feat: add exportedBy to useSigitMeta

src/hooks/useSigitMeta.tsx

@@ -33,6 +33,10 @@ export interface FlatMeta
   // Remove pubkey and use submittedBy as `npub1${string}`
   submittedBy?: `npub1${string}`
 
+  // Optional field only present on exported sigits
+  // Exporting adds user's pubkey
+  exportedBy?: `npub1${string}`
+
   // Remove created_at and replace with createdAt
   createdAt?: number
 
@@ -68,6 +72,7 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
   const [tags, setTags] = useState<string[][]>()
   const [createdAt, setCreatedAt] = useState<number>()
   const [submittedBy, setSubmittedBy] = useState<`npub1${string}`>() // submittedBy, pubkey from nostr event
+  const [exportedBy, setExportedBy] = useState<`npub1${string}`>() // pubkey from export signature nostr event
   const [id, setId] = useState<string>()
   const [sig, setSig] = useState<string>()
 
@@ -99,6 +104,18 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
     if (!meta) return
     ;(async function () {
       try {
+        if (meta.exportSignature) {
+          const exportSignatureEvent = await parseNostrEvent(
+            meta.exportSignature
+          )
+          if (
+            verifyEvent(exportSignatureEvent) &&
+            exportSignatureEvent.pubkey
+          ) {
+            setExportedBy(exportSignatureEvent.pubkey as `npub1${string}`)
+          }
+        }
+
         const createSignatureEvent = await parseNostrEvent(meta.createSignature)
 
         const { kind, tags, created_at, pubkey, id, sig, content } =
@@ -265,6 +282,7 @@ export const useSigitMeta = (meta: Meta): FlatMeta => {
     tags,
     createdAt,
     submittedBy,
+    exportedBy,
     id,
     sig,
     signers,