fix: support storing ArrayBuffers in conf (#1236)

I made a change to use ArrayBuffers in AgentDataExport, which was not
supported by our JSON.stringify function. Tweak the stringify replacer
to handle this cleanly and add a test to verify it works as expected.

packages/access-client/package.json

@@ -18,11 +18,11 @@
     "lint": "tsc --build && eslint '**/*.{js,ts}' && prettier --check '**/*.{js,ts,yml,json}' --ignore-path ../../.gitignore",
     "build": "tsc --build",
     "check": "tsc --build",
-    "test": "pnpm -r run build && npm run test:node && npm run test:browser",
+    "test": "pnpm -r run build && pnpm run test:node && pnpm run test:browser",
     "test:node": "mocha 'test/**/!(*.browser).test.js' -n experimental-vm-modules -n no-warnings",
     "test:browser": "playwright-test 'test/**/!(*.node).test.js'",
     "testw": "watch 'pnpm test' src test --interval 1",
-    "rc": "npm version prerelease --preid rc"
+    "rc": "pnpm version prerelease --preid rc"
   },
   "exports": {
     ".": {

packages/access-client/src/utils/json.js

@@ -11,6 +11,8 @@ export const replacer = (k, v) => {
     return { $map: [...v.entries()] }
   } else if (v instanceof Uint8Array) {
     return { $bytes: [...v.values()] }
+  } else if (v instanceof ArrayBuffer) {
+    return { $bytes: [...new Uint8Array(v).values()] }
   } else if (v?.type === 'Buffer' && Array.isArray(v.data)) {
     return { $bytes: v.data }
   }

packages/access-client/test/stores/store-conf.node.test.js

@@ -0,0 +1,78 @@
+import assert from 'assert'
+import { top } from '@web3-storage/capabilities/top'
+import { Signer as EdSigner } from '@ucanto/principal/ed25519'
+import * as RSASigner from '@ucanto/principal/rsa'
+import { AgentData } from '../../src/agent-data.js'
+import { StoreConf } from '../../src/stores/store-conf.js'
+
+describe('Conf store', () => {
+  it('should create and load data', async () => {
+    const data = await AgentData.create({
+      principal: await RSASigner.generate({ extractable: false }),
+    })
+
+    const store = new StoreConf({ profile: 'test-access-db-' + Date.now() })
+    await store.open()
+    await store.save(data.export())
+
+    const exportData = await store.load()
+    assert(exportData)
+
+    // no accounts or delegations yet
+    assert.equal(exportData.spaces.size, 0)
+    assert.equal(exportData.delegations.size, 0)
+
+    // default meta
+    assert.equal(exportData.meta.name, 'agent')
+    assert.equal(exportData.meta.type, 'device')
+  })
+
+  it('should round trip delegations', async () => {
+    const store = new StoreConf({ profile: 'test-access-db-' + Date.now() })
+    await store.open()
+
+    const data0 = await AgentData.create()
+    const signer = await EdSigner.generate()
+    const del0 = await top.delegate({
+      issuer: signer,
+      audience: data0.principal,
+      with: signer.did(),
+      expiration: Infinity,
+    })
+
+    await data0.addDelegation(del0, {
+      audience: { name: 'test', type: 'device' },
+    })
+    await store.save(data0.export())
+
+    const exportData1 = await store.load()
+    assert(exportData1)
+
+    const data1 = AgentData.fromExport(exportData1)
+
+    const { delegation: del1 } =
+      data1.delegations.get(del0.cid.toString()) ?? {}
+    assert(del1)
+    assert.equal(del1.cid.toString(), del0.cid.toString())
+    assert.equal(del1.issuer.did(), del0.issuer.did())
+    assert.equal(del1.audience.did(), del0.audience.did())
+    assert.equal(del1.capabilities[0].can, del0.capabilities[0].can)
+    assert.equal(del1.capabilities[0].with, del0.capabilities[0].with)
+  })
+
+  it('should be resettable', async () => {
+    const principal = await RSASigner.generate({ extractable: false })
+    const data = await AgentData.create({ principal })
+
+    const store = new StoreConf({ profile: 'test-access-db-' + Date.now() })
+    await store.open()
+    await store.save(data.export())
+
+    const exportData = await store.load()
+    assert.equal(exportData?.principal.id, principal.did())
+
+    await store.reset()
+    const resetExportData = await store.load()
+    assert.equal(resetExportData?.principal.id, undefined)
+  })
+})