Admin user edit: UI, API and server guard

Add full admin user editing flow: introduce EditUserDialog component and integrate it into AdminUserDetail (with minor copy and button variant tweaks), plus layout tweaks to animate the account chevron. Implement updateAdminUser(...) in GUI services to PATCH /auth/user/{id} with comprehensive error handling and export FORBIDDEN_NOT_ADMIN_MESSAGE. Server-side AppUserController now prevents deactivating users in the Admin role and returns a 403, ensuring admin accounts cannot be disabled. These changes enable editing usernames and activation status from the admin UI while protecting admin accounts.

API/Controllers/Auth/AppUserController.cs

@@ -2,6 +2,7 @@ using API.Contracts.Auth;
 using API.Models;
 using API.Security;
 using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.EntityFrameworkCore;
@@ -48,6 +49,12 @@ namespace API.Controllers.Auth
 
             if (changeDto.IsActive != null)
             {
+                if (!changeDto.IsActive.Value && await userManager.IsInRoleAsync(user, RoleNames.Admin))
+                {
+                    return StatusCode(StatusCodes.Status403Forbidden,
+                        new { message = "Adminkonten können nicht deaktiviert werden." });
+                }
+
                 user.IsActive = changeDto.IsActive.Value;
 
                 if (!changeDto.IsActive.Value)

GUI/src/Layout.vue

@@ -20,6 +20,8 @@ const theme = useTheme()
 const route = useRoute()
 const router = useRouter()
 const showDrawer = ref(true)
+const isAccountMenuOpen = ref(false)
+const accountChevRotation = ref(0)
 const currentYear = new Date().getFullYear()
 const themeStorageKey = 'theme'
 const currentUser = ref<CurrentUser | null>(null)
@@ -162,6 +164,14 @@ onMounted(() => {
   void refreshAuthState({ force: true })
 })
 
+watch(isAccountMenuOpen, (open) => {
+  if (open) {
+    accountChevRotation.value = Math.random() < 0.5 ? 180 : -180
+  } else {
+    accountChevRotation.value = 0
+  }
+})
+
 watch(
   () => route.fullPath,
   () => {
@@ -224,8 +234,7 @@ watch(
         <template v-if="isAuthenticated">
           <v-menu
             v-if="!display.smAndDown.value"
-            open-on-hover
+            v-model="isAccountMenuOpen"
-            :open-on-click="false"
             location="bottom end"
             offset="10"
           >
@@ -234,14 +243,18 @@ watch(
                 type="button"
                 class="account-pill"
                 v-bind="props"
-                @click="router.push({ name: 'Dashboard' })"
               >
                 <span class="account-pill__avatar">{{ userInitials }}</span>
                 <span class="account-pill__label">
                   <span class="account-pill__hint">Angemeldet</span>
                   <span class="account-pill__name">{{ userLabel }}</span>
                 </span>
-                <v-icon class="account-pill__chev">mdi-chevron-down</v-icon>
+                <v-icon
+                  class="account-pill__chev"
+                  :style="{ transform: `rotate(${accountChevRotation}deg)` }"
+                >
+                  mdi-chevron-down
+                </v-icon>
               </button>
             </template>
 
@@ -636,6 +649,13 @@ watch(
   color: var(--color-text-muted);
   width: 18px;
   height: 18px;
+  transition: transform var(--transition-medium);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  .account-pill__chev {
+    transition: none;
+  }
 }
 
 @media (width <= 1280px) {

GUI/src/components/admin/EditUserDialog.vue

@@ -0,0 +1,264 @@
+<script setup lang="ts">
+import { computed, ref, watch } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+import {
+  FORBIDDEN_NOT_ADMIN_MESSAGE,
+  updateAdminUser,
+  type AdminUser,
+  type UpdateAdminUserPayload,
+} from '@/services/adminUsers'
+import { AuthRequestError } from '@/services/authSession'
+import { useAppBannersStore } from '@/stores/appBanners'
+
+interface Props {
+  modelValue: boolean
+  user: AdminUser
+}
+
+const props = defineProps<Props>()
+
+const emit = defineEmits<{
+  (event: 'update:modelValue', value: boolean): void
+  (event: 'updated', user: AdminUser): void
+}>()
+
+const route = useRoute()
+const router = useRouter()
+const appBannersStore = useAppBannersStore()
+
+const formUserName = ref(props.user.userName)
+const formIsActive = ref(props.user.isActive)
+const isSubmitting = ref(false)
+const errorMessage = ref('')
+const userNameError = ref('')
+
+watch(
+  () => props.modelValue,
+  (open, prevOpen) => {
+    if (open && !prevOpen) {
+      formUserName.value = props.user.userName
+      formIsActive.value = props.user.isActive
+      errorMessage.value = ''
+      userNameError.value = ''
+      isSubmitting.value = false
+    }
+  },
+)
+
+const isAdmin = computed(() => props.user.roles.some((role) => role.toLowerCase() === 'admin'))
+
+const trimmedUserName = computed(() => formUserName.value.trim())
+
+const hasChanges = computed(() => {
+  return (
+    trimmedUserName.value !== props.user.userName ||
+    formIsActive.value !== props.user.isActive
+  )
+})
+
+const showDeactivationHint = computed(() => {
+  return props.user.isActive && !formIsActive.value
+})
+
+function close() {
+  if (isSubmitting.value) {
+    return
+  }
+  emit('update:modelValue', false)
+}
+
+function clearUserNameErrorOnEdit() {
+  if (userNameError.value) {
+    userNameError.value = ''
+  }
+}
+
+async function submit() {
+  if (isSubmitting.value || !hasChanges.value) {
+    return
+  }
+
+  errorMessage.value = ''
+  userNameError.value = ''
+
+  const payload: UpdateAdminUserPayload = {}
+
+  if (trimmedUserName.value !== props.user.userName) {
+    if (trimmedUserName.value.length === 0) {
+      userNameError.value = 'Benutzername darf nicht leer sein.'
+      return
+    }
+    payload.userName = trimmedUserName.value
+  }
+
+  if (formIsActive.value !== props.user.isActive) {
+    payload.isActive = formIsActive.value
+  }
+
+  isSubmitting.value = true
+
+  try {
+    const updated = await updateAdminUser(props.user.id, payload)
+    emit('updated', updated)
+    appBannersStore.push({
+      type: 'success',
+      message: 'Benutzer wurde aktualisiert.',
+    })
+    emit('update:modelValue', false)
+  } catch (error) {
+    if (error instanceof AuthRequestError) {
+      if (error.status === 401) {
+        emit('update:modelValue', false)
+        await router.replace({
+          name: 'Login',
+          query: { redirect: route.fullPath },
+        })
+        return
+      }
+
+      if (error.status === 403 && error.message === FORBIDDEN_NOT_ADMIN_MESSAGE) {
+        emit('update:modelValue', false)
+        await router.replace({ name: 'Forbidden' })
+        return
+      }
+
+      errorMessage.value = error.message
+
+      if (error.status === 400 && /leer/i.test(error.message)) {
+        userNameError.value = error.message
+      }
+    } else {
+      errorMessage.value = 'Benutzer konnte nicht aktualisiert werden.'
+    }
+  } finally {
+    isSubmitting.value = false
+  }
+}
+</script>
+
+<template>
+  <v-dialog
+    :model-value="modelValue"
+    max-width="520"
+    persistent
+    @update:model-value="(value: boolean) => emit('update:modelValue', value)"
+  >
+    <v-card class="edit-user-dialog ui-panel">
+      <v-card-title class="edit-user-dialog__title">
+        <p class="ui-kicker ui-kicker--xs">Adminbereich</p>
+        <h2>Benutzer bearbeiten</h2>
+      </v-card-title>
+
+      <v-card-text class="edit-user-dialog__body">
+        <v-form @submit.prevent="submit">
+          <v-text-field
+            v-model="formUserName"
+            label="Benutzername"
+            prepend-inner-icon="mdi-account-outline"
+            autocomplete="off"
+            :error="!!userNameError"
+            :error-messages="userNameError"
+            :disabled="isSubmitting"
+            @update:model-value="clearUserNameErrorOnEdit"
+          />
+
+          <v-switch
+            v-model="formIsActive"
+            color="primary"
+            hide-details
+            :label="formIsActive ? 'Konto ist aktiv' : 'Konto ist inaktiv'"
+            :disabled="isSubmitting || isAdmin"
+          />
+
+          <p v-if="isAdmin" class="edit-user-dialog__hint">
+            <v-icon size="16" icon="mdi-shield-lock-outline" />
+            Adminkonten können nicht deaktiviert werden.
+          </p>
+
+          <p v-else-if="showDeactivationHint" class="edit-user-dialog__hint">
+            <v-icon size="16" icon="mdi-information-outline" />
+            Beim Deaktivieren werden bestehende Sessions des Nutzers beendet.
+          </p>
+
+          <v-alert
+            v-if="errorMessage"
+            type="error"
+            density="comfortable"
+            class="edit-user-dialog__alert"
+          >
+            {{ errorMessage }}
+          </v-alert>
+        </v-form>
+      </v-card-text>
+
+      <v-card-actions class="edit-user-dialog__actions">
+        <v-btn variant="text" :disabled="isSubmitting" @click="close">
+          Abbrechen
+        </v-btn>
+        <v-btn
+          variant="elevated"
+          color="primary"
+          prepend-icon="mdi-content-save-outline"
+          :loading="isSubmitting"
+          :disabled="!hasChanges || isSubmitting"
+          @click="submit"
+        >
+          Speichern
+        </v-btn>
+      </v-card-actions>
+    </v-card>
+  </v-dialog>
+</template>
+
+<style scoped>
+.edit-user-dialog {
+  padding: var(--space-2);
+}
+
+.edit-user-dialog__title {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-start;
+  gap: var(--space-2);
+  padding: var(--space-5) var(--space-6) 0;
+}
+
+.edit-user-dialog__title h2 {
+  margin: 0;
+  font-size: var(--font-size-xl);
+  letter-spacing: -0.01em;
+}
+
+.edit-user-dialog__body {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-4);
+  padding: var(--space-5) var(--space-6);
+}
+
+.edit-user-dialog__body :deep(.v-form) {
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-4);
+}
+
+.edit-user-dialog__hint {
+  display: flex;
+  align-items: center;
+  gap: var(--space-2);
+  margin: 0;
+  color: var(--color-text-secondary);
+  font-size: var(--font-size-sm);
+}
+
+.edit-user-dialog__alert {
+  margin-top: var(--space-1);
+}
+
+.edit-user-dialog__actions {
+  display: flex;
+  justify-content: flex-end;
+  gap: var(--space-2);
+  padding: 0 var(--space-6) var(--space-5);
+}
+</style>

GUI/src/routes/admin/AdminUserDetail.vue

@@ -6,6 +6,7 @@ import { AuthRequestError } from '@/services/authSession'
 import { useAppBannersStore } from '@/stores/appBanners'
 import StatusPill from '@/components/ui/StatusPill.vue'
 import UserAvatar from '@/components/ui/UserAvatar.vue'
+import EditUserDialog from '@/components/admin/EditUserDialog.vue'
 
 const route = useRoute()
 const router = useRouter()
@@ -14,6 +15,7 @@ const appBannersStore = useAppBannersStore()
 const isLoading = ref(true)
 const errorMessage = ref('')
 const user = ref<AdminUser | null>(null)
+const isEditDialogOpen = ref(false)
 
 const routeUserId = computed(() => {
   const value = route.params.userId
@@ -91,6 +93,10 @@ async function navigateToList() {
   await router.push({ name: 'AdminUsers' })
 }
 
+function handleUserUpdated(updated: AdminUser) {
+  user.value = updated
+}
+
 onMounted(() => {
   void loadUser()
 })
@@ -102,7 +108,7 @@ onMounted(() => {
       <div class="admin-user-detail-head__copy">
         <p class="ui-kicker ui-kicker--wide">Adminbereich</p>
         <h1>Benutzerdetails</h1>
-        <p>Read-only Ansicht des ausgewählten Kontos. Änderungen erfolgen aktuell außerhalb der App.</p>
+        <p>Detailansicht des ausgewählten Kontos. Über <strong>Bearbeiten</strong> lassen sich Benutzername und Status anpassen.</p>
       </div>
 
       <div class="admin-user-detail-head__actions ui-action-row">
@@ -114,7 +120,7 @@ onMounted(() => {
           Zurück zur Liste
         </v-btn>
         <v-btn
-          variant="elevated"
+          variant="outlined"
           prepend-icon="mdi-refresh"
           :loading="isLoading"
           :disabled="isLoading"
@@ -122,6 +128,15 @@ onMounted(() => {
         >
           Neu laden
         </v-btn>
+        <v-btn
+          variant="elevated"
+          color="primary"
+          prepend-icon="mdi-pencil"
+          :disabled="isLoading || !user"
+          @click="isEditDialogOpen = true"
+        >
+          Bearbeiten
+        </v-btn>
       </div>
     </header>
 
@@ -174,6 +189,13 @@ onMounted(() => {
         </div>
       </dl>
     </article>
+
+    <EditUserDialog
+      v-if="user"
+      v-model="isEditDialogOpen"
+      :user="user"
+      @updated="handleUserUpdated"
+    />
   </v-container>
 </template>
 

GUI/src/services/adminUsers.ts

@@ -160,3 +160,79 @@ export async function fetchAdminUserById(userId: string): Promise<AdminUser> {
 
   return user
 }
+
+export interface UpdateAdminUserPayload {
+  userName?: string
+  isActive?: boolean
+}
+
+export async function updateAdminUser(
+  userId: string,
+  payload: UpdateAdminUserPayload,
+): Promise<AdminUser> {
+  const normalizedId = userId.trim()
+  if (normalizedId.length === 0) {
+    throw new AuthRequestError('Ungültige Benutzer-ID.', 400)
+  }
+
+  let response: Response
+
+  try {
+    response = await fetch(`/auth/user/${encodeURIComponent(normalizedId)}`, {
+      method: 'PATCH',
+      credentials: 'include',
+      headers: {
+        'Content-Type': 'application/json',
+        Accept: 'application/json',
+      },
+      body: JSON.stringify(payload),
+    })
+  } catch (error) {
+    throw toAdminUserError(error, 'Server ist nicht erreichbar. Bitte später erneut versuchen.')
+  }
+
+  if (response.status === 401) {
+    throw new AuthRequestError('Session abgelaufen. Bitte melde dich erneut an.', response.status)
+  }
+
+  if (response.status === 403) {
+    const apiMessage = await readApiMessage(response)
+    throw new AuthRequestError(
+      apiMessage ?? 'Du bist angemeldet, aber nicht als Admin autorisiert.',
+      response.status,
+    )
+  }
+
+  if (response.status === 404) {
+    const apiMessage = await readApiMessage(response)
+    throw new AuthRequestError(apiMessage ?? 'Benutzer wurde nicht gefunden.', response.status)
+  }
+
+  if (response.status === 409) {
+    const apiMessage = await readApiMessage(response)
+    throw new AuthRequestError(apiMessage ?? 'Benutzername ist bereits vergeben.', response.status)
+  }
+
+  if (response.status === 400) {
+    const apiMessage = await readApiMessage(response)
+    throw new AuthRequestError(apiMessage ?? 'Eingaben sind ungültig.', response.status)
+  }
+
+  if (!response.ok) {
+    const apiMessage = await readApiMessage(response)
+    throw new AuthRequestError(
+      apiMessage ?? 'Benutzer konnte nicht aktualisiert werden.',
+      response.status,
+    )
+  }
+
+  const body: unknown = await response.json()
+  const user = normalizeAdminUser(body)
+  if (!user) {
+    throw new AuthRequestError('Antwortformat von /auth/user/{id} ist ungültig.', response.status)
+  }
+
+  return user
+}
+
+export const FORBIDDEN_NOT_ADMIN_MESSAGE = 'Du bist angemeldet, aber nicht als Admin autorisiert.'