CBOR-LD implementation for Rust

This library provides a Rust implementation of CBOR-LD, a compression format for JSON-LD based on the Concise Binary Object Representation (CBOR).

Usage

// Parse an input JSON-LD document.
let json: cbor_ld::JsonValue = include_str!("../tests/samples/note.jsonld").parse().unwrap();

// Create a JSON-LD context loader.
let mut context_loader = json_ld::loader::ReqwestLoader::new();

// Encode (compress) the JSON-LD document into CBOR-LD.
let encoded: cbor_ld::CborValue = cbor_ld::encode(&json, &mut context_loader).await.unwrap();

// Decode (decompress) the CBOR-LD document back into JSON-LD.
let decoded: cbor_ld::JsonValue = cbor_ld::decode(&encoded, &mut context_loader).await.unwrap();

// The input and decoded JSON values should be equal
// (modulo objects entries ordering and some compact IRI expansions).
use json_syntax::BorrowUnordered;
assert_eq!(json.as_unordered(), decoded.as_unordered())

Command-line interface

A command-line interface is provided to easily encode and decode CBOR-LD documents from the terminal.

Install & run

You can install the command-line interface using the bin feature:

cargo install --path . --features=bin

This will install a cbor-ld executable:

cbor-ld <args>

Alternatively you can directly run the command-line interface without installing it:

cargo run --features=bin -- <args>

Usage

Use the -h (--help) flag to display all the available commands and options:

cbor-ld -h

The executable provides two commands encode and decode to compress a JSON-LD document into CBOR-LD, and back.

cbor-ld encode path/to/input.jsonld > path/to/output.cbor

If no input file is given, the standard input will be used. Using the -x (--hexadecimal) option the CBOR input/output will be decoded/encoded as hexadecimal.

cbor-ld decode -x path/to/input.cbor.hex > path/to/output.jsonld

By default remote JSON-LD contexts will be fetched online. You can change this behavior by adding file-system endpoints for some URLs using the -m (--mount) option, and/or disable HTTP queries alltogether using the -o (--offline) flag.

cbor-ld --offline -m "https://www.w3.org/ns/credentials=tests/contexts/credentials" decode path/to/input.cbor > path/to/output.jsonld

These options can also be provided using a TOML configuration files using the -f (--config) option.

cbor-ld -f path/to/config.toml encode path/to/input.jsonld > path/to/output.cbor

An example configuration file is provided at tests/config.toml.

Funding

This work is funded in part by the U.S. Department of Homeland Security's Science and Technology Directorate under contract 70RSAT24T00000011 (Open-Source and Privacy-Preserving Digital Credentialing Infrastructure). Through this contract, SpruceID’s open-source libraries will be used to build privacy-preserving digital credential wallets and verifier capabilities to support standards while ensuring safe usage and interoperability across sectors like finance, healthcare, and various cross-border applications. To learn more about this work, read more here .