admin UI: add anonymous user creation checkbox (#8773)

Add an "Anonymous" checkbox next to the username field in the Create User
modal. When checked, the username is set to "anonymous" and the credential
generation checkbox is disabled since anonymous users do not need keys.

The checkbox is only shown when no anonymous user exists yet. The
manage-access-keys button in the users table is hidden for the anonymous
user.

weed/admin/dash/admin_data.go

@@ -48,10 +48,11 @@ type ObjectStoreUser struct {
 }
 
 type ObjectStoreUsersData struct {
-	Username    string            `json:"username"`
-	Users       []ObjectStoreUser `json:"users"`
-	TotalUsers  int               `json:"total_users"`
-	LastUpdated time.Time         `json:"last_updated"`
+	Username         string            `json:"username"`
+	Users            []ObjectStoreUser `json:"users"`
+	TotalUsers       int               `json:"total_users"`
+	HasAnonymousUser bool              `json:"has_anonymous_user"`
+	LastUpdated      time.Time         `json:"last_updated"`
 }
 
 // User management request structures

weed/admin/handlers/user_handlers.go

@@ -311,10 +311,19 @@ func (h *UserHandlers) getObjectStoreUsersData(r *http.Request) dash.ObjectStore
 		}
 	}
 
+	hasAnonymous := false
+	for _, u := range users {
+		if u.Username == "anonymous" {
+			hasAnonymous = true
+			break
+		}
+	}
+
 	return dash.ObjectStoreUsersData{
-		Username:    username,
-		Users:       users,
-		TotalUsers:  len(users),
-		LastUpdated: time.Now(),
+		Username:         username,
+		Users:            users,
+		TotalUsers:       len(users),
+		HasAnonymousUser: hasAnonymous,
+		LastUpdated:      time.Now(),
 	}
 }

weed/admin/view/app/object_store_users.templ

@@ -141,10 +141,12 @@ templ ObjectStoreUsers(data dash.ObjectStoreUsersData) {
                                                             data-action="edit-user" data-username={ user.Username }>
                                                         <i class="fas fa-edit"></i>
                                                     </button>
-                                                    <button type="button" class="btn btn-outline-secondary" 
-                                                            data-action="manage-access-keys" data-username={ user.Username }>
-                                                        <i class="fas fa-key"></i>
-                                                    </button>
+                                                    if user.Username != "anonymous" {
+                                                        <button type="button" class="btn btn-outline-secondary"
+                                                                data-action="manage-access-keys" data-username={ user.Username }>
+                                                            <i class="fas fa-key"></i>
+                                                        </button>
+                                                    }
                                                     <button type="button" class="btn btn-outline-danger" 
                                                             data-action="delete-user" data-username={ user.Username }>
                                                         <i class="fas fa-trash"></i>
@@ -197,7 +199,17 @@ templ ObjectStoreUsers(data dash.ObjectStoreUsersData) {
                     <form id="createUserForm">
                         <div class="mb-3">
                             <label for="username" class="form-label">Username *</label>
-                            <input type="text" class="form-control" id="username" name="username" required>
+                            if !data.HasAnonymousUser {
+                                <div class="input-group">
+                                    <input type="text" class="form-control" id="username" name="username" required>
+                                    <div class="input-group-text">
+                                        <input class="form-check-input mt-0 me-1" type="checkbox" id="anonymousCheck" onchange="toggleAnonymousUser()">
+                                        <label class="form-check-label small" for="anonymousCheck">Anonymous</label>
+                                    </div>
+                                </div>
+                            } else {
+                                <input type="text" class="form-control" id="username" name="username" required>
+                            }
                         </div>
                         <div class="mb-3">
                             <label for="email" class="form-label">Email</label>
@@ -669,6 +681,24 @@ templ ObjectStoreUsers(data dash.ObjectStoreUsersData) {
             }
         }
 
+        // Toggle anonymous user checkbox
+        function toggleAnonymousUser() {
+            const checkbox = document.getElementById('anonymousCheck');
+            const usernameInput = document.getElementById('username');
+            const generateKey = document.getElementById('generateKey');
+            if (checkbox.checked) {
+                usernameInput.value = 'anonymous';
+                usernameInput.readOnly = true;
+                generateKey.checked = false;
+                generateKey.disabled = true;
+            } else {
+                usernameInput.value = '';
+                usernameInput.readOnly = false;
+                generateKey.disabled = false;
+                generateKey.checked = true;
+            }
+        }
+
         // Populate bucket selection dropdowns
         function populateBucketSelections() {
             const createSelect = document.getElementById('selectedBuckets');
@@ -1055,6 +1085,8 @@ templ ObjectStoreUsers(data dash.ObjectStoreUsersData) {
                     const modal = bootstrap.Modal.getInstance(document.getElementById('createUserModal'));
                     modal.hide();
                     form.reset();
+                    document.getElementById('username').readOnly = false;
+                    document.getElementById('generateKey').disabled = false;
                     setTimeout(() => window.location.reload(), 1000);
                 } else {
                     const error = await response.json();