Enables user selection for permissions

Replaces the user ID input field with a user selection dropdown,
allowing administrators to search and select users for permission
management. This simplifies the process of assigning permissions
and improves user experience.

Fetches Castle users via a new API endpoint and filters them
based on search input. Only users with Castle accounts
(receivables, payables, equity, or permissions) are listed.

static/js/permissions.js

@@ -5,6 +5,8 @@ window.app = Vue.createApp({
     return {
       permissions: [],
       accounts: [],
+      users: [],
+      filteredUsers: [],
       loading: false,
       granting: false,
       revoking: false,
@@ -48,6 +50,15 @@ window.app = Vue.createApp({
       }))
     },
 
+    userOptions() {
+      const users = this.filteredUsers.length > 0 ? this.filteredUsers : this.users
+      return users.map(user => ({
+        id: user.id,
+        username: user.username || user.id,
+        label: user.username ? `${user.username} (${user.id.substring(0, 8)}...)` : user.id
+      }))
+    },
+
     isGrantFormValid() {
       return !!(
         this.grantForm.user_id &&
@@ -130,6 +141,48 @@ window.app = Vue.createApp({
       }
     },
 
+    async loadUsers() {
+      if (!this.isSuperUser) {
+        return
+      }
+
+      try {
+        const response = await LNbits.api.request(
+          'GET',
+          '/castle/api/v1/admin/castle-users',
+          this.g.user.wallets[0].adminkey
+        )
+        this.users = response.data || []
+        this.filteredUsers = []
+      } catch (error) {
+        console.error('Failed to load users:', error)
+        this.$q.notify({
+          type: 'negative',
+          message: 'Failed to load users',
+          caption: error.message || 'Unknown error',
+          timeout: 5000
+        })
+      }
+    },
+
+    filterUsers(val, update) {
+      if (val === '') {
+        update(() => {
+          this.filteredUsers = []
+        })
+        return
+      }
+
+      update(() => {
+        const needle = val.toLowerCase()
+        this.filteredUsers = this.users.filter(user => {
+          const username = user.username || ''
+          const userId = user.id || ''
+          return username.toLowerCase().includes(needle) || userId.toLowerCase().includes(needle)
+        })
+      })
+    },
+
     async grantPermission() {
       if (!this.isGrantFormValid) {
         this.$q.notify({
@@ -283,7 +336,10 @@ window.app = Vue.createApp({
     if (this.g.user.wallets && this.g.user.wallets.length > 0) {
       await this.loadAccounts()
       if (this.isSuperUser) {
-        await this.loadPermissions()
+        await Promise.all([
+          this.loadPermissions(),
+          this.loadUsers()
+        ])
       }
     }
   }

templates/castle/permissions.html

@@ -187,19 +187,33 @@
     </q-card-section>
 
     <q-card-section class="q-gutter-md">
-      <!-- User ID -->
+      <!-- User -->
-      <q-input
+      <q-select
         v-model="grantForm.user_id"
-        label="User ID *"
+        label="User *"
-        hint="Wallet ID of the user"
+        hint="Search and select a user"
+        :options="userOptions"
+        option-value="id"
+        option-label="label"
+        emit-value
+        map-options
+        use-input
+        @filter="filterUsers"
         outlined
         dense
-        :rules="[val => !!val || 'User ID is required']"
+        :rules="[val => !!val || 'User is required']"
       >
         <template v-slot:prepend>
           <q-icon name="person"></q-icon>
         </template>
-      </q-input>
+        <template v-slot:no-option>
+          <q-item>
+            <q-item-section class="text-grey">
+              No users found
+            </q-item-section>
+          </q-item>
+        </template>
+      </q-select>
 
       <!-- Account -->
       <q-select

views_api.py

@@ -1339,6 +1339,71 @@ async def api_get_all_users(
     return users
 
 
+@castle_api_router.get("/api/v1/admin/castle-users")
+async def api_get_castle_users(
+    wallet: WalletTypeInfo = Depends(require_admin_key),
+) -> list[dict]:
+    """
+    Get all users who have Castle accounts (receivables, payables, equity, or permissions).
+    This returns only users who are actively using Castle, not all LNbits users.
+    Admin only.
+    """
+    from lnbits.core.crud.users import get_user
+    from .crud import get_all_equity_eligible_users
+
+    # Get all user-specific accounts (Receivable/Payable/Equity)
+    all_accounts = await get_all_accounts()
+    user_accounts = [acc for acc in all_accounts if acc.user_id is not None]
+
+    # Get all users who have permissions
+    all_permissions = []
+    for account in all_accounts:
+        account_perms = await get_account_permissions(account.id)
+        all_permissions.extend(account_perms)
+
+    # Get all equity-eligible users
+    equity_users = await get_all_equity_eligible_users()
+
+    # Collect unique user IDs
+    user_ids = set()
+
+    # Add users with accounts
+    for acc in user_accounts:
+        user_ids.add(acc.user_id)
+
+    # Add users with permissions
+    for perm in all_permissions:
+        user_ids.add(perm.user_id)
+
+    # Add equity-eligible users
+    for equity in equity_users:
+        user_ids.add(equity.user_id)
+
+    # Build user list with enriched data
+    users = []
+    for user_id in user_ids:
+        # Get user details from core
+        user = await get_user(user_id)
+
+        # Use username if available, otherwise use user_id
+        username = user.username if user and user.username else None
+
+        # Get user's wallet setting if exists
+        user_wallet = await get_user_wallet(user_id)
+
+        users.append({
+            "id": user_id,
+            "user_id": user_id,  # Compatibility with existing code
+            "username": username,
+            "user_wallet_id": user_wallet.user_wallet_id if user_wallet else None,
+        })
+
+    # Sort by username (None values last)
+    users.sort(key=lambda x: (x["username"] is None, x["username"] or "", x["user_id"]))
+
+    return users
+
+
 @castle_api_router.get("/api/v1/user/wallet")
 async def api_get_user_wallet(
     user: User = Depends(check_user_exists),