feat: outbox model for the following feed

src/providers/NostrProvider/npub.signer.ts

@@ -0,0 +1,34 @@
+import { ISigner } from '@/types'
+import { nip19 } from 'nostr-tools'
+
+export class NpubSigner implements ISigner {
+  private pubkey: string | null = null
+
+  login(npub: string) {
+    const { type, data } = nip19.decode(npub)
+    if (type !== 'npub') {
+      throw new Error('invalid nsec')
+    }
+    this.pubkey = data
+    return this.pubkey
+  }
+
+  async getPublicKey() {
+    if (!this.pubkey) {
+      throw new Error('Not logged in')
+    }
+    return this.pubkey
+  }
+
+  async signEvent(): Promise<any> {
+    throw new Error('Not logged in')
+  }
+
+  async nip04Encrypt(): Promise<any> {
+    throw new Error('Not logged in')
+  }
+
+  async nip04Decrypt(): Promise<any> {
+    throw new Error('Not logged in')
+  }
+}