WIP Add Nostr auth

app/services/nostr-auth.js

@@ -0,0 +1,60 @@
+import Service from '@ember/service';
+import { tracked } from '@glimmer/tracking';
+import { ExtensionSigner } from 'applesauce-signers';
+
+const STORAGE_KEY = 'marco:nostr_pubkey';
+
+export default class NostrAuthService extends Service {
+  @tracked pubkey = null;
+  signer = null;
+
+  constructor() {
+    super(...arguments);
+    const saved = localStorage.getItem(STORAGE_KEY);
+    if (saved) {
+      this.pubkey = saved;
+    }
+  }
+
+  get isConnected() {
+    return !!this.pubkey;
+  }
+
+  async login() {
+    if (typeof window.nostr === 'undefined') {
+      throw new Error('No NIP-07 Nostr extension found (e.g., Alby, nos2x).');
+    }
+
+    if (!this.signer) {
+      this.signer = new ExtensionSigner();
+    }
+
+    try {
+      this.pubkey = await this.signer.getPublicKey();
+      localStorage.setItem(STORAGE_KEY, this.pubkey);
+      return this.pubkey;
+    } catch (error) {
+      console.error('Failed to get public key from extension:', error);
+      throw error;
+    }
+  }
+
+  async signEvent(event) {
+    if (!this.signer) {
+      if (this.pubkey && typeof window.nostr !== 'undefined') {
+        this.signer = new ExtensionSigner();
+      } else {
+        throw new Error(
+          'Not connected or extension missing. Please connect Nostr again.'
+        );
+      }
+    }
+    return await this.signer.signEvent(event);
+  }
+
+  logout() {
+    this.pubkey = null;
+    this.signer = null;
+    localStorage.removeItem(STORAGE_KEY);
+  }
+}