Add documentLoader and update zcap context.

digitalbazaar · Apr 26, 2021 · f16ad79 · f16ad79
1 parent 4b18be3
commit f16ad79
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Showing 3 changed files with 55 additions and 6 deletions.
diff --git a/lib/kms.js b/lib/kms.js
@@ -77,6 +77,9 @@ exports.generateKey = async (
   } else if(type === 'Ed25519VerificationKey2018') {
     type = 'Ed25519VerificationKey2018';
     Class = AsymmetricKey;
+  } else if(type === 'Ed25519VerificationKey2020') {
+    type = 'Ed25519VerificationKey2020';
+    Class = AsymmetricKey;
   } else if(type === 'keyAgreement' || type === 'X25519KeyAgreementKey2019') {
     type = 'X25519KeyAgreementKey2019';
     Class = KeyAgreementKey;

diff --git a/lib/zcaps.js b/lib/zcaps.js
@@ -4,19 +4,55 @@
 'use strict';
 
 const {CapabilityDelegation} = require('ocapld');
+const context2018 = require('ed25519-signature-2018-context');
+const context2020 = require('ed25519-signature-2020-context');
 const {EdvClient} = require('edv-client');
-const jsigs = require('jsonld-signatures');
 const {Ed25519Signature2018} = require('@digitalbazaar/ed25519-signature-2018');
 const {Ed25519Signature2020} = require('@digitalbazaar/ed25519-signature-2020');
+const {
+  documentLoaderFactory,
+  contexts,
+} = require('@transmute/jsonld-document-loader');
+const {sign, SECURITY_CONTEXT_V2_URL} = require('jsonld-signatures');
 
-const {SECURITY_CONTEXT_V2_URL, sign} = jsigs;
+const {constants: {CONTEXT_URL: CONTEXT_URL_2018}} = context2018;
+const {constants: {CONTEXT_URL: CONTEXT_URL_2020}} = context2020;
+
+const v1 = require('did-veres-one');
+const veresDriver = v1.driver();
+const didKeyDriver = require('did-method-key').driver();
 
 const SUPPORTED_KEY_TYPES = [
   'Ed25519VerificationKey2018',
   'Ed25519VerificationKey2020',
   'Sha256HmacKey2019',
   'X25519KeyAgreementKey2019'
 ];
+const createDocumentLoader = ({signer}) => {
+  let contextsValue;
+  if(signer.type === 'Ed25519VerificationKey2018') {
+    contextsValue = {
+      ...contexts.W3ID_Security_Vocabulary,
+      SECURITY_CONTEXT_V2_URL,
+      'https://w3id.org/security/ed25519-signature-2018/v1': context2018
+        .contexts.get('https://w3id.org/security/ed25519-signature-2018/v1')
+    };
+  } else if(signer.type === 'Ed25519VerificationKey2020') {
+    contextsValue = {
+      'https://w3id.org/security/ed25519-signature-2020/v1': context2020
+        .contexts.get('https://w3id.org/security/ed25519-signature-2020/v1')
+    };
+  }
+  return documentLoaderFactory.pluginFactory.build({contexts: contextsValue})
+    .addResolver({
+      ['did:key']: {
+        resolve: did => didKeyDriver.get({did})
+      },
+      ['did:v1']: {
+        resolve: did => veresDriver.get({did})
+      }
+    }).buildDocumentLoader();
+};
 
 exports.delegateCapability = async (
   {signer, keystoreAgent, edvClient, request} = {}) => {
@@ -30,8 +66,14 @@ exports.delegateCapability = async (
       '"invocationTarget" must be an object that includes a "type".');
   }
   // TODO: Look into requiring an invoker or controller on a zcap
+  let contextUrl;
+  if(signer.type === 'Ed25519VerificationKey2018') {
+    contextUrl = [SECURITY_CONTEXT_V2_URL, CONTEXT_URL_2018];
+  } else if(signer.type === 'Ed25519VerificationKey2020') {
+    contextUrl = CONTEXT_URL_2020;
+  }
   let zcap = {
-    '@context': SECURITY_CONTEXT_V2_URL,
+    '@context': contextUrl,
     // use 128-bit random multibase encoded value
     id: await exports.id()
   };
@@ -206,6 +248,7 @@ exports.delegate = async ({zcap, signer, capabilityChain}) => {
     purpose: new CapabilityDelegation({
       capabilityChain
     }),
-    compactProof: false
+    compactProof: false,
+    documentLoader: createDocumentLoader({signer})
   });
 };
diff --git a/package.json b/package.json
@@ -23,15 +23,18 @@
   },
   "homepage": "https://github.com/digitalbazaar/bedrock-profile",
   "dependencies": {
+    "@digitalbazaar/ed25519-signature-2018": "github:digitalbazaar/@digitalbazaar/ed25519-signature-2018#initial",
+    "@digitalbazaar/ed25519-signature-2020": "github:digitalbazaar/@digitalbazaar/ed25519-signature-2020#initial",
+    "@transmute/jsonld-document-loader": "^0.2.0",
     "assert-plus": "^1.0.0",
     "base64url-universal": "^1.1.0",
     "crypto-ld": "^3.7.0",
     "did-method-key": "^0.7.0",
     "did-veres-one": "^12.1.1",
+    "ed25519-signature-2018-context": "github:digitalbazaar/@digitalbazaar/ed25519-signature-2018-context#initial",
+    "ed25519-signature-2020-context": "github:digitalbazaar/@digitalbazaar/ed25519-signature-2020-context#initial",
     "edv-client": "^6.0.1",
     "jsonld-signatures": "^5.1.0",
-    "@digitalbazaar/ed25519-signature-2018": "github:digitalbazaar/@digitalbazaar/ed25519-signature-2018#initial",
-    "@digitalbazaar/ed25519-signature-2020": "github:digitalbazaar/@digitalbazaar/ed25519-signature-2020#initial",
     "ocapld": "^2.0.0",
     "webkms-client": "^3.0.0"
   },