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PeerDIDResolver.ts
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PeerDIDResolver.ts
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import { CastorError } from "../../domain/models/Errors";
import { MultiCodec, Codec } from "../../peer-did/helpers/Multicodec";
import { PeerDIDService } from "../../peer-did/PeerDID";
import {
VerificationMaterialFormatPeerDID,
VerificationMaterialAuthentication,
VerificationMaterialAgreement,
VerificationMaterialPeerDID,
VerificationMethodTypeAgreement,
VerificationMethodTypeAuthentication,
Numalgo2Prefix,
} from "../../peer-did/types";
import { base58btc } from "multiformats/bases/base58";
import {
DID,
DIDDocument,
DIDResolver,
VerificationMethod,
Service as DIDDocumentService,
DIDUrl,
ServiceEndpoint,
VerificationMethods,
Authentication as DIDDocumentAuthentication,
KeyAgreement as DIDDocumentKeyAgreement,
Services as DIDDocumentServices,
} from "../../domain/models";
import { JWKHelper } from "../../peer-did/helpers/JWKHelper";
import * as base64 from "multiformats/bases/base64";
export class PeerDIDResolver implements DIDResolver {
method = "peer";
async resolve(didString: string): Promise<DIDDocument> {
const did = DID.fromString(didString);
if (did.method !== "peer" || did.methodId.slice(0, 1) !== "2") {
throw new CastorError.NotPossibleToResolveDID();
}
return this.buildDIDDocumentAlgo2(
did,
VerificationMaterialFormatPeerDID.JWK
);
}
private buildDIDDocumentAlgo2(
did: DID,
format: VerificationMaterialFormatPeerDID
): DIDDocument {
const composition = did.methodId.split(".").slice(1);
const authenticationMethods: VerificationMethod[] = [];
const keyAgreementMethods: VerificationMethod[] = [];
const services: DIDDocumentService[] = [];
composition.forEach((part) => {
let decoded: [
string,
VerificationMaterialAuthentication | VerificationMaterialAgreement,
];
const type = part.slice(0, 1);
switch (type) {
case Numalgo2Prefix.authentication:
decoded = this.decodeMultibaseEncnumbasisAuth(part.slice(1), format);
authenticationMethods.push(this.getVerificationMethod(did, decoded));
break;
case Numalgo2Prefix.keyAgreement:
decoded = this.decodeMultibaseEcnumbasisAgreement(
part.slice(1),
format
);
keyAgreementMethods.push(this.getVerificationMethod(did, decoded));
break;
case Numalgo2Prefix.service:
services.push(...this.decodeService(did, part.slice(1)));
}
});
return new DIDDocument(did, [
new VerificationMethods([
...authenticationMethods,
...keyAgreementMethods,
]),
new DIDDocumentAuthentication(
authenticationMethods.map(({ id }) => id),
authenticationMethods
),
new DIDDocumentKeyAgreement(
keyAgreementMethods.map(({ id }) => id),
keyAgreementMethods
),
new DIDDocumentServices(services),
]);
}
public decodeMultibaseEncnumbasisAuth(
multibase: string,
format: VerificationMaterialFormatPeerDID
): [string, VerificationMaterialAuthentication] {
const [decoded, verMaterial] = this.decodeMultibaseEncnumbasis(
multibase,
format,
Codec.ed25519
);
if (
!(verMaterial instanceof VerificationMaterialAuthentication) ||
!verMaterial.authentication
) {
throw new CastorError.NotPossibleToResolveDID();
}
return [decoded, verMaterial.authentication];
}
public decodeMultibaseEcnumbasisAgreement(
multibase: string,
format: VerificationMaterialFormatPeerDID
): [string, VerificationMaterialAgreement] {
const [decoded, verMaterial] = this.decodeMultibaseEncnumbasis(
multibase,
format,
Codec.x25519
);
if (
!(verMaterial instanceof VerificationMaterialAgreement) ||
!verMaterial.agreement
) {
throw new CastorError.NotPossibleToResolveDID();
}
return [decoded, verMaterial.agreement];
}
public decodeMultibaseEncnumbasis(
multibase: string,
format: VerificationMaterialFormatPeerDID,
defaultCodec: Codec
): [string, VerificationMaterialPeerDID] {
const [encnum, encnumData] = this.fromBase58Multibase(multibase);
const [codec, decodedEncnum] = new MultiCodec(encnumData).decode(
defaultCodec
);
this.validateRawKeyLength(decodedEncnum);
if (format !== VerificationMaterialFormatPeerDID.JWK) {
throw new Error("Not implemented");
}
if (codec === Codec.x25519) {
try {
const jwkJsonString = JWKHelper.toJWK(
decodedEncnum,
VerificationMethodTypeAgreement.JSON_WEB_KEY_2020
);
return [
encnum,
new VerificationMaterialAgreement(
jwkJsonString,
VerificationMethodTypeAgreement.JSON_WEB_KEY_2020,
format
),
];
} catch (err) {
throw new CastorError.InvalidJWKKeysError();
}
} else if (codec === Codec.ed25519) {
try {
const jwkJsonString = JWKHelper.toJWK(
decodedEncnum,
VerificationMethodTypeAuthentication.JSON_WEB_KEY_2020
);
return [
encnum,
new VerificationMaterialAuthentication(
jwkJsonString,
VerificationMethodTypeAuthentication.JSON_WEB_KEY_2020,
format
),
];
} catch (err) {
throw new CastorError.InvalidJWKKeysError();
}
}
throw new Error("Not implemented");
}
public fromBase58Multibase(multibase: string): [string, Uint8Array] {
const multibaseDecoded = base58btc.decode(multibase);
return [multibase.slice(1), multibaseDecoded];
}
public getVerificationMethod(
did: DID,
decodedEncnumbasis: [string, VerificationMaterialPeerDID]
): VerificationMethod {
const jsonObject = JSON.parse(decodedEncnumbasis[1].value);
jsonObject["kid"] = did.toString() + "#" + decodedEncnumbasis[0];
return {
id: new DIDUrl(did, [], new Map(), decodedEncnumbasis[0]).string(),
controller: did.toString(),
type: decodedEncnumbasis[1].keyType.value,
publicKeyJwk: jsonObject,
};
}
public decodeService(did: DID, encodedString: string): DIDDocumentService[] {
let jsonData: Buffer;
try {
const base64State = base64.base64url.decode(`u${encodedString}`);
jsonData = Buffer.from(base64State);
const serviceList = JSON.parse(jsonData.toString());
const services = (
Array.isArray(serviceList) ? serviceList : [serviceList]
).map((service) => PeerDIDService.decode(service));
const didcommServices = services.map((service, offset) => {
return new DIDDocumentService(
did.toString() + "#" + service.type + "-" + offset,
[service.type],
new ServiceEndpoint(
service.serviceEndpoint,
service.accept,
service.routingKeys
)
);
});
return didcommServices;
} catch (e) {
throw new CastorError.NotPossibleToResolveDID();
}
}
public validateRawKeyLength(key: Uint8Array) {
if (key.length !== 32) {
throw new CastorError.InvalidKeyError();
}
}
}