From 685d357573185357aef85fdb241ec57f64d2cfa4 Mon Sep 17 00:00:00 2001
From: Dorian <dorian@Dorians-MacBook-Air.local>
Date: Tue, 3 Mar 2026 21:02:53 +0000
Subject: [PATCH] feat(app): add Nostr identity login via NIP-07 browser
 extension

Create useNostrIdentity.ts composable with NIP-07 window.nostr API
integration (getPublicKey, signEvent, extension detection). Add npub
bech32 encoding to bech32.ts. Create NostrLogin.vue settings component
with login/logout, npub display with copy, and extension install guidance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .../src/components/settings/NostrLogin.vue    | 120 ++++++++++++++++++
 .../app/src/composables/useNostrIdentity.ts   | 119 +++++++++++++++++
 packages/app/src/utils/bech32.ts              |  28 ++++
 3 files changed, 267 insertions(+)
 create mode 100644 packages/app/src/components/settings/NostrLogin.vue
 create mode 100644 packages/app/src/composables/useNostrIdentity.ts

diff --git a/packages/app/src/components/settings/NostrLogin.vue b/packages/app/src/components/settings/NostrLogin.vue
new file mode 100644
index 00000000..656f0d21
--- /dev/null
+++ b/packages/app/src/components/settings/NostrLogin.vue
@@ -0,0 +1,120 @@
+<template>
+  <div class="space-y-3">
+    <h3 class="text-sm font-bold" :class="isDark ? 'text-white/90' : 'text-gray-900'">
+      Nostr Identity
+    </h3>
+
+    <!-- Logged in state -->
+    <div
+      v-if="isLoggedIn"
+      class="flex items-center gap-3 p-3 rounded-xl"
+      :class="isDark
+        ? 'bg-white/[0.03] border border-white/5'
+        : 'bg-black/[0.02] border border-black/5'"
+    >
+      <div class="w-8 h-8 rounded-full bg-purple-500/20 flex items-center justify-center">
+        <svg class="w-4 h-4 text-purple-400" viewBox="0 0 24 24" fill="currentColor">
+          <path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 3c1.66 0 3 1.34 3 3s-1.34 3-3 3-3-1.34-3-3 1.34-3 3-3zm0 14.2c-2.5 0-4.71-1.28-6-3.22.03-1.99 4-3.08 6-3.08 1.99 0 5.97 1.09 6 3.08-1.29 1.94-3.5 3.22-6 3.22z" />
+        </svg>
+      </div>
+      <div class="flex-1 min-w-0">
+        <div
+          class="text-xs font-medium"
+          :class="isDark ? 'text-white/80' : 'text-gray-800'"
+        >
+          Connected
+        </div>
+        <button
+          class="text-[10px] font-mono mt-0.5 hover:underline"
+          :class="isDark ? 'text-purple-400/60' : 'text-purple-600/60'"
+          @click="copyNpub"
+        >
+          {{ copied ? 'Copied!' : truncatedNpub }}
+        </button>
+      </div>
+      <button
+        class="text-[10px] px-2 py-1 rounded-md transition-colors"
+        :class="isDark
+          ? 'text-red-400/60 hover:text-red-400 hover:bg-red-500/10'
+          : 'text-red-500/60 hover:text-red-600 hover:bg-red-50'"
+        @click="logout"
+      >
+        Logout
+      </button>
+    </div>
+
+    <!-- Logged out state -->
+    <template v-else>
+      <button
+        v-if="isAvailable"
+        :disabled="isLoading"
+        class="w-full px-4 py-2.5 rounded-xl text-sm font-medium transition-all active:scale-[0.98]"
+        :class="isLoading
+          ? isDark
+            ? 'bg-purple-500/10 text-purple-400/40 cursor-wait'
+            : 'bg-purple-50 text-purple-300 cursor-wait'
+          : 'bg-purple-500/10 text-purple-400 hover:bg-purple-500/20'"
+        @click="login"
+      >
+        {{ isLoading ? 'Connecting...' : 'Login with Nostr' }}
+      </button>
+
+      <div
+        v-else
+        class="p-3 rounded-xl text-xs"
+        :class="isDark
+          ? 'bg-white/[0.03] border border-white/5 text-white/40'
+          : 'bg-black/[0.02] border border-black/5 text-gray-500'"
+      >
+        No Nostr extension detected. Install
+        <a
+          href="https://github.com/nicolgit/nos2x"
+          target="_blank"
+          rel="noopener noreferrer"
+          class="text-purple-400 hover:underline"
+        >nos2x</a>,
+        <a
+          href="https://getalby.com"
+          target="_blank"
+          rel="noopener noreferrer"
+          class="text-purple-400 hover:underline"
+        >Alby</a>, or another NIP-07 browser extension.
+      </div>
+    </template>
+
+    <!-- Error -->
+    <p
+      v-if="error"
+      class="text-[10px] text-red-400"
+    >
+      {{ error }}
+    </p>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref } from 'vue'
+import { useTheme } from '@/composables/useTheme'
+import { useNostrIdentity } from '@/composables/useNostrIdentity'
+
+const { isDark } = useTheme()
+const {
+  isAvailable,
+  isLoggedIn,
+  isLoading,
+  error,
+  npub,
+  truncatedNpub,
+  login,
+  logout,
+} = useNostrIdentity()
+
+const copied = ref(false)
+
+async function copyNpub() {
+  if (!npub.value) return
+  await navigator.clipboard.writeText(npub.value)
+  copied.value = true
+  setTimeout(() => { copied.value = false }, 2000)
+}
+</script>
diff --git a/packages/app/src/composables/useNostrIdentity.ts b/packages/app/src/composables/useNostrIdentity.ts
new file mode 100644
index 00000000..1bbc7efd
--- /dev/null
+++ b/packages/app/src/composables/useNostrIdentity.ts
@@ -0,0 +1,119 @@
+import { ref, computed, onMounted } from 'vue'
+import { encodeNpub } from '@/utils/bech32'
+
+/**
+ * NIP-07 browser extension interface (nos2x, Alby, etc.)
+ */
+interface NostrExtension {
+  getPublicKey(): Promise<string>
+  signEvent(event: UnsignedNostrEvent): Promise<SignedNostrEvent>
+  getRelays?(): Promise<Record<string, { read: boolean; write: boolean }>>
+  nip04?: {
+    encrypt(pubkey: string, plaintext: string): Promise<string>
+    decrypt(pubkey: string, ciphertext: string): Promise<string>
+  }
+}
+
+export interface UnsignedNostrEvent {
+  kind: number
+  created_at: number
+  tags: string[][]
+  content: string
+}
+
+export interface SignedNostrEvent extends UnsignedNostrEvent {
+  id: string
+  pubkey: string
+  sig: string
+}
+
+declare global {
+  interface Window {
+    nostr?: NostrExtension
+  }
+}
+
+const pubkey = ref<string | null>(null)
+const isAvailable = ref(false)
+const isLoading = ref(false)
+const error = ref<string | null>(null)
+
+export function useNostrIdentity() {
+  const npub = computed(() => {
+    if (!pubkey.value) return null
+    try {
+      return encodeNpub(pubkey.value)
+    } catch {
+      return null
+    }
+  })
+
+  const isLoggedIn = computed(() => !!pubkey.value)
+
+  const truncatedNpub = computed(() => {
+    if (!npub.value) return null
+    return npub.value.slice(0, 12) + '...' + npub.value.slice(-8)
+  })
+
+  function checkAvailability() {
+    isAvailable.value = typeof window !== 'undefined' && !!window.nostr
+  }
+
+  async function login(): Promise<void> {
+    error.value = null
+    if (!window.nostr) {
+      error.value = 'No Nostr extension detected. Install nos2x, Alby, or another NIP-07 extension.'
+      return
+    }
+
+    isLoading.value = true
+    try {
+      const pk = await window.nostr.getPublicKey()
+      pubkey.value = pk
+    } catch (e) {
+      error.value = e instanceof Error ? e.message : 'Failed to get public key'
+    } finally {
+      isLoading.value = false
+    }
+  }
+
+  async function signEvent(event: UnsignedNostrEvent): Promise<SignedNostrEvent | null> {
+    error.value = null
+    if (!window.nostr) {
+      error.value = 'No Nostr extension detected'
+      return null
+    }
+
+    try {
+      return await window.nostr.signEvent(event)
+    } catch (e) {
+      error.value = e instanceof Error ? e.message : 'Failed to sign event'
+      return null
+    }
+  }
+
+  function logout() {
+    pubkey.value = null
+    error.value = null
+  }
+
+  onMounted(() => {
+    checkAvailability()
+    // Some extensions load async — recheck after a short delay
+    setTimeout(checkAvailability, 500)
+  })
+
+  return {
+    pubkey,
+    npub,
+    isAvailable,
+    isLoggedIn,
+    isLoading,
+    error,
+    truncatedNpub,
+    login,
+    logout,
+    signEvent,
+    checkAvailability,
+  }
+}
diff --git a/packages/app/src/utils/bech32.ts b/packages/app/src/utils/bech32.ts
index 1c54c902..40965549 100644
--- a/packages/app/src/utils/bech32.ts
+++ b/packages/app/src/utils/bech32.ts
@@ -81,6 +81,34 @@ export function bytesToHex(bytes: Uint8Array): string {
   return Array.from(bytes).map(b => b.toString(16).padStart(2, '0')).join('')
 }
 
+export function hexToBytes(hex: string): Uint8Array {
+  const bytes = new Uint8Array(hex.length / 2)
+  for (let i = 0; i < hex.length; i += 2) {
+    bytes[i / 2] = parseInt(hex.slice(i, i + 2), 16)
+  }
+  return bytes
+}
+
+function createChecksum(hrp: string, data: number[]): number[] {
+  const values = [...hrpExpand(hrp), ...data, 0, 0, 0, 0, 0, 0]
+  const mod = polymod(values) ^ 1
+  const ret: number[] = []
+  for (let i = 0; i < 6; i++) ret.push((mod >> (5 * (5 - i))) & 31)
+  return ret
+}
+
+export function bech32Encode(hrp: string, data: Uint8Array): string {
+  const fiveBit = convertBits(Array.from(data), 8, 5, true)
+  if (!fiveBit) throw new Error('Failed to convert bits')
+  const checksum = createChecksum(hrp, fiveBit)
+  return hrp + '1' + [...fiveBit, ...checksum].map(d => CHARSET[d]).join('')
+}
+
+/** Encode a hex public key as npub1... */
+export function encodeNpub(hexPubkey: string): string {
+  return bech32Encode('npub', hexToBytes(hexPubkey))
+}
+
 export interface NIP19Decoded {
   type: 'npub' | 'note' | 'nevent' | 'nprofile' | 'unknown'
   hex: string