fix: sync space names from proofs (storacha#1193)

space names are stored as facts in proofs in the special `ucan:*`
delegation from email to agent e.g.

```yaml
iss: did:mailto:protocol.ai:oli
att:
  - can: *
    with: ucan:*
fct:
  - {"access/confirm":{"/":"bafyreidadrwbxueiuhtbph2tj2m7a6nizpx7sbtqotbfkkjsoytn3dg2t4"},"access/request":{"/":"bafyreigmlliovbpxka2borbdaw6zpsai4qzmzv5nv7syl7nagecxjcub6e"}}
prf:
  - {"iss":"did:key:z6Mku56ywWspVnzkcVQbeSkw6egVRSNKVSYgS38HhKcUJRiN","aud":"did:mailto:protocol.ai:oli","v":"0.9.1","s":{"/":{"bytes":"7aEDQPgUVQFVOoLmijx8O7Li9zyc7iIHEDnCwiqr+LcV9CyHd/KzUg1Ige7Okh+ipVMOKy2EvG8dGjWfsdAAbUVPMwo"}},"exp":null,"att":[{"can":"*","with":"did:key:z6Mku56ywWspVnzkcVQbeSkw6egVRSNKVSYgS38HhKcUJRiN"}],"fct":[{"space":{"name":"fruits"}}],"prf":[],"/":"bafyreihhlz5yjci6h7vdrlgn5xnyc65e3unp3dx2yrspepwoftaxszxpxa"}
```

this will be fixed more robustly by the proposed re-imagining of the
client as a stateless view over the stored ucans, but i'd like to land
this fix asap, as it's currently you dont' get to see your existing
space names when calling login in a new agent.

fixes: storacha#1176

License: MIT

---------

Signed-off-by: Oli Evans <oli@protocol.ai>

packages/access-client/src/agent.js

@@ -7,7 +7,14 @@ import { attest } from '@web3-storage/capabilities/ucan'
 import * as Access from './access.js'
 import * as Space from './space.js'
 
-import { invoke, delegate, DID, Delegation, Schema } from '@ucanto/core'
+import {
+  invoke,
+  delegate,
+  DID,
+  Delegation,
+  Schema,
+  isDelegation,
+} from '@ucanto/core'
 import { isExpired, isTooEarly, canDelegateCapability } from './delegations.js'
 import { AgentData, getSessionProofs } from './agent-data.js'
 import { UCAN } from '@web3-storage/capabilities'
@@ -621,24 +628,45 @@ export async function addSpacesFromDelegations(agent, delegations) {
     })
   }
 
-  for (const delegation of delegations) {
-    // We only consider delegations to this agent as those are only spaces that
-    // this agent will be able to interact with.
-    if (delegation.audience.did() === agent.did()) {
-      // TODO: we need a more robust way to determine which spaces a user has access to
-      // it may or may not involve look at delegations
-      const allows = ucanto.Delegation.allows(delegation)
-
-      for (const [did, value] of Object.entries(allows)) {
-        // If we discovered a delegation to any DID, we add it to the spaces list.
-        if (did.startsWith('did:key') && Object.keys(value).length > 0) {
-          await data.addSpace(/** @type {API.DID} */ (did), {
-            name: '',
-          })
+  // spaces we find along the way.
+  const spaces = new Map()
+  // only consider ucans with this agent as the audience
+  const ours = delegations.filter((x) => x.audience.did() === agent.did())
+  // space names are stored as facts in proofs in the special `ucan:*` delegation from email to agent.
+  const ucanStars = ours.filter(
+    (x) => x.capabilities[0].can === '*' && x.capabilities[0].with === 'ucan:*'
+  )
+  for (const delegation of ucanStars) {
+    for (const proof of delegation.proofs) {
+      if (
+        !isDelegation(proof) ||
+        !proof.capabilities[0].with.startsWith('did:key')
+      ) {
+        continue
+      }
+      const space = Space.fromDelegation(proof)
+      spaces.set(space.did(), space.meta)
+    }
+  }
+
+  // Find any other spaces the user may have access to
+  for (const delegation of ours) {
+    // TODO: we need a more robust way to determine which spaces a user has access to
+    // it may or may not involve look at delegations
+    const allows = ucanto.Delegation.allows(delegation)
+    for (const [resource, value] of Object.entries(allows)) {
+      // If we discovered a delegation to any DID, we add it to the spaces list.
+      if (resource.startsWith('did:key') && Object.keys(value).length > 0) {
+        if (!spaces.has(resource)) {
+          spaces.set(resource, {})
         }
       }
     }
   }
+
+  for (const [did, meta] of spaces) {
+    await data.addSpace(did, meta)
+  }
 }
 
 /**