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feat: forked web-did-resolver and refactored to be plc-did-resolver
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nickreynolds committed Apr 26, 2023
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# Web DID Resolver
# Plc DID Resolver

This library is intended to represent domains accessed through https as
[Decentralized Identifiers](https://w3c.github.io/did-core/#identifier)
This library is intended to resolve [PLC DIDs](https://atproto.com/specs/did-plc)
and retrieve an associated [DID Document](https://w3c.github.io/did-core/#did-document-properties)
from the "PLC Directory"

It supports the proposed [`did:web` method spec](https://w3c-ccg.github.io/did-method-web/) from
the [W3C Credentials Community Group](https://w3c-ccg.github.io).

It requires the `did-resolver` library, which is the primary interface for resolving DIDs.

## DID method

To encode a DID for an HTTPS domain, simply prepend `did:web:` to domain name.

eg: `https://example.com -> did:web:example.com`
This DID Method is not considered "decentralized" at all, and will likely be replaced in the future.

## DID Document

The DID resolver takes the domain and forms a [well-known URI](https://tools.ietf.org/html/rfc5785)
to access the DID Document.

For a did `did:web:example.com`, the resolver will attempt to access the document at
`https://example.com/.well-known/did.json`
The DID resolver takes the DID and retrieves a document from the PLC Directory associated with that DID.

A minimal DID Document might contain the following information:

```json
{
"@context": "https://w3id.org/did/v1",
"id": "did:web:example.com",
"publicKey": [
{
"id": "did:web:example.com#owner",
"type": "Secp256k1VerificationKey2018",
"controller": "did:web:example.com",
"publicKeyHex": "04ab0102bcae6c7c3a90b01a3879d9518081bc06123038488db9cb109b082a77d97ea3373e3dfde0eccd9adbdce11d0302ea5c098dbb0b310234c8689501749274"
}
],
"assertionMethod": [ "did:web:example.com#owner" ],
"authentication": [ "did:web:example.com#owner" ]
}
"@context": ["https://www.w3.org/ns/did/v1", "https://w3id.org/security/suites/secp256k1-2019/v1"],
"id": "did:plc:wuyiqd25zhsut5a2gc46iqoi",
"alsoKnownAs": ["at://okaynick.bsky.social"],
"verificationMethod": [{
"id": "#atproto",
"type": "EcdsaSecp256k1VerificationKey2019",
"controller": "did:plc:wuyiqd25zhsut5a2gc46iqoi",
"publicKeyMultibase": "zQYEBzXeuTM9UR3rfvNag6L3RNAs5pQZyYPsomTsgQhsxLdEgCrPTLgFna8yqCnxPpNT7DBk6Ym3dgPKNu86vt9GR"
}],
"service": [{
"id": "#atproto_pds",
"type": "AtprotoPersonalDataServer",
"serviceEndpoint": "https://bsky.social"
}]
}
```

Note: this example uses the `Secp256k1VerificationKey2018` type and an `publicKeyHex` as a publicKey entry, signaling
that this DID is claiming to control the private key associated with that publicKey.

## Resolving a DID document

The resolver presents a simple `resolver()` function that returns a ES6 Promise returning the DID document.

```js
import { Resolver } from 'did-resolver'
import { getResolver } from 'web-did-resolver'
import { getResolver } from 'plc-did-resolver'

const webResolver = getResolver()
const plcResolver = getResolver()

const didResolver = new Resolver({
...webResolver
...plcResolver
//...you can flatten multiple resolver methods into the Resolver
})

didResolver.resolve('did:web:uport.me').then(doc => console.log(doc))
didResolver.resolve('did:plc:wuyiqd25zhsut5a2gc46iqoi').then(doc => console.log(doc))

// You can also use ES7 async/await syntax
;(async () => {
const doc = await didResolver.resolve('did:web:uport.me')
const doc = await didResolver.resolve('did:plc:wuyiqd25zhsut5a2gc46iqoi')
console.log(doc)
})();
```
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