feat: add Telegram authentication

frontend_nuxt/pages/telegram-callback.vue

@@ -0,0 +1,41 @@
+<template>
+  <CallbackPage />
+</template>
+
+<script setup>
+import CallbackPage from '~/components/CallbackPage.vue'
+import { telegramExchange } from '~/utils/telegram'
+
+onMounted(async () => {
+  const url = new URL(window.location.href)
+  const inviteToken =
+    url.searchParams.get('invite_token') || url.searchParams.get('invitetoken') || ''
+  const hash = url.hash.startsWith('#tgAuthResult=') ? url.hash.slice('#tgAuthResult='.length) : ''
+  if (!hash) {
+    navigateTo('/login', { replace: true })
+    return
+  }
+  let authData
+  try {
+    const parsed = JSON.parse(decodeURIComponent(hash))
+    authData = {
+      id: String(parsed.id),
+      firstName: parsed.first_name,
+      lastName: parsed.last_name,
+      username: parsed.username,
+      photoUrl: parsed.photo_url,
+      authDate: parsed.auth_date,
+      hash: parsed.hash,
+    }
+  } catch (e) {
+    navigateTo('/login', { replace: true })
+    return
+  }
+  const result = await telegramExchange(authData, inviteToken, '')
+  if (result.needReason) {
+    navigateTo(`/signup-reason?token=${result.token}`, { replace: true })
+  } else {
+    navigateTo('/', { replace: true })
+  }
+})
+</script>