feat: attribute files and downloads to actors (#559)

* feat: attribute files and downloads to actors

* chore: refresh preview after staging migration

* fix: use a dash for missing actor identity

* fix: complete actor attribution and file creator UI

* fix: refine file creator identity UI

server/middleware/platform.ts

@@ -5,7 +5,7 @@ import type { DavLock } from '../domain/webdav'
 import type { WebDavMountPath } from '../domain/webdav-public-url'
 import type { Platform } from '../platform/interface'
 import type { Deps } from '../usecases/deps'
-import type { WebDavTarget } from '../usecases/ports'
+import type { ActorIdentity, WebDavTarget } from '../usecases/ports'
 import type { TransferAuditTarget } from '../usecases/transfer-activity'
 
 export type Env = {
@@ -157,6 +157,15 @@ export function boundWorkspaceOrgId(context: AuthzContext): string | null {
   return context.workspace.mode === 'bound' ? context.workspace.orgId : null
 }
 
+export function authzActorIdentity(context: AuthzContext): ActorIdentity | null {
+  if (!context.actor) return null
+  return {
+    type: context.actor.type,
+    ref: context.actor.ref,
+    issuer: 'issuer' in context.actor ? context.actor.issuer : null,
+  }
+}
+
 export const anonymousAuthzContext = (): AuthzContext => ({
   credential: 'anonymous',
   userId: null,