fix: complete oidc pending auth callback flows

frontend/src/views/auth/OidcCallbackView.vue

@@ -18,9 +18,10 @@
         <div
           v-if="
             needsInvitation ||
-            needsEmailCollection ||
-            needsExistingAccountBinding ||
-            needsAdoptionConfirmation
+            needsAdoptionConfirmation ||
+            needsCreateAccount ||
+            needsBindLogin ||
+            needsTotpChallenge
           "
           class="space-y-4"
         >
@@ -108,39 +109,6 @@
             </button>
           </template>
 
-          <template v-else-if="needsEmailCollection">
-            <p class="text-sm text-gray-700 dark:text-gray-300">
-              Continue with email to finish setting up your {{ providerName }} sign-in.
-            </p>
-            <div>
-              <input
-                v-model="pendingEmail"
-                type="email"
-                class="input w-full"
-                placeholder="you@example.com"
-                :disabled="isSubmitting"
-                @keyup.enter="handleContinueWithEmail"
-              />
-            </div>
-            <button
-              class="btn btn-primary w-full"
-              :disabled="isSubmitting || !pendingEmail.trim()"
-              @click="handleContinueWithEmail"
-            >
-              Continue with email
-            </button>
-          </template>
-
-          <template v-else-if="needsExistingAccountBinding">
-            <p class="text-sm text-gray-700 dark:text-gray-300">
-              Sign in to bind {{ providerName }} to the existing account for
-              <span class="font-medium text-gray-900 dark:text-white">{{ pendingEmail }}</span>.
-            </p>
-            <button class="btn btn-primary w-full" :disabled="isSubmitting" @click="handleContinueToLogin">
-              Sign in to bind
-            </button>
-          </template>
-
           <template v-else-if="needsAdoptionConfirmation">
             <p class="text-sm text-gray-700 dark:text-gray-300">
               Review the {{ providerName }} profile details before continuing.
@@ -149,6 +117,124 @@
               {{ isSubmitting ? t('common.processing') : 'Continue' }}
             </button>
           </template>
+
+          <template v-else-if="needsCreateAccount">
+            <p class="text-sm text-gray-700 dark:text-gray-300">
+              Enter an email address to create your account and continue.
+            </p>
+            <div class="space-y-3">
+              <input
+                v-model="pendingAccountEmail"
+                data-testid="oidc-create-account-email"
+                type="email"
+                class="input w-full"
+                placeholder="you@example.com"
+                :disabled="isSubmitting"
+                @keyup.enter="handleCreateAccount"
+              />
+              <button
+                data-testid="oidc-create-account-submit"
+                class="btn btn-primary w-full"
+                :disabled="isSubmitting || !pendingAccountEmail.trim()"
+                @click="handleCreateAccount"
+              >
+                {{ isSubmitting ? t('common.processing') : 'Create account' }}
+              </button>
+              <button
+                class="btn btn-secondary w-full"
+                :disabled="isSubmitting"
+                @click="switchToBindLoginMode"
+              >
+                I already have an account
+              </button>
+            </div>
+            <transition name="fade">
+              <p v-if="accountActionError" class="text-sm text-red-600 dark:text-red-400">
+                {{ accountActionError }}
+              </p>
+            </transition>
+          </template>
+
+          <template v-else-if="needsBindLogin">
+            <p class="text-sm text-gray-700 dark:text-gray-300">
+              Log in to an existing account to bind this {{ providerName }} sign-in.
+            </p>
+            <div class="space-y-3">
+              <input
+                v-model="bindLoginEmail"
+                data-testid="oidc-bind-login-email"
+                type="email"
+                class="input w-full"
+                placeholder="you@example.com"
+                :disabled="isSubmitting"
+                @keyup.enter="handleBindLogin"
+              />
+              <input
+                v-model="bindLoginPassword"
+                data-testid="oidc-bind-login-password"
+                type="password"
+                class="input w-full"
+                placeholder="Password"
+                :disabled="isSubmitting"
+                @keyup.enter="handleBindLogin"
+              />
+              <button
+                data-testid="oidc-bind-login-submit"
+                class="btn btn-primary w-full"
+                :disabled="isSubmitting || !bindLoginEmail.trim() || !bindLoginPassword"
+                @click="handleBindLogin"
+              >
+                {{ isSubmitting ? t('common.processing') : 'Log in and bind' }}
+              </button>
+              <button
+                v-if="canReturnToCreateAccount"
+                class="btn btn-secondary w-full"
+                :disabled="isSubmitting"
+                @click="switchToCreateAccountMode"
+              >
+                Use a different email
+              </button>
+            </div>
+            <transition name="fade">
+              <p v-if="accountActionError" class="text-sm text-red-600 dark:text-red-400">
+                {{ accountActionError }}
+              </p>
+            </transition>
+          </template>
+
+          <template v-else-if="needsTotpChallenge">
+            <p class="text-sm text-gray-700 dark:text-gray-300">
+              Enter the 6-digit verification code for
+              <span class="font-medium">{{ totpUserEmailMasked || 'your account' }}</span>
+              to finish binding this {{ providerName }} sign-in.
+            </p>
+            <div class="space-y-3">
+              <input
+                v-model="totpCode"
+                data-testid="oidc-bind-login-totp"
+                type="text"
+                inputmode="numeric"
+                maxlength="6"
+                class="input w-full"
+                placeholder="123456"
+                :disabled="isSubmitting"
+                @keyup.enter="handleSubmitTotpChallenge"
+              />
+              <button
+                data-testid="oidc-bind-login-totp-submit"
+                class="btn btn-primary w-full"
+                :disabled="isSubmitting || totpCode.trim().length !== 6"
+                @click="handleSubmitTotpChallenge"
+              >
+                {{ isSubmitting ? t('common.processing') : 'Verify and continue' }}
+              </button>
+            </div>
+            <transition name="fade">
+              <p v-if="totpError" class="text-sm text-red-600 dark:text-red-400">
+                {{ totpError }}
+              </p>
+            </transition>
+          </template>
         </div>
       </transition>
 
@@ -177,11 +263,12 @@
 </template>
 
 <script setup lang="ts">
-import { onMounted, ref } from 'vue'
+import { computed, onMounted, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { useI18n } from 'vue-i18n'
 import { AuthLayout } from '@/components/layout'
 import Icon from '@/components/icons/Icon.vue'
+import { apiClient } from '@/api/client'
 import { useAuthStore, useAppStore } from '@/stores'
 import {
   completeOIDCOAuthRegistration,
@@ -189,6 +276,7 @@ import {
   getOAuthCompletionKind,
   getPublicSettings,
   isOAuthLoginCompletion,
+  login2FA,
   persistOAuthTokenContext,
   type OAuthAdoptionDecision,
   type PendingOAuthExchangeResponse
@@ -203,7 +291,6 @@ const appStore = useAppStore()
 
 const isProcessing = ref(true)
 const errorMessage = ref('')
-
 const needsInvitation = ref(false)
 const invitationCode = ref('')
 const isSubmitting = ref(false)
@@ -215,11 +302,22 @@ const suggestedDisplayName = ref('')
 const suggestedAvatarUrl = ref('')
 const adoptDisplayName = ref(true)
 const adoptAvatar = ref(true)
-const pendingEmail = ref('')
-const needsEmailCollection = ref(false)
-const needsExistingAccountBinding = ref(false)
 const needsAdoptionConfirmation = ref(false)
+const pendingAccountAction = ref<'none' | 'create_account' | 'bind_login'>('none')
+const pendingAccountEmail = ref('')
+const bindLoginEmail = ref('')
+const bindLoginPassword = ref('')
+const accountActionError = ref('')
+const canReturnToCreateAccount = ref(false)
 const bindSuccessMessage = t('profile.authBindings.bindSuccess')
+const needsTotpChallenge = ref(false)
+const totpTempToken = ref('')
+const totpCode = ref('')
+const totpError = ref('')
+const totpUserEmailMasked = ref('')
+
+const needsCreateAccount = computed(() => pendingAccountAction.value === 'create_account')
+const needsBindLogin = computed(() => pendingAccountAction.value === 'bind_login')
 
 type PendingOidcCompletion = PendingOAuthExchangeResponse & {
   step?: string
@@ -229,6 +327,9 @@ type PendingOidcCompletion = PendingOAuthExchangeResponse & {
   email?: string
   provider_fallback?: string
   intent?: string
+  requires_2fa?: boolean
+  temp_token?: string
+  user_email_masked?: string
 }
 
 function parseFragmentParams(): URLSearchParams {
@@ -258,34 +359,6 @@ async function loadProviderName() {
   }
 }
 
-function normalizedPendingState(value: string | null | undefined): string {
-  return value?.trim().toLowerCase() || ''
-}
-
-function resolvePendingEmail(completion: PendingOidcCompletion): string {
-  return (
-    completion.pending_email ||
-    completion.existing_account_email ||
-    completion.resolved_email ||
-    completion.email ||
-    ''
-  ).trim()
-}
-
-function requiresEmailCollection(completion: PendingOidcCompletion): boolean {
-  const state = normalizedPendingState(completion.step || completion.error)
-  return state === 'email_required'
-}
-
-function requiresExistingAccountBinding(completion: PendingOidcCompletion): boolean {
-  const state = normalizedPendingState(completion.step || completion.error || completion.intent)
-  return (
-    state === 'existing_account_binding_required' ||
-    state === 'existing_account_required' ||
-    state === 'adopt_existing_user_by_email'
-  )
-}
-
 function currentAdoptionDecision(): OAuthAdoptionDecision {
   return {
     adoptDisplayName: adoptDisplayName.value,
@@ -293,6 +366,17 @@ function currentAdoptionDecision(): OAuthAdoptionDecision {
   }
 }
 
+function serializeAdoptionDecision(decision: OAuthAdoptionDecision): Record<string, boolean> {
+  const payload: Record<string, boolean> = {}
+  if (typeof decision.adoptDisplayName === 'boolean') {
+    payload.adopt_display_name = decision.adoptDisplayName
+  }
+  if (typeof decision.adoptAvatar === 'boolean') {
+    payload.adopt_avatar = decision.adoptAvatar
+  }
+  return payload
+}
+
 function applyAdoptionSuggestionState(completion: {
   adoption_required?: boolean
   suggested_display_name?: string
@@ -317,6 +401,100 @@ function hasSuggestedProfile(completion: {
   return Boolean(completion.suggested_display_name || completion.suggested_avatar_url)
 }
 
+function normalizedPendingState(value: string | null | undefined): string {
+  return value?.trim().toLowerCase() || ''
+}
+
+function extractPendingAccountEmail(completion: PendingOidcCompletion): string {
+  return (
+    completion.pending_email ||
+    completion.existing_account_email ||
+    completion.resolved_email ||
+    completion.email ||
+    ''
+  ).trim()
+}
+
+function resolvePendingAccountAction(completion: PendingOidcCompletion): 'none' | 'create_account' | 'bind_login' {
+  const raw = normalizedPendingState(completion.step || completion.error || completion.intent)
+  if (raw === 'email_required' || raw === 'create_account_required' || raw === 'create_account') {
+    return 'create_account'
+  }
+  if (
+    raw === 'bind_login_required' ||
+    raw === 'bind_login' ||
+    raw === 'existing_account_binding_required' ||
+    raw === 'existing_account_required' ||
+    raw === 'adopt_existing_user_by_email'
+  ) {
+    return 'bind_login'
+  }
+  return 'none'
+}
+
+function applyPendingAccountAction(completion: PendingOidcCompletion) {
+  const action = resolvePendingAccountAction(completion)
+  pendingAccountAction.value = action
+  accountActionError.value = ''
+  needsTotpChallenge.value = false
+  totpTempToken.value = ''
+  totpCode.value = ''
+  totpError.value = ''
+  totpUserEmailMasked.value = ''
+
+  const email = extractPendingAccountEmail(completion)
+  if (action === 'create_account') {
+    pendingAccountEmail.value = email
+    canReturnToCreateAccount.value = true
+    return
+  }
+
+  if (action === 'bind_login') {
+    bindLoginEmail.value = email
+    bindLoginPassword.value = ''
+    canReturnToCreateAccount.value = false
+    return
+  }
+
+  canReturnToCreateAccount.value = false
+}
+
+function applyTotpChallenge(completion: PendingOidcCompletion): boolean {
+  if (completion.requires_2fa !== true || !completion.temp_token) {
+    return false
+  }
+
+  pendingAccountAction.value = 'none'
+  needsInvitation.value = false
+  needsAdoptionConfirmation.value = false
+  needsTotpChallenge.value = true
+  totpTempToken.value = completion.temp_token
+  totpCode.value = ''
+  totpError.value = ''
+  totpUserEmailMasked.value = completion.user_email_masked || ''
+  isProcessing.value = false
+  return true
+}
+
+function switchToBindLoginMode() {
+  pendingAccountAction.value = 'bind_login'
+  bindLoginEmail.value = bindLoginEmail.value.trim() || pendingAccountEmail.value.trim()
+  bindLoginPassword.value = ''
+  accountActionError.value = ''
+  canReturnToCreateAccount.value = true
+}
+
+function switchToCreateAccountMode() {
+  pendingAccountAction.value = 'create_account'
+  pendingAccountEmail.value = pendingAccountEmail.value.trim() || bindLoginEmail.value.trim()
+  accountActionError.value = ''
+}
+
+function getRequestErrorMessage(error: unknown, fallback: string): string {
+  const err = error as { message?: string; response?: { data?: { detail?: string; message?: string } } }
+  return err.response?.data?.detail || err.response?.data?.message || err.message || fallback
+}
+
 async function finalizeCompletion(completion: PendingOAuthExchangeResponse, redirect: string) {
   if (getOAuthCompletionKind(completion) === 'bind') {
     const bindRedirect = sanitizeRedirectPath(completion.redirect || '/profile')
@@ -335,6 +513,33 @@ async function finalizeCompletion(completion: PendingOAuthExchangeResponse, redi
   await router.replace(redirect)
 }
 
+async function finalizePendingAccountResponse(completion: PendingOidcCompletion) {
+  applyAdoptionSuggestionState(completion)
+
+  if (completion.error === 'invitation_required') {
+    pendingAccountAction.value = 'none'
+    needsInvitation.value = true
+    needsAdoptionConfirmation.value = false
+    isProcessing.value = false
+    return
+  }
+
+  if (applyTotpChallenge(completion)) {
+    return
+  }
+
+  applyPendingAccountAction(completion)
+  if (pendingAccountAction.value !== 'none') {
+    needsInvitation.value = false
+    needsAdoptionConfirmation.value = false
+    isProcessing.value = false
+    return
+  }
+
+  const redirect = sanitizeRedirectPath(completion.redirect || redirectTo.value)
+  await finalizeCompletion(completion, redirect)
+}
+
 async function handleSubmitInvitation() {
   invitationError.value = ''
   if (!invitationCode.value.trim()) return
@@ -364,12 +569,7 @@ async function handleContinueLogin() {
     const completion = await exchangePendingOAuthCompletion(currentAdoptionDecision())
     await finalizeCompletion(completion, redirectTo.value)
   } catch (e: unknown) {
-    const err = e as { message?: string; response?: { data?: { detail?: string; message?: string } } }
-    errorMessage.value =
-      err.response?.data?.detail ||
-      err.response?.data?.message ||
-      err.message ||
-      t('auth.loginFailed')
+    errorMessage.value = getRequestErrorMessage(e, t('auth.loginFailed'))
     appStore.showError(errorMessage.value)
     needsAdoptionConfirmation.value = false
   } finally {
@@ -377,33 +577,65 @@ async function handleContinueLogin() {
   }
 }
 
-async function handleContinueWithEmail() {
-  const email = pendingEmail.value.trim()
-  if (!email) {
-    return
-  }
+async function handleCreateAccount() {
+  accountActionError.value = ''
+  const email = pendingAccountEmail.value.trim()
+  if (!email) return
 
-  await router.replace({
-    path: '/register',
-    query: {
+  isSubmitting.value = true
+  try {
+    const { data } = await apiClient.post<PendingOidcCompletion>('/auth/oauth/pending/create-account', {
       email,
-      redirect: redirectTo.value,
-      provider: providerName.value
-    }
-  })
+      ...serializeAdoptionDecision(currentAdoptionDecision())
+    })
+    await finalizePendingAccountResponse(data)
+  } catch (e: unknown) {
+    accountActionError.value = getRequestErrorMessage(e, t('auth.loginFailed'))
+  } finally {
+    isSubmitting.value = false
+  }
 }
 
-async function handleContinueToLogin() {
-  const email = pendingEmail.value.trim()
+async function handleBindLogin() {
+  accountActionError.value = ''
+  const email = bindLoginEmail.value.trim()
+  const password = bindLoginPassword.value
+  if (!email || !password) return
 
-  await router.replace({
-    path: '/login',
-    query: {
+  isSubmitting.value = true
+  try {
+    const { data } = await apiClient.post<PendingOidcCompletion>('/auth/oauth/pending/bind-login', {
       email,
-      redirect: redirectTo.value,
-      provider: providerName.value
-    }
-  })
+      password,
+      ...serializeAdoptionDecision(currentAdoptionDecision())
+    })
+    await finalizePendingAccountResponse(data)
+  } catch (e: unknown) {
+    accountActionError.value = getRequestErrorMessage(e, t('auth.loginFailed'))
+  } finally {
+    isSubmitting.value = false
+  }
+}
+
+async function handleSubmitTotpChallenge() {
+  totpError.value = ''
+  const code = totpCode.value.trim()
+  if (!totpTempToken.value || code.length !== 6) return
+
+  isSubmitting.value = true
+  try {
+    const completion = await login2FA({
+      temp_token: totpTempToken.value,
+      totp_code: code
+    })
+    await authStore.setToken(completion.access_token)
+    appStore.showSuccess(t('auth.loginSuccess'))
+    await router.replace(redirectTo.value)
+  } catch (e: unknown) {
+    totpError.value = getRequestErrorMessage(e, t('auth.loginFailed'))
+  } finally {
+    isSubmitting.value = false
+  }
 }
 
 onMounted(async () => {
@@ -427,7 +659,6 @@ onMounted(async () => {
     )
     applyAdoptionSuggestionState(completion)
     redirectTo.value = redirect
-    pendingEmail.value = resolvePendingEmail(completion)
 
     if (completion.error === 'invitation_required') {
       needsInvitation.value = true
@@ -435,14 +666,12 @@ onMounted(async () => {
       return
     }
 
-    if (requiresEmailCollection(completion)) {
-      needsEmailCollection.value = true
-      isProcessing.value = false
+    if (applyTotpChallenge(completion)) {
       return
     }
 
-    if (requiresExistingAccountBinding(completion)) {
-      needsExistingAccountBinding.value = true
+    applyPendingAccountAction(completion)
+    if (pendingAccountAction.value !== 'none') {
       isProcessing.value = false
       return
     }
@@ -455,12 +684,7 @@ onMounted(async () => {
 
     await finalizeCompletion(completion, redirect)
   } catch (e: unknown) {
-    const err = e as { message?: string; response?: { data?: { detail?: string; message?: string } } }
-    errorMessage.value =
-      err.response?.data?.detail ||
-      err.response?.data?.message ||
-      err.message ||
-      t('auth.loginFailed')
+    errorMessage.value = getRequestErrorMessage(e, t('auth.loginFailed'))
     appStore.showError(errorMessage.value)
     isProcessing.value = false
   }

frontend/src/views/auth/__tests__/OidcCallbackView.spec.ts

@@ -10,6 +10,8 @@ const setToken = vi.fn()
 const exchangePendingOAuthCompletion = vi.fn()
 const completeOIDCOAuthRegistration = vi.fn()
 const getPublicSettings = vi.fn()
+const login2FA = vi.fn()
+const apiClientPost = vi.fn()
 
 vi.mock('vue-router', () => ({
   useRoute: () => ({
@@ -45,13 +47,20 @@ vi.mock('@/stores', () => ({
   })
 }))
 
+vi.mock('@/api/client', () => ({
+  apiClient: {
+    post: (...args: any[]) => apiClientPost(...args)
+  }
+}))
+
 vi.mock('@/api/auth', async () => {
   const actual = await vi.importActual<typeof import('@/api/auth')>('@/api/auth')
   return {
     ...actual,
     exchangePendingOAuthCompletion: (...args: any[]) => exchangePendingOAuthCompletion(...args),
     completeOIDCOAuthRegistration: (...args: any[]) => completeOIDCOAuthRegistration(...args),
-    getPublicSettings: (...args: any[]) => getPublicSettings(...args)
+    getPublicSettings: (...args: any[]) => getPublicSettings(...args),
+    login2FA: (...args: any[]) => login2FA(...args)
   }
 })
 
@@ -64,6 +73,8 @@ describe('OidcCallbackView', () => {
     exchangePendingOAuthCompletion.mockReset()
     completeOIDCOAuthRegistration.mockReset()
     getPublicSettings.mockReset()
+    login2FA.mockReset()
+    apiClientPost.mockReset()
     getPublicSettings.mockResolvedValue({
       oidc_oauth_provider_name: 'ExampleID'
     })
@@ -132,9 +143,7 @@ describe('OidcCallbackView', () => {
     const checkboxes = wrapper.findAll('input[type="checkbox"]')
     await checkboxes[0].setValue(false)
 
-    const buttons = wrapper.findAll('button')
-    expect(buttons).toHaveLength(1)
-    await buttons[0].trigger('click')
+    await wrapper.findAll('button')[0].trigger('click')
     await flushPromises()
 
     expect(exchangePendingOAuthCompletion).toHaveBeenCalledTimes(2)
@@ -184,77 +193,6 @@ describe('OidcCallbackView', () => {
     expect(replace).toHaveBeenCalledWith('/profile')
   })
 
-  it('renders pending email collection ui and routes to register with the entered email', async () => {
-    exchangePendingOAuthCompletion.mockResolvedValue({
-      error: 'email_required',
-      redirect: '/profile',
-      provider_fallback: 'ExampleID'
-    })
-
-    const wrapper = mount(OidcCallbackView, {
-      global: {
-        stubs: {
-          AuthLayout: { template: '<div><slot /></div>' },
-          Icon: true,
-          RouterLink: { template: '<a><slot /></a>' },
-          transition: false
-        }
-      }
-    })
-
-    await flushPromises()
-
-    expect(setToken).not.toHaveBeenCalled()
-    expect(wrapper.text()).toContain('Continue with email')
-
-    await wrapper.get('input[type="email"]').setValue('alice@example.com')
-    await wrapper.get('button').trigger('click')
-
-    expect(replace).toHaveBeenCalledWith({
-      path: '/register',
-      query: {
-        email: 'alice@example.com',
-        redirect: '/profile',
-        provider: 'ExampleID'
-      }
-    })
-  })
-
-  it('renders existing-account binding ui and routes to login', async () => {
-    exchangePendingOAuthCompletion.mockResolvedValue({
-      error: 'existing_account_binding_required',
-      redirect: '/profile',
-      existing_account_email: 'alice@example.com'
-    })
-
-    const wrapper = mount(OidcCallbackView, {
-      global: {
-        stubs: {
-          AuthLayout: { template: '<div><slot /></div>' },
-          Icon: true,
-          RouterLink: { template: '<a><slot /></a>' },
-          transition: false
-        }
-      }
-    })
-
-    await flushPromises()
-
-    expect(wrapper.text()).toContain('alice@example.com')
-    expect(wrapper.text()).toContain('Sign in to bind')
-
-    await wrapper.get('button').trigger('click')
-
-    expect(replace).toHaveBeenCalledWith({
-      path: '/login',
-      query: {
-        email: 'alice@example.com',
-        redirect: '/profile',
-        provider: 'ExampleID'
-      }
-    })
-  })
-
   it('renders adoption choices for invitation flow and submits the selected values', async () => {
     exchangePendingOAuthCompletion.mockResolvedValue({
       error: 'invitation_required',
@@ -284,13 +222,8 @@ describe('OidcCallbackView', () => {
 
     await flushPromises()
 
-    expect(wrapper.text()).toContain('OIDC Nick')
-    expect(exchangePendingOAuthCompletion).toHaveBeenCalledTimes(1)
-    expect(exchangePendingOAuthCompletion).toHaveBeenCalledWith()
-
     const checkboxes = wrapper.findAll('input[type="checkbox"]')
     expect(checkboxes).toHaveLength(2)
-
     await checkboxes[1].setValue(false)
     await wrapper.find('input[type="text"]').setValue('invite-code')
     await wrapper.find('button').trigger('click')
@@ -300,4 +233,154 @@ describe('OidcCallbackView', () => {
       adoptAvatar: false
     })
   })
+
+  it('collects email for pending oauth account creation and submits adoption decisions', async () => {
+    exchangePendingOAuthCompletion.mockResolvedValue({
+      error: 'email_required',
+      redirect: '/welcome',
+      adoption_required: true,
+      suggested_display_name: 'OIDC Nick',
+      suggested_avatar_url: 'https://cdn.example/oidc.png'
+    })
+    apiClientPost.mockResolvedValue({
+      data: {
+        access_token: 'new-access-token',
+        refresh_token: 'new-refresh-token',
+        expires_in: 3600,
+        token_type: 'Bearer'
+      }
+    })
+    setToken.mockResolvedValue({})
+
+    const wrapper = mount(OidcCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false
+        }
+      }
+    })
+
+    await flushPromises()
+
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+    expect(checkboxes).toHaveLength(2)
+    await checkboxes[1].setValue(false)
+    await wrapper.get('[data-testid="oidc-create-account-email"]').setValue('  new@example.com  ')
+    await wrapper.get('[data-testid="oidc-create-account-submit"]').trigger('click')
+    await flushPromises()
+
+    expect(apiClientPost).toHaveBeenCalledWith('/auth/oauth/pending/create-account', {
+      email: 'new@example.com',
+      adopt_display_name: true,
+      adopt_avatar: false
+    })
+    expect(setToken).toHaveBeenCalledWith('new-access-token')
+    expect(replace).toHaveBeenCalledWith('/welcome')
+  })
+
+  it('shows bind-login form for existing account binding and submits credentials with adoption decisions', async () => {
+    exchangePendingOAuthCompletion.mockResolvedValue({
+      error: 'adopt_existing_user_by_email',
+      redirect: '/profile/security',
+      email: 'existing@example.com',
+      adoption_required: true,
+      suggested_display_name: 'OIDC Nick',
+      suggested_avatar_url: 'https://cdn.example/oidc.png'
+    })
+    apiClientPost.mockResolvedValue({
+      data: {
+        access_token: 'bind-access-token',
+        refresh_token: 'bind-refresh-token',
+        expires_in: 3600,
+        token_type: 'Bearer'
+      }
+    })
+    setToken.mockResolvedValue({})
+
+    const wrapper = mount(OidcCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false
+        }
+      }
+    })
+
+    await flushPromises()
+
+    const checkboxes = wrapper.findAll('input[type="checkbox"]')
+    expect(checkboxes).toHaveLength(2)
+    await checkboxes[0].setValue(false)
+    await wrapper.get('[data-testid="oidc-bind-login-email"]').setValue('existing@example.com')
+    await wrapper.get('[data-testid="oidc-bind-login-password"]').setValue('secret-password')
+    await wrapper.get('[data-testid="oidc-bind-login-submit"]').trigger('click')
+    await flushPromises()
+
+    expect(apiClientPost).toHaveBeenCalledWith('/auth/oauth/pending/bind-login', {
+      email: 'existing@example.com',
+      password: 'secret-password',
+      adopt_display_name: false,
+      adopt_avatar: true
+    })
+    expect(setToken).toHaveBeenCalledWith('bind-access-token')
+    expect(replace).toHaveBeenCalledWith('/profile/security')
+  })
+
+  it('handles bind-login 2FA challenge before redirecting', async () => {
+    exchangePendingOAuthCompletion.mockResolvedValue({
+      error: 'adopt_existing_user_by_email',
+      redirect: '/profile',
+      email: 'existing@example.com',
+      adoption_required: true,
+      suggested_display_name: 'OIDC Nick',
+      suggested_avatar_url: 'https://cdn.example/oidc.png'
+    })
+    apiClientPost.mockResolvedValue({
+      data: {
+        requires_2fa: true,
+        temp_token: 'temp-123',
+        user_email_masked: 'o***g@example.com'
+      }
+    })
+    login2FA.mockResolvedValue({
+      access_token: '2fa-access-token'
+    })
+    setToken.mockResolvedValue({})
+
+    const wrapper = mount(OidcCallbackView, {
+      global: {
+        stubs: {
+          AuthLayout: { template: '<div><slot /></div>' },
+          Icon: true,
+          RouterLink: { template: '<a><slot /></a>' },
+          transition: false
+        }
+      }
+    })
+
+    await flushPromises()
+
+    await wrapper.get('[data-testid="oidc-bind-login-password"]').setValue('secret-password')
+    await wrapper.get('[data-testid="oidc-bind-login-submit"]').trigger('click')
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('o***g@example.com')
+    expect(login2FA).not.toHaveBeenCalled()
+
+    await wrapper.get('[data-testid="oidc-bind-login-totp"]').setValue('123456')
+    await wrapper.get('[data-testid="oidc-bind-login-totp-submit"]').trigger('click')
+    await flushPromises()
+
+    expect(login2FA).toHaveBeenCalledWith({
+      temp_token: 'temp-123',
+      totp_code: '123456'
+    })
+    expect(setToken).toHaveBeenCalledWith('2fa-access-token')
+    expect(replace).toHaveBeenCalledWith('/profile')
+  })
 })