did

did is a Go package that provides tools to work with Decentralized Identifiers (DIDs).

Install

go get github.com/ockam-network/did

Example

package main

import (
	"fmt"
	"log"

	"github.com/ockam-network/did"
)

func main() {
	d, err := did.Parse("did:example:q7ckgxeq1lxmra0r")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("%#v", d)
}

The above example parses the input string according to the rules defined in the DID Grammar and prints the following value of DID type.

&did.DID{
	Method:"example",
	ID:"q7ckgxeq1lxmra0r",
	IDStrings:[]string{"q7ckgxeq1lxmra0r"},
	Path:"",
	PathSegments:[]string(nil),
	Query:"",
	Fragment:""
}

The input string may also be a DID Reference with a DID Path:

d, err := did.Parse("did:example:q7ckgxeq1lxmra0r/abc/pqr")

which would result in:

&did.DID{
	Method:"example",
	ID:"q7ckgxeq1lxmra0r",
	IDStrings:[]string{"q7ckgxeq1lxmra0r"},
	Path:"abc/pqr",
	PathSegments:[]string{"abc", "pqr"},
	Query:"",
	Fragment:""
}

or a DID Reference with a DID Path and a DID Query:

d, err := did.Parse("did:example:q7ckgxeq1lxmra0r/abc/pqr?xyz")
fmt.Println(d.Query)
// Output: xyz

or a DID Reference with a DID Fragment:

d, err := did.Parse("did:example:q7ckgxeq1lxmra0r#keys-1")
fmt.Println(d.Fragment)
// Output: keys-1

This package also implements the Stringer interface for the DID type. It is easy to convert DID type structures into valid DID strings:

d := &did.DID{Method: "example", ID: "q7ckgxeq1lxmra0r"}
fmt.Println(d.String())
// Output: did:example:q7ckgxeq1lxmra0r

or with a refence with a fragment:

d := &did.DID{Method: "example", ID: "q7ckgxeq1lxmra0r", Fragment: "keys-1"}
fmt.Println(d.String())
// Output: did:example:q7ckgxeq1lxmra0r#keys-1

For more documentation and examples, please see godoc.

Build

To compile the code in this repository, run:

go build

Test

This repository includes a comprehensive suite of tests that check for various edge cases within the DID Grammar.

To run the tests, run:

go test -v -cover

Benchmark

We haven't spent any time tuning the performance of the parser, however this repository includes some benchmarks that compare the speed of did.Parse against Go's url.Parse with inputs of similar length, this is intended as a sanity check to ensure that did.Parse is at least comparable in performance to url.Parse

go test -bench=.

did.Parse included in this package:

BenchmarkParse-8                  	 5000000	       365 ns/op
BenchmarkParseWithPath-8          	 3000000	       500 ns/op
BenchmarkParseWithQuery-8         	 3000000	       558 ns/op
BenchmarkParseWithFragment-8      	 3000000	       552 ns/op

Go's url.Parse:

BenchmarkUrlParse-8               	 3000000	       475 ns/op
BenchmarkUrlParseWithPath-8       	 3000000	       505 ns/op
BenchmarkUrlParseWithQuery-8      	 5000000	       294 ns/op
BenchmarkUrlParseWithFragment-8   	 5000000	       369 ns/op

Contributing

This package is early in its development and we welcome all contributions from the DID community. Please open issues and send pull requests.

We follow the conventions specified in Conventional Commits for our commit messages.

License

This package is licensed under Apache License 2.0.