-decode HTML:

• https://0l0.lol/qrcode/f539c49d389b1e141c97450cdabc83d41615303106c07f63c8975b5dc83e0623?full&springHost=bogbody.biz

To put a single board:    putnew host privKeyHex htmlFile
To put a path of boards:  putnew boardPath hostsCommaSeperated

Boards will be minified & have HTTP(S) links shortened by default (except Springboard links).
Pass --no-minify and/or --no-shorten to disable these behaviors.
To also shorten Springboard links, pass --shortenBoardLinks true

By default, boards will be marked to NOT be shared with other federated hosts.
        This adds at least 42 bytes.
To instead mark your board to be shared, pass: --share true

Available on Docker Hub as 0l0lol/putnew to enable usage without needing node locally, like so:

$ docker run -it --rm -v $PWD:/home 0l0lol/putnew:latest ...

Operates in two modes: single board PUT or multi-board PUT.

Puts a new board with HTML source htmlFile to host with private key (in hex) privKeyHex.

Will insert the required <time datetime="..."> tag, with the appropriate datetime value, if it doesn't exist in the document already.

An example via the Docker Hub image:

$ docker run -it --rm -v $PWD:/home 0l0lol/putnew:latest https://0l0.lol ... f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623.html
f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623.html: appended <time>, which added 84 bytes
f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623.html: minified 4% (5 bytes) -> 107 total
https://0l0.lol PUT https://0l0.lol/f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623 200

Expects boardPath to be a directory containing board HTML files named with their full hex public key, and keypair files named according to the canonical pattern. So for example, a path named ./my-boards with the following contents is valid (assuming the keypair files are valid of course):

1b30ed15e51e6faa3afb3605212d8cdb80177dfedc30a0d0939d26ec683e1023.html
977b0a43de51225240128101105f0397cb2cde59801a74c40ad99c69183e0423.html
spring-83-keypair-2022-06-19-1b30ed15e51e.txt
spring-83-keypair-2022-06-19-977b0a43de51.txt

If putnew is then invoked like so:

$ putnew ./my-boards https://bogbody.biz,https://0l0.lol

it will post both boards to both listed hosts.

An example via the Docker Hub image:

$ docker run -it --rm -v $PWD:/home 0l0lol/putnew:latest ./dockerTest/ https://0l0.lol
Posting 1 boards to: https://0l0.lol
f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623.html: appended <time>, which added 83 bytes
f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623.html: minified 4% (5 bytes) -> 107 total
https://0l0.lol PUT https://0l0.lol/f13571200686a9a1bae0952bf2b741e6ad4fb84082ad02cebd32fa8ea83e0623 200

Update: This script is left in the repo for posterity, but PT's Go keyfinder is much faster and generates canonically-formatted keys as well. It's what I'm using now.

Randomly generates Ed25519 key pairs until one matching the specified format has been found.

If called with --strict, will only return when a key pair is found that is valid this calendar year.

The output format matches the format that the client and will be named in the same format.

Contributions are encouraged & welcomed! See CONTRIBUTING.md for process information.

MIT License

Copyright (c) 2022 Ryan Joseph & contributors